CN218408397U

CN218408397U - Differential gear

Info

Publication number: CN218408397U
Application number: CN202222653403.9U
Authority: CN
Inventors: 杜生超; 何孟亮; 鲁东; 张晓超; 沈彭
Original assignee: Nanjing Nangaochi New Energy Automobile Transmission Equipment Co ltd
Current assignee: Nanjing Nangaochi New Energy Automobile Transmission Equipment Co ltd
Priority date: 2022-10-08
Filing date: 2022-10-08
Publication date: 2023-01-31
Anticipated expiration: 2032-10-08

Abstract

The application provides a differential mechanism, which relates to the field of vehicle manufacturing and comprises a differential shell and a transmission gear assembly, wherein the differential shell is provided with two assembling inner holes for respectively penetrating two half shafts, the hole wall of at least one of the two assembling inner holes is provided with at least two spiral oil guide grooves, and each spiral oil guide groove is used for guiding lubricating oil in a gearbox into the differential shell; the transmission gear assembly is arranged in the differential shell. The differential shell is provided with an oil guide bulge on the outer end face of the assembling inner hole, and the oil guide bulge is used for blocking lubricating oil and guiding the lubricating oil into the spiral oil guide groove. The structural design of the differential can optimize the lubricating flow field in the differential, improve the lubricating effect on internal parts in the differential operation process, prolong the service life of the differential, and has low failure rate and low operation cost.

Description

Differential gear

Technical Field

The utility model relates to a vehicle manufacturing field particularly, relates to a differential mechanism.

Background

The differential is a main part for realizing differential during turning of the vehicle, and for the electric vehicle, compared with a traditional fuel vehicle, the differential has the characteristics of large instantaneous starting torque, short speed raising time and the like, so that the differential is required to have better lubricating effect besides higher strength and precision; the traditional differential mechanism structure cannot well adapt to the working condition, the problem of insufficient lubrication is easy to occur, and further failure conditions such as abrasion of half-shaft gear gaskets and planetary gear gaskets, grinding burn of a differential mechanism shell and half shafts and the like are caused, so that the lubricating flow field of the differential mechanism needs to be further optimized.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a differential mechanism, it can improve differential mechanism's lubricated flow field to improve the lubricated effect of differential mechanism operation in-process, can prolong differential mechanism's life, reduce the fault rate, reduce the running cost.

The embodiment of the utility model is realized like this:

the utility model provides a differential mechanism, include:

the differential shell is provided with two assembling inner holes for respectively penetrating two half shafts, the hole wall of at least one of the two assembling inner holes is provided with at least two spiral oil guide grooves, and each spiral oil guide groove is used for guiding lubricating oil in the gearbox into the differential shell; the transmission gear assembly is arranged in the differential shell. The differential shell is provided with an oil guide bulge on the outer end face of the assembling inner hole, and the oil guide bulge is used for blocking lubricating oil and guiding the lubricating oil into the spiral oil guide groove.

In an alternative embodiment, at least two spiral oil guide grooves on the hole wall of the same assembly inner hole have the same rotation direction.

In an alternative embodiment, the spiral oil guide grooves on the hole wall of the assembly inner hole are opposite in rotation direction.

In an alternative embodiment, the differential housing is provided with an oil guide protrusion on an outer end surface of the fitting inner hole, and the oil guide protrusion is used for blocking lubricating oil and guiding the lubricating oil into the spiral oil guide groove.

In an alternative embodiment, a starting end of the spiral oil guide groove extends to a side surface of the oil guide protrusion in the circumferential direction of the fitting inner hole.

In an alternative embodiment, an annular oil storage groove is formed in the differential housing and surrounds the assembling inner hole, and the annular oil storage groove is communicated with the spiral oil guide groove and is used for guiding the lubricating oil output from the spiral oil guide groove to the transmission gear assembly.

In an optional implementation manner, a plurality of oil passing grooves which are communicated with the assembly inner hole and the annular oil storage groove simultaneously are further arranged in the differential shell, and the oil passing grooves are arranged at intervals in the circumferential direction of the assembly inner hole.

In an alternative embodiment, the oil grooves are distributed in a spiral radial shape, and the oil grooves are in the same direction as the rotation direction of the differential when the vehicle advances, so that the lubricating oil is guided to the transmission gear assembly through the annular oil storage groove when the vehicle advances.

In an alternative embodiment, the transmission gear assembly includes a pin, two planet gears rotatably connected to the differential case by the pin, and two side gears each located between the two planet gears and respectively engaged with the two planet gears.

In an optional embodiment, a positioning through hole for inserting a pin shaft is formed in the differential shell, and a guide groove is further formed in the differential shell and communicated with the positioning through hole for guiding lubricating oil to the planetary gear.

The embodiment of the utility model provides a beneficial effect is:

in conclusion, the differential mechanism that this embodiment provided utilizes differential shell to assemble it to the gearbox in, and the vehicle operation in-process, the lubricating oil in the gearbox is stirred by differential mechanism, and the lubricating oil of differential mechanism stirring can get into differential shell inside under the guide of two at least spiral oil guide grooves that set up on the pore wall of assembly hole to lubricate the gear drive assembly inside the differential shell. Because the quantity of the spiral oil guide grooves on the hole wall of the assembly inner hole is at least two, the probability that lubricating oil enters the differential shell from the assembly inner hole can be increased, and the amount of the lubricating oil entering the differential shell is increased, so that the transmission gear assembly in the differential shell is better lubricated, the running stability of the differential is improved, the failure rate is reduced, and the running cost is reduced.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic cross-sectional structural view of a differential according to an embodiment of the present invention;

fig. 2 is a schematic view of a view angle of the differential case according to the embodiment of the present invention;

fig. 3 is a schematic structural diagram of another view angle of the differential shell according to the embodiment of the present invention;

fig. 4 is a schematic view of an application of the differential according to the embodiment of the present invention.

Icon:

001-wheel; 002-half shaft; 003-a gearbox; 100-difference shell; 110-fitting the inner bore; 120-spiral oil guide groove; 130-positioning through holes; 140-oil guide projection; 141-oil retaining surface; 150-annular oil reservoir; 160-oil-running groove; 170-a guide groove; 200-a transmission gear assembly; 210-a pin shaft; 220-a planetary gear; 230-side gear; 240-a first shim; 250-second spacer.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without making creative efforts belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined or explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are absolutely horizontal or hanging, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

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, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; 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 meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

It will be appreciated that during operation of the differential, it is necessary to direct lubricating oil within the gearbox 003 into the differential case to lubricate the gear drive components and the like within the differential case. Among the prior art, be provided with the through-hole that supplies half axle 002 to wear to establish on the differential mechanism casing, lubricated lubricating oil generally enters into the differential mechanism casing from through-hole department, the structural design who has the through-hole is single, and differential mechanism casing operation in-process lubricating oil has certain speed, be difficult for entering into the differential mechanism casing from the through-hole, so, lubricated lubricating oil is few in the differential mechanism casing, it is poor to the lubricated effect of inside spare part, easily arouse half axle gear 230 gasket, the wearing and tearing of planetary gear 220 gasket, failure conditions such as differential mechanism casing and half axle 002 grinding burn, thereby shorten differential mechanism's life, the failure rate is improved, the running cost is increased.

In view of this, the designer provides a differential mechanism, can optimize the inside lubricated flow field of differential mechanism, improves the lubricated effect to inside spare part in the differential mechanism operation process, can prolong differential mechanism's life, and the fault rate is low, and the running cost is low.

Referring to fig. 1-3, in the present embodiment, the differential includes a differential case 100 and a transmission gear assembly 200, the differential case 100 has two assembly inner holes 110 for respectively passing through two half shafts 002, at least one of the two assembly inner holes 110 has at least two spiral oil guiding grooves 120 formed on a hole wall, and each spiral oil guiding groove 120 is used for guiding the lubricating oil in the transmission case 003 into the differential case 100; the drive gear assembly 200 is disposed within the differential casing 100.

The differential case 100 may be referred to as a differential case or a differential case. The differential housing 100 is the primary load bearing member for mounting and positioning the drive gear assembly 200 and effecting connection of the differential to the transfer case 003.

In addition, the number and arrangement of the spiral oil guiding grooves 120 in the two assembly bores 110 may be the same, for example, in this embodiment, two spiral oil guiding grooves are provided in each assembly bore 110, that is, a hole wall of each assembly bore 110 is provided with a double spiral oil guiding groove. And, the spiral oil guiding grooves 120 on the hole wall of each fitting bore 110 have the same rotation direction, and the spiral oil guiding grooves 120 on the hole wall of the two fitting bores 110 have opposite rotation directions. In other words, the turning direction of the two spiral oil guiding grooves 120 on the hole wall of one of the two fitting bores 110 is set to a first direction, and the turning direction of the two spiral oil guiding grooves 120 on the hole wall of the other fitting bore 110 is set to a second direction, wherein the first direction and the second direction are opposite.

The lubricating mode in the running process of the differential provided by the embodiment is as follows:

the differential housing 100 is assembled in the transmission case 003, and during the running of the vehicle, the lubricating oil in the transmission case 003 is agitated by the differential, and the differential-agitated lubricating oil can enter the differential housing 100 under the guidance of the two spiral oil guide grooves 120 arranged on the hole wall of the assembly inner hole 110. Because, all be equipped with two spirals on every assembly hole 110's the pore wall and lead oil groove 120, two spirals lead oil groove 120 can be simultaneously with lubricating oil direction in poor shell 100 to lubricated the inside gear drive assembly of poor shell 100. Because the number of the spiral oil guide grooves 120 on the hole wall of each assembly inner hole 110 is two, the probability that lubricating oil enters the differential case 100 from the assembly inner hole 110 can be effectively increased, and the amount of the lubricating oil entering the differential case 100 is increased, so that the transmission gear assembly 200 in the differential case 100 is better lubricated, the running stability of the differential is improved, the failure rate is reduced, and the running cost is reduced.

Referring to fig. 1-3, in the present embodiment, optionally, the differential housing 100 is further provided with two positioning through holes 130, a plurality of oil guiding protrusions 140, two annular oil storage grooves 150, a plurality of oil drainage grooves 160, and a plurality of guiding grooves 170. Wherein, two positioning hole 130 all run through the outer wall setting of poor shell 100 to two positioning hole 130 are the circular port, and the two coaxial setting. The two positioning through holes 130 define an axis perpendicular to the axis defined by the two fitting bores 110. The two positioning through holes 130 are used for inserting pin shafts 210 for positioning the planetary gears 220.

The number of the oil guide protrusions 140 is four, two oil guide protrusions 140 are in one group, two oil guide protrusions 140 in the same group are arranged on the outer end face of the differential case 100 on the assembly inner hole 110, that is, each assembly inner hole 110 has an inner end and an outer end opposite to each other in the axial direction, and two oil guide protrusions 140 are arranged on the corresponding end face of each outer end. The oil guide protrusion 140 is provided with two oil blocking surfaces 141 arranged in the circumferential direction of the assembly inner hole 110, and the starting end of the spiral oil guide groove 120 extends to one of the oil blocking surfaces 141, so that in the differential operation process, lubricating oil in the gearbox 003 is blocked by the oil blocking surface 141 after contacting with the oil blocking surface 141, and the oil blocking surface 141 can directly guide the lubricating oil into the spiral oil guide groove 120, so that the lubricating oil entering the differential case 100 is further increased, and the lubricating effect is improved. It should be noted that, the two oil guide protrusions 140 in the same group are uniformly arranged at intervals in the circumferential direction of the assembly inner hole 110, which is convenient for processing and manufacturing.

Two annular oil reservoirs 150 are respectively corresponding to one ends of the two fitting bores 110 inside the differential case 100, that is, each annular oil reservoir 150 is disposed around one end of the corresponding fitting bore 110 inside the differential case 100, and a space is provided between the paired annular oil reservoirs 150 and the fitting bore 110, thereby providing a space for the plurality of oil-running grooves 160. Specifically, four oil grooves 160 are disposed between the paired annular oil storage groove 150 and the assembly inner bore 110, the four oil grooves 160 are distributed in a spiral radial manner, and the four oil grooves 160 have the same rotating direction as that of the differential when the vehicle is moving forward, so that the lubricating oil is guided to the transmission gear assembly 200 through the annular oil storage groove 150 when the vehicle is moving forward. That is, during operation of the differential, the helical oil guide groove 120 guides the lubricating oil into the differential case 100 and throws the lubricating oil into the annular oil reservoir 150 under the guidance of the four oil drain grooves 160, and the lubricating oil can be temporarily stored in the annular oil reservoir 150, facilitating the flow of the lubricating oil to the position where the transmission gear assembly 200 is located.

The number of the guide grooves 170 is four, two guide grooves 170 are a group, two groups of guide grooves 170 correspond to two positioning through holes 130 respectively, and two guide grooves 170 of each group are located on the inner side of the differential shell 100, one end of each guide groove 170 is communicated with the corresponding positioning through hole 130, and the other end is communicated with the annular oil storage groove 150, so that the lubricating oil discharged from the annular oil storage groove 150 can enter the position of the transmission gear assembly 200 through the guide grooves 170, and the transmission gear assembly 200 is lubricated conveniently.

It should be noted that both the two guide grooves 170 in the same group may be rectangular grooves, and the two guide grooves 170 are arranged in a central symmetry manner, so that the lubricating oil guiding effect is good.

In this embodiment, optionally, the transmission gear assembly 200 includes a pin 210, two planetary gears 220 and two side gears 230, the two planetary gears 220 are rotatably connected to the differential case 100 through the pin 210, the pin 210 is simultaneously inserted into the two positioning through holes 130, and both planetary gears 220 are sleeved outside the pin 210 and inside the differential case 100. The two side gears 230 are each located between the two planetary gears 220, and the two side gears 230 are respectively meshed with the two planetary gears 220. Meanwhile, a first gasket 240 is provided between each of the planet gears 220 and the differential case 100, and covers the notch of the guide groove 170. A second spacer 250 is provided between each side gear 230 and the differential case 100.

The differential provided by the embodiment has the following flow path of lubricating oil during operation:

when the differential operates, the lubricating oil is stirred and enters the two spiral oil guide grooves 120 from the end parts of the two assembling inner holes 110, so that the half shaft 002 and the differential shell 100 can be lubricated, and direct dry grinding between the half shaft 002 and the differential shell 100 is avoided. Under the guidance of the spiral oil guide groove 120, the lubricating oil flows from the oil groove 160 to the annular oil storage groove 150, and when the lubricating oil flows at the oil groove 160, the second gasket 250 between the side gear 230 and the differential case 100 can be lubricated, so that the second gasket 250 is lubricated, and the abrasion of the second gasket 250, the side gear 230 and the differential case 100 is reduced. Meanwhile, the lubricating oil flows from the annular oil reservoir 150 to the guide groove 170, and the lubricating oil is guided to the first gasket 240 through the guide groove 170, lubricating the first gasket 240, and reducing the wear of the first gasket 240, the planetary gear 220, and the differential case 100. Thus, during operation of the differential, lubricating oil can enter the differential case 100, so that the differential case 100 and the parts therein can be effectively lubricated.

In the embodiment, the differential has good lubricating effect and small abrasion of parts in the operation process, the reliability of the parts is improved, and the maintenance cost is reduced.

Referring to fig. 4, in the present embodiment, it should be noted that the differential is assembled into the transmission case 003, the wheels 001 are connected with the side gears 230 through the half shafts 002, specifically, the half shafts 002 are connected with the corresponding side gears 230 through splines after passing through the corresponding assembling inner holes 110. It should be understood that the assembly of the differential, the transmission 003 and the wheels 001 may be by reference to a conventionally known structure and will not be described in detail in this embodiment.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A differential, comprising:

the differential shell is provided with two assembling inner holes for respectively penetrating two half shafts, the hole wall of at least one of the two assembling inner holes is provided with at least two spiral oil guide grooves, and each spiral oil guide groove is used for guiding lubricating oil in the gearbox into the differential shell; the transmission gear assembly is arranged in the differential shell; the differential shell is provided with an oil guide bulge on the outer end face of the assembling inner hole, and the oil guide bulge is used for blocking lubricating oil and guiding the lubricating oil into the spiral oil guide groove.

2. The differential of claim 1, wherein:

and the rotating directions of at least two spiral oil guide grooves on the wall of the same assembling inner hole are the same.

3. The differential of claim 1, wherein:

the spiral oil guide grooves on the hole walls of the two assembling inner holes are opposite in rotation direction.

4. The differential of claim 1, wherein:

the starting end of the spiral oil guide groove extends to the side face of the oil guide bulge in the circumferential direction of the assembling inner hole.

5. The differential of claim 1, wherein:

the differential shell is internally provided with an annular oil storage tank surrounding the assembly inner hole, the annular oil storage tank is communicated with the spiral oil guide groove and used for guiding lubricating oil output by the spiral oil guide groove to the transmission gear assembly.

6. The differential of claim 5, wherein:

the differential shell is internally provided with a plurality of oil grooves which are communicated with the assembly inner hole and the annular oil storage groove at the same time, and the plurality of oil grooves are arranged at intervals in the circumferential direction of the assembly inner hole.

7. The differential of claim 6, wherein:

the oil grooves are distributed in a spiral radial mode, and the rotating directions of the oil grooves and the rotating directions of the differential mechanism when the vehicle moves forward are the same, so that lubricating oil is guided to the transmission gear assembly through the annular oil storage groove when the vehicle moves forward.

8. The differential of claim 1, wherein:

the transmission gear assembly comprises a pin shaft, two planetary gears and two half shaft gears, the two planetary gears are rotatably connected with the differential shell through the pin shaft, and the two half shaft gears are located between the two planetary gears and are respectively meshed with the two planetary gears.

9. The differential of claim 8, wherein:

the differential shell is provided with a positioning through hole for inserting the pin shaft, and a guide groove is further arranged inside the differential shell and communicated with the positioning through hole for guiding lubricating oil to the planetary gear.