CN209977183U

CN209977183U - Mechanical self-locking differential mechanism

Info

Publication number: CN209977183U
Application number: CN201920446251.0U
Authority: CN
Inventors: 张宇荣
Original assignee: HUAXIN MACHINERY MANUFACTURING Co Ltd
Current assignee: HUAXIN MACHINERY MANUFACTURING Co Ltd
Priority date: 2019-04-03
Filing date: 2019-04-03
Publication date: 2020-01-21
Anticipated expiration: 2029-04-03

Abstract

The utility model relates to a mechanical auto-lock differential mechanism, including differential mechanism shell, planet axle, go up planetary gear, reaction block, lower planetary gear, self-locking mechanism, long, short half axle gear. The long half shaft gear and the short half shaft gear are meshed with the upper planetary gear and the lower planetary gear; the short half shaft gear is sleeved with a first friction plate group; the long half shaft gear is sequentially sleeved with a second friction plate group, a cam plate and a gear cam from inside to outside, the opposite surface of the cam plate and the gear cam is provided with a plurality of first cam grooves along the circumferential direction, the gear cam is correspondingly provided with a plurality of second cam grooves, the depths of the first cam grooves and the second cam grooves are gradually reduced from the center to two sides, and balls are arranged in a space formed by the first cam grooves and the second cam grooves in an opposite mode; a pressing spring for pre-pressing the cam disc is arranged between the second friction plate set and the cam disc in a propping manner; the gear cam is meshed with the self-locking mechanism. The structure has the advantages of wide adjustable range of locking coefficient, sensitive and rapid limited slip and simple and convenient processing.

Description

Mechanical self-locking differential mechanism

Technical Field

The utility model relates to a differential mechanism makes technical field, especially relates to mechanical auto-lock differential mechanism.

Background

The performance of the differential is directly related to the off-road performance of the automobile. The locking differentials in wide use at present mainly include friction plate type limited slip differentials, electronic induction limited slip differentials, tosen differentials, eaton differentials and the like.

The mechanical self-locking differential designed by the Eton company comprises a cam half-shaft gear and a half-shaft gear which are oppositely arranged, wherein a cam disc is arranged on the outer side of the cam half-shaft gear, a meshed cam inclined plane is formed on the opposite surfaces of the cam disc and the half-shaft gear, a friction plate group is arranged on the outer side of the cam disc, and external teeth meshed with a self-locking mechanism are arranged on the radial outer surface of the cam disc to realize locking. However, the eaton differential still has some disadvantages in use: the cam half shaft gear has the problems of complex processing, high processing difficulty and the like due to the cam inclined plane at the outer end; secondly, the engagement mode of the cam plate and the cam half-shaft gear is a plane cam type, a return spring is required to be arranged, the reaction speed is low, and the return lag is insensitive; and thirdly, the locking coefficient adjusting range is limited, and the limited slip performance cannot reach an ideal state.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that overcome above-mentioned problem, and provide a mechanical auto-lock differential mechanism, locking coefficient adjustable range is wide, the limit slip is sensitive rapidly, processing is simple and convenient.

The technical scheme of the utility model is that:

a mechanical auto-lock differential mechanism, including differential mechanism shell, planet axle, go up planetary gear, reaction block, lower planetary gear, self-locking mechanism, its characterized in that: the planetary gear train is characterized by also comprising a long half shaft gear and a short half shaft gear which are arranged on the left and right, wherein the long half shaft gear and the short half shaft gear are meshed with the upper planetary gear and the lower planetary gear; the short half shaft gear is sleeved with a first friction plate group; the long half shaft gear is sequentially sleeved with a second friction plate group, a cam plate and a gear cam from inside to outside, the opposite surface of the cam plate and the gear cam is provided with a plurality of first cam grooves along the circumferential direction, the gear cam is correspondingly provided with a plurality of second cam grooves, the depths of the first cam grooves and the second cam grooves are gradually reduced from the center to two sides, and balls are arranged in a space formed by the first cam grooves and the second cam grooves in an opposite mode; a compression spring for pre-compressing the cam disc is arranged between the second friction plate set and the cam disc in a propping manner; the gear cam is meshed with the self-locking mechanism.

By the structure, the utility model adopts the long and short half shaft gears to replace the original structural form of combining the cam half shaft gear and the half shaft gear, adopts the ball type cam structure, can independently process the cam disc and the half shaft gear, simplifies the processing technique, overcomes the technical defect of processing difficulty, and can realize quick return without arranging a return spring due to the rolling return of the ball; the friction plate is moved forwards between the cam structure and the half axle gear, so that the adjustable range of the locking coefficient is further improved, and a better limited-slip locking effect is achieved.

Further, in the mechanical self-locking differential of the present invention, the self-locking mechanism includes a gear shaft assembly and a self-locking shaft assembly;

the gear shaft assembly comprises a gear shaft, fixed blocks, two small throwing blocks, a compression spring and a clamp spring, one end of the gear shaft is meshed with a gear cam, the two fixed blocks are sleeved on the gear shaft, a fixed pin parallel to the gear shaft penetrates between the two fixed blocks, the two small throwing blocks are rotatably sleeved on the fixed pins in a sleeved mode and surround the gear shaft, and the clamp spring is coaxially sleeved on the fixed pins and is connected between the two small throwing blocks in a pressing mode; the compression spring is coaxially sleeved on the gear shaft and is connected between the two fixing blocks in a pressing manner; the outer end face of the small throwing block is provided with a hook-shaped locking face;

the self-locking shaft assembly comprises a self-locking shaft, a large throwing block and a torsional spring, the self-locking shaft is arranged in parallel with the gear shaft, the large throwing block is rotatably sleeved on the self-locking shaft, the torsional spring is sleeved on the self-locking shaft, one end of the torsional spring is connected with the large throwing block, and the other end of the torsional spring is connected with the gear shaft; the large throwing block is provided with a locking hook matched with the hook-shaped locking surface of the small throwing block, and the small throwing block is unfolded outwards and is hooked by the locking hook to realize locking connection.

Further, in the mechanical self-locking differential of the present invention, the first friction plate set and the second friction plate set each include a plurality of inner friction plates and outer friction plates which are alternately disposed.

Further, in the mechanical self-locking differential of the present invention, the long side gear is provided with a flat needle bearing at an end thereof contacting the differential case.

Further, in the mechanical self-locking differential of the present invention, the central axis of the gear shaft is parallel to the central axis of the gear cam.

Further, mechanical auto-lock differential mechanism in, go up planetary gear, be equipped with spherical packing ring between lower planetary gear and the differential mechanism shell respectively, can be used for protecting last planetary gear, lower planetary gear.

The utility model has the advantages that:

1. the utility model discloses simple structure, reasonable in design adopts long differential side gear to replace original cam differential side gear, has optimized the overall arrangement and the position of friction disc, has increased the adjustable range of locking coefficient, has solved the problem that the processing degree of difficulty of original cam differential side gear is high; meanwhile, the cam structure is optimized, the plane cam is changed into the ball cam, a return spring is not needed, and the return is more flexible and rapid.

2. The utility model discloses the range of application is wide, can be adapted to in front wheel drive, rear wheel drive or four wheel drive's vehicle, for example, can use on a front wheel drive's transaxle or in a four wheel drive's central transfer case, also be applicable to simultaneously in various manual fender, automatic fender vehicle and the new forms of energy electric automobile. In front wheel drive applications the side gears will drive the front axle of the vehicle, in rear wheel drive applications the side gears will drive the rear axle, and in four wheel drive applications the differential will be used to drive the front and rear drive shafts rather than the axle half shafts.

Drawings

Fig. 1 is a schematic structural view of a conventional mechanical self-locking differential of eaton corporation.

Fig. 2 is a cross-sectional view of the overall structure of the present invention.

Fig. 3 is a perspective view of the present invention.

Fig. 4 is a schematic structural diagram of the self-locking mechanism of the present invention.

Fig. 5 is a schematic structural diagram of the self-locking mechanism of the present invention.

Fig. 6 is a schematic structural diagram of the gear shaft assembly of the present invention.

Fig. 7 is a schematic diagram of the cooperation between the gear cam and the ball according to the present invention.

Detailed Description

The present invention will now be further described with reference to the accompanying drawings:

referring to fig. 2 and 3, the mechanical self-locking differential according to the present embodiment includes a differential case 1, a planetary shaft 2, an upper planetary gear 4, a reaction block 3, a lower planetary gear, and a self-locking mechanism, wherein spherical washers 15 are respectively disposed between the upper planetary gear 4, the lower planetary gear, and the differential case 1. The present embodiment further includes a long side gear 5 and a short side gear 6 disposed on the left and right, the long side gear 5 and the short side gear 6 are engaged with the upper planetary gear 4 and the lower planetary gear, and the long side gear 5 is provided with a flat needle bearing 14 at its end portion contacting the differential case 1. And a first friction plate group 7 is sleeved on the short half shaft gear 6. And a second friction plate group 8, a cam plate 9 and a gear cam 10 are sleeved on the long half shaft gear 5 from inside to outside in sequence. Referring to fig. 7, a plurality of first cam grooves 11 are formed in the circumferential direction of the cam disc 9 on the surface opposite to the gear cam 10, a plurality of second cam grooves are correspondingly formed in the gear cam 10, the depths of the first cam grooves 11 and the second cam grooves are gradually reduced from the center to two sides, and balls 12 are arranged in the space formed by the first cam grooves 11 and the second cam grooves; a pressing spring 13 for pre-pressing the cam disc 9 is also arranged between the second friction plate group 8 and the cam disc 9 in a propping manner; the gear cam 10 is meshed with the self-locking mechanism.

Specifically, the first friction plate set 7 and the second friction plate set 8 each include a plurality of inner friction plates and outer friction plates which are alternately arranged.

Referring to fig. 4 and 5, the self-locking mechanism of the present embodiment includes a gear shaft assembly and a self-locking shaft assembly.

With reference to fig. 6, the gear shaft assembly includes a gear shaft 16, fixed blocks 17, two small throwing blocks 19, a compression spring 21 and a clamp spring 20, the central axis of the gear shaft 16 is parallel to the central axis of the gear cam 10, one end of the gear shaft 16 is meshed with the gear cam 10, the two fixed blocks 17 are sleeved on the gear shaft 16, a fixed pin 18 parallel to the gear shaft 16 is arranged between the two fixed blocks 17 in a penetrating manner, the two small throwing blocks 17 are rotatably sleeved on the fixed pin 18 and surround the gear shaft 16, and the clamp spring 20 is coaxially sleeved on the fixed pin 18 and is connected between the two small throwing blocks 19 in a pressing manner; the compression spring 21 is coaxially sleeved on the gear shaft 16 and is connected between the two fixing blocks 17 in a pressing manner; the outer end face of the small throwing block 19 is provided with a hook-shaped locking face.

The self-locking shaft assembly comprises a self-locking shaft 22, a large throwing block 23 and a torsion spring 24, the self-locking shaft 22 is parallel to the gear shaft 16, the large throwing block 23 is rotatably sleeved on the self-locking shaft 22, the torsion spring 24 is sleeved on the self-locking shaft 22, one end of the torsion spring is connected with the large throwing block 23, and the other end of the torsion spring is connected with the gear shaft 16; the large throwing block 23 is provided with a locking hook matched with the hook-shaped locking surface of the small throwing block 19, and the small throwing block 19 is unfolded outwards and is hooked by the locking hook to realize locking connection.

When the two half shafts are differentiated, the long side gear 5 and the gear cam 10 start to rotate without rotating synchronously with the differential case 1, and the gear cam 10 is meshed with the gear shaft 16 to drive the gear shaft to rotate. When the difference of the rotating speeds is larger than a certain value, centrifugal force forces two small throwing blocks 19 on the gear shaft 16 to overcome the acting force of the clamp spring 20 and open outwards, and the hook-shaped locking surface on the outer side of the small throwing blocks is hooked and locked with the locking hook of the large throwing block 23, so that the aim of preventing the gear shaft 16 from rotating is fulfilled. At this time, the gear cam 10 stops rotating relative to the differential case 1, and the cam plate 9 and the long side gear 5 still have a certain tendency to rotate, so that the balls roll in the first cam groove 11 and the second cam groove, the cam plate 9 moves inwards and pushes and compresses the second friction plate group 8, and the long side gear 5 is locked with the differential case 1, and a good slip limiting effect is achieved. When the vehicle runs at high speed, the large throwing block 23 is thrown out, and the small throwing block 19 cannot be locked even if the large throwing block is thrown out, so that the safety of high-speed running is ensured. The structure is a pure mechanical device, can achieve locking without human intervention, can also achieve a certain limited slip coefficient according to the requirement, and has a wide adjustable range.

The specific embodiments described herein are merely illustrative of the principles of the present invention and its efficacy, and are not intended to limit the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Therefore, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical idea of the present invention shall be covered by the claims of the present invention.

Claims

1. The utility model provides a machinery auto-lock differential mechanism, includes differential mechanism shell, planet axle, goes up planetary gear, reaction block, lower planetary gear, self-locking mechanism, its characterized in that: the planetary gear train is characterized by also comprising a long half shaft gear and a short half shaft gear which are arranged on the left and right, wherein the long half shaft gear and the short half shaft gear are meshed with the upper planetary gear and the lower planetary gear; the short half shaft gear is sleeved with a first friction plate group; the long half shaft gear is sequentially sleeved with a second friction plate group, a cam plate and a gear cam from inside to outside, the opposite surface of the cam plate and the gear cam is provided with a plurality of first cam grooves along the circumferential direction, the gear cam is correspondingly provided with a plurality of second cam grooves, the depths of the first cam grooves and the second cam grooves are gradually reduced from the center to two sides, and balls are arranged in a space formed by the first cam grooves and the second cam grooves in an opposite mode; a compression spring for pre-compressing the cam disc is arranged between the second friction plate set and the cam disc in a propping manner; the gear cam is meshed with the self-locking mechanism.

2. The mechanical self-locking differential of claim 1, wherein: the self-locking mechanism comprises a gear shaft assembly and a self-locking shaft assembly;

3. The mechanical self-locking differential of claim 1, wherein: the first friction plate set and the second friction plate set respectively comprise a plurality of inner friction plates and a plurality of outer friction plates which are arranged alternately.

4. The mechanical self-locking differential of claim 1, wherein: the long half shaft gear is provided with a plane needle roller bearing on the end part contacting with the differential case.

5. The mechanical self-locking differential of claim 2, wherein: the central axis of the gear shaft is parallel to the central axis of the gear cam.

6. The mechanical self-locking differential of claim 1, wherein: spherical washers are respectively arranged among the upper planetary gear, the lower planetary gear and the differential shell.