CN218863206U

CN218863206U - Four-planet high-strength differential axle

Info

Publication number: CN218863206U
Application number: CN202223363942.5U
Authority: CN
Inventors: 张宇荣
Original assignee: Wenling Huaxin Machinery Manufacturing Co ltd
Current assignee: Wenling Huaxin Machinery Manufacturing Co ltd
Priority date: 2022-12-15
Filing date: 2022-12-15
Publication date: 2023-04-14
Anticipated expiration: 2032-12-15

Abstract

The utility model discloses a four-planet high-strength differential axle, belonging to the technical field of vehicle transmission, comprising a differential shell, a left half-axle gear, a right half-axle gear, a planet gear shaft and four planet gears, wherein the differential shell comprises a big shell and a small shell which are buckled together, and four mounting holes are arranged on the big shell and are distributed at equal intervals; a planet carrier is also arranged in the differential mechanism shell, and four shaft holes which are distributed at equal intervals are arranged on the planet carrier along the circumferential surface; the planet gear shaft comprises a long shaft and two short shafts, the long shaft penetrates through two oppositely arranged shaft holes of the planet support, two ends of the long shaft are supported in two oppositely arranged mounting holes of the large shell, the inner side ends of the two short shafts are respectively penetrated in the other two shaft holes of the planet support, and the outer side ends of the two short shafts are respectively penetrated in the other two mounting holes of the large shell; the four planet gears are arranged between the planet support and the large shell and are respectively sleeved on two ends of the long shaft and the two short shafts. The utility model discloses intensity is high, can bear great moment of torsion, and the technology degree of difficulty is low.

Description

Four-planet high-strength differential axle

Technical Field

The utility model relates to a vehicle transmission technical field especially relates to a four stars high strength differential axle.

Background

The differential is an important component of a vehicle power transmission system and has the functions of realizing differential action when the rotating speeds of wheels on two sides of a driving shaft are inconsistent (such as vehicle turning), avoiding the wheels from dragging and slipping and reducing the running resistance and the tire wear. The common differential consists of a differential shell, a left half-shaft gear, a right half-shaft gear, a planet gear shaft and two planet gears, but the torque transmitted by the two planet gear differentials is small, and the requirement of large load cannot be met, so that the four planet gear differentials are adopted by vehicles with high load requirements, such as a wheel tractor, a small truck and the like.

A cross-shaped integrated planetary gear shaft is adopted in a common four-planetary-gear differential mechanism structure, a planetary gear is sleeved on each shaft neck, each planetary gear is respectively meshed with a left half shaft gear and a right half shaft gear simultaneously, in order to install the cross-shaped planetary gear shaft, a differential mechanism shell is divided into a left half shell and a right half shell along the center of a planetary shaft hole, and four shaft necks of the planetary gear shaft are embedded in holes formed by corresponding grooves on the end faces of the two half shells of the differential mechanism. In the structure, the perpendicularity and the position degree of the planet gear shaft, the perpendicularity and the position degree of the four planet shaft holes on the differential shell and the symmetry degree of the four planet shaft holes after the left half shell and the right half shell are combined all influence the positioning accuracy of the planet shaft of the differential, so that the loading uniformity of the planet gear is reduced, the process difficulty of parts is higher, and the manufacturing cost is high.

Chinese patent No. 201220068290.x discloses an insert shaft type four-star wheel differential for tractor, which comprises a differential housing, a housing rear seat and a large bevel gear, wherein the housing rear seat is supported at one side of an opening of the differential housing through a seam allowance, a left half axle gear, a planetary half axle, a right half axle gear and a planetary gear shaft are arranged in a closed cavity formed between the housing rear seat and the differential housing, and the housing rear seat, the differential housing and the large bevel gear are connected into a whole through fixing bolts. The outer sides of the two planet half shafts and two ends of the planet gear shaft are respectively supported on four shaft holes which are vertically intersected on the differential shell, and the inner sides of the two planet half shafts are supported in a radial hole which is vertical to the planet gear shaft and passes through the shaft center; a thrust bolt with an L-shaped notch at one end is inserted into the planetary half shaft and the outer shaft end of the planetary gear shaft with the L-shaped notch and fixed on the differential shell by nuts. In the structure, the four planetary gear shafts are divided into the planetary gear shaft and two half shafts, and the supporting and positioning of the four planetary gear shafts are ensured only by four shaft holes which are vertically crossed on the shell and one radial hole which is vertical and passes through the shaft center on the planetary gear shaft, so that the process is easy to realize. But has problems that: the inner sides of the two planet half shafts are supported in the radial holes of the planet gear shafts, the shaft diameters of the parts are small, the strength is low, when the automobile runs in a region with a severe road condition, the differential shell is easy to deform flexibly due to frequent turning or excessive torque generated by bumping, so that the inner sides of the planet half shafts are broken, and the differential is damaged.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that overcome above-mentioned problem, and provide a four planet high strength differential bridges that intensity is high, the technology degree of difficulty is low.

The technical scheme of the utility model is that:

a four-planet high-strength differential axle comprises a box body, a differential shell rotatably arranged in the box body, a transmission gear fixedly connected with the differential shell, and an input gear shaft penetrating into the box body and in meshing transmission with the transmission gear, wherein a left half shaft gear, a right half shaft gear, a planet gear shaft and four planet gears are arranged in the differential shell, and the four planet gears are arranged on the planet gear shaft and are respectively meshed with the left half shaft gear and the right half shaft gear simultaneously; the differential mechanism shell comprises a large shell and a small shell which are buckled together, the large shell and the small shell are fixedly connected through bolts, four mounting holes which are distributed at equal intervals are formed in the large shell along the circumferential surface, and a transmission gear is fixedly connected to the small shell; a ring-shaped planet carrier is also arranged in the differential shell, and four shaft holes which are distributed at equal intervals are formed in the planet carrier along the circumferential surface of the ring; the planet gear shaft comprises a long shaft and two short shafts, the long shaft penetrates through two oppositely arranged shaft holes of the planet support, two ends of the long shaft penetrate through and are supported in two oppositely arranged mounting holes of the large shell, and at least one end of the long shaft is fixed with the large shell through a pin shaft; the two short shafts are symmetrically arranged on two sides of the long shaft and are vertical to the long shaft, the inner side ends of the two short shafts are respectively penetrated and supported in the other two shaft holes of the planet support, and the outer side ends of the two short shafts are respectively penetrated and supported in the other two mounting holes of the large shell and are fixed with the large shell through pin shafts; the four planetary gears are arranged between the planetary support and the large shell, two of the four planetary gears are sleeved at two ends of the long shaft respectively, and the other two planetary gears are sleeved on the two short shafts respectively. The planet carrier is arranged, the planet gear shaft is divided into the long shaft and the two short shafts, the supporting and positioning accuracy is guaranteed only through four mounting holes in the shell and four shaft holes in the planet carrier, the process is easy to achieve, meanwhile, the planet carrier, the long shaft and the two short shafts are assembled into a whole, the outer diameters of the long shaft and the short shafts are large, bending resistance is large, the overall strength is high, large torque can be borne, the differential is not prone to fracture or deformation, normal work of the differential is guaranteed, and the service life of the differential is prolonged.

Preferably, in the four-planet high-strength differential axle, one end of the input gear shaft extending out of the box body is connected with a vehicle power output shaft through a universal connecting device, the universal connecting device comprises a first universal joint fork, a cross shaft and a second universal joint fork, the first universal joint fork and the second universal joint fork respectively comprise a joint fork body and two fork lugs, the cross shaft comprises a first shaft and a second shaft which are arranged in a vertical crossing mode, the two fork lugs of the first universal joint fork are rotatably connected with the two ends of the first shaft through bearings, the joint fork body is fixedly connected with the input gear shaft, the two fork lugs of the second universal joint fork are rotatably connected with the two ends of the second shaft through bearings, and the joint fork body is fixedly connected with the vehicle power output shaft. The input gear shaft is connected with the vehicle power output shaft through the universal connecting device, and the requirement on assembly precision can be lowered.

Furthermore, in the four-planet high-strength differential axle, the shaft portion of the input gear shaft is provided with an external spline, the joint yoke body of the first universal joint yoke is provided with a first internal spline matched with the joint yoke body, the shaft portion of the input gear shaft penetrates through the joint yoke body of the first universal joint yoke, the end portion of the shaft portion is provided with a connecting bolt, and the connecting bolt is screwed with a connecting nut to fixedly connect the first universal joint yoke and the input gear shaft.

Further, in the above four-planetary high-strength differential axle, a second internal spline for engaging with a vehicle power output shaft is provided in the yoke body of the second universal yoke.

Further, in the four-planet high-strength differential bridge, at least one end of the long shaft is provided with a pin hole which radially penetrates through the long shaft, the outer side ends of the two short shafts are provided with pin holes which radially penetrate through the short shafts, through holes which are matched with the pin holes of the long shaft and the pin holes of the short shafts are respectively arranged at corresponding positions on the large shell, the through holes are intersected with the mounting holes at the corresponding positions and are divided into a section of hole and a section of hole by the mounting holes, and the pin shaft sequentially penetrates through the section of hole, the pin holes and the section of hole to fix the long shaft, the short shafts and the large shell. The structure can effectively limit the axial movement and rotation of the long shaft and the two short shafts, and ensure the normal work of the differential.

Further, in the four-planet high-strength differential axle, adjusting gaskets are arranged between the outer end faces of the four planet gears and the large shell, and the adjusting gaskets are spherical gaskets. The adjusting shim is used for adjusting the meshing clearance between the planetary gear and the half axle gear, and meanwhile, the direct friction caused by contact between the planetary gear and the differential mechanism shell is avoided, so that the abrasion is reduced, and the service life of the differential mechanism is prolonged.

The beneficial effects of the utility model are that:

1. the planet support is arranged, the planet gear shaft is divided into a long shaft and two short shafts, the accuracy of supporting and positioning is ensured only by four mounting holes on the shell and four shaft holes on the planet support, and the process is easy to realize; the planet carrier, the long shaft and the two short shafts are assembled to form a whole, so that the strength is high, the large torque can be borne, the differential is not easy to break or deform, the normal work of the differential is ensured, and the service life of the differential is prolonged;

2. the input gear shaft is connected with the vehicle power output shaft through the universal connecting device, and the requirement on assembly precision can be reduced.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention.

Fig. 2 is an exploded view of the differential according to the embodiment of the present invention.

Fig. 3 is an assembly structure diagram of the planetary gear shaft in the embodiment of the present invention.

Fig. 4 is a perspective structure diagram of the universal connection device in the embodiment of the present invention.

In the figure: 1. a box body; 11. a transmission gear; 12. an input gear shaft; 121. a connecting bolt; 122. a connecting nut; 2. a differential housing; 21. a left side gear; 22. a right half shaft gear; 23. a planetary gear; 24. a large housing; 241. mounting holes; 25. a small housing; 26. a planet carrier; 261. a shaft hole; 27. adjusting the gasket; 3. a planetary gear shaft; 31. a long axis; 311. a pin hole; 32. a short axis; 321. a pin hole; 33. a pin shaft; 4a, a first universal joint fork; 4b, a second universal joint fork; 41. a yoke body; 42. a fork ear; 5. a cross shaft; 51. a first shaft; 52. a second shaft.

Detailed Description

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

in the description of the present invention, it should be understood that the directions or positional relationships indicated by the terms "left", "right", "inside", "outside", and the like are the directions or positional relationships shown in the drawings, and are only for convenience of description of the present invention, and do not indicate or imply that the device or element referred to must have a specific direction, and therefore, should not be construed as limiting the present invention.

Referring to fig. 1, the four-planet high-strength differential axle that this embodiment provided includes box 1, differential casing 2, drive gear 11 and input gear axle 12, and differential casing 2 rotates to be located in box 1, and drive gear 11 links firmly with differential casing 2, and input gear axle 12 wears to locate in box 1 and drive gear 11 meshing transmission. A left side gear 21, a right side gear 22, a planet gear shaft 3 and four planet gears 23 are arranged in the differential case 2, and the four planet gears 23 are arranged on the planet gear shaft 3 and are respectively meshed with the left and right side gears simultaneously. The differential case 2 comprises a big case 24 and a small case 25 which are buckled together, the big case 24 and the small case 25 are fixedly connected through bolts, four mounting holes 241 which are distributed equidistantly are arranged on the big case 24 along the circumferential surface, and the transmission gear 11 is fixedly connected on the small case 25.

As shown in fig. 1, 2 and 3, in order to reduce the process difficulty and improve the strength of the differential, a circular ring-shaped planet carrier 26 is further disposed in the differential case 2, four shaft holes 261 are disposed on the planet carrier 26 along the circumferential surface of the circular ring, and the planet shaft 3 is divided into a long shaft 31 and two short shafts 32. The long shaft 31 passes through two of the shaft holes 261 of the planet carrier 26, two ends of the long shaft 31 are supported in two of the mounting holes 241 of the large housing 24, and at least one end of the long shaft is fixed with the large housing 24 through the pin 33. The two short shafts 32 are symmetrically arranged on two sides of the long shaft 31 and are perpendicular to the long shaft 31, inner ends of the two short shafts 32 are respectively inserted and supported in the other two shaft holes 261 of the planet carrier 26, outer ends of the two short shafts are respectively inserted and supported in the other two mounting holes 241 of the large shell 24, and the two short shafts are fixed with the large shell 24 through the pin shaft 33. The four planet gears 23 are all arranged between the planet support 26 and the large shell 24, two of the planet gears are respectively sleeved at two ends of the long shaft 31, the other two planet gears are respectively sleeved on the two short shafts 32, adjusting gaskets 27 are arranged between the outer end surfaces of the four planet gears 23 and the large shell 24, and the adjusting gaskets 27 are spherical gaskets for reducing friction, reducing abrasion and adjusting gear meshing gaps.

Specifically, the fixed connection structure of the planet gear shaft 3 and the large housing 24 is as follows: at least one end of the long shaft 31 is provided with a pin hole 311 which radially penetrates through the long shaft 31, the outer ends of the two short shafts 32 are provided with pin holes 321 which radially penetrate through the short shafts 32, and the pin holes 311 of the long shaft 31 and the pin holes 321 of the short shafts 32 are parallel to the axes of the left and right semi-shaft gears; through holes 242 matched with the pin holes 311 and 321 of the long shaft 31 and the short shaft 32 are respectively formed in corresponding positions on the large shell 24, the through holes 242 are intersected with the mounting holes 241 in the corresponding positions and are divided into a section of hole and a section of hole by the mounting holes 241, and the pin shaft 33 sequentially penetrates through the section of hole, the pin holes and the section of hole to fix the long shaft 31 and the short shaft 32 with the differential shell 2, so that the axial movement and the rotation of the long shaft 31 and the two short shafts 32 are effectively limited.

In addition, as shown in fig. 1 and 4, in order to reduce the assembly accuracy requirement between the differential axle and the vehicle power output shaft, one end of the input gear shaft 12 extending out of the box body 1 is in transmission connection with the vehicle power output shaft (not shown) through a universal connection device. The universal connection device comprises a first universal joint fork 4a, a cross shaft 5 and a second universal joint fork 4b, wherein the first universal joint fork 4a and the second universal joint fork 4b respectively comprise a fork body 41 and two fork lugs 42, and the cross shaft 5 comprises a first shaft 51 and a second shaft 52 which are arranged in a vertical crossing mode. Two fork lugs 42 of the first universal fork 4a are rotatably connected with two ends of the first shaft 51 through bearings, and the fork body 41 is fixedly connected with the input gear shaft 12, specifically: the shaft portion of the input gear shaft 12 is provided with an external spline, the yoke body 41 of the first universal yoke 4a is provided with a first internal spline engaged therewith, the shaft portion of the input gear shaft 12 passes through the yoke body 41 of the first universal yoke 4a, the end portion of the shaft portion is provided with a connecting bolt 121, and the connecting bolt 121 is screwed with a connecting nut 122 so that the first universal yoke 4a is fixedly connected with the input gear shaft 12. Two fork ears 42 of second universal joint fork 4b are connected with the both ends of second axle 52 through the bearing rotation, and yoke body 41 and vehicle power output shaft fixed connection are specifically: a second internal spline for engaging with a vehicle power output shaft is provided in the yoke body 41 of the second yoke 4 b.

It should be understood that various other changes and modifications can be made by those skilled in the art based on the technical idea of the present invention, and all such changes and modifications should fall within the scope of the appended claims.

Claims

1. A four-planet high-strength differential axle comprises a box body, a differential shell rotatably arranged in the box body, a transmission gear fixedly connected with the differential shell, and an input gear shaft penetrating through the box body and in meshing transmission with the transmission gear, wherein a left half axle gear, a right half axle gear, a planet gear shaft and four planet gears are arranged in the differential shell, and the four planet gears are arranged on the planet gear shaft and are respectively meshed with the left half axle gear and the right half axle gear simultaneously; differential mechanism casing includes big casing, little casing that the lock is in the same place, big casing, little casing pass through bolt fixed connection, along global mounting hole of seting up four equidistance distributions on the big casing, drive gear links firmly on the little casing, its characterized in that: a circular planet support is also arranged in the differential mechanism shell, and four shaft holes which are distributed at equal intervals are formed in the planet support along the circumferential surface of a circular ring; the planet gear shaft comprises a long shaft and two short shafts, the long shaft penetrates through two oppositely arranged shaft holes of the planet support, two ends of the long shaft penetrate through and are supported in two oppositely arranged mounting holes of the large shell, and at least one end of the long shaft is fixed with the large shell through a pin shaft; the two short shafts are symmetrically arranged at two sides of the long shaft and are vertical to the long shaft, the inner side ends of the two short shafts are respectively penetrated and supported in the other two shaft holes of the planet support, and the outer side ends are respectively penetrated and supported in the other two mounting holes of the large shell and are fixed with the large shell through pin shafts; the four planetary gears are arranged between the planetary support and the large shell, two of the four planetary gears are sleeved at two ends of the long shaft respectively, and the other two planetary gears are sleeved on the two short shafts respectively.

2. The four-planet high-strength differential axle of claim 1, wherein: the universal joint device comprises a first universal joint fork, a cross shaft and a second universal joint fork, wherein the first universal joint fork and the second universal joint fork respectively comprise a joint fork body and two fork lugs, the cross shaft comprises a first shaft and a second shaft which are arranged in a vertical crossing mode, the two fork lugs of the first universal joint fork are connected with the two ends of the first shaft in a rotating mode through bearings, the joint fork body is fixedly connected with the input gear shaft, the two fork lugs of the second universal joint fork are connected with the two ends of the second shaft in a rotating mode through bearings, and the joint fork body is fixedly connected with a vehicle power output shaft.

3. The four-planet high-strength differential axle of claim 2, wherein: the shaft part of the input gear shaft is provided with an external spline, a first internal spline matched with the shaft part is arranged in the joint fork body of the first universal joint fork, the shaft part of the input gear shaft penetrates through the joint fork body of the first universal joint fork, the end part of the shaft part is provided with a connecting bolt, and a connecting nut is screwed on the connecting bolt to fixedly connect the first universal joint fork and the input gear shaft.

4. The four-planet high-strength differential axle of claim 3, wherein: and a second internal spline which is matched with a vehicle power output shaft is arranged in the yoke body of the second universal yoke.

5. The four-planet high-strength differential axle of claim 1, wherein: at least one end of the long shaft is provided with a pin hole which radially penetrates through the long shaft, the outer side ends of the two short shafts are provided with pin holes which radially penetrate through the short shafts, through holes which are matched with the pin holes of the long shaft and the pin holes of the short shafts are respectively arranged at corresponding positions on the large shell, the through holes are intersected with the mounting holes at corresponding positions and are divided into a section of hole and a section of hole by the mounting holes, and the pin shaft sequentially penetrates through the section of hole, the pin holes and the section of hole to fix the long shaft and the short shafts with the large shell.

6. Four-planet high-strength differential axle according to claim 1 or 5, characterized in that: adjusting gaskets are arranged between the outer end faces of the four planetary gears and the large shell, and the adjusting gaskets are spherical gaskets.