公开(公告)号：US20180347598A1

公开(公告)日：2018-12-06

申请号：US15528024

申请日：2016-02-22

Applicant: KAWASAKI JUKOGYO KABUSHIKI KAISHA

Inventor： Akihiro KONDO ,  Hideyasu MURAOKA ,  Hiroaki FUJIMOTO

IPC: F15B11/17 ,  E02F9/22 ,  E02F3/42 ,  E02F9/12

CPC classification number: F15B11/17 ,  E02F3/425 ,  E02F9/123 ,  E02F9/22 ,  E02F9/2228 ,  E02F9/2285 ,  E02F9/2292 ,  E02F9/2296 ,  F15B11/00 ,  F15B2211/20546 ,  F15B2211/20576 ,  F15B2211/255 ,  F15B2211/2656 ,  F15B2211/513 ,  F15B2211/6309 ,  F15B2211/6316 ,  F15B2211/6652 ,  F15B2211/6653 ,  F15B2211/7053 ,  F15B2211/7058 ,  F15B2211/7135 ,  F15B2211/78

Abstract: An object to reduce a relief amount at the start of turning. A hydraulic drive system of a construction machine includes: a turning control valve disposed on a first circulation line extending from a first pump; a boom control valve disposed on a second circulation line extending from a second pump; first and second regulators, which change tilting angles of the first and second pumps; and a controller, which controls one or more solenoid proportional valves, which output a secondary pressure to the first and second regulators. While a turning operation is being performed, if a discharge pressure of the first pump is higher than a first setting value and a discharge pressure of the second pump is lower than a second setting value, the controller lowers first and second horsepower control lines that restrict discharge flow rates of the first and second pumps.

公开(公告)号：US09976549B2

公开(公告)日：2018-05-22

申请号：US14126526

申请日：2012-05-11

Applicant: Karsten Mueller ,  Volker Schueren ,  Dieter Holl ,  Bernd Spatz ,  Dirk-Walter Herold ,  Wolfgang Haug ,  Eberhard Schemm

Inventor： Karsten Mueller ,  Volker Schueren ,  Dieter Holl ,  Bernd Spatz ,  Dirk-Walter Herold ,  Wolfgang Haug ,  Eberhard Schemm

IPC: F04B49/20 ,  F15B11/00 ,  H02P6/08 ,  H02P23/20 ,  H02P25/024

CPC classification number: F04B49/20 ,  F15B11/00 ,  F15B2211/20515 ,  F15B2211/275 ,  F15B2211/6309 ,  H02P6/08 ,  H02P23/20 ,  H02P25/024

Abstract: A method is used to control a torque of an electric motor of an electro-hydraulic system. The method includes selecting a value of a set point torque depending on a current pressure in a hydraulic circuit of the electro-hydraulic system. The method also includes determining a control signal for controlling the torque of the electric motor using a target torque and the set point torque.

公开(公告)号：US09945441B2

公开(公告)日：2018-04-17

申请号：US15124866

申请日：2015-10-08

Applicant: KYB Corporation

Inventor： Takayuki Ogawa

IPC: F16F9/19 ,  B61F5/24 ,  F16F9/49 ,  F16F9/58 ,  F15B11/00 ,  F15B11/10 ,  F16F9/20 ,  F16F9/50

CPC classification number: F16F9/19 ,  B61F5/24 ,  F15B11/00 ,  F15B11/10 ,  F16F9/20 ,  F16F9/49 ,  F16F9/50 ,  F16F9/58 ,  F16F2222/12 ,  F16F2228/066 ,  F16F2230/22

Abstract: A cylinder device includes a recess provided on either one of the piston and the cylinder, the recess facing the other one of the piston and the cylinder; an extension-side discharge passage configured to permit only a flow of liquid from the extension-side chamber toward the recess; a compression-side discharge passage configured to permit only a flow of liquid from the compression-side chamber toward the recess; a tank-side discharge passage configured to allow the extension-side discharge passage and the compression-side discharge passage to communicate with the tank through the recess; an extension-side damping force generation passage configured to apply a resistance to a flow of liquid passing therethrough so as to exert a damping force during extension; and a compression-side damping force generation passage configured to apply a resistance to a flow of liquid passing therethrough so as to exert a damping force during contraction.

公开(公告)号：US20170268540A1

公开(公告)日：2017-09-21

申请号：US15504864

申请日：2015-08-28

Applicant: HITACHI CONSTRUCTION MACHINERY CO., LTD.

Inventor： Hidekazu MORIKI ,  Shinya IMURA ,  Tsutomu UDAGAWA ,  Ryohei YAMASHITA ,  Kouji ISHIKAWA

IPC: F15B11/16 ,  E02F3/32 ,  F15B11/17 ,  E02F9/22 ,  F15B11/10

CPC classification number: F15B11/161 ,  E02F3/32 ,  E02F9/0883 ,  E02F9/22 ,  E02F9/2267 ,  E02F9/2271 ,  E02F9/2292 ,  F15B11/00 ,  F15B11/10 ,  F15B11/17 ,  F15B2211/20576 ,  F15B2211/455 ,  F15B2211/605 ,  F15B2211/6346

Abstract: A work machine including a specific actuator that supplies hydraulic fluid from a plurality of hydraulic pumps includes: first and second hydraulic pumps communicating with a first hydraulic actuator; a first control valve returning hydraulic fluid delivered by the first hydraulic pump to a tank; and a load detection section that detects a load on the first hydraulic actuator. A control valve drive section drives the first control valve such that a communication area between the first hydraulic pump and the tank is enlarged corresponding to an increase in the load on the first hydraulic actuator; and a flow rate control section, during supply of the hydraulic fluid from the first and second hydraulic pumps to the first hydraulic actuator, controls to reduce a delivery flow rate of the first hydraulic pump corresponding to an increase in the load on the first hydraulic actuator.

公开(公告)号：US3522817A

公开(公告)日：1970-08-04

申请号：US3522817D

申请日：1968-09-18

Applicant: INT BASIC ECONOMY CORP

Inventor： RAYMOND ROBERT E

IPC: F15B11/00 ,  F15B21/00 ,  F16K17/10

CPC classification number: F15B21/00 ,  F15B11/00 ,  F15B2211/205 ,  F15B2211/50536 ,  F15B2211/513 ,  F15B2211/5157 ,  F15B2211/522 ,  F15B2211/528 ,  F15B2211/56 ,  Y10T137/7764 ,  Y10T137/7782

公开(公告)号：US3391767A

公开(公告)日：1968-07-09

申请号：US51915666

申请日：1966-01-06

Applicant: INT HARVESTER CO

Inventor： STOW ROBIN J W C

IPC: F15B11/00 ,  F16D48/02 ,  F16H57/04 ,  F16H61/02 ,  F16H63/30

CPC classification number: F16H57/0434 ,  F15B11/00 ,  F15B2211/20538 ,  F15B2211/30525 ,  F15B2211/31541 ,  F15B2211/50518 ,  F15B2211/5157 ,  F15B2211/55 ,  F15B2211/555 ,  F16D48/0206 ,  F16D2048/0242 ,  F16D2048/0269 ,  F16D2048/029 ,  F16H61/0262 ,  F16H63/3026 ,  F16H2708/06 ,  Y10T74/19433

公开(公告)号：US3180076A

公开(公告)日：1965-04-27

申请号：US27178463

申请日：1963-04-09

Applicant: MOTCH MERRYWEATHER MACHINERY

Inventor： JONES ALVIN J ,  PIRMAN ANTON E

IPC: B23B25/02 ,  B23B29/12 ,  B23B47/34 ,  B23Q5/26 ,  F15B11/00 ,  F15B21/12

CPC classification number: B23Q5/266 ,  B23B25/02 ,  B23B29/125 ,  B23B47/34 ,  F15B11/00 ,  F15B21/12 ,  Y10T408/23

公开(公告)号：USRE25700E

公开(公告)日：1964-12-15

申请号：US25700D

IPC: F15B11/00

CPC classification number: F15B11/00

公开(公告)号：US3150857A

公开(公告)日：1964-09-29

申请号：US5629760

申请日：1960-09-15

Applicant: MOLLOY MFG COMPANY

Inventor： MOLLOY BRIAN J

IPC: F15B11/00

CPC classification number: F15B11/00 ,  Y10T137/87764

公开(公告)号：US2933105A

公开(公告)日：1960-04-19

申请号：US54788755

申请日：1955-11-07

Applicant: BORG WARNER

Inventor： JERMAN JOSEPH A

IPC: A01F15/06 ,  F15B11/00

CPC classification number: F15B11/00 ,  A01F15/06 ,  F15B2211/30525 ,  F15B2211/329 ,  F15B2211/50518 ,  Y10T137/87193 ,  Y10T137/87225