阅读说明：本技术 一种用于汽车贯通式驱动桥的轴间差速器总成及其滚针组 (Interaxial differential assembly for automobile through type drive axle and needle roller set thereof ) 是由 丁炜琦 张龙 胡烜华 赵冰 巩占峰 于 2019-10-25 设计创作，主要内容包括：本发明公开了一种用于汽车贯通式驱动桥的轴间差速器总成,该总成的主动圆柱齿轮和半轴齿轮分别同轴并通过滚针轴承转动装配在主轴上,每个所述行星齿轮均内设阶梯孔,十字轴的四个分轴均插入相应的阶梯孔内,且十字轴与相应的行星齿轮阶梯孔内壁之间通过设置一圈滚针实现转动连接。本发明还提供了一种应用于上述轴间差速器总成的滚针组及十字轴处滚针的安装方法。本发明将十字轴与行星齿轮之间的滚针设计,能够降低摩擦损失,可在有限空间内,最大限度增加滚针宽度,提高承载能力；主动圆柱齿轮与主轴之间、半轴齿轮与主轴之间采用滚针轴承,可最大限度地减少径向尺寸的占用,提升主轴的承载能力。(The invention discloses an interaxial differential assembly for a through type drive axle of an automobile, wherein a driving cylindrical gear and a half axle gear of the assembly are respectively coaxial and are rotatably assembled on a main shaft through a needle roller bearing, a stepped hole is formed in each planetary gear, four sub-shafts of a cross shaft are inserted into corresponding stepped holes, and the cross shaft is rotatably connected with the inner wall of the corresponding stepped hole of the planetary gear through a circle of needle roller. The invention also provides a roller pin group applied to the inter-axle differential assembly and an installation method of the roller pins at the cross shaft. According to the invention, the roller pins between the cross shafts and the planetary gears are designed, so that the friction loss can be reduced, the width of the roller pins can be increased to the maximum extent in a limited space, and the bearing capacity is improved; needle roller bearings are adopted between the driving cylindrical gear and the main shaft and between the half axle gear and the main shaft, so that the occupation of radial dimension can be reduced to the maximum extent, and the bearing capacity of the main shaft is improved.)

1. An interaxle differential assembly for a through drive axle of an automobile, comprising a main shaft (11), and a cross shaft (2) coaxially assembled outside the main shaft (11) through splines, characterized in that: the driving cylindrical gear (3) and the half axle gear (4) are coaxially and rotatably assembled at the front end and the rear end of a main shaft (11) respectively, the four planetary gears (6) are coaxially assembled on corresponding split shafts of a cross shaft (2) respectively, the front end of each planetary gear (6) is meshed with the driving cylindrical gear (3), the rear end of each planetary gear (6) is meshed with the half axle gear (4), a stepped hole (13) is formed in each planetary gear (6), the four split shafts of the cross shaft (2) are inserted into the corresponding stepped holes (13), and a circle of needle roller (7) is arranged between the cross shaft (2) and the inner wall of the corresponding stepped hole (13) of the planetary gear (6) to realize rotary connection.

2. An interaxle differential assembly for a through-drive axle of an automobile according to claim 1 wherein: the driving cylindrical gear (3) is rotatably connected with the main shaft (11) by a needle bearing (9) with a retainer.

3. An interaxle differential assembly for a through-drive axle of an automobile according to claim 1 wherein: the side gear (4) and the main shaft (11) are rotationally connected by a needle bearing (9) with a retainer.

4. An interaxle differential assembly for a through-drive axle of an automobile according to claim 2 or 3 wherein: the needle roller bearing (9) is a double-row needle roller bearing.

5. An inter-axle differential assembly for a through drive axle of an automobile according to any one of claims 1-3, wherein: and a gasket (8) is sleeved on one side of the branch shaft of each cross shaft (2) close to the axis of the branch shaft.

6. An inter-axle differential assembly for a through drive axle of an automobile according to any one of claims 1-3, wherein: still coaxial cover is equipped with side gear gasket (5) on main shaft (11), just side gear gasket (5) are arranged in between main shaft (11) and side gear (4).

7. An inter-axle differential assembly for a through drive axle of an automobile according to any one of claims 1-3, wherein: the outer side of the planetary gear (6) is further coated with an inter-axle differential case (1) of which the inner wall is provided with a circle of oil groove structure (12).

8. The utility model provides a be applied to above-mentioned interaxle differential assembly's kingpin group which characterized in that: comprises a circle of rolling needles (7), a soft inner matching set (15) and a soft outer matching set (16) which are respectively prefabricated on the inner ring and the outer ring of the rolling needles (7), so that the rolling needles (7) are uniformly distributed between the inner matching set (15) and the outer matching set (16) through the extrusion action.

9. A needle roller set in accordance with claim 8, wherein: the length of the inner matching sleeve (15) and the length of the outer matching sleeve (16) are both smaller than that of the roller pin (7), the end, opposite to the initial pressing end of the roller pin set, of the outer matching sleeve (16) is shorter than the end part of the roller pin (7), and the end, opposite to the initial pressing end of the cross shaft (2), of the inner matching sleeve (15) is shorter than the end part of the roller pin (7).

10. A method for installing a roller pin at a cross shaft in an inter-axle differential assembly is characterized by comprising the following steps: the method comprises the following steps:

step 1, prefabricating a circle of soft inner matching set (15) and a circle of soft outer matching set (16) on the inner ring and the outer ring of a rolling needle (7) respectively, enabling the rolling needle (7) to be uniformly distributed between the inner matching set (15) and the outer matching set (16), ensuring that the lengths of the inner matching set (15) and the outer matching set (16) are smaller than the rolling needle (7), shortening one end, opposite to the initial pressing end of the rolling needle set, of the outer matching set (16) to the end part of the rolling needle (7), shortening one end, opposite to the initial pressing end of the cross shaft (2), of the inner matching set (15) to the end part of the rolling needle (7), and finally forming a rolling needle set;

step 2, pressing the needle rolling group (14) into a stepped hole (13) of the planetary gear (6), and then taking out the outer assembly sleeve (16);

and 3, taking the cross shaft (2) to assemble the gasket (8), pressing each sub-shaft of the cross shaft (2) into the stepped hole (13) of the corresponding planetary gear (6) in the step 2, placing a circle of rolling needles (7) with the built-in matching (15) between the cross shaft (2) and the inner wall of the stepped hole (13), and finally taking out the built-in matching (15) to finish assembly.

Technical Field

The invention belongs to the technical field of interaxle differentials, and particularly relates to an interaxle differential assembly for a through drive axle of an automobile.

Background

At present, in an interaxle differential assembly of a through drive axle of an automobile, a side gear is in a bushing structure in the radial direction, and a cross shaft is directly matched with a planetary wheel hole in the radial direction or after being subjected to thermal treatment by using a bushing or a surface. The mode has high requirement on lubricating conditions, poor bearing capacity and high maintenance cost, and ablation is easy to generate, so that the whole set of gear train is replaced.

Disclosure of Invention

The invention is realized by the following technical scheme:

the invention provides an interaxial differential assembly for a through-type drive axle of an automobile, which comprises a main shaft, a cross shaft coaxially assembled on the outer side of the main shaft through splines, a driving cylindrical gear, four planetary gears and a half axle gear, wherein the driving cylindrical gear and the half axle gear are coaxially and rotatably assembled at the front end and the rear end of the main shaft respectively, the four planetary gears are coaxially assembled on corresponding sub-shafts of the cross shaft respectively, the front end of each planetary gear is meshed with the driving cylindrical gear, the rear end of each planetary gear is meshed with the half axle gear, a stepped hole is formed in each planetary gear, the four sub-shafts of the cross shaft are inserted into the corresponding stepped holes, and a circle of needle rollers are arranged between the cross shaft and the inner wall of the corresponding stepped hole of the planetary gear to realize rotary connection.

Preferably, the driving cylindrical gear and the main shaft are rotationally connected by a needle bearing with a retainer.

Preferably, the side gear and the main shaft are rotationally connected by a needle bearing with a retainer.

More preferably, the needle bearing is a double-row needle bearing.

Preferably, a gasket is sleeved on one side, close to the axis, of each sub-shaft of each cross shaft.

Preferably, a side gear gasket is further coaxially sleeved on the main shaft and is arranged between the main shaft and the side gear.

Preferably, the outer side of the planetary gear is further coated with an inter-axle differential case of which the inner wall is provided with a circle of oil groove structure.

The invention provides a roller pin group applied to the inter-axle differential assembly, which comprises a circle of roller pins, and a soft inner matching set and a soft outer matching set which are respectively prefabricated on the inner ring and the outer ring of the roller pins, so that the roller pins are uniformly distributed between the inner matching set and the outer matching set through the extrusion action.

Preferably, the length of the inner and outer sleeves is less than that of the roller pin, the end of the outer sleeve opposite to the initial pressing end of the roller pin set is shorter than the end part of the roller pin, and the end of the inner sleeve opposite to the initial pressing end of the cross shaft is shorter than the end part of the roller pin.

The invention provides a method for installing a roller pin at a cross shaft in an inter-axle differential assembly, which comprises the following steps:

step 1, prefabricating a circle of soft inner matching and soft outer matching respectively on the inner ring and the outer ring of the roller pins, enabling the roller pins to be uniformly distributed between the inner matching and the outer matching, ensuring that the lengths of the inner matching and the outer matching are smaller than the roller pins, enabling one end of the outer matching, which is opposite to the initial pressure-in end of the roller pin set, to be shorter than the end part of the roller pins, and enabling one end of the inner matching, which is opposite to the initial pressure-in end of the cross shaft, to be shorter than the end part of the roller;

step 2, pressing the needle roller set into a stepped hole of the planetary gear, and then taking out the outer sleeve;

and 3, taking the cross shaft to assemble the gasket, pressing each sub-shaft of the cross shaft into the corresponding stepped hole of the planetary gear in the step, placing a circle of roller pin with an internal matching between the cross shaft and the inner wall of the stepped hole, and finally taking out the internal matching to finish assembly.

Compared with the prior art, the invention has the following beneficial technical effects:

(1) the friction pair between the cross shaft and the planetary gear in the traditional interaxial differential is changed into linear contact rolling friction, so that the friction loss is reduced; the pure roller pins are adopted, so that the width of the roller pins can be increased to the maximum extent in a limited space, and the bearing capacity is improved;

(2) according to the invention, the double-row needle roller bearing with the retainer is adopted between the driving cylindrical gear and the main shaft, so that the occupation of the radial dimension can be reduced to the maximum extent, the shaft diameter of the main shaft is ensured, and the bearing capacity of the main shaft is improved;

(3) according to the invention, the needle roller bearing is adopted between the half axle gear and the main shaft, so that the friction and the bearing capacity can be effectively improved;

(4) the oil groove structure arranged in the middle of the interaxial differential shell is beneficial to lubricating a gear train and a bearing;

(5) in the needle roller set designed by the invention, the lengths of the internal and external matching sets are set to be smaller than that of the needle roller, the end of the external matching set opposite to the initial pressure-in end of the needle roller set is ensured to be shorter than the end part of the needle roller, and the end of the internal matching set opposite to the initial pressure-in end of the cross shaft is ensured to be shorter than the end part of the needle roller.

Drawings

FIG. 1 is a schematic structural view of an interaxle differential assembly;

FIG. 2 is a schematic view of a needle roller set;

FIG. 3 is a flow chart of installation of the needles at the cross-pin in the inter-axle differential assembly.

Description of the reference numerals

1. An inter-axle differential case; 2. a cross shaft; 3. a driving cylindrical gear; 4. a half shaft gear; 5. a half-shaft gear spacer; 6. a planetary gear; 7. rolling needles; 8. a gasket; 9. a needle bearing; 11. a main shaft; 12. an oil sump structure; 13. a stepped hole; 14. a needle rolling group; 15. the inside is matched; 16. the external package is matched.

Detailed Description

In order that the above objects, features and advantages of the present invention can be more clearly understood, a detailed description of the present invention will be given below with reference to the accompanying drawings and specific embodiments. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth to provide a thorough understanding of the present invention, and the described embodiments are merely a subset of the embodiments of the present invention, rather than a complete embodiment. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example 1

As shown in fig. 1, an interaxle differential assembly for a through-drive axle of an automobile includes a main shaft 11, a cross shaft 2 coaxially fitted outside the main shaft 11 through splines, a driving cylindrical gear 3, four planetary gears 6, and a side gear 4, the driving cylindrical gear 3 and the half axle gear 4 are respectively coaxially and rotatably assembled at the front end and the rear end of the main shaft 11, the four planet gears 6 are respectively coaxially assembled on the corresponding split shafts of the cross shaft 2, the front end of each planet gear 6 is meshed with the driving cylindrical gear 3, the rear end of each planet gear 6 is meshed with the half axle gear 4, a stepped hole 13 is formed in each planet gear 6, four branch shafts of the cross shaft 2 are inserted into the corresponding stepped holes 13, and the cross shaft 2 is rotatably connected with the inner wall of the stepped hole 13 of the corresponding planetary gear 6 through a circle of rolling needle 7.

Compared with the traditional assembly, the inter-axle differential assembly provided by the invention has the advantages that the friction pair between the cross shaft 2 and the planetary gear 6 is changed into linear contact rolling friction, so that the friction loss is reduced; and the pure rolling needles 7 are adopted, so that the width of the rolling needles can be increased to the maximum extent in a limited space, and the bearing capacity is improved.

The driving cylindrical gear 3 and the main shaft 11 can be preferably rotationally connected by using a needle bearing 9 with a retainer, and the side gear 4 and the main shaft 11 can be preferably rotationally connected by using the needle bearing 9 with a retainer.

The needle bearing 9 may be more preferably a double-row needle bearing.

By adopting the double-row needle roller bearing with the retainer between the driving cylindrical gear 3 and the main shaft 11, the occupation of the radial dimension can be reduced to the maximum extent, thereby ensuring the shaft diameter of the main shaft and improving the bearing capacity of the main shaft; and a needle bearing is adopted between the side gear 4 and the main shaft 11 to improve the friction and the bearing capacity, and in addition, the side gear 4 and the main shaft 11 can also realize the rotary connection by adopting a common bushing.

In order to improve the assembling tightness between the cross shafts 2 and the corresponding planetary gears 6, a gasket 8 is sleeved on one side, close to the axis, of each branch shaft of each cross shaft 2.

In order to improve the assembling tightness between the main shaft 11 and the side gear 4, a side gear gasket 5 is further coaxially sleeved on the main shaft 11, and the side gear gasket 5 is arranged between the main shaft 11 and the side gear 4.

In order to help the lubrication of a gear train and a bearing, the outer side of the planetary gear 6 is further coated with the inter-axle differential case 1, the inner wall of the inter-axle differential case 1 is provided with the circle of oil groove structure 12, and the arrangement of the circle of oil groove structure 12 can guide the flow of lubricating oil injected into the inter-axle differential case 1, so that the lubricating oil can flow onto the planetary gear 6 more conveniently.

Example 2

As shown in fig. 2, a needle roller set 14 applied to the inter-axle differential assembly includes a ring of needle rollers 7, a soft inner set 15 and a soft outer set 16 which are prefabricated at inner and outer rings of the needle rollers 7, respectively, so that the needle rollers 7 are uniformly distributed between the inner set 15 and the outer set 16 by a squeezing action.

Specifically, the lengths of the inner sleeve 15 and the outer sleeve 16 are both smaller than the length of the needle roller 7, the end of the outer sleeve 16 opposite to the initial pressing end of the needle roller set is shorter than the end of the needle roller 7, and the end of the inner sleeve 15 opposite to the initial pressing end of the cross shaft 2 is shorter than the end of the needle roller 7.

Example 3

A method for installing a roller pin at a cross shaft in an inter-axle differential assembly comprises the following steps:

step 1, prefabricating a circle of soft inner matching set 15 and a circle of soft outer matching set 16 on the inner ring and the outer ring of the roller pin 7 respectively, enabling the roller pin 7 to be uniformly distributed between the inner matching set 15 and the outer matching set 16, ensuring that the lengths of the inner matching set 15 and the outer matching set 16 are both smaller than the roller pin 7, enabling one end, opposite to the initial pressing end of the roller pin set, of the outer matching set 16 to be shorter than the end part of the roller pin 7, enabling one end, opposite to the initial pressing end of the cross shaft 2, of the inner matching set 15 to be shorter than the end part of the;

step 2, pressing the needle roller group 14 into a stepped hole 13 of the planetary gear 6, and then taking out the outer assembly sleeve 16;

and 3, assembling a gasket 8 on the cross shaft 2, pressing each sub-shaft of the cross shaft 2 into the corresponding stepped hole 13 of the planetary gear 6 in the step 2, placing a circle of rolling needle 7 with an internal matching 15 between the cross shaft 2 and the inner wall of the stepped hole 13, and finally taking out the internal matching 15 to finish assembly.

The needle roller set and the needle roller mounting method are mutually matched, the assembly process of the needle roller at the position of the cross shaft can be very conveniently realized, the lengths of the inner assembly set 15 and the outer assembly set 16 are both set to be smaller than the length of the needle roller 7, the end, opposite to the initial pressure-in end of the needle roller set, of the outer assembly set 16 is ensured to be shorter than the end part of the needle roller 7, the end, opposite to the initial pressure-in end of the cross shaft 2, of the inner assembly set 15 is shorter than the end part of the needle roller 7, by the design, the outer assembly set 16 and the inner assembly set 15 can be conveniently taken out in sequence after the needle roller set 14 and the cross shaft 2 are pressed in, the outer assembly set 16 and the inner assembly set 15 are both designed to be soft kits such as rubber sleeves or plastic sleeves, the preliminary fixing of the middle needle roller 7 position and the protection.

The embodiments given above are preferable examples for implementing the present invention, and the present invention is not limited to the above-described embodiments. Any non-essential addition and replacement made by the technical characteristics of the technical scheme of the invention by a person skilled in the art belong to the protection scope of the invention.