公开(公告)号：US11466707B2

公开(公告)日：2022-10-11

申请号：US16967615

申请日：2019-04-23

Applicant: KYB Corporation

Inventor： Yusuke Takahashi ,  Takahiro Iwamoto ,  Keitaro Yoshida ,  Takayoshi Kikuchi

IPC: F15B20/00 ,  F15B15/14 ,  G01M3/26

Abstract: A fluid leakage detection system has a detection space to which working oil leaked out through a rod seal is guided; the rod seal being configured to seal an annular gap between a piston rod and a cylinder head; a sensor unit configured to detect pressure in the detection space; and a controller configured to acquire detected result from the sensor unit, wherein the controller has: a calculation unit configured to calculate a pressure parameter representing a pressure fluctuation in the detection space; a determination unit configured to determine occurrence of leakage of the working oil based on the pressure parameter; and the pressure parameter includes an upper limit value and a lower limit value of the pressure fluctuation obtained from the detected result detected by the sensor unit within a predetermined detection period.

公开(公告)号：USD951532S1

公开(公告)日：2022-05-10

申请号：US29671162

申请日：2018-11-23

Applicant: KYB Corporation

Designer： Yusuke Takahashi

公开(公告)号：US11225985B2

公开(公告)日：2022-01-18

申请号：US16961607

申请日：2019-01-18

Applicant: KYB Corporation

Inventor： Yusuke Takahashi

IPC: F15B15/14 ,  F16J15/3236

Abstract: A fluid leakage detection device includes: an annular member attached to a cylinder head, the annular member being configured such that a piston rod is inserted through the annular member; a passage formed in the annular member, the passage being configured such that a working fluid is guided to the passage from a gap between an outer circumference of the piston rod and an inner circumference of the cylinder head; and a detector configured to detect the working fluid guided through the passage, wherein the annular member includes a press-fitted portion, the press-fitted portion being configured to be press-fitted to an annular groove formed in the cylinder head.

公开(公告)号：US11499574B2

公开(公告)日：2022-11-15

申请号：US16961958

申请日：2019-01-16

Applicant: KYB Corporation

Inventor： Yusuke Takahashi

IPC: F15B15/14 ,  F15B20/00

Abstract: A fluid leakage detection device includes: a rod seal provided in a cylinder head, a rod seal being configured to seal an annular gap between a piston rod and the cylinder head; a detection seal configured to seal an annular gap, a detection seal being configured to partition the detection space together with the rod seal; a communication passage in communication with the detection space; a pressure sensor configured to detect the pressure of the working oil guided through the communication passage; and a relief valve configured to release the pressure in the communication passage, wherein the detection seal is provided between the rod seal and a dust seal, the dust seal being configured to seal the annular gap by being provided in the cylinder head so as to face the outside of the cylinder tube.