Spring applied parking brake actuator having a collet style...

B - Operations – Transporting – 61 – H

Patent

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Details

B61H 13/20 (2006.01) B60T 7/00 (2006.01) B60T 17/08 (2006.01) B61H 15/00 (2006.01) F16D 65/14 (2006.01)

Patent

CA 2217245

A brake actuator for use on passenger transit railway vehicles. The actuator includes a housing containing a service piston and a parking brake piston. The service piston is connected to an inner hollow stem having a forward conical surface disposed to engage a conical surface of a collet provided on a threaded rod located within the stem. The parking brake piston has a hollow outer sleeve surrounding the hollow stem, while a coil spring is located about the outer sleeve for applying a braking force when fluid pressure is removed from a housing containing the parking brake piston. The spring expands against a locking ring located on a forward sleeve secured to an intermediate sleeve that engages the hollow stem. This causes forward movement of the outer sleeve and forward movement of the conical portion of the hollow stem into engagement with the conical portion of the conical surface of the collet. This, in turn, moves the threaded rod to engage brake applying components of a transit vehicle.

Récepteur de freinage à utiliser sur des véhicules ferroviaires de passagers. Le récepteur comprend un logement contenant un piston de service et un piston de frein de stationnement. Le piston de service est raccordé à une tige intérieure creuse ayant une surface conique avant placée pour engager une surface conique d'une bague de serrage située sur une tige filetée placée à l'intérieur de la tige. Le piston de frein de stationnement comprend un manchon extérieur creux entourant la tige creuse pendant qu'un ressort à boudin entoure le manchon extérieur pour exercer une force de freinage lorsque la pression du fluide est retirée depuis un logement contenant le piston de frein de stationnement. Le ressort se dilate contre un anneau de verrouillage situé sur un manchon avant fixé à un manchon intermédiaire qui engage la tige creuse ce qui provoque le déplacement vers l'avant du manchon extérieur et de la partie conique de la tige creuse dans un engagement avec la partie conique de la surface conique de la bague de serrage. La tige filetée y est ainsi déplacée de façon à engager les éléments d'application de freinage d'un véhicule de transport en commun.

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