Locking method and device of speed sensing differential lock
By setting up an inter-meshing cylindrical gear structure in the open differential, the locking method of speed-induced differential lock is realized, solving the shortcomings of the existing differential lock in torque distribution and slippage, and achieving the effect of instant response and automatic adjustment.
Patent Information
- Application Number
- CN202411836929.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-13
- Publication Date
- 2025-03-04
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
In some cases, existing differential locks cannot effectively achieve 100:0 torque distribution, and there are problems of hysteresis and friction coefficient reduction during slippage.
A speed-induced differential lock is designed, and synchronous rotation and rotation are achieved by setting up inter-meshing cylindrical gear structures inside the open differential, and the torque is locked when slipping is used using different transmission ratios.
It realizes normal torque distribution when the vehicle is driving in straight lines and corners, as well as instant locking and torque reallocation when the half-axle is slipping, avoiding the problem of escape caused by slipping, and responds automatically and without delay.
Smart Images
Figure CN119554381A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the field of differential locks applied to open differentials, and relates to a locking method and a device for a speed-sensitive differential lock. Background Art
[0002] Existing differential locks are roughly divided into the following types: tooth-type differential locks, high-friction self-locking differential locks, Torsen differential locks, and viscous coupling differential locks. Among them, the tooth-type differential locks must be switched when the vehicle is parked, the long-term use of high-friction differential locks will affect the friction coefficient, the Torsen type cannot achieve 100:0 torque distribution, and the viscous coupling type has hysteresis. Summary of the invention
[0003] The main object of the present invention is to provide a speed-sensitive differential lock to solve one or more of the above problems.
[0004] According to one aspect of the present invention, a locking method for a speed-sensitive differential lock is provided, wherein a pair of mutually meshing cylindrical gear structures are arranged between two half-shafts inside an open differential, the two half-shafts are respectively connected to two mutually meshing cylindrical gears, and each half-shaft and the cylindrical gear connected thereto rotate synchronously, and the revolution of the two mutually meshing cylindrical gears is synchronized with the rotation of the planetary wheel carrier of the open differential. When the half-shaft at one end of the open differential slips, the speed of the slipping end relative to the planetary wheel carrier is twice that of the planetary wheel carrier, while the mutually meshing cylindrical gears make the speed of the slipping end relative to the planetary wheel carrier be 1:1, and the purpose of locking is achieved by setting different transmission ratios.
[0005] According to one aspect of the present invention, a locking device of a speed-sensitive differential lock is provided, wherein the speed-sensitive differential lock is matched to an open differential, and a differential lock housing is constructed, and the differential lock housing is arranged on a planetary wheel carrier of the open differential, so that the differential lock and the planetary wheel carrier of the differential rotate synchronously; Construct a pair of mutually meshing cylindrical gears, wherein the pair of mutually meshing cylindrical gears are both rotatably arranged on the differential lock housing while maintaining mutual meshing, wherein there are two schemes; Solution 1: The pair of mutually meshing cylindrical gears are tiltedly arranged on the differential lock housing, and the pair of mutually meshing cylindrical gears are centrally symmetrical; Transmission bevel gears, the transmission bevel gears are respectively fixedly arranged on different sides of the two mutually meshing cylindrical gears; Axle bevel gears, the axle bevel gears are rotatably arranged at the center positions of both sides of the differential lock housing, the two axle bevel gears are hollow structures, the two axle bevel gears are connected to the two axle shafts through splines, the two axle bevel gears are respectively meshed with the two transmission bevel gears, and the mutually meshing axle bevel gears and the transmission bevel gears can be replaced by universal joints; Solution 2: The pair of mutually meshing cylindrical gears are vertically arranged on the differential lock housing, and the pair of mutually meshing cylindrical gears are axially symmetrical; Universal joints, one end of the two universal joints is rotatably arranged at the center position of both sides of the differential lock housing, and is connected to the two half shafts through splines, and the other end of the two universal joints is fixedly connected to different ends of the two cylindrical gears.
[0006] With this structure, when the vehicle is traveling in a straight line, the planetary wheel carrier of the open differential rotates synchronously with the two half-shafts, that is, the differential lock housing also rotates synchronously with the two half-shafts, and the speed of the two half-shafts relative to the differential lock housing is zero; When the vehicle is driving on a curve, the design of the mutually meshing cylindrical gears of the differential lock makes the two half-axles have to move at the same speed but in opposite directions relative to the differential lock housing, and the vehicle turns so that the two half-axles actively accelerate and decelerate relative to the differential housing respectively. Therefore, the setting of the differential lock is not affected when the vehicle is driving on a curve; When one side of the two half-shafts slips or is suspended, the non-slipping side will become stationary, and the open differential will distribute all the torque to the slipping side, tending to make the rotation speed of the slipping side twice that of the planetary carrier. The differential lock is designed with a pair of intermeshing cylindrical gears, so that when one half-shaft is stationary, the half-shaft on the slipping side can only rotate synchronously with the planetary carrier. Compared with the open differential, the synchronous rotation of one half-shaft and the planetary carrier means locking, so the torque is redistributed to the non-slipping end, thereby getting out of trouble. The whole process responds instantly, adjusts automatically, has no delay, and has a simple structure. BRIEF DESCRIPTION OF THE DRAWINGS
[0007] As shown in the figure, Figure 1 It is a structural diagram of differential lock scheme 1. Figure 2 This is the structural diagram of differential lock scheme 2. Among them, 1. differential lock housing, 2. cylindrical gear, 3. transmission bevel gear, 4. half-shaft bevel gear, 5. half-shaft, 6. differential planetary gear carrier connection position, 7. differential lock housing, 8. cylindrical gear, 9. universal joint, 10. half-shaft, 11. differential planetary gear carrier connection position. Specific embodiments
[0008] The following will provide a clear and complete description of the solutions in the embodiments of the present invention in conjunction with the embodiments of the present invention; The differential lock structure is arranged between two half shafts inside the open differential; like Figure 1 As shown, the differential lock housing 1 and the differential planetary wheel carrier connection position 6, the differential planetary wheel carrier connection position 6 is fixedly arranged on the differential lock housing 1, and the differential planetary wheel carrier connection position 6 is fixedly arranged on the planetary wheel carrier of the open cylindrical gear differential, or is arranged on the planetary wheel shaft of the open bevel gear differential, so as to ensure that the differential lock housing 1 and the planetary wheel carrier of the open differential rotate synchronously; A cylindrical gear 2, a pair of mutually meshing cylindrical gears 2 are rotatably arranged in the differential lock housing 1, and a pair of mutually meshing cylindrical gears 2 are tilted and centrally symmetrically arranged in the differential lock housing 1; Transmission bevel gears 3, wherein two transmission bevel gears 3 are respectively fixedly arranged on different sides of a pair of mutually meshing cylindrical gears; Axle bevel gears 4, two of which are rotatably arranged at the center positions of both sides of the differential lock housing 1, the axle bevel gears 4 are hollow, and the two axle bevel gears 4 are respectively meshed with the two transmission bevel gears 3; A half shaft 5, wherein the two half shafts 5 are two half shafts of an open differential, and the two half shafts 5 are connected to the two half shaft bevel gears through splines; As shown in the structure of scheme 1, the half-shaft bevel gear 4 is connected to the half-shaft 5 through a spline, and the transmission bevel gear 3 is fixedly arranged on a pair of mutually meshing cylindrical gears 2. The half-shaft bevel gear 4 meshes with the transmission bevel gear 3, which in fact constitutes the meshing of two half-shafts 5; Since the half-shaft bevel gear 4 and the cylindrical gear 2 are both rotatably arranged on the differential lock housing 1, when one of the half-shafts 5 is in a stationary state, the other half-shaft 5 can rotate synchronously with the differential lock housing 1. At this time, among the pair of mutually meshing cylindrical gears 2, the cylindrical gear 2 connected to the half-shaft 5 in a stationary state is in a state of only orbital revolution but not self-rotation. like Figure 2 As shown, the differential lock housing 7 and the differential planetary wheel carrier connection position 11, the differential planetary wheel carrier connection position 11 is fixedly arranged on the differential lock housing 7, and the differential planetary wheel carrier connection position 11 is fixedly arranged on the planetary wheel carrier of the open cylindrical gear differential, or is arranged on the planetary wheel shaft of the open bevel gear differential, so as to ensure that the differential lock housing 7 and the planetary wheel carrier of the open differential rotate synchronously; A cylindrical gear 8, a pair of mutually meshing cylindrical gears 8 are rotatably arranged in the differential lock housing 7, and a pair of mutually meshing cylindrical gears 8 are vertically arranged in a symmetrical manner in the differential lock housing 7; Universal joints 9, one end of the two universal joints 9 being rotatably disposed at the center positions of both sides of the differential lock housing 7, and the other ends of the two universal joints 9 being fixedly disposed on different sides of two mutually meshing cylindrical gears 8; A half shaft 10, wherein the two half shafts 10 are two half shafts of an open differential, and the two half shafts 10 are connected to the two universal joints 9 via splines; As shown in the structure of the second scheme, the two half shafts 10 are respectively connected to the two mutually meshing cylindrical gears 8 through the universal joints 9, that is, in fact, the two half shafts 10 are in a mutually meshing state; The two universal joints 9 and the two mutually meshing cylindrical gears 8 are rotatably arranged on the differential lock housing 7, so that when one of the half-shafts 10 is in a stationary state, the other half-shaft 10 can rotate synchronously with the differential lock housing 7. At this time, among the pair of mutually meshing cylindrical gears 8, the cylindrical gear 8 connected to the half-shaft 10 in a stationary state is in a state of only orbital revolution but not rotation.
[0009] In these two embodiments, the structure of the first solution is the same as that of the second solution in principle and effect, so only the second solution is used to describe the locking state; With this structure, when the vehicle is traveling in a straight line, the planetary wheel carrier of the open differential rotates synchronously with the two half-shafts 10, that is, the differential lock housing 7 also rotates synchronously with the two half-shafts 10, and the speed of the two half-shafts 10 relative to the differential lock housing 7 is zero, so the setting of the differential lock does not affect the normal driving of the vehicle; When the vehicle is traveling on a curve, the design of the two mutually meshing cylindrical gears 8 of the differential lock makes the two half shafts 10 have the same speed but opposite directions relative to the differential lock housing 7, and the vehicle turns so that the two half shafts 10 actively accelerate and actively decelerate relative to the differential housing 7, therefore, the setting of the differential lock when the vehicle is traveling on a curve also does not affect the normal driving of the vehicle; When one side of the two half-shafts 10 slips or is suspended, the non-slip side will be in a stationary state, and the open differential will distribute all the torque to the slipping side, that is, it tends to make the rotation speed of the half-shaft 10 on the slipping side twice the rotation speed of the planetary carrier. The design of the pair of mutually meshing cylindrical gears 8 of the differential lock makes it possible for the half-shaft 10 on the slipping side to only rotate synchronously with the differential lock housing 7 or the planetary carrier when one side of the half-shaft 10 is stationary. Compared with the open differential, the synchronous rotation of one side of the half-shaft 10 and the planetary carrier means locking, so the torque is redistributed to the non-slipping end, thereby getting out of trouble. The whole process responds instantly, adjusts automatically, has no delay, and the structure is not complicated.
[0010] The above are only preferred embodiments of the present invention and are not intended to limit the invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A locking method and device for a speed-sensitive differential lock, characterized in that: A pair of mutually meshing cylindrical gear structures are arranged between the two half-shafts inside the open differential. The two half-shafts are respectively connected to two mutually meshing cylindrical gears, and each half-shaft and the cylindrical gear connected thereto rotate synchronously. The revolution of the two mutually meshing cylindrical gears is synchronized with the rotation of the planetary wheel carrier of the open differential. When the half-shaft at one end of the open differential slips, the speed of the slipping end relative to the planetary wheel carrier is twice that of the planetary wheel carrier, while the mutually meshing cylindrical gears make the speed of the slipping end relative to the planetary wheel carrier be 1:
1. The purpose of locking is achieved by setting different transmission ratios.
2. The locking device of a speed-sensitive differential lock according to claim 1, characterized in that: The differential lock structure is arranged between two half shafts inside the open differential; As shown in FIG1 , a differential lock housing 1 and a differential planetary wheel carrier connection position 6, wherein the differential planetary wheel carrier connection position 6 is fixedly arranged on the differential lock housing 1, and the differential planetary wheel carrier connection position 6 is fixedly arranged on the planetary wheel carrier of an open cylindrical gear differential, or is arranged on the planetary wheel shaft of an open bevel gear differential, so as to ensure that the differential lock housing 1 and the planetary wheel carrier of the open differential rotate synchronously; A cylindrical gear 2, a pair of mutually meshing cylindrical gears 2 are rotatably arranged in the differential lock housing 1, and a pair of mutually meshing cylindrical gears 2 are tilted and centrally symmetrically arranged in the differential lock housing 1; Transmission bevel gears 3, wherein two transmission bevel gears 3 are respectively fixedly arranged on different sides of a pair of mutually meshing cylindrical gears; Axle bevel gears 4, two of which are rotatably arranged at the center positions of both sides of the differential lock housing 1, the axle bevel gears 4 are hollow, and the two axle bevel gears 4 are respectively meshed with the two transmission bevel gears 3; The half shafts 5 are two half shafts of an open differential, and the two half shafts 5 are connected to the two half shaft bevel gears via splines.
3. The locking device of a speed-sensitive differential lock according to claim 1, characterized in that: As shown in FIG2 , the differential lock housing 7 and the differential planetary wheel carrier connection position 11, the differential planetary wheel carrier connection position 11 is fixedly arranged on the differential lock housing 7, and the differential planetary wheel carrier connection position 11 is fixedly arranged on the planetary wheel carrier of the open cylindrical gear differential, or arranged on the planetary wheel shaft of the open bevel gear differential, so as to ensure that the differential lock housing 7 and the planetary wheel carrier of the open differential rotate synchronously; A cylindrical gear 8, a pair of mutually meshing cylindrical gears 8 are rotatably arranged in the differential lock housing 7, and a pair of mutually meshing cylindrical gears 8 are vertically arranged in a symmetrical manner in the differential lock housing 7; Universal joints 9, one end of the two universal joints 9 being rotatably disposed at the center positions of both sides of the differential lock housing 7, and the other ends of the two universal joints 9 being fixedly disposed on different sides of two mutually meshing cylindrical gears 8; The half shafts 10 are two half shafts of an open differential, and the two half shafts 10 are connected to the two universal joints 9 via splines.