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US 2003/0196859 A1Published application
Brake cylinder unit
AssigneeWestinghouse Air Brake Technologies Corporation
InventorYoshio Asano
Life of this patent
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AssigneeWestinghouse Air Brake Technologies Corporation
InventorYoshio Asano
Estimating the term…
To provide a brake cylinder unit wherein both the normal brake and the spring brake that is used as a parking brake, etc., can act, and in addition wherein it is possible to shorten the axial direction length. In a brake cylinder unit (1) wherein both the normal-service brake means (2) and the spring brake means (3) can act, there is provided a clutch means (4) that links the rod (111) and the second piston (21) when the pressure fluid ceases to act on the second action chamber (24) of the spring brake means (3), and the first piston (21) [sic] starts to move [typo in Japanese] towards to the rod (111). This clutch means (4) comprises a screw (31) that is provided on the rod (111), a nut member (32) that is provided on the second piston (21) such that it can rotate, and a stop means (33) that stops the rotation of the nut member (32) when the second piston (21) starts to move towards the rod (111).
A brake cylinder unit, being a brake cylinder unit with which both a normal-service brake and a spring can be operated that is equipped with (a) a normal-service brake means that possesses a first piston wherein a rod protrudes, and a first spring acts in opposition to a first action chamber, and wherein the above-mentioned first piston moves in the brake direction by overcoming the impetus of the above-mentioned first spring when a pressure fluid acts on the above-mentioned first action chamber, and (b) a spring brake means that possesses a second piston wherein the above-mentioned rod passes completely through and that is provided such that it can move in the axial direction of the above-mentioned rod, and wherein a second spring acts in opposition to a second action chamber, and the above-mentioned second piston moves in the above-mentioned brake direction due to the impetus of the above-mentioned second spring when the pressure fluid ceases to act on the above-mentioned second action chamber,
Dependencies are inferred from the claim text.
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Actuating mechanisms for brakes; Means for initiating operation at a predetermined position: arranged apart from the brake
Brake cylinders other than ultimate actuators: combination of service brake actuators with spring loaded brake actuators
Type of actuator operation force: fluid pressure
Fluid pressure: for releasing a normally applied brake, the type of actuator being irrelevant or not provided for in groups F16D2121/04 - F16D2121/10
Term end not estimated
The present invention relates to a brake cylinder unit with which a normal-service brake and a spring brake used as a parking brake, etc., can be operated, and relates in particular to brake cylinder unit that can shorten the axial length.
In addition to a normal-service brake unit that acts with compressed air, a spring brake unit that acts by means of spring force without any compressed air is used in cases where a railway car is stopped for a long period of time, for the truck brake unit of for example railway cars. When one configures the truck brake unit by installing the normal-service brake unit and the spring unit separately and independently, installation space becomes necessary.
Accordingly, a brake cylinder unit that composes an air brake unit and a spring brake unit in a monobloc has been developed, such that it makes both brake units act through the medium of the same piston rod.
FIG. 1 is a section of the brake cylinder unit for one mode of carrying out the present invention.
FIG. 2 a section along the X-X line of FIG. 1.
FIG. 3 is a section along the Y-Y line of FIG. 1.
An explanation is now provided of one mode for carrying the brake cylinder unit that constitutes the present invention, with reference to figures. FIG. 1 is a section of the brake cylinder unit for one mode of carrying out the present invention. FIG. 2 a section along the X-X line of FIG. 1. FIG. 3 is a section along the Y-Y line of FIG. 1.
In FIG. 1, the brake cylinder unit (1) is composed by providing a clutch means between the rod (111) of the normal-service brake means (2) and the piston (2) of the spring brake means (3), so that the normal-service brake means (2) that acts due to the fluid pressure of compressed air, etc., and the spring brake means (3) that acts due to the impetus of the spring (25), are caused to act through the medium of the same rod (21).
The normal-service brake means (2) possesses a first piston (11) wherein the rod (111) protrudes on one side (the 20 brake direction), and a first cylinder (12) wherein this first piston (11) is inserted so that it can slide freely and the other side (the anti-brake direction) is closed, is provided between the other side of the first piston (11) and the first cylinder (12), and is composed by opposing a first action chamber (14) wherein compressed air is supplied through a first port B and a first spring that is arranged on one side of the first piston (11).