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51. 发明授权

US4503927A Hydraulic control system for four-wheel drive transfer mechanism for vehicles 失效
标题翻译：车辆四轮驱动传动机构液压控制系统
公开(公告)号：US4503927A
公开(公告)日：1985-03-12
申请号：US427026
申请日：1982-09-29
申请人： Yoichi Hayakawa , Yasunobu Ito
发明人： Yoichi Hayakawa , Yasunobu Ito
IPC分类号： B60K23/08 , B60K17/34 , B60K17/346 , F16H61/06 , F16H61/08 , F16H61/70
CPC分类号： F16H61/702 , B60K17/3467 , F16H2306/44 , F16H2306/52 , F16H61/065 , F16H61/08 , F16H61/686 , Y10T477/613 , Y10T477/69373
摘要： A hydraulic control system for a four-wheel drive transfer mechanism for vehicles, including an automatic transmission, a transfer mechanism having a two-wheel drive direct-coupling gear (H.sub.2), a four-wheel drive direct-coupling gear (H.sub.4) and a reduced-speed four-wheel drive gear (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 connected to the first output shaft by means of a linkage, a four-wheel drive clutch for detachably connecting or disconnecting the first and second output shafts, direct-coupling clutch for connecting or disconnecting the input shaft of the reduction gear mechanism and the first output shaft and a reduced-speed drive brake for shifting the reduction gear mechanism into the reduced-speed range. The hydraulic control circuit includes a down-shift timing valve adapted to be operated by the line pressure of the hydraulic control circuit to distribute the pressurized fluid to the respective servomotors of the direct-coupling clutch and the reduced-speed drive brake so as to make the reduced-speed drive brake start engaging before the direct-coupling clutch is disengaged when the line pressure is lower than a predetermined level and to engage the reduced-speed drive brake after the direct-coupling clutch has been disengaged when the line pressure is higher than the predetermined level.
摘要翻译：一种用于车辆的四轮驱动传递机构的液压控制系统，包括自动变速器，具有两轮驱动直接联接齿轮（H2）的传动机构，四轮驱动直接联接齿轮（H4）和减速四轮驱动齿轮（L4）和用于控制变速器和转移机构的液压控制回路。传动机构包括减速齿轮机构，第一输出轴，通过连杆连接到第一输出轴的第二输出轴，用于可拆卸地连接或断开第一和第二输出轴的四轮驱动离合器，用于连接或断开减速齿轮机构的输入轴和第一输出轴的联接离合器和用于将减速机构转换到减速范围的减速驱动制动器。液压控制回路包括适于由液压控制回路的管路压力操作的下移正时阀，以将加压流体分配到直接联接离合器和降速驱动制动器的各个伺服电动机，以便使当线路压力低于预定水平时，直接离合器离合器之前，减速驱动制动器开始接合，并且当线路压力较高时直接联轴器离合器已经脱离后接合减速驱动制动器超过预定水平。

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