A fixed hydraulic brake for a hub drive unit assembly

Abstract

This invention relates to a fixed hydraulic brake for a wheel hub drive unit assembly, mounted on the assembly. It includes a brake disc, four calipers, and brake lines. The brake disc is connected to the rotating end of the wheel hub drive unit assembly. Each of the four calipers includes a housing and a piston. The four housings are fixedly connected to the motor housing of the wheel hub drive unit. Each housing has multiple braking chambers. One end of the piston is embedded in a braking chamber, and the other end extends outside the chamber and abuts against the brake disc. The piston slides within the braking chamber of the housing and forms a sealed connection with the chamber through a sealing ring installed in the chamber's annular groove. The four housings are evenly arranged circumferentially around the brake disc. The oil supply end of the brake lines is connected to the four braking chambers to drive the pistons to slide to abut against the brake disc or to be spaced apart. This invention solves the problem of poor braking capacity in existing hydraulic calipers.

Description

Technical Field

[0001] This invention relates to the field of vehicle technology, and more particularly to a fixed hydraulic brake for a wheel hub drive unit assembly. Background Technology

[0002] Currently, most automotive braking systems utilize hydraulic calipers, which are further categorized into floating and fixed types. However, these hydraulic calipers all exhibit certain drawbacks when applied to the drive wheel assemblies of hub motors.

[0003] The caliper inlet pipe in existing floating hydraulic calipers must use a flexible rubber hose, and the rubber hose must be in a free and relaxed state. As a result, a sufficiently large gap needs to be reserved between the motor housing and the rim to ensure the safe operation of the rubber hose. However, increasing the gap between the motor housing and the rim can only reduce the outer diameter of the drive motor, which will severely reduce the motor power.

[0004] Existing fixed hydraulic calipers use one or two calipers, resulting in poor braking ability and uneven force distribution on the brake disc. Summary of the Invention

[0005] In view of this, it is necessary to provide a fixed hydraulic brake for a hub drive unit assembly to solve the problem of poor braking capacity of existing hydraulic calipers.

[0006] This invention provides a fixed hydraulic brake for a wheel hub drive unit assembly, mounted on the assembly, comprising a brake disc, four calipers, and brake lines. The brake disc is connected to the rotating end of the wheel hub drive unit assembly. Each of the four calipers includes a housing and a piston. The four housings are fixedly connected to the motor housing of the wheel hub drive unit assembly. Each housing has multiple brake chambers. One end of the piston is housed within a brake chamber, and the other end extends outside the brake chamber and abuts against the brake disc. The piston slides within the brake chamber of the housing and forms a sealed connection with the brake chamber through a sealing ring installed in an annular groove within the brake chamber. The four housings are evenly arranged circumferentially around the brake disc. The oil supply end of the brake lines communicates with the brake chambers machined on the four housings, driving the piston to slide to abut against the brake disc or be spaced apart.

[0007] Furthermore, a mounting hole is provided on the side of the housing away from the brake disc, and a fixing screw is provided in the mounting hole. The fixing screw is threadedly connected to a threaded hole on the wheel hub drive unit assembly.

[0008] Furthermore, the piston is cylindrical, and a sealing ring is provided on the outer wall of the piston. The sealing ring is installed in an annular groove opened in the braking chamber and forms a sealed connection with the outer circle of the piston and the braking chamber.

[0009] Furthermore, each caliper contains multiple pistons, which are arranged sequentially along the circumference of the brake disc.

[0010] Furthermore, the brake line includes two connecting lines and an oil supply line, wherein the brake chambers of the two calipers are connected via one connecting line, and the brake chambers of the other two calipers are connected via another connecting line, and the oil supply line is connected to both connecting lines respectively.

[0011] Furthermore, each of the outer casings is provided with an oil inlet and an oil outlet that communicate with the brake chamber. The oil inlets of two of the outer casings are respectively connected to two of the connecting pipes. The oil outlets of two of the outer casings are each equipped with a vent screw. The oil outlets of the other two outer casings are respectively connected to two of the connecting pipes. The oil inlets of the other two outer casings are each connected to an oil supply pipe.

[0012] Furthermore, the oil supply pipeline includes an oil inlet pipe, a tee connector, a branch pipe, and an oil inlet connector. One end of the oil inlet pipe is connected to the tee connector, the tee connector is connected to the oil inlet of one of the housings, the tee connector is connected to the oil inlet connector via the branch pipe, and the oil inlet connector is connected to the oil inlet of the other housing.

[0013] Furthermore, the oil inlet pipe is connected to an external hydraulic power source via a main connector, which is detachably connected to the wheel hub drive unit assembly.

[0014] Furthermore, both connecting pipes and the oil delivery pipe are rigid pipes.

[0015] Furthermore, a gap is formed between two adjacent outer shells.

[0016] Compared with existing technologies, this invention connects the brake disc to the rotating end of the wheel hub drive unit assembly, allowing the brake disc to rotate synchronously with the rotating end of the wheel hub drive unit assembly. Four calipers, each including a housing and a piston, are fixedly connected to the motor housing of the wheel hub drive unit assembly. Each housing contains multiple braking chambers. One end of the piston is embedded in a braking chamber, while the other end extends outside the chamber and abuts against the brake disc. The piston slides within the braking chamber of the housing and forms a sealed connection with the chamber through a sealing ring in an annular groove. The four housings are evenly arranged circumferentially around the brake disc and connected to the four braking chambers at the oil supply end of the brake line, driving the pistons to slide to abut against the brake disc or spaced apart. When hydraulic oil is introduced into the braking chambers, it pushes the four calipers to slide to abut against the brake disc, thus achieving the braking function of the wheel hub drive unit assembly. The brake line does not need to move, maximizing the outer diameter of the motor. Simultaneously, the four calipers apply force to the brake disc circumferentially, resulting in strong braking capability, uniform force distribution on the brake disc, and good braking effect. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of a fixed hydraulic brake for a hub drive unit assembly provided in an embodiment of the present invention;

[0018] Figure 2 This is a schematic diagram of the caliper in a fixed hydraulic brake for a hub drive unit assembly provided in an embodiment of the present invention.

[0019] Figure 3 This is a schematic diagram showing the mounting hole arrangement of the caliper in a fixed hydraulic brake for a hub drive unit assembly provided in an embodiment of the present invention.

[0020] Figure 4 This is a schematic diagram of the brake pipeline in a fixed hydraulic brake for a hub drive unit assembly provided in an embodiment of the present invention;

[0021] Figure 5 This is a schematic diagram of the oil supply pipeline in a fixed hydraulic brake for a hub drive unit assembly provided in an embodiment of the present invention. Detailed Implementation

[0022] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0023] like Figure 1-2As shown, the present invention provides a fixed hydraulic brake for a wheel hub drive unit assembly, mounted on a wheel hub drive unit assembly 100. It includes a brake disc 200, four calipers 300, and a brake line 400. The brake disc 200 is connected to the rotating end of the wheel hub drive unit assembly 100. Each of the four calipers 300 includes a housing 310 and a piston 330. All four housings 310 are fixedly connected to the motor housing of the wheel hub drive unit assembly 100. Each housing 310 has multiple brake chambers 320. One end of the piston 330 is built into the brake cavity 320, and the other end of the piston 330 extends to the outside of the brake cavity 320 and can abut against the brake disc 200. The piston 330 slides in the brake cavity of the housing 310 and forms a sealed connection with the brake cavity through the sealing ring installed in the annular groove in the brake cavity. The four housings 310 are evenly arranged around the brake disc 200. The oil supply end of the brake line 400 is connected to the four brake cavities 320 to drive the piston 330 to slide to abut against the brake disc 200 or to be spaced apart.

[0024] In implementation, the brake disc 200 is connected to the rotating end of the wheel hub drive unit assembly 100, and the brake disc 200 rotates synchronously with the rotating end of the wheel hub drive unit assembly 100. Four calipers 300 are provided, each including a housing 310 and a piston 330. All four housings 310 are fixedly connected to the motor housing of the wheel hub drive unit assembly 100. Each housing 310 has a brake chamber 320. One end of the piston 330 is housed within the brake chamber 320, and the other end extends outside the brake chamber 320 and can abut against the brake disc 200. The piston 330 slides within the brake chamber 320 and forms a seal with the brake chamber through a sealing ring installed in the annular groove within the brake chamber. The four housings 310 are evenly arranged around the circumference of the brake disc 200 and are connected to the brake chambers 320 inside the four housings through the oil supply end of the brake line 400. This is used to drive the piston 330 to slide to abut against the brake disc 200 or to be spaced apart. When hydraulic oil is introduced into the brake chamber 320, it pushes the piston 330 to slide to abut against the brake disc 200, thereby realizing the braking function of the hub drive unit assembly 100. The brake line 400 does not need to move, which maximizes the outer diameter of the motor. At the same time, the four calipers 300 apply force to the brake disc 200 around the circumference of the brake disc 200, resulting in strong braking capacity, uniform force on the brake disc 200, and good braking effect.

[0025] It should be noted that the motor is mounted at the front end of the hub drive unit assembly 100, and the output shaft of the motor passes through the hub drive unit assembly 100.

[0026] In this embodiment, the brake disc 200 is mounted on the rotating end hub, which is connected to the motor shaft. The speed of the motor output shaft is controlled by controlling the speed of the brake disc 200.

[0027] In this embodiment, the caliper 300 is the structure for achieving the above-mentioned braking. Specifically, each of the four calipers 300 includes a housing 310 and a piston 330. The four housings 310 are fixedly connected to the motor housing of the wheel hub drive unit assembly 100. The housing 310 has multiple braking chambers 320. One end of the piston 330 is built into the braking chamber 320, and the other end of the piston 330 extends to the outside of the braking chamber 320 and can abut against the brake disc 200. The piston 330 slides with the housing 310 and forms a sealed connection with the braking chamber through the sealing ring installed in the annular groove in the braking chamber. The four housings 310 are evenly arranged around the circumference of the brake disc 200.

[0028] like Figure 3 As shown, to avoid interference between the housing 310 and the brake disc 200 during installation, in one embodiment, a mounting hole 311 is provided on the side of the housing 310 away from the brake disc 200. A fixing screw is provided in the mounting hole 311, and the fixing screw is threadedly connected to a threaded hole on the motor housing of the hub drive unit assembly 100. The mounting hole 311 is outside the outer circumference of the brake disc 200, so the fixing screw is not obstructed by the brake disc 200 when the caliper 300 is installed.

[0029] In one embodiment, a gap is formed between two adjacent housings 310 to facilitate the routing of the wheel speed sensor harness, the reducer vent hose, and the central vent hose from the gap.

[0030] In one embodiment, the piston 330 is cylindrical, and a sealing ring is fitted on the outer wall of the piston 330. The sealing ring is installed in the annular groove of the brake cavity 320 and forms a sealed connection with the piston and the brake cavity.

[0031] In one embodiment, each caliper 300 contains a plurality of pistons 330, which are arranged sequentially along the circumference of the brake disc 200.

[0032] In this embodiment, the brake line 400 provides power for the sliding of the piston 330 by supplying hydraulic oil into the brake chamber 320, thereby pushing the piston 330 to slide to different positions. Specifically, the oil supply end of the brake line 400 is connected to the brake chambers 320 in the four housings to drive the piston 330 to slide to abut against or be spaced apart from the brake disc 200.

[0033] like Figure 4 As shown, in one embodiment, the brake line 400 includes two connecting lines 410 and an oil supply line 420, wherein the brake chambers 320 of the two calipers 300 are connected to each other via a connecting line 410, and the brake chambers 320 of the other two calipers 300 are connected to each other via another connecting line 410, and the oil supply line 420 is connected to both connecting lines 410 respectively.

[0034] Each housing 310 has an oil inlet and an oil outlet that are connected to the brake chamber 320. The oil inlets of two housings 310 are connected to two connecting pipes 410 respectively. The oil outlets of two housings 310 are equipped with vent screws. The oil outlets of the other two housings 310 are connected to two connecting pipes 410 respectively. The oil inlets of the other two housings 310 are connected to the oil supply pipe 420.

[0035] like Figure 5 As shown, the oil supply pipeline 420 includes an oil inlet pipe 421, a tee connector 422, a branch pipe 423, and an oil inlet connector 424. One end of the oil inlet pipe 421 is connected to the tee connector 422. The tee connector 422 is connected to the oil inlet port of one of the housings 310. The tee connector 422 is connected to the oil inlet connector 424 via the branch pipe 423. The oil inlet connector 424 is connected to the oil inlet port of the other housing 310.

[0036] It should be noted that, in the vehicle's mounting position, the intersection of the center line of the oil outlet of the lower left caliper 300 and the lower right caliper 300 with the inner wall of their respective brake chambers should be within 2mm below the maximum fluid level of the caliper. This ensures that there is no dead space when bleeding the brake fluid. Similarly, the intersection of the center line of the bleed outlet (used to install the bleed screw) of the upper left caliper 300 and the upper right caliper 300 with the inner wall of their respective brake chambers should be within 2mm below the maximum fluid level of the caliper. This also ensures that there is no dead space when bleeding the brake fluid.

[0037] To facilitate the fixing of the brake line 400 relative to the hub drive unit assembly 100, in one embodiment, the oil inlet line 421 is connected to an external hydraulic source via a main connector, which is detachably connected to the hub drive unit assembly 100.

[0038] It should be noted that both connecting pipes 410 and the oil supply pipe 420 are rigid pipes to prevent deformation or movement that could lead to contact with the motor and subsequent aging due to high temperatures. This also reduces the required installation space, allowing for a larger motor outer diameter and maximizing motor power. This design overcomes the drawback of using a floating caliper 300, where the oil inlet hose is prone to interference with other components.

[0039] Compared with the prior art: By connecting the brake disc 200 to the rotating end of the wheel hub drive unit assembly 100, the brake disc 200 rotates synchronously with the rotating end of the wheel hub drive unit assembly 100. By providing four calipers 300, each including a housing 310 and a piston 330, all four housings 310 are fixedly connected to the motor housing of the wheel hub drive unit assembly 100. Each housing 310 has multiple brake chambers 320. One end of the piston 330 is built into a brake chamber 320, and the other end extends outside the brake chamber 320 and can abut against the brake disc 200. The piston 330 slides within the brake chamber 320 and is sealed by a seal in an annular groove within the brake chamber. The ring and the brake chamber form a sealed connection. The four outer shells 310 are evenly arranged around the brake disc 200 and are connected to the four brake chambers 320 at the oil supply end of the brake line 400. This is used to drive the piston 330 to slide to abut against the brake disc 200 or to be spaced apart. When hydraulic oil is introduced into the brake chamber 320, it pushes the piston 330 to abut against the brake disc 200, thereby realizing the braking function of the wheel hub drive unit assembly 100. The brake line 400 does not need to move, so as to maximize the outer diameter of the motor. At the same time, the four calipers 300 apply a force to the brake disc 200 around the circumference of the brake disc 200. The braking capacity is strong, the brake disc 200 is evenly stressed, and the braking effect is good.

[0040] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A fixed hydraulic brake for a hub drive unit assembly, mounted on the drive unit assembly, characterized in that, Includes brake discs, four calipers, and brake lines; The brake disc is connected to the rotating end of the hub drive unit assembly; Each of the four calipers includes a housing and a piston. Each of the four housings is fixedly connected to the motor housing of the wheel hub drive unit assembly. Each housing has multiple brake chambers. One end of the piston is built into the brake chamber, and the other end of the piston extends out of the brake chamber and can abut against the brake disc. The piston slides in the brake chamber and forms a sealed connection with the brake chamber through a sealing ring installed in the annular groove in the brake chamber. The four housings are evenly arranged around the circumference of the brake disc. The oil supply end of the brake line is connected to the four brake chambers inside the housing, which is used to drive the piston to slide to abut against or be spaced apart from the brake disc; The brake line includes two connecting lines and an oil supply line. The brake chambers of the two calipers are connected via one connecting line, and the brake chambers of the other two calipers are connected via another connecting line. The oil supply line is connected to both connecting lines respectively. Each of the housings has an oil inlet and an oil outlet connected to the brake chamber. The oil outlet is located within 2 mm below the highest fluid level in the caliper. The oil inlets of two housings are connected to two connecting pipes, and the oil outlets of two housings are equipped with vent screws. The oil outlets of the other two housings are connected to two connecting pipes, and the oil inlets of the other two housings are connected to an oil supply pipe. The oil supply pipeline includes an oil inlet pipe, a tee connector, a branch pipe, and an oil inlet connector. One end of the oil inlet pipe is connected to the tee connector, the tee connector is connected to the oil inlet of one of the outer casings, the tee connector is connected to the oil inlet connector via the branch pipe, and the oil inlet connector is connected to the oil inlet of the other outer casing.

2. The fixed hydraulic brake for a hub drive unit assembly according to claim 1, characterized in that, The outer casing has a mounting hole on the side away from the brake disc, and a fixing screw is provided in the mounting hole. The fixing screw is threadedly connected to a threaded hole on the motor housing of the hub drive unit assembly.

3. The fixed hydraulic brake for a hub drive unit assembly according to claim 1, characterized in that, The piston is cylindrical, and a sealing ring is provided on the outer wall of the piston. The sealing ring is installed in an annular groove opened in the braking chamber and forms a sealed connection with the outer circle of the piston.

4. The fixed hydraulic brake for a hub drive unit assembly according to claim 1, characterized in that, Each caliper contains multiple pistons, which are arranged sequentially along the circumference of the brake disc.

5. The fixed hydraulic brake for a hub drive unit assembly according to claim 1, characterized in that, The oil inlet pipe is connected to an external hydraulic power source via a main connector, which is detachably connected to the wheel hub drive unit assembly.

6. The fixed hydraulic brake for a hub drive unit assembly according to claim 1, characterized in that, Both of the connecting pipelines and the oil delivery pipeline are rigid pipelines.

7. The fixed hydraulic brake for a hub drive unit assembly according to claim 1, characterized in that, A gap is formed between two adjacent outer shells.

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