Parking brake clamp device

Abstract

The invention relates to the field of rail transit, in particular to a parking brake clamp device which comprises a parking cylinder, a brake cylinder and a clamping device. The brake cylinder comprises a brake piston, a pushing part, an adjusting assembly, a lead screw and a front body; one side of the brake piston is connected with the parking push rod; one end of the adjusting assembly is connected with the pushing part, and the other end of the adjusting assembly penetrates through the lead screw; the front body can extend out of the brake cylinder in the moving direction perpendicular to the parking push rod. The brake clamp comprises a lever and a brake pad; the other end of the lever is connected with the brake pad; the brake pad is attached to the brake disc during braking. The parking push rod pushes the brake piston to move, the brake piston pushes the pushing part, the adjusting assembly, the lead screw and the front body to move in the direction perpendicular to the moving direction of the parking push rod, the lever is driven to rotate around the shaft, the brake pad is attached to the brake disc, and under the condition that the parking output force is kept unchanged, the brake output force is adjusted; and strong coupling of braking output force and parking output force is overcome.

Description

Technical Field

[0001] This invention belongs to the field of rail transit technology, and in particular relates to a parking brake caliper device. Background Art

[0002] The brake caliper unit is the core actuator of the braking system of rail transit vehicles. A brake caliper unit with parking function must not only realize the functions of normal braking and release, but also have the ability to brake and release while parking.

[0003] Currently, the braking devices installed on trains and trailers have different functions and quantities, but the total braking output force of each type of train must be the same, as must the total parking output force of each type of train. This means that the braking output force and parking output force provided by the braking devices on different types of trains need to be adjusted, with the braking output force needing to be reduced and the parking output force needing to remain unchanged.

[0004] In the existing brake caliper unit structure, there is a strong coupling between the braking output force and the parking output force. Adjusting the braking output force by adjusting the parameters of the brake cylinder results in passive adjustment of the parking output force, which cannot meet the needs of motor vehicles and trailers. Summary of the Invention

[0005] To address the shortcomings of related technologies, this invention provides a parking brake caliper device with optimized structure, enabling independent adjustment of braking output force, ensuring constant parking output force, and solving the problem of strong coupling between braking output force and parking output force.

[0006] This invention provides a parking brake caliper device, including a parking cylinder, a brake cylinder, and a brake caliper; The parking cylinder has a built-in parking push rod, which can extend or retract relative to the parking cylinder. The brake cylinder includes a brake piston, a pusher, an adjustment assembly, a lead screw, and a front body; The brake piston and the pusher are both located inside the brake cylinder. The brake piston includes a disc and a wedge connected to each other. The first side of the disc is connected to the end of the parking push rod, and the first end of the wedge is connected to the second side of the disc. The second end of the wedge contacts the side of the pusher near the brake piston, and the side of the wedge that contacts the pusher is set as an inclined surface. The cross-section of the wedge gradually decreases from the side near the disc to the side away from the disc. The side of the second end of the wedge that contacts the brake caliper is set as a surface perpendicular to the disc surface. The adjustment component is connected to the push part at one end near the push part and can be pushed out in a direction perpendicular to the movement direction of the parking push rod. The adjustment component has a built-in lead screw that passes through the end of the adjustment component away from the push part and is fixedly connected to the front body. The front body is connected to the brake caliper, and pushes the lead screw through the push part and the adjustment assembly, causing the front body to extend out of the brake cylinder in a direction perpendicular to the parking push rod; The brake caliper includes symmetrically arranged levers and brake pads; One of the levers is axially connected to the front body at one end near the brake cylinder, another lever is in contact with the surface of the second end of the wedge at one end near the brake cylinder, and another lever is axially connected to the brake cylinder at one end near the push part at one end near the brake cylinder. The ends of the two levers away from the brake cylinder are respectively connected to the brake pads. The two brake pads are arranged opposite each other.

[0007] In some embodiments, the brake cylinder further includes: A brake cylinder body is located between the parking cylinder and the front body, and is connected to the parking cylinder; The piston sleeve is annular, with its outer side fitting the inner side of the parking cylinder and the inner side of the brake cylinder, and its inner side fitting the outer edge of the disc. The middle part between the outer and inner sides is recessed inward.

[0008] In some embodiments, the brake cylinder further includes: The rubber cup is U-shaped, with its outer side connected to the inner side of the piston sleeve and its inner side fitting against the outer edge of the disc.

[0009] In some embodiments, an outer edge extends from the second side of the disk and fits against the piston sleeve; from the first side of the disk to the second side of the disk, the outer side of the disk is stepped and fits against the inner side of the rubber cup.

[0010] In some embodiments, the parking cylinder further includes: An intermediate body is located between the parking cylinder and the brake cylinder, with one end near the brake cylinder connected to the brake cylinder body. A circular hole is provided in the center of the intermediate body, through which the parking push rod passes.

[0011] In some embodiments, the brake cylinder further includes: The sealing rings are annular and connect the brake cylinder body, the intermediate body, and the piston sleeve, respectively.

[0012] In some embodiments, the parking cylinder further includes: The cylinder head is placed and connected to the end of the intermediate body away from the brake cylinder; A parking piston is located between the parking cylinder head and the intermediate body, and the parking push rod passes through the center of the parking piston; A parking spring is located between the parking cylinder head and the parking piston.

[0013] In some embodiments, the parking push rod has a first groove on its surface, the parking piston has a second groove on its surface, and the parking cylinder further includes: When the parking push rod is not extended, the steel ball is located in the first groove of the parking push rod. When the parking cylinder is extended, the steel ball moves towards the second groove of the parking piston, with part of the steel ball located in the first groove and part of the steel ball located in the second groove.

[0014] In some embodiments, the brake caliper further includes: A brake pad support pin connects to the end of the lever furthest from the brake cylinder and is axially connected to the lever. The brake pad support has the brake pad support pin and the brake pad connected to its two sides respectively.

[0015] In some embodiments, the brake caliper further includes a mounting bracket and a pivot, the mounting bracket being connected to the lever on its inner side and to the vehicle frame on its outer side, and the pivot extending through the middle of the lever and the mounting bracket.

[0016] Based on the above technical solution, the present invention provides a parking brake caliper device, which optimizes the device structure, ensures that the device's external dimensions remain unchanged, solves the problem of strong coupling between the values ​​of braking output force and parking output force, ensures that the parking brake output force remains unchanged, and adjusts the braking output force only according to needs. Attached Figure Description

[0017] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings: Figure 1 This is a schematic diagram of one embodiment of a parking brake caliper device according to the present invention; Figure 2 This is a schematic diagram of one embodiment of a parking brake caliper device according to the present invention; Figure 3 This is a schematic diagram of the piston sleeve in one embodiment of a parking brake caliper device of the present invention; Figure 4 This is a schematic diagram of the piston sleeve in one embodiment of a parking brake caliper device of the present invention; Figure 5This is a schematic diagram of the brake piston structure in one embodiment of a parking brake caliper device according to the present invention; Figure 6 This is an enlarged schematic diagram of structure A of the brake piston in one embodiment of a parking brake caliper device of the present invention; Figure 7 This is a schematic diagram of the brake piston structure in one embodiment of a parking brake caliper device according to the present invention; Figure 8 This is a cross-sectional view of the brake cylinder in one embodiment of a parking clamp device of the present invention.

[0018] In the picture: 1. Cylinder head; 2. Spring; 3. Steel ball; 4. Piston; 5. Push rod; 6. Intermediate body; 7. Brake piston; 701. Disc; 702. Wedge; 8. Piston sleeve; 9. Brake cylinder body; 10. Pushing part; 11. Releasing spring; 12. Adjusting assembly; 13. Front body; 14. Pushing part bearing; 15. Brake bearing; 16. Hinge bolt; 17. Lever; 18. Hanger; 19. Shaft; 20. Brake pad support; 21. Brake pad support pin; 22. Rubber cup; 23. Sealing ring; 24. Brake pad; 25. Lead screw. Detailed Implementation

[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0020] In the description of this invention, it should be understood that the terms "center", "lateral", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0021] The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first," "second," or "third" may explicitly or implicitly include one or more of that feature.

[0022] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0023] The brake caliper unit is the core actuator of the braking system of rail transit vehicles. A brake caliper unit with parking function must not only perform normal braking and release functions, but also have parking braking and parking release capabilities. A brake caliper unit typically includes a brake cylinder, a parking cylinder, and a brake caliper, which are interconnected. Therefore, the compatibility of each component must be comprehensively considered when selecting a model.

[0024] The parking brake relies on an energy storage spring within the parking cylinder. This spring, through a mechanical amplification structure, converts its force into brake pad pressure, thereby applying the brakes. When the parking cylinder is inflated, compressed air pushes a piston to overcome the spring force and release the brakes. When the cylinder is deflated, the spring force pushes a push rod to apply the parking brake, which is then amplified by the brake cylinder and caliper levers and transmitted to the brake pads and brake disc.

[0025] Standard suburban trains impose new requirements on brake caliper units. To achieve lightweight design, the brake caliper units must be compact, with strict limitations on their dimensions and weight. However, this limitation also affects the improvement of parking output force. Suburban trains with a speed of 200 km / h include trailer cars and motor cars. Each axle of the motor car is equipped with two sets of brake caliper units, one of which has a parking function. Each axle of the trailer car is equipped with three sets of brake caliper units, one of which also has a parking function. To simplify the design, the wheel-mounted brake caliper units of the trailer car and motor car must maintain the same dimensions. Furthermore, the total braking output force and parking output force of the three sets of brake caliper units per axle of the trailer car and the two sets of brake caliper units per axle of the motor car must be consistent. After being distributed to the brake caliper units of the trailer car and motor car, the commonly used output forces of the parking-function brake caliper units on the trailer car and the parking-function brake caliper units on the motor car differ, but the parking output force must be consistent. This necessitates adjustments to both the braking output force and the parking output force.

[0026] The parking output force is provided by the energy storage spring, and its magnitude is fixed. However, after being amplified by the brake cylinder and caliper lever, the final parking output force transmitted to the brake disc is affected by the braking ratio. To balance the braking output forces of the trailer and the motor, the braking output force of the trailer needs to be reduced, for example, by adjusting the lever ratio or piston ratio, but the parking output force may decrease accordingly.

[0027] Existing technologies typically alter braking output force by adjusting the lever ratio and brake cylinder piston ratio parameters. However, this can negatively impact the efficiency of stopping force transmission, leading to insufficient or excessive stopping braking force. Furthermore, due to the stringent requirements on the size of brake caliper units in urban rail transit systems, matching force values ​​within dimensional constraints is difficult, making traditional methods of increasing spring force or lever ratio unsuitable. This results in poor braking matching between trailers and motor cars.

[0028] To address the aforementioned issues, this application provides a parking brake caliper device. While maintaining the same external dimensions, it optimizes the brake cylinder structure to achieve independent adjustment of the braking output force, while ensuring that the parking output force remains unaffected. This avoids the force imbalance problem caused by parameter coupling in traditional technologies, providing a more efficient and reliable braking device for urban rail transit systems.

[0029] As attached Figure 1 As shown in an illustrative embodiment of the parking brake caliper device of the present invention, the parking brake caliper device is used for the service braking and parking braking of a vehicle, and acts on the brake disc or brake shaft, including a parking cylinder, a brake cylinder and a brake caliper.

[0030] The parking cylinder has a built-in parking push rod 5, which can extend or retract relative to the parking cylinder, and its end is connected to the brake cylinder.

[0031] The brake cylinder includes a brake piston 7, a pusher 10, a release spring 11, an adjustment assembly 12, and a front body 13.

[0032] The brake piston 7 and the pusher 10 are both located inside the brake cylinder. The brake piston 7 includes a disc 701 and a wedge 702 connected to each other. The first side of the disc 701 is connected to the end of the parking push rod 5. The first end of the wedge 702 is connected to the second side of the disc 701. The second end of the wedge 702 contacts the side of the pusher 10 near the brake piston, and the side that contacts the pusher 10 is set as an inclined surface. The cross-section of the wedge 702 gradually decreases from the side near the disc 701 to the side away from the disc 701. The side that contacts the brake caliper at the second end of the wedge 702 is set as a surface perpendicular to the disc surface of the disc 701.

[0033] In the wedge 702, the cross-section of the end connected to the disk 701 is larger than the cross-section of the end connected to the pusher 10.

[0034] like Figure 8 As shown, the end of the adjustment assembly 12 near the push part 10 is connected to the push part 10 and can be pushed out in a direction perpendicular to the movement of the parking push rod 5. The adjustment assembly 12 has a built-in lead screw 25, which passes through the end of the adjustment assembly 12 away from the push part 10 and is fixedly connected to the front body 13.

[0035] The brake cylinder has a channel inside that is perpendicular to the direction of movement of the parking push rod 5, and the adjustment component 12 is located inside the channel.

[0036] The relief spring 11 is located on the side of the push part 10 away from the brake piston 7, and the relief spring 11 is mounted on the adjustment assembly 12.

[0037] The front body 13 is connected to the brake caliper. The pusher 10 and the adjustment assembly 12 push the lead screw 25, which drives the front body 13 to extend out of the brake cylinder in a direction perpendicular to the parking push rod 5.

[0038] The brake caliper includes symmetrically arranged levers 17 and brake pads 24.

[0039] One lever 17 is connected to the front body 13 at one end near the brake cylinder, the other lever 17 is in contact with the second end of the wedge 702 at one end near the brake cylinder, and the other lever is connected to the brake cylinder at one end near the push part. The two levers 17 are connected to the brake pad 24 at the ends away from the brake cylinder.

[0040] The other lever 17 is connected to the brake cylinder via a brake bearing 15.

[0041] Two brake pads 24 are positioned opposite each other and fit against the brake disc during braking.

[0042] The braking function is achieved through the coordinated operation of the parking cylinder, brake cylinder, and brake caliper. When parking brake is applied, the parking push rod 5 in the parking cylinder extends, pushing the brake piston 7 in the brake cylinder to move. The wedge portion 702 of the brake piston 7 uses its inclined surface to push the pusher portion 10 in a direction perpendicular to the movement of the parking push rod 5. The pusher portion 10 pushes the lead screw 25 through the adjusting assembly 12, transmitting the force to the front body 13. The front body 13 extends in a direction perpendicular to the movement of the parking push rod 5, simultaneously pushing the corresponding lever 17 in the brake caliper through a horizontal surface. Since the two levers 17 are respectively axially connected to the front body 13 and the brake cylinder, they rotate around their axes under the action of force, causing the brake pads 24 at their ends to move closer together and engage with the brake disc to complete braking. When parking brake is released, the parking push rod 5 retracts, the release spring 11 resets, pushing the pusher portion 10, causing the brake piston 7 to retract, the levers 17 to reset, and the brake pads 24 to separate from the brake disc.

[0043] Furthermore, as the brake piston 7 is pushed by the parking push rod 5, the brake cylinder connected to the other lever 17 moves in the opposite direction to the movement of the front body 13, causing the other lever 17 to move around the axis, so that the brake pad 24 on the other lever 17 approaches the brake disc or brake shaft, thereby achieving braking.

[0044] It achieves effective braking and release of the vehicle's brake disc, integrates a parking cylinder and a brake cylinder, has a compact structure, and can convert axial force into rotational force of lever 17 through the special structure of the wedge 702, resulting in high braking efficiency. The symmetrical design of lever 17 and brake pad 24 ensures uniform force distribution during braking, improving braking stability.

[0045] In some embodiments, the parking cylinder further includes: The intermediate body 6 is located between the parking cylinder and the brake cylinder, and is connected to the brake cylinder. A round hole is provided in the center, through which the parking push rod 5 passes.

[0046] The parking push rod 5 is guided by the round hole of the intermediate body 6, ensuring that the parking push rod 5 moves in a straight line during the extension or retraction process, avoiding deviation, improving the accuracy of the movement of the parking push rod 5, reducing component wear caused by push rod deviation, ensuring the stability of force transmission between the parking cylinder and the brake cylinder, and extending the service life of the device.

[0047] Furthermore, the end of the intermediate body 6 near the brake cylinder is connected to the brake cylinder body 9.

[0048] In some embodiments, such as Figure 2 , 3 As shown, the brake cylinder also includes: Brake cylinder 9 is located between parking cylinder and front body 13 and is connected to parking cylinder.

[0049] Piston sleeve 8 is annular, with its outer side fitting the inner side of intermediate body 6 and brake cylinder body 9. A sealing ring 23 is provided at the connection, and its inner side fits the outer edge of rubber cup 22 to achieve dynamic sealing. The middle part between the outer and inner sides is recessed inward.

[0050] The brake cylinder body 9 is connected to the intermediate body 6, forming the external frame of the brake cylinder. The outer side of the piston sleeve 8 fits against the inner side of the intermediate body 6 and the inner side of the brake cylinder body 9, while the inner side fits against the outer side of the rubber cup 22. The rubber cup 22 and the outer edge of the disc 701 of the brake piston 7 are press-fitted together. Its concave structure cooperates with the convex structure of the brake cylinder to ensure the stability of the device, while also playing a sealing and guiding role, ensuring that the brake piston 7 moves stably within the brake cylinder.

[0051] The connection between the brake cylinder body 9 and the intermediate body 6 enhances the overall structural strength of the device. The design of the piston sleeve 8 not only ensures the sealing of the brake cylinder, but also provides precise guidance for the brake piston 7, thereby improving the reliability of the brake cylinder operation.

[0052] Specifically, the piston sleeve 8 is recessed inward at one end near the intermediate body 6 to form a limiting step, and a ventilation groove is provided on the end face of the piston sleeve 8 near the intermediate body 6 to accelerate air circulation.

[0053] Furthermore, such as Figure 4As shown, the piston sleeve 8 can be provided with a protrusion at the middle position on the outer side, and the highest point of the protrusion fits against the inner side of the brake cylinder body 9 and the inner side of the intermediate body 6.

[0054] In some embodiments, the brake cylinder further includes: The sealing ring 23 is annular and connects the brake cylinder body 9, the intermediate body 6 and the piston sleeve 8 respectively.

[0055] The sealing ring 23 connects the brake cylinder body 9, the intermediate body 6 and the piston sleeve 8 respectively, forming a sealing barrier at the connection point of the three, improving the sealing performance, reducing the wear of internal components caused by impurities, ensuring the long-term stable operation of the brake cylinder and improving the safety of the device.

[0056] In some embodiments, the brake cylinder further includes: The rubber cup 22 is U-shaped, with the piston sleeve 8 connected to the outside and the outer edge of the disc 701 connected to the inside.

[0057] The U-shaped rubber cup 22 is connected to the piston sleeve 8 on the outside and to the disc 701 of the brake piston 7 on the inside. During the movement of the brake piston 7, the cup deforms and always maintains a tight fit with both, thus playing a sealing role.

[0058] This design further enhances the sealing performance of the brake cylinder, ensuring stable pressure within the cylinder and guaranteeing that the brake piston 7 can effectively transmit force, thereby improving braking reliability and sensitivity. The U-shaped structure also provides good deformation capability, allowing it to adapt to frequent movements of the brake piston 7.

[0059] In some embodiments, such as Figures 5-7 As shown, an outer edge extends from the second side of the disk 701, and the outer edge fits against the piston sleeve 8. From the first side of the disk 701 to the second side, the outer side of the disk 701 is stepped and fits against the inner side of the rubber cup 22. From the first side of the disk 701 to the second side, the diameter of the cross-section of the disk 701 gradually decreases.

[0060] The stepped structure extending from the second side of the disc 701 and the periphery increases the contact area between the disc 701 and the piston sleeve 8 and the rubber cup 22. During the movement of the brake piston 7, it can better withstand and transmit force. At the same time, after the disc 701 and the rubber cup 22 are press-fitted together, the stepped structure can better fit the rubber cup 22 and prevent the rubber cup 22 from coming off.

[0061] The structural strength of the brake piston 7 has been enhanced, improving the stability and reliability of force transmission. The stepped structure facilitates the installation and fixation of components, thus improving the stability of the device assembly.

[0062] In some embodiments, the parking cylinder further includes: Place cylinder head 1 and connect intermediate body 6 to the end away from brake cylinder.

[0063] The parking piston 4 is located between the parking cylinder head 1 and the intermediate body 6, and the parking push rod 5 passes through the center of the parking piston 4.

[0064] The parking spring 2 is located between the parking cylinder head 1 and the parking piston 4.

[0065] The parking cylinder head 1 and the intermediate body 6 are connected to form a closed space for the parking cylinder. The parking piston 4 moves between the parking cylinder head 1 and the intermediate body 6, and the parking spring 2 is located between the two. When parking brake is applied, the parking spring 2 extends and pushes the parking piston 4, which in turn drives the parking push rod 5 to extend. When the brake is released, the air pressure overcomes the spring force and pushes the parking piston 4 to compress the parking spring 2, causing the parking push rod 5 to retract.

[0066] The parking spring 2 provides braking force, enabling parking braking when there is no external power, thus improving vehicle safety. The parking cylinder head 1 ensures the sealing of the parking cylinder interior, providing a stable working environment for the parking spring 2 and the parking piston 4.

[0067] In some embodiments, the surface of the parking push rod 5 is provided with a first groove, the surface of the parking piston 4 is provided with a second groove, and the parking cylinder further includes: When the parking push rod 5 is not extended, the steel ball 3 is located in the first groove of the parking push rod 5. When the parking cylinder is extended, the steel ball 3 moves to the second groove of the parking piston 4, with part of the steel ball 3 located in the first groove and part of the steel ball 3 located in the second groove.

[0068] When the parking push rod 5 is not extended, the steel ball 3 is located in the first groove of the parking push rod 5, and the two are relatively fixed. When the parking cylinder is extended, as the parking push rod 5 moves, the steel ball 3 moves to the second groove of the parking piston 4, partly located in the first groove and partly located in the second groove. Through the locking action of the steel ball 3, the force is transmitted to ensure the effective transmission of force between the parking push rod 5 and the parking piston 4.

[0069] This enhances the stability of the connection between the parking push rod 5 and the parking piston 4 and the reliability of force transmission, preventing slippage or interruption of force transmission during relative movement and ensuring the normal operation of the parking braking function.

[0070] In some embodiments, the brake caliper further includes: Brake pad support pin 21 connects to the end of lever 17 away from the brake cylinder and is axially connected to lever 17.

[0071] The brake pad support 20 is connected to the brake pad support pin 21 and the brake pad 24 on both sides respectively.

[0072] The brake pad support pin 21 is axially connected to the lever 17, allowing the brake pad support 20 to rotate around the brake pad support pin 21. The brake pad support 20 is connected to the brake pad 24. During braking, the lever 17 drives the brake pad support pin 21 and the brake pad support 20 to move, so that the brake pad 24 fits against the brake disc. Since the brake pad support 20 can rotate, it can ensure that the brake pad 24 fits well against the brake disc.

[0073] The improved fit between the brake pad 24 and the brake disc ensures better braking performance. The brake pad support 20 and brake pad support pin 21 make the installation and replacement of the brake pad 24 more convenient and reduce maintenance costs.

[0074] In some embodiments, the brake caliper further includes a mounting bracket 18 and a pivot 19, with the inner side of the mounting bracket 18 connected to the lever 17 and the outer side connected to the vehicle frame, and the pivot 19 passing through the middle of the lever 17 and the mounting bracket 18.

[0075] The pivot 19 passes through the middle of the lever 17 and the hanger 18, allowing the lever 17 to rotate around the pivot 19. The outer side of the hanger 18 is connected to the vehicle frame to fix the brake caliper to the vehicle, and the inner side is connected to the lever 17 to provide a support point for the lever 17.

[0076] This achieves a stable connection between the brake caliper and the vehicle, provides a stable rotation support point for lever 17, ensures the stability and reliability of lever 17's movement during braking, and improves the overall installation firmness of the braking device.

[0077] When performing regular braking, the brake cylinder is filled with compressed air, which pushes the brake piston 7 to move. The wedge 702 of the brake piston 7 pushes the pusher 10 to move in a direction perpendicular to the movement of the brake piston 7, causing the brake cylinder to extend. The brake cylinder pushes the lever 17 to rotate around the hanger 18 and the shaft 19 through the hinge bolt 16. The two brake pad supports 20 push the brake pads 24 to press against the brake disc to achieve braking.

[0078] This application also provides an adjustment method for a parking brake caliper device, applicable to the aforementioned parking brake caliper device. The adjustment method includes: adjusting the area of ​​the disc 701. Based on the calculation formulas for braking output force and parking output force, the adjusted braking output force and the unchanged parking output force are obtained according to the area of ​​the disc 701. The structure of the piston sleeve 8 and the rubber cup 22 is adjusted to ensure that the disc 701 remains sealed after adjustment.

[0079] Specifically, the parking brake caliper device achieves dual amplification through the wedge 702 and lever 17, wherein the calculation formula for the amplification factor of the wedge inside the brake cylinder is as follows: ,in, The wedge angle is 702. The formula for calculating the brake caliper lever ratio is: ,in, The projection of the center of the rotating shaft 19 onto the straight line connecting the center of the hinge bolt 16 and the center of the shaft in the brake pad support pin 21, is the distance from the center of the hinge bolt 16. The projection of the center of the rotating shaft 19 onto the straight line connecting the center of the hinge bolt 16 and the center of the shaft in the brake pad support pin 21, is the distance from the center of the shaft in the brake pad support pin 21.

[0080] The formula for calculating braking output force is: Where P is the air pressure and S is the area of ​​the disc 701 in the piston. For the brake cylinder transmission efficiency, f is the spring force for releasing the brake. This is to improve the efficiency of lever transmission.

[0081] After the parking cylinder is vented, the parking spring 2 pushes the parking piston 4 to move. The parking piston 4, through the steel ball 3, drives the parking push rod 5 to extend. The parking push rod 5 pushes the brake piston 7 to move. The parking force is transmitted to the brake pad 24 through the wedge 702, the pusher 10, and the lever 17 to achieve parking braking. Since the driving force is the parking spring 2, the pushing force of the parking push rod 5 is a stable value and cannot be adjusted. The parking force is also a stable value due to the amplification factor of the wedge and the lever. The formula for calculating the parking output force is as follows: ,in, The thrust for parking push rod 5.

[0082] When the compressed air is kept constant, reducing the braking output force can be achieved by reducing the area of ​​the disc 701 in the piston, thus reducing only the braking output force while keeping the parking output force unchanged. The disc 701 cooperates with the piston sleeve 8, and the overall dimensions of the device can remain unchanged.

[0083] Taking a suburban train with a speed of 200 km / h as an example, the design calculations are based on the following: each axle of the EMU is equipped with two sets of brake caliper units, one of which has a parking function; each axle of the trailer is equipped with three sets of brake caliper units, one of which has a parking function. The diameter of the brake cylinder of the EMU parking brake caliper device is 203 mm, the thrust of the parking cylinder push rod 5 is 20 kN, the wedge magnification ratio is 2.7, the lever ratio is 1.5, the brake cylinder efficiency is 0.96, the release spring force is 0.8 kN, the lever transmission efficiency is 0.98, and the thrust of the parking push rod 5 is 10 kN. According to the calculation formula of braking output force, when the air pressure is 420 kPa, the braking output force of the EMU is 50.59 kN. According to the calculation formula of parking output force, the parking output force of the EMU is 36.93 kN. With three sets of brake caliper devices installed on each axle of the trailer, when the air pressure is 420 kPa, the braking output force of each parking brake caliper device is 50.59 × 2 / 3 = 33.73 kN. According to the formula for calculating the braking output force, the diameter of the piston disc 701 can be calculated to be 166.7 mm. With the piston wedge magnification and lever magnification remaining unchanged, the parking output force of the trailer remains unchanged at 36.93 kN.

[0084] This invention reduces the commonly used braking output force while keeping the parking output force constant, the brake cylinder and lever ratios unchanged, and the device's external interface unchanged by changing the area of ​​the disc 701 of the brake cylinder piston. This allows for independent adjustment of the braking output force.

[0085] Finally, it should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0086] The above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of the present invention or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solutions of the present invention, and all such modifications and substitutions should be covered within the scope of the technical solutions claimed in the present invention.

Claims

1. A parking brake caliper device, characterized in that, This includes the parking cylinder, brake cylinder, and brake caliper; The parking cylinder has a built-in parking push rod, which can extend or retract relative to the parking cylinder. The brake cylinder includes a brake piston, a pusher, an adjustment assembly, and a front body; The brake piston and the pusher are both located inside the brake cylinder. The brake piston includes a disc and a wedge connected to each other. A first side of the disc is connected to the end of the parking push rod, and a first end of the wedge is connected to a second side of the disc. The second end of the wedge contacts the side of the pusher near the brake piston, and the side of the wedge in contact with the pusher is set as an inclined surface. The cross-section of the wedge gradually decreases from the side near the disc to the side away from the disc. The side of the second end of the wedge in contact with the brake caliper is set as a surface perpendicular to the disc surface. The adjustment component is connected to the push part at one end near the push part and can be pushed out in a direction perpendicular to the movement direction of the parking push rod. The adjustment component has a built-in lead screw that passes through the end of the adjustment component away from the push part and is fixedly connected to the front body. The front body is connected to the brake caliper, and pushes the lead screw through the push part and the adjustment assembly, causing the front body to extend out of the brake cylinder in a direction perpendicular to the parking push rod; The brake caliper includes symmetrically arranged levers and brake pads; One of the levers is axially connected to the front body at one end near the brake cylinder, another lever is in contact with the surface of the second end of the wedge at one end near the brake cylinder, and another lever is axially connected to the brake cylinder at one end near the push part at one end near the brake cylinder. The ends of the two levers away from the brake cylinder are respectively connected to the brake pads. The two brake pads are arranged opposite each other.

2. The parking brake caliper device according to claim 2, characterized in that, The brake cylinder also includes: A brake cylinder body is located between the parking cylinder and the front body, and is connected to the parking cylinder; The piston sleeve is annular, with its outer side fitting the inner side of the parking cylinder and the inner side of the brake cylinder, and its inner side fitting the outer edge of the disc. The middle part between the outer and inner sides is recessed inward.

3. The parking brake caliper device according to claim 2, characterized in that, The brake cylinder also includes: The rubber cup is U-shaped, with its outer side connected to the inner side of the piston sleeve and its inner side fitting against the outer edge of the disc.

4. The parking brake caliper device according to claim 3, characterized in that, An outer edge extends from the second side of the disc and fits against the piston sleeve; from the first side of the disc to the second side of the disc, the outer side of the disc is stepped and fits against the inner side of the rubber cup.

5. The parking brake caliper device according to claim 2, characterized in that, The parking cylinder also includes: An intermediate body is located between the parking cylinder and the brake cylinder, with one end near the brake cylinder connected to the brake cylinder body. A circular hole is provided in the center of the intermediate body, through which the parking push rod passes.

6. The parking brake caliper device according to claim 5, characterized in that, The brake cylinder also includes: The sealing rings are annular and connect the brake cylinder body, the intermediate body, and the piston sleeve, respectively.

7. The parking brake caliper device according to claim 2, characterized in that, The parking cylinder also includes: The cylinder head is placed and connected to the end of the intermediate body away from the brake cylinder; A parking piston is located between the parking cylinder head and the intermediate body, and the parking push rod passes through the center of the parking piston; A parking spring is located between the parking cylinder head and the parking piston.

8. The parking brake caliper device according to claim 7, characterized in that, The surface of the parking push rod is provided with a first groove, the surface of the parking piston is provided with a second groove, and the parking cylinder further includes: When the parking push rod is not extended, the steel ball is located in the first groove of the parking push rod. When the parking cylinder is extended, the steel ball moves towards the second groove of the parking piston, with part of the steel ball located in the first groove and part of the steel ball located in the second groove.

9. The parking brake caliper device according to claim 1, characterized in that, The brake caliper also includes: A brake pad support pin connects to the end of the lever furthest from the brake cylinder and is axially connected to the lever. The brake pad support has the brake pad support pin and the brake pad connected to its two sides respectively.

10. The parking brake caliper device according to claim 1, characterized in that, The brake caliper also includes a mounting bracket and a pivot. The inner side of the mounting bracket is connected to the lever, and the outer side is connected to the vehicle frame. The pivot passes through the middle of the lever and the mounting bracket.

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