公开(公告)号：US12117025B2

公开(公告)日：2024-10-15

申请号：US17698391

申请日：2022-03-18

Applicant: James D. Rosplock

Inventor： James D. Rosplock

IPC: F15B15/14 ,  F15B21/0423 ,  F16J1/00 ,  F16J10/02 ,  F16J15/16 ,  F15B15/28

CPC classification number: F15B15/1485 ,  F15B15/1442 ,  F15B15/1461 ,  F15B15/1466 ,  F16J1/008 ,  F16J10/02 ,  F16J15/162 ,  F15B15/1452 ,  F15B15/149 ,  F15B15/2815 ,  F15B21/0423

Abstract: Disclosed are seal arrangements in a hydraulic device. The seal arrangement includes a seal channel defining a loop. A seal is seated within the seal channel. A coolant flow passage has a first part intersecting with the seal channel at a first point and a second part intersecting with the seal channel at a second point. The first part of the coolant flow passage is configured to provide hydraulic fluid to the seal channel such that, at the first point, a first portion of the hydraulic fluid flows in a first direction around the loop and a second portion of the hydraulic fluid flows in a second direction opposite to the first direction around the loop. At the second point, the first portion of hydraulic fluid and the second portion of hydraulic fluid are configured to flow into the second part of the coolant flow passage.

公开(公告)号：US12110913B2

公开(公告)日：2024-10-08

申请号：US17497579

申请日：2021-10-08

Applicant: The Boeing Company

Inventor： Neal Van Huynh

IPC: F15B13/04 ,  B64C13/40 ,  B64C13/50 ,  F15B13/043 ,  F15B13/044 ,  F15B21/00 ,  F15B21/0423 ,  F15B21/0427

CPC classification number: F15B13/0407 ,  F15B13/0436 ,  F15B13/044 ,  F15B21/008 ,  F15B21/0423 ,  F15B21/0427 ,  B64C13/40 ,  B64C13/50 ,  B64C13/504 ,  F15B2211/526 ,  F15B2211/528 ,  F15B2211/6303 ,  F15B2211/6336 ,  F15B2211/634

Abstract: Electro-hydraulic servo-valves and related methods are disclosed herein. An example electro-hydraulic servo-valve includes an inlet to receive a fluid from a reservoir, a torque motor, a chamber, the fluid to return to the reservoir via the chamber, and a flexure tube coupled to the torque motor. At least a portion of the flexure tube is disposed in the chamber. The flexure tube includes a nozzle to deliver the fluid to an actuator. The example electro-hydraulic servo-valve includes a damper operatively coupled to the flexure tube. The damper is disposed in the chamber.

公开(公告)号：US11971099B2

公开(公告)日：2024-04-30

申请号：US17947393

申请日：2022-09-19

Applicant: Hamm AG

Inventor： Thomas Klein ,  Ronny Pieske

IPC: F16H61/4104 ,  E01C19/26 ,  F16H61/4139 ,  F16H61/4148 ,  F16H61/4165 ,  E02F9/22 ,  F15B21/00 ,  F15B21/041 ,  F15B21/0423 ,  F15B21/045

CPC classification number: F16H61/4104 ,  E01C19/26 ,  F16H61/4139 ,  F16H61/4148 ,  F16H61/4165 ,  E02F9/2278 ,  F15B21/005 ,  F15B21/041 ,  F15B21/0423 ,  F15B21/045 ,  F15B2211/611 ,  F15B2211/6343

Abstract: A soil processing machine includes a hydraulic drive system including an electrohydraulic pressurized fluid source with at least one electric motor and at least one hydraulic drive pump, a hydraulic drive circuit fed with pressurized fluid by the at least one hydraulic drive pump, at least one hydraulic drive motor fed with pressurized fluid from the hydraulic drive circuit, and a discharge valve assembly for discharging fluid from the hydraulic drive circuit to a fluid reservoir. The hydraulic drive system is designed to operate the discharge valve assembly as a function of at least one of the following parameters: a temperature of the fluid in the hydraulic drive circuit, an ambient temperature, a viscosity of the fluid in the hydraulic drive circuit, a degree of contamination of the fluid in the hydraulic drive circuit, a period of time since the last start-up of the hydraulic drive system, a period of time since the last fluid was discharged from the hydraulic drive circuit.

公开(公告)号：US11719265B2

公开(公告)日：2023-08-08

申请号：US17320480

申请日：2021-05-14

Applicant: Caterpillar Inc.

Inventor： Gustaf Andrew Johnson ,  Pengfei Ma ,  Jordan Garrity

IPC: F15B21/0423 ,  E02F9/22

CPC classification number: F15B21/0423 ,  E02F9/226 ,  E02F9/2267

Abstract: A work machine includes a frame, a traction system supporting the frame, an implement system supported by the frame, and a hydraulic system. The hydraulic system includes a hydraulic oil tank, a control circuit, an oil cooler, and a cooler bypass valve assembly. The cooler bypass valve assembly is connected to the control circuit by a control circuit return line, and includes an unloading valve configured to allow hydraulic oil to flow from the control circuit return line to the hydraulic oil tank if a pressure of hydraulic oil in the control circuit return line exceeds a first threshold, a backpressure valve configured to allow hydraulic oil to flow from the return line to the oil cooler through an oil cooler inlet line if a pressure of hydraulic in the oil control circuit return line exceeds a second threshold, and an orifice configured to limit the flow of hydraulic oil through the backpressure valve.

公开(公告)号：US11454335B2

公开(公告)日：2022-09-27

申请号：US17186147

申请日：2021-02-26

Applicant: Hamilton Sundstrand Corporation

Inventor： Marcin Cis ,  Piotr Sawicki

IPC: F16K49/00 ,  F16K31/06 ,  F28F13/06 ,  F15B21/04 ,  F15B13/043 ,  F15B21/0423

Abstract: The present disclosure provides a heat exchanger system for a servovalve, comprising a base comprising a supply port in fluid communication with a return port, a first passage for fluid connection to a source of cooling fluid, and a second passage in fluid communication with the return port. The system further comprises one or more pipes located over a surface of the base, the one or more pipes fluidly connected between the first passage and the second passage, such that in use cooling fluid may flow from the first passage to the second passage via the network of pipes.

公开(公告)号：US11415156B2

公开(公告)日：2022-08-16

申请号：US17259488

申请日：2019-07-12

Applicant: SMS group GmbH

Inventor： Reiner Stammberger

IPC: G05D23/00 ,  F15B19/00 ,  F15B21/0423 ,  F28F27/00 ,  G06F1/20 ,  G06Q10/00

Abstract: A method for monitoring the condition of a hydraulic system of a metal forming plant is presented. The hydraulic system is coupled to or provided with a pump drivable by a drive motor for providing a working fluid and with a heat exchanger. With the presented method, the following steps are initiated or carried out by a condition-monitoring device during the operation of the hydraulic system: Determining a current cooling power of the heat exchanger; determining a current conveying power of the pump; and determining a current maintenance urgency and/or a current ageing condition of the hydraulic system on the basis of the determined current cooling power of the heat exchanger. Furthermore, a condition-monitoring device designed to carry out the presented method is presented.

公开(公告)号：US11353047B2

公开(公告)日：2022-06-07

申请号：US16848513

申请日：2020-04-14

Applicant: KUBOTA CORPORATION

Inventor： Yuji Fukuda ,  Kazuyoshi Arii ,  Hiroaki Nakagawa

IPC: F15B21/0423 ,  F15B13/042

Abstract: A hydraulic system for a work machine includes a tank to store an operation fluid, a hydraulic device to be operated by the operation fluid, a control valve to control the hydraulic device, a first fluid tube connecting the hydraulic device and the control valve, the first fluid tube being to supply the operation fluid from the control valve to the hydraulic device, a second fluid tube branching from the first fluid tube and connected to the tank, a switch valve provided to the second fluid tube, the switch valve being to control a flow rate of the operation fluid, and an oil cooler provided to the second fluid tube between the switch valve and the tank.

公开(公告)号：US11346375B2

公开(公告)日：2022-05-31

申请号：US16328591

申请日：2017-08-09

Applicant: Robert Bosch GmbH

Inventor： Andreas Guender ,  Jan Lukas Bierod ,  Rebecca Lacour ,  Mark-Patrick Muehlhausen ,  Carina Issinger ,  Ralf Maier ,  Rene Huettl

IPC: B01D19/00 ,  F28D1/053 ,  F15B1/26 ,  F15B21/0423 ,  F15B15/18 ,  F15B21/044 ,  F28D1/02

Abstract: A tank has an annular tank space, and a separating wall for separating an inflow connection from a drain connection is provided therein. Alternatively, or in addition thereto, a partition for degassing the oil in the tank is provided. Furthermore, alternatively or in addition thereto, at least one partition for extending a flow path of the oil is provided. It is also conceivable, alternatively or in addition thereto, to arrange a cooling device in the annular space.

公开(公告)号：US20210277918A1

公开(公告)日：2021-09-09

申请号：US16328591

申请日：2017-08-09

Applicant: Robert Bosch GmbH

Inventor： Andreas Guender ,  Jan Lukas Bierod ,  Rebecca Lacour ,  Mark-Patrick Muehlhausen ,  Carina Issinger ,  Ralf Maier ,  Rene Huettl

IPC: F15B1/26 ,  F15B15/18 ,  F15B21/044 ,  F15B21/0423

Abstract: A has having an annular tank space, and a separating wall for separating an inflow connection from a drain connection is provided therein. Alternatively, or in addition thereto, a partition for degassing the oil in the tank is provided. Furthermore, alternatively or in addition thereto, at least one partition for extending a flow path of the oil is provided. It is also conceivable, alternatively or in addition thereto, to arrange a cooling device in the annular space.

公开(公告)号：US11078936B2

公开(公告)日：2021-08-03

申请号：US16431192

申请日：2019-06-04

Applicant: The Boeing Company

Inventor： Chad Roderick Adamson ,  Charley Shin

IPC: F15B21/0423 ,  B64F5/00 ,  B64C9/00 ,  B64D33/02

Abstract: An external cooling system for hydraulic fluid of an aircraft hydraulic system. The external cooling system includes a heat exchanger, where an input side of the heat exchanger is connected to a hydraulic fluid reservoir of the aircraft hydraulic system and an output side of the heat exchanger is connected to suction ports of a return side of an electric motor driven pump (EMDP) of the aircraft hydraulic system. The external cooling system operates on 120 VAC power and the hydraulic fluid does not exceed a maximum pressure of 50 pounds per square inch gauge. The EMDP pumps hydraulic fluid through the hydraulic system under conditions wherein fuel tanks in the aircraft are empty, and the external cooling system cools the hydraulic fluid as the EMDP pumps the hydraulic fluid, wherein the hydraulic fluid passes from the hydraulic fluid reservoir and through the external cooling system before entering the EMDP.