U.S. patent application number 14/117803 was filed with the patent office on 2014-05-29 for structure and method for adjusting balance of turbocharging device incorporating electric motor.
This patent application is currently assigned to MITSUBISHI HEAVY INDUSTRIES, LTD.. The applicant listed for this patent is MITSUBISHI HEAVY INDUSTRIES, LTD.. Invention is credited to Byeongil An, Hideaki Arita, Motoki Ebisu, Takashi Goto, Noriyuki Hayashi, Seiichi Ibaraki, Toshihiko Miyake, Katsuyuki Osako, Hiroshi Suzuki, Yukio Yamashita.
Application Number | 20140147306 14/117803 |
Document ID | / |
Family ID | 47296026 |
Filed Date | 2014-05-29 |
United States Patent
Application |
20140147306 |
Kind Code |
A1 |
Yamashita; Yukio ; et
al. |
May 29, 2014 |
STRUCTURE AND METHOD FOR ADJUSTING BALANCE OF TURBOCHARGING DEVICE
INCORPORATING ELECTRIC MOTOR
Abstract
An object is to increase portions (increase the amount of
correction), where the rotational balance of a rotary shaft of a
turbocharging device incorporating an electric motor is adjusted,
and to maintain sufficient motor driving force even under a high
temperature condition. In a balance adjusting structure for the
turbocharging device incorporating an electric motor, a rotor core
5 formed by laminating electromagnetic steel plates 51 is
interposed between rotor blades provided on one end or both ends, a
rotational balance adjusting member made of iron (magnetic
induction member) having a thickens larger than the thickness of
each electromagnetic steel plate 51 is disposed on an end of the
laminated electromagnetic steel plates 51, or between the laminated
layers.
Inventors: |
Yamashita; Yukio; (Tokyo,
JP) ; Hayashi; Noriyuki; (Tokyo, JP) ;
Ibaraki; Seiichi; (Tokyo, JP) ; Osako; Katsuyuki;
(Tokyo, JP) ; Ebisu; Motoki; (Tokyo, JP) ;
An; Byeongil; (Tokyo, JP) ; Suzuki; Hiroshi;
(Tokyo, JP) ; Arita; Hideaki; (Tokyo, JP) ;
Goto; Takashi; (Tokyo, JP) ; Miyake; Toshihiko;
(Chiyoda-ku, JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
MITSUBISHI HEAVY INDUSTRIES, LTD. |
Tokyo |
|
JP |
|
|
Assignee: |
MITSUBISHI HEAVY INDUSTRIES,
LTD.
Tokyo
JP
|
Family ID: |
47296026 |
Appl. No.: |
14/117803 |
Filed: |
June 4, 2012 |
PCT Filed: |
June 4, 2012 |
PCT NO: |
PCT/JP2012/064395 |
371 Date: |
January 13, 2014 |
Current U.S.
Class: |
417/410.1 |
Current CPC
Class: |
F01D 5/027 20130101;
F02B 39/10 20130101; F01D 15/10 20130101; Y02T 10/12 20130101; H02K
7/04 20130101; F02B 37/005 20130101; F04D 13/06 20130101; F02B
37/10 20130101; F05D 2220/40 20130101; H02K 7/14 20130101; H02K
15/165 20130101; Y02T 10/144 20130101 |
Class at
Publication: |
417/410.1 |
International
Class: |
F04D 13/06 20060101
F04D013/06 |
Foreign Application Data
Date |
Code |
Application Number |
Jun 8, 2011 |
JP |
2011-127913 |
Claims
1. A balance adjusting structure for turbocharging device
incorporating an electric motor, comprising: at least one rotor
blade disposed in a housing; a shaft connected to the rotor blade;
a bearing formed in the housing, and configured to rotatably
axially support the shaft; a rotor core penetrated by the shaft;
and a stator disposed at a position facing the rotor core in the
housing, and configured to rotate and drive the rotor core together
with the shaft by a magnetic field, wherein the rotor core
includes: a sleeve fitted onto the shaft; a plurality of
electromagnetic steel plates laminated in an axial direction of the
sleeve and fitted onto the sleeve; and a rotational balance
adjusting member disposed on a part of the electromagnetic steel
plates in a laminating direction, and having a thickness larger
than a thickness of each electromagnetic steel plate, and the
rotational balance adjusting member is processed to adjust
rotational balance.
2. The balance adjusting structure for a turbocharging device
incorporating an electric motor according to claim 1, wherein the
rotor core is configured such that the rotational balance adjusting
member is disposed on an intermediate part of the laminated
electromagnetic steel plates.
3. The balance adjusting structure for a turbocharging device
incorporating an electric motor according to claim 1, wherein the
rotor core includes: the sleeve fitted onto the shaft; the
plurality of electromagnetic steel plates fitted onto the sleeve,
and arranged as a lamination; and a rotational balance adjusting
member fixed to both ends of the sleeve, and configured to fix and
sandwich the plurality of electromagnetic steel plates.
4. The balance adjusting structure for a turbocharging device
incorporating an electric motor according to claim 1, wherein the
rotor core has: a rotational balance adjusting member fitted onto
the sleeve, and interposed on an intermediate part of the plurality
of electromagnetic steel plates that are arranged as a lamination;
and a rotational balance adjusting member configured to fix and
sandwich both ends of the laminated electromagnetic steel plates,
and fixed to both ends of the sleeve.
5. The balance adjusting structure for a turbocharging device
incorporating an electric motor according to claim 1, wherein at
least one rotational balance adjusting member of the rotational
balance adjusting members is configured by assembling laminated
layers of the same magnetic material as the electromagnetic steel
plates of the rotor core.
6. The balance adjusting structure for a turbocharging device
incorporating an electric motor according to claim 1, wherein the
turbocharging device incorporating an electric motor is either a
turbo charger incorporating a motor generator that is mounted with
a turbine wheel, which is a rotor blade for utilizing exhaust gas
energy on an end of the shaft penetrating the rotor core and the
bearing, and that is also mounted with a compressor impeller, which
is a rotor blade for compressing inlet air on other end thereof, or
an electric supercharger that does not have the turbine wheel and
that is mounted with a compressor impeller for compressing inlet
air only on one end of the shaft.
7. A rotational balance adjusting method for a rotor of the
turbocharging device incorporating an electric motor, the method
comprising the steps of: performing rotational balance adjustment
by singly using a rotor blade; assembling a rotor including the
rotor blade, and a rotor core having a rotational balance adjusting
member made of a magnetic material; measuring a balance amount by
rotating the rotor; and adjusting and processing rotational balance
by using a rotor blade fastening nut, the rotational balance
adjusting member of the rotor core, or both of the rotor blade
fastening nut and the rotational balance adjusting member, on the
basis of a result of measurement.
8. The balance adjusting method for a turbocharging device
incorporating an electric motor according to claim 7, further
comprising a step of adjusting rotational balance by singly using
the rotor core before the step of assembling the rotor.
Description
TECHNICAL FIELD
[0001] The present invention relates to a structure and a method
for adjusting rotational balance of a rotor of a turbocharging
device incorporating an electric motor turbocharging suction air to
an internal combustion. Herein, the turbocharging device
incorporating an electric motor includes a turbo charger
incorporating a motor generator, a turbo charger incorporating an
electric motor, an electric supercharger, and the like.
BACKGROUND ART
[0002] Turbo chargers for compressing and turbocharging suction air
by driving with exhaust gas of an internal combustion has been
widely used, in order to improve output of the internal
combustion.
[0003] There has been used a turbo charger incorporating a motor
generator that improves acceleration responsiveness by
incorporating an electric motor in a rotary shaft of the
turbocharging device and assisting the acceleration of rotation of
a compressor impeller, and collects energy by converting exhaust
gas energy into electric energy. In a case where exhaust gas energy
is not utilized and a turbine is omitted, the turbo charger
incorporating a motor generator is an electric supercharger that
rotates a compressor impeller by only an electric motor.
[0004] FIG. 6 is a schematic configuration diagram of an engine 01
mounted with a turbo charger 03 incorporating a motor generator
disclosed in Japanese Patent Application Laid-open No. H8-182382
(Patent Document 1). A turbine wheel 031 of the turbo charger
incorporating a motor generator 03 is driven by exhaust gas from an
exhaust manifold 011 of the engine 01. A compressor impeller 032
coaxially connected to the turbine wheel 031 is driven, so that
suction air from an air cleaner (not shown) is supplied to the
engine 01 via a suction manifold 012.
[0005] A motor rotor 05 for assisting rotation (driving) of the
compressor impeller 032 is disposed on the intermediate-portion of
a shaft 041 for connecting the turbine wheel 031 and the compressor
impeller 032.
[0006] As shown in FIG. 7, the motor rotor 05 is axially rotatably
supported on a pair of bearing support parts provided in a housing
(not shown) of the turbo charger incorporating a motor generator 03
via bearings 049.
[0007] Reference numeral 06 denotes an engine control unit (ECU),
which controls operation of the engine 01, flows a current to a
stator 033 depending on the operation status of the engine 1, and
also controls operation of the turbo charger incorporating a motor
generator 03. Reference numeral 07 denotes a battery, which is a
power supply of a controller.
[0008] FIG. 7 is a schematic configuration diagram of a
conventional motor rotor.
[0009] A motor rotor 05 has a step part 044 that is a narrow shaft
part on a side closer to a compressor impeller 043, on an
intermediate part in the thrust direction of a shaft 041 having an
end mounted with a turbine wheel 042. A nut 046, which is screwed
with a screw part formed on the end of the narrow shaft part,
through a thrust bush 056, a rotor 051, an oil seal accessory 054,
and the compressor impeller 043 which are fitted with (fitted onto)
the narrow shaft part, presses and positions these components with
respect to the step part 044.
[0010] A magnet 052 (permanent magnet) is fitted onto the narrow
shaft part of the shaft 041, a sleeve 057 is further fitted onto
the outer peripheral part of the magnet 052 to be fixed to the
narrow shaft part of the shaft 041, thereby forming the rotor
051.
[0011] In this case, the sleeve 057 needs to be fitted onto the
outer peripheral part of the magnet arranged on the rotor 051, in
order to prevent breakage and scattering of the magnet.
[0012] A stator 033 for rotating and driving the shaft 041 by
utilizing magnetism of the magnet of the rotor 051 is arranged on
the housing side of the turbo charger incorporating a motor
generator 03, facing the rotor 051.
[0013] As a technology related to such a turbo charger
incorporating a motor generator, Japanese Patent Application
Laid-open No. 2000-145468 (Patent Document 2) is known. [0014]
Patent Document 1: Japanese Patent Application Laid-open No.
H8-182382 [0015] Patent Document 2: Japanese Patent Application
Laid-open No. 2000-145468
[0016] However, since the turbo charger incorporating a motor
generator is used under a high temperature environment resulting
from exhaust gas, performance of a motor that utilizes a magnet
significantly deteriorates with rise in temperature, and such a
motor is not suitable.
[0017] To cope with this, there is a magnetic inductor type motor
as one of motors that do not use a magnet.
[0018] The magnetic inductor type motor is configured that a rotor
made of laminated electromagnetic steel plates and iron, or
laminated electromagnetic steel plates are driven by a stator
arranged around the rotor.
[0019] However, since the rotor rotates at a high speed in a state
of being arranged between a turbine wheel and a compressor
impeller, it is important to adjust the rotational balance (dynamic
balance) of the rotor made of the laminated electromagnetic steel
plates and iron, or the laminated electromagnetic steel plates for
balancing. Therefore, the adjustment of the rotational balance on a
conventional adjustment part (e.g., a nut part for fastening the
compressor impeller to a rotary shaft of the turbo charger) can not
cope with increase in an adjustment amount, or fine adjustment.
DISCLOSURE OF THE INVENTION
[0020] The present invention has been conceived in order to solve
such problems, and an object thereof is to provide a structure and
a method for adjusting balance of a turbo charger incorporating a
motor generator capable of achieving increase in adjustment parts
(increase in an adjustment amounts and ensuring fine adjustment)
for adjusting the rotational balance of a rotary shaft of the turbo
charger, and preventing performance deterioration while maintaining
sufficient motor driving force even under a high temperature
condition.
[0021] According to the present invention, in order to attain this
object, a balance adjusting structure for a turbocharging device
incorporating an electric motor includes: at least one rotor blade
disposed in a housing; a shaft connected to the rotor blade; a
bearing formed in the housing, and configured to rotatably axially
support the shaft; a rotor core penetrated by the shaft; and a
stator disposed at a position facing the rotor core in the housing,
and configured to rotate and drive the rotor core together with the
shaft by a magnetic field, wherein the rotor core has a sleeve
fitted onto the shaft, a plurality of electromagnetic steel plates
laminated in an axial direction of the sleeve and fitted onto the
sleeve, and a rotational balance adjusting member disposed on a
part of the electromagnetic steel plates in a laminating direction,
and having a thickness larger than a thickness of each
electromagnetic steel plate, and the rotational balance adjusting
member is processed to adjust rotational balance.
[0022] With such a configuration, although heretofore, rotational
balance has been adjusted by cutting a nut for fastening a shaft on
a compressor impeller being a rotor blade of the turbocharging
device incorporating an electric motor, the rotational balance
adjusting member enabling balance adjustment is added in addition
to the nut part, so that the number of portions where the
rotational balance is adjusted increases, thereby enabling higher
accurate rotational balance adjustment.
[0023] Additionally, the rotational balance adjusting member is
made of a magnetic material, for example, iron, and hence magnetic
force resulting from magnetic induction is strengthened. This
contributes to improvement of performance as a turbo charger with
improvement of performance as an electric motor.
[0024] In the present invention, the rotor core is preferably
configured such that the rotational balance adjusting member is
interposed on an intermediate part in the laminating direction of
the laminated electromagnetic steel plates.
[0025] The rotational balance adjusting member is interposed on the
intermediate part in the laminating direction of the laminated
electromagnetic steel plates, particularly on a central part is
referred to as a center ring.
[0026] Thus, the rotational balance adjusting member that is
interposed on the intermediate part in the laminating direction of
the laminated electromagnetic steel plates, particularly on the
central part, and hence magnetic induction on the both sides of the
rotational balance adjusting member is uniformed, thereby improving
output as a motor.
[0027] In the present invention, the rotor core preferably includes
the sleeve fitted onto the shaft, the plurality of electromagnetic
steel plates fitted onto the sleeve, and arranged as a lamination,
and a rotational balance adjusting member fixed to both ends of the
sleeve, and configured to fix and sandwich the plurality of
electromagnetic steel plates.
[0028] With such a configuration, it is possible to form the rotor
core in a cartridge-type, and facilitate assembly to the shaft.
Additionally, the rotational balance adjustment portions are fixed
to the both ends of the sleeve, and the number of the adjustment
portions are increased, and hence an adjustment capacity in final
rotational balance adjustment after the assembly to the rotor
increases, and fine adjustment is possible. Consequently, high
accurate rotational balance adjustment is possible.
[0029] In the present invention, the rotor core preferably includes
a rotational balance adjusting member fitted onto the sleeve, and
interposed on an intermediate part in the laminating direction of
the plurality of electromagnetic steel plates that are arranged as
a lamination, and a rotational balance adjusting member configured
to fix and sandwich both ends of the laminated electromagnetic
steel plates, and fixed to both ends of the sleeve.
[0030] With such a configuration, it is possible to form the rotor
core in a cartridge-type, and facilitate assembly to the shaft.
Additionally, the rotational balance adjustment portions are fixed
to the both ends and the intermediate part of the sleeve, and the
number of the adjustment portions increases. Therefore, even when
rotational balance adjustment singly using the rotor core that
requires a large number of steps is omitted, and merged into final
rotational balance adjustment after the assembly of the rotor, an
adjustment amount can be greatly expanded. Consequently, high
accurate rotational balance adjustment is possible.
[0031] In the present invention, at least one balance adjustment
member of the balance adjustment members is preferably configured
by assembling laminated layers of the same magnetic material as the
electromagnetic steel plates of the rotor core.
[0032] With such a configuration, as the rotational balance
adjusting member interposed on the intermediate part in the
laminating direction of the laminated electromagnetic steel plates,
particularly on the central part, the center ring is made of, for
example, an electromagnetic steel plate being a magnetic material
or iron, and hence magnetic force resulting from magnetic induction
is strengthened. This enables contribution to improvement of
performance as a turbocharging device incorporating an electric
motor with improvement of performance as an electric motor.
Furthermore, the electromagnetic steel plate is used for the center
ring, and hence assembly of the center ring is completed in a step
of assembling the electromagnetic steel plates of the rotor core.
Consequently, the number of assembly steps can be further
reduced.
[0033] In the present invention, the turbocharging device
incorporating an electric motor is preferably either a turbo
charger incorporating a motor generator that is mounted with a
turbine wheel, which is a rotor blade for utilizing exhaust gas
energy on an end of the shaft penetrated by the rotor core and the
bearing, and that is mounted with a compressor impeller, which is a
rotor blade for compressing inlet air on other end thereof, or an
electric supercharger that does not have the turbine wheel and that
is mounted with a compressor impeller for compressing inlet air
only on one end of the shaft.
[0034] Furthermore, according to the present invention, a
rotational balance adjusting method for a rotor of a turbo charger
incorporating a motor generator includes the steps of: performing
rotational balance adjustment by singly using a rotor blade, for
example, such as a turbine wheel, and a compressor impellor;
assembling a rotor including the turbine wheel, the compressor
impellor, and a rotor core having a rotational balance adjusting
member made of a magnetic material; measuring a balance amount by
rotating the rotor; and adjusting and processing rotational balance
by using an compressor fastening nut, the rotational balance
adjusting member of the rotor core, or both of the compressor
fastening nut and the rotational balance adjusting member, on the
basis of a result of measurement.
[0035] With such a configuration, the compressor fastening nut and
the rotational balance adjusting member of the rotor core enable
the rotational balance adjustment portions, and increase in the
number of the adjustment portions and fine adjustment are possible.
Consequently, even when rotational balance adjustment singly using
the rotor core that requires a large number of steps is omitted,
and merged into final rotational balance adjustment after the
assembly of the rotor, high accurate rotational balance adjustment
is possible.
[0036] In the present invention, a step of adjusting rotational
balance by singly using the rotor core before the step of
assembling the rotor may be further added.
[0037] Thus, the step of adjusting rotational balance by singly
using the rotor core is further added, and hence it is possible to
obtain the rotor with higher accurate rotational balance.
[0038] According to the present invention, although heretofore,
rotational balance has been adjusted by cutting a nut for fastening
a shaft on a compressor impeller, the rotational balance adjusting
member enabling balance adjustment is added to the rotor core in
addition to the nut part, so that the number of portions where the
rotational balance is adjusted increases, thereby enabling higher
accurate rotational balance adjustment.
[0039] Additionally, the rotational balance adjusting member is
made of a magnetic material, for example, iron, and hence magnetic
force resulting from magnetic induction is strengthened. This
contributes to improvement of performance as a turbo charger with
improvement of performance as an electric motor.
BRIEF DESCRIPTION OF THE DRAWINGS
[0040] FIG. 1 is a schematic structure diagram of a turbine rotor
according to a first embodiment of the present invention;
[0041] FIG. 2 is a schematic structure diagram of a turbine rotor
according to a second embodiment of the present invention;
[0042] FIG. 3 is a schematic structure diagram of a turbine rotor
according to a third embodiment of the present invention;
[0043] FIG. 4 is a flowchart of processes of rotational balance
adjustment work of the turbine rotor according to the first
embodiment of the present invention;
[0044] FIG. 5 is a flowchart of processes of another rotational
balance adjustment work of the turbine rotor according to the first
embodiment of the present invention;
[0045] FIG. 6 shows a schematic configuration diagram of an engine
mounted with a conventional turbo charger incorporating a motor
generator; and
[0046] FIG. 7 shows a schematic explanatory diagram of a
conventional turbine rotor.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0047] Hereinafter, embodiments of the present invention will be
described in detail with reference to the figures.
[0048] As specific names of a rotor blade, a turbine wheel, and a
compressor impeller are used in the description of these
embodiments. Additionally, as long as not stated specifically in
particular, size, quality of materials, shape, relative arrangement
of components described in these embodiments are not intended to
limit the scope of the invention, but merely exemplary
examples.
First Embodiment
[0049] A turbine rotor according to a first embodiment of the
present invention will be described with reference to FIG. 1.
[0050] A turbine rotor 1 includes a shaft 4, a turbine wheel 2
disposed on one end of the shaft 4, a compressor impeller 3
disposed on the other end thereof, two bearings 7 disposed between
the turbine wheel 2 and the compressor impeller 3 at intervals, and
a rotor core 5 that serves as an electric rotor, and is disposed
between the two bearings 7, and the rotor core 5 is mounted on the
shaft 4 via a sleeve 53.
[0051] The present invention is applicable to both of a case where
the respective bearings 7 are arranged on both outer ends of the
rotor core 5 as described above, and a case where the two (pair of)
bearings 7 are arranged between the turbine wheel 2 and the rotor
core 5 at intervals.
[0052] The shaft 4 is a solid shaft, has a stepped part 44 narrowed
from an intermediate part, and is a rotary shaft having a thick
portion 41 on one end and a narrow portion 42 on the other end. The
turbine wheel 2 that is driven by exhaust gas is fixed to the end
of the thick portion 41 of the shaft 4. The bearing 7 fixed to a
bearing support part formed in a turbine housing (not shown) is
disposed on a back surface side of the turbine wheel 2 via a first
seal ring 43 formed integrally with the shaft 4.
[0053] The rotor core 5 that incorporates the sleeve 53 is fitted
onto the narrow portion 42 of the shaft 4 by employing, as a
stopper, the stepped part 44 being a stopper part. The rotor core 5
is configured such that a plurality of electromagnetic steel plates
51 having circular circumference are inserted around the sleeve 53
to be laminated in the plate thickness direction of the
electromagnetic steel plates 51. A center ring 52 that is a
rotational balance adjusting member, and is made of an
electromagnetic steel plate being a magnetic material, or iron is
interposed between the electromagnetic steel plates on the
intermediate part, particularly the central part, in the laminating
direction of the laminated electromagnetic steel plates 51.
[0054] On a side closer to the compressor impeller 3 of the rotor
core 5, sleeve 45 fitted onto the narrow portion 42 of the shaft 4
abuts. On the other end of the shaft 4, the compressor impeller 3
is fixed with a nut 31 for fastening via a second seal ring 46.
[0055] Accordingly, the rotor core 5 has a structure of regulating
relative movement in the rotational direction with the shaft 4 by
application of proper pressing by the second seal ring 46
interposed between the nut 31 and the rotor core 5.
[0056] The bearings 7 disposed between the rotor core 5 and the
compressor impeller 3 is fitted onto the sleeve 45.
[0057] With such a configuration, the center ring 52 serves as an
adjustment cut part of the rotational balance of the turbine rotor
1, in addition to the nut 31, thereby increasing an adjustment
range of the rotational balance.
[0058] Additionally, the center ring 52 has a diameter larger than
that of the nut 31, and hence effects of the balance adjustment of
the center ring 52 is larger even if the cutting amount is
unchanged, and high accurate adjustment is possible in a wide
range. Furthermore, fine adjustment is possible.
[0059] Moreover, the rotational balance adjusting member made of an
electromagnetic steel plate or iron is disposed on the intermediate
part, particularly on the central part, of the laminated
electromagnetic steel plates 51, and hence magnetic induction
amounts on the both sides of the rotational balance adjusting
member are uniformed, thereby exerting an effect of improving
output as a motor.
[0060] In this embodiment, the center ring 52 that serves as the
rotational balance adjusting member is disposed on the intermediate
part, particularly on the central part, in the laminating direction
of the electromagnetic steel plates 51. However, also in a case
where the center ring 52 is disposed on any portion in the
laminating direction other than the central part, an action effect
as the rotational balance adjusting member can be obtained.
[0061] The correction portion for adjusting the rotational balance
of the turbine rotor 1 has been described. Now, description will
cover a flow of processes of a rotational balance adjusting method
of the turbine rotor 1 shown in FIG. 4.
[0062] Step S1 of setting the turbine wheel 2 in the balance
measurement device, measuring a rotational balance amount, and
performing balance adjustment of the single turbine wheel 2 on the
basis of a result of the measurement.
[0063] Next, Step S2 of setting the compressor impeller 3 in the
balance measurement device, and performing balance adjustment of
the single compressor impeller 3 similarly to Step S1.
[0064] The rotational balance adjustment of the turbine wheel 2 and
the compressor impeller 3 is performed (cut) on the rear side of
the rear side (X part (see FIG. 1)) of the turbine wheel 2 and on
the rear side of the rear side (Y part (see FIG. 1)) of the
compressor impeller 3.
[0065] Step S3 of assembling the turbine rotor 1 by mounting the
turbine wheel 2, the compressor impeller 3, the rotor core 5, the
bearings 7, the sleeve 45, and the like on the shaft 4.
[0066] Step S4 of setting the assembled turbine rotor 1 in the
balance measurement device, and measuring a balance amount of the
whole of the turbine rotor 1.
[0067] Step S5 of performing balance adjustment by cutting work of
a balance adjustment part A of the nut 43 for fastening the
compressor impeller or cutting work of a balance adjustment part B
of the outer peripheral part of the center ring 52, on the basis of
a result of measurement.
[0068] Furthermore, in Step S5, the cutting work order as to which
cutting work is first performed, the cutting work of the nut 31 or
the cutting work of the center ring 52 may be determined every time
the cutting work is performed.
[0069] Then, the turbine rotor 1 is set in the balance measurement,
device again, the balance adjustment is terminated by Step S6 of
confirming the balance of the turbine rotor 1.
[0070] In a case where the result of measurement in Step S6 is not
an arbitrary balance amount or less, Step S5 and Step S6 are
repeatedly performed.
[0071] Since various balance measurement devices are disclosed in
patent documents (e.g., Japanese Patent Application Laid-open Nos.
2008-58008 and 2008-8219) and the like, description of the balance
measurement device will be omitted in this embodiment.
[0072] According to the flow of the processes of the rotational
balance adjusting method of the turbine rotor 1 of this embodiment,
the adjustment portions for rotational balance of the assembled
turbine rotor 1 are the balance adjustment A of the nut 31, and the
balance adjustment B of the center ring 52, and hence the balance
adjustment amount is increases with increase in the balance
adjustment portions, and high accurate balance adjustment is
possible in a wide range. Furthermore, fine adjustment is also
possible.
[0073] Moreover, the center ring 52 has a diameter lager than that
of the nut 31, and hence the effects of the balance adjustment of
the center ring 52 are larger even if the cutting amount is
unchanged. Accordingly, the cutting work of the nut 31 can be
sometimes omitted by first performing the adjustment cutting of the
center ring 52, and reduction in the number of processes can be
expected.
[0074] Now, a flow of processes of another rotational balance
adjusting method of the turbine rotor 1 will be described with
reference to FIG. 5.
[0075] Step S10 of setting the turbine wheel 2 in the balance
measurement device, measuring a rotational balance amount, and
performing balance adjustment of the single turbine wheel 2 on the
basis of a result of the measurement.
[0076] Next, Step S11 of setting the compressor impeller 3 in the
balance measurement device, and performing balance adjustment of
the single compressor impeller 3 similarly to Step S10.
[0077] Then, Step S12 of setting the rotor core 5 in the balance
measurement device, and performing balance adjustment of the single
rotor core 5 similarly to Step S10.
[0078] The rotational balance adjustment of the turbine wheel 2 and
the compressor impeller 3 is performed on the rear side (X part) of
the turbine wheel 2 and on the rear side (Y part) of the compressor
impeller 3.
[0079] Step S13 of assembling the turbine rotor 1 by mounting the
turbine wheel 2, the compressor impeller 3, the rotor core 5, the
bearings 7, the sleeve 45, and the like on the shaft 4.
[0080] Step S14 of setting the assembled turbine rotor 1 in the
balance measurement device, and measuring a balance amount of the
whole of the turbine rotor 1.
[0081] Step S15 of performing balance adjustment by cutting work of
the balance adjustment part A of the nut 43 for fastening the
compressor impeller or cutting work of the balance adjustment part
B of the outer peripheral part of the center ring 52, on the basis
of a result of measurement.
[0082] In Step S15, the cutting work order as to which cutting work
is first performed, the cutting work of the nut 31 or the cutting
work of the center ring 52 may be determined every time the cutting
work is performed.
[0083] Then, the turbine rotor 1 is set in the balance measurement
device again, the balance adjustment is performed by Step S16 of
confirming the balance of the turbine rotor 1.
[0084] In a case where the result of measurement in Step S16 is an
arbitrary balance amount or more, Step S15 and Step S16 are
repeatedly performed.
[0085] In this embodiment, according to the flow of the processes
of the rotational balance adjusting method of the turbine rotor 1,
rotational balance adjustment of the single rotor core 5 that is
the heaviest among the components is performed, and hence the
rotational balance adjustment amount of the assembled turbine rotor
1 is reduced, and balance adjustment performed after the turbine
rotor 1 is assembled is facilitated.
Second Embodiment
[0086] In this second embodiment, components that are identical
with those of the first embodiment are denoted by the same
reference numerals, and description thereof will be omitted.
[0087] As shown in FIG. 2, a rotor core 8 is configured such that a
plurality of electromagnetic steel plates 51 are disposed on a
sleeve 81 fitted onto a narrow portion 42 of a shaft 4.
[0088] The sleeve 81 is formed with a flange part 82 radially from
an open edge on one end side of the sleeve 81.
[0089] On the outer peripheral part of the sleeve 81, the
electromagnetic steel plates 51 are fitted onto the sleeve 81 so as
to be laminated in the thrust direction of the sleeve 81.
[0090] On the other end side of the sleeve 81, a pressing ring 83
is fitted onto the outer peripheral part of the sleeve 81 to be
fixed in caulking to the sleeve 81 in a state of pressing the
electromagnetic steel plates 51 in the thrust direction.
[0091] Additionally, a center target 55 having an outer diameter
substantially identical with that of the electromagnetic steel
plates 51, and a thickness larger than that of each electromagnetic
steel plate 51 is disposed between the electromagnetic steel plates
51 and the flange part 82. The center target 55 is a part of a
revolution speed detection unit used in a case where the revolution
speed of the turbine rotor 1 is controlled. In a case where the
revolution speed does not need to be detected, the center target 55
is unnecessary.
[0092] The rotor core 8 is pressed against a stepped part 44 via a
compressor impeller 3 and a sleeve 45 by a nut 43, thereby
preventing slip in the rotational direction with respect to the
shaft 4.
[0093] The flange part 82 and the pressing ring 83 each have an
outer diameter substantially identical with that of each
electromagnetic steel plate 51, and have an action as a rotational
balance adjusting member.
[0094] The processes of a rotational balance adjusting method is
similar to those of the first embodiment, and therefore description
thereof will be omitted.
[0095] The electromagnetic steel plates 51 are fitted onto the
sleeve 81 in a laminated manner, and the both sides of the
electromagnetic steel plates 51 are sandwiched between the flange
part 82 and the pressing ring 83, thereby facilitating assembly of
the shaft 4 and improving the quality of the assembly.
[0096] Furthermore, a balance adjustment part C of the flange part
82, and a balance adjustment part D of the pressing ring 83 serve
as rotational balance adjustment portions, in addition to a balance
adjustment part A of the nut 43, thereby increasing an adjustment
amount of the rotational balance, and enabling fine adjustment.
Third Embodiment
[0097] In this third embodiment, components that are identical with
those of the first and second embodiments are denoted by the same
reference numerals, and description thereof will be omitted.
[0098] As shown in FIG. 3, a rotor core 9 is configured such that a
plurality of electromagnetic steel plates 51 and a center ring 52
being a rotational balance adjusting member are disposed on a
sleeve 81 fitted onto a narrow portion 42 of a shaft 4.
[0099] The sleeve 81 is formed with a flange part 82 radially from
an open edge on the one end side of the sleeve 81.
[0100] On the outer peripheral part of the sleeve 81, the
electromagnetic steel plates 51 are fitted onto the sleeve 81 so as
to be laminated in the thrust direction of the sleeve 81. The
center ring 52 being a rotational balance adjusting member is
disposed on the intermediate part of the laminated electromagnetic
steel plates 51 in the thrust direction of the sleeve 81,
particularly on the central part. On the other end side of the v
sleeve 81, a pressing ring 83 is fitted onto the outer peripheral
part of the sleeve 81 to be fixed in caulking to the sleeve 81 in a
state of pressing the electromagnetic steel plates 51 in the thrust
direction.
[0101] The processes of a rotational balance adjusting method is
similar to those of the first embodiment, and therefore description
thereof will be omitted.
[0102] The electromagnetic steel plates 51 are fitted onto the
sleeve 81 in a laminated manner, and the both sides of the
electromagnetic steel plates 51 are sandwiched between the flange
part 82 and the pressing ring 83, thereby forming the rotor core 8
in a cartridge-type, facilitating assembly to the shaft 4, and
improving the quality of the assembly. Additionally, both sides of
the electromagnetic steel plates 51 are sandwiched between the
flange part 82 and the pressing ring 83, thereby regulating
relative movement of the electromagnetic steel plates 51 and the
sleeve 81 during rotation, and easily forming the rotor core 8 in a
cartridge type.
[0103] Furthermore, the center ring 52 is interposed on the
intermediate part (central part) of the laminated electromagnetic
steel plates 51, and hence magnetic induction is uniformed, thereby
improving output as a motor.
[0104] Moreover, a balance adjustment part C of the flange part 82,
a balance adjustment part D of the pressing ring 83, and a balance
adjustment part B of the center ring 52 serve as rotational balance
adjustment portions, in addition to a balance adjustment part A of
a nut 43, thereby increasing an adjustment amount of the rotational
balance, and enabling fine adjustment.
INDUSTRIAL APPLICABILITY
[0105] In order to improve the output of an internal combustion, a
motor generator is incorporated in a rotary shaft of a turbo
charger that is driven by exhaust gas of the internal combustion,
and compresses and turbocharges supply air, and the rotation of a
compressor impeller is assisted for acceleration, thereby improving
acceleration responsiveness. Additionally, the turbo charger
incorporating a motor generator is suitable for use in an internal
combustion that is capable of converting exhaust gas energy into
electric energy.
* * * * *