公开(公告)号：US5426874A

公开(公告)日：1995-06-27

申请号：US248197

申请日：1994-05-24

申请人： Kazushi Nakata ,  Shigenori Matsushita ,  Shigeru Yamamoto ,  Shu h-uai Zhang ,  Satoru Nihsida

发明人： Kazushi Nakata ,  Shigenori Matsushita ,  Shigeru Yamamoto ,  Shu h-uai Zhang ,  Satoru Nihsida

IPC分类号： E02F3/85 ,  E02F3/84 ,  E02F3/28

CPC分类号： E02F3/844 ,  Y10T74/20201

摘要： In an apparatus for controlling the vertical movement of a scraper blade (18) of a bulldozer, a four-position hydraulic control valve (12), having HOLD, UP, DOWN, and FLOAT positions, maintains the scraper blade in the FLOAT condition without requiring a detent mechanism, even when the three-position operation lever (1, 51) is released with the hydraulic control valve (12) in the FLOAT position. The operation lever (1, 51), having HOLD, UP, and DOWN positions, provides electrical signals to a controller (4) for actuating the hydraulic control valve (12) with pilot pressures provided via solenoid pilot valves (6, 7). A hydraulic cylinder (19), connected to the scraper blade (18), is actuated by hydraulic oil from the hydraulic control valve (12). A control device (2, 52), for generating an electrical signal for the FLOAT position and transmitting that electrical signal to the controller (4), is provided on the three-position operation lever (1, 51), so that the hydraulic control valve (12) is held at the FLOAT position in response to the electrical signal from the control device (2, 52).

摘要翻译： 在用于控制推土机的刮刀（18）的垂直运动的装置中，具有HOLD，UP，DOWN和FLOAT位置的四位液压控制阀（12）将刮刀保持在FLOAT状态而没有 即使当液压控制阀（12）处于FLOAT位置时释放三位操作杆（1,51）时，也需要制动机构。 具有HOLD，UP和DOWN位置的操作杆（1,51）向控制器（4）提供用于通过电磁导阀（6,7）提供先导压力来驱动液压控制阀（12）的电信号。 连接到刮刀（18）的液压缸（19）由液压控制阀（12）的液压油致动。 用于产生用于FLOAT位置的电信号并将该电信号传送到控制器（4）的控制装置（2,52）设置在三位操作杆（1,51）上，使得液压控制 响应于来自控制装置（2,52）的电信号，阀（12）保持在FLOAT位置。