Transmission device for a motor vehicle

Abstract

The present invention provides a transmission device for a motor vehicle, which is used to transmit and connect the driving motor of the motor vehicle and a pair of left and right driving wheels of the motor vehicle; the transmission device includes a differential mechanism, a planetary gear reduction mechanism and a brake mechanism, and the brake mechanism is used to limit the rotation of the differential mechanism; the brake mechanism includes a brake housing, a static friction plate arranged on the brake housing, a dynamic friction plate arranged on the differential mechanism, a piston that can be pushed by an external force and drive the dynamic friction plate to move relative to the static friction plate, and an elastic member abutting between the brake housing and the piston. The dynamic friction plate can rotate with the differential mechanism, and can cooperate with the static friction plate when contacting the static friction plate to limit the rotation of the differential mechanism. The present invention has a compact structure and saves space.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle accessories, and in particular to a rotating device for a motor vehicle. Background Art

[0002] The axle of a car is connected to the frame through a suspension, and wheels are installed at both ends. The function of the axle is to bear the load of the car and maintain the normal driving of the car on the road.

[0003] The axle needs to use a reducer, a differential and a brake to achieve the power output of the drive motor to achieve the purpose of driving and braking the car. The existing brake and differential are both separated, occupying a large volume and reducing the vehicle's passing rate. Summary of the invention

[0004] The present invention provides a transmission device for a motor vehicle, aiming to improve the technical problem in the prior art that the brake and the differential are separately arranged, occupy a large volume, and reduce the passing rate of the vehicle.

[0005] The present invention is achieved in that:

[0006] A transmission device for a motor vehicle, used for transmission connection between a driving motor of the motor vehicle and a pair of left and right driving wheels of the motor vehicle; the transmission device comprises:

[0007] A differential mechanism, which can be connected to the pair of left and right driving wheels through a pair of left and right transmission shafts;

[0008] A planetary gear reduction mechanism is used to connect the drive motor and the differential mechanism to transmit the power of the drive motor to the differential mechanism;

[0009] A brake mechanism, used to limit the rotation of the differential mechanism;

[0010] The braking mechanism comprises:

[0011] Brake housing;

[0012] The static friction plate is arranged on the brake housing;

[0013] A dynamic friction plate is arranged on the differential mechanism, the dynamic friction plate can rotate with the differential mechanism, and can cooperate with the static friction plate when contacting the static friction plate to limit the rotation of the differential mechanism;

[0014] The piston can be pushed by external force and drive the dynamic friction plate to move relative to the static friction plate;

[0015] The elastic member is abutted between the brake housing and the piston. The elastic member can be elastically deformed by the piston when the piston is pushed by an external force, and the elastic member can be reset after the piston is not pushed by the external force to push the dynamic friction plate to contact the static friction plate.

[0016] Furthermore, in a preferred embodiment of the present invention, the differential mechanism includes a differential housing and a differential assembly disposed in the differential housing for connecting to the left and right pair of drive shafts, and the planetary gear reduction mechanism is connected to the differential housing and can drive the differential assembly to rotate through the differential housing.

[0017] Furthermore, in a preferred embodiment of the present invention, the planetary gear reduction mechanism includes a sun gear that can be driven by the drive motor to rotate, a planetary gear bracket connected to the differential housing, a reducer housing with an inner ring gear formed on the inner wall, and a first planetary gear rotatably arranged on the planetary gear bracket and respectively meshing with the sun gear and the inner ring gear of the reducer housing; when the sun gear rotates, the planetary gear bracket is driven to rotate through the first planetary gear, and when the planetary gear bracket rotates, it can drive the differential assembly to rotate through the differential housing.

[0018] Furthermore, in a preferred embodiment of the present invention, a fluid inlet channel is provided on the brake housing for the hydraulic source to flow to the piston position. When the hydraulic source flows along the fluid inlet channel to the piston position, the piston is pushed to move, so that the piston moves relative to the static friction plate.

[0019] Furthermore, in a preferred embodiment of the present invention, the differential housing is provided with external teeth matched with the dynamic friction plate, and the dynamic friction plate can move along the external teeth relative to the static friction plate.

[0020] Furthermore, in a preferred embodiment of the present invention, the differential assembly includes a cross shaft, a plurality of second planetary gears and two relatively arranged half-shaft spline sleeves, the plurality of second planetary gear sleeves are arranged on the shaft portion of the cross shaft, each of the second planetary gears is respectively engaged with two half-shaft spline sleeves, the two half-shaft spline sleeves are respectively sleeved on the left and right pair of transmission shafts, and the differential housing can drive the cross shaft to rotate so that the second planetary gears drive the half-shaft spline sleeves to rotate.

[0021] Furthermore, in a preferred embodiment of the present invention, the sun gear is coaxially arranged with the two half-shaft spline sleeves.

[0022] The beneficial effect of the present invention is that when the device obtained by the above design is used, the elastic member can push the dynamic friction plate close to the static friction plate through the arrangement of the differential mechanism and the brake mechanism, and the dynamic friction plate and the static friction plate contact and form friction, so as to achieve the purpose of braking the differential mechanism. The differential mechanism and the brake mechanism are integrated, the occupied volume of the differential mechanism and the brake mechanism is reduced, and the passing rate of the vehicle is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 The present invention is a schematic structural diagram of a transmission device for a motor vehicle. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the invention claimed for protection, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0026] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0027] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0028] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0030] Please refer to Figure 1 In an embodiment, a transmission device for a motor vehicle is used to transmit and connect a driving motor S1 of a motor vehicle and a pair of left and right driving wheels of the motor vehicle. The transmission device comprises a differential mechanism 2, a planetary gear reduction mechanism 1 and a brake mechanism 3. The planetary gear reduction mechanism 1 is used to connect the driving motor S1 and the differential mechanism 2 to transmit the power of the driving motor S1 to the differential mechanism 2. The planetary gear reduction mechanism 1 can reduce the speed of the driving motor S1 and increase the torque. The differential mechanism 2 can be connected to the pair of left and right driving wheels through a pair of left and right transmission shafts L1 and L2. The brake mechanism 3 is used to limit the rotation of the differential mechanism 2. The brake mechanism 3 is combined with the differential mechanism 2, which saves more space than the brake and differential arranged separately.

[0031] Furthermore, the brake mechanism 3 comprises a brake housing 11, a static friction plate 15, a dynamic friction plate 14, a piston 12 and an elastic member 13. The static friction plate 15 is arranged on the brake housing 11, and the dynamic friction plate 14 is arranged on the differential mechanism 2. The dynamic friction plate 14 can rotate with the differential mechanism 2, and can cooperate with the static friction plate 15 when contacting the static friction plate 15 to limit the rotation of the differential mechanism 2. The piston 12 can be pushed by an external force and drive the dynamic friction plate 14 to move relative to the static friction plate 15. The elastic member 13 abuts between the brake housing 11 and the piston 12. The elastic member 13 can be elastically deformed by the action of the piston 12 when the piston 12 is pushed by an external force, and the elastic member 13 can be reset after the piston 12 is not pushed by an external force to push the dynamic friction plate 14 to contact the static friction plate 15. The differential housing 8 is provided with external teeth that cooperate with the dynamic friction plate 14, and the dynamic friction plate 14 can move relative to the static friction plate 15 along the external teeth.

[0032] Through the setting of the external teeth, the dynamic friction plate 14 can rotate synchronously with the differential case, and the external teeth can play a guiding role, so that the dynamic friction plate 14 can move along the external teeth relative to the static friction plate 15, preventing the dynamic friction plate 14 and the differential case 8 from sliding, thereby ensuring the braking of the differential case 8.

[0033] When braking, the elastic member 13 pushes the dynamic friction plate 14 so that the dynamic friction plate 14 is close to the static friction plate 15 and contacts with the static friction plate 15. The elastic member 13 and the piston 12 continuously apply thrust to the dynamic friction plate 14 so that the dynamic friction plate 14 rubs against the static friction plate 15. Since the dynamic friction plate 14 rotates synchronously with the differential mechanism 2, the dynamic friction plate 14 drives the differential mechanism to stop transmission, thereby forming braking of the differential mechanism 2.

[0034] In the embodiment, the brake housing 11 is provided with a fluid inlet channel 16 for the hydraulic source to flow to the piston 12 position. When the hydraulic source flows along the fluid inlet channel 16 to the piston 2 position, the piston 12 is pushed to move, so that the piston 12 moves relative to the static friction plate 15.

[0035] When the brake is released, the liquid inlet channel 16 is opened, and the hydraulic source flows to the position of the piston 12 through the liquid inlet channel 16, pushing the piston 12 to move in a direction away from the static friction plate 15, thereby eliminating the pressure of the piston 12 on the dynamic friction plate 14, and the dynamic friction plate 14 and the static friction plate 15 are free from friction, and the brake of the differential mechanism 2 is released. The liquid inlet channel 16, the differential housing 8 and the brake housing are provided with sealing rings to prevent the leakage of the hydraulic source.

[0036] The drive motor S1 is decelerated by the planetary gear reduction mechanism 1. When braking is required, the brake mechanism 3 brakes the differential mechanism 2. Compared with directly braking the drive motor S1, the heat and noise generated by the brake mechanism 3 and the differential mechanism 2 are greatly reduced.

[0037] In the embodiment, the differential mechanism 2 includes a differential housing 8 and a differential assembly disposed in the differential housing 8 and connected to the pair of left and right transmission shafts L1 and L2. The planetary gear reduction mechanism 1 is connected to the differential housing 8 and can drive the differential assembly to rotate through the differential housing 8. The brake housing 11 is arranged around the differential housing 8, and the differential housing 8 and the brake housing 11 are connected through a bearing to ensure the rotation of the differential housing 8 relative to the brake housing 11.

[0038] Furthermore, the differential assembly includes a cross shaft, a plurality of second planetary gears 10 and two oppositely arranged half-shaft spline sleeves 9, wherein the plurality of second planetary gears 10 are sleeved on the ends of the cross shaft. Each of the second planetary gears 10 is respectively engaged with two half-shaft spline sleeves 9, and the two half-shaft spline sleeves 9 are respectively sleeved on the left and right pair of transmission shafts L1 and L2, and the differential housing 8 can drive the cross shaft to rotate, so that the second planetary gears 10 drive the half-shaft spline sleeves 9 to rotate.

[0039] The differential housing 8 drives the cross shaft to rotate, and then the second planetary gear 10 mounted on the end of the cross shaft drives the two meshing half-shaft spline sleeves 9 to rotate. Since the half-shaft spline sleeves 9 are mounted on the left and right pair of transmission shafts L1, L2, they drive the left and right pair of transmission shafts L1, L2 to rotate.

[0040] In the embodiment, the planetary gear reduction mechanism 1 includes a sun gear 4 that can be driven by the drive motor S1 to rotate, a planetary gear carrier 5 connected to the differential case 8, a reducer case 7 with an inner ring gear formed on the inner wall, and a first planetary gear 6 rotatably arranged on the planetary gear carrier 5 and respectively meshing with the sun gear 4 and the inner ring gear of the reducer case 7. When the sun gear 4 rotates, the planetary gear carrier 5 is driven to rotate through the first planetary gear 6, and when the planetary gear carrier 5 rotates, the differential assembly can be driven to rotate through the differential case 8.

[0041] By disposing the planetary gear reduction mechanism 1 , the rotation speed of the drive motor S1 can be reduced and the torque of the drive motor S1 can be increased at the same time.

[0042] In the embodiment, the sun gear 4 is coaxially arranged with two half-shaft spline sleeves 9. The output shaft of the drive motor S1 is a hollow shaft, and one of the left and right transmission shafts L1 and L2 passes through the output shaft of the drive motor S1, so that the planetary gear reduction mechanism 1 and the differential mechanism 2 are arranged in a straight line, which reduces the occupied volume and improves the vehicle's pass rate.

[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A transmission device for a motor vehicle, used for transmission connection between a driving motor (S1) of the motor vehicle and a pair of left and right driving wheels of the motor vehicle; characterized in that: The transmission device comprises: a differential mechanism (2) which can be connected to the pair of left and right drive wheels through a pair of left and right transmission shafts (L1, L2); a planetary gear reduction mechanism (1) which is used to connect the drive motor (S1) and the differential mechanism (2) so as to transmit the power of the drive motor (S1) to the differential mechanism (2); a brake mechanism (3) which is used to limit the rotation of the differential mechanism (2); the brake mechanism (3) comprises: a brake housing (11); a static friction plate (15) which is arranged on the brake housing (11); a dynamic friction plate (14 ), arranged on the differential mechanism (2), the dynamic friction plate (14) can rotate with the differential mechanism (2), and can cooperate with the static friction plate (15) when contacting the static friction plate (15) to limit the rotation of the differential mechanism (2); the piston (12), can be pushed by an external force and drive the dynamic friction plate (14) to move relative to the static friction plate (15); the elastic member (13), abutting between the brake housing (11) and the piston (12), the elastic member (13) can be elastically moved by the piston (12) when the piston (12) is pushed by an external force The piston (12) is deformed, and the elastic member (13) can be reset after the piston (12) is not pushed by external force to push the dynamic friction plate (14) to contact the static friction plate (15); the differential mechanism (2) includes a differential housing (8) and a differential assembly arranged in the differential housing (8) and connected to the left and right pair of transmission shafts (L1, L2); the planetary gear reduction mechanism (1) is connected to the differential housing (8) and can drive the differential assembly to rotate through the differential housing (8); the planetary gear reduction mechanism (1) includes a differential housing (8) that can be driven by the driving motor A sun gear (4) driven to rotate by a motor (S1), a planetary gear support (5) connected to a differential housing (8), a reducer housing (7) with an inner ring gear formed on its inner wall, and a first planetary gear (6) rotatably arranged on the planetary gear support (5) and meshing with the sun gear (4) and the inner ring gear of the reducer housing (7) respectively; when the sun gear (4) rotates, the planetary gear support (5) is driven to rotate through the first planetary gear (6), and when the planetary gear support (5) rotates, the differential assembly can be driven to rotate through the differential housing (8); The differential housing (8) is provided with external teeth that match the dynamic friction plate (14), and the dynamic friction plate (14) can move along the external teeth relative to the static friction plate (15); The differential assembly comprises a cross shaft, a plurality of second planetary gears (10) and two oppositely arranged half-shaft spline sleeves (9); the plurality of second planetary gears (10) are sleeved on the shaft portion of the cross shaft; each of the second planetary gears (10) is respectively meshed with two half-shaft spline sleeves (9); the two half-shaft spline sleeves (9) are respectively sleeved on the left and right pair of transmission shafts (L1, L2); the differential housing (8) can drive the cross shaft to rotate, so that the second planetary gears (10) drive the half-shaft spline sleeves (9) to rotate.

2. The transmission device according to claim 1, characterized in that: The brake housing (11) is provided with a fluid inlet channel (16) for the hydraulic source to flow to the position of the piston (12). When the hydraulic source flows along the fluid inlet channel (16) to the position of the piston (12), the piston (12) is pushed to move, so that the piston (12) moves relative to the static friction plate (15).

3. The transmission device according to claim 2, characterized in that: The sun gear (4) is coaxially arranged with two half-shaft spline sleeves (9).

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