WO1996026854A1

WO1996026854A1 - Combined brake cylinder adjuster

Info

Publication number: WO1996026854A1
Application number: PCT/MK1996/000001
Authority: WO
Inventors: Stojc^¿e SMILESKI
Original assignee: Mzt Hepos
Priority date: 1995-02-28
Filing date: 1996-02-27
Publication date: 1996-09-06

Abstract

The invention relates to a combined parking brake cylinder (8) and service brake cylinder (19) with slack adjuster (17) for railway vehicles. It comprises a service brake piston (4, 4') and a parking brake piston (9, 9'), applied by a spring (10) and released by pressurisation of the parking brake cylinder (8). A bush (11) engages the parking brake piston (9, 9') by a non-self-locking thread and transmits braking forces therefrom to the service brake piston (4, 4') and to a thrust rod (6). A locking rod (14) engages an internal toothing on the bush (11), fixing it rotationally. To release the parking brake without pressurising the parking brake cylinder (8), the locking rod (14) is disengaged from the internal toothing of the bush (11) thus permitting rotation of the bush (11) and axial movement of the parking brake piston (9, 9') without force transmission to the service brake piston (4, 4') and the thrust rod (6).

Description

COMBINED BRAKE CYLINDER ADJUSTER

Technical Field

This invention comes from a brake field for various types of vehicles especially railway vehicles. It is used in accordance with an adequate system of rods for stopping the vehicle wheel turning in motion that is i.e. working with fluid insertion in the corresponding cylinder chamber and performing parking braking on vehicle which standstill, with discharging of the fluid from the other cylinder. Background Art

The technical problem solved by this cylinder is the uniting of two obligated brakes on the vehicles, i.e. working or automatic brake and parking brake.

The above brake are obligated and they act on the same disc place or directly on the wheel. The solving of the parking and working brake must be outlined to enable independent function of the one related to the other brake and according to the needs they act simultaneously. The invention is designed to fulfill the requirement and to physically unite the two devices for stopping in one entity, through the locking, mechanism. Conceptually the innovation differs from the others on the world market and it is adapted for easily changing the already existing devices applied.

Disclosure of Invention

The design solution of the combined cylinder adjuster ( fig 1 ) according to this innovations generally consists of three independent devices: Brake cylinder adjuster for working braking ( fig 2 ). Brake cylinder with spring ( fig 3 ) and traveling locking mechanism ( fig 4 ). All three cylinders are united in one device fixed with bolts ( 1 ) placed on the cylinder external side and external bush ( 16 ). The innovation building - in the brake rods is performed assembling the same through the openings ( 2 ) and ( 3 ). Activation of the working ( automatic ) brake is accomplished with fluid insertion in the space between the piston ( 4 ) and the cylinder bottom ( 5 ) activating the piston ( 4 ) which moves the adjuster ( 17 ) through the piston lever ( 4' ), due to this the braking process is performed. During discharge of the fluid in the atmosphere the released spring ( 7 ) returns the piston ( 4 ) to previous state together with the pre-mentioned positions. Readiness for activation of the brake cylinder with spring is provided with fluid insertion in the space between the cylinder bottom ( 5 ) and the piston ( 9 ) during which the spring ( 10 ) is tamped in the space between the piston ( 9 ) and the housing ( 8 ). Under the influence of the fluid the piston ( 9 ) screws the threaded bush with internal toothing ( 11 ) into the both bearings ( 12 and 13 ) from the locking mechanism

( fig.3 ) during which the threaded bush with internal toolhing is locked with the locking rod ( 14 ) placed on the traveling bush ( 15 ) which is moved in the cylinder ( 8 ) through internally grooved bush ( 16 ). The braking process is achieved by discharging the fluid in the atmosphere resulting in the piston ( 9 ) moving by the piston lever ( 9' ), the piston together with the threaded piston lever ( 9' ) and the traveling locking mechanism ( fig 3 ) activates the control rod ( 6 ) through the adjuster ( 17 ). In some necessary cases during the brake slacking without insertion of fluid under pressure, between the plate ( 5 ) and the piston ( 9 ), the traveling locking mechanism is activate through the rod ( 18 ) and the locking rod ( 14 ) comes out from the connection with the threaded bush ( 11 ), the same is screwed into the bearings ( 12 and 13 ) and moves towards the housing ( 8 ), the piston ( 9 ) returns to the starting position on the cylinder ( 5 ) bottom. Due to this the process of brake slacking i.e. /that is returning of control rod ( 6 ) to its previous position is achieved. In normal use, the brake cylinder for parking brake executes slacking of the control lever ( 6 ) by the insertion of fluid in the chamber between the cylinder bottom ( 5 ) and the piston ( 9 ) resulting in the return of the above mentioned position to the starting position.

Claims

1. The combined brake cylinder adjuster characterized by that cylinder for working brake consists of housing (8), piston with double packing (4), piston-rod (4'), adjuster (17), control rod (6) and release spring (7), connected in one entity with the brake cylinder for parking consisting of cylinder bottom (5), piston (9), spring (10), piston-rod (9') and locking mechanism consist of threaded bush with internal toothing (11), two axial bearings (12 and 13), traveling bush (15), cog (14), rod (18) and spring (21).

2. The combined brake cylinder adjuster according to the claim 1 characterized by that cylinder of the parking brake (fig 3) which is placed behind the cylinder for the working brake (fig 2) and fixed with the bolts

(1).

3. The combined brake cylinder adjuster according to the claim 3 characterized by that locking mechanism (fig 4) which is assembled on the piston-rod (9 ) from the cylinder with spring, through the traveling thread connection (9 ' ,11) and with the cylinder adjuster for working braking through free contact.

4. The combined brake cylinder adjuster according to the claim 3 characterized by that traveling locking mechanism (fig 4) which is placed in the grooved bush (16) which realizes a connection with the housing (8) and rectilinear motion during activation of the cylinder with spring.

5. The combined brake cylinder adjuster according to the claim 4 characterized by that traveling locking mechanism (fig 4) which assembled with the grooved bush (16) could be fixed radial in different positions depending on the need.

6. The combined brake cylinder adjuster according to the claim 1 characterized by that adjuster (17) which represents a part of the working brake (4) cylinder piston fixed with elastic element (22).