U.S. patent application number 11/128444 was filed with the patent office on 2006-11-16 for pump system for an automotive engine.
Invention is credited to Wade Weiss.
Application Number | 20060257267 11/128444 |
Document ID | / |
Family ID | 37419277 |
Filed Date | 2006-11-16 |
United States Patent
Application |
20060257267 |
Kind Code |
A1 |
Weiss; Wade |
November 16, 2006 |
Pump system for an automotive engine
Abstract
A pump system, including a pressure pump having a primary drive
shaft with a primary fluid moving element and a secondary drive
shaft with a secondary fluid moving element that enmeshes with the
primary fluid moving element; a first scavenge pump bank driven by
the primary drive shaft and including at least one scavenge pump;
and, a second scavenge pump bank driven by the secondary drive
shaft and including at least one scavenge pump.
Inventors: |
Weiss; Wade; (Plainfield,
IN) |
Correspondence
Address: |
WOODARD, EMHARDT, MORIARTY, MCNETT & HENRY LLP
111 MONUMENT CIRCLE, SUITE 3700
INDIANAPOLIS
IN
46204-5137
US
|
Family ID: |
37419277 |
Appl. No.: |
11/128444 |
Filed: |
May 13, 2005 |
Current U.S.
Class: |
417/199.1 |
Current CPC
Class: |
F04C 2/082 20130101;
F04C 2/126 20130101; F04C 2/18 20130101; F04C 11/005 20130101 |
Class at
Publication: |
417/199.1 |
International
Class: |
F04B 23/08 20060101
F04B023/08 |
Claims
1. A pump system, comprising: a pressure pump having a primary
drive shaft with a primary fluid moving element and a secondary
drive shaft with a secondary fluid moving element that enmeshes
with the primary fluid moving element; a first scavenge pump bank
driven by the primary drive shaft and including at least one
scavenge pump; and, a second scavenge pump bank driven by the
secondary drive shaft and including at least one scavenge pump.
2. The pump system of claim 1 wherein the primary fluid moving
element is a primary spur gear and the secondary fluid moving
element is a secondary spur gear.
3. The pump system of claim 2 wherein the at least one scavenge
pump of said first scavenge pump bank includes a primary drive
rotor and a primary driven rotor.
4. The pump system of claim 3 wherein the at least one scavenge
pump of said second scavenge pump bank includes a first, secondary
drive rotor and a first, secondary driven rotor.
Description
FIELD OF THE INVENTION
[0001] The present invention relates to the field of pumps, and
more specifically, to a pump system for an automotive engine.
BACKGROUND OF THE INVENTION
[0002] Many mechanical engines, and particularly gasoline engines,
require a constant circulation of oil for lubrication and cooling.
One or more pumps, driven by the engine itself, are employed to
move and control the oil flow. Such pumps are subjected to harsh
operating conditions, especially in high performance vehicles such
as race cars. It is desired to provide an improved pumping system
for automotive engines.
SUMMARY OF THE INVENTION
[0003] Generally speaking, there is provided a pump system,
including a pressure pump having a primary drive shaft with a
primary fluid moving element and a secondary drive shaft with a
secondary fluid moving element that enmeshes with the primary fluid
moving element; a first scavenge pump bank driven by the primary
drive shaft and including at least one scavenge pump; and, a second
scavenge pump bank driven by the secondary drive shaft and
including at least one scavenge pump. Each scavenge pump bank has
at least one or numerous scavenge pumps, each scavenge pump in a
pump bank being driven by a common one of the primary drive shaft
or the secondary drive shaft.
[0004] It is an object of the present invention to provide an
improved pump system.
[0005] It is an object of the present invention to provide an
improved pump system for an automotive engine.
[0006] Other objects and advantages of the present invention will
become apparent from the following description of the preferred
embodiment.
BRIEF DESCRIPTION OF THE DRAWINGS
[0007] FIG. 1 is a perspective view of a prior art pump system
10.
[0008] FIG. 2 is a perspective, cross-sectional view of the pump
system 10 of FIG. 1, taken along the line 2-2 and viewed in the
direction of the arrows.
[0009] FIG. 3 is a cross-sectional view of the pump system 10 of
FIG. 1, taken along the line 3-3 and viewed in the direction of the
arrows.
[0010] FIG. 4 is a perspective view of the rotor pair 48/51 of the
pump system 10 of FIG. 1.
[0011] FIG. 5 is a rear, perspective view of a pump system 60 in
accordance with one embodiment of the present invention.
[0012] FIG. 6 is a rear perspective view of the pump system 60 of
FIG. 5, shown without filter 65 and filter manifold 66.
[0013] FIG. 7 is a front perspective view of the pump system 60 of
FIG. 6.
[0014] FIG. 8 is a top view of the pump system 60 of FIG. 6.
[0015] FIG. 9 is a perspective, cross-sectional view of the pump
system 60 of FIG. 8 taken along the lines 9-9 and viewed in the
direction of the arrows.
[0016] FIG. 10 is a perspective, cross-sectional view of the pump
system 60 of FIG. 8 taken along the lines 10-10 and viewed in the
direction of the arrows.
[0017] FIG. 11 is a perspective, cross-sectional view of the pump
system 60 of FIG. 8 taken along the lines 11-11 and viewed in the
direction of the arrows.
[0018] FIG. 12 is a perspective, cross-sectional view of the pump
system 60 of FIG. 8 taken along the lines 12-12 and viewed in the
direction of the arrows.
[0019] FIG. 13 is a perspective, cross-sectional view of the pump
system 60 of FIG. 8 taken along the lines 13-13 and viewed in the
direction of the arrows.
[0020] FIG. 14 is a perspective, cross-sectional view of the pump
system 60 of FIG. 12, and showing all of secondary drive shaft 75,
secondary driven shaft 137 and rotors 154 and 155 of second
scavenge pump section 63.
DESCRIPTION OF THE PREFERRED EMBODIMENT
[0021] For the purposes of promoting an understanding of the
principles of the invention, reference will now be made to the
embodiments illustrated in the drawings and specific language will
be used to describe the same. It will nevertheless be understood
that no limitation of the scope of the invention is thereby
intended, and any alterations or modifications in the illustrated
device, and any further applications of the principles of the
invention as illustrated therein are contemplated as would normally
occur to one skilled in the art to which the invention relates.
[0022] Referring now to FIGS. 1-4, there is shown one embodiment of
a prior art pump 10 for moving and controlling the flow of oil in a
high performance engine. Pump 10 includes a pressure pump 11, five
scavenge pumps 12-16, a pressure manifold 17 and a drive pulley 18.
For clarity, pumps 11-16 are shown in FIG. 2 without drive rotors
or gears, which elements are identical to those discussed herein in
relation to the pump system 60 of FIGS. 3-12. Pumps 11-16 are
connected together in a stacked relationship, with mutually
parallel common drive shaft 22 and common idler shaft 23 extending
therethrough, as shown. Drive shaft 22 extends rearwardly of pumps
11-16 and of pressure manifold 17 where it is fixed to and driven
by drive pulley 18. Pressure pump 11 is an external gear pump and
defines a pressure chamber 24, within which are mounted a pair of
enmeshing gears 25 and 26. Gear 25 is a drive gear and is fixed to
rotate with drive shaft 22 via a pair of keyways 27 defined in
drive shaft 22 and matching keyways and keys (indicated at 30).
Gear 26 is an idler gear and is mounted for free rotation on idler
shaft 23 for meshing engagement with drive gear 25. Driven by drive
shaft 22, drive gear 25 and thus idler gear 26 are forced to rotate
within pressure chamber 24 and to pull fluid through suction port
28 and out the pressure port 29 at a desired pressure.
[0023] In like fashion, scavenge pumps 12-16 define scavenge
chambers 31-35, respectively, each of which has a suction port
(38-42) at its bottom portion (that is, below the drive and idler
shafts 22 and 23). At their top portions (that is, above the drive
shaft 22 and idler shaft 23), scavenge chambers 31-35 are in mutual
communication via passageways, such as at 44, and the top portions
of the scavenge chambers 31-35 are thus in mutual communication
with outlets 45 and 46. From pressure pump 11, drive shaft 22 and
idler shaft 23 extend forwardly, in parallel, through the scavenge
chambers 31-35 of scavenge pumps 12-16, respectively. Seals,
bearings and/or wipers are provided at desired points along drive
shaft 22 and idler shaft 23 (for example at 47), to support these
shafts 22 and 23 for rotation and to prevent fluid flow between
chambers, as is known in the art. In each scavenge chamber 31-35, a
helical drive rotor such as 48 (FIG. 4) is fixed to rotate with the
drive shaft 22 via keyways 27 defined in drive shaft 22, keyway 49
defined in rotor 48 and a key (not shown). Also in each scavenge
chamber 31-35, a helical idler rotor 51 is mounted and keyed to
idler shaft 23 and for meshing engagement with the companion drive
rotor 48.
[0024] In operation, drive pulley 18 is rotated by an appropriate
mechanism such as a belt or gear. Rotation of drive pulley 18
rotates drive shaft 22, which rotates drive gear 25 in pressure
chamber 24, which rotates its companion idler gear 26, the drive
gear 25 and idler gear 26 together pumping fluid out of pressure
port 29 and through the engine's systems. Rotation of drive shaft
22 also rotates each drive rotor 48 that is keyed thereto, each of
which thus rotating its companion idler rotor 51. Each set of
rotating, enmeshing drive rotor 48 and idler rotor 51 exerts a
negative pressure to suck fluid in from its corresponding inlet
(38-42) and out of outlets 45 and 46. Inlets 38-42 are connected
via appropriate fluid lines to target fluid recovery points in the
engine, such as the bottom of the oil sump, the valley, the
cylinder heads and/or gear cluster chambers. Outlets 45 and 46 are
connected via appropriate fluid lines (not shown) back to the
engine's oil supply. The pressure manifold 17 contains a pressure
relief valve 52 (not shown) operationally connected with pressure
pump 11 to redirect fluid flow from the outlet side 54 to the inlet
side 55 of pressure pump 11 should the outlet pressure exceed a
predetermined value.
[0025] Referring to FIGS. 5-14, there is shown a pump system 60 in
accordance with one embodiment of the present invention. Pump
system 60 generally includes a pressure pump 61, first and second
scavenge pump sections 62 and 63, a pressure manifold 64, a filter
65, a filter manifold 66 and an end plate 67, all held together by
appropriate means such as bolts 68. Pressure manifold 64 and filter
manifold 66 exist here as separate units, but either or both may be
formed integrally or in other configurations with pressure pump 61.
Pressure pump 61 has a body 69, which defines a pressure chamber 70
(FIG. 9), and further includes enmeshing first spur gear 71 and
second spur gear 72, a primary drive shaft 74 and a secondary drive
shaft 75. From within pressure chamber 70, primary drive shaft 74
extends forwardly into first and second scavenge pump sections 62
and 63 and extends rearwardly, through and out of pressure manifold
64 where it connects with a drive transfer element, such as a
pulley (not shown), to be driven by an appropriate mechanism, such
as a drive belt or gear (not shown). Within pressure chamber 70,
first spur gear 71 is fixed to rotate with primary drive shaft 74
via one or more keyway assemblies (at 76). Also within pressure
chamber 70, second spur gear 72 is fixed to rotate with secondary
drive shaft 75 via one or more keyway assemblies (at 77). Secondary
drive shaft 75 is mounted for otherwise free rotation by
appropriate means such as thrust bearings and for extension from
within pressure chamber 70 and into the scavenge chambers of first
scavenge pump section 62 and second scavenge pump section 63, as
described herein. Pump body 69 has a filter manifold interface
surface 77 (FIG. 6) against which is connected filter manifold 66.
Pump body 69 defines a pressure chamber inlet passageway 78 that
extends from a pressure chamber inlet opening 80 defined in surface
77 to and in communication with pump chamber 70. Pump body 69 also
defines signal orifice 83 and pressure relief inlet and outlet
ports 84 and 85, respectively, that lead to pressure manifold 64.
Pump body 69 also defines a pressure chamber outlet passageway 79
that extends from a pressure chamber outlet opening 81 defined in
surface 77 and in communication with pump chamber 70.
[0026] Referring to FIG. 10, pressure manifold 64 is connected
adjacent the rear side of pump body 69 and which defines outlet
passageway 87, relief valve chamber 88 and relief passageway 89.
Outlet passageway 87 exits pressure manifold 64 (and pump system
60) at pump outlet port 90. As viewed in FIG. 10, relief valve
chamber 88 extends from stop surface 92 to the right where it opens
outwardly of manifold 64 at opening 94. Relief valve chamber 88
slidably receives a relief valve piston 93. Piston 93 includes a
nose 95, a reduced diameter section 97, a piston face 98 and a
spring cavity 99, as shown. Cap 101 defines a spring cavity 102,
and is threadedly received in opening 94 to close off relief valve
chamber 88. In assembly, relief valve piston 93 is received in
chamber 88 with nose 95 up against stop surface 92, and a coil
spring (not shown) is seated to extend in cavities 99 and 102,
between piston 93 and cap 101. Cap 101 is fixed in opening 94, but
alternative embodiments contemplate cap 101 being threadedly
received in opening 94 and being able to be turned in or out to
vary the compressive spring force against piston 93 and thus the
relief pressure threshold of the relief valve 52. Outlet side 54 of
pressure chamber 70 (FIG. 9) is in communication with relief valve
chamber 88 at piston face 98 through pressure chamber outlet
passageway 79 and signal orifice 83. Relief passageway 89 of
manifold 64 is in communication at its top end 103 with relief
valve chamber 88 and at its bottom end 104 with pressure relief
outlet port 85 of pump body 69, which opens into the inlet side 55
of pressure chamber 70, below spur gears 71 and 72. Piston 93 of
pressure relief valve 52 is sized and shaped so that, when seated
in the closed position (FIG. 10), piston face 96 and reduced
diameter section 97 is to the left (as seen in FIG. 10) of relief
passageway 89, thus closing off relief passageway 89 to chamber 88.
In the event of a blockage downstream of orifice 83, increasing
pressure at piston face 98 will act through orifice 83 and against
piston face 98 until the spring force is overcome, whereupon piston
93 is moved to the right (as seen in FIG. 10) until piston face 96
moves to the right enough to permit fluid flow from chamber 88,
through relief passageway 89, and back into the inlet side 55 of
pressure chamber 70.
[0027] Referring to FIGS. 6 and 9, pump body 69 further defines an
outlet passageway 110 that extends from a filter inlet port 111
defined in interface surface 77, through pump body 69 to a similar
outlet passageway 116 defined in pressure manifold 64 (not shown),
which extends rearwardly and exits at pump outlet port 90. Pump
body 69 further defines a pressure relief passageway 112 that
extends from outlet passageway 110 (within pump body 69) to a
pressure relief port 113 defined in interface surface 77.
[0028] Referring to FIGS. 5, 6 and 9, filter manifold 66 connects
to the mutually planar end faces 114, 77 and 115 of pressure
manifold 64, pressure pump 61 and first scavenge pump section 62,
respectively, by appropriate means, such as screws 118. Filter
manifold 66 defines filter inlet passageway 120, filter outlet
passageway 121, filter relief valve passageway 122 and pump inlet
passageway 123. When filter manifold 66 is connected adjacent
interface surface 77 and filter 65 is connected to filter manifold
66, as shown in FIG. 5, the various passageways and ports align to
permit: fluid to flow from an inlet fitting 124 connected at inlet
passageway 123, into pressure chamber inlet passageway 78; fluid to
flow from pressure chamber outlet passageway 79, through filter
inlet passageway 120 and into the inlet (not shown) of filter 65;
and, fluid to flow from the outlet (not shown) of filter 65,
through filter outlet passageway 121 and into pump outlet
passageway 110, where it passes through outlet passageway 116 in
pressure manifold 64 and out pump outlet port 90 to the engine's
systems, as desired.
[0029] Similar to the pressure relief valve 52 of pressure manifold
64, filter manifold 66 is provided with a pressure relief valve,
the relief valve chamber for which is shown at 125. In the event of
a blockage in the filter, increasing fluid pressure acting on the
filter inlet side forces a piston (not shown) to slide within
relief valve chamber 125 and permit fluid to flow from the inlet
side 126 to the outlet side 127 of the relief valve, and thence
through pressure relief port 113, into pressure relief passageway
112 and out through outlet passageway 110.
[0030] In the present embodiment, pump system 60 is designed to
pump oil, and filter 65 is a standard oil filter, such as a Fram
oil filter, model HP4.
[0031] Referring to FIGS. 9 and 11, a cross-section of first
scavenge pump section 62 reveals that pump section 62 includes a
pump body 131, primary and first, secondary drive rotors 132 and
133, primary and secondary driven rotors 134 and 135, and primary
and secondary driven shafts 136 and 137. Scavenge pump body 131
defines first and second scavenge chambers 141 and 142, each of
which has a scavenge inlet 143 and 144, respectively, that are
connected via appropriate fluid lines to target fluid recovery
points in the engine, such as the bottom of the oil sump, the
valley, the cylinder heads and/or gear cluster chambers. Like
rotors 48 and 51 of pump 10 of FIGS. 1-4, rotors 132-135 are
90.degree. helical rotors. Drive rotors 132 and 133 are fixedly
secured to rotate with primary and secondary drive shafts 74 and
75, respectively, which extend from pressure pump 61 into first
scavenge pump section 62. Driven rotors 134 and 135 are fixedly
mounted to rotate with driven shafts 136 and 137, respectively,
which are held for rotation by pump body 131, as shown. Scavenge
chambers 141 and 142 outlet through passageways 147 and 148 to a
common outlet chamber 149, which leads to scavenge pump outlet
fitting 150 (FIG. 13).
[0032] Referring to FIG. 13, stacked next to first scavenge pump
section 62 is second scavenge pump section 63, which includes a
pump body 153, a second, secondary drive rotor 154, a second,
secondary driven rotor 155, and second driven shaft 137, which
extends through from first scavenge pump section 62. Pump body 153
defines a third scavenge chamber 159 which, like scavenge chambers
141 and 142, has a scavenge inlet 160. Pump body 153 further
defines an outlet passageway 161 that leads from third scavenge
chamber 159 to the common outlet chamber 149, which leads to outlet
port 163, to which is connected outlet fitting 150. Like second
chamber 142, the drive rotor 154 of third pressure chamber 159 is
fixedly mounted to secondary drive shaft 75 by appropriate means
such as a keyway assembly 164. The companion driven rotor 155 is
likewise fixedly mounted to driven shaft 137 by appropriate means
such as a keyway assembly 165. In assembly, primary drive shaft 74
extends rearwardly of pump system 60 to connect with and be driven
by a pulley or other appropriate mechanism connected with the
engine, and extends therefrom through pressure manifold 64,
pressure pump 61 and first scavenge pump section 62, and primary
driveshaft 74 is fixedly connected to rotate with first spur gear
71 and primary drive rotor 132. Likewise, secondary drive shaft 75
extends through pressure pump 61, first scavenge pump section 62
and second scavenge pump section 63, and secondary drive shaft 75
is fixedly connected to rotate with second spur gear 72, first,
secondary drive rotor 133, and second, secondary drive rotor 154.
Primary driven shaft 136 extends only within first scavenge pump
section 62 and is fixedly connected to rotate with primary driven
rotor 134. (As described below, shaft 136 does not in this
embodiment extend into another pump section but, along with primary
shaft 74, they do extend out of scavenge chamber 141 to connect
with timing gears 171 and 172). Secondary driven shaft 137 extends
through first scavenge pump section 62 and second scavenge pump
section 63, and first, secondary driven rotor 135 and second,
secondary driven rotor 155 are fixedly connected to rotate
therewith.
[0033] Referring to FIG. 12, a recess 168 is defined in the forward
surface 169 of first scavenge pump section 62 to receive a shaped
drive gear spacer 170. Spacer 170 receives timing gears 171 and
172, which are fixedly connected to and at the rear ends of primary
drive shaft 74 and primary driven shaft 136 by appropriate means
such as keyway assemblies 164. Timing gears 171 and 172 thus rotate
with shafts 74 and 136 and with rotors 132 and 134 and operate to
eliminate momentary drive lag experienced by the independent drive
function of the 90.degree. helical rotors 132 and 134. Similar
timing gears are not necessary with the rotors 133 and 135 of
second scavenge chamber 142 because of the second pair of rotors
154 and 155 connected to rotate therewith in third scavenge chamber
159. That is, rotors 133, 135, 154 and 155 are 90.degree. helical
rotors, and the periodic momentary lag experienced by a single pair
of such rotors is substantially, if not entirely eliminated by
mounting rotors 154 and 155 offset (by about 45.degree.) relative
to rotors 133 and 135.
[0034] As described herein, pump system 60 comprises a pressure
pump 61 and two scavenge pump banks: a primary scavenge pump bank
174 that is driven by primary drive shaft 74 and a secondary
scavenge pump bank 175 that is driven by secondary drive shaft 75.
In the present embodiment, primary scavenge pump bank 174 comprises
only one scavenge pump 178 that is contained substantially within
first scavenge pump section 62, is driven by primary drive shaft 74
and comprises a single pair of rotors 132 and 134. Secondary
scavenge pump bank 175 comprises two scavenge pumps 179 and 180,
both of which are driven by secondary drive shaft 75. Scavenge pump
179 is contained in first scavenge pump section 62 and comprises
first, secondary drive rotor 133 and first, secondary driven rotor
135. Scavenge pump 180 is contained in second scavenge pump section
63 and comprises second, secondary drive rotor 154 and second,
secondary driven rotor 155. Alternative embodiments are
contemplated where either or both of the primary and secondary
scavenge pump banks 174 and 175 each contain as few as one scavenge
pump (such as scavenge pump 178) or two or more scavenge pumps
(such as scavenge pumps 179 and 180), such two or more scavenge
pumps being driven by one of primary drive shaft 74 and secondary
drive shaft 75. Alternative embodiments are also contemplated
wherein one scavenge pump bank (such as scavenge pump bank 175) is
driven by one of primary drive shaft 74 and secondary drive shaft
75, and includes a secondary driven shaft (such as shaft 137) that
then becomes a drive shaft for yet another, separate scavenge pump
bank. In this scavenge pump "branching", timing gears (such as
timing gears 171 and 172) may be employed at appropriate places to
maintain the timing and drive function of the pump banks. Branching
is intended to mean the use of a driven shaft of one scavenge pump
to act as a drive shaft for another scavenge pump, and alternative
embodiments are contemplated where multiple branches are employed
to permit considerable latitude in spatial configuration of the
pump system.
[0035] In operation, primary drive shaft 74 rotates first spur gear
71 which enmeshes with and rotates second spur gear 72 to pump
fluid through inlet 24, out through filter 65 and out pump outlet
port 90. Primary drive shaft 74 thus also drives scavenge pump 178
by driving primary drive rotor 132, which enmeshes with its primary
driven rotor 134. The secondary drive shaft 75 drives both pumps
179 and 180 in secondary scavenge pump bank 175 by driving first,
secondary drive rotor 133 and second, secondary drive rotor 154,
which enmesh with their companion secondary driven rotors 135 and
155, respectively, in scavenge pumps 179 and 180, respectively. The
resulting suction created in scavenge pumps 178, 179 and 180 sucks
fluid via inlets 143, 144 and 160 from the target recovery points
in the engine. By using both shafts 74 and 75 of the primary
pressure pump 61 to drive rotors in the scavenge pumps, the
configuration of pump system 60 is dramatically shortened.
[0036] Pump system 60 has been described as having a pressure
manifold, filter manifold, filter and pressure relief valves.
However, the pump system of the present invention is contemplated
to comprise, at a minimum, the pressure pump 61 and at least two
scavenge pump banks contained in one or more scavenge pump
sections. The pressure manifold, filter manifold, filter, pressure
relief valves, and any other desired elements, fittings, or
connections can be provided separately or in combination to
operatively connect with such pump system.
[0037] Pressure pump 61 contains fluid moving elements in the form
of spur gears 71 and 72 and the fluid moving elements in the
various scavenge pumps 178-180 are in the form of 90.degree.
helical rotors. Alternative embodiments are contemplated where such
fluid moving elements can be any appropriate elements such as, and
without limitation, spur gears, helical rotors, gerotors or
impellers.
[0038] The present embodiment is directed to a pumping system for a
high performance racing engine. Alternative embodiments are
contemplated wherein pumping system 60 is used with other engines
or engine applications, such as and without limitation, diesel
engines, boat engines, lawnmowers, motorcycles, aircraft engines,
undersea vehicles or spacecraft. Alternative embodiments are
contemplated wherein pumping system 60 is used with other
mechanical devices, such as and without limitation, gearboxes or
fuel systems.
[0039] While the invention has been illustrated and described in
detail in the drawings and foregoing description, the same is to be
considered as illustrated and not restrictive in character, it
being understood that only the preferred embodiment and a few
alternative embodiments have been shown and described and that all
changes and modifications that come within the spirit of the
invention are desired to be protected.
* * * * *