Abstract:
A PLANETARY TRANSMISSION HAVING A SERIES OF FLUID OPERATED CLUTCHES AND BRAKES, WHICH ARE ENGAGED AND DISENGAGED THROUGH A SELECTOR VALVE TO CHANGE DRIVE RATIOS, HAS MEANS FOR MODULATING AND SEQUENCING HE FLUID PRESSURES APPLIED TO THE CLUTCHES AND BRAKES TO EFFECT SMOOTH SHOCK FREE SHIFTING. BASIC CONTROL OF THE PRESSURE AT ANY OF THE CLUTCHES AND BRAKES IS EFFECTED BY A SINGLE VALVE COMPLEX UPSTREAM FROM THE SELECTOR VALVE WHILE SUPPLEMENTARY INDIVIDUAL MODULATION MANS ARE PROVIDED DOWNSTREAM FROM THE SELECTOR VALVE AT ONE OR MORE OF THE CLUTCHES OR BRAKES TO OPTIMIZE PERFORMANCE DURING SPECIFIC SHIFTS.
Abstract:
A system for the prevention of a downshift of a transmission in a direct or overdrive mode wherein a pneumatically actuated pin, acting upon a cam, prevents the shifting of a transmission to a lower gear. When a directional valve is actuated by a signal responsive to the transmission being in the torque converter mode, the pin is biased away from the cam allowing such a downshift. When the operator must stop the vehicle at all costs to insure his own safety, a directional valve is actuated by the brake system so as to release the pin, allowing the transmission to be downshifted.
Abstract:
A SYSTEM FOR PREVENTING A VEHICLE FROM TRAVELLING AT AN EXCESSIVELY DANGEROUS RATE OF SPEED INCLUDING A HYDRAULIC CIRCUIT TRIGGERED BY A SPEED SENSING MECHANISM TO ACTUATE AN OTHERWISE MANUAL OR PEDAL ACTUATED BRAKE VALVE.