Brake piston assembly

Patent metadata

Field	Value
Publication number	US-10035526-B2
Application number	US-201414559504-A
Country	US
Kind code	B2
Filing date	Dec 3, 2014
Priority date	Dec 3, 2014
Publication date	Jul 31, 2018
Grant date	Jul 31, 2018

Abstract

A brake cylinder piston assembly having a composite piston head having a bore formed therethrough, a cup positioned in the bore and coupled to the piston head, and a hollow rod securely welded to the cup. The cup is coupled to the piston head by a series of fingers with locking tabs that extend around the bore of the piston head and engage a rim of the cup. The bore of the piston head has two steps that correspond to the two steps formed into outside of the cup so the two step outer diameter of the cup is securely seated in the two step inner diameter of the bore. A plastic load disc having a hemispherical cavity may be positioned within the end of the hollow rod that is secured to the cup to absorb high energy hand brake releases.

First claim

What is claimed is:

1. A brake cylinder piston assembly, comprising:
a piston head having a bore formed therethrough that defines a first portion having a first inner diameter and a second portion having a second inner diameter that is greater than the first inner diameter;
a cup having a central cavity defined by a first portion having a first outer diameter and a second portion having a second outer diameter that is larger than the first outer diameter and that forms a rim about the central cavity that is positioned in the bore so that the first outer diameter and second outer diameter engage the first inner diameter and second inner diameter, respectively;
a series of fingers extending from the second portion of the piston head circumferentially around the bore and engaging the rim of the cup; and
a hollow rod extending within the central cavity and within the first portion and the second portion of the cup and secured to the cup.

2. The assembly of claim 1 , wherein each of the fingers includes a locking tab that engages the rim of the cup.

3. The assembly of claim 2 , wherein the first outer diameter of the cup is securely seated in the first inner diameter of the bore.

4. The assembly of claim 3 , wherein the second outer diameter of the cup is securely seated in the second inner diameter of the bore.

5. The assembly of claim 2 , further comprising a load disc positioned within the end of the hollow rod that is secured to the cup.

6. The assembly of claim 5 wherein the load disc includes a hemispherical cavity facing away from the cup.

7. The assembly of claim 6 , wherein the piston head is made from a composite material.

8. The assembly of claim 7 , wherein the hollow rod is welded to the cup.

9. The assembly of claim 8 , where the load disc is plastic.

Assignees

• New York Air Brake Llc

Inventors

• Wright Eric C

Classifications

• B61H13/34 Primary

  Details · CPC title

• F16J1/006

  of different materials · CPC title

• F15B15/1447

  Pistons; Piston to piston rod assemblies · CPC title

• B60T17/088

  Mounting arrangements · CPC title

• B60T11/18

  Connection thereof to initiating means · CPC title