Master cylinder apparatus
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United States of America Patent
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Issued Date -
Mar 31, 2005
app pub date -
Aug 25, 2004
filing date -
Sep 30, 2003
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A master cylinder apparatus for a BBW system is provided, which enables a simulator passage for communication between a stroke simulator and a fluid pressure chamber in a master cylinder to be smoothly and reliably closed, without risk of damage to a stop valve provided in the simulator passage, without requiring an increase in size of the master cylinder. The master cylinder apparatus comprises a tandem-type master cylinder including a cylinder body adapted to be connected to wheel cylinders through fail-safe valves and a stroke simulator for ensuring a desired stroke of a brake pedal upon receiving a brake fluid introduced from a first fluid pressure chamber in the master cylinder through a simulator passage. In the event of failure of the BBW system, an opening/closing means closes the simulator passage in accordance with movement of a secondary piston. The opening/closing means comprises a poppet valve and a rocking lever which moves together with the secondary piston so as to open and close the poppet valve.
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