Deceleration sensing type fluid pressure control device for vehicle brake system

A deceleration sensing type fluid pressure control device for a vehicle brake system, comprising in combination:

• a valve body having a first end and an oppositely disposed second end;
• a proportioning action mechanism located within said valve body and including an axially extending control piston with the axis thereof extending in the direction between the first and second ends of said valve body, said action mechanism arranged for varying the degree of reduction of output fluid pressure from input fluid pressure in relation to a load imposed on said control piston;
• an axially extending adjusting piston located within said valve body with the axis thereof extending in the direction between the first and second ends of said valve body and spaced laterally from the axis of said control piston;
• passage means interconnecting the input fluid pressure of said action mechanism with one end of said adjusting piston;
• a swaying lever located at the first end of said valve body and extending transversely of the axis of said control piston and adjusting piston, said lever having a first end and a second end and a stationary fulcrum spaced between said first and second ends thereof, said lever being in engagement with said control piston between said fulcrum and said first end of said lever;
• a valve mechanism located within said passage means, said valve mechanism controlling flow of the input fluid pressure to said adjusting piston for closing flow thereto when the deceleration of the vehicle reaches a predetermined value;
• and
• spring means in contact with said lever on the opposite side of said fulcrum from said control piston and including a control spring extending between said adjusting piston at a location spaced from the location where the input fluid pressure contacts said adjusting piston and said lever with said spring means contacting said lever between said fulcrum and the second end thereof, and said control spring arranged to impose said load on said control piston via said lever.