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1. 发明授权

US4183287A Hydraulic control apparatus for tractor 失效
标题翻译：拖拉机液压控制装置
公开(公告)号：US4183287A
公开(公告)日：1980-01-15
申请号：US837038
申请日：1977-09-27
申请人： Toshihiko Hamada , Shiro Okuda
发明人： Toshihiko Hamada , Shiro Okuda
IPC分类号： B62D49/02 , F15B9/10 , F15B13/06
CPC分类号： B62D49/02
摘要： A position control valve provided for controlling a first hydraulic unit is also operable to control a second hydraulic unit. The apparatus comprises the first hydraulic unit for raising and lowering a primary working implement, the second hydraulic unit for raising and lowering a secondary working implement, the control valve for controlling the first hydraulic unit, and a feedback mechanism for returning the control valve to its neutral position for every position of a control lever in operative relation to the upward or downward movement of the primary working implement. A guide plate for the control lever for operating the control valve provides a second operation range for the secondary working implement having a neutral position corresponding to a maximum lift position for the primary working implement. Elastic regulating means is mounted on the guide plate for the second operation range to set the control lever in position. The control lever is automatically and accurately returnable to the neutral position when operated against the elastic means and thereafter released from the hand.
摘要翻译：设置用于控制第一液压单元的位置控制阀也可操作以控制第二液压单元。该装置包括用于升降主工具的第一液压单元，用于升降二次作业工具的第二液压单元，用于控制第一液压单元的控制阀，以及用于将控制阀返回到其的反馈机构控制杆的每个位置的中立位置与主要作业工具的向上或向下运动有关。用于操作控制阀的控制杆的引导板为具有对应于主作业工具的最大提升位置的中立位置的二次作业工具提供第二操作范围。弹性调节装置安装在导板上用于第二操作范围以将控制杆设置在适当位置。当对着弹性装置操作时，控制杆自动且准确地返回到中立位置，然后从手中释放。

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