Railway vehicle brake cylinder

Abstract

The utility model relates to brake cylinder technical field discloses a kind of for rail transit vehicle brake cylinder, including cylinder body.The utility model technical scheme first passes through sealing piston by piston rod from bottom to top, until the installation block of piston rod bottom end and limit slot complete engagement, rectangular limit slot can directly limit the rotary motion of piston rod relative to sealing piston, guarantee connection coaxality, then sealing piston and installation block are fixed by bolt, and the assembly of both is integrated, while the sealing groove in sealing piston can realize the installation of sealing ring, sealing ring is closely attached to piston rod outer wall, avoid the gap between piston rod and sealing piston, effectively improve the sealing of both, prevent compressed air leakage in cylinder body, when needing to replace piston rod, only bolt is unscrewed, then piston rod is extracted along sealing piston axis direction and separated, without replacing whole, reduce the use cost of equipment maintenance.

Description

Technical Field

[0001] This utility model relates to the field of brake cylinder technology, specifically a brake cylinder for rail transit vehicles. Background Technology

[0002] The brake cylinder is a core actuator in a vehicle braking system. It converts pressure energy (compressed air or hydraulic energy) into mechanical linear motion, driving the basic braking device to generate braking force and enabling the vehicle to decelerate, stop, or park. It is widely used in rail transit, road transport, and other fields. In rail transit vehicles, the brake cylinder is one of the key devices ensuring driving safety, directly affecting the train's braking response speed, braking force stability, and operational efficiency.

[0003] In order to meet the impact force transmission requirements during the braking process, the existing brake cylinders typically use a welded or integrally molded design for the internal sealed piston and piston rod. However, when the piston rod bends or deforms due to long-term wear, the sealed piston and piston rod need to be disassembled and replaced as a whole assembly, which increases the cost of use. Therefore, there is a need for a brake cylinder for rail transit vehicles. Summary of the Invention

[0004] The purpose of this invention is to provide a brake cylinder for rail transit vehicles, which solves the problems mentioned in the background art.

[0005] This application provides a brake cylinder for rail transit vehicles, including a cylinder body. A sealing piston is slidably disposed inside the cylinder body. A limiting groove is formed at the bottom end of the sealing piston. The limiting groove is a rectangular groove. An mounting block is engaged inside the limiting groove. A bolt is threaded through the mounting block and threadedly connected to the sealing piston. A piston rod is fixedly connected to one end of the mounting block facing the sealing piston. The piston rod passes through the sealing piston to the outside of the cylinder body. A sealing groove is formed inside the sealing piston. A sealing ring is engaged inside the sealing groove.

[0006] In use, first pass the piston rod through the sealing piston from bottom to top until the mounting block at the bottom of the piston rod engages with the limiting groove. The rectangular limiting groove directly restricts the rotational movement of the piston rod relative to the sealing piston, ensuring coaxiality of the connection. Then, fix the sealing piston and the mounting block with bolts to complete the assembly. At the same time, the sealing groove inside the sealing piston allows for the installation of the sealing ring. The sealing ring fits tightly against the outer wall of the piston rod, preventing gaps between the piston rod and the sealing piston, effectively improving the sealing performance and preventing compressed air leakage from the cylinder. When the piston rod needs to be replaced, simply unscrew the bolts and pull the piston rod out along the axis of the sealing piston; there is no need to replace the entire unit. The air inlet allows compressed air to enter the cylinder, and the connecting hole guides the compressed air entering from the air inlet into a straight upward direction, ensuring that the compressed air acts perpendicularly on the force-bearing surface of the sealing piston. When the air intake inside the cylinder stops, the spring, under its own elasticity, can drive the sealing piston to quickly return to its original position.

[0007] Optionally, a base is fixedly connected to the bottom end of the cylinder body, and the base has mounting holes.

[0008] The adoption of the above technical solution facilitates the installation of the cylinder block.

[0009] Optionally, a spring is fixedly connected between the top end of the sealing piston and the inner top end of the cylinder, and the spring is sleeved on the outside of the piston rod.

[0010] By adopting the above technical solution, when the air intake inside the cylinder stops, the spring can drive the sealed piston to quickly return to its original position under its own elasticity.

[0011] Optionally, an air inlet is fixedly connected to one side of the outer wall of the cylinder, and a connecting hole is provided at the bottom of the inside of the cylinder, which is connected to the air inlet.

[0012] By adopting the above technical solution, the connection hole can guide the compressed air entering from the air inlet into compressed air in a straight upward direction, ensuring that the compressed air can act perpendicularly on the force-bearing surface of the sealing piston.

[0013] Optionally, two bolts are provided, and the two bolts are arranged symmetrically on the left and right.

[0014] By adopting the above technical solution, the stability of the mounting block installation is further improved.

[0015] Optionally, the length and width of the sealing groove of the limiting groove are adapted to the length and width of the mounting block, the groove depth of the limiting groove is 2cm, and the thickness of the mounting block is 1.5cm.

[0016] By adopting the above technical solution, the mounting block can be installed in a concealed manner, avoiding the bottom end face of the mounting block from protruding from the bottom end face of the sealing piston.

[0017] Optionally, the sealing ring is an O-ring, and the diameter of the sealing ring is adapted to the diameter of the piston rod.

[0018] By adopting the above technical solution, the sealing performance between the piston rod and the sealing piston can be improved, preventing compressed air from leaking out of the gap.

[0019] Optionally, the sealing piston is made of high-strength aluminum alloy.

[0020] By adopting the above technical solutions, the corrosion resistance of the sealed piston can be improved, thereby increasing its service life.

[0021] Compared with the prior art, the beneficial effects of the technical solution of this application are as follows: The technical solution of this application first passes the piston rod through the sealing piston from bottom to top until the mounting block at the bottom of the piston rod engages with the limiting groove. The rectangular limiting groove can directly restrict the rotational movement of the piston rod relative to the sealing piston, ensuring the coaxiality of the connection. Then, the sealing piston and the mounting block are fixed with bolts to complete the assembly of the two. At the same time, the sealing groove inside the sealing piston can realize the installation of the sealing ring. The sealing ring fits tightly against the outer wall of the piston rod, avoiding the formation of gaps between the piston rod and the sealing piston, effectively improving the sealing performance of the two and preventing compressed air leakage in the cylinder. When the piston rod needs to be replaced, simply unscrew the bolts and pull the piston rod out along the axis of the sealing piston to separate it. There is no need to replace the whole unit, reducing the maintenance and use costs of the equipment. Attached Figure Description

[0022] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is a schematic diagram of the overall structure of a brake cylinder for rail transit vehicles according to the present invention. Figure 2 This is a schematic diagram of the internal structure of a brake cylinder for rail transit vehicles according to the present invention; Figure 3 This is a schematic diagram showing the disassembled structure of a sealing piston and mounting block for a brake cylinder of a rail transit vehicle according to the present invention. Figure 4 This is a cross-sectional structural schematic diagram of a sealing piston for a brake cylinder of a rail transit vehicle according to the present invention. In the diagram: 1. Piston rod; 2. Cylinder body; 3. Base; 4. Mounting hole; 5. Air inlet; 6. Connecting hole; 7. Sealing piston; 8. Spring; 9. Limiting groove; 10. Mounting block; 11. Bolt; 12. Sealing groove; 13. Sealing ring. Detailed Implementation

[0023] Please see Figure 1-4 This utility model provides a technical solution: a brake cylinder for rail transit vehicles, including a cylinder body 2, a sealing piston 7 slidably disposed inside the cylinder body 2, a limiting groove 9 formed at the bottom end of the sealing piston 7, the limiting groove 9 being a rectangular groove, an mounting block 10 engaging inside the limiting groove 9, a bolt 11 threaded through the mounting block 10, the bolt 11 being threadedly connected to the sealing piston 7, two bolts 11 being provided in total, the two bolts 11 being symmetrically arranged left and right; further improving the installation firmness of the mounting block 10, a piston rod 1 is fixedly connected to the end of the mounting block 10 facing the sealing piston 7, the mounting block 10 and the piston rod 1 are one The piston rod 1 is formed by integral casting. It passes through the sealing piston 7 to the outside of the cylinder body 2. A spring 8 is fixedly connected between the top of the sealing piston 7 and the top of the inside of the cylinder body 2. The spring 8 is sleeved on the outside of the piston rod 1. When the cylinder body 2 stops intake, the spring 8 can drive the sealing piston 7 to quickly return to its original position under its own elasticity. The sealing piston 7 has a sealing groove 12 inside. A sealing ring 13 is installed inside the sealing groove 12. The sealing ring 13 is an O-ring. The diameter of the sealing ring 13 is matched with the diameter of the piston rod 1. This can improve the sealing performance between the piston rod 1 and the sealing piston 7 and prevent compressed air from leaking from the gap.

[0024] In the technical solution of this utility model, a base 3 is fixedly connected to the bottom end of the cylinder body 2, and an installation hole 4 is provided on the base 3; this facilitates the installation of the cylinder body 2.

[0025] In the technical solution of this utility model, an air inlet 5 is fixedly connected to one side of the outer wall of the cylinder body 2, and a connecting hole 6 is opened at the bottom of the inside of the cylinder body 2. The connecting hole 6 is connected to the air inlet 5. The connecting hole 6 can guide the compressed air entering from the air inlet 5 into compressed air in the upward direction, ensuring that the compressed air can act perpendicularly on the force-bearing surface of the sealing piston 7.

[0026] In the technical solution of this utility model, the length and width of the sealing groove of the limiting groove 9 are adapted to the length and width of the mounting block 10. The groove depth of the limiting groove 9 is 2cm and the thickness of the mounting block 10 is 2cm. This enables the mounting block 10 to be installed in a concealed manner, preventing the bottom end face of the mounting block 10 from protruding from the bottom end face of the sealing piston 7.

[0027] In the technical solution of this utility model, the sealing piston 7 is made of high-strength aluminum alloy; this is beneficial to improving the corrosion resistance of the sealing piston 7, thereby increasing its service life.

[0028] In use, first pass the piston rod 1 through the sealing piston 7 from bottom to top until the mounting block 10 at the bottom of the piston rod 1 engages with the limiting groove 9. The rectangular limiting groove 9 directly restricts the rotational movement of the piston rod 1 relative to the sealing piston 7, ensuring coaxiality of the connection. Then, fix the sealing piston 7 and the mounting block 10 with bolts 11 to complete the assembly. At the same time, the sealing groove 12 inside the sealing piston 7 allows for the installation of the sealing ring 13. The sealing ring 13 fits tightly against the outer wall of the piston rod 1, preventing gaps from forming between the piston rod 1 and the sealing piston 7, effectively... To improve the sealing performance of both components and prevent compressed air leakage inside cylinder 2, when piston rod 1 needs to be replaced, simply unscrew bolt 11 and then pull piston rod 1 out along the axis of sealing piston 7. There is no need to replace the entire unit. Inlet 5 allows compressed air to enter the interior of cylinder 2, and connection hole 6 guides the compressed air entering from inlet 5 into a straight upward direction, ensuring that the compressed air can act perpendicularly on the force-bearing surface of sealing piston 7. When the intake of air into cylinder 2 stops, spring 8 can drive sealing piston 7 to quickly reset under its own elasticity.

Claims

1. A brake cylinder for rail transit vehicles, characterized in that: The cylinder includes a cylinder body (2), inside which a sealing piston (7) is slidably disposed. A limiting groove (9) is opened at the bottom end of the sealing piston (7). The limiting groove (9) is a rectangular groove. An mounting block (10) is engaged inside the limiting groove (9). A bolt (11) is threaded through the mounting block (10). The bolt (11) is threadedly connected to the sealing piston (7). A piston rod (1) is fixedly connected to one end of the mounting block (10) facing the sealing piston (7). The piston rod (1) passes through the sealing piston (7) to the outside of the cylinder body (2). A sealing groove (12) is opened inside the sealing piston (7). A sealing ring (13) is engaged inside the sealing groove (12).

2. A brake cylinder for rail transit vehicles according to claim 1, characterized in that, The bottom end of the cylinder (2) is fixedly connected to a base (3), and the base (3) has a mounting hole (4).

3. A brake cylinder for rail transit vehicles according to claim 1, characterized in that, A spring (8) is fixedly connected between the top end of the sealed piston (7) and the inner top end of the cylinder (2), and the spring (8) is sleeved on the outside of the piston rod (1).

4. A brake cylinder for rail transit vehicles according to claim 1, characterized in that, An air inlet (5) is fixedly connected to one side of the outer wall of the cylinder (2), and a connecting hole (6) is provided at the bottom of the inside of the cylinder (2), which is connected to the air inlet (5).

5. A brake cylinder for rail transit vehicles according to claim 1, characterized in that, There are two bolts (11), which are arranged symmetrically on the left and right.

6. A brake cylinder for rail transit vehicles according to claim 1, characterized in that, The length and width of the sealing groove of the limiting groove (9) are adapted to the length and width of the mounting block (10), the groove depth of the limiting groove (9) is 2cm, and the thickness of the mounting block (10) is 1.5cm.

7. A brake cylinder for rail transit vehicles according to claim 1, characterized in that, The sealing ring (13) is an O-ring, and the diameter of the sealing ring (13) is adapted to the diameter of the piston rod (1).

8. A brake cylinder for rail transit vehicles according to claim 1, characterized in that, The sealing piston (7) is made of high-strength aluminum alloy.

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