CN218882933U

CN218882933U - Automobile differential mechanism

Info

Publication number: CN218882933U
Application number: CN202222928573.3U
Authority: CN
Inventors: 施郁峰
Original assignee: Changzhou Imas Power Technology Co ltd
Current assignee: Changzhou Imas Power Technology Co ltd
Priority date: 2022-11-03
Filing date: 2022-11-03
Publication date: 2023-04-18
Anticipated expiration: 2032-11-03

Abstract

The application discloses differential mechanism, differential mechanism is installed between two semi-axles that have the wheel, the semi-axle has a spline structure, differential mechanism includes a shell, a main reduction gear and a drive assembly, main reduction gear can be driven and drive the shell rotates, drive assembly includes a connecting axle, a plurality of planetary gear and two face gears, the connecting axle with the inner wall of shell is connected, planetary gear by install with can rotating in the connecting axle and can with the revolution takes place for the center for the axis of connecting axle, face gear with the connecting axle is coaxial, two face gears respectively set up in planetary gear's both sides and with planetary gear meshes for 90's form with axial contained angle, face gear can by planetary gear drives and rotates, face gear has an assembly structure, face gear passes through assembly structure with spline structure's mating reaction drives semi-axle synchronous motion.

Description

Automobile differential mechanism

Technical Field

The utility model relates to the technical field of auto-parts, especially, relate to automobile differential.

Background

When the automobile runs on a curve, the motion radius of the inner side wheel is smaller than that of the outer side wheel, and the rotating speed of the outer side wheel is required to be higher than that of the inner side wheel. To meet this requirement, a differential is usually installed between the two wheels, so as to adjust the difference between the rotational speeds of the two wheels by using the differential.

The existing differential mechanism mostly utilizes a planetary gear set consisting of a bevel gear pair to realize a differential function, wherein the bevel gear pair comprises a planetary bevel gear and a half-shaft bevel gear connected with wheels through a half shaft, the half-shaft bevel gear and the planetary bevel gear are generally assembled in a mode that vertex of the cone coincides and an axis included angle between the two is 90 degrees, in order to control meshing spots between the half-shaft bevel gear and the planetary bevel gear, a proper gasket is generally required to be selected to adjust the meshing gap between the half-shaft bevel gear and the planetary bevel gear, if the meshing gap between the half-shaft bevel gear and the planetary bevel gear is too large, the meshing spots are too small at the moment, the situation that teeth collide and are damaged easily occurs during operation, and if the meshing gap between the half-shaft bevel gear and the planetary bevel gear is too large at the moment, the situation that the teeth are stuck easily occurs during operation. Therefore, the integral assembly requirement is high, so that the NVH control of the differential is difficult, multiple times of debugging may be needed in the actual operation process, and the operation is complex. Meanwhile, because the back surface of the bevel gear of the planetary bevel gear is a spherical surface, and the spherical surface is a matching surface, the matching surface is required to have high requirements on shape and position precision, and the manufacturing difficulty is higher than that of a plane.

In addition, the differential needs to have a large enough assembly space to meet the actual assembly requirements, but this makes the axial dimension of the differential too large, and then needs to occupy a large space inside the automobile, which increases the difficulty in assembling other parts inside the automobile.

SUMMERY OF THE UTILITY MODEL

The utility model discloses an advantage lies in providing automobile differential mechanism, the utility model discloses utilize the planetary gear set that face gear structure constitutes in order to realize the differential function, compare the planetary gear set of current bevel gear pair self-constitution, the assembly requirement is low, and the installation clearance is less to the meshing spot influence, makes automobile differential mechanism's NVH is controlled more easily to the part machining degree of difficulty is low, and whole required axial space is little.

The utility model discloses an advantage lies in providing automobile differential mechanism, the utility model discloses can utilize face gear's structural advantage, through designing a plurality of planetary gear with the increase differential ability to can set up the planetary gear of different quantity according to face gear's actual size.

The utility model discloses an advantage provides automobile differential mechanism, the utility model discloses utilize the gasket, reduce the friction between inside spare part and the casing, prolong automobile differential mechanism's life.

In order to achieve the utility model discloses above at least one advantage, the utility model provides an automobile differential mechanism, automobile differential mechanism is installed between two semi-axles that have the wheel, the semi-axle has a spline structure, automobile differential mechanism includes:

a housing having a mounting cavity;

the main reducing gear is arranged on the outer surface of the shell and is coaxial with the shell, and the main reducing gear can be driven to drive the shell to rotate;

a drive assembly, drive assembly be installed in the installation cavity, drive assembly includes a connecting axle, a plurality of planetary gear and two face gears, the connecting axle with the inner wall connection of shell and can with the shell is together rotated, but planetary gear install with autorotation in the connecting axle, just planetary gear is set up can with the axis of connecting axle takes place the revolution as the center, face gear with the coaxial setting of connecting axle, two face gears set up respectively in planetary gear's both sides and with planetary gear meshes for 90 form with the axial contained angle, face gear can by planetary gear drives and rotates, face gear has an assembly structure, assembly structure's size adaptation in the semi-axis spline structure, face gear passes through assembly structure with spline structure's mating reaction drives semi-axis synchronous motion.

According to the utility model discloses an embodiment, automobile differential still includes a plurality of connection structure, the shell includes a first casing and a second casing, first casing passes through connection structure by detachably connect in the second casing, first casing with the second casing forms the installation cavity.

According to an embodiment of the present invention, the connecting structure includes a bolt and at least one mounting hole, the mounting hole is adapted to the bolt, and the mounting hole is formed in the first housing and/or the second housing.

According to the utility model discloses a bolt is rotationally connected in first casing, the mounting hole is provided with one, the mounting hole form in the second casing, the bolt through peg graft in the mounting hole with first casing with the second casing bolt.

According to the utility model discloses an embodiment, it is a plurality of planetary gear with the axis of connecting axle presents the array distribution as the reference, just planetary gear's the quantity that sets up can be according to face gear's actual size designs.

According to the utility model discloses an embodiment, automobile differential still includes a gasket subassembly, the gasket subassembly be installed in drive assembly just is located drive assembly with between the inner wall of shell, the gasket subassembly is used for alleviateing when drive assembly rotates with friction between the shell.

According to the utility model discloses an embodiment, the gasket subassembly includes a plurality of first gaskets, the quantity that sets up of first gasket with planetary gear's the quantity that sets up keeps unanimous, first gasket is located planetary gear is close to one side of shell inner wall.

According to the utility model discloses an embodiment, the gasket subassembly still includes two second gaskets, two the second gasket is all installed in two the face gear is kept away from planetary gear's one end, just the second gasket is located the face gear with between the shell inner wall.

According to the utility model discloses an embodiment, automobile differential still includes an at least bearing, the bearing be installed in the shell, the bearing is used for supporting the shell.

According to the utility model discloses an embodiment, the bearing is provided with two, two the bearing is interference connection respectively in first casing with the one end that the second casing kept away from each other, two the bearing supports jointly the shell.

Drawings

Fig. 1 shows a schematic structural diagram of the automobile differential mechanism of the present invention.

Fig. 2 shows a structural cross-sectional view of the automobile differential of the present invention.

Fig. 3 shows a perspective view of a partial structure of the differential mechanism of the present invention.

Fig. 4 shows an explosion diagram of the structure of the automobile differential mechanism of the present invention.

Detailed Description

The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art. The basic principles of the invention, as defined in the following description, may be applied to other embodiments, variations, modifications, equivalents and other technical solutions without departing from the spirit and scope of the invention.

It will be understood by those skilled in the art that in the present disclosure, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in a generic and descriptive sense only and not for purposes of limitation, as the terms are used in the description to indicate that the referenced device or element must have the specified orientation, be constructed and operated in the specified orientation, and not for the purpose of limitation.

It is understood that the terms "a" and "an" should be interpreted as meaning that a number of one element or element is one in one embodiment, while a number of other elements is one in another embodiment, and the terms "a" and "an" should not be interpreted as limiting the number.

Referring to fig. 1 to 4, a differential gear according to a preferred embodiment of the present invention will be described in detail below, wherein the differential gear is installed between two half shafts with wheels, and the differential gear can be driven to drive two half shafts to rotate, so as to drive two wheels to rotate. The half shaft has a spline structure.

Preferably, the spline structure is implemented as an internal spline or an external spline.

The automobile differential comprises a shell 10, and the shell 10 is provided with a mounting cavity 101.

Further, the automobile differential further includes a plurality of connecting structures 20, the outer case 10 includes a first case 11 and a second case 12, the first case 11 is detachably connected to the second case 12 through the connecting structures 20, and the first case 11 and the second case 12 form the mounting cavity 101. The first housing 11 and the second housing 12 are detachably connected to each other, so that maintenance can be performed on the components in the installation cavity 101.

Further, the connecting structure 20 includes a bolt 21 and at least one mounting hole 22, the mounting hole 22 is adapted to the bolt 21, and the mounting hole 22 is formed in the first casing 11 and/or the second casing 12.

Preferably, the bolt 21 is rotatably connected to the first housing 11, the mounting hole 22 is provided with one, the mounting hole 22 is formed in the second housing 12, and the bolt 21 is inserted into the mounting hole 22 to bolt the first housing 11 and the second housing 12.

The mounting holes 22 are two in number, and the two mounting holes 22 are formed in the first housing 11 and the second housing 12, respectively, and the bolts 21 are inserted into the two mounting holes 22 to bolt the first housing 11 and the second housing 12.

It will be understood by those skilled in the art that the bolt 21 is rotatably connected to the second housing 12, one mounting hole 22 is provided, and the mounting hole 22 is formed in the first housing 11, which can also achieve the purpose of bolting the first housing 11 and the second housing 12, and will not be described herein again.

Further, the automobile differential further includes a main reduction gear 30, the main reduction gear 30 is mounted on the outer surface of the housing 10 and is disposed coaxially with the housing 10, and the main reduction gear 30 can be driven to rotate the housing 10.

Preferably, the main reduction gear 30 is welded to the second housing 12.

It will be appreciated by those skilled in the art that the main reduction gear 30 may be formed integrally with the second housing 12 or may be attached by other means, such as bolting.

Referring to fig. 2 to 3, the automobile differential further includes a transmission assembly 40, the transmission assembly 40 is mounted in the mounting cavity 101, and the transmission assembly 40 is used for driving the half shafts to rotate.

The transmission assembly 40 includes a connection shaft 41 and a plurality of planetary gears 42, the connection shaft 41 is connected to the inner wall of the housing 10, and the connection shaft 41 can rotate together with the housing 10. The planetary gear 42 is rotatably attached to the connecting shaft 41, and the planetary gear 42 is provided to be capable of revolving around the axis of the connecting shaft 41.

Preferably, the planetary gears 42 are implemented as involute spur gears.

Further, transmission assembly 40 still includes face gear 43, face gear 43 with connecting shaft 41 coaxial setting, two face gear 43 is set up respectively in planetary gear 42's both sides and with planetary gear 42 uses the axis contained angle to mesh for 90, compares current planetary gear set of constituteing by the bevel gear pair, and the assembly requirement is low, and the installation clearance is less to the meshing spot influence, makes automobile differential's NVH controls more easily to the part machining degree of difficulty is low, and whole required axial space is little.

The face gear 43 has a fitting structure 431, the fitting structure 431 is sized to fit the spline structure of the axle shaft, and the face gear 43 drives the axle shaft to move synchronously through the cooperation of the fitting structure 431 and the spline structure.

Preferably, when the spline structure is implemented as an external spline, the fitting structure 431 is implemented as an internal spline, and the face gear 43 is sleeved on the axle shaft through the matching action of the internal spline and the external spline.

As a variant, when the spline structure is implemented as an internal spline, the fitting structure 431 is implemented as an external spline, and the face gear 43 is engaged with the axle shaft by the cooperation of the internal spline and the external spline.

When the planetary gear 42 is driven by the connecting shaft 41 to rotate and the resistance of the wheels on the half shafts connected with the two face gears 43 is the same, the two face gears 43 and the planetary gear 42 keep relatively static, and at this time, the two face gears 43 are driven by the planetary gear 42 to rotate, so as to drive the two half shafts to rotate at the same speed, so that the two wheels rotate at the same speed.

When the planetary gear 42 is driven by the connecting shaft 41 to rotate and the resistance applied to the wheels on the half shafts connected to the two face gears 43 is different, the half shaft on the side with the larger resistance transmits the resistance to the face gear 43 connected to the half shaft to increase the difficulty of the planetary gear 42 driving the face gear 43 to rotate, so that the rotation speed of the face gear 43 is reduced, and the wheels on the half shaft on the side with the larger resistance are driven to rotate in a decelerating manner. Meanwhile, the planet gear 42 rotates, and the planet gear 42 transmits more torque to the other face gear 43 connected to the half shaft on the less-blocked side, so that the other face gear 43 can be subjected to the revolving force and the rotating force of the planet gear 42 to increase the speed, and further, the wheels on the half shaft on the less-blocked side are driven to increase the speed, so that the two wheels rotate at different speeds.

It should be noted that the plurality of planet gears 42 are distributed in an array with reference to the axis of the connecting shaft 41, so that the plurality of planet gears 42 can uniformly transmit torque to the face gear 43, thereby increasing the stability and smoothness of the rotation of the face gear 43 and improving the differential capability.

It is worth mentioning that the number of the planetary gears 42 can be designed according to the actual size of the face gear 43, so as to improve the carrying capacity of the automobile differential.

Referring to fig. 3 to 4, the differential mechanism of the automobile further includes a shim assembly 50, the shim assembly 50 is mounted to the transmission assembly 40 and located between the transmission assembly 40 and the inner wall of the housing 10, and the shim assembly 50 is used for reducing friction between the transmission assembly 40 and the housing 10 when rotating, so as to prevent the transmission assembly 40 and the inner wall of the housing 10 from being worn due to direct contact, which affects service life.

The gasket assembly 50 includes a plurality of first gaskets 51, the number of the first gaskets 51 is consistent with the number of the planet gears 42, the first gaskets 51 are located on one side of the planet gears 42 close to the inner wall of the housing 10, and the first gaskets 51 prevent the planet gears 42 from directly contacting the inner wall of the housing 10 to prevent the planet gears 42 from rubbing and damaging the inner wall of the housing 10 when rotating.

The gasket assembly 50 further includes two second gaskets 52, two second gaskets 52 are respectively installed at one end of the two face gears 43 far away from the planetary gear 42, and the second gasket 52 is located between the face gears 43 and the inner wall of the housing 10, the second gasket 52 prevents the face gears 43 from directly contacting the inner wall of the housing 10, so as to prevent the face gears 43 from rubbing against the inner wall of the housing 10 and being damaged when rotating.

Referring to fig. 1, 2 and 4, the automobile differential further includes at least one bearing 60, the bearing 60 being mounted to the housing 10, the bearing 60 being used to support the housing 10.

Preferably, two bearings 60 are provided, two bearings 60 are respectively connected to the ends of the first housing 11 and the second housing 12 away from each other in an interference manner, and the two bearings 60 jointly support the housing 10 in a stable manner.

The bearing 60 is provided with one bearing 60 as a deformable body, and the bearing 60 is located at the middle of the housing 10 so that the bearing 60 can stably support the housing 10.

The working principle of the automobile differential mechanism comprises the following steps:

the main reduction gear 30 is driven to drive the shell 10 to rotate, the shell 10 drives the planet gear 42 to rotate through the connecting shaft 41, and the planet gear 42 drives the face gear 43 to rotate at the same speed when the resistance of the wheels on the half shaft connected with the two face gears 43 is the same, so that the two wheels rotate at the same speed; when the resistance to the wheels on the half shafts connected to the two face gears 43 is different, the planet gear 42 drives the face gear 43 on the side with smaller resistance to rotate at an increased speed and the face gear 43 on the side with larger resistance to rotate at a decreased speed.

It will be understood by those skilled in the art that the embodiments of the present invention as described above and shown in the drawings are given by way of example only and are not limiting of the present invention. The advantages of the present invention are complete and effective. The functional and structural principles of the present invention have been shown and described in the embodiments without departing from the principles, embodiments of the present invention may have any deformation or modification.

Claims

1. Automotive differential, automotive differential is installed between two semi-axles that have the wheel, the semi-axle has a spline structure, its characterized in that, automotive differential includes:

a housing having a mounting cavity;

2. The automotive differential of claim 1, further comprising a plurality of connecting structures, wherein the housing includes a first housing and a second housing, the first housing being removably coupled to the second housing by the connecting structures, the first housing and the second housing defining the mounting cavity.

3. The automotive differential of claim 2, wherein the connecting structure includes a bolt and at least one mounting hole, the mounting hole being adapted to the bolt, the mounting hole being formed in the first housing and/or the second housing.

4. The automotive differential of claim 3, wherein the bolt is rotatably coupled to the first housing, the mounting hole is provided with one, the mounting hole is formed in the second housing, and the bolt is inserted into the mounting hole to bolt the first housing to the second housing.

5. The automobile differential according to claim 1, characterized in that a plurality of the planetary gears are arranged in an array with reference to an axis of the connecting shaft, and the number of the planetary gears is designed according to the actual size of the face gear.

6. The automotive differential of claim 1, further comprising a shim pack mounted to the drive assembly between the drive assembly and the inner wall of the housing, the shim pack for reducing friction between the drive assembly and the housing during rotation of the drive assembly.

7. The automotive differential of claim 6, wherein the shim pack includes a plurality of first shims, the number of first shims corresponding to the number of planet gears disposed, the first shims located on a side of the planet gears adjacent the inner wall of the housing.

8. The automotive differential of claim 7, wherein the shim pack further includes two second shims, each of the two second shims being mounted to an end of each of the face gears remote from the planet gears, and the second shims being located between the face gears and the inner wall of the housing.

9. The automotive differential of claim 2, further comprising at least one bearing mounted to the housing, the bearing adapted to support the housing.

10. The automotive differential of claim 9, characterized in that two of the bearings are provided, and the two bearings are respectively connected to the ends of the first housing and the second housing away from each other in an interference manner, and the two bearings jointly support the outer casing.