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    Hydromechanical transmission control
    1.
    发明授权
    Hydromechanical transmission control 失效
    水力传动控制

    公开(公告)号：US3592281A

    公开(公告)日：1971-07-13

    申请号：US3592281D

    申请日：1969-06-17

    申请人： GEN MOTORS CORP

    发明人： UTTER ROBERT C ,  CHRISTENSON HOWARD W

    IPC分类号： B62D11/04 ,  B60K17/10 ,  F02B75/02

    CPC分类号： B60K17/10 ,  F02B2075/025 ,  F16H2061/6601

    摘要： A control for an engine-driven dual-output hydromechanical transmission having hydraulic pumps and motors operative in conjunction with mechanical gearing to drive each output wherein the hydraulic ratio between the pumps and motors is controlled automatically to produce forward and reverse drive and manually to produce steer by driving. The automatic control includes a differential gearing arrangement and is responsive to engine parameters to change the hydraulic ratios of the hydraulic pumps and motors equally in the same direction while the manual control which also includes differential gearing is operative to change the hydraulic ratios equally in opposite directions thus providing steer by driving. The control also provides a hydraulic circuit and control valving to establish and maintain the neutral position of the hydraulic pumps and motors on operator demand without the aid of a mechanical stop.