WO2011038706A1 - Commande hydraulique - Google Patents

Commande hydraulique Download PDF

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Publication number
WO2011038706A1
WO2011038706A1 PCT/DE2010/001033 DE2010001033W WO2011038706A1 WO 2011038706 A1 WO2011038706 A1 WO 2011038706A1 DE 2010001033 W DE2010001033 W DE 2010001033W WO 2011038706 A1 WO2011038706 A1 WO 2011038706A1
Authority
WO
WIPO (PCT)
Prior art keywords
hydraulic
pump
accumulator
hydraulic control
pressure
Prior art date
Application number
PCT/DE2010/001033
Other languages
German (de)
English (en)
Inventor
Marco Grethel
Reinhard Stehr
Original Assignee
Schaeffler Technologies Gmbh & Co. Kg
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Schaeffler Technologies Gmbh & Co. Kg filed Critical Schaeffler Technologies Gmbh & Co. Kg
Priority to CN201080043577.0A priority Critical patent/CN102549272B/zh
Priority to DE112010003851T priority patent/DE112010003851A5/de
Publication of WO2011038706A1 publication Critical patent/WO2011038706A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F15B1/027—Installations or systems with accumulators having accumulator charging devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/02—Stopping, starting, unloading or idling control
    • F04B49/03—Stopping, starting, unloading or idling control by means of valves

Definitions

  • the invention relates to a hydraulic control with a pressure accumulator which is filled by means of an electrically driven pump via a storage charging valve which is connected between the pump and the pressure accumulator.
  • the invention further relates to a hydraulic system with such a hydraulic control.
  • the hydraulic control may also be referred to as a storage loading system.
  • the accumulator charging valve can be designed as a check valve, which prevents undesired backflow of hydraulic medium from the pressure accumulator to the pump or into a tank with hydraulic medium.
  • the electric motor used to drive the pump when switching on, so when starting the pump not only accelerate the masses at rest, but also overcome a hydraulic load, which essentially consists of a residual storage pressure and consequent opening pressure of Accumulator charging valve results.
  • the object of the invention is to improve a hydraulic control according to the preamble of claim 1 with regard to the manufacturing costs and / or the energy consumption during operation of the pump, in particular when starting the pump.
  • the object is achieved in a hydraulic control with a pressure accumulator, which is filled by means of an electrically driven pump via a storage charging valve which is connected between the pump and the pressure accumulator, characterized in that the pump is followed by a hydraulic relief device, which the pump at startup hydraulically relieved.
  • a hydraulic control with a pressure accumulator, which is filled by means of an electrically driven pump via a storage charging valve which is connected between the pump and the pressure accumulator, characterized in that the pump is followed by a hydraulic relief device, which the pump at startup hydraulically relieved.
  • the resulting load torque of the pump is not negligible compared with the starting torque from the inertia.
  • the resulting load torque may require high motor currents when starting the pump and may affect the startup of the pump.
  • the hydraulic load to be overcome by the electric motor when the pump starts up can be significantly reduced.
  • the electric motor for driving the pump can be made smaller than conventional hydraulic controls.
  • a preferred embodiment of the hydraulic control is characterized in that the hydraulic relief device is designed so that the pump is relieved at least one start-up rotation.
  • the hydraulic relief device is preferably effective only during a very short period of time when starting the pump. After a few start-up revolutions of the pump, the effect of the hydraulic relief device can be eliminated or switched off.
  • a further preferred embodiment of the hydraulic control is characterized in that the hydraulic relief device is designed so that the pump promotes when starting against a start-up pressure, which is significantly lower than the pressure, in particular the normal operating pressure, in the pressure accumulator.
  • a further preferred embodiment of the hydraulic control is characterized in that the hydraulic relief device comprises a hydraulic starting capacity, which is connected between the accumulator charging valve and the pressure accumulator.
  • a hydraulic capacity a hydraulic volume is referred to, which is variable, for example by moving a piston. More specifically, the hydraulic capacity is a proportionality factor resulting from the ratio of a compression fluid flow to a pressure change rate.
  • a further preferred embodiment of the hydraulic control is characterized in that the hydraulic starting capacity comprises a spring-loaded piston, a low pressure accumulator, a diaphragm, a plate spring and / or a Dehnschlauch.
  • the hydraulic starting capacity can be represented, for example, by a cylinder filled with hydraulic medium, the volume of which is limited by the spring-loaded piston, the diaphragm or the expansion hose.
  • a further preferred embodiment of the hydraulic control is characterized in that the hydraulic relief device comprises a start-up valve which is connected between the pump and the pressure accumulator.
  • the hydraulic relief device comprises a start-up valve which is connected between the pump and the pressure accumulator.
  • the start-up valve is combined with the accumulator charging valve in a start-up accumulator charging valve device.
  • the start-up accumulator charging valve device according to the invention fulfills the function of the conventional accumulator charging valve.
  • the start-up accumulator charging valve device according to the invention makes it possible to start the pump against a start-up pressure which is significantly lower than the respective accumulator pressure in the accumulator.
  • a further preferred embodiment of the hydraulic control is characterized in that the start-up accumulator charging valve device is designed as a 3/2-way valve with a connection for the pump, a connection for the pressure accumulator and a connection for a tank for hydraulic medium.
  • the start-up accumulator charging valve device is designed as a 3/2-way valve with a connection for the pump, a connection for the pressure accumulator and a connection for a tank for hydraulic medium.
  • a further preferred embodiment of the hydraulic control is characterized in that the hydraulic relief device is designed as a differential pressure-controlled bypass valve.
  • the bypass valve allows a low volume flow without pressure loss or with a low pressure drop over a metering orifice.
  • the invention also relates to a hydraulic system with such a hydraulic control for driving a transmission, which is preferably designed as a continuously variable conical-pulley transmission.
  • the invention further relates to a method for driving such a transmission.
  • FIG. 2 shows a similar hydraulic system as in FIG. 1 with a start-up accumulator charging valve device which is designed as a directional control valve and FIG
  • Figure 3 shows a similar hydraulic system as in Figure 2, wherein the start-up accumulator charging valve device is designed as a differential pressure controlled bypass valve.
  • FIG. 1 to 3 is a hydraulic system 1; 21; 31 with a hydraulic control 2; 22; 32 shown in three different embodiments, each in the form of a hydraulic circuit diagram. To designate the same parts, the same reference numerals are used.
  • the hydraulic control 2; 22; 32 includes a pressure accumulator 4, to which a consumer 5 is connected.
  • the consumer 5 is, for example, at least one adjusting cylinder of a continuously variable conical-disk drive transmission.
  • the pressure accumulator 4 is filled via a connecting line 8 by means of a pump 0, which is driven by an electric machine, in particular an electric motor 12, from a tank 14 with hydraulic medium.
  • the hydraulic medium is, for example, hydraulic oil which is subjected to ambient pressure in the tank 14 or is depressurized.
  • a designed as a check valve accumulator charging valve 16 is connected between the pump 10 and the pressure accumulator 4.
  • the accumulator charging valve 16 can only be flowed through in one flow direction and prevents undesired backflow of hydraulic medium from the pressure accumulator 4 or from the load 5 to the outlet of the pump 10.
  • a hydraulic relief device 18 is connected according to an essential aspect of the invention, which is executed in the embodiment shown in Figure 1 as a hydraulic starting capacity 19.
  • the hydraulic start-up capacity 19 includes an additional volume of hydraulic fluid, for example, a spring-loaded piston, a diaphragm, a plate spring or a stretch tube is limited.
  • the hydraulic starting capacity 19 can also be designed as a low-pressure accumulator, that is to say as a gas pressure accumulator with a piston or bladder.
  • a start-up accumulator charging valve 26 is connected between the pump 10 and the pressure accumulator 4.
  • the start-up accumulator charging valve 26 is designed as a 3/2-way valve 27 with three connections and two switching positions.
  • the 3/2-way valve 27 includes a first port for the pump 10, a second port for the pressure accumulator 4 and a third port for the tank 14.
  • the control of the 3/2-way valve 27 is preferably carried out electromagnetically.
  • the pump 10 is connected via an additional discharge line 29 to the tank 14 in connection.
  • a hydraulic relief device 28 is provided, which allows a virtually pressureless or pressureless starting of the pump 10.
  • the 3/2-way valve 27 is switched to its second switching position, not shown, in which the output of the pump 10 is in communication with the pressure accumulator 4.
  • a hydraulic relief device 38 is connected between the output of the pump 10 and the accumulator charging valve 16.
  • the hydraulic relief device 38 comprises a bypass valve 39 which communicates with the tank 14 via a bypass line 40.
  • the bypass valve 39 is actuated via a control line 41.
  • the bypass valve 39 is preceded by a metering orifice 42, which allows a very small volume flow with a low pressure drop from the pump 10 into the tank 14, whereby the startup behavior of the pump 10 is significantly improved.

Abstract

La présente invention concerne une commande hydraulique comportant un accumulateur de pression (4) qui est rempli au moyen d'une pompe électrique (10) par l'intermédiaire d'un clapet de charge d'accumulateur (16) monté entre la pompe et l'accumulateur de pression. L'invention se distingue en ce qu'un dispositif de décharge hydraulique (18) monté en aval de la pompe effectue une décharge hydraulique de celle-ci lors de sa mise en marche.
PCT/DE2010/001033 2009-09-29 2010-09-02 Commande hydraulique WO2011038706A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201080043577.0A CN102549272B (zh) 2009-09-29 2010-09-02 液压控制装置
DE112010003851T DE112010003851A5 (de) 2009-09-29 2010-09-02 Hydraulische steuerung

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009043647 2009-09-29
DE102009043647.2 2009-09-29

Publications (1)

Publication Number Publication Date
WO2011038706A1 true WO2011038706A1 (fr) 2011-04-07

Family

ID=43357146

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2010/001033 WO2011038706A1 (fr) 2009-09-29 2010-09-02 Commande hydraulique

Country Status (3)

Country Link
CN (1) CN102549272B (fr)
DE (2) DE102010036166A1 (fr)
WO (1) WO2011038706A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3462028A1 (fr) * 2017-10-02 2019-04-03 Deere & Company Syst?me hydraulique

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106949102A (zh) * 2017-02-17 2017-07-14 成都捷冠科技有限公司 一种用于轻钢龙骨加工的液压蓄能设备

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5989802A (ja) * 1982-11-12 1984-05-24 Hitachi Ltd 液圧発生装置
DE68901843T2 (de) * 1988-10-04 1993-01-14 Peugeot Sicherheitssystem fuer eine elektropumpe.
GB2296046A (en) * 1994-10-18 1996-06-19 Automotive Products Plc Hydraulic actuation system for vehicle clutches

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2072546U (zh) * 1990-07-10 1991-03-06 李建启 可回收制动能量的液压挖掘机回转系统
CN201095777Y (zh) * 2007-01-23 2008-08-06 浙江工业大学 一种用于均衡内燃机输出扭矩的液压装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5989802A (ja) * 1982-11-12 1984-05-24 Hitachi Ltd 液圧発生装置
DE68901843T2 (de) * 1988-10-04 1993-01-14 Peugeot Sicherheitssystem fuer eine elektropumpe.
GB2296046A (en) * 1994-10-18 1996-06-19 Automotive Products Plc Hydraulic actuation system for vehicle clutches

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3462028A1 (fr) * 2017-10-02 2019-04-03 Deere & Company Syst?me hydraulique
US10731670B2 (en) 2017-10-02 2020-08-04 Deere & Company Hydraulic arrangement

Also Published As

Publication number Publication date
DE112010003851A5 (de) 2012-09-06
CN102549272A (zh) 2012-07-04
CN102549272B (zh) 2015-11-25
DE102010036166A1 (de) 2011-03-31

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