CN217422087U

CN217422087U - Differential assembly, vehicle drive assembly and vehicle

Info

Publication number: CN217422087U
Application number: CN202221253904.1U
Authority: CN
Inventors: 张伟; 芮鹏; 王永平
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 2022-05-24
Filing date: 2022-05-24
Publication date: 2022-09-13
Anticipated expiration: 2032-05-24
Also published as: WO2023227334A1

Abstract

The application provides a differential assembly, a vehicle drive assembly and a vehicle. The differential assembly includes: a differential mechanism; a first half shaft and a second half shaft connected with the differential; a torque increasing gear set comprising: a first gear assembly concentrically disposed about said first axle shaft and axially disposed on a side of said differential adjacent said first axle shaft, and a second gear assembly drivingly engaged with said first gear assembly and said external gear of said differential, respectively; and a support fixedly disposed between the first gear assembly and the differential, and including a first bearing housing in which a first bearing for supporting one end of a hollow shaft of the first gear assembly is accommodated and a second bearing housing in which a second bearing for supporting one end of a rotating shaft of the differential is accommodated. According to the utility model discloses an embodiment provides compact structure, the stable differential mechanism subassembly and the vehicle drive assembly of operation.

Description

Differential assembly, vehicle drive assembly and vehicle

Technical Field

The utility model relates to a vehicle spare part field, more specifically, the utility model relates to a differential mechanism subassembly, vehicle drive assembly and vehicle.

Background

In vehicles, motorization has become a trend. For heavy vehicles with large power demands, it is one of the challenges how to arrange the drive mechanism in a compact space to achieve a larger gear ratio to increase the output torque of the power motor. One way of conceiving is to arrange a torque increasing gear set on the outer ring of the half shaft by using the space on one side of the differential. In order to maintain the coaxiality of the torque-increasing gear set and the differential and because of the different rotational speeds of the two, it is common to provide a needle bearing between the two. However, the needle roller bearing may fail in long-term use due to the large speed difference and torque difference between the two.

SUMMERY OF THE UTILITY MODEL

It is an object of the present application to solve or at least mitigate the problems of the prior art.

According to one aspect, there is provided a differential assembly comprising:

a differential mechanism;

a first half shaft and a second half shaft connected with the differential;

a torque increasing gear set comprising: a first gear assembly concentrically disposed about said first axle shaft and axially disposed on a side of said differential adjacent said first axle shaft, and a second gear assembly drivingly engaged with said first gear assembly and said external gear of said differential, respectively; and

a support fixedly disposed between the first gear assembly and the differential, and including a first bearing housing in which a first bearing for supporting one end of a hollow shaft of the first gear assembly is received and a second bearing housing in which a second bearing for supporting one end of a rotating shaft of the differential is received.

Optionally, in an embodiment of the differential assembly, the support includes a cylindrical body and a support arm extending radially outward from the body.

Optionally, in an embodiment of the differential assembly, the support arm is configured to be connected to a housing of the differential assembly avoiding connection of other components of the differential assembly, the outer end of the support arm being provided with bolt holes for fixing the support.

Optionally, in an embodiment of the differential assembly, the first bearing seat and the second bearing seat are located at opposite end faces of the main body.

Optionally, in an embodiment of the differential assembly, the first gear assembly comprises a hollow shaft concentrically fitted over the first axle and a first gear on the hollow shaft and a second gear having a smaller outer diameter than the first gear.

Optionally, in an embodiment of the differential assembly, the second gear assembly comprises a first gear shaft and a second gear shaft, the rotational axes of the first gear shaft and the second gear shaft being parallel to the rotational axis of the hollow shaft, a third gear meshing with the second gear of the first gear assembly and a fourth gear meshing with the external gear of the differential being provided on the first gear shaft and the second gear shaft, respectively, the fourth gear having an outer diameter smaller than the third gear.

According to another aspect, a vehicle drive assembly is provided, including a power motor;

the transmission is connected with the power motor; and

a differential assembly according to various embodiments connected with the transmission, wherein the first gear set receives torque from the transmission.

Optionally, in the vehicle drive assembly, the power motor, the transmission and the differential assembly are integrated in the same housing.

Optionally, in the vehicle drive assembly, the power motor and the transmission are located at opposite sides of the differential from the second gear assembly in the longitudinal direction.

According to another aspect, there is provided a vehicle comprising: comprising a differential assembly according to various embodiments or a vehicle drive assembly according to various embodiments.

According to the utility model discloses an embodiment provides compact structure, operation stability and can realize differential mechanism subassembly and vehicle drive assembly that big moment of torsion increases.

Drawings

The disclosure of the present application will become more readily understood with reference to the drawings. As is readily understood by those skilled in the art: these drawings are for illustrative purposes only and are not intended to constitute a limitation on the scope of the present application. Moreover, in the drawings, like numerals are used to indicate like parts, and in which:

FIG. 1 shows a schematic view of a vehicle drive assembly according to an embodiment of the present invention;

FIG. 2 illustrates a partial schematic view of a differential assembly according to an embodiment of the present invention; and

fig. 3 illustrates a perspective view of a support member of a differential assembly according to an embodiment of the present invention.

Detailed Description

A differential assembly and a vehicle drive assembly according to an embodiment of the present invention will be described with reference to fig. 1 to 3. First, fig. 1 shows an overall layout of a vehicle drive assembly according to an embodiment, which may be provided as a single product to an entire vehicle manufacturer or a differential assembly therein may be provided separately as a product to an entire vehicle manufacturer. The vehicle drive assembly comprises a power motor 1; a transmission 3 connected with the power motor 1 by means of an intermediate gear 2 and a differential assembly according to an embodiment of the invention. In the illustrated embodiment, the transmission 3 is a four-speed transmission. The differential assembly includes a differential 6; a first half-shaft 71 and a second half-shaft 72 connected to the differential 6, the first half-shaft 71 and the second half-shaft 72 being respectively for connection to wheels; and a torque increasing gear set including: a first gear assembly 4 concentrically fitted over the outside of the first axle shaft 71 and axially on the side of the differential 6 close to said first axle shaft, and a second gear assembly 5 in driving engagement with the first gear assembly 4 and with the differential 61, respectively. In the above structure, the first gear assembly 4 rotates coaxially with the differential gear 6, but there is a large difference in rotation speed and torque, and therefore the present invention further provides the support member 8, the support member 8 is fixedly disposed between the first gear assembly 4 and the differential gear 6, and the support member 8 includes the first bearing housing 801 (fig. 3) and the second bearing housing 802, the first bearing 81 supporting one end of the hollow shaft 41 of the first gear assembly is accommodated in the first bearing housing 801, and the second bearing 82 supporting one end of the rotating shaft of the differential gear is accommodated in the second bearing housing 802, thereby providing bearing support for the first gear assembly 4 and the differential gear 6, so that the first gear assembly 4 and the differential gear 6 having different rotation speeds and torques stably operate.

In some embodiments, the first gear assembly 4 includes a hollow shaft 41 concentrically fitted over the first half shaft 71, a first gear 42 on the hollow shaft 41, and a second gear 43 having an outer diameter smaller than that of the first gear 42, the first gear 42 is engaged with the transmission case 3 to receive the input torque, and the second gear 43 is engaged with the second gear assembly 5.

The second gear set 5 may be any structure that transfers the torque of the first gear assembly 4 to the differential 6, which may include, for example, a single shaft and pinion thereon to engage the second gear 43 and the external gear 61 of the differential, respectively, to effect torque transfer and torque multiplication. In some embodiments, in order to achieve a stable large torque transfer, as shown in fig. 2, the second gear assembly comprises a double-shaft structure including a first gear shaft 501 and a second gear shaft 502, the rotational axes of the first gear shaft 501 and the second gear shaft 502 being parallel to the rotational axis of the hollow shaft 41, i.e., parallel to the rotational axes of the differential 6 and the first half-shaft 71, the second half-shaft 72. The first gear shaft 501 and the second gear shaft 502 are respectively provided with a third gear 51 engaged with the second gear 43 of the first gear assembly and a fourth gear 52 having an outer diameter smaller than that of the third gear 51 engaged with the outer gear 61 of the differential, thereby achieving stable torque transmission and torque increase. In an alternative embodiment, the second gear assembly may include multiple stages to achieve torque multiplication for a larger gear ratio.

With continued reference to fig. 3, the support 8 includes a cylindrical body 800 and a plurality of support arms 803 extending radially outward from the body 800. The plurality of support arms 803 are used for a fixed mounting of the support member 8, and thus the plurality of support arms 803 may be designed to avoid attachment of other structures of the differential assembly to the housing of the differential assembly. In some embodiments, the ends of the plurality of support arms 803 have mounting holes 805 to fixedly mount to any housing of the differential assembly. The cylindrical body 800 of the support 8 defines inside it a first bearing seat 801 and a second bearing seat 802, in some embodiments the first bearing seat 801 and said second bearing seat 802 being located at opposite end faces of the body 800.

In some embodiments, the power motor 1 and the transmission 3 are located on opposite sides of the first gear set 4 and the differential 6 from the second gear set 5 in the longitudinal direction, i.e., the front-rear direction (the traveling direction) of the vehicle, for example, the power motor 1 and the transmission 3 are located on the rear side and the second gear set 5 is located on the front side, and the first gear set 4 and the differential 6 are adjacent in the axial direction, i.e., the wheel axial direction, thereby achieving torque increase in a compact structure. Although in the illustrated embodiment the power motor 1, the transmission 3 and the differential assembly are integrated in the same housing and supplied together to the vehicle manufacturer, alternatively the differential assembly according to the embodiment may be supplied as a separate module, and the transmission and the drive means may be replaced, for example other types of transmissions and other power sources may be used, the power source not being limited to a drive motor.

According to the utility model discloses an embodiment provides compact structure, operation stability and can realize differential mechanism subassembly and vehicle drive assembly that big moment of torsion increases, and it is particularly useful for electric drive's heavy vehicle.

The foregoing description of the specific embodiments of the present application has been presented only to provide a clearer description of the principles of the application, wherein various components are clearly illustrated or described to facilitate a better understanding of the principles of the invention. Various modifications or changes may be readily made to the present disclosure by those skilled in the art without departing from the scope thereof. It is to be understood that such modifications and variations are intended to be included within the scope of the present application.

Claims

1. A differential assembly, comprising:

a differential (6);

a first half-shaft (71) and a second half-shaft (72) connected to the differential (6);

a torque increasing gear set comprising: a first gear assembly (4) concentrically fitted over the outside of the first half-shaft (71) and axially on the side of the differential (6) close to the first half-shaft (71), and a second gear assembly (5) in driving engagement with the first gear assembly (4) and with the external gear (61) of the differential, respectively; and

a support (8) fixedly arranged between the first gear assembly (4) and the differential (6), and the support (8) comprises a first bearing seat (801) and a second bearing seat (802), the first bearing seat (801) accommodating therein a first bearing (81) for supporting one end of a hollow shaft (41) of the first gear assembly (4), and the second bearing seat (802) accommodating therein a second bearing (82) for supporting one end of a rotating shaft of the differential (6).

2. The differential assembly of claim 1, wherein the support comprises a cylindrical body (800) and a support arm (803) extending radially outward from the body.

3. A differential assembly according to claim 2, characterized in that the support arm (803) is configured to be connected to a housing of the differential assembly, avoiding connection of other components of the differential assembly, the outer end of the support arm (803) being provided with bolt holes (805) for fixing the support.

4. The differential assembly of claim 2, characterized in that the first bearing seat (801) and the second bearing seat (802) are located at opposite end faces of the main body (800).

5. A differential assembly according to any one of claims 1 to 4, characterised in that the first gear assembly (4) comprises a hollow shaft (41) concentrically fitted over the first half-shaft (71) and a first gear wheel (42) on the hollow shaft and a second gear wheel (43) of smaller external diameter than the first gear wheel.

6. A differential assembly according to claim 5, characterized in that the second gear assembly (5) comprises a first gear shaft (501) and a second gear shaft (502), the axes of rotation of the first gear shaft (501) and the second gear shaft (502) being parallel to the axis of rotation of the hollow shaft (41), a third gear (51) meshing with the second gear (43) of the first gear assembly and a fourth gear (52) meshing with the external gear (61) of the differential being provided on the first gear shaft (501) and the second gear shaft (502), respectively, the fourth gear (52) having an external diameter smaller than the third gear (51).

7. A vehicle drive assembly, characterized in that the vehicle drive assembly comprises:

a power motor (1);

the transmission (3) is connected with the power motor (1); and

the differential assembly according to any one of claims 1-6 connected to the transmission, wherein the first gear assembly (4) receives torque from the transmission (3).

8. Vehicle drive assembly according to claim 7, characterised in that the power motor (1) and the transmission (3) are located at opposite sides of the differential (6) in the longitudinal direction from the second gear assembly (5).

9. Vehicle drive assembly according to claim 7 or 8, characterised in that the power motor (1), the transmission (3) and the differential assembly are integrated in the same housing.

10. A vehicle comprising the differential assembly of any one of claims 1-6 or the vehicle drive assembly of any one of claims 7-9.