Limited slip differential
By designing a limited slip mechanism with mechanical structure in the differential and releasing or locking the half-axle gear, the problem of uneven torque distribution in the existing differential under harsh road conditions is solved, torque equalization and slip prevention are achieved, and the stability and passing ability of the vehicle are improved.
Patent Information
- Application Number
- CN202420791465.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-16
- Publication Date
- 2025-03-11
- Estimated Expiration
- 2034-04-16
AI Technical Summary
The existing differentials cannot automatically adjust the torque distribution under harsh road conditions, resulting in large differences in wheel speeds, affecting the stability and passing ability of the vehicle. Common anti-slip measures rely on friction plates, which have high wear resistance requirements and inconvenient maintenance.
A limited-slip differential is designed, and a limited-slip mechanism with a mechanical structure is used to release or lock the half-shaft gear through the cooperation of the limited-slip parts and grooves, so that it rotates differently or the same as the transmission bracket, thereby evenly dividing the torque under harsh road conditions and avoiding slippage.
It realizes equalized torque under harsh road conditions, reduces the probability of wheel slip, improves driving stability and passability, and does not require friction plates, which has a reliable structure and convenient maintenance.
Smart Images
Figure CN222596687U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of automobile parts, in particular to a limited slip differential. Background Art
[0002] The differential is a key automotive component, and its main function is to enable the front and rear drive wheels of the car to rotate at different speeds. The existing differential is mainly composed of left and right half-axle gears, two planetary gears and a gear rack. The torque equalization characteristic of the ordinary differential makes it impossible for the differential to automatically adjust the torque distribution according to the road conditions. Under bad road conditions, it will cause a large difference in the speed of the wheels, affecting the stability and passing ability of the vehicle, making it easy for the vehicle to slip when driving on wet, muddy or uneven roads, reducing the stability of the vehicle. The existing anti-slip differential usually increases the friction resistance by adding a metal friction plate between the housing and the half-axle gear to control, so as to minimize the speed difference between the wheels on both sides. However, this method relies on friction to generate resistance, and has high requirements on the wear resistance of the half-axle gear and the metal friction plate. After the metal friction plate is worn, it is very inconvenient to replace it.
[0003] Therefore, there is an urgent need to develop a limited slip differential that can limit the rotation of the left and right half-shaft gears relative to the differential housing under harsh road conditions. At the same time, there is no need to use friction plates, there is no friction plate slippage, it can withstand large torque, and it is convenient for subsequent maintenance and use. Summary of the invention
[0004] In view of this, the purpose of the utility model is to provide a limited slip differential that can adapt to the use requirements of various road conditions. Even under harsh road conditions, the wheels on one side will not slip. At the same time, the overall structure adopts a mechanical structure, which is reliable and convenient for subsequent maintenance and use.
[0005] A limited slip differential of the utility model comprises:
[0006] A differential body, wherein a transmission bracket is disposed in the differential body, the transmission bracket can rotate around a first axis, and a left half-shaft gear, a right half-shaft gear and a planetary gear meshing with the left half-shaft gear and the right half-shaft gear are disposed in the transmission bracket;
[0007] The limited slip mechanism is respectively arranged on the left half-shaft gear and the right half-shaft gear, and is used for releasing or locking the left half-shaft gear and the right half-shaft gear, so that the rotation speed of the left half-shaft gear and the right half-shaft gear and the transmission bracket are different or the same; the limited slip mechanism is arranged, so that under bad road conditions, the rotation of the left half-shaft gear and the right half-shaft gear relative to the differential housing can be limited to avoid the phenomenon of one side wheel slipping, so that the vehicle can drive normally.
[0008] Furthermore, the limited slip mechanism includes a limited slip part, and grooves cooperating with the limited slip part are respectively arranged on the left half-shaft gear and the right half-shaft gear. The limited slip part is clearance-matched with the transmission bracket and can be driven away from or inserted into the groove, so as to release or lock the left half-shaft gear and the right half-shaft gear; grooves cooperating with the limited slip part are arranged on the left half-shaft gear and the right half-shaft gear, and the left half-shaft gear and the right half-shaft gear are released or locked by cooperating with the limited slip part and the groove, and the mechanical structure cooperation method is adopted to make the structure reliable and simple.
[0009] Furthermore, it also includes a thrust block, which can be driven away from or close to the slip limiter; the movement of the slip limiter is pushed by the movement of the thrust block, and when the thrust block approaches the slip limiter, the slip limiter can be inserted into the groove to lock the left half-shaft gear and the right half-shaft gear.
[0010] Furthermore, an installation groove is provided on the slip limiter, and an end face bearing cooperating with the thrust block is provided in the installation groove, so that the slip limiter can be driven to be inserted into or away from the groove; by arranging the end face bearing to cooperate with the thrust block, the friction can be reduced while improving the stability of the overall structure.
[0011] Furthermore, the limited slip mechanism is provided with an oil channel, and the thrust block is located on the oil channel and is arranged corresponding to the outlet of the oil channel; the oil channel is provided to control the movement of the thrust block by changing the oil pressure in the oil channel, so that the overall structure is reliable.
[0012] Furthermore, a sealing ring is provided between the oil channel and the thrust block; a sealing ring is provided between the oil channel and the thrust block to avoid oil leakage in the oil channel and to maintain pressure.
[0013] Furthermore, it also includes two return springs for applying elastic force to the slip limiter so that the slip limiter moves away from the groove to release the left half-shaft gear and the right half-shaft gear; the return spring is set, and when the oil channel stops flowing oil, the pressure is reduced, and under the action of the return spring, the slip limiter returns to its initial position.
[0014] Furthermore, it also includes a thrust block arranged on the transmission bracket, and the thrust block is used to limit the displacement of the sliding limiter to the left; the thrust block is arranged to prevent the sliding limiter from moving too much in the direction of the half-axle gear.
[0015] Furthermore, it also includes a limit collar arranged on the sliding member, and the limit collar is used to limit the displacement of the sliding member to the right; the limit collar is provided to prevent the sliding member from directly sliding out of the transmission bracket when returning to the initial position.
[0016] Furthermore, there are multiple grooves, and the width of the grooves is greater than the width of the slip limiter. By providing multiple grooves, and the width of the grooves is greater than the width of the slip limiter, the slip limiter can be more easily inserted into the grooves, thereby improving the use effect.
[0017] Beneficial effects of the utility model: A limited slip differential of the utility model can adapt to the use requirements of various road conditions by setting a limited slip mechanism. When it is necessary to limit the torque difference between the left half-shaft gear and the right half-shaft gear, the torque can be evenly distributed to the left half-shaft gear and the right half-shaft gear, thereby reducing the probability of slipping of the wheels on one side and improving the driving effect. At the same time, the overall limited slip mechanism adopts a mechanical structure, so that the overall structure is reliable. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] The utility model is further described below in conjunction with the accompanying drawings and embodiments:
[0019] Figure 1 It is a schematic diagram of the structure of the utility model;
[0020] Figure 2 is a schematic diagram of the structure of the groove;
[0021] Figure 3 It is the structural schematic diagram of the thrust block;
[0022] The above drawings contain the following reference numerals:
[0023] 1. Transmission bracket; 101. Left half-shaft gear; 102. Right half-shaft gear; 103. Planetary gear; 104. Planetary gear shaft; 105. Groove; 106. Limit block;
[0024] 2. Slip limiting mechanism; 201. Slip limiting member; 202. Thrust block; 203. Housing; 204. End bearing; 205. Oil channel; 206. Sealing ring; 207. Return spring; 208. Limiting clamp ring. DETAILED DESCRIPTION
[0025] Figure 1 It is a structural schematic diagram of the utility model. Figure 2 is a schematic diagram of the groove structure. Figure 3 is the structural diagram of the thrust block, as shown in Figure 1-3 As shown: A limited slip differential of this embodiment includes:
[0026] A differential body, wherein a transmission support 1 is arranged in the differential body, wherein the transmission support 1 can rotate around a first axis, wherein a left side gear 101, a right side gear 102 and a planetary gear 103 meshing with the left side gear 101 and the right side gear 102 are arranged in the transmission support 1, wherein the planetary gear 103 can rotate around a second axis arranged perpendicular to the first axis, and wherein the left side gear 101 and the right side gear 102 can rotate around the first axis; Figure 1 As shown, a limited slip differential is shown in cross section, the differential body includes a transmission bracket 1, the transmission bracket 1 has a housing, the transmission bracket 1 can rotate around a first axis (the same axis as the two wheels), a planetary gear shaft 104 extends perpendicular to the first axis through a cavity in the transmission bracket 1, the planetary gear shaft 104 has two planetary gears 103 rotatably connected thereto, a left half-shaft gear 101 and a right half-shaft gear 102 (left and right are only used to distinguish between the two half-shaft gears, the left half-shaft gear can also be the right half-shaft gear) can rotate around the first axis and mesh with the planetary gears 103, When in use, the transmission support 1 is installed in a cavity (the cavity of the differential body) in the vehicle and covered with a housing (not shown, i.e., the differential housing) to seal the cavity. The peripheral area of the transmission support 1 housing is connected to a ring gear (not shown), which meshes with a pinion gear (not shown) connected to a drive shaft (not shown) driven by the vehicle engine. When the ring gear is driven, the transmission support 1 rotates around the first axis, causing the planetary gear shaft 104 and the planetary gear 103 to rotate, which in turn causes the left side gear 101 and the right side gear 102 and the associated output shaft to rotate.
[0027] The limited slip mechanism 2 is respectively arranged on the left half-shaft gear 101 and the right half-shaft gear 102, and is used to release or lock the left half-shaft gear 101 and the right half-shaft gear 102, so that the left half-shaft gear 101 and the right half-shaft gear 102 have different or the same rotation speed as the transmission bracket 1; the number of the limited slip mechanism 2 can be set according to actual use needs, preferably four, which are respectively arranged on both sides of the left half-shaft gear 101 and the right half-shaft gear 102. When limited slip is required, the limited slip mechanism 2 is matched with the left half-shaft gear 101 and the right half-shaft gear 102. The left and right half-shaft gears 101 and 102 are engaged, thereby releasing or locking (not rotating) the left and right half-shaft gears 101 and 102. When the limited slip mechanism 2 locks the left and right half-shaft gears 101 and 102, the transmission bracket 1, the left and right half-shaft gears 101 and 102 rotate at the same speed, thereby limiting the rotation of the left and right half-shaft gears 101 and 102 relative to the differential case, so that the torque is evenly distributed to the left and right wheels. At the same time, the limited slip mechanism 2 does not use a friction plate, which can avoid the slipping of the friction plate and is not limited by the torque of the friction plate.
[0028] In the prior art, the differential is a key automobile component, and its main function is to enable the front and rear drive wheels of the automobile to rotate at different speeds. This technology can ensure the stability and safety of the automobile under various driving conditions. However, the torque equalization characteristic of the ordinary differential makes it impossible to automatically adjust the torque distribution according to the road conditions. Under bad road conditions, it may cause a large difference in the speed of the wheels, affecting the stability and passability of the vehicle. The limited slip differential of the utility model is provided with a limited slip mechanism, which can adapt to a variety of road conditions. At the same time, under bad road conditions, the torque can be evenly distributed to the wheels on both sides to avoid slipping of one wheel. At the same time, there is no need to use a practical friction plate for limited slip, it is not limited by the torque of the friction plate, and can withstand a large torque.
[0029] In this embodiment, the slip limiting mechanism 2 includes a slip limiting member 201, and grooves 105 that cooperate with the slip limiting member 201 are respectively provided on the left half-shaft gear 101 and the right half-shaft gear 102. The slip limiting member 201 is clearance-matched with the transmission bracket 1 and can be driven away from or inserted into the groove 105 to release or lock the left half-shaft gear 101 and the right half-shaft gear 102; a groove 105 is provided on the back side of the left half-shaft gear 101 and the right half-shaft gear 102 (the side close to the transmission bracket housing after assembly), and a groove 105 is provided on the housing of the transmission bracket 1. There is a mounting hole, and the sliding limiter 201 is inserted into the mounting hole to match the housing clearance of the transmission bracket 1. At the same time, by controlling the movement of the sliding limiter 201, when the sliding limiter 201 is inserted into the groove 105, it is in a locked state, and when the sliding limiter 201 is out of the groove 105, it is in a released state. The structure of the sliding limiter 201 can be cylindrical or other shapes. At the same time, the number of sliding limiters 201 can be arranged in multiples according to the needs of use. The sliding limiter 201 and the groove 105 are matched to limit the slip, and there is no need to set a friction plate, which can make the structure more reliable and reduce the subsequent maintenance cost.
[0030] In this embodiment, a thrust block 202 is also included, and the thrust block 202 can be driven away from or close to the limited slip part 201; the thrust block 202 is a circular part, and is provided with a mating surface 2021 that cooperates with the limited slip part 201, and a mating surface 2022 that cooperates with the shell of the limited slip mechanism 2. The thrust block 202 is arranged in the shell 203 of the limited slip mechanism 2, and the thrust block 202 and the shell 203 of the limited slip mechanism 2 are clearance-matched. The movement of the limited slip part 201 is controlled by controlling the movement of the thrust block 202. When the thrust block 202 approaches the limited slip part 201, a force is applied to the limited slip part 201, so that the limited slip part 201 is inserted into the groove 105, thereby locking the left half-shaft gear 101 and the right half-shaft gear 102. The overall mechanical structure is matched, so that the structure is reliable and will not be affected by electromagnetic interference.
[0031] In this embodiment, an installation groove is provided on the sliding limiter 201, and an end face bearing 204 cooperating with the thrust block 202 is provided in the installation groove, so that the sliding limiter 201 can be driven to be inserted into or away from the groove 105; an installation groove is provided on one end of the sliding limiter 201 that is outside the shell of the transmission bracket 1, and an end face bearing 204 is provided in the installation groove. Through the cooperation of the end face bearing 204 and the thrust block 202, friction can be reduced while facilitating the bearing of a greater force.
[0032] In this embodiment, the limited slip mechanism 2 is provided with an oil channel 205, and the thrust block 202 is located on the oil channel 205 and is arranged corresponding to the outlet of the oil channel 205; the oil channel 205 is connected to the supply part of the pressurized working fluid (not shown), and the oil channel 205 is set in the limited slip mechanism 2. When it is necessary to lock the left half-shaft gear 101 and the right half-shaft gear 102 (the hydraulic structure can be controlled according to the existing controller, which is the application of the prior art and will not be repeated here), lubricating oil is introduced into the limited slip mechanism 2 through the oil channel 205, and the thrust block 202 is pushed to move through the hydraulic action, and then the limited slip member 201 is pushed to move. The operation of the limited slip mechanism 2 is driven by the hydraulic structure, and is not subject to electromagnetic interference during use, and the structure is more reliable.
[0033] In this embodiment, a sealing ring 206 is provided between the oil passage 205 and the thrust block 202 ; the sealing ring 206 is provided on the thrust block 202 to prevent oil leakage in the oil passage 205 and maintain pressure at the same time.
[0034] In this embodiment, two return springs 207 are also included for applying elastic force to the limited slip member 201, so that the limited slip member 201 moves away from the groove 105 to release the left half-shaft gear 101 and the right half-shaft gear 102; the return spring 207 is set, and when the left half-shaft gear 101 and the right half-shaft gear 102 need to be released, the supply of lubricating oil is stopped. At this time, the pressure in the limited slip mechanism 2 is reduced, and the elastic force of the return spring 207 makes the limited slip member 201 return to the initial position (that is, when the differential lock is not needed).
[0035] In this embodiment, a thrust block 106 is further provided on the transmission bracket 1, and the thrust block 106 is used to limit the displacement of the sliding limit member 201 moving to the left; the number of thrust blocks 106 can be set according to actual needs. When the sliding limit member 201 moves to the left ( Figure 1 ), or in the direction of moving closer to the groove 105, the thrust block 106 can prevent the sliding limiter 201 from moving too much to the left.
[0036] In this embodiment, a limit collar 208 is further provided on the sliding limit member 201, and the limit collar 208 is used to limit the displacement of the sliding limit member 201 moving to the right; the limit collar 208 is provided at one end of the sliding limit member 201 inserted into the transmission bracket 1, and when the sliding limit member 201 moves to the right ( Figure 1 In the embodiment of the present invention, the limit collar 208 can prevent the sliding member 201 from coming out of the transmission bracket 2, thereby improving the reliability of the overall structure.
[0037] In this embodiment, there are multiple grooves 105, and the width of the grooves 105 is greater than the width of the slip limiter 201; the grooves 105 are set to be multiple, and the width of the grooves 105 is greater than the width of the slip limiter 201, which facilitates the slip limiter 201 to insert into or detach from the grooves 105, thereby improving the use effect of the differential.
[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.
Claims
1. A limited slip differential, characterized in that: include: A differential body, wherein a transmission bracket is disposed in the differential body, the transmission bracket can rotate around a first axis, and a left half-shaft gear, a right half-shaft gear and a planetary gear meshing with the left half-shaft gear and the right half-shaft gear are disposed in the transmission bracket; The limited slip mechanism is respectively arranged on the left half-shaft gear and the right half-shaft gear, and is used for releasing or locking the left half-shaft gear and the right half-shaft gear, so that the left half-shaft gear and the right half-shaft gear have different or same rotation speeds as the transmission bracket.
2. The limited slip differential according to claim 1, characterized in that: The limited slip mechanism includes a limited slip part, and the left half-shaft gear and the right half-shaft gear are respectively provided with grooves that cooperate with the limited slip part. The limited slip part is clearance-matched with the transmission bracket and can be driven away from or inserted into the groove to release or lock the left half-shaft gear and the right half-shaft gear.
3. The limited slip differential according to claim 2, characterized in that: A thrust block is also included, and the thrust block can be driven away from or close to the slip limiting member.
4. The limited slip differential according to claim 3, characterized in that: The slip limiting member is provided with a mounting groove, and an end face bearing matched with the thrust block is provided in the mounting groove, so that the slip limiting member can be driven to be inserted into or away from the groove.
5. The limited slip differential according to claim 4, characterized in that: The limited slip mechanism is provided with an oil passage, and the thrust block is located on the oil passage and is arranged corresponding to the outlet of the oil passage.
6. The limited slip differential according to claim 5, characterized in that: A sealing ring is arranged between the oil channel and the thrust block.
7. The limited slip differential according to claim 3, characterized in that: It also includes two return springs for applying elastic force to the slip limiter so that the slip limiter is away from the groove and the left half-shaft gear and the right half-shaft gear are released.
8. The limited slip differential according to claim 3, characterized in that: It also includes a thrust block arranged on the transmission bracket, and the thrust block is used to limit the displacement of the sliding limiting member moving to the left.
9. The limited slip differential according to claim 8, characterized in that: It also includes a limit collar arranged on the sliding limiter, and the limit collar is used to limit the displacement of the sliding limiter to move to the right.
10. The limited slip differential according to claim 3, characterized in that: There are a plurality of grooves, and the width of each groove is greater than the width of the slip limiting member.