Speed reducer assembly

Abstract

The speed reducer assembly comprises a motor and a speed reducer, a speed reducer shell of the speed reducer comprises a left shell body relatively close to the motor and a right shell body relatively far away from the motor, and the left shell body is a casting part; the left shell is provided with a first plate part, a second plate part protruding towards the motor side from the first plate part, a spigot part protruding towards the motor side from the second plate part, a motor shell connecting hole used for being connected with a motor shell of the motor and a speed reducer shell connecting hole used for being connected with a speed reducer shell, the motor shell connecting hole is formed in the second plate part, and the speed reducer shell connecting hole is formed in the first plate part. When the speed reducer needs to be matched with different motors, only the left shell needs to be replaced, the right shell does not need to be replaced, molds for correspondingly forming the first plate part and the structure of the side, away from the motor, of the first plate part can be shared for different left shells, and only molds for correspondingly forming the second plate part and the structure of the side, close to the motor, of the second plate part need to be replaced. And the production flexibility of the speed reducer assembly is improved, and the production cost of the speed reducer assembly is reduced.

Description

Technical Field

[0001] The present application relates to the field of automobile technology, and in particular to a reducer assembly. Background Art

[0002] The reducer assembly is an important assembly of the car, generally including the motor, reducer and differential, the three are connected by transmission, and the housing of the motor is fixedly connected with the housing of the reducer. When working, the rotor shaft of the motor drives the primary driving gear shaft of the reducer to rotate, drives the primary passive gear to rotate, drives the secondary driving gear shaft to rotate, drives the secondary passive gear to rotate, drives the housing of the differential to rotate, and finally the power is transmitted to the wheels through the half-axle gears of the differential.

[0003] The shell interface sizes of motors supplied by different manufacturers are often different. At present, for reducer assembly manufacturers, if the motor supplier is changed, the reducer shell needs to be modified to a large extent, resulting in high production costs. In view of this, how to make the same specification reducer match different motors without too much modification is a technical problem that needs to be solved by technical personnel in this field. Utility Model Content

[0004] In order to solve the above technical problems, the present application provides a reducer assembly, which includes a motor and a reducer, and the reducer housing includes a left housing relatively close to the motor and a right housing relatively far away from the motor, the left housing and the right housing are connected by bolts, the left housing is a casting, the left housing has a first plate portion, a second plate portion protruding from the first plate portion toward the motor side, a motor stop portion protruding from the second plate portion toward the motor side, a motor connecting hole for connecting the motor, and a right housing connecting hole for connecting the right housing, the motor connecting hole is arranged on the second plate portion, and the right housing connecting hole is arranged on the first plate portion.

[0005] An embodiment of the reducer assembly, the left shell has a first annular protrusion protruding from the first plate portion toward the right shell side, the first-stage driving gear shaft of the reducer corresponds to a first-stage left bearing, a first-stage left bearing mounting hole is formed in the first annular protrusion, the left shell also has an oil seal hole for installing an oil seal, the inner circumference of the oil seal cooperates with the rotor shaft of the motor or cooperates with the first-stage driving gear shaft of the reducer to achieve sealing, the oil seal hole is located on the side of the first-stage left bearing hole close to the motor, and the oil seal hole, the first-stage left bearing hole and the motor stop portion are coaxial.

[0006] In one implementation manner of the reducer assembly, the motor housing includes a housing barrel, and the left housing covers the right end of the housing barrel.

[0007] An implementation of the reducer assembly, the motor housing includes a left end cover, and the left end cover seals the left end of the housing cylinder; alternatively, the reducer assembly includes a motor controller, and the housing of the motor controller seals the left end of the housing cylinder.

[0008] An implementation of the reducer assembly, the rotor shaft of the motor is connected to the first-stage driving gear shaft of the reducer through a spline, and the spline connection position is located inside the reducer housing.

[0009] An implementation of the reducer assembly, the rotor shaft of the motor is provided with an external spline and a positioning circumferential surface is provided on the left side of the external spline, the first-stage driving gear shaft of the reducer is provided with an internal spline and a positioning round hole is provided on the left side of the internal spline, and the positioning round hole and the positioning circumferential surface cooperate with each other to limit the coaxiality of the rotor shaft of the motor and the first-stage driving gear shaft of the reducer.

[0010] An implementation of the reducer assembly, the first-stage driving gear shaft of the reducer corresponds to a first-stage left bearing and a first-stage right bearing, the first-stage left bearing is installed in the first-stage left bearing hole, the first-stage right bearing is installed in the first-stage right bearing hole, the inner ring and the outer ring of the first-stage left bearing are axially limited on both sides, the inner ring and the outer ring of the first-stage right bearing are axially limited on one side, and the tooth part of the first-stage driving gear shaft is arranged close to the first-stage right bearing.

[0011] An implementation of the reducer assembly, the right housing is provided with a process hole, and a top hole is provided at the center of the right end face of the rotor shaft of the motor. During assembly, the tooling rod can pass through the process hole and press against the top hole, and the reducer housing further includes a sealing cover for sealing the process hole.

[0012] An implementation of the reducer assembly, the first-stage driving gear shaft of the reducer corresponds to a first-stage right bearing, the second-stage driving gear shaft of the reducer corresponds to a second-stage right bearing, the reducer assembly further includes a differential, the differential housing corresponds to a differential left bearing and a differential right bearing, and the right housing is provided with a first-stage right bearing installation hole, a second-stage right bearing installation hole, a differential left bearing installation hole and a differential right bearing installation hole.

[0013] An implementation of the reducer assembly, the differential housing is connected to the second-stage driven gear through bolts, the differential housing is provided with threaded holes for connecting the bolts, the second-stage driven gear is provided with through holes for connecting the bolts, and a part of the second-stage driven gear is clamped between the outer housing of the differential and the head of the bolt.

[0014] For the speed reducer assembly provided by the present application, when the speed reducer needs to be matched with different motors, only the left housing needs to be replaced, instead of the right housing. Moreover, for different left housings, the molds for forming the first plate portion and the structure on the side of the first plate portion away from the motor can be shared, and only the molds for forming the second plate portion and the structure on the side of the second plate portion close to the motor need to be replaced. Therefore, the production flexibility of the speed reducer assembly is increased, and the production cost of the speed reducer assembly is reduced. Brief Description of the Drawings

[0015] Figure 1 Is a perspective view of an embodiment of the speed reducer assembly provided by the present application;

[0016] Figure 2 Is Figure 1 The sectional view of;

[0017] Figure 3 Is Figure 2 The partial enlarged view of;

[0018] Figure 4 Is Figure 1 The perspective view of the left housing in;

[0019] Figure 5 Is Figure 1 The perspective view of the left housing in another view;

[0020] Figure 6 Is Figure 1 The perspective view of the right housing in;

[0021] Figure 7 Is Figure 1 The perspective view of the secondary gear assembly of the speed reducer in;

[0022] Figure 8 Is Figure 1 The assembly sequence diagram of;

[0023] Figure 9 Is a perspective view of another embodiment of the speed reducer assembly provided by the present application;

[0024] Figure 10 Is Figure 8 The sectional view of the speed reducer and the differential in.

[0025] The description of the reference numerals is as follows:

[0026] 1 Motor, 11 Housing cylinder, 12 Left end cover, 13 Rotor, 14 Stator, 15 Rotor shaft, 16 Left bearing of the rotor shaft;

[0027] 2 Reducer, 21 Left housing, 21a First plate part, 21b Second plate part, 21c Motor mounting boss, 21d Motor connection hole, 21e Right housing connection hole, 21f Locating pin hole, 21g First annular convex part, 21h Second annular convex part, 22 Right housing, 23 First-stage driving gear shaft, 24 First-stage driven gear, 25 Second-stage driving gear shaft, 26 Second-stage driven gear, 27 Oil seal, 28a First retaining ring, 28b Second retaining ring, 28c Third retaining ring, 29 Gasket, 210 Cover, 211 First-stage left bearing, 212 First-stage right bearing, 213 Second-stage left bearing, 214 Second-stage right bearing 214;

[0028] 3 Differential, 31 Differential housing, 32 Differential left bearing, 33 Differential right bearing;

[0029] 4 Motor controller, 41 Housing;

[0030] 5 Bearing cover;

[0031] 6 Long bolt. Specific embodiments

[0032] This application provides a reducer assembly. To enable those skilled in the art to better understand the technical solutions of this application, the following further details this application in conjunction with the accompanying drawings and specific embodiments.

[0033] As Figure 1 and Figure 2 shown, in this embodiment, the reducer assembly includes a motor 1, a reducer 2, a differential 3, and a motor controller 4. Among them, the reducer housing of the reducer 2 includes a left housing 21 and a right housing 22, and the left housing 21 is closer to the motor 1 than the right housing 22. The left housing 21 is a casting. The right housing 22 can also be a casting. The motor housing of the motor 1 includes a shell cylinder 11. A water channel is provided inside the shell cylinder 11. The shell cylinder 11 can be an extruded profile, directly extruding the water channel, which has a lower cost compared to casting the water channel. The left housing 21 and the right housing 22 are connected by bolts. The left housing 21 covers the right end of the shell cylinder 11. The housing 41 of the motor controller 4 covers the left end of the shell cylinder 11. The left housing 21, the shell cylinder 11, and the housing 41 of the motor controller 4 are connected by long bolts 6. The housing 41 of the motor controller 4 and the left housing 21 respectively serve as the left and right end covers of the motor 1, so that there is no need to separately configure left and right end covers for the motor 1. Moreover, since the motor 1 and the motor controller 4 are integrated, there is no need to set up high-voltage three-phase lines connecting the motor controller 4 and the motor 1.

[0034] As Figure 4 and Figure 5As shown, in this embodiment, the left housing 21 has a first plate portion 21a, a second plate portion 21b protruding from the first plate portion 21a towards the motor 1 side, a motor stop portion 21c protruding from the second plate portion 21b towards the motor 1 side, a motor connection hole 21d for connecting the motor housing, a right housing connection hole 21e for connecting the right housing 22, a first annular convex portion 21g and a second annular convex portion 21h protruding from the first plate portion 21a towards the right housing 22 side. The motor housing connection hole is provided in the second plate portion 21b, and the right housing connection hole 21e is provided in the first plate portion 21a. To facilitate the positioning of the left housing 21 and the right housing 22, a positioning pin hole 21f can also be provided on the first plate portion 21a.

[0035] Since both the motor connection hole 21d and the motor stop portion 21c are provided in the left housing 21, when the reducer 2 needs to be matched with different motors 1, only the left housing 21 needs to be replaced, without replacing the right housing 22. Moreover, for different left housings 21, when casting, the molds corresponding to forming the first plate portion 21a and the structure on the side of the first plate portion 21a away from the motor 1 (such as the first annular convex portion 21g and the second annular convex portion 21h) can be shared, and only the molds corresponding to forming the second plate portion 21b and the structure on the side of the second plate portion 21b close to the motor 1 (such as the motor stop portion 21c) need to be replaced. Therefore, the production flexibility of the reducer assembly is increased, and the production cost of the reducer assembly is reduced. Moreover, since the left housing 21 and the right housing 22 are connected by bolts, the left housing 21 and the right housing 22 can be disassembled. After disassembly, as Figure 6 shown, the installation cavity opening on the left side of the right housing 22 is completely exposed. In this way, during assembly, the secondary drive gear shaft 25 and the secondary driven gear 26 of the reducer 2 can be assembled together first and ground to achieve better gear accuracy, and then the assembly of the secondary drive gear shaft 25 and the secondary driven gear 26 (see Figure 7 ) can be integrally inserted into the right housing 22 through this installation cavity opening, so as to achieve better NVH performance.

[0036] As Figure 2 shown, the primary drive gear shaft 23 of the reducer 2 corresponds to a primary left bearing 211 and a primary right bearing 212. A primary left bearing installation hole for installing the primary left bearing 211 is formed in the first annular convex portion 21g of the left housing 21. The left housing 21 also has an oil seal hole for installing the oil seal 27. The oil seal hole is arranged close to the primary left bearing installation hole and is located on the side of the primary left bearing installation hole close to the motor 1. The oil seal hole, the primary left bearing installation hole, and the motor stop portion 21c are coaxial. The outer circumference of the oil seal 27 is matched with the oil seal hole, and the inner circumference of the oil seal 27 is matched with the rotor shaft 15 of the motor 1 to seal the lubricating oil in the reducer housing and prevent the lubricating oil in the reducer housing from entering the motor 1. Since both the oil seal hole and the primary left bearing installation hole are provided in the left housing 21 and are very close in position, the coaxiality of the oil seal 27 and the primary left bearing 211 can be ensured, so that the oil seal 27 achieves a better sealing effect.

[0037] As Figure 2 shown, the secondary driving gear shaft 25 of the speed reducer 2 corresponds to a secondary left bearing 213 and a secondary right bearing 214. A secondary left bearing mounting hole for mounting the secondary left bearing 213 is formed in the second annular convex portion 21h of the left housing 21. The differential case 31 of the differential 3 corresponds to a differential left bearing 32 and a differential right bearing 33. The right housing 22 is provided with a primary right bearing mounting hole for mounting the primary right bearing 212, a secondary right bearing mounting hole for mounting the secondary right bearing 214, a differential left bearing mounting hole for mounting the differential left bearing 32, and a differential right bearing mounting hole for mounting the differential right bearing 33. In this way, the primary right bearing 212, the secondary right bearing 214, the differential left bearing 32, and the differential right bearing 33, which are subjected to greater forces, are all mounted on the right housing 22. Thus, since the right housing 22 itself has a relatively high rigidity, it can provide good support for these bearings subjected to greater forces. Moreover, it is beneficial to ensure the assembly accuracy of the primary driving gear shaft 23, the primary driven gear 24, the secondary driving gear shaft 25, the secondary driven gear 26, and the differential 3, thereby improving the overall NVH performance and reliability of the speed reducer assembly. As Figure 2 shown, bearing covers 5 are mounted at the differential left bearing mounting hole and the differential right bearing mounting hole.

[0038] As Figure 2 shown, the rotor shaft 15 of the motor 1 is connected to the primary driving gear shaft 23 of the speed reducer 2 through a spline connection, and the spline connection position is located inside the speed reducer housing. In this way, the spline connection position can be lubricated by the lubricating oil inside the speed reducer housing, and there is no need to apply lubricating grease and match an O-ring to achieve the lubrication of the spline. This lubrication method is not prone to oil shortage, which is beneficial to ensuring the NVH performance.

[0039] As Figure 3 shown, in this embodiment, the rotor shaft 15 of the motor 1 is provided with an external spline, and the primary driving gear shaft 23 of the speed reducer 2 is provided with an internal spline. One end of the rotor shaft 15 provided with the external spline extends into the primary driving gear shaft 23 to achieve the connection with the internal spline. The external spline can be processed by a gear hobbing process. The external spline processed by the gear hobbing process has a relatively high precision, which is beneficial to ensuring the NVH performance. The internal spline can be processed by a gear shaping process or a broaching process.

[0040] As Figure 3As shown, in this embodiment, a positioning circumferential surface is machined on the left side of the external spline of the rotor shaft 15 of the motor 1, and a positioning circular hole is machined on the left side of the internal spline of the first-stage driving gear shaft 23 of the speed reducer 2. The positioning circular hole and the positioning circumferential surface cooperate with each other (the area indicated by A in the figure) to limit the radial position of the rotor shaft 15 of the motor 1, thus ensuring the coaxiality of the rotor shaft 15 of the motor 1 and the first-stage driving gear shaft 23 of the speed reducer 2, achieving better NVH performance. Moreover, the right end of the rotor shaft 15 can be supported by the positioning circular hole without setting a bearing. That is to say, only one bearing ( Figure 2 the left bearing 16 of the rotor shaft in

[0041] As Figure 2 shown, the differential case 31 is connected to the second-stage driven gear 26 of the speed reducer 2 by bolts. The differential case 31 is provided with threaded holes for connecting bolts, and the second-stage driven gear 26 is provided with through holes for connecting bolts. A part of the second-stage driven gear 26 is clamped between the differential case 31 and the head of the bolt. That is to say, the head of the bolt presses against the second-stage driven gear 26. Since the hardness of the second-stage driven gear 26 is greater than that of the differential case 31, when a part of the second-stage driven gear 26 is clamped between the differential case 31 and the head of the bolt, the second-stage driven gear 26 is not easily collapsed and deformed due to clamping, thus avoiding the problem of the bolt becoming loose due to collapse deformation.

[0042] As Figure 8 shown, during assembly, this solution can first assemble the speed reducer 2, and then assemble the motor 1 after testing that the speed reducer 2 has no NVH problems. Since gear assembly is involved when assembling the speed reducer 2 and the bearing shim 29 (see Figure 2 ) needs to be repeatedly adjusted to ensure the preload of the bearing, the rework rate of the speed reducer 2 is relatively high. Assembling the speed reducer 2 first and then the motor 1 can greatly reduce the labor intensity of employees when the speed reducer 2 is reworked without disassembling and transporting the motor 1. More specifically, during assembly, the speed reducer 2 and the differential 3 are assembled together, the stator 14 is assembled in the shell cylinder 11 of the motor 1, and the shell cylinder 11 assembled with the stator 14 and the speed reducer 2 assembled with the differential 3 are assembled together to form a first assembled body; the motor controller 4 and the rotor assembly (including the rotor shaft 15, the rotor 13, and the left bearing 16 of the rotor shaft) are assembled together to form a second assembled body; then the first assembled body and the second assembled body are assembled together.

[0043] As Figure 2As shown in the figure, a process hole is provided in the right housing 22. A top hole is provided at the center of the right end face of the rotor shaft 15 of the motor 1. When assembling the first assembly and the second assembly as described above, the tooling rod passes through the process hole and abuts against the top hole to prevent the rotor 13 containing the high-strength permanent magnet from being attracted to the adjacent stator 14, causing damage to the stator-rotor 13 structure. After completing the assembly of the first assembly and the second assembly, the sealing cover 210 is installed, and the process hole is sealed by the sealing cover 210. In this embodiment, the left side of the sealing cover 210 abuts against the stepped surface at the process hole of the right housing 22, and rubber is vulcanized between them to ensure the sealing effect. The right side of the sealing cover 210 is axially limited by the third retaining ring 28c.

[0044] As Figure 9 shown, the difference between this embodiment and the above embodiment is that in this embodiment, the motor housing is provided with a left end cover 12, and the left end of the housing cylinder 11 is covered by the left end cover 12. The housing 41 of the motor controller 4 is bolted to the left end cover 12.

[0045] As Figure 10 shown, the difference between this embodiment and the above embodiment is that in this embodiment, the first-stage driving gear shaft 23 is provided with an external spline, which is connected to the internal spline of the rotor shaft 15. The spline connection is located outside the reducer housing, and the inner circumference of the oil seal 27 is matched with the first-stage driving gear shaft 23 to achieve sealing.

[0046] As Figure 10 shown, in this embodiment, the left and right sides of the inner ring of the first-stage left bearing 211 are axially limited by the second retaining ring 28b and the stepped surface on the first-stage driving gear shaft 23, and the left and right sides of the outer ring of the first-stage left bearing 211 are axially limited by the first retaining ring 28a and the stepped surface on the left housing 21, so that the axial positions of the inner and outer rings of the first-stage left bearing 211 are fixed. The left side of the inner ring of the first-stage right bearing 212 is axially limited by the stepped surface on the first-stage driving gear shaft 23, while the right side is in a free state. The right side of the outer ring of the first-stage right bearing 212 is axially limited by the stepped surface on the right housing 22, while the left side is in a free state. In this way, the first-stage left bearing 211 bears the axial force, while the first-stage right bearing 212 only bears the radial force, so that the service lives of the first-stage left bearing 211 and the first-stage right bearing 212 are balanced.

[0047] As Figure 10 shown, in this embodiment, the tooth part of the first-stage driving gear shaft 23 is relatively far from the first-stage left bearing 211 and relatively close to the first-stage right bearing 212. This is more conducive to the service life balance of the first-stage left bearing 211 and the first-stage right bearing 212, and smaller-sized bearings can be used, thereby preventing the problem that the bearing position on the first-stage driving gear shaft 23 for assembling the first-stage right bearing 212 is cut due to the too small root circle diameter of the gear teeth.

[0048] The above uses specific examples to elaborate on the principle and implementation of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A speed reducer assembly, characterized in that, The speed reducer assembly includes a motor and a speed reducer. The speed reducer housing includes a left housing relatively close to the motor and a right housing relatively far from the motor. The left housing and the right housing are connected by bolts. The left housing is a casting. The left housing has a first plate portion, a second plate portion protruding toward the motor side from the first plate portion, a motor stop portion protruding toward the motor side from the second plate portion, a motor connection hole for connecting the motor, and a right housing connection hole for connecting the right housing. The motor connection hole is provided on the second plate portion, and the right housing connection hole is provided on the first plate portion.

2. The speed reducer assembly according to claim 1, wherein The left housing has a first annular convex portion protruding from the first plate portion toward the right housing side. A first-stage left bearing is provided corresponding to the first-stage driving gear shaft of the speed reducer. A first-stage left bearing mounting hole is formed inside the first annular convex portion. The left housing further has an oil seal hole for mounting an oil seal. The inner circumference of the oil seal cooperates with the rotor shaft of the motor or the first-stage driving gear shaft of the speed reducer to achieve sealing. The oil seal hole is located on the side closer to the motor of the first-stage left bearing hole. The oil seal hole, the first-stage left bearing hole, and the motor stop portion are coaxial.

3. The speed reducer assembly according to claim 1, wherein, The motor housing includes a housing cylinder, and the left housing covers the right end of the housing cylinder.

4. The reducer assembly according to claim 3, wherein The motor housing includes a left end cover that covers the left end of the housing cylinder; or, the speed reducer assembly includes a motor controller, and the outer housing of the motor controller covers the left end of the housing cylinder.

5. The speed reducer assembly according to claim 1, wherein, The rotor shaft of the motor is connected to the first-stage driving gear shaft of the speed reducer by a spline connection, and the spline connection position is inside the speed reducer housing.

6. The speed reducer assembly according to claim 5, wherein The rotor shaft of the motor is provided with external splines and a positioning circumferential surface is provided on the left side of the external splines. The first-stage driving gear shaft of the speed reducer is provided with internal splines and a positioning round hole is provided on the left side of the internal splines. The positioning round hole and the positioning circumferential surface cooperate with each other to limit the coaxiality of the rotor shaft of the motor and the first-stage driving gear shaft of the speed reducer.

7. The speed reducer assembly according to claim 1, characterized in that, A first-stage left bearing and a first-stage right bearing are provided corresponding to the first-stage driving gear shaft of the speed reducer. The first-stage left bearing is installed in the first-stage left bearing hole, and the first-stage right bearing is installed in the first-stage right bearing hole. The inner and outer rings of the first-stage left bearing are axially limited on both sides, and the inner and outer rings of the first-stage right bearing are axially limited on one side. The tooth portion of the first-stage driving gear shaft is arranged close to the first-stage right bearing.

8. The speed reducer assembly according to claim 1, characterized in that, The right housing is provided with a process hole, and a top hole is provided at the center of the right end face of the rotor shaft of the motor. During assembly, a tooling rod can pass through the process hole and press against the top hole. The speed reducer housing further includes a sealing cover for sealing the process hole.

9. The speed reducer assembly according to any one of claims 1-8, characterized in that, A first-stage right bearing is provided corresponding to the first-stage driving gear shaft of the speed reducer, a second-stage right bearing is provided corresponding to the second-stage driving gear shaft of the speed reducer. The speed reducer assembly further includes a differential. Differential left and right bearings are provided corresponding to the differential housing. The right housing is provided with a first-stage right bearing mounting hole, a second-stage right bearing mounting hole, a differential left bearing mounting hole, and a differential right bearing mounting hole.

10. The speed reducer assembly according to claim 9, characterized in that, The differential housing is connected to the second-stage driven gear by bolts. The differential housing is provided with threaded holes for connecting the bolts, and the second-stage driven gear is provided with through holes for connecting the bolts. A part of the second-stage driven gear is clamped between the outer housing of the differential and the heads of the bolts.

Images