Pressure generator unit for hydraulic braking system
AssigneeSociete Anonyme D.B.A.
InventorsJean-Jacques Carre, Roland Levrai
Life of this patent
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Abstract
The generator unit is of the type including a valve (14,114,214,314) for maintaining a residual pressure. The valve (14,114,214,314) comprises a closure element (32,132,232,332) urged by a spring (42,142,242,342) towards a seat (30,130,230,330). According to the invention, it also includes a temporary retaining member (50,152,252,352) holding off the force of the spring and responsive to at least the presence of brake fluid to release the spring (42,142,242,342). The invention and application may be utilized in hydraulic braking systems for motor vehicles.
Claims16
A pressure generator unit for the hydraulic braking system of a motor vehicle, including a pressure source, a valve for maintaining residual pressure and inserted in a conduit connecting said source to at least one brake motor of said vehicle, said valve comprising a housing provided with an inlet orifice in connection with said source, an outlet orifice to be connected to said motor, a chamber between said orifices and a valve seat located near said outlet orifice, a closure element being mounted in said chamber opposite said seat and for being urged by resilient means into sealing engagement with said seat, characterized in that the valve includes temporary retaining means holding off the force of said resilient means and preventing said sealing engagement, said temporary retaining means being responsive to at least the presence of brake fluid in said chamber to release irreversibly said resilient means which thereafter urges said closure means into sealing engagement with said valve seat.
A valve for maintaining residual pressure of a pressure generator unit, comprising a housing provided with an inlet orifice to be connected to a source of pressurized brake fluid and an outlet orifice to be connected to at least one brake motor, a chamber between said orifices and a valve seat located near said outlet orifice, a closure element being mounted in said chamber opposite said seat and for being urged by resilient means into sealing engagement with said seat, characterized in that the valve includes temporary retaining means holding off the force of said resilient means, said temporary retaining means being responsive to at least the presence of brake fluid in said chamber to release irreversibly said resilient means which thereafter urges said closure means into sealing engagement with said valve seat.
Dependencies are inferred from the claim text.