The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 07, 2010
Filed:
Jul. 27, 2006
Antony Schodrowski, Lisieux, FR;
Sebastian Le Mer, Auquainville, FR;
Antony Schodrowski, Lisieux, FR;
Sebastian Le Mer, Auquainville, FR;
KNORR-BREMSE Systeme fuer Nutzfahrzeuge GmbH, Munich, DE;
Abstract
A combined service brake and spring brake cylinder has a diaphragm arranged in a housing of the service brake cylinder. At one side, the diaphragm delimits a service brake chamber acted on with a service brake pressure, and at the other side delimits a chamber accommodating a return spring. A spring brake piston is arranged in a housing of the spring brake cylinder, which at one side delimits a spring brake chamber and at the other side delimits a spring chamber. A piston rod supports a ventilation valve which produces or blocks a flow connection between the spring chamber and the service brake chamber. The ventilation valve includes a piston interacting with a valve seat. At least one further piston interacts with a further valve seat and opens at least one further flow cross-section when in its position raised from the further valve seat. When the parking brake is applied and the service brake is simultaneously actuated with service brake pressures lower than a pressure threshold, one piston is raised from the valve seat and the further piston is sealed against the further valve seat.