专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明专利

IN178649B A brake valve for hydraulic motor for use in a power shovel or the like 未知
公开(公告)号：IN178649B
公开(公告)日：1997-05-31
申请号：IN117CA1993
申请日：1993-02-23
申请人： HITACHI CONSTRUCTION MACHINERY
发明人： SATO HIROSHI , KANNO YUKIO
IPC分类号： F15C3/00

2. 发明专利

DE69231963T2 未知
公开(公告)号：DE69231963T2
公开(公告)日：2001-11-15
申请号：DE69231963
申请日：1992-09-29
申请人： HITACHI CONSTRUCTION MACHINERY
发明人： SATO HITOSHI , KANNO YUKIO
IPC分类号： F15B13/02 , F15B11/00 , F16K17/06
摘要： A brake valve in which relief valves (59A, 59B) are prevented from relieving at a low pressure when an actuator is activated and responsiveness and safety thereof is improved. In this brake valve, the relief valves (59A, 59B) and check valves (70A, 70B) are disposed substantially coaxially with each other, and the check valves (70A, 70B) are seated on the leading end side of valve seat members (62A, 62B) when they are opened, whereby communication between inlet side passages (56A, 56B) and the valve seat members (62A, 62B) is substantially cut off. Therefore, when the check valves (70A, 70B) are opened when the actuator is activated, only pressure oil restricted through notched portions (73A, 73B) is fed into the valve seat members (62A, 62B), and the relief valves (59A, 59B) do not perform relieving at a low pressure. As a result of this, pressure oil from a hydraulic pump is fed quickly into a hydraulic motor via respective inlet and outlet passages (9, 10) without creating reduction in the pressure thereof.

3. 发明专利

DE69231963D1 未知
公开(公告)号：DE69231963D1
公开(公告)日：2001-08-30
申请号：DE69231963
申请日：1992-09-29
申请人： HITACHI CONSTRUCTION MACHINERY
发明人： SATO HITOSHI , KANNO YUKIO
IPC分类号： F15B13/02 , F15B11/00 , F16K17/06
摘要： A brake valve in which relief valves (59A, 59B) are prevented from relieving at a low pressure when an actuator is activated and responsiveness and safety thereof is improved. In this brake valve, the relief valves (59A, 59B) and check valves (70A, 70B) are disposed substantially coaxially with each other, and the check valves (70A, 70B) are seated on the leading end side of valve seat members (62A, 62B) when they are opened, whereby communication between inlet side passages (56A, 56B) and the valve seat members (62A, 62B) is substantially cut off. Therefore, when the check valves (70A, 70B) are opened when the actuator is activated, only pressure oil restricted through notched portions (73A, 73B) is fed into the valve seat members (62A, 62B), and the relief valves (59A, 59B) do not perform relieving at a low pressure. As a result of this, pressure oil from a hydraulic pump is fed quickly into a hydraulic motor via respective inlet and outlet passages (9, 10) without creating reduction in the pressure thereof.

你已经成功收藏专利！

检索式保存成功!

IPRDB