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    • 20. 发明授权
    • Hydraulic control system for four-wheel drive torque transfer mechanism
for vehicle
    • 用于车辆的四轮驱动扭矩传递机构的液压控制系统
    • US4827807A
    • 1989-05-09
    • US427054
    • 1982-09-29
    • Yoichi HayakawaYasunobu ItoTakahiro Sakai
    • Yoichi HayakawaYasunobu ItoTakahiro Sakai
    • B60K23/08B60K17/344F16H59/70F16H61/70
    • F16H61/702B60K17/344F16H2300/18F16H2306/44F16H2306/52F16H59/70F16H61/16F16H61/686Y10T477/613
    • A hydraulic control system for a four-wheel drive torque transfer mechanism for a vehicle, including an automatic transmission, a transfer mechanism having gear positions of a two-wheel drive direct-coupling mode H.sub.2, a four-wheel drive direct-coupling mode H.sub.4 and a reduced-speed four-wheel drive mode L.sub.4, and a hydraulic control circuit for controlling the transmission and the transfer mechanism. The transfer mechanism includes a reduction gear mechanism, a first output shaft, a second output shaft rotationally connectible to the first output shaft through a link mechanism, a four-wheel drive clutch for releasably coupling the first and second output shafts, a direct-coupling clutch for releasably coupling an input shaft of the reduction gear mechanism with the first output shaft, and a reduction brake for setting the reducing gear mechanism in a gear train of the reduced-speed mode. The hydraulic control circuit includes an inhibitor valve which is supplied with governor pressure and which selectively applies pressurized fluid to one of the servomotors of the direct-coupling clutch and reduction brake while draining the other servomotor, the inhibitor valve feeding pressurized fluid continuedly to the servomotor of the direct-coupling clutch if manual shift of the transfer mechanism selects the mode L.sub.4 when the governor pressure is higher than a predetermined level, and instead feeding pressurized fluid to the servomotor of the reduction brake and draining the servomotor of the direct-coupling clutch when the governor pressure drops below the predetermined level.
    • 一种用于车辆的四轮驱动扭矩传递机构的液压控制系统,包括自动变速器,具有两轮驱动直接耦合模式H2的档位的传送机构,四轮驱动直接耦合模式H4 和低速四轮驱动模式L4,以及用于控制变速器和转移机构的液压控制电路。 传递机构包括减速齿轮机构,第一输出轴,通过连杆机构可旋转地连接到第一输出轴的第二输出轴,用于可释放地联接第一和第二输出轴的四轮驱动离合器,直接联接 用于将减速齿轮机构的输入轴与第一输出轴可释放地联接的离合器,以及用于将减速齿轮机构设置在减速模式的齿轮系中的减速制动器。 液压控制回路包括一个抑制阀,该抑制阀被提供调速器压力,并且在排出另一个伺服电机的同时选择性地将加压流体施加到直接联接离合器和减速制动器的一个伺服电动机中,抑制阀连续向伺服电动机供给加压流体 如果调速器压力高于预定水平时,传动机构的手动换档选择模式L4,而是将加压流体输送到减速制动器的伺服电机并排出直接联轴器离合器的伺服电动机 当调速器压力下降到预定水平以下时。