Safety device for hydraulic brake booster

Abstract

Abstract A HYDRAULIC BOOST DEVICE IS DISCLOSED WHICH INCLUDES A HOUSING HAVING A FLUID INLET, AN OUTLET, A BORE COMMUNICATING THE INLET WITH THE OUTLET, AND A CHAMBER IN FLUID COMMUNICATION WITH THE BORE. A SPOOL VALVE IS SLIDABLE IN THE BORE FROM A POSITION IN WHICH SUBSTANTIALLY ALL OF THE FLUID FLOW INTO THE INLET IS DIRECTED TO THE OUTLET TO A POSITION IN WHICH A PORTION OF THE FLUID FLOWING INTO THE INLET IS COMMUNICATED TO THE CHAMBER THROUGH A FLUID PASSAGE IN THE VALVE MEANS. THE FLUID IN THE CHAMBER SLIDES A PISTON TO ASSIST THE VEHICLE OPERATOR IN APPLYING THE BRAKES. A CONTROL ROD WHICH IS ACTUATED BY THE VEHICLE OPERATOR WHEN THE VEHICLE''S BRAKES ARE APPLIED IS CONNECTED TO A SLEEVE THAT IS SLIDABLY MOUNTED ON THE SPOOL VALVE. A SPRING NORMALLY PREVENTS RELATIVE MOVEMENT BETWEEN THE SLEEVE AND THE SPOOL VALVE, BUT PERMITS THE SLEEVE TO MOVE RELATIVE TO THE VALVE TO CLOSE THE PASSAGES IF A MALFUNCTION PREVENTS THE SPOOL VALVE FROM MOVING. THIS FEATURE PREVENTS A SUDDEN SURGE OF FLUID FROM BEING COMMUNICATED TO THE CHAMBER DURING A MANUAL BRAKE APPLICATION.

Inventors

• 👤 Robert E Meyers

Bibliographic Details