Parking brake device for rail transit vehicle and manual mitigation method thereof

A rail transit vehicle, parking braking technology, applied in the direction of brake actuators, gear transmission mechanisms, mechanical equipment, etc., can solve the problems of many parts, high processing and assembly requirements, complex structure, etc., and achieve high reliability and durability High performance, convenient engineering operation, simple and compact structure

Pending Publication Date: 2019-06-04

CRRC CHANGZHOU TECH MARK IND CO LTD +1

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AI-Extracted Technical Summary

Problems solved by technology

[0003] U.S. Patent US2003154854A1 discloses a spring brake cylinder and an emergency release device, which is a typical parking brake device. Various tasks are completed by screwing complex components, etc. The parking brake device operates stably and has high reliability , but the structure is particularly complex, there are many parts, and the processing accuracy is extremely high, and the assembly, disassembly and maintenance are more cumbersome

[0004] The structure of th...

Abstract

The invention discloses a parking brake device for a rail transit vehicle. The parking brake device for the rail transit vehicle includes a cylinder block, a parking piston, a brake lever, a cylinderhead, and a parking spring, wherein the center of the parking piston is provided with a limit cover protruding upwardly; a spline body is arranged on the middle portion of the brake lever; a spline groove is arranged on the top portion of the limit cover; the spline body of the brake lever is in dynamic fit with the limit cover; the upper end of the brake lever penetrates through the spline grooveand extends into a second cavity; a guide seat is fixed at the upper end of the brake lever; the limit cover is sleeved with a brake lever spring; the brake lever is provided with a first rotation position for staggering the spline body and the spline groove of the limit cover, and a second rotating position for matching the spline body with the spline groove of the limit cover; the cylinder headis provided with a rotating disc, a rotating disc spring, a first stop member corresponding to the first rotating position of the brake lever, and a second stop member corresponding to the second rotating position of the brake lever; the rotating disc is connected to the guide seat; and the rotating disc is provided with a radial shifting lever. By means of the parking brake device for the rail transit vehicle, pneumatic mitigation, parking brake and manual mitigation are achieved. The parking brake device for the rail transit vehicle has the advantages of less parts, simple and compact structure, light weight and low manufacturing cost, thereby achieving engineering application conveniently.

Application Domain

Brake actuating mechanismsActuators

Technology Topic

Automotive engineeringCylinder block +4

Image

Examples

Experimental program(2)

Example Embodiment

[0036] Example 1

[0037] see Figure 1 to Figure 14 This embodiment includes a cylinder block 1, a cylinder head 4, a parking piston 5 and a brake rod 6. The parking piston 5 divides the cylinder cavity into a first cavity 1-1 below and a second cavity 1-2 above. The cylinder 1 is provided with an air inlet 1-3 and a brake rod outlet 1-4 corresponding to the first cavity 1-1, and a parking spring 2 is arranged in the second cavity 1-2. The upper end of the parking spring 2 is connected to the cylinder The cover 4 abuts, and the lower end abuts the parking piston 5.

[0038] The center of the parking piston 5 is provided with an upwardly protruding limit cover 5-1, the center of the brake rod 6 is provided with a spline body 6-1, and the teeth of the spline body 6-1 of the brake rod 6 There are at least 4 teeth. In the figure, there are 6 teeth on the spline body 6-1 of the brake lever 6, and the tooth ends are arc-shaped. The top of the limit cover 5-1 is provided with a spline groove 5-1a that matches the spline body 6-1 of the brake lever 6, and the spline body 6-1 of the brake lever 6 and the flower of the limit cover 5-1 The keyway 5-1a is movably matched. The upper end of the brake rod 6 penetrates the limit cover 5-1 and extends to the second cavity 1-2. The upper end is fixed with a guide seat 6-2, the outer diameter of the guide seat 6-2 is larger than The outer diameter of the limit cover 5-1 where the piston 5 is parked. The limit cover 5-1 is sheathed with a brake rod spring 7, one end of the brake rod spring 7 abuts against the guide seat 6-2 of the brake rod 6, and the other end abuts against the parking piston 5.

[0039] The brake lever 6 has a first rotation position in which the spline body 6-1 and the spline groove 5-1a of the limit cover 5-1 are displaced, and the spline body 6-1 and the limit cover 5-1 The spline groove 5-1a coincides with the second rotation position. When the brake lever 6 is in the second rotation position, the brake lever 6 can move up and down along the spline groove 5-1a of the limit cover 5-1 by using the spline body 6-1.

[0040] The cylinder head 4 is provided with a turntable 3, a turntable spring 10, a first stopper 8 corresponding to the first rotation position of the brake lever, and a second stopper 9 corresponding to the second rotation position of the brake lever. The turntable 3 is sleeved on the guide seat 6-2, the guide seat 6-2 is provided with guide keys, the turntable 3 is provided with an axial guide groove that is movably matched with the guide key of the guide seat 6-2, and the brake rod passes through The guide key on the guide seat 6-2 can not only rotate with the turntable 3, but also can move axially along the guide groove of the turntable 3. The turntable 3 has a radial toggle lever 3-1. When the toggle lever 3-1 of the turntable 3 touches the first stop 8, the brake lever 6 is in the first rotation position. When the toggle lever 3- 1 reaches the second stopper 9, and the brake lever 6 rotates to the second rotation position. One end of the turntable spring 10 is connected to the toggle lever 3-1, and the other end is connected to the cylinder head 4. The cylinder head 4 is also provided with a cable 11 for manual relief. A pusher 12 is connected to the bottom end of the cable 11, and the pusher 12 of the cable 11 drives the toggle lever 3-1 to swing. A manual relief spring 13 is sheathed on the cable 11, one end of the manual relief spring 13 is connected to the cylinder head 4, and the other end is connected to the pushing member 12.

[0041] figure 1 , 2 with Picture 12 Shown is the state when the parking brake device is in a state of relief of inflation. Under the action of the turntable spring 10, the toggle lever 3-1 of the turntable 3 abuts the first stop 8, and the brake lever 6 is in the first rotation Position, the compressed air enters the first cavity 1-1 from the air inlet 1-3 of the cylinder, so that the parking piston 5 moves upward against the force of the parking spring 2, and the brake lever 6 acts on the brake lever spring 7. The downward movement also moves upwards, thereby realizing braking relief. Choose a proper inflation pressure so that there is a gap h between the inner top wall 5-1b of the piston limit cover 5-1 and the top surface 6-1a of the brake rod spline body 6-1. The existence of the gap ensures that the brake lever can be smoothly rotated to the first rotation position when it is inflated after manual relief; it is ensured that the brake lever is not subject to the piston force when the inflation is relieved, and the parking brake is completely released.

[0042] image 3 , 4 with Figure 13 Shown is that the parking brake device is in a braking state. In the state of inflated relief, the toggle lever 3-1 of the turntable 3 is in contact with the first stopper 8, and the first cavity 1-1 of the cylinder 1 The gas is discharged, and the parking piston 5 moves downward under the action of the parking spring 2. At this time, the brake rod 6 is in contact with the parking piston 5, that is, the inner top wall 5-1b of the piston limit cover 5-1 and the brake rod The top surface 6-1a of the spline body 6-1 is close to each other, the parking piston 5 takes the brake rod 6 down, and the brake rod 6 extends through the brake rod outlet 1-4 of the cylinder 1, thereby realizing parking braking .

[0043] Figure 5 , 6 with Figure 14 Shown is the state of the parking brake device when it is manually relieved. In the braking state, the parking piston 5 and the brake lever 6 are both in the low position. If manual relief is required, the following method is adopted: Pull the cable 11 to make the turntable 3 The toggle lever 3-1 overcomes the force of the turntable spring 10 and deflects until it abuts against the second stopper 9. In this process, the turntable 3 drives the brake lever 6 to rotate to the second rotation position, and the brake lever 6 The spline body 6-1 is consistent with the spline groove 5-1a on the limit cover 5-1 of the parking piston 5. Because the stored energy of the parking spring 2 is not completely released during the braking process, the parking piston 5 is parked at this time The spring 2 continues to move down to the lowest position, the brake lever 6 moves upward under the action of the brake lever spring 7, and the upper part of the brake lever 6 extends through the spline groove 5-1a on the limit cover 5-1 Out, the brake rod 6 retracts into the cylinder to realize manual relief.

[0044] Figure 7 with Picture 8 As shown, in this embodiment, after manual relief, the cable 11 is released, and the cable 11 returns to the original position under the action of the manual relief spring 13, because the spline body 6-1 is in the spline groove of the limit cover 5-1 In 5-1a, the toggle lever 3-1 cannot return to its original position. At this time, the cylinder needs to be inflated. When compressed air enters the first cavity 1-1 from the air inlet 1-3, the parking piston 5 moves upward along the brake rod 6 until the limit cover 5-1 is free of the spline Body 6-1, the toggle member 3-1 rotates under the action of the turntable spring 10, thereby driving the brake lever 6 to return to the first rotation position, and the entire device is restored to the state when the inflation is relieved. At this time, there is a gap h between the inner top wall 5-1b of the piston limit cover 5-1 and the top surface 6-1a of the brake rod spline body 6-1.

Example Embodiment

[0045] Example 2

[0046] Figure 15 with Figure 16 As shown, the spline body 6-1 of the brake rod 6 of this embodiment is provided with 12 teeth, and the top of the piston limit cover 5-1 is provided with 12 teeth that match the spline body 6-1 of the brake rod 6. A spline groove 5-1a. See Example 1 for others.

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Description & Claims & Application Information

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Parking brake device for rail transit vehicle and manual mitigation method thereof

AI-Extracted Technical Summary

Problems solved by technology

Abstract

Image

Examples

Example Embodiment

Example Embodiment

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Description & Claims & Application Information

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