Electric main speed reducer integrated with parking brake and used for axle

Abstract

The invention relates to an integrated parking brake electric main speed reducer for an axle, which comprises an axle housing assembly, a differential mechanism assembly, a brake housing and a brake cylinder, the axle housing assembly is fixedly connected with the main speed reducer housing, a motor is fixedly mounted on the main speed reducer housing, the motor is in transmission connection with a gear pair assembly through a gearbox assembly, and the gear pair assembly is in transmission connection with the differential mechanism assembly. The gear pair assembly penetrates through a motor through a transmission shaft and is in transmission connection with a differential mechanism assembly in the axle housing assembly; the parking brake assembly is fixedly installed on the gearbox assembly, a braking main shaft of the parking brake assembly is connected with the end of a transmission shaft of the gear pair assembly, and the braking main shaft and the transmission shaft of the gear pair assembly are located on the same axis. The motor, the gear pair assembly, the gearbox assembly and the parking brake assembly are integrated on the main speed reducer shell and matched with the transmission shaft penetrating through the gear pair assembly of the annular motor to be directly connected with the braking main shaft, the electric main speed reducer for the axle can be integrated with the parking brake in a small space, and the integration degree of the electric main speed reducer can be effectively improved.

Description

Technical Field

[0001] This invention relates to the field of engineering drive axle technology, specifically an electric main reducer for axles with integrated parking brake. Background Technology

[0002] With the increasing use of pure electric and fuel cell vehicles in the off-highway vehicle market, the scope and fields of new energy off-highway vehicles are constantly expanding, the complexity of the market and operating conditions is constantly increasing, and the requirements for the universality of new energy powertrains under operating conditions are further improved. They must not only meet the energy consumption economy under high-speed and standard load conditions, but also meet the needs of vehicle parking brake.

[0003] Due to structural limitations, current new energy electric main reducers generally do not have parking brake function. Only a small number of new energy electric main reducers have parking brakes. Most of these parking brakes are the common drum or disc central parking brakes. This design of parking brake occupies a lot of space, has a small parking torque, and imposes significant limitations on the matching of the axle assembly. Summary of the Invention

[0004] To address the problems existing in the prior art, the present invention provides an electric main reducer for axles that integrates a parking brake, which allows the parking brake to be integrated into the electric main reducer for axles in a smaller space, thereby effectively improving the integration level of the electric main reducer.

[0005] To achieve the above objectives, the present invention provides an electric main reducer for an axle with integrated parking brake, comprising an axle housing assembly, a differential assembly, a brake housing, and a brake cylinder. The axle housing assembly is fixedly connected to the main reducer housing. A motor is fixedly mounted on the main reducer housing. The motor is driven by a gearbox assembly and connected to a gear pair assembly. The gear pair assembly is driven by a drive shaft passing through the motor and connected to the differential assembly within the axle housing assembly. A parking brake assembly is fixedly mounted on the gearbox assembly. The brake main shaft of the parking brake assembly is connected to the end of the drive shaft of the gear pair assembly. The brake main shaft and the drive shaft of the gear pair assembly are on the same axis.

[0006] In addition, the integrated parking brake axle electric main reducer proposed according to the above embodiments of the present invention may also have the following additional technical features: As a further improvement of the present invention, the parking brake assembly includes a brake spindle, a brake housing, and a brake cylinder. The brake cylinder is disposed inside the brake housing. The brake spindle is mounted on the brake housing via bearings and a retaining ring. The brake flange is connected to the brake spindle via a center spline. The outside of the brake flange is connected to the friction plate assembly via an external spline. A gap is provided between the brake pressure plate and the friction plate assembly. The other end of the brake pressure plate is fixedly connected to the brake cylinder.

[0007] As a further improvement of the present invention, an oil seal is provided between the brake flange and the brake housing.

[0008] As a further improvement of the present invention, the brake main shaft of the parking brake assembly is connected to the end of the transmission shaft of the gear pair assembly via a spline.

[0009] As a further improvement of the present invention, a bearing is provided between the drive shaft of the gear assembly and the motor.

[0010] By means of the above solution, the present invention has at least the following advantages: by integrating the motor, gear pair assembly, gearbox assembly and parking brake assembly on the main reducer housing, and cooperating with the transmission shaft of the gear pair assembly passing through the ring motor to directly connect to the brake main shaft, the parking brake can be integrated into the electric main reducer for the axle with a smaller space, which can effectively improve the integration of the electric main reducer. Attached Figure Description

[0011] Figure 1 This is a three-dimensional schematic diagram of an electric main reducer for a vehicle axle that integrates parking brake; Figure 2 This is a cross-sectional view of an electric main reducer for a vehicle axle that integrates parking brake; Figure 3 This is a structural diagram of a parking brake assembly, which is an integrated parking brake axle electric main reducer. In the diagram: 1. Axle housing assembly, 2. Differential assembly, 3. Main reducer housing, 4. Motor, 5. Gear assembly, 6. Gearbox assembly, 7. Parking brake assembly, 71. Brake spindle, 72. Bearing, 73. Snap ring, 74. Oil seal, 75. Brake flange, 76. Friction pad assembly, 77. Brake pressure plate, 78. Brake housing, 79. Brake cylinder. Detailed Implementation

[0012] The present invention provides an electric main reducer for an axle that integrates parking brake, described below with reference to the accompanying drawings.

[0013] In Embodiment 1 of this application, as Figure 1 and Figure 2As shown, this invention (hereinafter referred to as "the invention") is an electric main reducer for an axle with integrated parking brake. It includes an axle housing assembly 1, a differential assembly 2, a main reducer housing 3, a motor 4, a gear pair assembly 5, and a gearbox assembly 6. The axle housing assembly 1 is fixedly connected to the main reducer housing 3. The motor 4 is fixedly mounted on the main reducer housing 3. The motor 4 is driven to the gear pair assembly 5 through the gearbox assembly 6. The gear pair assembly 5 is driven to the differential assembly 2 inside the axle housing assembly 1 through a drive shaft passing through the motor 4. A parking brake assembly 7 is fixedly mounted on the gearbox assembly 6. The brake main shaft 71 of the parking brake assembly 7 is connected to the end of the drive shaft of the gear pair assembly 5. The brake main shaft 71 and the drive shaft of the gear pair assembly 5 are on the same axis.

[0014] This second embodiment is basically the same in structure as the first embodiment, the difference being that, as Figure 3 As shown, the parking brake assembly 7 includes a brake spindle 71, a brake housing 78, and a brake cylinder 79. The brake cylinder 79 is disposed inside the brake housing 78. The brake spindle 71 is mounted on the brake housing 78 via a bearing 72 and a snap ring 73. The brake flange 75 is connected to the brake spindle 71 via a center spline. The outside of the brake flange 75 is connected to the friction plate assembly 76 via an external spline. A gap is provided between the brake pressure plate 77 and the friction plate assembly 76. The other end of the brake pressure plate 77 is fixedly connected to the brake cylinder 79.

[0015] To further optimize the working efficiency of this application and prevent oil leakage, an oil seal 74 is provided between the brake flange 75 and the brake housing 78. For ease of disassembly and maintenance, the brake spindle 71 of the parking brake assembly 7 is splined to the end of the drive shaft of the gear assembly 5. To ensure more stable rotation of the drive shaft of the gear assembly 5, a bearing is provided between the drive shaft of the gear assembly 5 and the motor 4.

[0016] When in use, an integrated parking brake axle electric main reducer is installed, and the equipment can be put into use.

[0017] When in use, this invention works as follows: The electric main reducer assembly is connected to the vehicle via the axle housing assembly 1. The axle housing assembly 1 serves as the overall support and load-bearing component. When the motor 4 is working, it drives the rotor to rotate and transmits torque to the vehicle through the gearbox assembly 6, gear pair assembly 5, and differential assembly 2, allowing the vehicle to move. When the vehicle stops and requires parking brake, the brake cylinder 79 in the parking brake assembly 7 operates, providing axial force to the brake pressure plate 77. The brake pressure plate 77 presses against the friction pad assembly 76. The friction pad assembly 76 converts the axial force of the brake cylinder into a braking tangential force that rotates around the brake main shaft 71. This force is opposite to the tangential force generated by the vehicle rolling, allowing the vehicle to stop. By increasing or decreasing the number of friction pads, different braking forces can be provided.

[0018] In summary, the electric main reducer for axles with integrated parking brake according to an embodiment of the present invention integrates the motor 4, gear assembly 5, gearbox assembly 6 and parking brake assembly 7 on the main reducer housing 3, and connects the transmission shaft of the gear assembly 5 passing through the ring motor 4 directly to the brake main shaft 71. This allows the parking brake to be integrated into the electric main reducer for axles in a smaller space, which can effectively improve the integration of the electric main reducer.

[0019] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention is limited to these examples; within the framework of the invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity. Any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the invention should be included within the scope of protection of the invention.

Claims

1. An electric main reducer for an axle with integrated parking brake, comprising an axle housing assembly (1), characterized in that, The axle housing assembly (1) is fixedly connected to the main reducer housing (3). The motor (4) is fixedly installed on the main reducer housing (3). The motor (4) is connected to the gear pair assembly (5) through the gearbox assembly (6). The gear pair assembly (5) is connected to the differential assembly (2) inside the axle housing assembly (1) through the drive shaft passing through the motor (4). The parking brake assembly (7) is fixedly installed on the gearbox assembly (6). The brake main shaft (71) of the parking brake assembly (7) is connected to the end of the drive shaft of the gear pair assembly (5). The brake main shaft (71) and the drive shaft of the gear pair assembly (5) are on the same axis.

2. The electric main reducer for an axle with integrated parking brake as described in claim 1, characterized in that, The parking brake assembly (7) includes a brake spindle (71), a bearing (72), a snap ring (73), and an oil seal (74). A brake cylinder (79) is installed inside the brake housing (78). The brake spindle (71) is mounted on the brake housing (78) through the bearing (72) and the snap ring (73). The brake flange (75) is connected to the brake spindle (71) through a center spline. The brake flange (75) is connected to the friction plate assembly (76) through an external spline. A gap is provided between the brake pressure plate (77) and the friction plate assembly (76). The other end of the brake pressure plate (77) is fixedly connected to the brake cylinder (79).

3. The electric main reducer for an axle with integrated parking brake according to claim 2, characterized in that, An oil seal (74) is provided between the brake flange (75) and the brake housing (78).

4. The electric main reducer for an axle with integrated parking brake as described in claim 1, characterized in that, The brake spindle (71) of the parking brake assembly (7) is connected to the end of the drive shaft of the gear pair assembly (5) via a spline.

5. The integrated parking brake axle electric main reducer according to claim 4, characterized in that, A bearing is provided between the drive shaft of the gear assembly (5) and the motor (4).

Images