CN210062673U - Power plant - Google Patents
Power plant Download PDFInfo
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- CN210062673U CN210062673U CN201920245450.5U CN201920245450U CN210062673U CN 210062673 U CN210062673 U CN 210062673U CN 201920245450 U CN201920245450 U CN 201920245450U CN 210062673 U CN210062673 U CN 210062673U
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- conductive
- housing
- axle
- motor
- oil seal
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/64—Electric machine technologies in electromobility
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- Retarders (AREA)
- Sealing With Elastic Sealing Lips (AREA)
- Sealing Devices (AREA)
- General Details Of Gearings (AREA)
Abstract
The utility model provides a need not to maintain and can restrain the power device of the production of noise. The power device comprises: an electric motor; an inverter; a transmission; a differential device; a case that houses the motor, the transmission, and the differential device; a left axle having one end connected to the differential device and the other end extending from the housing and connected to a left wheel; and a right axle having one end connected to the differential device and the other end extending from the housing and connected to a right wheel. A conductive portion having conductivity is provided between the housing and at least one of the left and right axles. The conductive part includes: conductive grease; and an outer peripheral conductive member and an inner peripheral conductive member provided in the conductive grease, the outer peripheral conductive member being fixed to the housing, the inner peripheral conductive member being fixed to the axle so as to be opposed to the outer peripheral conductive member in a radial direction.
Description
Technical Field
The utility model relates to a set up power device on electric vehicle.
Background
Patent document 1 describes a power plant including an electric motor that drives left and right wheels of a vehicle, a transmission disposed on a power transmission path between the electric motor and the left and right wheels, and a differential device that distributes an output shifted by the transmission to the left and right wheels. In such a power unit, a noise current (noise current) generated by an inverter (inverter) for controlling the motor is transmitted to the axle, and the axle may serve as an antenna (antenna) to radiate noise (hereinafter also referred to as radio noise).
As a measure against the radio noise, for example, patent document 2 describes a technique of arranging a sliding brush on a shaft element of a power transmission mechanism and providing the sliding brush on a vehicle body.
[ Prior art documents ]
[ patent document ]
[ patent document 1] Japanese patent application laid-open No. 2002-104001
[ patent document 2] Japanese patent laid-open No. 2016-105693
SUMMERY OF THE UTILITY MODEL
[ problem to be solved by the utility model ]
However, in the measure against radio noise described in patent document 2, a space for providing the sliding brush must be additionally secured, and maintenance of the sliding brush must be performed.
The utility model provides a need not to maintain, and the power device of the production that can the noise suppression.
[ means for solving problems ]
The utility model relates to a power device, include:
a motor that drives a left wheel and a right wheel of a vehicle;
a motor control device that controls the motor;
a speed reducer disposed on a power transmission path between the motor and the left and right wheels;
a differential device that distributes output shifted by the speed reducer to the left wheel and the right wheel;
a housing that houses the motor, the speed reducer, and the differential device;
a left axle having one end connected to the differential device and the other end extending from the housing and connected to the left wheel; and
a right axle having one end connected to the differential device and the other end extending from the housing and connected to the right wheel; and is
A conductive portion having conductivity is provided between the housing and at least one of the left and right axles,
the conductive portion includes conductive grease (grease) and a pair of conductive members provided in the conductive grease,
one of the pair of conductive members is fixed to the housing,
the other of the pair of conductive members is fixed to the axle so as to be opposed to the one of the conductive members in a radial direction.
[ effects of the utility model ]
According to the present invention, since the conductive portion having conductivity is provided between the housing and the axle, the noise radiation generated by the motor control device can be prevented. Further, since the rotation of the axle is decelerated by the speed reducer, the influence of the friction force (friction) can be reduced. Further, by using conductive grease and a pair of conductive members both having conductivity in the conductive portion, it is possible to reliably transmit the noise current from the axle to the housing.
Drawings
Fig. 1 is a schematic view showing a part of a vehicle on which a power unit according to the present invention is mounted.
Fig. 2 is a cross-sectional view of a power unit according to an embodiment of the present invention.
Fig. 3 is a sectional view of a conductive portion built in the power unit of fig. 2.
Description of the symbols
1: power plant
2: electric motor
3A: left axle
3B: right axle
4: shell body
5: speed variator
6: differential gear
71: inner oil seal (first oil seal)
72: outer side oil seal (second oil seal)
73: conductive grease
74: outer peripheral conductive member (conductive member)
75: inner peripheral side conductive member (conductive member)
INV: inverter (Motor control device)
WL: left wheel
WR: right wheel
Detailed Description
First, a vehicle V on which the power unit 1 of the present invention is mounted will be described with reference to fig. 1.
The vehicle V is a vehicle having the electric motor 2 as a drive source, and is installed as a front wheel drive device or a rear wheel drive device in an electric vehicle such as a hybrid vehicle or an electric vehicle. As shown in fig. 1, a vehicle V is equipped with a battery B and a power unit 1, the battery B and the motor 2 are electrically connected via an inverter INV that controls the motor 2, and the motor 2 is mechanically connected to a left wheel WL and a right wheel WR via a transmission 5 and a differential device 6.
[ Power plant ]
Hereinafter, an embodiment of the power unit 1 according to the present invention will be described with reference to fig. 2.
In fig. 2, reference numerals 3A and 3B denote left and right axles coupled to left and right wheels WL and WR, respectively, and are coaxially arranged in the vehicle width direction. The casing 4 of the power unit 1 is formed in a substantially cylindrical shape as a whole, and a motor 2 for driving the vehicle, a transmission 5 for decelerating the driving rotation of the motor 2, and a differential device 6 for distributing the driving rotation decelerated by the transmission 5 to the left and right axles 3A and 3B are disposed inside the casing.
The case 4 includes a first case 41 that houses the electric motor 2, and a second case 42 that houses the transmission 5 and the differential device 6. A partition wall 43 is provided at a boundary portion between the first casing 41 and the second casing 42, and the internal space of the first casing 41 and the internal space of the second casing 42 are partitioned by the partition wall 43. The bottom of the casing 4 functions as a reservoir 44 for storing lubricating oil, and stores the lubricating oil up to the oil level indicated by symbol L.
[ Motor ]
The motor 2 includes a stator 21 fixed to an inner peripheral portion of the first housing 41, and a rotor 22 rotatably disposed on an inner peripheral side of the stator 21. A rotor shaft 23 surrounding the outer periphery of the left axle 3A is coupled to the inner peripheral portion of the rotor 22, and the rotor shaft 23 is supported by the end wall 41a of the first housing 41 and the partition wall 43 via the bearing 24 and the bearing 25 so as to be relatively rotatable coaxially with the left axle 3A. One end side of the left axle 3A and the rotor shaft 23 extends through the partition wall 43 into the second casing 42, and the other end side of the left axle 3A extends through the end wall 41a of the first casing 41 to the outside of the casing 4. The motor 2 is electrically connected to an inverter INV provided outside the casing 4.
[ Gear change mechanism ]
The transmission 5 includes: a first gear 51 mechanically connected to the motor 2; a second gear 52 having the same rotational axis as the first gear 51 and mechanically connected to a differential case 61 of a differential device 6; a plurality of pinions (gear) 53 that mesh with the first gear 51 and the second gear 52; and a pinion carrier (pinion holder)54 that supports the plurality of pinion gears 53 so as to be rotatable and non-revolvable; when the driving rotation of the electric motor 2 is input from the first gear 51, the driving rotation decelerated via the pinion gear 53 and the second gear 52 is output to the differential case 61 of the differential device 6.
The first gear 51 includes an external gear and is formed integrally with the rotor shaft 23. The pinion gear 53 includes a large diameter gear 53a including an external gear, a small diameter gear 53b including an external gear, and a pinion shaft 53c integrally rotatably supporting the large diameter gear 53a and the small diameter gear 53 b. The large-diameter gear 53a is coupled to the pinion shaft 53c on the motor 2 side, and meshes with the first gear 51. The small-diameter gear 53b is formed integrally with the pinion shaft 53c on the differential device 6 side, and meshes with the second gear 52. The pinion shaft 53c rotatably supports the end portion on the motor 2 side to the partition wall 43 via a bearing 55, and rotatably supports the end portion on the differential device 6 side to the pinion support portion 54a of the pinion carrier 54 via a bearing 56.
The transmission 5 of the present embodiment includes, for example, three pinion gears 53, and the three pinion gears 53 are arranged at equal intervals (120 ° intervals) in the circumferential direction around the first gear 51.
In the second gear 52, the gear portion 52a includes an internal gear, and meshes with the small-diameter gear 53b of the pinion 53. The second gear 52 includes a connecting portion 52b extending from the gear portion 52a to the differential device 6 side across the outer peripheral side of the pinion carrier 54 (pinion supporting portion 54a), and the connecting portion 52b is mechanically connected to the differential case 61 of the differential device 6 via a connecting element such as a spline (spline).
The pinion carrier 54 includes three pinion supporting portions 54a that rotatably support the pinion shaft 53c of the pinion 53 via a bearing 56, three fixing portions 54b that are fixed to the bulkhead 43, and a cylindrical portion 54c formed at the center portion (the inner diameter side of the pinion supporting portions 54a and the fixing portions 54 b) of the pinion carrier 54.
The pinion supporting portion 54a is disposed closer to the differential case 61 of the differential device 6 than the meshing portion M between the second gear 52 and the small-diameter gear 53b of the pinion 53, and the second gear 52 is mechanically connected to the differential case 61 of the differential device 6. Thus, the pinion gear 53 can be appropriately supported in a state of both ends being supported by supporting the other end side of the pinion shaft 53c, which is supported by the partition wall 43 through the bearing 55, to the pinion supporting portion 54a through the bearing 56.
The three fixing portions 54b are positioned at intermediate portions of the pinion supporting portions 54a adjacent in the circumferential direction, and are fastened to the partition wall 43 via bolts 57, respectively. Thereby, the partition wall 43 serves as a support member for the pinion shaft 53c and a support member for the pinion carrier 54.
The cylindrical portion 54c rotatably supports one end side of the differential case 61 via a bearing 65. Thus, the pinion carrier 54 serves as both a support member for the pinion 53 and a support member for the differential case 61.
[ differential device ]
The differential device 6 includes a differential case 61, a differential pinion shaft 62, a differential pinion gear 63, and left and right side gears (side gears) 64A and 64B, in order to allow a difference in rotation between the left and right axles 3A and 3B while distributing the driving rotation input from the second gear 52 to the differential case 61 to the left and right axles 3A and 3B.
The differential case 61 includes a spherical differential case body 61a that houses the differential pinion shaft 62, the differential pinion gear 63, and the left and right side gears 64A, 64B, an input plate 61B that extends in the radial direction from the outer peripheral portion of the differential case body 61a and is mechanically connected to the second gear 52, and left and right extending portions 61c, 61d that extend in the axial direction from both side portions of the differential case body 61 a. One of the extending portions 61c rotatably supports the left axle 3A on the inner peripheral portion, and rotatably supports the outer peripheral portion on the pinion carrier 54 via a bearing 65. The other extending portion 61d rotatably supports the right axle 3B on the inner peripheral portion, and rotatably supports the outer peripheral portion on the end wall 42a of the second housing 42 via a bearing 66. The bearing 66 is supplied with the lubricating oil of the reservoir 44 that is splashed up with the rotation of the second gear 52, thereby maintaining the lubricating performance.
The differential pinion shaft 62 is supported by a differential case body 61a in a direction orthogonal to the axles 3A and 3B, and two differential pinion gears 63 including bevel gears (below gears) are rotatably supported inside the differential case body 61 a. That is, the differential pinion shaft 62 allows the rotation of the differential pinion gear 63 while revolving the differential pinion gear 63 in accordance with the rotation of the differential case 61.
The left and right side gears 64A, 64B include bevel gears, are rotatably supported inside the differential case body 61a so as to mesh with the differential pinion gear 63 from both sides, and are mechanically connected to the left and right axles 3A, 3B via connecting elements such as splines. In a state where the differential pinion gear 63 revolves without rotating, for example, during straight traveling, the left and right side gears 64A and 64B rotate at a constant speed, and the driving rotation is transmitted to the left and right axles 3A and 3B. During cornering or during left-right cornering, the differential pinion 63 rotates to rotate the left and right side gears 64A and 64B relative to each other, and a difference in rotation between the left and right axles 3A and 3B is allowed.
The left axle 3A has one end rotatably supported by a bearing 26 provided on an end wall 41a of the first casing 41, and the other end rotatably supported by an extending portion 61c of the differential casing 61. A conductive portion 70, which will be described later, is provided between the left axle 3A and the end wall 41a at a position further outward than the bearing 26. A conductive portion 70, which will be described later, is also provided between the right axle 3B and the end wall 42 a.
In the power unit 1 configured as described above, a noise current generated by the inverter INV that controls the motor 2 may be transmitted to the left and right axles 3A and 3B, and the left and right axles 3A and 3B may serve as antennas to radiate radio noise. Therefore, measures against radio noise are taken for the power unit 1. Hereinafter, measures of the power unit 1 against radio noise will be described.
[ measures against radio noise ]
As shown in fig. 2, in the power unit 1, conductive portions 70 having conductivity are provided between the left axle 3A and the end wall 41a of the housing 4 and between the right axle 3B and the end wall 42a of the housing 4. The conductive portion 70, by its own conductivity, feeds back the noise current transmitted to the left axle 3A or the right axle 3B to the housing 4, thereby suppressing the radiated noise from the left and right axles 3A, 3B. In the following description, the conductive portion 70 provided between the right axle 3B and the end wall 42a of the housing 4 will be described in detail, and the conductive portion 70 provided between the left axle 3A and the end wall 41a of the housing 4 having the same configuration will not be described in detail.
As shown in fig. 3, the conductive portion 70 includes an inner oil seal (oil seal)71 and an outer oil seal 72 disposed at a distance between the end wall 42a of the housing 4 and the right axle 3B, a conductive grease 73 sealed in a space between the inner oil seal 71 and the outer oil seal 72, and a pair of outer-peripheral-side conductive members 74 and inner-peripheral-side conductive members 75 provided in the conductive grease 73.
The inner oil seal 71 is a so-called two-fluid separation type oil seal, and is disposed close to the bearing 66. The inner oil seal 71 includes: a core rod (cored bar)91 having a substantially T-shape; an elastic member 92 covering the core rod 91 and including a pair of main lips (lip)92a and 92b arranged to sandwich the core rod 91; and a pair of chucking springs 93a and 93b attached to outer peripheral surfaces of the main lips 92a and 92b, respectively. The inner oil seal 71 is fastened to the right axle 3B in the radial direction by the clamp springs 93a and 93B, respectively, and the main lips 92a and 92B are fastened to the right axle 3B in the radial direction.
The outer oil seal 72 includes a substantially L-shaped core rod 94, an elastic member 95 covering the core rod 94 and including a main lip 95a and a sub lip 95b, and a garter spring 96 attached to the outer peripheral surface of the main lip 95a, and is disposed at a position axially outward of the inner oil seal 71. In the outer oil seal 72, the main lip 95a is fastened to the right axle 3B in the radial direction by the garter spring 96.
Here, by providing the inner oil seal 71 as a two-fluid separation type oil seal, it is possible to prevent the lubricating oil of the reservoir 44 that is splashed up along with the rotation of the second gear 52 from being mixed with the conductive grease 73 through the bearing 66. This can suppress deterioration of the conductive performance of the conductive portion 70.
In the conductive grease 73, the outer peripheral side conductive member 74 provided on the end wall 42a and the inner peripheral side conductive member 75 provided on the right axle 3B are arranged so as to face each other in the radial direction with a small gap interposed therebetween. The outer-peripheral-side conductive member 74 and the inner-peripheral-side conductive member 75 are each a circlip (circlip) made of copper.
By making both the outer peripheral side conductive member 74 and the inner peripheral side conductive member 75 of copper with high conductivity, it is possible to more reliably transmit the noise current from the right axle 3B to the housing 4. Further, by using the circlips for both the outer peripheral side conductive member 74 and the inner peripheral side conductive member 75, the grooves provided in the end wall 42a and the right axle 3B can be easily fitted to each other, and the assembly is facilitated.
The present invention is not limited to the above-described embodiments, and modifications, improvements, and the like may be appropriately made.
The power unit 1 may employ a forced lubrication system using an oil pump instead of or in addition to the splash lubrication system.
In the present specification, at least the following matters are described. In the above embodiments, the corresponding components and the like are shown in parentheses, but the present invention is not limited to these.
(1) A power plant (power plant 1) comprising:
a motor (electric motor 2) that drives a left wheel (left wheel WL) and a right wheel (right wheel WR) of a vehicle (vehicle V);
a motor control device (inverter INV) for controlling the motor;
a transmission (transmission 5) disposed on a power transmission path between the electric motor and the left and right wheels;
a differential device (differential device 6) that distributes an output decelerated by the transmission to the left wheel and the right wheel;
a case (case 4) that houses the electric motor, the transmission, and the differential device;
a left axle (left axle 3A) having one end connected to the differential device and the other end extending from the housing and connected to the left wheel; and
a right axle (right axle 3B) having one end connected to the differential device and the other end extending from the housing and connected to the right wheel; and is
A conductive portion (conductive portion 70) having conductivity is provided between the housing and at least one of the left and right axles,
the conductive part includes conductive grease (conductive grease 73) and a pair of conductive members (outer-peripheral-side conductive member 74 and inner-peripheral-side conductive member 75) provided in the conductive grease,
one of the pair of conductive members (outer peripheral side conductive member 74) is fixed to the housing,
the other of the pair of conductive members (inner peripheral side conductive member 75) is fixed to the axle so as to face one of the conductive members in the radial direction.
According to (1), in which the conductive portion having conductivity is provided between the housing and the axle, it is possible to prevent noise generated by the motor control device from being radiated. Further, since the rotation of the axle is decelerated by the speed reducer, the influence of the frictional force can be reduced. Further, by using conductive grease and a pair of conductive members both having conductivity in the conductive portion, it is possible to reliably transmit the noise current from the axle to the housing.
(2) The power plant according to (1), wherein
The conductive portion further includes a first oil seal (inner oil seal 71) and a second oil seal (outer oil seal 72) disposed in a spaced relationship between the housing and the axle,
the conductive grease and the pair of conductive members are disposed in a space between the first oil seal and the second oil seal.
According to (2), since the conductive portion further includes the first oil seal and the second oil seal disposed at a distance between the housing and the axle, and the conductive grease and the pair of conductive members are disposed in the space between the first oil seal and the second oil seal, it is possible to prevent the lubricating oil in the housing from being mixed with the conductive oil seal, and it is possible to suppress deterioration of the conductive performance of the conductive portion.
(3) The power plant according to (1) or (2), wherein
The pair of conductive members is made of copper.
According to (3), since one of the pair of conductive members is made of copper having high conductivity, the noise current can be more reliably transmitted from the axle to the housing.
(4) The power plant according to any one of (1) to (3), wherein
The pair of conductive members are snap springs.
According to (4), the pair of conductive members are snap springs, and therefore, the assembly can be easily performed.
Claims (4)
1. A power plant, comprising:
a motor that drives a left wheel and a right wheel of a vehicle;
a motor control device that controls the motor;
a speed reducer disposed on a power transmission path between the motor and the left and right wheels;
a differential device that distributes output shifted by the speed reducer to the left wheel and the right wheel;
a housing that houses the motor, the speed reducer, and the differential device;
a left axle having one end connected to the differential device and the other end extending from the housing and connected to the left wheel; and
a right axle having one end connected to the differential device and the other end extending from the housing and connected to the right wheel; and is
A conductive portion having conductivity is provided between the housing and at least one of the left and right axles,
the conductive portion includes conductive grease and a pair of conductive members provided in the conductive grease,
one of the pair of conductive members is fixed to the housing,
the other of the pair of conductive members is fixed to the axle so as to be opposed to the one of the conductive members in a radial direction.
2. The power plant of claim 1,
the conductive portion further includes a first oil seal and a second oil seal disposed at a distance between the housing and the axle,
the conductive grease and the pair of conductive members are disposed in a space between the first oil seal and the second oil seal.
3. The power plant according to claim 1 or 2,
the pair of conductive members is made of copper.
4. The power plant according to claim 1 or 2,
the pair of conductive members are snap springs.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018039133A JP6994414B2 (en) | 2018-03-05 | 2018-03-05 | Power unit |
| JP2018-039133 | 2018-03-05 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210062673U true CN210062673U (en) | 2020-02-14 |
Family
ID=67947935
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920245450.5U Active CN210062673U (en) | 2018-03-05 | 2019-02-27 | Power plant |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP6994414B2 (en) |
| CN (1) | CN210062673U (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023162676A1 (en) | 2022-02-24 | 2023-08-31 | Nok株式会社 | Sealing device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2559158Y2 (en) * | 1993-04-09 | 1998-01-14 | 内山工業株式会社 | Sealing device |
| JP2000310296A (en) | 1999-04-23 | 2000-11-07 | Aisin Aw Co Ltd | Drive device for electric vehicle |
-
2018
- 2018-03-05 JP JP2018039133A patent/JP6994414B2/en active Active
-
2019
- 2019-02-27 CN CN201920245450.5U patent/CN210062673U/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| JP6994414B2 (en) | 2022-01-14 |
| JP2019151268A (en) | 2019-09-12 |
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