Patent ID: 9586567
Date: 2017-03-07
CPC Classifications: B60T,F16D,F16K

Claim:
1. A spring brake cylinder for a vehicle, comprising: a housing of the spring brake cylinder; a spring brake piston arranged in the housing and being actuable via a preloaded spring, the spring brake piston separating a spring chamber containing the preloaded spring from a spring brake chamber which is ventilated for release and vented for deployment; a diaphragm valve configured to vent the spring chamber directly to atmosphere, the diaphragm valve comprising at least one resiliently movable outlet diaphragm and at least one resiliently movable inlet diaphragm, wherein in a home position, the inlet diaphragm and the outlet diaphragm contact an associated valve seat in a closed position, in an event of a pressure difference exceeding a respective minimum pressure value between the spring chamber and the atmosphere, the inlet and outlet diaphragms are controlled into an open position lifted-off of the associated valve seat in order to increase and decrease pressure in the spring chamber, the at least one inlet diaphragm and the at least one outlet diaphragm are connected to a base member which is retained in a central through-opening in a base of the spring chamber, the base member is constructed in an integral manner from a resilient material, having a retention portion which is assembleable in a positive-locking manner with resilient deformation in the through-opening in the base of the spring chambers; a retention pin is retained on the base member, on which retention pin is formed the at least one inlet diaphragm and/or the at least one outlet diaphragm, which cooperates as a diaphragm valve with at least one connection opening formed in the base member or in the base between the spring chamber and the atmosphere, the at least one outlet diaphragm is formed at the end side in the manner of a lip on a web of the base member, which web bridges an annular recess in an outer face of the base of the spring brake cylinder, and the outlet diaphragm cooperates with at least one outer valve seat at the edge of at least one connection opening in the base of the spring brake cylinder, wherein the web and the at least one outlet diaphragm are constructed integrally with the base member.