Forward-reverse drive control providing automatic braking

Abstract

Abstract TRACTOR HAVING DUMP VALVE AND FORWARD-REVERSE DRIVE CONTROL EMPLOYING SAME, EFFECTIVE TO AUTOMATICALLY BRAKE THE TRACTOR WHEN REVERSING THE TRACTOR''S DIRECTION OF MOTION. THE TRACTOR HAS BRAKES. A REVERSIBLE TRANSMISSION CONTROLLED BY THE DUMP VALVE, A RANGE SELECTOR VALVE HAVING A CONTROL PORTION, AND A RUN DETECTOR PUMP TO SENSE DIRECTION OF ROLLING MOVEMENT OF THE TRACTOR AND HAVING A DIRECTIONALIZED PUMP OUTPUT. THE DUMP VALVE GENERALLY RECEIVES AGAINST PRESSURE MOVABLE END AREAS THEREOF AN OUTPUT FROM THE RANGE SELECTOR VALVE AND DIRECTS CONTROL PRESSURE TO OPERATE THE BRAKES AND TRANSMISSION IN ALTERNATION TO ONE ANOTHER AND, SPECIFICALLY: RECEIVES AGAINST THE PRESSURE MOVABLE END AREAS THE DIRECTIONALIZED PUMP OUTPUT SO AS TO BE HYDRAULICALLY BALANCED IN A CENTERED POSITION OPERATING THE TRACTOR WITH TRANSMISSION ENGAGED AND BRAKES DISENGAGED, RECEIVES AGAINST THE PRESSURE MOVABLE END AREAS AN UNBALANCING FORCE FROM THE RANGE SELECTOR VALVE CONTROL PORTION CAUSING THE DUMP VALVE TO SHIFT OFF CENTER AND DUMP, NEUTRALIZING THE TRANSMISSION AND SETTING THE BRAKES, AND HAVING VALVE SPRINGS EFFECTIVE TO MECHANICALLY REBALANCE THE DUMP VALVE ATTENDANT WITH SLOW DOWN OF THE RUN DETECTOR PUMP, CAUSING THE DUMP VALVE TO RECENTER, RELEASING THE BRAKES AND ENGAGING THE TRANSMISSION IN AN OPPOSITE DRIVE SETTING.

Inventors

• 👤 Daniel B Shore

Bibliographic Details