A hydraulic motor parking brake system

Abstract

The utility model discloses a kind of parking brake systems of hydraulic motor, including stator, rotor assembly, motor front cover and motor rear cover, rotor assembly connects output shaft, motor rear cover is provided with matching flow shaft, output shaft passes through motor front cover and connects outside, matching flow shaft is provided with brake cavity, brake cavity is provided with brake shaft that can move horizontally, brake spring is provided in brake shaft, brake shaft and matching flow shaft are provided with power cavity, insertion cavity is provided in rotor assembly, for brake shaft insertion and removal, brake shaft is provided with outer tooth, insertion cavity is provided with first inner tooth, brake shaft is inserted into insertion cavity to realize the meshing of outer tooth and first inner tooth, its advantage lies in without additional pressure supply can realize parking brake, and can substantially reduce the volume of hydraulic motor.

Description

Technical Field

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

[0002] In the field of hydraulic transmission, hydraulic motors, as the core component that converts hydraulic energy into mechanical energy, are widely used in various scenarios such as engineering machinery, mining equipment, and marine machinery. To ensure the safety and operability of equipment operation, hydraulic motors typically need to be equipped with a complete braking system, which mainly includes a service braking system and a parking braking system.

[0003] The service braking system is mainly used to quickly adjust the output speed of the hydraulic motor or to brake it in an emergency when the hydraulic motor is rotating by applying braking force. For example, braking operations during equipment operation require a rapid response and the braking force can be adjusted as needed to meet the braking requirements of the equipment under different working conditions.

[0004] The parking brake system is used to provide stable braking force when the hydraulic motor stops rotating to prevent the motor from rotating unexpectedly due to external loads or its own weight, thereby ensuring that the equipment is fixed in position when it is stopped and avoiding safety accidents.

[0005] Currently, most existing hydraulic motor parking brake systems employ a friction pad structure. Their braking principle relies on the static friction generated by the mutual compression between the friction pads. This static friction counteracts external forces that could cause the motor to rotate, thus achieving a parking brake effect. However, this traditional structure has significant limitations:

[0006] On the one hand, its braking rigidity is poor. Since the magnitude of static friction is affected by factors such as the material properties of the friction pads and the pressure of the contact surface, and the friction pads are prone to wear and deformation during long-term use, a large pressure needs to be continuously provided during actual braking to maintain stable braking force. This not only increases energy consumption, but also makes it difficult to guarantee braking reliability under heavy load or harsh working conditions.

[0007] On the other hand, traditional parking brake systems typically require an external brake cylinder, which drives the friction pads to achieve the squeezing action. This design not only increases the overall size of the hydraulic motor, reducing its applicability in scenarios with limited installation space, but also increases the number of parts and assembly complexity, raising the manufacturing cost and maintenance difficulty of the equipment. Utility Model Content

[0008] The technical problem to be solved by this utility model is to provide a 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.

[0009] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: a parking brake system for a hydraulic motor, including a stator, a rotor assembly, a front cover of the motor, and a rear cover of the motor. The rotor assembly is connected to an output shaft, and a distribution shaft is provided inside the rear cover of the motor. The output shaft passes through the front cover of the motor and connects to the outside. The characteristic is that a brake chamber is provided inside the distribution shaft, a brake shaft that can move laterally is provided inside the brake chamber, a brake spring is provided inside the brake shaft, a power chamber is provided between the brake shaft and the distribution shaft, and an insertion chamber for inserting and removing the brake shaft is provided inside the rotor assembly. External teeth are provided outside the brake shaft, and a first internal tooth is provided inside the insertion chamber. The brake shaft is inserted into the insertion chamber to achieve meshing between the external teeth and the first internal teeth. When the hydraulic motor is running, hydraulic oil is injected into the power chamber, and the power chamber pushes the brake shaft to squeeze the brake spring, continuously keeping the brake shaft and the insertion chamber in a separated state. When the hydraulic motor is stopped, the injection of hydraulic oil into the power chamber stops, the brake shaft is squeezed by the brake spring, and the brake shaft is pushed into the insertion chamber. After the external teeth and the first internal teeth mesh, the rotor assembly cannot rotate.

[0010] A further preferred embodiment of this utility model is: the distribution shaft is provided with a second internal tooth on the inner wall of the braking cavity, the second internal tooth and the external tooth continuously mesh, which plays a lateral guiding role and prevents the braking shaft from rotating relative to the distribution shaft.

[0011] A further preliminary option of this utility model is: the power chamber includes a first side and a second side, the first side is close to the brake spring, the second side is close to the brake assembly, and the area of ​​the first side is larger than the area of ​​the second side.

[0012] A further preliminary option of this utility model is: a first sealing ring and a second sealing ring are respectively provided on both sides of the power cavity.

[0013] A further preliminary option of this utility model is: one end of the brake spring is inserted into the spring cavity of the brake shaft, and the other end of the brake spring abuts against the side plate of the motor rear cover.

[0014] A further preferred embodiment of this utility model is: an oil drain channel is provided inside the brake shaft, and the oil drain channel connects the brake chamber and the insertion chamber.

[0015] A further preferred embodiment of this utility model is: a positioning pin is provided on the brake shaft to prevent the brake shaft from tilting during movement.

[0016] A further preferred embodiment of this utility model is: the first internal tooth and / or the external tooth is provided with a tooth guide surface, so that the external tooth and the first internal tooth can effectively bite together.

[0017] A further preliminary option of this utility model is: the auxiliary pump is installed between the sensor integrated valve and the system oil tank, and the hydraulic oil is transferred from the system oil tank to the sensor integrated valve through the auxiliary pump.

[0018] Compared with the prior art, this utility model eliminates the need for an external brake cylinder by setting a brake shaft and brake spring inside the distribution shaft, reducing raw material costs, shrinking the overall space ratio of the motor, and making the layout of the oil passages and hydraulic system more compact. At the same time, the parking brake is achieved by using the spline engagement between the brake shaft and the rotor assembly. Compared with the static friction braking of traditional friction pads, this improves braking rigidity, braking torque and braking capacity. It can also release the brake shaft by compressing the spring with hydraulic oil when the motor starts, and achieve braking by engaging the brake shaft with the spring when the motor stops, thus meeting parking requirements. Attached Figure Description

[0019] Figure 1 This is a side view of the present invention;

[0020] Figure 2 This is a schematic diagram of the structure of this utility model in the parked and locked state;

[0021] Figure 3 This is a schematic diagram of the structure of this utility model in the unlocked state;

[0022] Figure 4 Explosion of the distribution shaft, output shaft, and rotor assembly Figure 1 ;

[0023] Figure 5 Explosion of the distribution shaft, output shaft, and rotor assembly Figure 2 ;

[0024] Figure 6 This is a 3D view of the brake shaft. Detailed Implementation

[0025] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0026] like Figures 1-6As shown, a parking brake system for a hydraulic motor includes a stator 1, a rotor assembly 2, a motor front cover 3, and a motor rear cover 4. The rotor assembly 2 is connected to an output shaft 5. A distribution shaft 6 is disposed within the motor rear cover 4. The output shaft 5 passes through the motor front cover 3 and connects to the outside. A brake chamber 7 is disposed within the distribution shaft 6. A laterally movable brake shaft 8 is disposed within the brake chamber 7. A brake spring 9 is disposed within the brake shaft 8. A power chamber 10 is disposed between the brake shaft 8 and the distribution shaft 6. An insertion chamber 11 is disposed within the rotor assembly 2 for inserting and removing the brake shaft 8. The rotor assembly 2 is provided with an external tooth 12 and an internal tooth 13 inside the insertion cavity 11. The brake shaft 8 is inserted into the insertion cavity 11 to achieve the meshing of the external tooth 12 and the internal tooth 13. When the hydraulic motor is running, hydraulic oil is injected into the power cavity 10. The power cavity 10 pushes the brake shaft 8 to squeeze the brake spring 9 and keeps the brake shaft 8 and the insertion cavity 11 in a separated state. When the hydraulic motor is stopped, the injection of hydraulic oil into the power cavity 10 stops. The brake shaft 8 is squeezed by the brake spring 9 and pushed into the insertion cavity 11. After the external tooth 12 and the internal tooth 13 mesh, the rotor assembly 2 cannot rotate. By setting a brake shaft 8 and a brake spring 9 inside the distribution shaft 6, the external brake cylinder is eliminated, reducing raw material costs and the overall space ratio of the motor, making the layout of the oil passage and hydraulic system more compact. At the same time, parking brake is achieved by using the spline engagement between the brake shaft 8 and the rotor assembly 2. Compared with the static friction braking of traditional friction pads, this improves braking rigidity, braking torque and braking capacity. Furthermore, when the motor starts, the brake shaft 8 can be released by compressing the spring with hydraulic oil, and when the motor stops, the brake shaft 8 can be engaged by the spring to achieve braking, thus meeting parking requirements.

[0027] The distribution shaft 6 has a second internal tooth 14 on the inner wall of the braking chamber 7. The second internal tooth 14 and the external tooth 12 continuously mesh, which plays a lateral guiding role and prevents the braking shaft 8 from rotating relative to the distribution shaft 6. The second internal tooth 14 on the inner wall of the distribution shaft 6 and the external tooth 12 of the braking shaft 8 continuously mesh, which plays a lateral guiding role, prevents the braking shaft 8 from tilting when moving, and avoids the braking shaft 8 from rotating relative to the distribution shaft 6. This ensures the stability of the braking shaft 8 when it meshes with the rotor assembly 2, further optimizes the structural performance, and meets the requirements of compactness.

[0028] The power chamber 10 includes a first side 15 and a second side 16. The first side 15 is close to the brake spring 9, and the second side 16 is close to the brake assembly. The area of ​​the first side 15 is larger than the area of ​​the second side 16. The difference in side area is to differentiate the brake shaft 8 from the brake spring 9 when hydraulic oil is injected. When the motor starts, the injected hydraulic oil can more efficiently push the brake shaft 8 to compress the spring, ensuring that the brake shaft 8 is released smoothly. This improves the response efficiency of the brake shaft 8 and eliminates the need for an additional power source, helping to maintain the system's compactness and aligning with the design that eliminates the external brake cylinder.

[0029] A first sealing ring 17 and a second sealing ring 18 are respectively provided on both sides of the power chamber 10. The first sealing ring 17 and the second sealing ring 18 on both sides of the power chamber 10 can effectively prevent hydraulic oil leakage, ensure the pressure of the power chamber 10 is stable, ensure the reliable operation of the brake shaft 8 under the action of hydraulic oil, reduce oil loss and contamination, and improve the stability and service life of the system in conjunction with the compact structural design.

[0030] One end of the brake spring 9 is inserted into the spring cavity 19 of the brake shaft 8, and the other end of the brake spring 9 abuts against the side plate 20 of the motor rear cover 4. This arrangement makes the spring force more stable and aligned with the direction of movement of the brake shaft 8, ensuring reliable braking force during parking. Furthermore, the built-in design of the spring eliminates the need for additional space, further reducing the motor size and meeting the lightweighting goal.

[0031] An oil drain channel 21 is provided inside the brake shaft 8, which connects the brake chamber 7 and the insertion chamber 11. The oil drain channel 21 in the brake shaft 8 connects the brake chamber 7 and the insertion chamber 11, which can timely drain excess oil in the chamber, prevent pressure buildup in the closed chamber that could cause abnormal operation of the brake shaft 8, ensure smooth movement of the brake shaft 8 under the action of spring or hydraulic pressure, ensure reliable parking brake and release actions, and improve system stability with a compact structure.

[0032] A locating pin 22 is provided on the brake shaft 8 to prevent the brake shaft 8 from tilting during movement. This avoids misalignment or jamming in the spline meshing of the brake shaft 8 with the distribution shaft 6 and the rotor assembly 2, ensuring the smooth operation of the brake shaft 8, extending the service life of components, and adapting to the overall compact structure, thereby improving the reliability of the braking system.

[0033] The first internal tooth 13 and / or the external tooth 12 are provided with tooth guide surfaces, which enable the external tooth 12 and the first internal tooth 13 to effectively mesh. This guides the brake shaft 8 to smoothly mesh with the spline of the rotor assembly 2, avoiding jamming or damage during meshing, improving the efficiency of parking brake switching, protecting the tooth structure, and enhancing braking performance in conjunction with the design of braking through spline meshing.

[0034] The above provides a detailed description of a hydraulic motor parking brake system provided by this utility model. Specific examples have been used to illustrate the principle and implementation of this utility model. The descriptions of the embodiments are merely for the purpose of helping to understand this utility model and its core ideas. It should be noted that those skilled in the art can make various improvements and modifications to this utility model without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A parking brake system for a hydraulic motor, comprising a stator, a rotor assembly, a front motor cover, and a rear motor cover, wherein the rotor assembly is connected to an output shaft, a distribution shaft is disposed within the rear motor cover, and the output shaft passes through the front motor cover and connects to the outside, characterized in that... The distribution shaft is provided with a braking chamber, and the braking chamber is provided with a brake shaft that can move laterally. The brake shaft is provided with a brake spring. A power chamber is provided between the brake shaft and the distribution shaft. The rotor assembly is provided with an insertion chamber for the brake shaft to be inserted and removed. The brake shaft is provided with external teeth, and the insertion chamber is provided with first internal teeth. When the brake shaft is inserted into the insertion chamber, the external teeth and the first internal teeth mesh. When the hydraulic motor is running, hydraulic oil is injected into the power chamber. The power chamber pushes the brake shaft to squeeze the brake spring and keeps the brake shaft and the insertion chamber in a separated state. When the hydraulic motor is stopped, the injection of hydraulic oil into the power chamber stops. The brake shaft is squeezed by the brake spring and pushed into the insertion chamber. After the external teeth and the first internal teeth mesh, the rotor assembly cannot rotate.

2. The parking brake system of a hydraulic motor according to claim 1, characterized in that... The distribution shaft is provided with a second internal tooth on the inner wall of the braking cavity. The second internal tooth and the external tooth continuously mesh, which plays a lateral guiding role and prevents the braking shaft from rotating relative to the distribution shaft.

3. The parking brake system of a hydraulic motor according to claim 1, characterized in that... The power chamber includes a first side and a second side. The first side is close to the brake spring, and the second side is close to the brake assembly. The area of ​​the first side is larger than the area of ​​the second side.

4. A parking brake system for a hydraulic motor according to claim 3, characterized in that... The power chamber is provided with a first sealing ring and a second sealing ring on both sides.

5. A parking brake system for a hydraulic motor according to claim 1, characterized in that... One end of the brake spring is inserted into the spring cavity of the brake shaft, and the other end of the brake spring abuts against the side plate of the motor rear cover.

6. A parking brake system for a hydraulic motor according to claim 1, characterized in that... The brake shaft is provided with an oil drain channel, which connects the brake chamber and the insertion chamber.

7. A parking brake system for a hydraulic motor according to claim 1, characterized in that... The brake shaft is equipped with a locating pin to prevent it from tilting during movement.

8. A parking brake system for a hydraulic motor according to claim 1, characterized in that... The first internal tooth and / or external tooth are provided with tooth guide surfaces, so that the external tooth and the first internal tooth can effectively bite together.

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