Transmission control system
    2.
    发明授权

    公开(公告)号:US3618424A

    公开(公告)日:1971-11-09

    申请号:US3618424D

    申请日:1969-09-02

    CPC classification number: F16H47/085 Y10S74/01

    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.

    Downshift prevention device with brake or convertor override
    5.
    发明授权
    Downshift prevention device with brake or convertor override 失效
    用制动器或转换器覆盖的DOWNSHIFT预防装置

    公开(公告)号:US3598209A

    公开(公告)日:1971-08-10

    申请号:US3598209D

    申请日:1968-12-16

    Inventor: PEARCE SHAIRYL I

    CPC classification number: B60T11/103 Y10T74/19163 Y10T74/20091 Y10T74/20714

    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.

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