Electromechanical parking brake device

Abstract

The invention relates to an electromechanical parking brake device, which relates to the technical field of rail transit vehicles, and comprises a shell, a push rod, a lead screw assembly, a spring set, an end cover and a locking assembly, one end of the push rod is located in the shell and slides in the shell, the other end of the push rod penetrates out of the shell, and the end cover is arranged on the side, away from the push rod, of the shell and connected with the shell. The lead screw assembly is arranged in the shell, one end of the lead screw assembly abuts against the push rod, and the other end of the lead screw assembly penetrates out of the end cover and is connected with the locking assembly. The spring set is arranged in the shell, one end of the spring set abuts against the push rod and the lead screw assembly, and the other end of the spring set abuts against the end cover. Electric energy is effectively converted into mechanical energy through rotation of the lead screw assembly, efficient energy storage and release are achieved through energy storage of the compression spring set, brake application of the push rod is efficiently achieved, brake application work does not need to depend on a power source, and safety is high.

Description

Technical Field

[0001] The present application relates to the field of rail transit vehicle technology, and in particular to an electromechanical parking brake device. Background Art

[0002] With the rapid development of rail vehicle technology, modern rail transit has continuously increased the requirements for the electrification of the braking system. As the core basic execution unit in the rail transit system, the simplification of the design and improvement of the safety of the electromechanical brake device have become an important task for the development of the industry.

[0003] Although the existing electromechanical parking brake device has gotten rid of the dependence on compressed air and hydraulic oil, it also has the following shortcomings: 1) The current electromechanical brake device usually relies on the rotation of the motor to apply the brake. Although this method effectively converts electrical energy into mechanical energy, there is a certain amount of energy loss during the transmission process, resulting in low transmission efficiency; 2) The electromechanical brake device is highly dependent on the power supply during the braking process. In the event of a power failure or power outage, the brake system cannot complete the application of the parking brake, which causes serious safety hazards; 3) The existing electromechanical brake device relies on the electrical mechanism to directly lock the brake spring, which places high requirements on the performance of the locking mechanism. However, in the existing device, the overall stability of the locking mechanism is poor and is easily affected by changes in the external environment, which may cause the device to fail and affect the safe operation of the train; 4) During the release of the parking brake, the electromechanical brake device needs to cooperate with the control circuit to ensure the smooth release of the brake. However, the complex control logic and high dependence on electrical components in the existing design make the system design and debugging process more difficult and increase the risk of failure.

[0004] In summary, although electromechanical brake devices have made important technological progress, they still face many challenges in terms of transmission efficiency, power supply dependence, locking mechanism performance, and control system complexity. Therefore, in-depth research and innovation in these areas are urgently needed to improve the overall performance, safety, and reliability of electromechanical brake devices. Summary of the invention

[0005] The present application provides an electromechanical parking brake device to solve the problems raised in the above background technology.

[0006] The present application provides an electromechanical parking brake device that adopts the following technical solution: An electromechanical parking brake device comprises a housing, a push rod, a lead screw assembly, a spring group, an end cover and a locking assembly; one end of the push rod is located in the housing and slides in the housing, and the other end passes through the housing, and the end cover is arranged on a side of the housing away from the push rod and connected to the housing; the lead screw assembly is arranged in the housing, one end of the lead screw assembly abuts against the push rod, and the other end passes through the end cover and is connected to the locking assembly; the spring group is arranged in the housing, one end of the spring group abuts against the push rod and the lead screw assembly, and the other end abuts against the end cover; The locking assembly is used to control the rotation direction of the screw assembly; the screw assembly is used to apply pressure to the spring group; the spring group is used to push the push rod out to achieve braking.

[0007] By adopting the above technical solution, when it is necessary to apply the brake, the locking assembly drives the screw assembly to rotate in the direction of the spring group storing energy, and causes the push rod to move inward. The rotation of the screw assembly and the movement of the push rod will compress the spring group, and the spring group will store energy. After the energy storage is completed, the locking assembly drives the screw assembly to rotate in the opposite direction. At this time, the compression force of the spring group will act on the push rod, and finally push it out, so that the braking device enters the working state and generates sufficient braking force to lock the train. The device of the present application has a simple structure, reduces complex mechanical components, reduces the probability of failure, and is easy to maintain and overhaul. The device of the present application utilizes the rotation of the screw assembly to effectively convert electrical energy into Mechanical energy is stored by compressing the spring group to achieve efficient energy storage and release. Due to the connection between the screw assembly and the push rod, the response speed of the entire braking process is fast, and the brakes can be applied or released in a short time, thereby improving safety. In addition, the locking assembly can ensure that the screw assembly will not rotate accidentally when the brakes are not required, thereby enhancing the safety of the braking system. The design of the spring group ensures that the push rod always remains in the braking position in the braking state to prevent misoperation. The electromechanical brake device can be appropriately adjusted according to different train types and operating environments, such as the stiffness of the spring and the rotation speed of the screw, so that it can adapt to braking requirements under various conditions.

[0008] In a specific possible implementation scheme, the screw assembly includes a ball screw and a ball nut, one end of the ball nut abuts the push rod, and the other end is threadedly connected to the ball screw, one end of the ball screw away from the ball nut passes through the end cover and is connected to the locking assembly, and the spring group abuts the ball nut.

[0009] By adopting the above technical solution, the combination of the ball screw and the ball nut provides low-friction movement, which makes the conversion of rotation into linear motion more efficient. This efficient energy conversion makes the process of energy storage and braking faster, and the design of the ball screw reduces the friction during movement, making the entire operation process smoother, reducing mechanical wear and increasing the service life of the device; in addition, the structural design of the ball screw and ball nut also makes the device easy to disassemble and repair, reducing maintenance costs and improving operating efficiency.

[0010] In a specific feasible implementation scheme, the locking assembly includes a ratchet, a locking rod, a rotary stop, a connecting rod group and an electromagnetic device, the ratchet is connected to the end of the ball screw, one end of the locking rod is rotationally connected to the rotary stop, the other end of the locking rod is fixedly arranged, the connecting rod group is rotationally connected to the two ends of the locking rod respectively, and the connecting rod group is movably arranged; the electromagnetic device is used to control the opening and closing of the movement of the connecting rod group, the movement of the connecting rod group will drive the locking rod and the rotary stop to move, the rotary stop is in contact with the ratchet and is used to limit the rotation direction of the ratchet.

[0011] By adopting the above technical solution, the automatic locking of the ratchet by the rotary stop is achieved through the movement of the electromagnetically controlled connecting rod group. The interaction between the ratchet and the rotary stop effectively prevents the ratchet from accidentally rotating in the locked state, thereby avoiding loss of control of the mechanical system. The flexible connection between the various components of the locking assembly allows a wider range of movement, providing a flexible locking solution for complex mechanical systems. The locking assembly is compactly designed, which helps save space and is suitable for various applications.

[0012] In a specific possible implementation manner, a torsion spring is provided between the locking rod and the rotation stop, and the torsion spring is used for resetting the rotation stop.

[0013] By adopting the above technical solution, the torsion spring can automatically reset the rotation stop to its initial position after the locking state is released, ensuring that the system can quickly return to the ready state. The automatic reset function reduces the need for operator intervention and improves the safety and convenience of operation.

[0014] In a specific possible implementation scheme, the electromagnetic device includes a valve core and a reset spring. The valve core is movably connected to the connecting rod group. The electromagnetic device controls the movement of the connecting rod group by attracting the valve core. The reset spring is used to reset the valve core.

[0015] By adopting the above technical solution, the valve core is controlled by electromagnetic suction, and its position change directly affects the movement state of the connecting rod group. The movement of the connecting rod group is realized by the displacement of the valve core, thereby completing a specific mechanical function. The reset spring is used to quickly restore the valve core to its initial position after the electromagnetic suction is released, thereby ensuring the stability and reliability of the system.

[0016] In a specific feasible implementation scheme, in the locked state, the electromagnetic device is energized to attract the valve core, and the valve core drives the connecting rod group and the locking rod to form the first and second locking positions, and the rotation stop abuts against the ratchet to limit the rotation direction of the ratchet; when the spring group stores energy, the ratchet rotates to drive the rotation stop to rotate, and the rotation of the ratchet drives the ball screw to rotate, thereby driving the ball nut to move and compressing the spring. After the ratchet stops rotating, the rotation stop is reset under the action of the torsion spring, completing the energy storage of the spring group; in the unlocked state, the electromagnetic device loses power, and the valve core is reset under the action of the reset spring, destroying the first and second locking positions, and the connecting rod group drives the locking rod and the rotation stop to rotate, and the rotation stop and the ratchet are released from the abutment relationship, the ratchet rotates in the opposite direction, driving the ball screw to rotate in the opposite direction, and the spring group pushes the push rod out to complete the braking application.

[0017] By adopting the above technical solution, the valve core is controlled by the electromagnetic device, which can effectively fix the connecting rod group and the locking rod in the first and second locking positions, ensuring that the equipment will not move accidentally in the locked state, thereby enhancing the safety of the system. The application of the electromagnetic device makes the entire locking and unlocking process automated, reduces manual intervention, and improves the convenience and efficiency of operation.

[0018] In a specific feasible implementation scheme, the connecting rod group includes a first connecting rod, a second connecting rod, a third connecting rod, and a fourth connecting rod. The end of the locking rod close to the rotation stop is connected to the first connecting rod, the end of the first connecting rod away from the locking rod is connected to the second connecting rod and connected to the third connecting rod, the end of the second connecting rod away from the first connecting rod is fixedly arranged, the end of the third connecting rod away from the first connecting rod is connected to the fourth connecting rod, the end of the fourth connecting rod away from the third connecting rod is connected to the end of the locking rod away from the rotation stop, and the valve core is arranged at the connection between the third connecting rod and the fourth connecting rod.

[0019] In a specific feasible implementation scheme, when the electromagnetic device is energized, the valve core is attracted, the first connecting rod and the second connecting rod are arranged in the same direction, the third connecting rod and the fourth connecting rod are arranged in the same direction, the locking rod, the first connecting rod, the third connecting rod, and the fourth connecting rod form a triangular structure, and form the first and second locking positions; when the electromagnetic device loses power, the valve core is reset, and an angle is formed between the first connecting rod and the second connecting rod, and between the third connecting rod and the fourth connecting rod, thereby destroying the first and second locking positions.

[0020] By adopting the above technical scheme, in the locked state, the locking rod and the first connecting rod, the third connecting rod and the fourth connecting rod together form a triangular structure, which ensures that the system remains stable between the first and second locking positions to prevent accidental movement, thereby realizing the restriction of the rotation direction of the ratchet by the locking rod and the rotary stop; in the unlocked state, the relative positions between the first connecting rod and the second connecting rod and between the third connecting rod and the fourth connecting rod change to form an angle, which breaks the previous triangular structure, releases the first and second locking positions, and allows further movement of the connecting rod group, thereby driving the locking rod and the rotary stop to move, and releasing the abutment relationship between the rotary stop and the ratchet; this scheme realizes an efficient and safe locking and unlocking mechanism through a reasonable connecting rod layout and electromagnetic locking design, has good stability and adaptability, and is suitable for the application requirements of various automation and intelligent equipment. The design of the system not only improves the convenience of operation, but also effectively enhances the safety and reliability of the equipment.

[0021] In a specific possible implementation manner, the ball screw is fixed in the end cover via an end bearing.

[0022] By adopting the above technical solution, the ball screw is fixed in the end cover by using the end bearing, which ensures that the screw remains stable during rotation and movement, prevents excessive axial or radial displacement, and can reduce the friction between the ball screw and the fixed end, which helps to improve movement efficiency, reduce energy consumption, and extend service life; the end bearing can also withstand the load generated by the ball screw during work, including axial load and radial load, ensuring stable operation of the equipment under various working conditions.

[0023] In a specific possible implementation manner, a stopper is provided on a side of the housing away from the end cover, and the stopper is used to prevent the push rod from moving out of the housing.

[0024] By adopting the above technical solution, the setting of the stop portion can effectively limit the stroke of the push rod, preventing it from being completely moved out of the shell during operation, reducing damage caused by the push rod falling off or misoperation, thereby extending the service life of the device, reducing maintenance costs, and providing reliable protection for the long-term use of the device.

[0025] In a specific possible implementation manner, the outer wall of the push rod abuts against the inner wall of the shell, and the push rod slides along the inner wall of the shell to abut against it.

[0026] By adopting the above technical solution, the abutment between the outer wall of the push rod and the inner wall of the shell provides a guiding function, so that the push rod can slide along a predetermined track when working, ensuring the stability and directionality of its movement.

[0027] In a specific possible implementation manner, a groove is provided on the outer wall of the push rod on the side in contact with the shell.

[0028] By adopting the above technical solution and utilizing the groove design, the contact area between the push rod and the housing can be reduced, thereby reducing friction, thereby preventing heat accumulation due to excessive friction, reducing wear, and extending the service life of the equipment; and the presence of the groove can reduce the use of materials, thereby reducing the weight of the push rod, and helping to improve the overall performance and energy efficiency of the equipment; the groove design can also form a certain buffer area between the push rod and the housing, reducing the noise and vibration generated during movement.

[0029] In a specific possible implementation manner, a sealing member is provided on the side of the push rod in contact with the housing.

[0030] By adopting the above technical solution, the seal can prevent dust, impurities and moisture from entering the interior of the device, protect the push rod and other key components, prevent corrosion and wear, and extend the service life of the equipment; and the seal can absorb impact and vibration to a certain extent, enhance the stability of the push rod during operation, and avoid failures caused by vibration.

[0031] In summary, the present application includes at least one of the following beneficial technical effects: the device of the present application utilizes the rotation of the lead screw assembly to effectively convert electrical energy into mechanical energy, stores energy by compressing the spring group, and realizes efficient energy storage and release, and due to the connection between the lead screw assembly and the push rod, the response speed of the entire braking process is fast, and the brake can be applied or released in a short time, thereby improving safety; The device of the present application forms the first and second locking positions by using the dead point design of the mechanism between the connecting rod group and the locking rod, so that the electromagnetic device only needs to overcome the return spring force of the electromagnetic device to lock the brake spring group, thereby reducing the performance requirements for the electrical components; During the parking brake release process, there is no need for control circuit cooperation, and the electromagnetic device can remain in a normally energized state, thereby simplifying the complexity of the control system; when the electromagnetic device loses power, it will automatically trigger the application of the brake, thereby improving the safety of the brake device, and the brake spring force of the spring group can directly act on the actuator push rod, reducing intermediate transmission relief and improving transmission efficiency; when the electromagnetic device loses power, it will automatically trigger the application of the brake, thereby improving the safety of the brake device; the present application uses ball screws and nuts to release elastic potential energy, thereby reducing the impact force of the brake application and making the brake application process smoother. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the structure of the electromechanical parking brake device according to an embodiment of the present application.

[0033] Figure 2 It is a schematic diagram for showing the structure of the locking assembly.

[0034] Figure 3 It is a simplified diagram used to show the locking components in various states.

[0035] Figure 4 It is a schematic diagram for showing the structure of the push rod and the housing.

[0036] Explanation of the accompanying drawings: 1. Housing; 2. Push rod; 3. Ball screw; 4. Ball nut; 5. Spring group; 6. End cover; 7. Locking assembly; 71. Ratchet; 72. Locking rod; 73. Rotation stop; 74. Torsion spring; 75. First connecting rod; 76. Second connecting rod; 77. Third connecting rod; 78. Fourth connecting rod; 79. Valve core; 8. Groove; 9. Seal; 10. Stop portion. DETAILED DESCRIPTION

[0037] The following is combined with Figure 1-4 This application is described in further detail.

[0038] Reference Figure 1 , the embodiment of the present application discloses an electromechanical parking brake device, including but not limited to a power-off triggered electromechanical parking brake device, the electromechanical parking brake device including but not limited to the parking brake work applied to rail trains; The electromechanical parking brake device comprises a housing 1, a push rod 2, a screw assembly, a spring assembly 5, an end cover 6 and a locking assembly 7; in this embodiment, the housing 1 is arranged horizontally, one end of the push rod 2 is located in the housing 1 and slides in the housing 1, and the other end passes through the housing 1. In this embodiment, the push rod 2 moves in the horizontal direction; the end cover 6 is arranged on a side of the housing 1 away from the push rod 2, and is fixedly connected to the housing 1; The lead screw assembly is arranged in the housing 1, one end of the lead screw assembly abuts against the push rod 2, and the other end passes through the end cover 6 and is connected to the locking assembly 7. In this embodiment, the lead screw assembly is arranged horizontally and moves in the horizontal direction; the spring group 5 is arranged in the housing 1, one end of the spring group 5 abuts against the push rod 2 and the lead screw assembly, and the other end abuts against the end cover 6; The locking assembly 7 is used to control the rotation direction of the screw assembly; the screw assembly is used to apply pressure to the spring assembly 5; the spring assembly 5 is used to push the push rod 2 out to achieve braking; When working, the electromechanical parking brake device is in an initial state, the push rod 2 is not in the working position, the spring group 5 is in a natural state, the locking assembly 7 is not activated, and the screw assembly is in a static state; When the brake needs to be applied, the locking assembly 7 is activated, and the locking assembly 7 drives the screw assembly to rotate in the direction of the spring group 5 storing energy, and causes the push rod 2 to move inward. The rotation of the screw assembly and the movement of the push rod 2 will compress the spring group 5, and the spring group 5 will store energy. After the energy storage is completed, the locking assembly 7 changes its operation and drives the screw assembly to rotate in the opposite direction. At this time, the compression force of the spring group 5 will act on the push rod 2, and finally push it out, so that the brake device enters the working state, generating sufficient braking force to lock the train; When the brake needs to be released, the operator or the control system activates the locking assembly 7 again, drives the screw assembly to rotate in the energy storage direction, gradually releases the pressure of the spring group 5, and the push rod 2 returns to the initial position. In this way, the brake device is released and the train can run safely.

[0039] Reference Figure 1 and Figure 2 The screw assembly includes a ball screw 3 and a ball nut 4. One end of the ball nut 4 abuts against the push rod 2. In this embodiment, the push rod 2 is provided with a mounting surface for mounting the ball nut 4. The other end of the ball nut 4 is threadedly connected with the ball screw 3. One end of the ball screw 3 away from the ball nut 4 passes through the end cover 6 and is connected to the locking assembly 7. In this embodiment, the axis of the ball screw 3, the center line of the ball nut 4, and the center line of the push rod 2 are collinearly arranged. The ball screw 3 is fixed in the end cover 6 through the end bearing, so as to ensure that the ball screw 3 remains stable during rotation and movement, prevent excessive axial or radial displacement, and reduce the friction between the ball screw 3 and the fixed end, which helps to improve the movement efficiency, reduce energy consumption, and extend the service life; the end bearing can also withstand the load generated by the ball screw 3 during operation, including axial load and radial load, to ensure the stable operation of the equipment under various working conditions; One end of the spring group 5 abuts against the ball nut 4 and the push rod 2, and the other end abuts against the end cover 6. In this embodiment, the spring group 5 includes two springs. Two energy storage chambers are formed between the push rod 2, the ball nut 4 and the end cover 6. The two springs are on both sides of the ball screw 3 and are installed in the energy storage chamber. The combination of the ball screw 3 and the ball nut 4 provides low-friction movement, making the conversion of rotation into linear motion more efficient. This efficient energy conversion makes the process of energy storage and braking faster, and the design of the ball screw 3 reduces the friction during movement, making the entire operation process smoother, reducing mechanical wear and increasing the service life of the device.

[0040] The locking assembly 7 includes a ratchet 71, a locking rod 72, a rotation stop 73, a connecting rod group and an electromagnetic device. The ratchet 71 is fixedly connected to one end of the ball screw 3 passing through the end cover 6. In the present embodiment, the ratchet 71 is provided with a through hole, and one end of the ball screw 3 passing through the end cover 6 is inserted into the through hole and fixedly connected to the ratchet 71; one end of the locking rod 72 is rotationally connected to the rotation stop 73, and the other end of the locking rod 72 is fixedly arranged. In the present embodiment, one end of the locking rod 72 is rotationally connected to the rotation stop 73 through a movable hinge, and the other end of the locking rod 72 is fixed by a fixed hinge, and the fixed hinge is fixedly arranged, and the locking rod 72 is rotationally connected to the fixed hinge; A torsion spring 74 is provided between the locking rod 72 and the rotation stop 73, and the torsion spring 74 is used to reset the rotation stop 73; the torsion spring 74 can automatically reset the rotation stop 73 to the initial position after the locking state is released, so as to ensure that the system can quickly return to the ready state. The automatic reset function reduces the need for operator intervention and improves the safety and convenience of operation. The connecting rod group is rotatably connected to the two ends of the locking rod 72 respectively, and the connecting rod group is movably arranged; the electromagnetic device is used to control the opening and closing of the movement of the connecting rod group, and the movement of the connecting rod group will drive the locking rod 72 and the rotation stopper 73 to move, and the rotation stopper 73 contacts the ratchet 71 and is used to limit the rotation direction of the ratchet 71. In this embodiment, the contact surface between the rotation stopper 73 and the ratchet 71 is set to be a plane; The ratchet 71 is automatically locked by the rotary stop 73 through the movement of the electromagnetically controlled connecting rod group. The interaction between the ratchet 71 and the rotary stop 73 effectively prevents the ratchet 71 from accidentally rotating in the locked state, thereby avoiding the loss of control of the mechanical system. The flexible connection between the various components of the locking assembly 7 allows a wider range of movement, providing a flexible locking solution for complex mechanical systems. The locking assembly 7 is compactly designed to help save space and is suitable for various applications.

[0041] The electromagnetic device includes a valve core 79 and a reset spring. In this embodiment, the valve core 79 is connected to the connecting rod group through a movable hinge. The electromagnetic device controls the movement of the connecting rod group by sucking the valve core 79. In this process, the valve core 79 is controlled by electromagnetic suction, and its position change directly affects the movement state of the connecting rod group. The movement of the connecting rod group is achieved by the displacement of the valve core 79, thereby completing a specific mechanical function; the reset spring is used to reset the valve core 79, so that it can quickly return to the initial position after the electromagnetic device is released from electromagnetic suction, ensuring the stability and reliability of the system; Reference Figure 2 and Figure 3 , Figure 3 The state a is the locked state. In the locked state, the electromagnetic device is energized, and the valve core 79 is electromagnetically attracted. The valve core 79 drives the connecting rod group and the locking rod 72 to form the first and second locking positions. The rotation stopper 73 abuts against the ratchet 71 to limit the rotation and rotation direction of the ratchet 71. Figure 3 The middle c state is the energy storage state of the spring group 5. When the spring group 5 is accumulating energy, the ratchet 71 rotates to drive the rotation stop 73 to rotate. When the ratchet 71 rotates, the ball screw 3 is driven to rotate, thereby driving the ball nut 4 to move and compress the spring. After the ratchet 71 stops rotating, the rotation stop 73 is reset under the action of the torsion spring 74, completing the energy storage of the spring group 5. Figure 3 The middle b state is the unlocked state. In the unlocked state, the electromagnetic device loses power, the electromagnetic attraction is released, the valve core 79 is reset under the action of the reset spring, the first and second locking positions are destroyed, the connecting rod group drives the locking rod 72 and the rotating stopper 73 to rotate, the rotating stopper 73 and the ratchet 71 are released from the abutment relationship, the ratchet 71 rotates in the opposite direction, drives the ball screw 3 to rotate in the opposite direction, and the spring group 5 pushes the push rod 2 out to complete the braking; By utilizing the dead point design of the mechanism between the connecting rod assembly and the locking rod 72 to form the first and second locking positions, the electromagnetic device only needs to overcome the return spring force of the electromagnetic device to lock the brake spring assembly 5, thereby reducing the performance requirements for electrical components.

[0042] Reference Figure 2 and Figure 3The connecting rod group includes a first connecting rod 75, a second connecting rod 76, a third connecting rod 77, and a fourth connecting rod 78. In the present embodiment, one end of the locking rod 72 close to the rotation stop 73 is rotationally connected to the first connecting rod 75 through a movable hinge; one end of the first connecting rod 75 away from the locking rod 72 is rotationally connected to the second connecting rod 76 through a movable hinge, and is rotationally connected to the third connecting rod 77 through a movable hinge; one end of the second connecting rod 76 away from the first connecting rod 75 is fixedly arranged. In the present embodiment, the second connecting rod 76 is fixed by a fixed hinge, and the second connecting rod 76 is rotationally connected to the fixed hinge; one end of the third connecting rod 77 away from the first connecting rod 75 is rotationally connected to the fourth connecting rod 78 through a movable hinge, and one end of the fourth connecting rod 78 away from the third connecting rod 77 is connected to one end of the locking rod 72 away from the rotation stop 73. In the present embodiment, the fourth connecting rod 78 and the rotation stop 73 are both rotationally connected to the fixed hinge, and the valve core 79 is provided at the connection between the third connecting rod 77 and the fourth connecting rod 78; Reference Figure 2 and Figure 3 , Figure 3 The state a is the locked state, the electromagnetic device is energized, and the valve core 79 is electromagnetically attracted. At this time, the first connecting rod 75 and the second connecting rod 76 are arranged in the same direction, and the third connecting rod 77 and the fourth connecting rod 78 are arranged in the same direction. The locking rod 72, the first connecting rod 75, the third connecting rod 77, and the fourth connecting rod 78 form a triangular structure, and form the first and second locking positions; in the locked state, the locking rod 72 and the first connecting rod 75, the third connecting rod 77, and the fourth connecting rod 78 together form a triangular structure, which ensures that the system remains stable between the first and second locking positions to prevent accidental movement, thereby realizing the restriction of the rotation direction of the ratchet 71 by the locking rod 72 and the rotation stop 73; Figure 3 The middle b state is the unlocked state, the electromagnetic device loses power, the electromagnetic attraction is released, the valve core 79 is reset, and an angle is formed between the first link 75 and the second link 76, and between the third link 77 and the fourth link 78, thereby destroying the first and second locking positions; in the unlocked state, the relative positions between the first link 75 and the second link 76, and between the third link 77 and the fourth link 78 change, forming an angle, which breaks the previous triangular structure, releases the first and second locking positions, and allows the link group to move further, thereby driving the locking rod 72 and the rotation stop 73 to move, and releasing the abutment relationship between the rotation stop 73 and the ratchet 71; This solution realizes an efficient and safe locking and unlocking mechanism through a reasonable connecting rod layout and electromagnetic locking design. It has good stability and adaptability and is suitable for the application needs of various automation and intelligent equipment. The design of this system not only improves the convenience of operation, but also effectively enhances the safety and reliability of the equipment.

[0043] Reference Figure 4A stopper 10 is provided on one side of the housing 1 away from the end cover 6, and the stopper 10 is used to prevent the push rod 2 from moving out of the housing 1; the setting of the stopper 10 can effectively limit the stroke of the push rod 2, prevent it from completely moving out of the housing 1 during operation, reduce the damage caused by the push rod 2 falling off or misoperation, thereby extending the service life of the device, reducing maintenance costs, and providing reliable protection for the long-term use of the device; The outer wall of the push rod 2 abuts against the inner wall of the shell 1, and the push rod 2 slides and abuts against the inner wall of the shell 1; during braking, the abutment between the outer wall of the push rod 2 and the inner wall of the shell 1 provides a guiding function, so that the push rod 2 can slide along a predetermined trajectory during operation, ensuring the stability and directionality of its movement.

[0044] A groove 8 is provided on the outer wall of the side where the push rod 2 contacts the shell 1; the design of the groove 8 can reduce the contact area between the push rod 2 and the shell 1, thereby reducing friction, thereby preventing heat accumulation due to excessive friction, reducing wear, and extending the service life of the equipment; and the groove 8 can accommodate the displacement caused by processing or assembly errors, so that the push rod 2 can better adapt to the shape changes of the shell 1 during movement, thereby improving the stability and accuracy of operation; the design of the groove 8 can also form a certain buffer area between the push rod 2 and the shell 1, reducing the noise and vibration generated during the movement; in this embodiment, the groove 8 can also serve as a storage area or channel for lubricant, helping the lubricant to be better distributed on the contact surface, ensuring the smoothness of the push rod 2 during movement, and reducing friction and wear.

[0045] A seal 9 is provided on the side where the push rod 2 contacts the housing 1. In the present embodiment, the seal 9 includes but is not limited to a sealing ring, which is arranged along the circumference of the push rod 2. The seal 9 can prevent dust, impurities and moisture from entering the interior of the device, protect the push rod 2 and other key components, prevent corrosion and wear, and extend the service life of the equipment. The seal 9 can absorb shock and vibration to a certain extent, enhance the stability of the push rod 2 during operation, and avoid failures caused by vibration. In the present embodiment, the seal 9 can also prevent the leakage of lubricating oil, liquid or gas, ensure that the internal medium is not contaminated by the outside, and avoid the loss of the internal medium.

[0046] The implementation principle of the embodiment of the present application is as follows: the device of the present application utilizes the rotation of the lead screw assembly to effectively convert electrical energy into mechanical energy, stores energy by compressing the spring group 5, and realizes efficient energy storage and release. Moreover, due to the connection between the lead screw assembly and the push rod 2, the response speed of the entire braking process is fast, and the brake can be applied or released in a short time, thereby improving safety. When working, the electromechanical parking brake device is in an initial state, the push rod 2 is not in the working position, the spring group 5 is in a natural state, the locking assembly 7 is not activated, and the screw assembly is in a static state; When the brake needs to be applied, the electromagnetic device is energized, and the valve core 79 is electromagnetically attracted, and the valve core 79 drives the connecting rod group to move. At this time, the locking rod 72, the first connecting rod 75, the third connecting rod 77, and the fourth connecting rod 78 form a triangular structure, and the connecting rod group and the locking rod 72 form the first and second locking positions. The rotation stop 73 abuts against the ratchet 71 to limit the rotation and rotation direction of the ratchet 71; when the spring group 5 stores energy, the ratchet 71 rotates to drive the rotation stop 73 to rotate, and when the ratchet 71 rotates, it drives the ball screw 3 to rotate, thereby driving the ball nut 4 to move, compressing the spring, and after the ratchet 71 stops rotating, the rotation stop 73 is reset under the action of the torsion spring 74, completing the energy storage of the spring group 5; After the energy storage is completed, the electromagnetic device loses power, the electromagnetic attraction is released, and the valve core 79 is reset under the action of the reset spring, thereby driving the connecting rod group to move. At this time, the relative positions between the first connecting rod 75 and the second connecting rod 76 and between the third connecting rod 77 and the fourth connecting rod 78 change, forming an angle. This angle breaks the previous triangular structure, releases the first and second locking positions, and allows further movement of the connecting rod group, thereby driving the locking rod 72 and the rotating stop 73 to move, and releasing the abutment relationship between the rotating stop 73 and the ratchet 71; at this time, the ratchet 71 rotates in the opposite direction, driving the ball screw 3 to rotate in the opposite direction, and the compression force of the spring group 5 will act on the push rod 2, eventually pushing it out, so that the braking device enters the working state, generating sufficient braking force to lock the train; When the brake needs to be released, the operator or the control system activates the locking assembly 7 again, drives the screw assembly to rotate in the energy storage direction, gradually releases the pressure of the spring group 5, and the push rod 2 returns to the initial position. In this way, the brake device is released and the train can run safely. The device of the present application does not require the cooperation of the control circuit during the brake relief process, and the electromagnetic device can remain in a normally energized state, thereby simplifying the complexity of the control system. When the electromagnetic device loses power, it will automatically trigger the application of the brake, thereby improving the safety of the brake device. The brake spring force of the spring group 5 can directly act on the actuator push rod 2, reducing intermediate transmission relief and improving transmission efficiency. When the electromagnetic device loses power, it will automatically trigger the application of the brake, thereby improving the safety of the brake device. The present application uses a ball screw 3 and a nut to release elastic potential energy, thereby reducing the impact force of the brake application and making the brake application process smoother.

[0047] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An electromechanical parking brake device, characterized in that: The invention comprises a housing (1), a push rod (2), a screw assembly, a spring group (5), an end cover (6) and a locking assembly (7); one end of the push rod (2) is located in the housing (1) and slides in the housing (1), and the other end passes through the housing (1); the end cover (6) is arranged on a side of the housing (1) away from the push rod (2) and is connected to the housing (1); the screw assembly is arranged in the housing (1), one end of the screw assembly abuts against the push rod (2), The other end passes through the end cover (6) and is connected to the locking assembly (7); the spring group (5) is arranged in the housing (1), one end of the spring group (5) abuts against the push rod (2) and the screw assembly, and the other end abuts against the end cover (6); the locking assembly (7) is used to control the rotation direction of the screw assembly; the screw assembly is used to apply pressure to the spring group (5); the spring group (5) is used to push the push rod (2) out to achieve braking.

2. The electromechanical parking brake device according to claim 1, characterized in that: The screw assembly comprises a ball screw (3) and a ball nut (4); one end of the ball nut (4) abuts against the push rod (2), and the other end is threadedly connected to the ball screw (3); one end of the ball screw (3) away from the ball nut (4) passes through the end cover (6) and is connected to the locking assembly (7); and the spring assembly (5) abuts against the ball nut (4).

3. The electromechanical parking brake device according to claim 2, characterized in that: The locking assembly (7) comprises a ratchet (71), a locking rod (72), a rotation stop (73), a connecting rod group and an electromagnetic device; the ratchet (71) is connected to the end of the ball screw (3); one end of the locking rod (72) is rotationally connected to the rotation stop (73); the other end of the locking rod (72) is fixedly arranged; the connecting rod group is rotationally connected to the two ends of the locking rod (72) respectively; the connecting rod group is movably arranged; the electromagnetic device is used to control the opening and closing of the movement of the connecting rod group; the movement of the connecting rod group drives the locking rod (72) and the rotation stop (73) to move; the rotation stop (73) contacts the ratchet (71) and is used to limit the rotation direction of the ratchet (71).

4. The electromechanical parking brake device according to claim 3, characterized in that: A torsion spring (74) is provided between the locking rod (72) and the rotation stop (73), and the torsion spring (74) is used to reset the rotation stop (73).

5. The electromechanical parking brake device according to claim 4, characterized in that: The electromagnetic device comprises a valve core (79) and a reset spring. The valve core (79) is movably connected to the connecting rod group. The electromagnetic device controls the movement of the connecting rod group by attracting the valve core (79). The reset spring is used to reset the valve core (79).

6. The electromechanical parking brake device according to claim 5, characterized in that: In the locked state, the electromagnetic device is energized to attract the valve core (79), and the valve core (79) drives the connecting rod group and the locking rod (72) to form the first and second locking positions, and the rotation stop (73) abuts against the ratchet (71) to limit the rotation direction of the ratchet (71); when the spring group (5) stores energy, the ratchet (71) rotates to drive the rotation stop (73) to rotate, and when the ratchet (71) rotates, it drives the ball screw (3) to rotate, thereby driving the ball nut (4) to move and compressing the spring. After the ratchet (71) stops rotating, the The rotation stop (73) is reset under the action of the torsion spring (74), completing the energy storage of the spring group (5); in the unlocked state, the electromagnetic device loses power, the valve core (79) is reset under the action of the reset spring, destroying the first and second locking positions, the connecting rod group drives the locking rod (72) and the rotation stop (73) to rotate, the rotation stop (73) and the ratchet (71) are released from the abutment relationship, the ratchet (71) rotates in the opposite direction, driving the ball screw (3) to rotate in the opposite direction, and the spring group (5) pushes the push rod (2) out, completing the application of the brake.

7. The electromechanical parking brake device according to claim 6, characterized in that: The connecting rod group comprises a first connecting rod (75), a second connecting rod (76), a third connecting rod (77), and a fourth connecting rod (78); an end of the locking rod (72) close to the rotation stop (73) is connected to the first connecting rod (75); an end of the first connecting rod (75) away from the locking rod (72) is connected to the second connecting rod (76) and connected to the third connecting rod (77); an end of the second connecting rod (76) away from the first connecting rod (75) is fixedly arranged; an end of the third connecting rod (77) away from the first connecting rod (75) is connected to the fourth connecting rod (78); an end of the fourth connecting rod (78) away from the third connecting rod (77) is connected to an end of the locking rod (72) away from the rotation stop (73); and the valve core (79) is arranged at the connection between the third connecting rod (77) and the fourth connecting rod (78).

8. The electromechanical parking brake device according to claim 7, characterized in that: When the electromagnetic device is energized, the valve core (79) is attracted, the first connecting rod (75) and the second connecting rod (76) are arranged in the same direction, the third connecting rod (77) and the fourth connecting rod (78) are arranged in the same direction, and the locking rod (72), the first connecting rod (75), the third connecting rod (77) and the fourth connecting rod (78) form a triangular structure, and form the first and second locking positions; when the electromagnetic device is de-energized, the valve core (79) is reset, and an angle is formed between the first connecting rod (75) and the second connecting rod (76), and between the third connecting rod (77) and the fourth connecting rod (78), thereby destroying the first and second locking positions.

9. The electromechanical parking brake device according to claim 2, characterized in that: The ball screw (3) is fixed in the end cover (6) via an end bearing.

10. The electromechanical parking brake device according to claim 1, characterized in that: A stopper (10) is provided on a side of the housing (1) away from the end cover (6), and the stopper (10) is used to prevent the push rod (2) from moving out of the housing (1).

11. The electromechanical parking brake device according to claim 1, characterized in that: The outer wall of the push rod (2) abuts against the inner wall of the shell (1), and the push rod (2) slides along the inner wall of the shell (1) to abut against it.

12. The electromechanical parking brake device according to claim 1, characterized in that: A groove (8) is provided on the outer wall of the push rod (2) on the side in contact with the housing (1).

13. The electromechanical parking brake device according to claim 1, characterized in that: A sealing member (9) is provided on the side of the push rod (2) that contacts the housing (1).

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