US 7,216,940 B2Granted

Adaptation of TMX for axle motion III truck application

AssigneeWabtec Holding Corp.

InventorHoward Sommerfeld

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Abstract

An apparatus engageable with a railway vehicle truck-mounted braking system for compensating for truck bolster movement which includes at least one force transmitting wedge member movable in a reciprocating motion by a pneumatic actuator. The at least one force transmitting wedge member engage rollers rotateably attached to a return push rod member disposed within the truck-mounted braking system for extending the return push rod member to reduce brake shoe clearance prior to brake shoe application. A method for compensating for truck bolster movement also includes fully pressurizing a wedge actuator prior to pressurizing the main brake apparatus actuator. Depressurization of the system returns the force transmitting wedges and return push rod to their original positions upon completion of brake application, subsequently increasing brake shoe clearance for allowable truck bolster movement.

Claims7

Dependent claims

An apparatus engageable with a railway vehicle truck-mounted braking system for compensating for truck bolster movement, said apparatus comprising:

(a) a first actuating means mounted to a fixed member of said truck-mounted braking system, said first actuating means including;
(i) a cylindrical casing attached to said fixed member of said truck-mounted brake system,
(ii) a pneumatic fluid pressure operated piston axially movable in said cylindrical casing;
casing
(iii) a first fluid pressure communicating means disposed adjacent one end of said cylindrical casing for receiving pneumatic pressure, and
(iv) a second fluid pressure communicating means for supplying fluid pressure from said cylindrical casing to a main cylinder upon complete travel of said piston
(b) a force transmitting means includes a wedge member attached to said first actuating means for reciprocal motion thereof and for transmitting force generated by said first actuating means onto linkage disposed within said truck-mounted braking system;
(c) a force receiving means disposed within said linkage;
and
(d) a fluid pressure communication means disposed between said first actuating means and a second actuating means disposed within said truck-mounted braking system.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application: 10/971,875Filed 22 Oct 2004
Published: US 2006/0087174 A127 Apr 2006
Granted: 15 May 2007
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

F16D 65/28
Actuating mechanisms for brakes; Means for initiating operation at a predetermined position: arranged apart from the brake
B60T 15/40
For quick take-up and heavy braking, e.g. with auxiliary reservoir for taking-up slack: with separate take-up and applying cylinders
B61H 13/24
Transmitting mechanisms: for cars with two axles or bogies with two axles and braking cylinder for each bogie, the mechanisms at each side being…
F16D 2121/02
Type of actuator operation force: fluid pressure