公开(公告)号：US20040154295A1

公开(公告)日：2004-08-12

申请号：US10455689

申请日：2003-06-05

Applicant: VOLVO CONSTRUCTION EQUIPMENT HOLDING SWEDEN AB

Inventor： Young Mo Ju

IPC: F16D031/02

CPC classification number: F16H61/42 ,  F04B49/002 ,  F16H61/423

Abstract: The speed control apparatus for a hydraulic actuator includes a hydraulic source, an actuator connected with the hydraulic source and driven based on a supply of an operation oil, a direction switching valve which is switchably installed in a flow path between the hydraulic source and the actuator, an inclination piston which is installed between a parallel flow path in parallel connected with a flow path in a supply side of the actuator and the actuator for thereby controlling an inclination angle of an inclination plate of the actuator, a multi-step adjusting inclination piston which is driven when an operation oil is supplied, and adjusts an inclination angle of an inclination plate of the actuator based on multiple steps, and a multi-step adjusting control valve which is switchably installed in a flow path between the parallel flow path and the multi-step adjusting inclination piston, controls an operation oil supplied to the multi-step adjusting inclination piston, and adjusts a speed of the actuator. The multi-step adjusting control valve is formed of a first zone in which the actuator is rotated at a high speed, a second zone in which the actuator is rotated at an intermediate speed, and a third zone in which the actuator is rotated at a low speed.

Abstract translation: 用于液压致动器的速度控制装置包括液压源，与液压源连接并且基于操作油的供给而被驱动的致动器;方向切换阀，其可切换地安装在液压源和致动器之间的流动路径中 ，倾斜活塞，其安装在与所述致动器的供给侧中的流路并联连接的平行流路和所述致动器之间，从而控制所述致动器的倾斜板的倾斜角;多台阶调整倾斜活塞 其在供给操作油时被驱动，并且基于多个步骤来调节致动器的倾斜板的倾斜角度;以及多级调节控制阀，其可切换地安装在平行流路和 多级调节倾斜活塞，控制供给多级调节倾斜活塞的操作油，并调整为 致动器的速度。 多级调节控制阀由致动器高速旋转的第一区域，致动器以中间速度旋转的第二区域和致动器在其中旋转的第三区域形成 低速。