B - Operations – Transporting – 60 – T
Patent
B - Operations, Transporting
60
T
303/70
B60T 11/34 (2006.01) B60T 8/28 (2006.01)
Patent
CA 1121850
INERTIA SENSING BRAKE PROPORTIONING VALVE ABSTRACT OF THE DISCLOSURE A proportioning valve in a brake system for a vehicle having a loaded and an unloaded condition is coupled to a master cylinder and a wheel cylinder to provide for fluid communication between the master cylinder and the wheel cylinder. A housing forms an inlet communicating with the master cylinder and an outlet communicating with the wheel cylinder. A bore within the housing movably receives a sleeve and a pilot is disposed within a bore on the sleeve. The sleeve terminates in an orifice and one end of the pilot cooperates with the sleeve to vary the opening of the orifice. The other end of the pilot is engageable with an inertia sensing member which is resiliently supported by a cap fastened to the housing. A leaf spring and a coil spring cooperate to dispose the inertia sensing member in a neutral position relative to the housing and the inertia sensing member is responsive to decelera- tion of the vehicle. When the pressurized fluid communicated from the master cylinder to the wheel cylinder is increased, such as during braking, the pilot is biased toward the inertia sensing member and the deceleration of the unloaded vehicle is increased to cause the inertia sensing member to generate a force biasing the inertia sensing member in the direction of the pilot, thereby opposing movement of the pilot in response to pressurized fluid within the housing. The increased pressure within the housing also causes the sleeve to move against a spring to align the sleeve orifice with the pilot to restrict fluid communication to the wheel cylinder in order to compensate for any weight shift of the vehicle during a brake application. If the vehicle is loaded, the deceleration of the vehicle is reduced so that the force generated by the inertia sensing member is also reduced in comparison to the increase of fluid pressure in the housing. Therefore, the pilot moves the inertia sensing member in a direction opposite the force generated thereby, to delay the cooperation between the one end of the pilot and the sleeve orifice.
334298
Bendix Corporation (the)
Macrae & Co.
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