US3749112A - Backpressure generating apparatus in an oil pressure operated circuit - Google Patents

Backpressure generating apparatus in an oil pressure operated circuit Download PDF

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Publication number
US3749112A
US3749112A US00211938A US3749112DA US3749112A US 3749112 A US3749112 A US 3749112A US 00211938 A US00211938 A US 00211938A US 3749112D A US3749112D A US 3749112DA US 3749112 A US3749112 A US 3749112A
Authority
US
United States
Prior art keywords
passage
oil
valve member
pressure
throttle
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Lifetime
Application number
US00211938A
Other languages
English (en)
Inventor
M Nishikawa
A Akima
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Honda Motor Co Ltd
Original Assignee
Honda Motor Co Ltd
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 Honda Motor Co Ltd filed Critical Honda Motor Co Ltd
Application granted granted Critical
Publication of US3749112A publication Critical patent/US3749112A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/505—Pressure control characterised by the type of pressure control means
    • F15B2211/50509—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means
    • F15B2211/50545—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using braking valves to maintain a back pressure
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/515—Pressure control characterised by the connections of the pressure control means in the circuit
    • F15B2211/5157—Pressure control characterised by the connections of the pressure control means in the circuit being connected to a pressure source and a return line
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/515—Pressure control characterised by the connections of the pressure control means in the circuit
    • F15B2211/5159—Pressure control characterised by the connections of the pressure control means in the circuit being connected to an output member and a return line
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/52—Pressure control characterised by the type of actuation
    • F15B2211/528—Pressure control characterised by the type of actuation actuated by fluid pressure
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/56—Control of an upstream pressure
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/80—Other types of control related to particular problems or conditions
    • F15B2211/86—Control during or prevention of abnormal conditions
    • F15B2211/8609—Control during or prevention of abnormal conditions the abnormal condition being cavitation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/2496—Self-proportioning or correlating systems
    • Y10T137/2544—Supply and exhaust type
    • Y10T137/2554—Reversing or 4-way valve systems
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/2496—Self-proportioning or correlating systems
    • Y10T137/2559—Self-controlled branched flow systems
    • Y10T137/2562—Dividing and recombining

Definitions

  • ABSTRACT A backpressure generating apparatus in an oil pressureoperated circuit in which an oil supply circuit and an oil return circuit are formed between an oil pressure source and an oil pressure-operated device and supply of oil to the device is regulated by a control valve interposed in the circuits; a no-load passage and a throttle passage are interposed in the oil return circuit in parallel with one another, such that the no-load passage is open during ordinary operation when the oil is at low pressure when the device is not operated, whereas when a high pressure is generated in the oil supply circuit during operation of the device, the no-load passage is closed by the action of the high pressure and the oil is by-passed through the throttle passage.
  • An orifice is interposed in the oil supply circuit to heat the oil when the pressure is high due to cold operation conditions.
  • An object of this invention is to provide backpressure generating apparatus free from the foregoing disadvantage and it is characterized in that, in an oil pressure operated circuit of the type in which an oil supply circuit and an oil return circuit are formed between an oil pressure source (such as an oil pressure pump) and an oil pressure-operated device (such as an oil pressure cylinder) and a control valve is interposed therein, a no-load passage and a throttle passage are interposed in the oil return circuit in parallel with one another, the arrangement being such that the no-load passage is open during ordinary operating conditions but when a high pressure is generated in the oil supply passage the no-load passage is closed by the action of this high pressure.
  • an oil pressure operated circuit of the type in which an oil supply circuit and an oil return circuit are formed between an oil pressure source (such as an oil pressure pump) and an oil pressure-operated device (such as an oil pressure cylinder) and a control valve is interposed therein, a no-load passage and a throttle passage are interposed in the oil return circuit in parallel with one another, the arrangement being such that
  • This apparatus can also be used to raise the oil temperature when it is low and the oil viscosity is high, for example, at the time of starting in winter, and for this purpose an orifice is interposed in the oil supply circuit.
  • FIG. 1 is a diagrammatic illustration showing one embodiment of this invention
  • FIG. 2 is a sectional view taken along line II II in FIG. 1;
  • FIG. 3 is a detail view showing a modified embodiment thereof.
  • the drawing shows an oil pressure-operated circuit for a power cylinder in a power steering apparatus.
  • numeral ll denotes an oil pressure pump and numeral 2 denotes an oil tank connected to the negative pressure side thereof.
  • An oil supother side operating position the pressure oil within the oil supply circuit 5 is supplied to one side chamber 3a of the power cylinder 3 or to the other side chamber 3b, while at its neutral position there is formed a shortcircuit condition wherein the oil within the supply circuit 5 is merely returned to the return circuit 4 without being supplied to the cylinder 3.
  • Numeral 8 denotes a pressure governing valve interposed between the two circuits 5 and 6.
  • the no-load passage 9 comprises a valve opening 9a with a slide valve 9b therein for opening and closing the opening 9a.
  • the slide valve 9b is urged by a spring 9c to the left to open the valve opening 911.
  • the other end of the valve 9b faces an oil pressure chamber 9d branched off the oil supply circuit 5, so that when a high pressure is produced within the passage 5, the valve 9b is moved to the right against the action of spring 9c to close the valve opening 9a.
  • the throttle passage 10 in FIGS. 1 and 2 comprises a valve opening 10a and a slide valve 10b slidably mounted therein.
  • the valve ltlb is urged by a spring to the left in the drawing so as to close the valve opening 10a.
  • the valve 10b has at the left end portion thereof several peripheral chamfered portions 10d as shown clearly in FIG. 2, so that when the valve 9b is closed and consequently a rise in oil pressure is produced in front of the valve 10b, the valve 10b is displaced to the right so that the chamfered portions 10d become positioned within the valve opening 10a and thereby the interior of the valve opening 10a is formed as a throttle opening defined by the chamfered portions 10d.
  • the oil within the oil supply circuit 5 is merely sent to the oil return circuit 6 through a short-circuit passage within the valve 4 and a large pressure is not produced within the circuit 5, so that the valve 9b within the no-load passage 9 is positioned at the illustrated left position so as to fully open the valve opening 9a, whereby the return oil is returned to the tank 2 therethrough. If, then the control valve 4 is moved in one direction or the other, the oil within the oil supply circuit 5 is supplied to one side chamber, for example, 3a of the power cylinder 3 and, at the same time, the oil within the other chamber 3b is returned to the tank 2 from the return circuit 6 through the valve 4.
  • the oil supply circuit 5 becomes pressurized, whereby the valve 9b in the no-load passage 9 is displaced to the right to close the valve opening 9a and, at the same time, the valve 10b in the throttle passage 10 is displaced by the pressure on its front surface to retract to form a plurality of throttle openings at valve opening 10a. Accordingly, the return oil returning through the return circuit 6 is subjected to flow resistance at throttle passage 10 and thereby a backpressure is generated within the return circuit 6 Thus, the generation of cavitation phenomenon as mentioned before can be prevented.
  • FIG. 3 shows a modified embodiment.
  • the throttle passage 10 is formed by the valve opening 10a and the slide valve 10b mounted in the valve opening 10a as described before, the throttle passage is formed of only a single narrow opening 10'. Almost the same purpose can be achieved thereby.
  • a throttle is automatically formed within the return circuit so as to generate a backpressure therein and thereby avoid the creation of cavitation phenomenon and the corresponding generation of noise caused thereby. Additionally, when the control valve is inoperative, the throttle for generating the backpressure is automatically removed and the power loss and other disadvantages inherent in conventional apparatus with a permanent throttle member are eliminated.
  • the oil supply circuit 5 is provided with an orifice 11 in the region of the juncture of circuit 5 and the oil pressure chamber 9d.
  • an increase in the oil temperature can be automatically effected only by the provision of the additional orifice l 1.
  • an improvement comprising means defining a no-load passage and a throttle passage in the return passage in parallel with one another, and operating means for maintaining the no-load passage open during ordinary operation in the hydraulic circuit when the liquid is at low pressure for closing said no-load passage to bypass the liquid through said throttle passage when the liquid pressure is increased, and a throttle orifice in said supply passage between the pressure source and the valve.
  • said operating means comprises a valve member in said no-load passage, spring means urging said valve member to a normal position in which the no-load passage is open, and passage means connecting said valve member with the supply passage such that when the pressure of the liquid rises in the supply passage, the valve member will be displaced thereby against the opposition of the spring means to a position in which the no-load passage is closed.
  • said throttle passage includes an opening, a second valve member in said opening, second spring means acting on the second valve member to urge the same to a normal position in which said opening is blocked, and means for subjecting the second valve member to the pressure of the liquid in the return passage to displace the second valve member against the opposition of the second spring means to an operative position in which said opening is open when the first valve member closes the no-load passage.
  • said portion of the second valve member includes at least one peripheral chamfer thereon to define said throttle channel in said opening when the second valve member is in operative position.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
US00211938A 1970-12-28 1971-12-27 Backpressure generating apparatus in an oil pressure operated circuit Expired - Lifetime US3749112A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP45119705A JPS4835669B1 (enrdf_load_stackoverflow) 1970-12-28 1970-12-28

Publications (1)

Publication Number Publication Date
US3749112A true US3749112A (en) 1973-07-31

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
US00211938A Expired - Lifetime US3749112A (en) 1970-12-28 1971-12-27 Backpressure generating apparatus in an oil pressure operated circuit

Country Status (2)

Country Link
US (1) US3749112A (enrdf_load_stackoverflow)
JP (1) JPS4835669B1 (enrdf_load_stackoverflow)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2829064A1 (de) 1978-07-01 1980-01-03 Zahnradfabrik Friedrichshafen Hilfskraftlenkung fuer kraftfahrzeuge
US4274326A (en) * 1979-02-28 1981-06-23 General Motors Corporation Hydraulic booster with back pressure control
US4285266A (en) * 1978-10-06 1981-08-25 Zahnradfabrik Friedrichshafen, Ag. Servo steering gear
US4291718A (en) * 1979-02-26 1981-09-29 Sanin Sergei A Pressure valve
US4429621A (en) 1977-11-24 1984-02-07 Cam Gears Limited Hydraulic systems
DE2857451C3 (de) * 1978-07-01 1987-01-22 Zahnradfabrik Friedrichshafen Ag, 7990 Friedrichshafen Hydraulische Hilfskraftlenkung für Kraftfahrzeuge
US4768604A (en) * 1987-07-06 1988-09-06 General Motors Corporation Power steering system
US20060037645A1 (en) * 2004-08-18 2006-02-23 Trw Automotive Gmbh Hydraulic power steering valve housing

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4429621A (en) 1977-11-24 1984-02-07 Cam Gears Limited Hydraulic systems
DE2829064A1 (de) 1978-07-01 1980-01-03 Zahnradfabrik Friedrichshafen Hilfskraftlenkung fuer kraftfahrzeuge
US4329912A (en) * 1978-07-01 1982-05-18 Zahnradfabrik Friedrichshafen, Ag. Auxiliary power steering for motor vehicles
DE2857451C3 (de) * 1978-07-01 1987-01-22 Zahnradfabrik Friedrichshafen Ag, 7990 Friedrichshafen Hydraulische Hilfskraftlenkung für Kraftfahrzeuge
US4285266A (en) * 1978-10-06 1981-08-25 Zahnradfabrik Friedrichshafen, Ag. Servo steering gear
US4291718A (en) * 1979-02-26 1981-09-29 Sanin Sergei A Pressure valve
US4274326A (en) * 1979-02-28 1981-06-23 General Motors Corporation Hydraulic booster with back pressure control
US4768604A (en) * 1987-07-06 1988-09-06 General Motors Corporation Power steering system
US20060037645A1 (en) * 2004-08-18 2006-02-23 Trw Automotive Gmbh Hydraulic power steering valve housing

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Publication number Publication date
JPS4835669B1 (enrdf_load_stackoverflow) 1973-10-30

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