B - Operations – Transporting – 60 – T
Patent
B - Operations, Transporting
60
T
303/83
B60T 11/16 (2006.01) B60T 11/20 (2006.01) B60T 11/224 (2006.01) B60T 11/34 (2006.01) B60T 17/22 (2006.01)
Patent
CA 1085896
A CONTROL FOR A TWO STAGE MASTER CYLINDER ABSTRACT OF THE DISCLOSURE A two stage master cylinder having a bore with a first diameter and a second diameter separated by a shoulder. A first piston is located in the first diameter of the bore to establish a first chamber. A second piston has a first section located in the first diameter of the bore to establish a second chamber and a second section located in the second diameter of the bore to establish an actuation chamber therein. A first passage in the second piston connects the actuation chamber with the second chamber. A second passage in the second piston connects the first passage to a reservoir in the housing. A shuttle piston located in the first passage has a first surface area exposed to the second chamber and a second smaller surface area exposed to the actuation chamber. A spring urges the shuttle piston toward the second chamber. An input force from an operator moves the second piston causing fluid to flow from the actuation chamber through the first passage to the second chamber. The first section of the second piston acts on actuation fluid and the operational fluid in the second chamber and the first piston acts on the operational fluid in the first chamber to provide the front and rear wheel brakes with a braking signal. The operational fluid in the second chamber acts on the first surface of the shuttle and overcomes the spring to establish communication of between the actuation chamber and the reservoir through the second passage. Thereafter, the entire input force from the operator acts on the first section of the second piston to pressurize the operational fluid in the first and second chambers in the generation of the braking signal.
310690
Bendix Corporation (the)
Macrae & Co.
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