公开(公告)号：US20170190249A1

公开(公告)日：2017-07-06

申请号：US15325104

申请日：2015-06-24

Applicant: KYB Corporation

Inventor： Takanori INADA ,  Tetsuya IWANAJI

IPC: B60K17/10 ,  F15B13/02 ,  F16H61/478 ,  F16H39/02 ,  F16H61/4017 ,  F16H61/4061 ,  F15B11/17 ,  F15B13/06

CPC classification number: B60K17/10 ,  F15B11/17 ,  F15B13/027 ,  F15B13/06 ,  F15B2211/20576 ,  F15B2211/25 ,  F16H39/02 ,  F16H61/4017 ,  F16H61/4061 ,  F16H61/478

Abstract: A hydraulic drive system includes: a first hydraulic motor and a second hydraulic motor configured to be driven by working oils respectively discharged from a first hydraulic pump and a second hydraulic pump; a first pump control unit and a second pump control unit configured to control discharge volumes and discharge directions of the first hydraulic pump and the second hydraulic pump; a signal pressure generating unit configured to generate a signal pressure for adjusting command pressures to control the first pump control unit and the second pump control unit in accordance with the sum of discharge pressures of the first hydraulic pump and the second hydraulic pump; and a first pressure adjusting unit and a second pressure adjusting unit configured to adjust the command pressures in accordance with the signal pressure.

公开(公告)号：US20170164599A1

公开(公告)日：2017-06-15

申请号：US15118109

申请日：2014-10-17

Applicant: KYB Corporation

Inventor： Tatsuo ITO ,  Takanori INADA ,  Takanobu YOSHIDA ,  Tomomichi MIZUKAMI ,  Atsushi OOTA ,  Masaki AKASHI ,  Yasuo TANAKA ,  Hiroki TOKUDA

IPC: A01M7/00 ,  B05B13/00 ,  A01G25/09

CPC classification number: A01M7/0053 ,  A01G25/09 ,  B05B13/005

Abstract: A boom damping device includes a fluid pressure cylinder configured to perform an expansion/contraction operation in conjunction with rotational movement of a boom in a roll direction of a working vehicle, a first pressure accumulator into/out of which an operating fluid flows through a first passage with the expansion/contraction operation of the fluid pressure cylinder, a second pressure accumulator into/out of which the operating fluid flows through a second passage with the expansion/contraction operation of the fluid pressure cylinder, and a shut-off switch configured to shut off the first passage and configured to shut off the second passage if at least either one of a right boom and a left boom is not at a working position expanded in a right-and-left direction of the working vehicle.

公开(公告)号：US20200011308A1

公开(公告)日：2020-01-09

申请号：US16482484

申请日：2018-03-13

Applicant: KYB Corporation

Inventor： Takanori INADA

IPC: F04B1/32 ,  F04B1/20 ,  F15B7/00

Abstract: A servo regulator includes a servo piston coupled with a swash plate, a pressure chamber provided to face an end portion of the servo piston, a spool configured to control a pressure in the pressure chamber by being moved by a solenoid, a biasing member configured to bias the spool against a thrust of the solenoid, and a feedback portion configured to change a biasing force of the biasing member in accordance with tilting of the swash plate, wherein the feedback portion is coupled with the swash plate via the servo piston.

公开(公告)号：US20200032778A1

公开(公告)日：2020-01-30

申请号：US16491404

申请日：2018-03-13

Applicant: KYB Corporation

Inventor： Takanori INADA

IPC: F04B1/26 ,  F15B13/043 ,  F16H61/431

Abstract: A servo regulator includes servo piston, a first pressure chamber and a second pressure chamber, a spool, a biasing member provided on an outer periphery of the spool and configured to bias the spool, a first support portion configured to support one end portion of the biasing member when the spool is moved to a first direction where the pressure in the first pressure chamber is raised, and a second support portion configured to support other end portion of the biasing member when the spool is moved to a second direction where the pressure in the second pressure chamber is raised, wherein at least one of the first support portion and the second support portion is detachably provided on the spool.