Differential limited slip module applied to electric drive system

Abstract

A differential slip limiting module applied to an electric driving system comprises a first shell, a clutch assembly, a reduction gear, a driving device and an output shaft, the first shell is detachably connected to a second shell of the different electric driving system, the output shaft is rotationally arranged on the first shell, and one end of the output shaft is connected with one half axle gear of a differential; the clutch assembly is coaxially installed on the output shaft, and the clutch assembly is rotationally connected to the first shell; a pressure plate assembly is arranged on the output shaft, and the pressure plate assembly abuts against the clutch assembly; the driving device is detachably connected with the first shell and the second shell, the driving device, the reduction gear and the pressure plate assembly are sequentially transmitted through a gear pair, the driving device drives the reduction gear to drive the pressure plate assembly to rotate, the pressure plate assembly applies pressure to the clutch assembly, and the torque of the output shaft is increased. Diversification of whole vehicle configuration can be achieved, flexible integration with different electric drive systems can be achieved, the adaptability is effectively improved, and the development cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of differentials, and in particular to a differential limited slip module applied to an electric drive system. Background Art

[0002] The differential is a mechanism that enables the left and right (or front and rear) driving wheels to rotate at different speeds. When the car turns or one side of the wheel slips, the speed of the wheels on both sides can be adjusted automatically. In order to reasonably distribute the driving force to the left and right wheels when the vehicle turns or drives on roads with different friction coefficients to improve the stability and handling of the vehicle, it is necessary to add a limited slip device on the basis of the differential.

[0003] In the prior art, the Chinese invention patent with patent number "ZL201810157064.0" and name "Limited Slip Differential" specifically discloses "a differential housing, a half-shaft is installed on the differential housing, and half-shaft gears are fixed on the ends of the two half-shafts respectively; a differential transmission device is arranged in the differential housing, an inner limited sliding sleeve is arranged on the half-shaft, and an outer limited sliding sleeve is arranged on the differential housing, an annular limited slip space is formed between the inner limited sliding sleeve and the outer limited sliding sleeve, a limited slip end cover is sealed at the port of the annular limited slip space, the limited slip end cover is slidably connected with the inner limited sliding sleeve or the outer limited sliding sleeve, and the annular limited slip space is filled with a high-viscosity liquid; a limited slip inner ring plate is arranged on the inner limited sliding sleeve, and a limited slip outer ring plate is arranged on the outer limited sliding sleeve". The technical solution is a limited slip differential with an overall structure, which cannot be combined with an ordinary differential and cannot be flexibly integrated with different electric drive systems. Summary of the invention

[0004] In view of the above-mentioned shortcomings of the prior art, the technical problem to be solved by the present invention is to provide a differential limited slip module applied to an electric drive system, so that it can be used in conjunction with ordinary differentials in different electric drive systems to reduce development costs.

[0005] The present invention proposes a differential limited slip module applied to an electric drive system, comprising a first housing, a clutch assembly, a reduction gear, a drive device and an output shaft, wherein the first housing is detachably connected to a second housing of a different electric drive system, the output shaft is rotatably arranged on the first housing, and one end of the output shaft is connected to one of the half-shaft gears of the differential; the clutch assembly is coaxially mounted on the output shaft, and the clutch assembly is rotatably connected to the first housing; a pressure plate assembly is provided on the output shaft, and the pressure plate assembly abuts against the clutch assembly; the drive device is detachably connected to the first housing and the second housing, the drive device, the reduction gear and the pressure plate assembly are sequentially driven by a gear pair, the drive device drives the reduction gear to drive the pressure plate assembly to rotate, and the pressure plate assembly applies pressure to the clutch assembly to increase the output shaft torque.

[0006] Preferably, the clutch assembly includes a third housing, the third housing is rotatably connected to the first housing, and the third housing is connected to the differential housing via a spline, so that the third housing drives the differential housing to rotate together.

[0007] Preferably, the clutch assembly includes a plurality of inner friction plates and outer friction plates, the inner friction plates and the outer friction plates are arranged between the third housing and the output shaft, and the inner friction plates and the outer friction plates are arranged alternately, the inner friction plates are connected to the splines of the output shaft, and the outer friction plates are connected to the third housing.

[0008] Preferably, the third housing and the output shaft are clearance-fitted.

[0009] Preferably, the first shell is arranged inside the second shell.

[0010] Preferably, the driving device is embedded in the second shell and connected to the first shell.

[0011] Preferably, the first shell is detachably fixed to the outside of the second shell.

[0012] Preferably, the driving device is arranged inside the first shell.

[0013] As described above, the differential limited slip module applied to an electric drive system according to the present invention has the following beneficial effects:

[0014] The present invention connects the second housing of different automobile electric drive systems through the first housing, connects one end of the output shaft to the half-axle gear of the differential in the electric drive system, and then drives the rotation angle of the reduction gear by controlling the driving device, thereby controlling the reduction gear to drive the pressure plate assembly to rotate and apply pressure to the clutch assembly, so that the torque at both ends of the output shaft is controlled, thereby achieving the effect of limited slip and left and right wheel torque difference.

[0015] The present invention can arrange the first shell in the second shell (i.e., the shell of the electric drive system) to form a common shell integration mode for the drive device, the first shell and the second shell. The limited slip module of the common shell integration mode is combined with the differential in the electric drive system to form a limited slip differential, which can meet the requirements of miniaturized and lightweight vehicle configuration, avoids the integration of the differential and the anti-skid device into one unit, effectively improves adaptability and reduces development costs.

[0016] The present invention can form an external limited slip module by arranging the first shell outside the second shell and arranging the drive device inside the first shell. The external limited slip module can be combined with the differentials in different electric drive systems to form a limited slip differential, which can achieve flexible integration with different electric drive systems and diversification of vehicle configurations, effectively reducing development costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the three-dimensional structure of a differential limited slip module provided in Embodiment 1 of the present invention.

[0018] Figure 2 This is a cross-sectional view AA of the differential limited slip module provided in the first embodiment of the present invention.

[0019] Figure 3 for Figure 2 A partial enlarged view of .

[0020] Figure 4 This is a front view of the differential limited slip module provided in the second embodiment of the present invention.

[0021] Figure 5 This is a left view of the differential limited slip module provided in the second embodiment of the present invention.

[0022] Figure 6 It is a right side view of the differential limited slip module provided in the second embodiment of the present invention.

[0023] Figure 7 for Figure 6 Sectional view BB.

[0024] Figure 8 for Figure 6 Section view CC.

[0025] Description of reference numerals:

[0026] 100, first housing; 200, clutch assembly; 210, third housing; 220, inner friction plate; 230, outer friction plate; 300, reduction gear; 400, drive device; 500, output shaft; 600, second housing; 700, half-shaft gear; 800, pressure plate assembly; 810, movable pressure plate; 820, ball bearing; 830, fixed pressure plate; 900, differential housing. DETAILED DESCRIPTION

[0027] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0028] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and so on quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. The change or adjustment of the relative relationship should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0029] Embodiment 1

[0030] like Figure 1-Figure 3As shown, the present invention provides an embodiment of a differential limited slip module applied to an electric drive system, comprising a first housing 100, a clutch assembly 200, a reduction gear 300, a drive device 400 and an output shaft 500. Different electric drive systems are configured in different vehicle models. The first housing 100 can be fixed inside a second housing 600 of different electric drive systems by threaded connection. The second housing 600 is provided with an opening adapted to the first housing 100, so that the first housing 100 can be adapted to the second housing 600 of different electric drive systems. The output shaft 500 is rotatably arranged on the first housing 100, and one end of the output shaft 500 is connected to one of the half-shaft gears 700 in the differential, and the other end of the output shaft 500 is connected to the axle. The clutch assembly 200 is coaxially mounted on the output shaft 500, and the clutch assembly 200 is rotatably arranged on the first housing 100 through a bearing. The end of the clutch assembly 200 is fixedly connected to the differential housing 900, and the differential housing 900 and the clutch assembly 200 are coaxial. The differential housing 900 is connected to the first housing 100 through a bearing, so that the differential housing 900 and the clutch assembly 200 rotate coaxially. A pressure plate assembly 800 is provided on the output shaft 500, and there is a clearance fit between the output shaft 500 and the pressure plate assembly 800. The fixed side of the pressure plate assembly 800 is fixedly connected to the second housing 600, and the moving side of the pressure plate assembly 800 abuts against the clutch assembly 200. Among them, the pressure plate assembly 800 is preferably a ball pressure plate assembly, and pressure can be applied to the clutch assembly 200 by rotating the ball pressure plate assembly. The driving device 400 is embedded in the second housing 600 and connected to the first housing 100, so that the second housing 600 and the first housing 100 form a co-shell integration mode. The driving device 400 includes but is not limited to being connected to the first housing 100 and the second housing 600 by threading, and can also be fixed by a detachable connection such as a snap connection or a pin connection. The driving device 400, the reduction gear 300 and the pressure plate assembly 800 are sequentially driven by a gear pair, wherein the driving device 400 includes a motor, which is preferably a brushless DC motor, and the pinion on the output shaft of the motor meshes with the reduction gear 300, thereby achieving a deceleration effect.

[0031] During use, when the wheel on one side of the vehicle slips, the output shaft 500 corresponding to the road drives the clutch group 200 and the differential housing 900 to rotate together, the speed is fast, and the torque is small and cannot get out of trouble. At this time, the motor in the drive device 400 can drive the reduction gear 300 to rotate, and the reduction gear 300 drives the moving side of the pressure plate assembly 800 to rotate around the output shaft. The pinion on the motor output shaft rotates a certain angle along the first rotation direction, driving the reduction gear 300 to rotate a corresponding angle, and the reduction gear 300 drives the pressure plate assembly 800 to rotate a corresponding angle, so that the pressure plate assembly 800 applies pressure to the clutch assembly 200, so that the friction plate in the clutch assembly 200 is compressed, thereby increasing the torque of the output shaft 500, which is convenient for the vehicle to get out of trouble. It should be noted that by controlling the rotation angle of the motor 400, the clamping degree of the friction plate in the clutch assembly 200 can be controlled. When the torque of the output shaft 500 needs to be restored to its original state, the pinion of the motor output shaft rotates in the second direction (i.e., opposite to the first direction) to move the balls in the pressure plate assembly 800 in the opposite direction, so that the friction plate in the clutch assembly 200 is loosened, and the torque of the output shaft 500 is restored to its original state. Therefore, the compression of the friction plate can be adjusted by the forward or reverse rotation angle of the motor to control the torque of the output shaft, thereby achieving the effect of limited slip and left and right wheel torque difference.

[0032] Furthermore, if Figure 3As shown, the pressure plate assembly 800 includes a mobile pressure plate 810, a plurality of balls 820 and a fixed pressure plate wheel 830. The mobile pressure plate 810 and the fixed pressure plate 830 are both provided with a raceway 820 with varying depths, and the balls 820 are arranged in the raceway through a retaining frame. The fixed plate 830 is circumferentially fixed on the second housing 600, the mobile plate 810 is rotatably sleeved on the fixed plate 830, the mobile pressure plate 810 is meshed with the reduction gear 300, and the mobile pressure plate 810 is in contact with the clutch assembly 200. The fixed pressure plate 830 is arranged on the outer side of the mobile pressure plate 810 and is fixedly connected to the second housing 600. A thrust element is provided between the mobile pressure plate 810 and the clutch assembly 200, the thrust element is in contact with the clutch assembly 200, and a return spring is provided on the thrust element, and the thrust element is preferably an axial thrust bearing. When the torque of the output shaft needs to be increased, the motor drives the reduction gear 300 to rotate a predetermined angle, and the reduction gear 300 drives the mobile pressure plate 810 to rotate. At this time, the ball 820 moves from the deep part of the raceway to the shallow part, pushing the mobile pressure plate 810 to move axially, and the distance moved is the distance corresponding to the rotation angle of the motor. The mobile pressure plate 810 pushes the thrust element to overcome the elastic force of the return spring to apply axial thrust to the clutch assembly 200, squeeze the friction plate, so that the torque of the output shaft 500 is increased, which is convenient for the vehicle to get out of trouble. When the torque of the output shaft needs to be reduced, the motor drives the reduction gear 300 to rotate in the reverse direction to drive the mobile pressure plate 810 to rotate in the reverse direction. At this time, the ball 820 rolls from the shallow part of the raceway to the deep part. Under the action of the compressed return spring, the mobile pressure plate 810 moves in the opposite direction of the axial thrust to reduce the axial thrust of the thrust element on the clutch assembly, thereby reducing the torque of the output shaft 500. Among them, the degree of reverse rotation of the motor can be determined according to how much torque is required for the output shaft. In short, the torque of the spindle can be accurately increased by controlling the forward and reverse rotation and rotation angle of the motor.

[0033] Further, the clutch assembly 200 includes a third housing 210, which is rotatably connected to the first housing 100 through a bearing, so that the third housing can rotate in the first housing 100. The third housing 210 is connected to the differential housing 900 through a spline, so that the third housing 210 drives the differential housing 900 to rotate together. The third housing 210 and the output shaft 500 are clearance-matched to avoid interference between the third housing 210 and the output shaft 500.

[0034] Furthermore, the clutch assembly 200 includes a plurality of inner friction plates 220 and outer friction plates 230, which are arranged between the third housing 210 and the output shaft 500, and the inner friction plates 220 and the outer friction plates 230 are arranged alternately, the inner friction plates 220 are connected to the splines of the output shaft 500, and the outer friction plates 230 are connected to the third housing 210, and a force plate is provided on the side close to the clutch assembly 200, which is fixed to the splines of the output shaft 500.

[0035] When in use, the motor drives the reduction gear 300 to rotate, the reduction gear 300 drives the movable pressure plate 810 to rotate, the ball 820 moves to a predetermined position, and applies pressure to the force plate through the thrust element. The force plate presses the inner friction plate 220 and the outer friction plate 230 to increase the torque of the output shaft 500.

[0036] Embodiment 2

[0037] The second embodiment is substantially the same as the first embodiment, with the following differences:

[0038] like Figure 4-Figure 8 As shown, the first housing 100 in the second embodiment includes but is not limited to a flange fixed to the outside of the second housing 600, the drive device 400 is arranged inside the first housing 100, and the connection method of the clutch assembly 200, the reduction gear 300, the drive device 400 and the output shaft 500 in the first housing 100 is the same as that in the first embodiment, and will not be repeated here. The first housing 100 in this embodiment is not co-shelled with the second housing 600, and is independently arranged. It should be noted that one end of the pressure plate assembly 800 on the output shaft 500 is circumferentially fixed to the first housing 100, and the other end of the pressure plate assembly 800 is in contact with the clutch assembly 200.

[0039] When in use, the output shaft 500 can be connected to the conventional differential axle gear in the electric drive system through the opening on the second housing 600 by spline connection, and then fixed by flange, so that the first housing 100 is externally mounted on the second housing 600 to form a limited slip differential. This embodiment can be adapted to the differential axle gears in different electric drive systems, can achieve flexible integration with different electric drive systems, and at the same time realize the diversification of vehicle configuration, effectively reducing development costs.

[0040] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A differential limited slip module applied to an electric drive system, characterized in that: The invention comprises a first housing (100), a clutch assembly (200), a reduction gear (300), a driving device (400) and an output shaft (500), wherein the first housing (100) is detachably connected to a second housing (600) of a different electric drive system, the output shaft (500) is rotatably arranged on the first housing (100), and one end of the output shaft (500) is connected to one of the half-shaft gears (700) of the differential; the clutch assembly (200) is coaxially mounted on the output shaft (500), and the clutch assembly (200) is rotatably connected to the first housing (100); the output A pressure plate assembly (800) is provided on the shaft (500), and the pressure plate assembly (800) is in contact with the clutch assembly (200); the driving device (400) is detachably connected to the first housing (100) and the second housing (600); the driving device (400), the reduction gear (300) and the pressure plate assembly (800) are sequentially driven through a gear pair; the driving device (400) drives the reduction gear (300) to drive the pressure plate assembly (800) to rotate; the pressure plate assembly (800) applies pressure to the clutch assembly (200) to increase the torque of the output shaft (500).

2. The differential limited slip module applied to an electric drive system according to claim 1, characterized in that: The clutch assembly (200) comprises a third housing (210), wherein the third housing (210) is rotationally connected to the first housing (100), and the third housing (210) is spline-connected to the differential housing (900), so that the third housing (210) drives the differential housing (900) to rotate together.

3. The differential limited slip module applied to an electric drive system according to claim 2, characterized in that: The third housing (210) and the output shaft (500) are clearance-fitted.

4. The differential limited slip module applied to an electric drive system according to claim 3, characterized in that: The clutch assembly (200) comprises a plurality of inner friction plates (220) and outer friction plates (230), wherein the inner friction plates (220) and the outer friction plates (230) are arranged between the third housing (210) and the output shaft (500), and the inner friction plates (220) and the outer friction plates (230) are arranged alternately, wherein the inner friction plates (220) are connected to the splines of the output shaft (500), and the outer friction plates (230) are connected to the third housing (210).

5. The differential limited slip module for electric drive system according to claim 1, characterized in that: The first shell (100) is arranged inside the second shell (600).

6. The differential limited slip module applied to an electric drive system according to claim 5, characterized in that: The driving device (400) is embedded in the second housing (600) and connected to the first housing (100).

7. The differential limited slip module for electric drive system according to claim 1, characterized in that: The first shell (100) is detachably fixed to the outside of the second shell (600).

8. The differential limited slip module for electric drive system according to claim 7, characterized in that: The driving device (400) is arranged inside the first shell (100).

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