Load dependent braking pressure regulating device for railway vehicles

• US 6,352,315 B1
• Filed: 12/01/1999
• Issued: 03/05/2002
• Est. Priority Date: 12/02/1998
• Status: Expired due to Fees

• Current Assignee: Yun-Chang Wang, Zhaorong Yin
• Original Assignee: Yun-Chang Wang, Zhaorong Yin
• Inventors: Yin, Zhaorong, Wang, Yun-chang
• Primary Examiner(s): Butler, Douglas C.
• Assistant Examiner(s): TORRES WILLIAMS, MELANIE
• Application Number:
  US09/452,675
• Time in Patent Office: 825 Days
• Field of Search: 303/22.1, 303/9.69, 303/22.5, 303/22.6, 303/22.7, 303/22.8, 105/199.3, 105/201, 188/195
• US Class Current: 303/22.2
• CPC Class Codes: B60T 8/1893 especially adapted for railway vehicles

Abstract

A load dependent braking pressure regulating device for railway vehicles comprises an auxiliary reservoir (8), a brake cylinder (10) and a control valve (9). A regulating valve (2), a sensor valve (4), a triggering board transmission mechanism (5) and a stop disc (6) are provided between the control valve (9) and the brake cylinder (10). A triggering head at the lower end of the stop disc (6) is right opposite the center of the triggering board of said transmission mechanism (5). The sensor valve (4) is connected with the control valve (9), the regulating valve (2), the brake cylinder and the pressure reduction reservoir(7). The device according to the present invention can prevent flat wheel accidents, enhance train operation safety, reduce operation cost and reduce the longitudinal impact between differently loaded cars in a train upon braking.

Claims

1. A load dependent braking pressure regulating device for railway vehicles, comprising an auxiliary reservoir (8) for storing pressurized air from a train pipe;

a brake cylinder (10); and

a control valve (9) operated by means of the pressure difference between the train pipe and the auxiliary reservoir (8) in such a manner that the pressurized air from the auxiliary reservoir (8) enters the brake cylinder (10) through the control valve (9) upon braking and that the pressurized air from the brake cylinder (10) is discharged to the atmosphere through the control valve (9) when the brake cylinder (10) is released, characterized in that a regulating valve (2), a sensor valve (4), a triggering board transmission mechanism (5) and a stop disc (6) are provided between the control valve (9) and the brake cylinder (10), a triggering head provided at the lower end of the stop disc (6) being directly opposite the center of a triggering board (28) of the triggering transmission mechanism (5), and the sensor valve (4) being connected through pipes with the control valve (9), the regulating valve (2), the brake cylinder (10) and a pressure reduction reservoir (7) respectively;

said device being further characterized in that said sensor valve (4) and said stop disc (6) are installed on a support member (3), a round bar (12) extends from the bottom surface of the stop disc (6) into a vertical sleeve of said support member (3) and can move up and down in said sleeve.

2. A load dependent braking pressure regulating device for railway vehicles according to claim 1, characterized in that said sensor valve (4) comprises a control part (49) and a compensation part (50) which are of the same structure, an inlet hole (K1) of said control part (49) being connected with the brake cylinder (10), an outlet hole (K2) of said control part (49) being connected with the regulating valve (2), an inlet hole (B3) of the compensation part (50) being connected with the control valve (9) and an outlet hole (B4) of the compensation part (50) being connected with the pressure reduction reservoir(7).

3. A load dependent braking pressure regulating device for railway vehicles according to claim 2, characterized in that each of said control part (49) and said compensation part (50) of said sensor valve (4) comprises a piston-triggering rod assembly, a compression spring means (59), a valve body (63) and a valve cover (65).

4. A load dependent braking pressure regulating device for railway vehicles according to claim 3, characterized in that the triggering rod (58) of the piston-triggering rod assembly is attached to the piston (56) by inserting a smaller end of the triggering rod (58) into the piston (58) and putting a spring ring (57) into a circumferential groove on the small end of the triggering rod (58), and a check valve (55), a check valve spring (53), a spring seat (52) and a spring ring (51) are provided in sequence on the valve opening of the piston (56).

5. A load dependent braking pressure regulating device for railway vehicles according to claim 1, characterized in that said regulating valve (2) comprises a valve body (71), a check valve (73), a check valve spring (74), a piston (76), a diaphragm (78), and an empty-load indicator.

6. A load dependent braking pressure regulating device for railway vehicles according to claim 5, characterized in that said empty-load indicator comprises a back stop (80), a piston rod (83), a compression spring (84) provided around said piston rod (83) and an indicator member (86) which is driven by said piston rod (83).

7. A load dependent braking pressure regulating device for railway vehicles, comprising an auxiliary reservoir (8) for storing pressurized air from a train pipe;

a brake cylinder (10); and

a control valve (9) operated by means of the pressure difference between the train pipe and the auxiliary reservoir (8) in such a manner that the pressurized air from the auxiliary reservoir (8) enters the brake cylinder (10) through the control valve (9) upon braking and that the pressurized air from the brake cylinder (10) is discharged to the atmosphere through the control valve (9) when the brake cylinder (10) is released, characterized in that a regulating valve (2), a sensor valve (4), a triggering board transmission mechanism (5) and a stop disc (6) are provided between the control valve (9) and the brake cylinder (10), a triggering head provided at the lower end of the stop disc (6) being directly opposite the center of a triggering board (28) of the triggering transmission mechanism (5), and the sensor valve (4) being connected through pipes with the control valve (9), the regulating valve (2), the brake cylinder (10) and a pressure reduction reservoir (7) respectively;

said device being further characterized in that said triggering board transmission mechanism (5) comprises a crosstie (26) which is supported on its opposite ends by a respective bearing pad (25) provided on an inner side of the truck sideframe of the railway vehicle;

a wearing plate (23) and an adjustment plate (24) provided between each end of the crosstie (26) and the bearing pad (25);

a bolt (22) which is inserted through the end of the cross tie (26) and oblong holes in the wearing plate (23) and adjustment plate (24) so that the crosstie (26) can be moved somewhat in the lateral direction of the railway vehicle.

8. A load dependent braking pressure regulating device for railway vehicles according to claim 7, characterized in that said crosstie (26) is provided with safety chains (27).

9. A load dependent braking pressure regulating device for railway vehicles, comprising an auxiliary reservoir (8) for storing pressurized air from a train pipe;

a brake cylinder (10); and

a control valve (9) operated by means of the pressure difference between the train pipe and the auxiliary reservoir (8) in such a manner that the pressurized air from the auxiliary reservoir (8) enters the brake cylinder (10) through the control valve (9) upon braking and that the pressurized air from the brake cylinder (10) is discharged to the atmosphere through the control valve (9) when the brake cylinder (10) is released, characterized in that a regulating valve (2), a sensor valve (4), a triggering board transmission mechanism (5) and a stop disc (6) are provided between the control valve (9) and the brake cylinder (10), a triggering head provided at the lower end of the stop disc (6) being directly opposite the center of a triggering board (28) of the triggering transmission mechanism (5), and the sensor valve (4) being connected through pipes with the control valve (9), the regulating valve (2), the brake cylinder (10) and a pressure reduction reservoir (7) respectively;

said device being further characterized in that the sensor valve (4) comprises first and second parts (49, 50), the first part (49) being connected through pipes to the regulating valve (2) and the brake cylinder (10) for cooperating with the regulating valve (2) to control the pressure of the air entering the brake cylinder (10), and the second part (50) being connected through pipes to the control valve (9) and the pressure reduction reservoir (7) for controlling the pressure of the air entering the pressure reduction reservoir (7).