A locking differential

Abstract

The present invention belongs to the technical field of differentials, and particularly refers to a locking differential, comprising a housing, wherein the left half-shaft helical teeth, the right half-shaft helical teeth, the left planetary gear, and the right planetary gear are rotatably connected in the housing, an intermediate retaining ring is arranged in the housing, and a driving seat is arranged between the intermediate retaining ring and the left half-shaft helical teeth, and the driving seat is circumferentially linked with the left half-shaft helical teeth through a circumferential driving surface, and when the left half-shaft helical teeth rotate circumferentially relative to the driving seat, the left half-shaft helical teeth can drive the driving seat to move axially through the circumferential driving surface and push the intermediate retaining ring against the right half-shaft helical teeth. In the present invention, when the automobile is idling or skidding, the left half-shaft helical teeth and the driving seat will rotate relatively, and the driving seat will push the intermediate retaining ring against the right half-shaft helical teeth along its axial direction under the guidance of the circumferential driving surface, so that the driving seat, the intermediate retaining ring and the driving seat are tightly fitted together to form a fixed connection that is approximately rigid, providing sufficient traction for the automobile.

Description

Technical field:

[0001] The invention belongs to the technical field of differentials, and in particular relates to a locking differential. Background technology:

[0002] During the driving process, the rotation speeds of the left and right tires will be different due to factors such as uneven roads, different tire outer diameters, different tire wear, different tire pressures, and different rolling radii caused by different tire loads caused by different wheel loads. Therefore, the drive axle needs to use the differential to distribute the torque to the left and right drive wheels to adapt to the different rotation speed requirements caused by the above factors and achieve the purpose of reducing tire wear during vehicle driving. However, when the car encounters bad road conditions, if one of the wheels is suspended or the friction with the ground is reduced, resulting in idling, the other wheel will lose traction, and the car will not have enough traction to get out of trouble. Summary of the invention:

[0003] The object of the present invention is to provide a locking differential which can transmit as much torque as possible to the non-slipping wheels through friction force, so as to provide sufficient traction for the vehicle.

[0004] The present invention is achieved in that:

[0005] A locking differential comprises a housing, wherein a left half-shaft helical tooth, a right half-shaft helical tooth, a left planetary gear meshing with the left half-shaft helical tooth, and a right planetary gear meshing with the right half-shaft helical tooth are rotatably connected in the housing, the left planetary gear and the right planetary gear being circumferentially staggered and meshing with each other, an intermediate retaining ring which can move axially and rotate synchronously with the housing in the circumferential direction is provided in the housing between the left half-shaft helical tooth and the right half-shaft helical tooth, an axially movable driving seat is provided between the intermediate retaining ring and the left half-shaft helical tooth, a left friction gear and a right friction gear are meshed with each other on the inner hole of the intermediate retaining ring through internal teeth, an elastic member is provided between the left friction gear and the right friction gear, the left friction gear abuts against the driving seat, the right friction gear abuts against the right half-shaft helical tooth, the driving seat is circumferentially linked with the left half-shaft helical tooth through a circumferential driving surface, and when the left half-shaft helical tooth rotates circumferentially relative to the driving seat, the left half-shaft helical tooth can drive the driving seat to move axially through the circumferential driving surface and push the intermediate retaining ring to abut against the right half-shaft helical tooth.

[0006] In the above-mentioned locking differential, arc-shaped bosses 1 are evenly distributed circumferentially on the left end surface of the driving seat, arc-shaped bosses 1 are trapezoidal in structure and the inclined surfaces on both sides are the circumferential driving surfaces, an engagement groove is formed between two adjacent arc-shaped bosses, and an arc-shaped boss 2 is provided on the end surface of the left half-shaft helical tooth, which is located in the engagement groove and cooperates with arc-shaped boss 1.

[0007] In the above-mentioned locking differential, the elastic member is a plurality of elastic washers stacked together.

[0008] In the above-mentioned locking differential, accommodating grooves are provided at the opposite ends of the inner holes of the left friction gear and the right friction gear, and an accommodating space for accommodating the elastic member is formed between the two accommodating grooves.

[0009] In the above-mentioned locking differential, a guide shaft is provided at the center of the right end surface of the driving seat, the guide shaft is penetrated through the inner holes of the left friction gear and the right friction gear, and the elastic member is sleeved on the guide shaft.

[0010] In the above-mentioned locking differential, a positioning boss is provided on the right end surface of the driving seat, and the left part of the inner hole of the left friction gear is sleeved on the positioning boss.

[0011] In the above-mentioned locking differential, a linkage opening groove corresponding to the position of the left planetary gear and the right planetary gear is circumferentially opened on the outer wall surface of the intermediate retaining ring, and a linkage fixing position for placing the left planetary gear or the right planetary gear is formed between the linkage opening groove and the housing.

[0012] The outstanding advantages of the present invention compared with the prior art are:

[0013] The left friction gear and the right friction gear of the present invention, under the elastic force of the elastic member, make the left half-shaft helical teeth and the right half-shaft helical teeth have a higher locking rate when the car is running normally. When the car is idling or slipping, the left half-shaft helical teeth and the driving seat will rotate relatively, and the driving seat will push the middle retaining ring along its axial direction under the guidance of the circumferential driving surface to press against the right half-shaft helical teeth, so that the middle retaining ring and the right half-shaft helical teeth and the driving seat respectively generate and increase friction and make the driving seat, the middle retaining ring and the driving seat fit tightly together to form a fixed connection that is almost rigid, thereby forming a higher locking rate between the left half-shaft helical teeth and the right half-shaft helical teeth, and providing sufficient traction for the car. Description of the drawings:

[0014] Figure 1 It is an overall exploded view of the present invention;

[0015] Figure 2 It is a stereoscopic view of the left half-shaft helical gear and the driving seat of the present invention.

[0016] In the figure: 1. left half-shaft spiral teeth; 2. right half-shaft spiral teeth; 3. left planetary gear; 4. right planetary gear; 5. intermediate retaining ring; 6. driving seat; 7. left friction gear; 8. right friction gear; 9. circumferential driving surface; 10. arc boss 1; 11. meshing groove; 12. arc boss 2; 13. elastic washer; 14. accommodating groove; 15. guide shaft; 16. positioning boss; 17. linkage opening groove. Specific implementation method:

[0017] The present invention is further described below with reference to specific embodiments. Figure 1 —2:

[0018] A locking differential, a locking differential, comprising a housing, a left half-shaft helical tooth 1, a right half-shaft helical tooth 2, a left planetary gear 3 meshing with the left half-shaft helical tooth 1, and a right planetary gear 4 meshing with the right half-shaft helical tooth 2 are rotatably connected in the housing, the left planetary gear 3 and the right planetary gear 4 are circumferentially staggered and meshed, an intermediate retaining ring 5 that can move axially and rotate synchronously with the housing in the circumferential direction is provided in the housing between the left half-shaft helical tooth 1 and the right half-shaft helical tooth 2, and a driving gear that can move axially is provided between the intermediate retaining ring 5 and the left half-shaft helical tooth 1 The left friction gear 7 and the right friction gear 8 are connected to the inner hole of the seat 6 and the middle retaining ring 5 through internal tooth meshing, and an elastic member is provided between the left friction gear 7 and the right friction gear 8. The left friction gear 7 abuts on the driving seat 6, and the right friction gear 8 abuts on the right half-shaft helical gear 2. The driving seat 6 is circumferentially linked with the left half-shaft helical gear 1 through the circumferential driving surface 9, and when the left half-shaft helical gear 1 rotates circumferentially relative to the driving seat 6, the left half-shaft helical gear 1 can drive the driving seat 6 to move axially through the circumferential driving surface 9 and push the middle retaining ring 5 to abut against the right half-shaft helical gear 2.

[0019] The working principle of the present invention is as follows: during normal driving of the automobile, the housing drives the left friction gear 7 and the right friction gear 8 to rotate synchronously through the intermediate retaining ring 5. Under the elastic force of the elastic member, a certain friction force is generated between the left friction gear 7 and the drive seat 6, and between the right friction gear 8 and the helical teeth of the half shaft, and the drive seat 6 rotates synchronously with the left half shaft helical teeth 1 through the circumferential driving surface 9, so that a higher locking rate is obtained between the left half shaft helical teeth 1 and the right half shaft helical teeth 2; when one of the tires of the automobile slips, the left half shaft helical teeth 1 and the right half shaft helical teeth 2 corresponding to the left and right half shafts will produce different rotation speeds, the left half shaft helical teeth 1 will rotate relative to the drive seat 6, and under the structural action of the circumferential driving surface 9, the drive seat 6 overcomes the elastic force of the elastic member and axially pushes the intermediate retaining ring 5 tightly against the right half shaft helical teeth 2, so that the left half shaft helical teeth 1, the drive seat 6, the intermediate retaining ring 5 and the right half shaft helical teeth 2 form a fixed connection that is approximately rigid.

[0020] That is, under the elastic force of the elastic member, the left friction gear 7 and the right friction gear 8 of the present invention enable the left half-shaft helical teeth 1 and the right half-shaft helical teeth 2 to have a higher locking rate when the car is running normally. When the car is idling or slipping, the left half-shaft helical teeth 1 and the drive seat 6 will rotate relatively, and the drive seat 6 will push the middle retaining ring 5 against the right half-shaft helical teeth 2 along its axial direction under the guidance of the circumferential driving surface 9, so that the friction force between the middle retaining ring 5 and the right half-shaft helical teeth 2 and the drive seat 6 is generated and increased, so that the drive seat 6, the middle retaining ring 5 and the drive seat 6 are tightly fitted together to form a fixed connection that is almost rigid, thereby forming a higher locking rate between the left half-shaft helical teeth 1 and the right half-shaft helical teeth 2, providing sufficient traction for the car.

[0021] Among them, the circumferential driving surface 9 can adopt a curved surface structure to realize the circumferential linkage and axial movement between the left half-shaft helical tooth 1 and the driving seat 6. In the present embodiment, in order to make the connection between the left half-shaft helical tooth 1 and the driving seat 6 stable and the transmission reliable, the specific structure adopted is: arc-shaped bosses 10 are evenly distributed circumferentially on the left end surface of the driving seat 6, and the arc-shaped bosses 10 are trapezoidal in structure and the inclined surfaces on both sides are the circumferential driving surface 9, and an engaging groove 11 is formed between two adjacent arc-shaped bosses. An arc-shaped boss 2 12 is provided on the end face of the left half-shaft helical tooth 1, which is located in the engaging groove 11 and matches the arc-shaped boss 10. That is, the number and position of the arc-shaped boss 2 12 correspond to the meshing groove 11, and the arc-shaped boss 2 12 abuts against the circumferential driving surface 9 on one side of the arc-shaped boss 10 to realize the circumferential linkage between the left half-shaft helical tooth 1 and the driving seat 6. When the left half-shaft helical tooth 1 rotates circumferentially relative to the driving seat 6, the arc-shaped boss 2 12 will move relatively along the inclined circumferential driving surface 9, thereby realizing the axial displacement of the driving seat 6.

[0022] Furthermore, in this embodiment, the structure adopted by the elastic member is: the elastic member is a plurality of elastic washers 13 stacked together.

[0023] Furthermore, in order to facilitate the placement of the elastic gasket 13 between the left friction gear 7 and the right friction gear 8, accommodating grooves 14 are provided at the opposite ends of the inner holes of the left friction gear 7 and the right friction gear 8, and an accommodating space for accommodating the elastic member is formed between the two accommodating grooves 14.

[0024] At the same time, in order to enable the drive seat 6 to perform stable axial sliding in the shell, a guide shaft 15 is provided at the center of the right end face of the drive seat 6. The guide shaft 15 is passed through the inner holes of the left friction gear 7 and the right friction gear 8, and the elastic part is mounted on the guide shaft 15.

[0025] Furthermore, in order to improve the matching stability between the driving seat 6 and the left friction gear 7 , a positioning boss 16 is provided on the right end surface of the driving seat 6 , and the left part of the inner hole of the left friction gear 7 is sleeved on the positioning boss 16 .

[0026] In addition, in order to realize the synchronous circumferential rotation and axial sliding of the intermediate retaining ring 5 and the shell, a linkage opening groove 17 corresponding to the position of the left planetary gear 3 and the right planetary gear 4 is circumferentially opened on the outer wall surface of the intermediate retaining ring 5, and a linkage fixing position for placing the left planetary gear 3 or the right planetary gear 4 is formed between the linkage opening groove 17 and the shell, that is, the shell drives the synchronous circumferential rotation of the intermediate retaining ring 5 through the left planetary gear 3 and the right planetary gear 4.

[0027] The above embodiment is only one of the preferred embodiments of the present invention, and is not intended to limit the scope of implementation of the present invention. Therefore, any equivalent changes made based on the shape, structure, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A locking differential, comprising a housing, wherein a left half-shaft helical gear (1), a right half-shaft helical gear (2), a left planetary gear (3) meshing with the left half-shaft helical gear (1), and a right planetary gear (4) meshing with the right half-shaft helical gear (2) are rotatably connected in the housing, wherein the left planetary gear (3) and the right planetary gear (4) are circumferentially staggered and meshed with each other, and characterized in that: An intermediate retaining ring (5) capable of axial movement and circumferentially rotating synchronously with the housing is provided in the housing between the left half-shaft helical teeth (1) and the right half-shaft helical teeth (2); an axially movable driving seat (6) is provided between the intermediate retaining ring (5) and the left half-shaft helical teeth (1); a left friction gear (7) and a right friction gear (8) are connected to the inner hole of the intermediate retaining ring (5) through internal tooth meshing; an elastic member is provided between the left friction gear (7) and the right friction gear (8); the left friction gear (7) abuts against the driving seat (6); the right friction gear (8) abuts against the right half-shaft helical teeth (2); the driving seat (6) is circumferentially linked with the left half-shaft helical teeth (1) through a circumferential driving surface (9); and when the left half-shaft helical teeth (1) rotate circumferentially relative to the driving seat (6), the left half-shaft helical teeth (1) can drive the driving seat (6) to move axially through the circumferential driving surface (9) and push the intermediate retaining ring (5) to abut against the right half-shaft helical teeth (2); The left end surface of the driving seat (6) is evenly distributed with arc-shaped bosses (10) in the circumferential direction. The arc-shaped bosses (10) are trapezoidal in structure and the inclined surfaces on both sides are the circumferential driving surfaces (9). An engagement groove (11) is formed between two adjacent arc-shaped bosses. The end surface of the left half-shaft helical tooth (1) is provided with an arc-shaped boss (12) located in the engagement groove (11) and matched with the arc-shaped boss (10).

2. A locking differential according to claim 1, characterized in that: The elastic member is a plurality of elastic washers (13) stacked together.

3. A locking differential according to claim 1 or 2, characterized in that: Relative ends of the inner holes of the left friction gear (7) and the right friction gear (8) are both provided with accommodating grooves (14), and an accommodating space for accommodating an elastic member is formed between the two accommodating grooves (14).

4. A locking differential according to claim 1 or 2, characterized in that: A guide shaft (15) is arranged at the center of the right end surface of the driving seat (6), the guide shaft (15) is inserted into the inner holes of the left friction gear (7) and the right friction gear (8), and the elastic member is sleeved on the guide shaft (15).

5. A locking differential according to claim 1, characterized in that: A positioning boss (16) is provided on the right end surface of the driving seat (6), and the left part of the inner hole of the left friction gear (7) is sleeved on the positioning boss (16).

6. A locking differential according to claim 1, characterized in that: A linkage opening groove (17) corresponding to the position of the left planetary gear (3) and the right planetary gear (4) is circumferentially opened on the outer wall surface of the intermediate retaining ring (5), and a linkage fixing position for placing the left planetary gear (3) or the right planetary gear (4) is formed between the linkage opening groove (17) and the housing.

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