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    • 13. 发明公开
    • Rear wheel steering system for a vehicle
    • Hinterradlenksystemfürein Fahrzeug。
    • EP0405614A2
    • 1991-01-02
    • EP90112620.1
    • 1990-07-02
    • Mazda Motor Corporation
    • Edahiro, Takeshi
    • B62D7/14
    • B62D7/1536B62D7/1518
    • A rear wheel steering system is disposed in a rear wheel steering mechanism (B) and has a power cylinder (13) for generating a power for steering the rear wheels (2L,2R) in response to a liquid pressure. The power cylinder (13) is connected to a pump (20) as a source of generating the liquid pressure through a high pressure passage (18) and further to a reservoir tank (17) through a low pressure passage (19). The high pressure passage is connected to the low pressure passage through a relief passage on the pump side and a relief passage on the power cylinder side, the relief passages being disposed in parallel to each other. The rear wheel steering system is provided with a passage shifting system (H) for closing the relief passages during stationary period of time while opening each of the relief passages during operation and dividing the high pressure passage between the relief passages into sections and with a narrowed passage portion disposed at the relief passage on the power cylinder side. Operation of the passage shifting system independently allows the high pressure passage on the pump side and the high pressure passage on the power cylinder side to be communicated with the low pressure passage. At this time, the liquid pressure from the power cylinder is gradually released by the action of the narrowed passage portion. The liquid pressure withdrawn from the pump is rapidly released to the low pressure passage without interference with the narrowed passage portion.
    • 后轮转向系统设置在后轮转向机构(B)中,并具有动力缸(13),用于产生用于响应于液压而转向后轮(2L,2R)的动力。 动力缸(13)通过高压通道(18)连接到作为产生液体压力的源的泵(20),并通过低压通道(19)连接到储存罐(17)。 高压通道通过泵侧的释放通道和动力缸侧的释放通道连接到低压通道,所述浮雕通道彼此平行设置。 后轮转向系统设有通道移动系统(H),用于在运行期间打开每个救济通道,并且在释放通道之间的高压通道分成多个部分并且在狭窄状态 通道部分设置在动力缸侧的释放通道处。 通道换档系统的操作独立地允许泵侧的高压通道和动力缸侧的高压通道与低压通道连通。 此时,来自动力缸的液体压力通过变窄的通路部分的作用逐渐释放。 从泵抽出的液体压力被快速地释放到低压通道,而不会与变窄的通道部分干涉。