A new parking brake system for a hydraulic motor

Abstract

The utility model discloses a novel parking brake system of hydraulic motor, including stator, rotor assembly and motor front cover, rotor assembly connects output shaft, be provided with gear type brake piston in the motor front cover, be provided with first brake tooth on gear type brake piston, and rotor assembly includes rotor and plunger, and plunger does piston movement in the plunger cavity of rotor, and the side wall of rotor towards gear type brake piston is provided with second brake tooth, and first brake tooth and second brake tooth interlock and realize the brake, and the motor front cover is provided with spring cavity, and reset spring is provided in spring cavity, and reset spring promotes gear type brake piston and moves to rotor direction, makes first brake tooth and second brake tooth interlock, the motor front cover still is provided with hydraulic chamber, and high pressure hydraulic oil is injected when the motor starts in hydraulic chamber, and gear type brake piston moves in reverse, makes first brake tooth and second brake tooth separate each other, and its advantage lies in that the overall space ratio of motor is greatly reduced, and the brake performance stability is improved.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic motors, and in particular to a novel parking brake system for a hydraulic motor. Background Technology

[0002] In the field of hydraulic transmission, low-speed, high-torque radial piston motors are widely used in heavy-duty operation scenarios such as construction machinery, mining equipment, ship deck machinery, and heavy vehicles due to their advantages such as high output torque, wide speed range, and strong load resistance. These types of equipment often require a stable parking effect when stopped to prevent accidental movement due to load weight or external forces. Therefore, the parking brake, as a core component ensuring operational safety and reliability, directly affects the operating efficiency and adaptability of the entire hydraulic system through its performance and structural design.

[0003] Currently, mainstream low-speed, high-torque radial piston motor parking brakes on the market exhibit a high degree of homogeneity in their structural design, with the vast majority employing a rear-mounted brake cylinder design. The core principle of this design is to independently install a cylindrical brake cylinder at the rear of the motor. The linear motion of the piston inside the cylinder pushes the friction pads into contact with the brake disc (or brake drum), generating braking torque through the static friction between the friction pads, thereby achieving rotor locking and parking functions. From a technical application perspective, while the rear-mounted brake cylinder structure can meet basic parking requirements, its long-term practical application has gradually revealed two major, insurmountable limitations, making it unsuitable for the development trends of modern hydraulic systems.

[0004] The drawback of the existing technology is that the spatial layout of the rear-mounted brake cylinder structure has significant defects. Since the brake cylinder needs to be installed as an independent component on the outside of the motor's rear cover, its own cylinder structure, connecting flange, oil pipe interface, etc., all require additional axial and radial space, resulting in a significant increase in the overall size of the motor. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a novel parking brake system for a hydraulic motor, which can achieve parking braking without the need for additional pressure and can significantly reduce the size of the hydraulic motor.

[0006] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: a novel parking brake system for a hydraulic motor, including a stator, a rotor assembly, and a motor front cover. The rotor assembly is connected to an output shaft. The system is characterized by having a toothed brake piston inside the motor front cover, with a first brake tooth on the toothed brake piston. The rotor assembly includes a rotor and a plunger. The plunger moves within the plunger cavity of the rotor. A second brake tooth is provided on the side wall of the rotor facing the toothed brake piston. The first and second brake teeth mesh with each other to achieve braking. A spring cavity is provided inside the motor front cover, with a return spring inside. The return spring pushes the toothed brake piston towards the rotor, causing the first and second brake teeth to mesh with each other. A hydraulic cavity is also provided inside the motor front cover. When the motor starts, high-pressure hydraulic oil is injected into the hydraulic cavity, pushing the toothed brake piston in the opposite direction, causing the first and second brake teeth to separate.

[0007] A further preferred embodiment of this utility model is as follows: the toothed brake piston is provided with a first fixed tooth, and the motor front cover is provided with a second fixed tooth. During the movement of the toothed brake piston, the first fixed tooth and the second fixed tooth continuously change between a fully engaged state and a partially engaged state.

[0008] A further preferred embodiment of this utility model is: the rotor is annular, and the second braking teeth are evenly distributed on the side wall surface of the rotor.

[0009] A further preferred embodiment of this utility model is: the toothed brake piston includes a meshing part, a connecting part, and a driving part, with the connecting part disposed between the meshing part and the driving part.

[0010] A further preliminary option of this utility model is: the first braking tooth and the first fixing tooth are arranged on both sides of the meshing part, and the first braking tooth and the first fixing tooth extend in opposite directions.

[0011] A further preliminary option of this utility model is: the spring cavity and the hydraulic cavity are arranged on both sides of the drive unit, the reset spring applies pressure to the drive unit in the direction of the rotor, and the hydraulic oil in the hydraulic cavity applies pressure to the drive unit in the direction of the reset spring.

[0012] A further preliminary option of this utility model is: an auxiliary ring is provided inside the front cover of the motor, the auxiliary ring is located between the toothed brake piston and the rotor assembly, and the auxiliary ring, the meshing part and the connecting part together form a hydraulic chamber.

[0013] A further preferred embodiment of this utility model is as follows: a first sealing ring is provided between the drive unit and the inner wall of the motor front cover, a second sealing ring is provided between the outer ring of the auxiliary ring and the inner wall of the front cover, and a third sealing ring is provided between the inner ring of the auxiliary ring and the connecting part.

[0014] Compared with existing technologies, this utility model achieves three core technological effects by integrating a toothed brake piston, spring chamber, and hydraulic chamber within the motor front cover, replacing the traditional rear-mounted brake cylinder: First, structurally, the external brake cylinder is eliminated, and the braking components are integrated using the cavity inside the front cover, significantly reducing the overall space ratio of the motor and meeting the compact and lightweight requirements of the hydraulic system; Second, braking is achieved through the rigid meshing of the first and second brake teeth, which provides greater braking torque and stronger rigidity compared to traditional friction pad static friction braking, effectively reducing the risk of brake failure and improving braking performance stability; Third, the automatic switching between parking brake and brake release is achieved by using the reverse drive of the return spring and high-pressure hydraulic oil, eliminating the need for additional complex control mechanisms, simplifying the system structure, and reducing raw material and manufacturing costs. Attached Figure Description

[0015] Figure 1 This is a side view of the present invention;

[0016] Figure 2 This is a cross-sectional view of the present invention;

[0017] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0018] Figure 4 A three-dimensional view of a toothed brake piston;

[0019] Figure 5 The explosion after removing the stator in this utility model Figure 1 ;

[0020] Figure 6 The explosion after removing the stator in this utility model Figure 2 . Detailed Implementation

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0022] like Figures 1-6As shown, a novel parking brake system for a hydraulic motor includes a stator 1, a rotor assembly 2, and a motor front cover 3. The rotor assembly 2 is connected to an output shaft 5. A toothed brake piston 6 is disposed inside the motor front cover 3, and a first brake tooth 7 is disposed on the toothed brake piston 6. The rotor assembly 2 includes a rotor 8 and a plunger. The plunger performs piston movement within the plunger cavity of the rotor 8. A second brake tooth 11 is disposed on the side wall of the rotor 8 facing the toothed brake piston 6. The first brake tooth 7 and the second brake tooth 11 mesh with each other to achieve braking. A spring cavity 12 is disposed inside the motor front cover 3, and a return spring 13 is disposed inside the spring cavity 12. The return spring 13 pushes the toothed brake piston 6 to move towards the rotor 8, so that the first brake tooth 7 and the second brake tooth 11 mesh with each other. A hydraulic cavity 14 is also disposed inside the motor front cover 3. The hydraulic cavity 14 injects high-pressure hydraulic oil through a hydraulic oil injection channel when the motor starts, which pushes the toothed brake piston 6 in the opposite direction to move, so that the first brake tooth 7 and the second brake tooth 11 separate from each other. By integrating a toothed brake piston 6, a spring chamber 12, and a hydraulic chamber 14 within the motor front cover 3, replacing the traditional rear-mounted brake cylinder, three core technological effects are achieved: First, structurally, the external brake cylinder is eliminated, and the braking components are integrated using the cavity inside the front cover, significantly reducing the overall space ratio of the motor and meeting the compact and lightweight requirements of the hydraulic system; Second, braking is achieved through the rigid meshing of the first brake tooth 7 and the second brake tooth 11, which provides greater braking torque and stronger rigidity compared to traditional friction pad static friction braking, effectively reducing the risk of brake failure and improving braking performance stability; Third, the automatic switching between parking brake and brake release is achieved by using the reverse drive of the return spring 13 and high-pressure hydraulic oil, eliminating the need for additional complex control mechanisms, simplifying the system structure, and reducing raw material and manufacturing costs.

[0023] The toothed brake piston 6 is provided with a first fixed tooth 21, and the motor front cover 3 is provided with a second fixed tooth 22. During the movement of the toothed brake piston 6, the first fixed tooth 21 and the second fixed tooth 22 continuously change between a fully engaged state and a partially engaged state. By providing the first fixed tooth 21 on the toothed brake piston 6 and the second fixed tooth 22 on the motor front cover 3, and by having both continuously change between a fully engaged state and a partially engaged state during piston movement, on the one hand, the circumferential rotation of the toothed brake piston 6 can be restricted through tooth meshing, preventing tooth misalignment due to force shift during braking and release, and ensuring the meshing accuracy of the first brake tooth 7 and the second brake tooth 11; on the other hand, the partially engaged state can provide buffering during piston movement, reducing impact wear at the moment of tooth contact, extending the service life of the brake piston and the front cover 3, and maintaining the structural stability of the braking system.

[0024] The rotor 8 is annular, and the second braking teeth 11 are evenly distributed on the sidewall surface of the rotor 8. The annular design of the rotor 8 and the even distribution of the second braking teeth 11 on the sidewall surface of the rotor 8 result in a more balanced force distribution on the rotor 8: Firstly, the evenly distributed second braking teeth 11 can form multi-point synchronous meshing with the first braking teeth 7 of the toothed brake piston 6, avoiding localized overload of the teeth and improving the transmission efficiency of braking torque; secondly, the annular rotor 8 and the even tooth layout are adapted to the structural characteristics of a radial piston motor, ensuring that when the piston moves normally within the piston cavity, the rotation of the rotor 8 is not affected by the braking tooth layout, thus guaranteeing the stability and continuity of the motor's power output.

[0025] The toothed brake piston 6 includes a meshing part 23, a connecting part 24, and a driving part 25, with the connecting part 24 positioned between the meshing part 23 and the driving part 25. By dividing the toothed brake piston 6 into the meshing part 23, the connecting part 24, and the driving part 25, and with the connecting part 24 positioned between the other two parts, functional zoning is optimized: the meshing part 23 can focus on setting the brake teeth and the fixed teeth, ensuring the precision of the tooth machining and the reliability of the meshing; the driving part 25 can specifically cooperate with the spring chamber 12 and the hydraulic chamber 14 to accurately receive the thrust of the return spring 13 and the pressure of the hydraulic oil 15, ensuring that the piston's movement direction and force are controllable; the connecting part 24 can be flexibly designed according to the internal space 17 of the front cover to achieve a smooth connection between the meshing part 23 and the driving part 25, while also reserving installation positions for components such as seals and auxiliary rings 27, improving the overall structural integration.

[0026] The first braking tooth 7 and the first fixed tooth 21 are arranged on both sides of the meshing part 23. The first braking tooth 7 and the first fixed tooth 21 extend in opposite directions. On the one hand, the functions of the two tooth structures are clearly separated. The first braking tooth 7 focuses on cooperating with the second braking tooth 11 of the rotor 8 to realize parking brake, and the first fixed tooth 21 focuses on cooperating with the second fixed tooth 22 of the front cover 3 to restrict the circumferential rotation of the piston and avoid functional interference. On the other hand, the oppositely extended layout is adapted to the position distribution of the spring cavity 12, hydraulic cavity 14 and rotor 8 in the front cover 3, so that the toothed brake piston 6 can simultaneously meet the requirements of braking engagement and self-positioning in a limited space, further optimizing the space utilization of the internal structure of the front cover 3.

[0027] Spring chamber 12 and hydraulic chamber 14 are located on both sides of drive unit 25. Return spring 13 applies pressure to drive unit 25 in the direction of rotor 8, and hydraulic oil 15 in hydraulic chamber 14 applies pressure to drive unit 25 in the direction of return spring 13. By separating spring chamber 12 and hydraulic chamber 14 on both sides of drive unit 25, and by applying opposite pressures to drive unit 25 by return spring 13 and hydraulic oil 15 respectively, a highly efficient bidirectional drive mechanism is formed: First, the pressure on both sides acts directly on drive unit 25, reducing force transmission loss and making the movement response of toothed brake piston 6 more rapid, thus improving the switching efficiency of braking and releasing braking; second, the balanced design of opposite pressure can accurately control the piston position. When the pressure of hydraulic oil 15 overcomes the spring force, the brake release state can be stably maintained. When the hydraulic oil 15 is depressurized, the spring can quickly push the piston to return to the original position to achieve braking, ensuring the operational reliability of the braking system.

[0028] An auxiliary ring 27 is provided inside the motor front cover 3. The auxiliary ring 27 is located between the toothed brake piston 6 and the rotor assembly 2. The auxiliary ring 27, the meshing part 23, and the connecting part 24 together form the hydraulic chamber 14. The auxiliary ring 27 can isolate the brake teeth from the hydraulic chamber 14, preventing hydraulic oil 15 from leaking into the tooth meshing area and affecting the braking effect. At the same time, it protects the side wall of the rotor 8 from direct corrosion by the hydraulic oil 15, extending the service life of the rotor 8 and the brake piston.

[0029] A first sealing ring 28 is provided between the drive unit 25 and the inner wall of the motor front cover 3; a second sealing ring 29 is provided between the outer ring of the auxiliary ring 27 and the inner wall of the front cover 3; and a third sealing ring 30 is provided between the inner ring of the auxiliary ring 27 and the connecting part 24. This constructs a triple sealing protection system: First, the first sealing ring 28 prevents oil leakage between the hydraulic chamber 14 and the spring chamber 12, avoiding hydraulic oil 15 entering the spring chamber 12 and causing the return spring 13 to rust or fail; second, the second sealing ring 29 and the third sealing ring 30 respectively block oil leakage between the hydraulic chamber 14 and the outside of the front cover 3, and between the hydraulic chamber 14 and the rotor 8, ensuring the sealing performance of the hydraulic system, reducing oil waste and environmental pollution, while maintaining stable pressure within the hydraulic chamber 14 and ensuring the reliability of the brake release action.

[0030] The present invention provides a detailed description of a novel parking brake system based on a hydraulic motor. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The descriptions of these embodiments are merely for the purpose of aiding understanding the present invention and its core concepts. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from its principles, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A novel parking brake system for a hydraulic motor, comprising a stator, a rotor assembly, and a motor front cover, wherein the rotor assembly is connected to an output shaft, characterized in that... The motor front cover contains a toothed brake piston with a first brake tooth. The rotor assembly includes a rotor and a plunger. The plunger moves within the plunger cavity of the rotor. A second brake tooth is located on the side wall of the rotor facing the toothed brake piston. The first and second brake teeth mesh with each other to achieve braking. The motor front cover also contains a spring cavity with a return spring. The return spring pushes the toothed brake piston towards the rotor, causing the first and second brake teeth to mesh. The motor front cover also contains a hydraulic cavity. When the motor starts, high-pressure hydraulic oil is injected into the hydraulic cavity, which pushes the toothed brake piston in the opposite direction, causing the first and second brake teeth to separate.

2. A novel parking brake system for a hydraulic motor according to claim 1, characterized in that... The toothed brake piston is provided with a first fixed tooth, and the motor front cover is provided with a second fixed tooth. During the movement of the toothed brake piston, the first fixed tooth and the second fixed tooth continuously change between a fully engaged state and a partially engaged state.

3. A novel parking brake system for a hydraulic motor according to claim 1, characterized in that... The rotor is circular, and the second braking teeth are evenly distributed on the side wall surface of the rotor.

4. A novel parking brake system for a hydraulic motor according to claim 1, characterized in that... The toothed brake piston includes a meshing part, a connecting part, and a driving part, with the connecting part disposed between the meshing part and the driving part.

5. A novel parking brake system for a hydraulic motor according to claim 4, characterized in that... The first braking tooth and the first fixing tooth are disposed on both sides of the meshing portion, and the first braking tooth and the first fixing tooth extend in opposite directions.

6. A novel parking brake system for a hydraulic motor according to claim 4, characterized in that... The spring cavity and hydraulic cavity are located on both sides of the drive unit. The return spring applies pressure to the drive unit in the direction of the rotor, and the hydraulic oil in the hydraulic cavity applies pressure to the drive unit in the direction of the return spring.

7. A novel parking brake system for a hydraulic motor according to claim 4, characterized in that... An auxiliary ring is provided inside the motor front cover. The auxiliary ring is located between the toothed brake piston and the rotor assembly. The auxiliary ring, the meshing part, and the connecting part together form a hydraulic chamber.

8. A novel parking brake system for a hydraulic motor according to claim 7, characterized in that... A first sealing ring is provided between the drive unit and the inner wall of the motor front cover, a second sealing ring is provided between the outer ring of the auxiliary ring and the inner wall of the front cover, and a third sealing ring is provided between the inner ring of the auxiliary ring and the connecting part.

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