U.S. patent number RE36,807 [Application Number 08/829,792] was granted by the patent office on 2000-08-08 for axle driving apparatus.
This patent grant is currently assigned to Kanzaki Kokyukoki Mfg. Co., Ltd.. Invention is credited to Hideaki Okada.
United States Patent |
RE36,807 |
Okada |
August 8, 2000 |
**Please see images for:
( Certificate of Correction ) ** |
Axle driving apparatus
Abstract
In order that a hydraulic pump and a hydraulic motor of a
hydrostatic transmission hitherto disposed to the exterior are
attached to a hydrostatic transmission support member provided in a
mission case, a charging pump hitherto attached to the hydraulic
pump at the hydrostatic transmission is also attached to the
hydrostatic transmission support member, and an oil filter hitherto
attached to the outside of mission case is disposed therein, they
are interposed between the lower surface of hydrostatic
transmission support member and the charging pump. Furthermore, an
outward takeout pump also is supported in the mission case.
Inventors: |
Okada; Hideaki (Takarazuka,
JP) |
Assignee: |
Kanzaki Kokyukoki Mfg. Co.,
Ltd. (Amagasaki, JP)
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Family
ID: |
27316426 |
Appl.
No.: |
08/829,792 |
Filed: |
April 30, 1997 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
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092685 |
Jul 16, 1993 |
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Reissue of: |
413763 |
Sep 28, 1989 |
05031403 |
Jul 16, 1991 |
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Foreign Application Priority Data
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Oct 7, 1988 [JP] |
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63-132060 U |
Oct 14, 1988 [JP] |
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63-134701 U |
Oct 14, 1988 [JP] |
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63-134702 U |
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Current U.S.
Class: |
60/454; 60/486;
60/487; 60/488 |
Current CPC
Class: |
B60K
17/105 (20130101); B60K 17/14 (20130101); Y10T
74/2186 (20150115) |
Current International
Class: |
F16D
31/02 (20060101); F16D 031/02 () |
Field of
Search: |
;60/454,464,485,487,488,486 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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10698 |
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Mar 1974 |
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JP |
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27345 |
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Jun 1977 |
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JP |
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8735 |
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Feb 1981 |
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JP |
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51351 |
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Apr 1985 |
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JP |
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48661 |
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Mar 1986 |
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JP |
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134433 |
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Aug 1986 |
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JP |
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16630 |
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Apr 1988 |
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JP |
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1126363 |
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Sep 1968 |
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GB |
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Other References
Eaton Hydraulics Division, Repair Information, Hydrostatic
Transaxle Series 850, copyrighted 1987..
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Primary Examiner: Lopez; F. Daniel
Attorney, Agent or Firm: Sterne, Kessler, Goldstein &
Fox PLLC
Parent Case Text
.Iadd.This reissue application is a continuation of reissue
application Ser. No. 08/092,685, filed Jul. 16, 1993, now
abandoned, and a reissue of application Ser. No. 07/413,763, filed
Sep. 28, 1989 (U.S. Pat. No. 5,031,403). .Iaddend.
Claims
What is claimed is:
1. An axle driving apparatus comprising,
a transmission case;
an L-shaped transmission support member housed within said
transmission case;
a hydraulic pump mounted on said support member and communicating
with an engine;
a hydraulic motor mounted on said support member and communicating
with an axle;
a charging pump disposed on said support member, and driven by said
hydraulic pump, said charging pump including a charging pump
discharge oil passage in communication with a suction port provided
in said support member, and a charging pump suction oil passage;
and
an oil filter covering said charging pump suction oil passage.
2. The axle driving apparatus of claim 1 wherein said hydraulic
pump is mounted to a horizontal surface of said L-shaped
transmission support member.
3. The axle driving apparatus of claim 1 wherein said hydraulic
motor is mounted to a vertical surface of said L-shaped
transmission support member.
4. The axle driving apparatus of claim 1 wherein said charging pump
is disposed on a lower horizontal surface of said transmission
support member.
5. The axle driving apparatus of claim 1 further comprising,
a pair of check valves disposed within said support member
.[.fluid.]. in a closed fluid circuit provided within said
transmission support member.
6. The axle driving apparatus of claim 1, further comprising,
an outward takeout pump driven by said hydraulic pump disposed
within said transmission case;
a takeout pump suction oil passage provided in said takeout pump in
communication with said charging pump suction oil passage;
a takeout pump discharge oil passage provided in said takeout pump,
in communication with an outward takeout port on said transmission
case;
wherein said oil filter covers said charging pump suction oil
passage and said takeout pump suction oil passage.
7. The axle driving apparatus of claim 6 wherein said outward
takeout pump is disposed on a inner bottom surface of said
transmission case.
8. The axle driving apparatus of claim 1, further comprising,
an outward takeout pump driven by said hydraulic pump;
a charging pump case for receiving said charging pump, fixed to
said support member;
an outward takeout pump case for receiving said outward takeout
pump, attached to said charging pump case;
a takeout pump suction oil passage disposed within said outward
takeout pump and in communication with said charging pump suction
oil passage;
wherein said oil filter covers said takeout pump suction oil
passage and said charging pump suction oil passage; and
a takeout pump discharge oil passage disposed within said outward
takeout pump and in communication with an outward takeout port on a
surface of said transmission case.
9. The axle driving apparatus of claim 8 wherein said charging pump
suction oil passage is open at a lower surface of said
.[.changing.]. .Iadd.charging .Iaddend.pump case and is covered by
said oil filter.
10. An axle driving apparatus comprising,
a transmission case;
an L-shaped transmission support member housed within said
transmission case;
a hydraulic pump mounted on said support member and communicating
with an engine;
a hydraulic motor mounted on said support member and communicating
with an axle;
a charging pump disposed on an inner surface of said transmission
case, and driven by said hydraulic pump, said charging pump
including a charging pump discharge oil passage in communication
with a suction port provided in said support member, and a charging
pump suction oil passage; and
an oil filter covering said charging pump suction oil passage.
11. The axle driving apparatus of claim 10 wherein said hydraulic
pump is mounted to a horizontal surface of said L-shaped
transmission support member.
12. The axle driving apparatus of claim 10 wherein said hydraulic
motor is mounted to a vertical surface of said L-shaped
transmission support member.
13. The axle driving apparatus of claim 10 wherein said charging
pump is disposed on a lower surface of said transmission case.
14. The axle driving apparatus of claim 10 further comprising,
a pair of check valves disposed within said support member in a
closed fluid circuit provided within said transmission support
member.
15. The axle driving apparatus of claim 10 further comprising,
an outward takeout pump case disposed within said transmission
case;
a charging pump case for receiving said charging pump fixed to said
outward takeout pump case;
an outward takeout pump disposed within said outward takeout pump
case, driven by said hydraulic pump and having a takeout pump
suction oil passage and a takeout pump discharge oil passage,
wherein said takeout pump suction oil passage is open at a lower
surface of said charging pump case and is covered by said oil
filter, and wherein said takeout pump suction oil passage is in
communication with said charging pump suction oil passage; and
an outward takeout port provided on said transmission case and
connected to said takeout pump discharge oil passage. .Iadd.
16. An axle driving apparatus, comprising:
a transmission case;
an axle disposed within said transmission case;
a transmission support housed within said transmission case and
having a generally horizontal surface;
a suction port provided in said transmission support;
a hydraulic motor having a hydraulic motor shaft, said hydraulic
motor mounted on said transmission support and communicating with
said axle;
a hydraulic pump having a hydraulic pump shaft, said hydraulic pump
communicating with an engine and mounted to said generally
horizontal
surface of said transmission support so that said hydraulic pump
shaft is disposed substantially perpendicular to said hydraulic
motor shaft; and
a charging pump driven by said hydraulic pump shaft for supplying
oil to said suction port. .Iaddend..Iadd.17. The axle driving
apparatus of claim 16, wherein said transmission support further
comprises a generally vertical surface. .Iaddend..Iadd.18. The axle
driving apparatus of claim 17, wherein said hydraulic motor is
mounted to said generally vertical
surface of said transmission support. .Iaddend..Iadd.19. The axle
driving apparatus of claim 16, wherein said charging pump is
mounted on said transmission support. .Iaddend..Iadd.20. The axle
driving apparatus of claim 16, wherein said charging pump is
mounted to said transmission case. .Iaddend..Iadd.21. The axle
driving apparatus of claim 20, further comprising:
a charging pump discharge oil passage provided in said charging
pump; and
means disposed within said transmission case for connecting said
charging pump discharge oil passage to said suction port.
.Iaddend..Iadd.22. The axle driving apparatus of claim 16, further
comprising:
an outward takeout pump disposed within said transmission case and
driven by said hydraulic pump shaft;
an outward takeout port disposed within said transmission case;
and
an outward takeout pump discharge oil passage provided within said
outward takeout pump and in fluid communication with said outward
takeout port. .Iaddend..Iadd.23. The axle driving apparatus of
claim 22, wherein said outward takeout pump is disposed on an inner
bottom surface of said transmission case. .Iaddend..Iadd.24. The
axle driving apparatus of claim 22, further comprising:
a charging pump case fixed to said transmission support for
receiving said charging pump;
an outward takeout pump case attached to said charging pump case
for receiving said outward takeout pump; and
means disposed within said transmission case for connecting said
outward takeout pump discharge oil passage to said outward takeout
port.
.Iaddend..Iadd.25. An axle driving apparatus, comprising:
a transmission case;
an axle disposed within said transmission case;
a transmission support housed within said transmission case and
having a generally horizontal surface;
a suction port provided in said transmission support;
a hydraulic motor having a hydraulic motor shaft, said hydraulic
motor mounted on said transmission support and communicating with
said axle;
a hydraulic pump having a hydraulic pump shaft, said hydraulic pump
communicating with an engine and mounted to said generally
horizontal surface of said transmission support so that said
hydraulic pump shaft is disposed substantially perpendicular to
said hydraulic motor shaft; and
a charging pump disposed within said transmission case and driven
by said hydraulic pump shaft for supplying oil to said suction
port. .Iaddend..Iadd.26. The axle driving apparatus of claim 25,
wherein said transmission support further comprises:
a generally vertical surface, and wherein said hydraulic motor is
mounted
to said generally vertical surface. .Iaddend..Iadd.27. The axle
driving apparatus of claim 25, further comprising:
an oil sump formed between an inner surface of said transmission
case and a surface of said transmission support which is opposite
to said generally horizontal surface, wherein said charging pump is
disposed within said oil sump. .Iaddend..Iadd.28. The axle driving
apparatus of claim 27, further comprising:
a charging pump case attached to said surface of said transmission
support which is opposite to said generally horizontal surface for
receiving said charging pump; and
a charging pump discharge oil passage provided within said charging
pump, wherein said suction port is open at said surface of said
transmission support which is opposite to said generally horizontal
surface and is in fluid communication with said charging pump
discharge oil passage. .Iaddend..Iadd.29. The axle driving
apparatus of claim 27, further comprising:
a charging pump case attached to an inner surface of said
transmission case for receiving said charging pump;
a charging pump discharge oil passage provided at said charging
pump case; and
means for connecting said charging pump discharge oil passage to
said
suction port. .Iaddend..Iadd.30. The axle driving apparatus of
claim 25, further comprising:
an outward takeout pump case attached to an inner surface of said
transmission case;
a charging pump case attached to said outward takeout pump case for
receiving said charging pump;
an outward takeout pump disposed within said outward takeout pump
case, said outward takeout pump including an outward takeout pump
discharge oil passage; and
an outward takeout port disposed within said transmission case and
in fluid communication with said outward takeout pump discharge oil
passage.
.Iaddend..Iadd.31. An axle driving apparatus, comprising:
a transmission case;
an oil sump formed with said transmission case;
an axle disposed within said transmission case;
a hydraulic transmission disposed within said transmission case for
driving said axle, said hydraulic transmission including an input
shaft substantially vertically supported within said transmission
case, and a transmission support housed within said transmission
case;
a charging pump disposed within said oil sump, said charging pump
driven by said input shaft and including a charging pump suction
oil passage for supplying oil to said hydraulic transmission;
and
an oil filter disposed within said oil sump and in fluid
communication with said charging pump suction oil passage.
.Iaddend..Iadd.32. The axle driving apparatus of claim 31, further
comprising:
a charging pump case mounted to an inner surface of said
transmission case for receiving said charging pump, wherein said
oil filter is disposed between said transmission support and said
charging pump case.
.Iaddend..Iadd.33. The axle driving apparatus of claim 31, further
comprising:
a charging pump case mounted on said transmission support for
receiving said charging pump, wherein said oil filter is disposed
between said charging pump case and an inner surface of said
transmission case. .Iaddend..Iadd.34. The axle driving apparatus of
claim 31, wherein said charging pump is mounted on said
transmission support and said oil filter is disposed between said
transmission support and an inner surface of said
transmission case. .Iaddend..Iadd.35. An axle driving apparatus,
comprising:
a transmission case;
a transmission support housed within said transmission case, said
transmission support having a hydraulic pump mounting surface, a
hydraulic motor mounting surface substantially perpendicular to
said pump mounting surface, and a charging pump mounting surface
separate from and substantially parallel to said hydraulic pump
mounting surface;
a hydraulic pump having a hydraulic pump shaft and mounted to said
hydraulic pump mounting surface;
a hydraulic motor having a hydraulic motor shaft and mounted to
said hydraulic motor mounting surface so that said hydraulic motor
shaft is disposed perpendicular to said hydraulic pump shaft;
a charging pump mounted to said charging pump mounting surface and
driven by hydraulic pump shaft. .Iaddend..Iadd.36. The axle driving
apparatus of claim 35, wherein said transmission support is
substantially L-shaped, having a generally horizontal portion which
includes said hydraulic pump mounting surface and said charging
pump mounting surface and a generally vertical portion which
includes said hydraulic motor mounting surface. .Iaddend..Iadd.37.
The axle driving apparatus of claim 36, wherein said hydraulic pump
mounting surface is formed on an upper surface of said generally
horizontal portion and said charging pump mounting surface is
formed on a lower surface of said generally horizontal portion.
.Iaddend..Iadd.38. The axle driving apparatus of claim 37, further
comprising:
an oil sump formed between said lower surface and an inner bottom
surface of said transmission case;
an oil filter disposed within said oil sump;
wherein said charging pump is disposed within said oil sump and
includes a charging pump suction oil passage which is open to said
oil sump and in
fluid communication with said oil filter. .Iaddend..Iadd.39. The
axle driving apparatus of claim 38, wherein said oil filter is
disposed between said charging pump and said inner bottom surface
of said transmission case. .Iaddend..Iadd.40. The axle driving
apparatus of claim 38, wherein said oil filter is disposed between
said transmission support and said inner bottom surface of said
transmission case. .Iaddend..Iadd.41. The axle driving apparatus of
claim 37, further comprising:
a suction port open at said lower surface; and
wherein said charging pump is disposed within said oil sump and
includes a charging pump discharge oil passage in fluid
communication with said suction port. .Iaddend..Iadd.42. An axle
driving apparatus, comprising:
a transmission case comprising two case elements joined along a
generally horizontal mating surface;
a hydraulic pump including a hydraulic pump shaft;
a hydraulic motor including a hydraulic motor shaft;
a closed fluid circuit connecting said hydraulic pump and said
hydraulic motor;
a charging pump driven by said hydraulic pump shaft for supplying
oil to said closed fluid circuit;
a transmission support having a generally horizontal portion and a
generally vertical portion perpendicular to said horizontal
portion, said horizontal portion disposed along said mating surface
within one of said case elements;
a hydraulic pump mounting surface for mounting said hydraulic pump
within said transmission case, said hydraulic pump mounting surface
provided on one side of said horizontal portion of said
transmission support;
a charging pump mounting surface for mounting said charging pump
within said transmission case, said charging pump mounting surface
provided on a side of said horizontal portion of said transmission
support opposite to said one side; and
a hydraulic motor mounting surface for mounting said hydraulic
motor within said transmission case, said hydraulic motor mounting
surface provided at
said vertical portion of said transmission support.
.Iaddend..Iadd.43. The axle driving apparatus of claim 42, further
comprising:
an oil sump formed between said transmission support and one of
said case elements;
an oil filter disposed within said oil sump;
wherein said charging pump includes a charging pump suction oil
passage open to said oil sump and in fluid communication with said
oil filter.
.Iaddend..Iadd.44. The axle driving apparatus of claim 43, wherein
said oil filter is disposed between said charging pump mounting
surface and an inner surface of said one of said case elements.
.Iaddend..Iadd.45. The axle driving apparatus of claim 43, further
comprising:
a charging pump case for receiving said charging pump, wherein said
oil filter is disposed between said charging pump case and an inner
surface of
said one of said case elements. .Iaddend..Iadd.46. An axle driving
apparatus, comprising:
a transmission case;
an axle disposed within said transmission case;
a hydraulic transmission disposed within said transmission case,
said hydraulic transmission including a substantially vertical
input shaft and a substantially horizontal output shaft operatively
connected to said axle;
a charging pump driven by said input shaft for supplying oil to
said hydraulic transmission;
a common oil sump formed within said transmission case common to
said charging pump and said axle; and
a charging pump case for receiving therein said charging pump, said
charging pump case disposed within said common oil sump.
.Iaddend..Iadd. The axle driving apparatus of claim 46, further
comprising a transmission support housed within said transmission
case, wherein said charging pump case is attached to a lower
surface of said transmission support. .Iaddend..Iadd.48. The axle
driving apparatus of claim 47, wherein said charging pump is
disposed on a lower end of said
input shaft. .Iaddend..Iadd.49. The axle driving apparatus of claim
46, wherein said charging pump case is attached to an inner bottom
surface of said transmission case. .Iaddend..Iadd.50. The axle
driving apparatus of claim 49, wherein said charging pump is
disposed on a lower end of said input shaft. .Iaddend..Iadd.51. An
axle driving apparatus, comprising:
a transmission case having an upper casing and a lower casing;
a pair of axles disposed within said transmission case;
a differential gear for connecting said pair of axles to each
other, said differential gear disposed within said transmission
casing;
a hydraulic transmission disposed within said transmission case,
said hydraulic transmission including a substantially vertical
input shaft and a substantially horizontal output shaft connected
to said differential gear;
a charging pump driven by said input shaft for supplying oil to
said hydraulic transmission; and
a common oil sump formed within said transmission case common to
said charging pump and said pair of axles, wherein said charging
pump is disposed within said common oil sump. .Iaddend..Iadd.52.
The axle driving apparatus of claim 51, wherein said output shaft
is supported between said
upper casing and said lower casing. .Iaddend..Iadd.53. The axle
driving apparatus of claim 51, wherein said pair of axles is
supported between said upper casing and said lower casing.
.Iaddend..Iadd.54. An axle driving apparatus, comprising:
a transmission case having an upper casing and a lower casing;
a pair axles disposed within said transmission case;
a differential gear for connecting said pair of axles to each
other, said differential gear disposed within said transmission
case;
a hydraulic transmission disposed within said transmission case,
said hydraulic transmission including a substantially vertical
input shaft and a substantially horizontal output shaft operatively
connected to said pair of axles;
a charging pump driven by said input shaft for supplying oil to
said hydraulic transmission;
a common oil sump formed within said transmission case common to
said charging pump and said pair of axles; and
a charging pump case for receiving therein said charging pump, said
charging pump case disposed within said common oil sump.
.Iaddend..Iadd.55. The axle driving apparatus of claim 54, further
comprising a transmission support housed within said transmission
case, wherein said charging pump case is attached to a lower
surface of said
transmission support. .Iaddend..Iadd.56. The axle driving apparatus
of claim 55, wherein said charging pump is disposed on a lower end
of said input shaft. .Iaddend..Iadd.57. The axle driving apparatus
of claim 54, wherein said charging pump case is attached to an
inner bottom surface of said lower casing. .Iaddend..Iadd.58. The
axle driving apparatus of claim 57, wherein said charging pump is
disposed on a lower end of said input shaft. .Iaddend..Iadd.59. The
axle driving apparatus of claim 54, wherein said output shaft is
supported between said upper casing and said lower casing.
.Iaddend..Iadd.60. The axle driving apparatus of claim 54, wherein
said pair of axles is supported between said upper casing and said
lower
casing. .Iaddend..Iadd.61. An axle driving apparatus,
comprising:
a transmission case;
an axle disposed within said transmission case;
a hydraulic transmission disposed within said transmission case for
driving said axle, said hydraulic transmission including an input
shaft substantially vertically supported within said transmission
case;
a takeout pump driven by said input shaft;
a common oil sump formed within said transmission case common to
said takeout pump and said axle;
a takeout pump case for receiving therein said takeout pump, said
take out pump case disposed within said common oil sump; and
an actuator external to said transmission case in fluid
communication with said takeout pump, wherein said takeout pump
supplies operating oil for said actuator from said common oil sump.
.Iaddend..Iadd.62. The axle driving apparatus of claim 61, wherein
said takeout pump case is mounted to an inner surface of said
transmission case. .Iaddend..Iadd.63. The axle driving apparatus of
claim 62, wherein said takeout pump is disposed on an end of said
input shaft. .Iaddend..Iadd.64. The axle driving apparatus of claim
61, further comprising:
a transmission supported housed within said transmission case,
wherein said takeout pump case is mounted on a surface of said
transmission support.
.Iaddend..Iadd.65. An axle driving apparatus, comprising:
a transmission case;
an axle disposed within said transmission case;
a hydraulic transmission disposed within said transmission for
driving said axle, said hydraulic transmission including an input
shaft substantially vertically supported within said transmission
case;
a takeout pump driven by said input shaft;
a common oil sump formed within said transmission case common to
said takeout pump and said axle, said takeout pump disposed within
said common oil sump;
an actuator external to said transmission case;
an outward takeout port disposed within said transmission case in
fluid communication with said actuator, wherein said takeout pump
supplies operating oil for said actuator from said outward takeout
port; and
a return pipe connected to said transmission case for returning
takeout oil from said actuator into said transmission case.
.Iaddend..Iadd.66. The axle driving apparatus of claim 65, wherein
said outward takeout port is open at a lower surface of said
transmission case. .Iaddend..Iadd.67. The axle driving apparatus of
claim 65, wherein said return pipe is in fluid
communication with said oil sump. .Iaddend..Iadd.68. The axle
driving apparatus of claim 67, wherein said return pipe is open at
a bottom of said transmission case. .Iaddend..Iadd.69. The axle
driving apparatus of claim 65, further comprising:
a takeout pump case for receiving therein said takeout pump,
wherein said takeout pump case is mounted to an inner surface of
said transmission case. .Iaddend..Iadd.70. The axle driving
apparatus of claim 65, wherein said takeout pump is disposed on an
end of said input shaft. .Iaddend..Iadd.71. The axle driving
apparatus of claim 65, further comprising:
a takeout pump case for receiving therein said takeout pump;
a transmission support housed within said transmission case,
wherein said takeout pump case is mounted on a surface of said
transmission support.
.Iaddend..Iadd.72. An axle driving apparatus, comprising:
a transmission case;
an axle disposed within said transmission case;
a hydraulic transmission disposed within said transmission case for
driving said axle, said hydraulic transmission including an input
shaft substantially vertically supported within said transmission
case;
a charging pump driven by said input shaft;
a common oil sump formed within said transmission case common to
said charging pump and said axle;
a charging pump case for receiving therein said charging pump, said
charging pump case disposed within said common oil sump;
a takeout pump driven by said input shaft;
a takeout pump case for receiving therein said takeout pump, said
takeout pump case disposed within said common oil sump; and
an actuator external to said transmission case in fluid
communication with said takeout pump, wherein said charging pump
and said takeout pump suck up oil within said common oil sump, said
charging pump supplying operating oil for said hydraulic
transmission, and said takeout pump supplying operating oil for
said actuator. .Iaddend..Iadd.73. The axle driving apparatus of
claim 72, further comprising:
a transmission support housed within said transmission case,
wherein said charging pump case and said takeout pump case are
disposed between said transmission support and said transmission
case. .Iaddend..Iadd.74. The axle driving apparatus of claim 73,
wherein said takeout pump case is mounted to said transmission case
and said charging pump case is mounted to said transmission
support. .Iaddend..Iadd.75. The axle driving apparatus of claim 73,
wherein said takeout pump case and said charging pump case are
disposed along the longitudinal axis of said input shaft and are
joined to said transmission support. .Iaddend..Iadd.76. The axle
driving apparatus of claim 72, wherein said takeout pump case and
said charging pump case are disposed along the longitudinal axis of
said input
shaft and are joined to said transmission case. .Iaddend..Iadd.77.
An axle driving apparatus, comprising:
a transmission case;
an axle disposed within said transmission case;
a hydraulic transmission disposed within said transmission case,
said hydraulic transmission including a substantially vertical
input shaft and a substantially horizontal output shaft operatively
connected to said axle;
a charging pump driven by said input shaft for supplying oil to
said hydraulic transmission;
a common oil sump formed within said transmission case common to
said charging pump and said axle;
a charging pump case for receiving therein said charging pump, said
charging pump case is attached to a bottom surface of said
transmission case; and
an oil passage for supplying discharged oil from said charging pump
to said hydraulic transmission, said oil passage is disposed within
said common
oil sump. .Iaddend..Iadd.78. An axle driving apparatus,
comprising:
a transmission case having an upper casing and a lower casing;
a pair of axles disposed within said transmission case;
a differential gear for connecting said pair of axles to each
other, said differential gear disposed within said transmission
case;
a hydraulic transmission disposed within said transmission case,
said hydraulic transmission including a substantially vertical
input shaft and a substantially horizontal output shaft operatively
connected to said pair of axles;
a charging pump driven by said input shaft for supplying oil to
said hydraulic transmission;
a common oil sump formed within said transmission case common to
said charging pump and said pair of axles;
a charging pump case for receiving therein said charging pump, said
charging pump case is attached to a bottom surface of said
transmission case; and
an oil passage for supplying discharged oil from said charging pump
to said hydraulic transmission, said oil passage is disposed within
said common oil sump. .Iaddend..Iadd.79. An axle driving apparatus,
comprising:
a transmission case;
an axle disposed within said transmission case;
a hydraulic transmission disposed within said transmission case for
driving said axle, said hydraulic transmission including an input
shaft substantially vertically supported within said transmission
case;
a charging pump driven by said input shaft;
a common oil sump formed within said transmission case common to
said charging pump and said axle;
a charging pump case for receiving therein said charging pump;
a takeout pump driven by said input shaft;
a takeout pump case for receiving therein said takeout pump,
wherein said charging pump case and said takeout pump case are
along the longitudinal axis of said input shaft and are joined to a
bottom surface of said transmission case; and
an oil passage for supplying discharged oil from said charging pump
to said hydraulic transmission, said oil passage is disposed within
said common oil sump. .Iaddend.
Description
FIELD OF THE INVENTION
The present invention relates to an axle driving apparatus housing
therein a hydrostatic-transmission (HST) used as a driving
apparatus for a light running vehicle or the like.
DESCRIPTION OF THE PRIOR ART
Conventionally, for an axle driving apparatus with a
hydrostatic-transmission (HST), the following technique has been
well known as to a hydrostatic transmission support member or a
charging pump:
U.S. Pat. Nos. 4,691,802 and 3,196,696, Japanese Utility Model
Publication No. Sho 52-27345, Japanese Utility Model Laid-Open No.
Sho 61-134433, Japanese Utility Model Publication No. Sho 56-8735,
Japanese Utility Model Laid-Open No. Sho 60-51351, Japanese Patent
Laid-Open No. Sho 61-48661, Japanese Utility Model Publication No.
Sho 49-10698, and Japanese Patent Publication No. Sho 63-16630
disclose the following technique respectively.
SUMMARY OF THE INVENTION
The axle driving apparatus of the present invention attaches to a
hydrostatic transmission support member provided in a transmission
case a hydraulic pump and a hydraulic motor for the hydrostatic
transmission which have hitherto have been disposed outside the
axle driving apparatus; attaches a charging pump to the lower
surface of the hydrostatic transmission support member; and also
disposes an oil filter within the axle driving apparatus, so that
suction oil passages for the charging pump are interposed, in
condition of communicating with each other, under the hydrostatic
transmission support member. Also, an outward takeout pump is
supported within the transmission case.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a sectional front view of an embodiment of an axle
driving apparatus of the invention,
FIG. 2 is a sectional right side view of the same,
FIG. 3 is a plan view of the same, from which an upper transmission
case part 9b is removed,
FIG. 4 is a sectional plan view of a hydrostatic transmission
support member,
FIG. 5 is a sectional view taken on the line 5--5 in FIG. 1,
FIG. 6 is a sectional view taken on the line 6--6 in FIG. 1,
FIG. 7 is a perspective view of an oil filter,
FIG. 8 is a sectional front view in part of a modified embodiment
of the present invention, in which the oil filter is disposed in a
different position,
FIG. 9 is a sectional front view of a second embodiment of the
present invention,
FIG. 10 is a partial sectional front view of another modified
embodiment of the present invention, in which the discharge oil
passage is modified,
FIG. 11 is a sectional plan view of the hydrostatic transmission
support member of FIG. 9,
FIG. 12 is a sectional view of the hydrostatic transmission support
member taken on line 12--12 in FIG. 9,
FIG. 13 is a sectional view taken along line 13--13 in FIG. 9,
FIG. 14 is a sectional front view of a third embodiment of the
present invention,
FIG. 15 is a sectional front of a still further modified embodiment
of the axle driving apparatus in FIG. 14, from which the outward
takeout pump is removed,
FIG. 16 is a sectional front view of a fourth embodiment of the
present invention, and
FIG. 17 is a sectional front view of a embodiment of the present
invention.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Next, one embodiment of the axle driving apparatus of the present
invention will be described in accordance with the accompanying
drawings.
In FIGS. 1, 2 and 3, a hydraulic pump P and a hydraulic motor M for
a hydrostatic transmission in a mission or transmission case 9, a
hydrostatic transmission support member 1 for supporting the
hydraulic pump P and hydraulic motor M, and a charging pump C
attached to the hydrostatic transmission support member 1 are shown
and arrangement thereof will be described.
An upper mission or transmission case 9b and a lower mission or
transmission case 9a are vertically connected by connecting bolts
to form one mission case 9.
At the mating faces of the lower mission case 9a and upper mission
case 9b are formed bearing faces for a hydraulic motor shaft 6, a
countershaft 38 and axles 17L and 17R.
The hydrostatic transmission support member 1, which is preferably
L-shaped, is connected to the mating face of the upper mission case
9b through four bolts B. Between the lower surface of the
hydrostatic transmission support member 1 and the inner bottom
surface of the lower mission case 9a is formed a space A
.Iadd.including an oil sump .Iaddend.for disposing therein a
charging pump C to be discussed below and an outward takeout pump
T. At the upper flat surface of the hydrostatic transmission
support member 1 is fixed an axial piston type hydraulic pump P for
the hydrostatic transmission and at the left side surface of a
rising portion provided at the hydrostatic transmission support
member 1 is fixed a hydraulic motor M of the same type as the
hydraulic pump P. Thus, pump P is disposed perpendicular to Motor
M.
A closed circuit connecting the hydraulic pump P and hydraulic
motor M for the hydrostatic transmission comprises crescent-shaped
oil passages P1 and P2 open at the upper flat surface of
hydrostatic transmission support member 1, and 1e and 1f also of
crescent-shape open at the right side surface of the rising portion
(FIGS. 2 and 4), and two oil passages 1c and 1d communicating with
these passages P1, P2 and 1e, 1f respectively (FIG. 4).
A hydraulic pump shaft .Iadd.or input shaft .Iaddend.29 perforates
the upper mission case 9b so as to upwardly project and a movable
swash plate 28 is disposed between the spherical wall of upper
mission case 9b and the upper surface of hydraulic pump P.
An operational engaging portion projects laterally of the movable
swash plate 28 and engages with a lever arm 10 (FIG. 2).
The lever arm 10 is fixed to a speed-change lever shaft 2 and a
speed-change arm 11 is fixed thereto at the position where the
speed-change lever shaft 2 perforates the upper wall of upper
mission case 9b and projects upwardly therefrom.
The movable swash plate 28 is rotated by the lever arm 10 so as to
change the angle of swash plate 28, thereby changing the discharge
direction and a discharge amount of pressure oil from the hydraulic
pump P.
Also, the lower end of hydraulic pump shaft 29 perforates the
horizontal part of hydrostatic transmission support member 1 to
enter the space A and fixedly supports a pump gear 7 of the
charging pump C attached to the lower surface of hydrostatic
transmission support member 1. Pump P freely rotates on pump shaft
29.
The charging pump C comprises the pump gear 7 covered by a charging
pump case 3 attached to a lower surface of support member 1. Pump
gear 7 rotates to pressurize, as operating oil, lubricating oil
taken into the case 3 through an oil filter 5 .Iadd.from the space
A oil sump .Iaddend.so that the pressurized lubricating oil is
supplied from a charge oil passage 1a to vertical oil passages
1b.
The pump gear 7, as shown in FIG. 6, comprises an internal gear
pump of an internal gear 7b and an external gear 7a, the hydraulic
pump shaft 29 being fixed at the center of external gear 7a. A
crescent shaped shutter 7c within internal gears 7b, and engages
both gears 7a and 7b, creating two non-engaged spaces 7d and 7e.
Lower pressure port 7d communicates with suction oil passage 3a in
order to suck operating oil. Higher pressure port 7e communicates
with charge oil passage 1a of support member 1.
Check valve seats 41 and 42 communicating with the vertical oil
passages 1b respectively are disposed so as to form check valves 8
for supplying pressure oil from the oil passages 1b to the oil
passages 1c and 1d between the hydraulic pump P and the hydraulic
motor M in a closed circuit.
The check valves 8 can be open by oil pressure from the oil
passages 1b, or mechanically as follows: The check valves 8 project
at operating ends from the side surface of hydrostatic transmission
support member 1 and a spring-loaded connecting rod 40 connects and
urges against the projections of the two check valves 8, a push pin
39 for pushing the connecting rod 40 projects outwardly from the
lower mission case 9a.
The push pin is pushed to simultaneously open the check valves 8 so
that the oil passages 1c and 1d communicate with each other through
the vertical oil passages 1b and charge oil passage 1a so as to
short-circuit the closed circuit, thereby stopping rotation of the
hydraulic motor M.
Furthermore, the charging pump C is attached to the lower surface
of hydrostatic transmission support member 1 and between the
charging pump case 3 of charging pump C and the inner surface of
lower mission case 9a is interposed a cylindrical oil filter 5
composed of porous material, such as sponge, as shown in FIG.
7.
In order to simplify fixing the unit, the oil filter 5 is not
tightened by bolts, but is sandwiched between the charging pump
case 3 and the inner surface of the lower mission case 9a.
The hydraulic motor M fixed to the rising portion of hydrostatic
transmission support member 1 obtains torque of the hydraulic motor
shaft .Iadd.or output shaft .Iaddend.6 by allowing pistons of the
motor M to abut against a fixed swash plate 33. An output gear 34
is fixed to an intermediate portion of hydraulic motor shaft 6, and
a braking drum 24 of a brake system is fixed to the outer end of
the same. Motor M freely rotates on motor shaft 6.
As shown in FIG. 3, the output gear 34 fixed to the hydraulic motor
shaft 6 engages with a larger diameter gear 35 on the counter shaft
38 and a smaller diameter gear 37 thereon engages with a ring gear
at a differential gear D.
FIG. 5 is a bottom view of the hydrostatic transmission support
member 1, the charging pump case 3 containing therein the pump gear
7 as in FIG. 6.
Operating oil for the charging pump C comprising the pump gear 7
and charging pump case 3 is taken in by a suction oil passage 3a
open at the lower surface of charging pump case 3, the oil filter
5, composed of cylindrical sponge, is tightly closed around the
suction oil passage 3a.
The pressure oil discharged through the pump gear 7 is guided from
the discharge oil passage 3d to the charge oil passage 1a at the
hydrostatic transmission support member 1.
Then, the pressure oil is sent from the charge oil passage 1a to
inlets of check valves 8 at the check valve seats 41 and 42 through
the vertical oil passages 1b.
Usually, during running, high pressure oil is supplied to the oil
passages P1, 1c and 1e or to P2, 1d and 1f, comprising the closed
circuit between the hydraulic pump P and the hydraulic motor M.
Assuming that the high pressure oil is applied to the oil passages
P1, 1c and 1e, the pressure oil generated by the charging pump C is
lower in oil pressure than the high pressure oil, whereby the check
valve 8 is closed with respect to the check valve seat 41. Hence,
the pressure oil from the charging pump C does not flow to the oil
passages P1, 1c and 1e.
Conversely, when the operating oil in the oil passages P2, 1d and
1f subjected to a decreased in pressure due to leakage from the
hydraulic pump P or the hydraulic motor M and the oil pressure
becomes lower than that of charging pump C, the pressure at the
charging pump C side pushes open the check valve 8 applied with no
pressure, thereby supplying the operating oil into the closed
circuit of oil passages P2, 1d and 1f.
In the modified embodiment in FIG. 8, a small-sized charging pump C
is attached to the bottom surface of hydrostatic transmission
support member 1 and the charging pump case 3 also is small-sized,
so that the cylindrical oil filter 5 is interposed outside the
charging pump case 3 and between the inner bottom surface of lower
mission case 9a and the bottom surface of HST support member 1.
Next, explanation will be given on the second embodiments in FIGS.
9, 10, 11 and 12.
A hydraulic pump shaft 29 perforates the hydrostatic transmission
support member 1 and projects downwardly from the lower surface
thereof, passes through the oil filter 5, perforates a shaft bore
3b at the charging pump case 3 attached to the inner bottom surface
of the lower mission case 9a, and engages rotatably with the
external gear 7a of the pump gear 7.
The pump gear 7, as shown in FIG. 13, comprises an internal
trochoid gear of an internal gear 7b and of an external gear 7a,
the hydraulic pump
shaft 29 being fixed to the center thereof.
The charging pump C comprises the pump gear 7 covered by a charging
pump case 3, so that the pump gear 7 rotates to pressurize, as
operating oil, the lubricating oil taken in from the oil filter 5
through the suction oil passage 3a. Pressurized operating oil is
supplied to the vertical oil passages 1b of the hydrostatic
transmission support member 1.
The check valve seats 41 and 42 are disposed to communicate with
the vertical oil passages 1b so that in the check valve seats 41
and 42 are formed check valves 8 for supplying pressure oil from
the charging pump C to the closed circuit between the hydraulic
pump P and the hydraulic motor M.
The check valves 8 project from one side surface of hydrostatic
transmission support member and the connecting rod 40 connects the
projections of the two left and right check valves 8. The push pin
39 for pushing the connecting rod 40 projects from the lower
mission case 9a.
The push pin 39 is pushed to open both the check valves 8, whereby
the discharge side and return side of the hydraulic pump P
short-circuit to stop the rotation of hydraulic motor M.
At the upper surface of the charging pump case 3 is open the
suction oil passage 3a, around which the oil filter 5 of
cylindrical sponge is disposed.
The operating oil taken in from the suction oil passage 3a is
discharged to part of the discharge oil passage 9d.
The discharge oil passage 9d is recessed in the inner bottom
surface of the lower mission case 9a, and an oil passage 9e is
provided in extension of the discharge oil passage 9d. The oil
passage 9e communicates with a higher pressure port 7e and the
vertical oil passage 3c, which communicates with the discharge oil
passage 3d at a rising portion of the L-like shape of the charging
pump case 3.
The discharge oil passage 3d communicates with vertical oil passage
1b at the hydrostatic transmission support member 1.
Alternatively, the cylindrical and separate oil passage 3d, as
shown in FIG. 9, may be a cylindrical separate passage fitted into
the case, as shown in the modified embodiment of FIG. 10 in which,
the charging pump case 3 is if an L-like shaped and an integral
discharge oil passage 3d is be bored therethrough.
FIG. 11 is a sectional view of the hydrostatic transmission support
member 1, FIG. 12 is a bottom view thereof, and the discharge oil
passage 3d is interposed between the bores of vertical oil passages
1b at the hydrostatic transmission support member 1 and the bores
of vertical oil passage 3c at the charge pump case 3.
The pressure oil discharged from the charging pump C is fed from
the discharge oil passage 3d to inlets of check valves 8 at the
check valve seats 41 and 42 through the vertical oil passages 1b at
the hydrostatic transmission support member.
Next, explanation will be given on the third embodiment in FIG.
14.
The embodiment in FIG. 14 is the same as the former embodiment in
that the charging pump C is attached to the bottom surface of
hydrostatic transmission support member 1, but the hydraulic pump
shaft 29 perforates the charging pump case 3 and projects therefrom
so that at the position where the hydraulic pump shaft 29 projects
from the charging pump case 3 is detachably mounted a takeout pump
T.
The takeout pump shaft 14 is separate from the hydraulic pump shaft
29 so as to be removable when the outward takeout pump T is not
required.
The takeout pump is similar to charging pump C and includes a
takeout pump shaft 14 supported to a bearing provided at the bottom
of the lower mission case 9a and a takeout pump gear 12 for the
outward takeout pump fixed to the pump shaft 14. Takeout pump gear
12, similar to charging pump gear 7, includes an external gear 12a
and an internal gear 12b and a crescent shaped shutter (not shown)
which creates two non-engaged spaces lower pressure port 12 and
higher pressure port 12e. Port 12d communicates with suction oil
passage 4a of outward takeout pump case 4 to suck operating oil in
the mission case 9. Oil filter 5 covers both charging pump suction
oil passage 3a and takeout pump suction oil passage 4a.
The pump gear 7 and a pump gear 12 in the drawing are formed as an
internal gear pump, however, the invention is not limited to such
construction.
A suction oil passage 4a is open at part of an outward takeout pump
case 4, so that the operating oil filtrated and taken in the oil
filter 5 is guided by the suction oil passage 4a into the outward
takeout pump T and, after being high pressurized, the operating oil
is discharged through the discharge pipe 13.
The discharge pipe 13 is charged over in the vertical direction by
a directional control valve V and the operating oil is supplied to
a lift cylinder S .Iadd.or hydraulic actuator .Iaddend.or the like
at a mower R, for example.
Return oil from the directional control valve V and lift cylinder S
is adapted to return into the mission case 9 through a return pipe
15.
In the further modified embodiment in FIG. 15, the outward takeout
pump T attached to the inner bottom surface of lower mission case
9a in FIG. 14 is removed therefrom and only the charging pump C is
attached to the bottom surface of hydrostatic transmission support
member 1.
In FIG. 16, a fourth embodiment is shown in which onto the inner
bottom surface of the lower mission case 9a is attached an outward
takeout pump case 4 for the outward takeout pump T and a charging
pump case 3 further is attached to the upper surface of outward
takeout pump case 4.
In this embodiment, both the outward takeout pump T and charging
pump C (similar to FIG. 9) are fixed to the inner bottom surface of
lower mission case 9a .Iadd.along the longitudinal axis of
hydraulic pumpshaft 29.Iaddend..
In this embodiment, an oil filter 5 is interposed between the
bottom surface of hydrostatic transmission support member 1 and the
upper surface of charging pump case 3. Takeout pump suction oil
passage 4a communicates with charging pump suctional passage 3a.
However, oil filter 5 covers only the charging pump suction oil
passage 3a. Filtered operating oil is sucked to takeout pump
suction oil passage through charging pump suction oil passage 3a.
Higher pressure port 12e opens to the inner bottom surface of the
mission case 9 at outward takeout port 9c.
In FIG. 17, a fifth embodiment is shown in which a charging pump
case 3 of a charging pump C is fixed to the bottom surface of
hydrostatic transmission support member 1 and an outward takeout
pump case 4 of the outward takeout pump T is attached to the lower
surface of the charging pump case 3. .Iadd.In this embodiment, both
the outward takeout pump T and charging pump C are joined to the
hydrostatic transmission support along the longitudinal axis of
hydraulic pump shaft 29. .Iaddend.Pressure oil is discharged from
the outward takeout pump T to a discharge pipe 13 through a
discharge oil passage 4d' and thereafter the return oil returns
into the mission case 9 through a return pipe 15. A separate,
cylindrical passage 4d is inserted into passage 4d' between the
inner bottom surface of mission case 9, and at takeout port 9c.
An oil filter 5 is interposed between the lower surface of the
outward takeout pump case 4 and the inner bottom surface of lower
mission case 9a covering only charging pump suction oil passage 3a.
Filtered operating oil is sucked to oil passage 3a through takeout
pump suction oil passage 4a.
The axle driving apparatus of the present invention constructed
according to the above-mentioned embodiments is advantageous as
follows:
In the space A formed between the hydrostatic transmission support
member and the lower mission case, the hydrostatic transmission
support member serves as a baffle plate, so that, even when the
vehicle body swings, the lubricating oil stays in the space A in a
condition which is difficult to create air bubbles, which can cause
a malfunction, such as cavitation, of the charging pump.
Since the charging pump is immersed in the lubricating oil, the
lubricating oil cleaned by the filter is directly taken into the
charging pump and not through pipings or the like, whereby there is
little likelihood of line resistance and the suction efficiency is
improved.
Also, since oil leaked from the charging pump can be returned
directly to the space A, it is not required that the pump case be
precisely tightly closed, for example, by using an O-ring or the
like, which results in a lower manufacturing cost.
Since the outward takeout pump T can be disposed in the space A by
the aforesaid construction, the axle driving apparatus can be used
to drive external hydraulic instruments. Also, the oil filter is
commonly usable between the charging pump C and outward takeout
pump T, also lowering manufacturing costs.
* * * * *