公开(公告)号：US10648154B2

公开(公告)日：2020-05-12

申请号：US15908581

申请日：2018-02-28

Applicant: Deere & Company

Inventor： Grant R. Henn ,  Aaron R. Kenkel ,  Doug M. Lehmann

IPC: E02F3/42 ,  F15B11/04 ,  F15B19/00 ,  F15B13/042 ,  E02F3/28 ,  E02F9/22 ,  E02F3/34

Abstract: A method of controlling hydraulic fluid flow to an implement of a material handling vehicle includes coupling a boom arm to a vehicle frame for rotation about the vehicle frame, rotating a boom arm with respect to the vehicle frame with an actuator, coupling an attachment to the boom arm for rotation with respect to the boom arm, sensing a pressure of fluid in the actuator, communicating the sensed pressure to a control system, determining a baseline pressure of the attachment based upon the sensed pressure of the fluid in the actuator, and limiting fluid flow to the actuator with a control valve in response to the sensed pressure of the fluid in the actuator being above the baseline pressure.

公开(公告)号：US20200056632A1

公开(公告)日：2020-02-20

申请号：US16346384

申请日：2017-11-07

Applicant: SMC CORPORATION

Inventor： Hirosuke YAMADA ,  Seikai YO

IPC: F15B11/04 ,  F15B11/06

Abstract: A composite valve includes a valve body, a first valve module, and a second valve module. The valve body includes a first body portion to which the first valve module is attached, a second body portion to which the second valve module is attached, a third body portion that has an input port, and a fourth body portion that has an output port and an attachment portion. The first body portion and the second body portion respectively extend along a first axis and a second axis that are parallel to each other. The third body portion extends along a third axis that is at 90 degrees with respect to the first axis and with respect to the second axis. The fourth body portion extends along a fourth axis L4 that is at 90 degrees with respect to all the first axis, the second axis, and the third axis.

公开(公告)号：US10519725B2

公开(公告)日：2019-12-31

申请号：US16272626

申请日：2019-02-11

Applicant: Ensign Drilling Inc.

Inventor： Wayne D. Kipp ,  Ronald Pettapiece

IPC: E21B19/086 ,  F15B11/036 ,  F15B11/04 ,  F15B11/16 ,  F15B15/14

Abstract: An assembly for hoisting and lowering a drill string of a drilling rig includes a multiple displacement hydraulic cylinder having a blind end, a rod end, and a single piston rod configured for slidable extension and retraction movement within the interior space of the cylinder. The interior space is defined by three chambers, each chamber having a port allowing switchable flow of hydraulic fluid into and out from the cylinder. The assembly also includes a pumping and switching system with hydraulic fluid connections to each port of the cylinder. The pumping and switching system is configured to switch the direction of hydraulic fluid flow through each of the ports of the three chambers, thereby providing the assembly with a plurality of hydraulic fluid flow path combinations. Each flow path combination provides a different speed-to-force ratio for extending or retracting the piston rod, thereby hoisting or lowering the drill string.

公开(公告)号：US10480542B2

公开(公告)日：2019-11-19

申请号：US15903532

申请日：2018-02-23

Applicant: Aladdin Engineering and Manufacturing, Inc.

Inventor： Natalie E. Bell ,  Edward R. Horn ,  David M. Matz ,  Gregory F. Matz ,  Scott R. Jones ,  Edward C. Horn

IPC: F16K31/12 ,  F15B13/02 ,  F16K15/04 ,  F15B15/14 ,  F16K11/02 ,  F15B15/20 ,  F16K1/04 ,  F16K11/20 ,  F16K15/18 ,  F16K27/02 ,  F15B13/04 ,  F15B13/042 ,  F15B11/04

Abstract: A valve system for use with a cylinder having an extensible rod, includes a first valve assembly including a first inlet/outlet port, a check valve biased toward a closed state, the check valve having a check valve body at least partially receivable within a first port of the cylinder, a flow control valve positioned in series between the first inlet/outlet port and the check valve, and a first pilot port selectively communicable with a pressurized gas for opening the check valve. The valve system further includes a second valve assembly including a second inlet/outlet port, a second pilot port through which the pressurized gas must flow before being introduced to the first pilot port, and a valve body at least partially receivable within a second port of the cylinder, wherein the second inlet/outlet port and the second pilot port are integrally formed as a portion of the valve body.

公开(公告)号：US20190285093A1

公开(公告)日：2019-09-19

申请号：US16318937

申请日：2017-07-25

Applicant: KAWASAKI JUKOGYO KABUSHIKI KAISHA

Inventor： Hideyasu MURAOKA ,  Yoji YUDATE ,  Kazuya IWABE

IPC: F15B11/04 ,  E02F9/22 ,  G01C19/06

Abstract: A controller unit is included in a liquid-pressure driving system for use in a working machine configured to supply an operating liquid to an actuator to move a structural body by the actuator. The controller unit includes: a gyro sensor configured to output a signal corresponding to an operation velocity of the structural body; and a controller configured to control a flow rate of the operating liquid supplied to the actuator, based on the signal output from the gyro sensor and corresponding to the operation velocity of the structural body, wherein: the controller is attached to the structural body; and the gyro sensor is incorporated in the controller.

公开(公告)号：US10183852B2

公开(公告)日：2019-01-22

申请号：US15182875

申请日：2016-06-15

Applicant: DANFOSS POWER SOLUTIONS GMBH & CO OHG

Inventor： Abhijit Das ,  Lee Mahlum ,  Luke Wadsley ,  Richard Hitchcock ,  Jeffrey A. Sipila ,  Larry Joachim

IPC: F16K31/02 ,  B66F9/24 ,  B66F9/22 ,  F15B11/04 ,  F15B19/00 ,  F15B21/08 ,  E02F9/22

Abstract: A hydraulic control system that uses system pressure information and a rescaled operator input to command valve spool area to control actuator speed. The system uses soft sealing and/or soft pressure compensation.

公开(公告)号：US10030677B2

公开(公告)日：2018-07-24

申请号：US14913602

申请日：2014-08-21

Applicant: SMC CORPORATION

Inventor： Kenji Shishido

IPC: F15B11/04 ,  F16K15/00

CPC classification number: F15B11/0413 ,  F15B2211/8855 ,  F16K15/00 ,  Y10T137/7781

Abstract: Inside a valve housing equipped with a first flow path and a second flow path that connect in parallel with a first port and a second port, there are provided a needle valve body that opens/closes a throttle hole in the first flow path, a check valve that opens/closes the second flow path, and a piston that performs an open/close control of the needle valve body through the interaction of the pressure of a fluid introduced into a pressure chamber and the spring force of a compression spring. The needle valve body is formed at the tip of a rod coupled to the piston. Inside the rod and the needle valve body there is formed a conduction hole connecting the throttle hole and the pressure chamber.

公开(公告)号：US20180172030A1

公开(公告)日：2018-06-21

申请号：US15382066

申请日：2016-12-16

Applicant: Caterpillar Inc.

Inventor： Justian D. Reever ,  Darren J. Hopf ,  Timothy L. Hand

IPC: F15B11/04 ,  F01P7/04

CPC classification number: F15B11/04 ,  E02F9/2235 ,  E02F9/226 ,  E02F9/2267 ,  F01P5/043 ,  F01P7/044 ,  F01P2060/04 ,  F15B2211/275 ,  F15B2211/465

Abstract: A fan control system includes a tank, a pump, a hydraulic motor, a fan, and a control valve. The control valve is adapted to selectively direct a flow of hydraulic fluid from the pump through the control valve into a pressure control chamber of the hydraulic motor or from the pressure control chamber to the tank to vary the control pressure therein to move the hydraulic motor's swashplate between forward and reverse positions. The control valve is adapted to selectively direct hydraulic fluid from the pump into the pressure control chamber such that the control pressure therein is pressurized to an idle pressure to move the swashplate to an intermediate position between the forward and reverse positions such that the output shaft rotates at an idle rate which is less than the rotational speed of the output shaft when in the forward mode.

公开(公告)号：US09845812B2

公开(公告)日：2017-12-19

申请号：US14649598

申请日：2013-12-04

Applicant: ARBURG GMBH + CO. KG

Inventor： Herbert Kraibuhler ,  Eberhard Duffner

IPC: F15B11/04 ,  F15B21/08 ,  F16L55/04 ,  F15B21/00 ,  B29C45/82 ,  G05D16/20

CPC classification number: F15B11/04 ,  B29C45/82 ,  F15B21/008 ,  F15B21/08 ,  F15B2211/20515 ,  F15B2211/20538 ,  F15B2211/6309 ,  F15B2211/633 ,  F15B2211/6333 ,  F15B2211/6336 ,  F15B2211/6651 ,  F15B2211/6653 ,  F15B2211/8613 ,  F15B2211/8616 ,  F16L55/041 ,  G05D16/2066

Abstract: In a method for operating a hydraulic device for providing a supply to hydraulic consumers (V) on a plastics injection moulding machine, provision is made of a pump (10) with a volumetric delivery characteristic that results in cyclic pulsations and of a servomotor (11) with multiple poles that result in cyclic pulsations. The pressure at the hydraulic consumer (V) is detected and is input as an actual value into a pressure regulator (13) that readjusts the servomotor (11), on the basis of a predefined pressure profile, to a pressure setpoint value at the hydraulic consumer (V). The cyclic pressure pulsation is minimized in that, by means of a rotational angle sensor (20), the rotational angle (φ) of the pump (10) and/or of the servomotor (11) is detected and correlated with the cyclic pulsations, and in that, from this, a corrective value or a corrective function is determined and is transmitted to the pressure regulator (13) with control subordinate to the regulation of the pressure setpoint value. Alternatively or in addition, this is achieved in the case of a hydraulic device also in that, as corrective means for the pressure regulation, said means being subordinate to the consideration of the pulsations, the number of components of the pump (10) that result in the cyclic pulsations and the number of components of the servomotor (11) that generate cyclic pulsations are equal, or one is a multiple of the other.

公开(公告)号：US20170292243A1

公开(公告)日：2017-10-12

申请号：US15633916

申请日：2017-06-27

Applicant: SUMITOMO HEAVY INDUSTRIES, LTD.

Inventor： Junichi OKADA ,  Takumi ITOH

IPC: E02F3/43 ,  F15B11/04 ,  E02F3/32 ,  F15B11/028 ,  E02F9/22 ,  E02F9/20

Abstract: A construction machine includes a hydraulic cylinder configured to drive an attachment, a hydraulic circuit configured to supply hydraulic oil to the hydraulic cylinder, an input device that is operated by an operator, and a controller configured to control the hydraulic circuit in at least one of a first control mode where the attachment is caused to generate a force corresponding to an operation amount of the input device and a second control mode where the attachment is driven at a velocity corresponding to the operation amount of the input device.