公开(公告)号：EP0761966A3

公开(公告)日：1997-04-02

申请号：EP96111778.5

申请日：1996-07-22

Applicant: CATERPILLAR INC.

Inventor： Childress, Dale B. ,  Manring, Noah D.

IPC: F04B49/08

CPC classification number: F04B49/08 ,  F04B2201/1202 ,  F04B2201/1204

Abstract: A pump displacement control (10) for a variable displacement pump (11) includes a torque control valve (26) disposed between a variable torque limiter (34) and a force applying device (60) disposed in axial alignment within a common bore (19). A sleeve (27) and a valve spool (29) are movable relative to each other to establish a first condition communicating discharge pressure into an actuator chamber (17) to move a swashplate (12) toward a minimum displacement position against the bias of a spring (16) or a second condition communicating the actuating chamber with an exhaust passage (23) to allow the spring to move the swashplate toward its maximum displacement position. A torque control piston (39) disposed between opposing springs (48,49) resiliently bias the valve spool in a direction to establish the second condition when control fluid is directed into a control chamber (46). Pump discharge pressure communicated into a pressure chamber (63) exerts a force against the valve spool proportional to the discharge pressure so that the valve spool moves in a second direction to establish the first condition when the control force exceeds the biasing force exerted by the torque limiter.

Abstract translation: 用于可变排量泵（11）的泵排量控制装置（10）包括设置在可变转矩限制器（34）与力施加装置（60）之间的转矩控制阀（26），该力转换装置（60） ）。 套筒（27）和阀芯（29）可相对于彼此移动以建立将排出压力传送到致动器腔室（17）中的第一状态，以将斜盘（12）朝着最小位移位置克服 弹簧（16）或使致动室与排气通道（23）连通的第二状态，以允许弹簧将斜盘移向其最大位移位置。 布置在相对的弹簧（48,49）之间的扭矩控制活塞（39）在控制流体被引导到控制腔室（46）中时沿着建立第二状态的方向弹性偏置阀芯。 连通到压力室（63）中的泵排出压力对阀芯施加与排出压力成比例的力，使得当控制力超过由转矩施加的偏置力时，阀芯沿第二方向移动以建立第一状态 限制器。

公开(公告)号：EP0761966B1

公开(公告)日：2001-05-16

申请号：EP96111778.5

申请日：1996-07-22

Applicant: CATERPILLAR INC.

Inventor： Childress, Dale B. ,  Manring, Noah D.

IPC: F04B49/08

CPC classification number: F04B49/08 ,  F04B2201/1202 ,  F04B2201/1204

公开(公告)号：EP0761966A2

公开(公告)日：1997-03-12

申请号：EP96111778.5

申请日：1996-07-22

Applicant: CATERPILLAR INC.

Inventor： Childress, Dale B. ,  Manring, Noah D.

IPC: F04B49/08

CPC classification number: F04B49/08 ,  F04B2201/1202 ,  F04B2201/1204

Abstract: A pump displacement control (10) for a variable displacement pump (11) includes a torque control valve (26) disposed between a variable torque limiter (34) and a force applying device (60) disposed in axial alignment within a common bore (19). A sleeve (27) and a valve spool (29) are movable relative to each other to establish a first condition communicating discharge pressure into an actuator chamber (17) to move a swashplate (12) toward a minimum displacement position against the bias of a spring (16) or a second condition communicating the actuating chamber with an exhaust passage (23) to allow the spring to move the swashplate toward its maximum displacement position. A torque control piston (39) disposed between opposing springs (48,49) resiliently bias the valve spool in a direction to establish the second condition when control fluid is directed into a control chamber (46). Pump discharge pressure communicated into a pressure chamber (63) exerts a force against the valve spool proportional to the discharge pressure so that the valve spool moves in a second direction to establish the first condition when the control force exceeds the biasing force exerted by the torque limiter.

Abstract translation: 泵包括设置在可变扭矩限制器和在公共孔内轴向对准设置的施力装置之间的扭矩控制阀。 套管和阀芯可相对于彼此移动以建立将排放压力连通到致动器室中的第一状态，以克服弹簧的偏压将斜盘朝向最小位移位置移动，或者将致动腔与排气连通的第二状态 通道以允许弹簧将斜盘移向其最大位移位置。 设置在相对弹簧之间的扭矩控制活塞在控制流体被引导到控制室中时沿一个方向弹性地偏压阀芯以建立第二状态。 连通到压力室的泵排出压力与排出压力成比例地施加抵靠阀芯的力，使得阀芯在第二方向上移动，以在控制力超过扭矩限制器施加的偏压力时建立第一状态。