CN214689027U

CN214689027U - Power driving device and electric automobile

Info

Publication number: CN214689027U
Application number: CN202022996859.6U
Authority: CN
Inventors: 凌和平; 翟震; 胡磊; 陈龙; 熊雨超
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2020-12-14
Filing date: 2020-12-14
Publication date: 2021-11-12
Anticipated expiration: 2030-12-14

Abstract

The utility model belongs to the technical field of the car drive, especially, relate to a power drive device and electric automobile. The power driving device comprises a bearing, a motor assembly, a clutch assembly and a mounting disc for mounting the clutch assembly; the mounting disc comprises a disc body connected with the clutch assembly, a convex shaft mounted on the disc body, and a through hole penetrating through the convex shaft and coaxially arranged with the convex shaft; a bearing hole is arranged on the motor assembly; the protruding shaft is rotatably arranged in the bearing hole through a bearing, and an output shaft of the motor assembly penetrates through the through hole to be connected with the disc body. The utility model discloses in, clutch assembly and output shaft can produce axial force and radial force at the in-process that combines and separate, and this axial force and radial force can transmit extremely the bearing to protect motor assembly's motor output shaft effectively, prolonged motor assembly's life.

Description

Power driving device and electric automobile

Technical Field

The utility model belongs to the technical field of the car drive, especially, relate to a power drive device and electric automobile.

Background

With the continuous development of battery technology, electric automobiles have become an important component in vehicles. The power driving device can transmit the rotating speed of the motor to the wheels of the automobile through the transmission, and the advantages and disadvantages of the power driving device influence the dynamic performance and NVH performance of the electric automobile. In the prior art, the structure of a transmission system of an electric automobile is complex, and an output shaft of the transmission system in the prior art needs to bear axial force and radial force caused by a clutch assembly and the like, so that an output shaft of a motor is easy to damage, and when the electric automobile runs at a high speed, the NVH performance of the automobile can be adversely affected.

Disclosure of Invention

The utility model discloses technical problem such as NVH performance to the structure complicacy that power drive exists among the prior art, influence car provides a power drive and electric automobile.

In view of the above technical problem, an embodiment of the present invention provides a power driving device, including a bearing, a motor assembly, a clutch assembly, and a mounting plate for mounting the clutch assembly, where the mounting plate includes a plate body connected to the clutch assembly, a protruding shaft mounted on the plate body, and a through hole penetrating through the protruding shaft and coaxially disposed with the protruding shaft; a bearing hole is formed in the motor assembly; the protruding shaft is rotatably installed in the bearing hole through the bearing, and an output shaft of the motor assembly penetrates through the through hole to be connected with the disc body.

Optionally, a first stop shoulder is arranged on the protruding shaft, and a second stop shoulder is arranged on the inner wall of the bearing hole; and the two opposite ends of the bearing positioned in the bearing hole are respectively abutted against the first retaining shoulder and the second retaining shoulder.

Optionally, the clutch assembly comprises a friction disc and a clutch cover plate connected to the mounting disc; a mounting space for mounting the friction disc is formed between the mounting disc and the clutch cover plate; the output shaft penetrates through the through hole and is connected with the friction disc.

Optionally, a first mounting hole is formed in the tray body, a second mounting hole is formed in a position, opposite to the first mounting hole, of the first blocking shoulder, and the protruding shaft is mounted on the tray body through a connecting piece penetrating through the first mounting hole and the second mounting hole.

Optionally, an output shaft of the motor assembly is provided with a first spline; a second spline matched with the first spline is arranged on the inner side wall of the through hole; the output shaft is connected with the protruding shaft through the first spline and the second spline which are in adaptive connection.

Optionally, a plane of the plate body facing away from the protruding shaft is provided with a friction plane in friction connection with the friction disc, and the clutch assembly further includes a diaphragm spring mounted on the clutch cover plate, wherein the diaphragm spring is used for abutting the friction disc against the friction plane so as to enable the clutch assembly to be combined.

Optionally, the motor shell is concavely provided with a mounting groove for mounting the mounting disc; the bottom protrusion of mounting groove is provided with connecting portion, the dead eye sets up on the connecting portion.

Optionally, a plurality of reinforcing ribs are connected between the outer side wall of the connecting portion and the bottom of the mounting groove, and the plurality of reinforcing ribs are arranged at intervals along the circumferential direction of the connecting portion.

The embodiment of the invention also provides an electric automobile which is characterized by comprising the power driving device.

Optionally, a box closing surface for connecting an automobile transmission is arranged on the motor shell; a plurality of first fixing holes are formed in the box closing surface, and a plurality of second fixing holes are formed in the automobile transmission; the automobile transmission is connected to the box closing surface through fixing pieces, two ends of each fixing piece are respectively inserted into the first fixing hole and the second fixing hole.

In the utility model, the mounting disc comprises a disc body connected with the clutch assembly, a protruding shaft mounted on the disc body, and a through hole penetrating through the protruding shaft and coaxially arranged with the protruding shaft; a bearing hole is formed in the motor assembly; the protruding shaft is rotatably installed in the bearing hole through the bearing, and the output shaft of the motor assembly penetrates through the through hole to be connected with the disc body. Axial force and radial force generated in the process of combining and separating the clutch assembly and the output shaft are transmitted to the bearing (and cannot be directly born by the output shaft), so that the motor output shaft of the motor assembly is effectively protected, and the service life of the motor assembly is prolonged. Additionally, the utility model discloses in, the output shaft passes the through-hole of mounting disc is connected the disk body, consequently, the utility model discloses a cantilever structure of output shaft is short, and the radial run-out of clutch assembly is little, compare in output shaft lug connection the structure of clutch assembly, the utility model discloses can reduce electric automobile's vibration and noise effectively, improve this power drive's life and electric automobile's NVH performance.

Drawings

The present invention will be further explained with reference to the drawings and examples.

Fig. 1 is an exploded schematic view of a power driving device according to an embodiment of the present invention;

fig. 2 is a schematic view of an assembly structure of a power driving device according to an embodiment of the present invention;

fig. 3 is a cross-sectional view of a power driving apparatus according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a mounting plate of a power driving device according to an embodiment of the present invention;

fig. 5 is a schematic structural view of a mounting plate of a power driving device according to another embodiment of the present invention;

fig. 6 is a schematic structural diagram of a power driving apparatus according to an embodiment of the present invention when connected to an automotive transmission.

The reference numerals in the specification are as follows:

1. a bearing; 2. a motor assembly; 21. a motor housing; 211. a bearing bore; 212. mounting grooves; 213. a connecting portion; 214. reinforcing ribs; 215. a box closing surface; 216. a first fixing hole; 22. an output shaft; 3. a clutch assembly; 31. a friction disk; 32. a clutch cover plate; 33. an installation space; 4. mounting a disc; 41. a tray body; 411. a first mounting hole; 42. a protruding shaft; 421. a first catch shoulder; 4211. a second mounting hole; 43. a through hole; 5. a transmission for a vehicle.

Detailed Description

In order to make the technical problem, technical solution and advantageous effects solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

It is to be understood that the terms "upper", "lower", "left", "right", "front", "rear", "middle", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the present invention.

As shown in fig. 1, a power driving apparatus according to an embodiment of the present invention includes a bearing 1, a motor assembly 2, a clutch assembly 3, and a mounting plate 4 for mounting the clutch assembly 3; the mounting plate 4 includes a plate body 41 connected to the clutch assembly 3, a protruding shaft 42 mounted (screwed or the like) on the plate body 41, and a through hole 43 penetrating the protruding shaft 42 and provided coaxially with the protruding shaft 42; the motor assembly 2 (i.e. the motor housing 21) is provided with a bearing hole 211; the protruding shaft 42 is rotatably mounted in the bearing hole 211 through the bearing 1, and the output shaft 22 of the motor assembly 2 passes through the through hole 43 and is connected to the disc 41. It can be understood that the inner ring of the bearing 1 is in interference fit with the outer wall of the protruding shaft 42, and the outer ring of the bearing 1 is in interference fit with the inner wall of the bearing hole 211, so as to realize the rotational connection between the mounting disc 4 and the motor housing 21. Specifically, the through hole 43 passes through the protruding shaft 42 and the disc body 41 in this order.

Further, the end surface of the mounting plate 4 away from the motor assembly 2 is provided with the clutch assembly 3, and the output shaft 22 passes through the through hole 43 to be connected with the clutch assembly 3, so that the motor assembly 2 is selectively connected with or disconnected from the clutch assembly 3 through the mounting plate 4; specifically, the output shaft 22 of the motor assembly 2 drives the disc 41 to rotate, and the disc 41 selectively drives the clutch assembly 3 to rotate (i.e. the clutch assembly 3 is combined with or separated from the disc 41), so as to realize the speed change and power separation of the vehicle.

In the present invention, the motor assembly 2 includes a motor housing 21 and an output shaft 22; the mounting plate 4 comprises a plate body 41, a protruding shaft 42 mounted on the plate body 41, and a through hole 43 penetrating the protruding shaft 42 and coaxially arranged with the protruding shaft 42; a bearing hole 211 is formed in the motor housing 21; the protruding shaft 42 is rotatably mounted in the bearing hole 211 through the bearing 1, and the output shaft 22 passes through the through hole 43 and is connected to the clutch assembly 3. Axial force and radial force generated by the clutch assembly 3 and the output shaft 22 in the process of combining and separating are transmitted to the bearing 1 (and are not directly borne by the output shaft 22), so that the motor output shaft 22 of the motor assembly 2 is effectively protected, and the service life of the motor assembly 2 is prolonged. Additionally, in the utility model discloses, output shaft 22 passes through the through-hole 43 of mounting disc 4 is connected disk body 41, therefore, the utility model discloses an output shaft 22's cantilever structure is short, clutch assembly 3's runout is little, compare in output shaft 22 lug connection clutch assembly 3's structure, the utility model discloses can reduce electric automobile's vibration and noise effectively, improve this power drive's life and electric automobile's NVH performance.

In an embodiment, as shown in fig. 4 and 5, a first stop shoulder 421 is disposed on the protruding shaft 42, and a second stop shoulder (not shown) is disposed on an inner wall of the bearing hole 211; the two opposite ends of the bearing 1 located in the bearing hole 211 are respectively abutted to the first retaining shoulder 421 and the second retaining shoulder. As can be understood, when the inner and outer races of the bearing 1 are mounted on the protruding shaft 42 and the bearing hole 211, respectively, opposite ends of the bearing 1 abut against the first shoulder and the second shoulder, respectively; therefore, the first shaft shoulder and the second shaft shoulder can prevent the bearing 1 from axially moving on the protruding shaft 42, so that the vibration and noise of the electric automobile are effectively reduced, the service life of the power driving device is prolonged, and the NVH performance of the electric automobile is improved.

In an embodiment, as shown in fig. 5, a first mounting hole 411 is formed on the tray body 41, a second mounting hole 4211 is formed on the first blocking shoulder 421 at a position opposite to the first mounting hole 411, and the protruding shaft 42 is mounted on the tray body through a connector passing through the first mounting hole 411 and the second mounting hole 4211. It is understood that the connectors include, but are not limited to, bolts, etc.; specifically, the first mounting hole and the second mounting hole are both threaded holes, and the connecting piece is a bolt; the protruding shaft is fixedly connected to the disc body 41 through a connecting piece inserted into the first mounting hole 411 and the second mounting hole 4211; at the moment, the mounting plate 4 is of a split structure, the manufacturing is simple, and the manufacturing cost of the power driving device is reduced.

Preferably, as shown in fig. 4, the protruding shaft 42 and the disk body 41 are formed integrally, and the strength and rigidity of the mounting disk 4 formed integrally are greater.

In one embodiment, as shown in fig. 1, the clutch assembly 3 includes a friction plate 31 and a clutch cover plate 32 connected to the mounting plate 4; a mounting space 33 for mounting the friction disc 31 is formed between the mounting disc 4 and the clutch cover plate 32; the output shaft 22 is connected to the friction disc 31 through the through hole 43. It is understood that the friction disc 31 is installed in the installation space 33, the motor output shaft 22 can drive the friction disc 31 to rotate in the installation space 33, and the rotation of the friction disc 31 can drive the automobile transmission 5 to rotate, so as to drive the automobile wheels to rotate. The utility model discloses in, installation space 33's design has further improved this power drive's compactedness, has reduced this power drive's installation space 33 on the car.

In one embodiment, as shown in fig. 1, the output shaft 22 of the motor assembly 2 is provided with a first spline (not shown); a second spline (not shown) adapted to the first spline is arranged on the through hole 43; the output shaft 22 is connected to the protruding shaft by the first spline and the second spline. Optionally, the first spline is an external spline, and the second spline is an internal spline; when the output shaft 22 is connected to the protruding shaft, the first spline is inserted into the second spline. Further, the friction disc 31 is further provided with a male connecting portion (e.g., male spline, etc.), an input shaft of the automobile transmission 5 connected with the friction disc 31 is provided with a female connecting portion (e.g., female spline, etc.), and the input shaft of the automobile transmission 5 is connected with the friction disc 31 through the male connecting portion inserted into the female connecting portion; it is understood that, when the internal spline and the external spline are inserted into each other, the internal spline and the external spline are fixedly connected by a fixing member (a screw, a bolt, or the like) inserted into the motor output shaft 22 through the protruding shaft, so that the motor output shaft 22 and the protruding shaft are fixedly connected by the internal spline and the external spline in the radial direction and fixedly connected by the fixing member in the axial direction. The utility model discloses in, this power drive's simple structure, simple to operate connects closely, can reduce electric automobile's vibration and noise effectively, has improved this power drive's life and electric automobile's NVH performance.

In an embodiment, a plane of the plate body 41 facing away from the protruding shaft 42 is provided with a friction plane 412 frictionally connected to the friction disc 31, and the clutch assembly 3 further includes a diaphragm spring (not shown) mounted on the clutch cover 32, the diaphragm spring being used for abutting the friction disc 31 on the friction plane 412 to couple the clutch assembly 3. It will be appreciated that the diaphragm spring is located between the clutch cover 32 and the friction disc 31 for moving the friction disc 31 toward or away from the friction plane 412.

Specifically, when the clutch assembly 3 needs to be coupled, the diaphragm spring is compressed, and at this time, the friction disc 31 is pushed toward the disc body 41 under the elastic force of the diaphragm spring, so that the friction disc 31 abuts against the friction plane 412, at this time, the output shaft 22 of the motor assembly 2 drives the rotation of the disc body 41, the rotation of the disc body 41 generates a friction force between the friction surface 412 and the friction disc 31, and the friction force drives the friction disc 31 to rotate, so that the rotation of the friction disc 31 is transmitted to the automobile transmission 5 through the male connecting portion of the female connecting portion and drives the automobile transmission 5 to rotate, and thus, the coupling function of the clutch assembly 3 is realized.

When the clutch assembly 3 needs to be disconnected, the diaphragm spring is stretched, and at this time, under the pulling force of the diaphragm spring, the friction disc 31 moves in a direction away from the disc body 41, so that the friction disc 31 is separated from the friction surface 412, and thus, the rotation of the disc body 41 will not drive the friction disc 31 and the automobile transmission 5 to rotate, and the function of disconnecting the clutch of the clutch assembly 3 is realized. The utility model discloses in, this power drive's simple structure, control is convenient.

In one embodiment, as shown in fig. 1 and 2, the motor assembly 2 (i.e., the motor housing 21) is recessed to form a mounting groove 212 for mounting the mounting plate 4; the bottom of the mounting groove 212 is provided with a connection part 213 in a protruding manner, and the bearing hole 211 is provided on the connection part 213. It can be understood that the design of the mounting groove 212 can make one end of the mounting plate 4 mounted into the mounting groove 212, thereby making the structure of the power driving device more compact. In addition, the arrangement of the connecting part 213 further reduces the cantilever length of the output shaft 22 of the motor assembly 2, and can effectively reduce the vibration and noise of the electric automobile; the design of the reinforcing ribs 214 enhances the strength and rigidity of the motor housing 21, and prolongs the service life of the power drive device.

In one embodiment, as shown in fig. 1, a plurality of ribs 214 are connected between an outer side wall of the connecting portion 213 and a bottom of the mounting groove 212, and the plurality of ribs 214 are spaced apart from each other in a circumferential direction of the connecting portion 213. It is understood that the connecting portion 213 protrudes toward one end of the mounting plate 4 on the end surface of the motor housing 21, and the ribs 214 are connected between the outer wall of the connecting ring and the end surface of the motor housing 21 in the circumferential direction of the connecting portion 213; and the number of the reinforcing ribs 214 can be more than 12, 16, 20 and the like according to actual requirements. The design of the reinforcing ribs 214 enhances the strength and rigidity of the motor housing 21, and prolongs the service life of the power drive device.

The invention further provides an electric automobile and the power driving device.

In one embodiment, as shown in fig. 1 and 6, the motor assembly 2 (i.e., the motor housing 21) is provided with a mold closing surface 215 for connecting the transmission 5 of the vehicle. It is understood that, when the power drive device is connected to the transmission 5, the box closing surface 215 and the box body of the transmission 5 can be connected by a fixing member such as a bolt. The utility model discloses in, be equipped with the mould assembling face 215 of connecting automotive transmission 5 on the motor casing 21 to make this power drive device's structure compacter, intensity is higher.

Preferably, a plurality of first fixing holes 216 are formed in the box closing surface 215, and a plurality of second fixing holes are formed in the automobile transmission 5; the transmission 5 is connected to the box closing surface 215 by fasteners having both ends inserted into the first fixing hole 216 and the second fixing hole, respectively. It is to be understood that the first fixing hole 216 and the second fixing hole are both threaded holes, and the fixing member is a bolt, so that the connection of the vehicle transmission 5 to the motor housing 21 is achieved by screwing the first fixing hole 216 and the second fixing hole. The utility model discloses in, this power drive and automotive transmission 5's connection is simple.

The above description is only an example of the power driving device of the present invention, and should not be construed as limiting the present invention, and any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A power driving device is characterized by comprising a bearing, a motor assembly, a clutch assembly and a mounting disc for mounting the clutch assembly; the mounting disc comprises a disc body connected with the clutch assembly, a protruding shaft mounted on the disc body, and a through hole penetrating through the protruding shaft and coaxially arranged with the protruding shaft; a bearing hole is formed in the motor assembly; the protruding shaft is rotatably installed in the bearing hole through the bearing, and an output shaft of the motor assembly penetrates through the through hole to be connected with the disc body.

2. The power drive of claim 1, wherein a first stop shoulder is provided on said protruding shaft and a second stop shoulder is provided on an inner wall of said bearing bore; and the two opposite ends of the bearing positioned in the bearing hole are respectively abutted against the first retaining shoulder and the second retaining shoulder.

3. The power drive of claim 2, wherein the plate body has a first mounting hole, the first shoulder has a second mounting hole opposite to the first mounting hole, and the protruding shaft is mounted on the plate body by a connector passing through the first mounting hole and the second mounting hole.

4. The power drive of claim 1, wherein said clutch assembly includes a friction disc and a clutch cover plate coupled to said mounting disc; a mounting space for mounting the friction disc is formed between the mounting disc and the clutch cover plate; the output shaft penetrates through the through hole and is connected with the friction disc.

5. The power drive of claim 4, wherein the output shaft of the motor assembly is provided with a first spline; a second spline matched with the first spline is arranged on the inner side wall of the through hole; the output shaft is connected with the protruding shaft through the first spline and the second spline.

6. The power drive of claim 4, wherein a flat surface of said plate facing away from said protruding shaft defines a friction flat surface for frictionally engaging said friction disc, said clutch assembly further comprising a diaphragm spring mounted to said clutch cover, said diaphragm spring adapted to urge said friction disc against said friction flat surface to engage said clutch assembly.

7. The power drive of claim 1, wherein the motor assembly is recessed to form a mounting slot for mounting the mounting plate; the bottom protrusion of mounting groove is provided with connecting portion, the dead eye sets up on the connecting portion.

8. The power drive of claim 7, wherein a plurality of ribs are connected between the outer side wall of the connecting portion and the bottom of the mounting groove, and the plurality of ribs are arranged at intervals in the circumferential direction of the connecting portion.

9. An electric vehicle characterized by comprising the power drive device according to any one of claims 1 to 8.

10. The electric automobile as claimed in claim 9, wherein the motor assembly is provided with a box closing surface for connecting with an automobile transmission; a plurality of first fixing holes are formed in the box closing surface, and a plurality of second fixing holes are formed in the automobile transmission; the automobile transmission is connected to the box closing surface through fixing pieces, two ends of each fixing piece are respectively inserted into the first fixing hole and the second fixing hole.