US20020029801A1 - Relief valve - Google Patents

Relief valve Download PDF

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Publication number
US20020029801A1
US20020029801A1 US09/930,242 US93024201A US2002029801A1 US 20020029801 A1 US20020029801 A1 US 20020029801A1 US 93024201 A US93024201 A US 93024201A US 2002029801 A1 US2002029801 A1 US 2002029801A1
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US
United States
Prior art keywords
orifice
movable member
relief valve
flowrate control
circumferential surface
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.)
Abandoned
Application number
US09/930,242
Other languages
English (en)
Inventor
Maoying Guo
Hideki Tsuchiya
Kiyokazu Nagata
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.)
KYB Corp
Original Assignee
Kayaba Industry 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
Priority claimed from JP2000275215A external-priority patent/JP3502820B2/ja
Application filed by Kayaba Industry Co Ltd filed Critical Kayaba Industry Co Ltd
Assigned to KAYABA INDUSTRY CO., LTD. reassignment KAYABA INDUSTRY CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: TSUCHIYA, HIDEKI, GUO, MAOYING, NAGATA, KIYOKAZU
Publication of US20020029801A1 publication Critical patent/US20020029801A1/en
Priority to US10/441,068 priority Critical patent/US6675823B2/en
Abandoned legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
    • F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
    • F04C14/24—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves
    • F04C14/26—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves using bypass channels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K15/00—Check valves
    • F16K15/02—Check valves with guided rigid valve members
    • F16K15/04—Check valves with guided rigid valve members shaped as balls
    • F16K15/044—Check valves with guided rigid valve members shaped as balls spring-loaded
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
    • F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
    • F16K17/0406—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded in the form of balls
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
    • F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
    • F16K17/0433—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded with vibration preventing means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/30—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
    • F04C2/34—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members
    • F04C2/344—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member
    • F04C2/3446—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member the inner and outer member being in contact along more than one line or surface
    • 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
    • Y10T137/2574—Bypass or relief controlled by main line fluid condition
    • Y10T137/2579—Flow rate responsive
    • Y10T137/2582—Including controlling main line flow
    • 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
    • Y10T137/2574—Bypass or relief controlled by main line fluid condition
    • Y10T137/2579—Flow rate responsive
    • Y10T137/2589—Pilot valve operated
    • 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
    • Y10T137/7722—Line condition change responsive valves
    • Y10T137/7837—Direct response valves [i.e., check valve type]
    • Y10T137/785—With retarder or dashpot
    • Y10T137/7852—End of valve moves inside dashpot chamber
    • 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
    • Y10T137/7722—Line condition change responsive valves
    • Y10T137/7837—Direct response valves [i.e., check valve type]
    • Y10T137/7904—Reciprocating valves
    • Y10T137/7922—Spring biased
    • Y10T137/7927—Ball valves
    • Y10T137/7928—With follower

Definitions

  • This invention relates to a relief valve.
  • JP-A-H8-42513 published in 1996 by the Japanese Patent Office discloses a relief valve included in the flow control valve of a power steering device.
  • FIG. 10 shows this flow control valve 200 .
  • a relief valve 250 is incorporated in a spool 201 of the flow control valve 200 , as shown in the diagram.
  • Oil supplied to a supply chamber 202 at the tip of the spool 201 from the pump port P is supplied to the power steering device via an orifice 203 and an oil supply port 204 .
  • the oil pressure on the side of the oil supply port 204 (oil pressure downstream of the orifice 203 ) is introduced to a flowrate control spring chamber 205 at the base end of the spool 201 .
  • the spool 201 displaces under a balance between a thrust force due to the oil pressure of the supply chamber 202 and the supply port 204 (oil pressure both upstream and downstream of the orifice 203 ), and a reaction due to the spring force of a spring 206 provided in the flow rate control spring chamber 205 and the oil pressure of the flowrate control spring chamber 205 .
  • this relief valve 250 in a transient state when the movable members are pushed open, noise is produced by chattering which makes the operation of the movable members unstable. If the diameter of a seat orifice 255 is reduced, this chattering can be suppressed, but in this case pressure losses increase, and override characteristics of the relief valve 250 (characteristics of the difference between a set pressure and a cracking pressure) are impaired. It is therefore an object of this invention to stabilize the operation of movable members, prevent chattering and improve override characteristics in a relief valve.
  • this invention provides a relief valve, comprising a valve seat comprising a seat hole, a ball which opens and closes the seat hole from the downstream side, a movable member which supports the ball from the downstream side, a housing part which houses the movable member, and an orifice formed downstream of the seat hole which damps the vibration of the movable member and suppresses chattering by restricting an oil flow.
  • this invention provides a flowrate control valve which controls the flowrate supplied from a pump to a load circuit comprising a relief valve, the relief valve comprising a valve seat having a seat hole, a ball which opens and closes the seat hole from the downstream side, a movable member which supports the ball from the downstream side, a housing part which houses the movable member, and an orifice formed downstream of the seat hole which damps the vibration of the movable member 4 and suppresses chattering by restricting an oil flow.
  • the relief valve opens when the pressure on the load circuit side rises, and part of the fluid from the pump is discharged to a tank port.
  • FIG. 1 is a cross-sectional diagram of a vane pump in which the relief valve of this invention is applied.
  • FIG. 2 is a cross-sectional view through a line A-A in FIG. 1.
  • FIG. 3 is a cross-sectional view of a flowrate control valve and relief valve.
  • FIG. 4 is similar to FIG. 3, but showing a second embodiment of this invention.
  • FIG. 5A is a cross-sectional view of a relief valve according to a third embodiment of this invention.
  • FIG. 5B is a cross-sectional view through a line B-B in FIG. 5A.
  • FIG. 6A is a cross-sectional view of a relief valve according to a fourth embodiment of this invention.
  • FIG. 6B is a cross-sectional view through a line C-C in FIG. 6A.
  • FIG. 7 is similar to FIG. 3, but showing a fifth embodiment of this invention.
  • FIG. 8 is similar to FIG. 3, but showing a sixth embodiment of this invention.
  • FIG. 9 is similar to FIG. 3, but showing a seventh embodiment of this invention.
  • FIG. 10 shows the prior art.
  • the relief valve of this invention is incorporated in a flowrate control valve which controls the oil flowrate to a power steering device from a vane pump.
  • FIG. 1, FIG. 2 show the construction of a vane pump 20 .
  • the construction of the vane pump is common to each embodiment.
  • the vane pump 20 comprises a body 21 , cover 22 , shaft 23 , rotor 24 , cam ring 25 and side plate 26 .
  • the shaft 23 is a drive shaft of the rotor 24 installed in the body 21 , and is supported free to rotate in the body 21 .
  • the shaft 23 is connected to the engine of a vehicle, not shown, and rotates together with the rotation of the engine.
  • the rotor 24 is disposed on the inside of the cam ring 25 which has an elliptical inner wall. The rotor 24 is gripped between the cover 22 and the side plate 26 .
  • Plural vanes 27 are arranged radially on the outer circumference of the rotor 25 .
  • the vanes 27 can move into or out of the rotor 24 .
  • the vanes 27 protrude until their ends come in contact with the inner circumferential surface of the cam ring 25 . Due to this, a pump chamber is formed between each of the vanes 27 , this chamber expanding and contracting together with the rotation of the rotor 24 .
  • FIG. 3 shows the construction of the flowrate control valve 30 according to the first embodiment of this invention, and a relief valve 1 built into the flowrate control valve 30 .
  • the flowrate control valve 30 comprises a spool 40 housed free to slide in a slide hole 31 formed in the body 21 of the vane pump 20 .
  • a connector 32 is screwed into the open end of the slide hole 31 .
  • the hollow part of the connector 32 is an oil supply port 32 A for supplying oil to the power steering device, not shown.
  • a plug 33 is fitted to the base of the connector 32 .
  • a hole is formed in the plug 33 .
  • a shaft member 41 of the spool 40 passes through this hole, and a gap between the outer circumference of the shaft member 41 and the inner circumference of the hole forms an orifice 33 A.
  • the opening area of the orifice 33 A can be varied by the shaft member 41 of the spool 40 in this way, but the member which varies the opening area of this orifice 33 A may be separated from the flowrate control valve 30 , and the member which varies the opening area of the orifice 33 A may be driven by a solenoid. In this way, the opening area of the orifice 33 A can be controlled more precisely.
  • the oil supply port 32 A (downstream of the orifice 33 A) communicates with a flowrate control spring chamber 35 via a communicating passage 37 .
  • An orifice 38 is provided between the communicating passage 37 and the oil supply port 32 A, and an orifice 39 is provided between the communicating passage 37 and flowrate control spring chamber 35 .
  • a contact step part 42 is formed at the base end of the shaft member 41 of the spool 40 .
  • the diameter of the contact step part 42 is larger than the diameter of the opening of the plug 33 .
  • a sliding part (land part) 43 is formed at the base end of the contact step part 42 of the spool 40 .
  • the sliding part 43 slides along the inner circumferential surface of the slide hole 31 .
  • the inside of the slide hole 31 is divided into a supply chamber 34 (upstream of the orifice 33 A) at the tip end of the spool 40 (left-hand side of the figure), and the flowrate control spring chamber 35 at the base end of the spool 40 (the right-hand side of the figure), by this sliding part 43 .
  • the base end from the sliding part 43 of the spool 40 is a base end part 44 of smaller diameter than the sliding part 43 .
  • a flowrate control spring 36 is disposed on the outer circumference of this base end part 44 .
  • the base end of the flowrate control spring 36 comes in contact with the base of the slide hole 31 , and the flowrate control spring 36 pushes the spool 40 in the direction of the tip end (left-hand side of the figure).
  • a pressure port P which communicates with the high-pressure passage 29 of the vane pump 20 and a tank port T which communicates with a tank, open onto the side face of the slide hole 31 .
  • the pump port P is situated near the open end of the slide hole 31 , and communicates with the supply chamber 34 .
  • the tank port T is situated on the far inside (right-hand side of the figure) of the slide hole from the pump port P, and communication and non-communication with the supply chamber 34 , and the communicating area when they do communicate, may be changed over by the displacement of the spool 40 .
  • the relief valve 1 is built into the spool 40 from the side of the flowrate control spring chamber 35 .
  • the relief valve 1 is used as a pilot valve when pressure control is performed in the flowrate control valve 30 .
  • the flowrate control valve 30 also functions as a pressure control valve which decreases the supply pressure from the vane pump 20 .
  • the relief valve 1 is a valve which is built into the spool 40 of the flowrate control valve 30 functions as a valve which controls the flowrate control valve 30 when the pressure of the oil supply port 32 A increases.
  • the relief valve 1 comprises a return spring 3 , ball support member 4 , ball 5 , valve seat 6 and sleeve member 7 built into the valve hole 2 which opens onto the base end of the spool 40 .
  • the sleeve member 7 is fixed to the inner circumferential surface at the open end of the valve hole 2 .
  • the valve seat 6 is fixed to an inner circumferential surface 7 A of the sleeve member 7 .
  • a seat orifice 6 A is formed coaxially with the valve seat 6 , and a downstream end part of this seat orifice 6 A forms a seat hole 6 B.
  • a filter 8 is attached to the open end (upstream of the seat orifice 6 A) of the valve hole 2 .
  • the ball 5 and ball support member 4 are disposed downstream of the valve seat 6 (left-hand side of FIG. 3).
  • a return spring 3 is provided on the outer circumference of the ball support member 4 .
  • the return spring 3 disposed between a flange 4 A of the ball support member 4 and the base surface of the valve hole 2 , pushes the ball support member 4 in the direction of the valve seat 6 .
  • the ball 5 is supported by the ball support member 4 , and is pushed against the seat hole 6 B of the valve seat 6 by the spring force of the return spring 3 so as to seal the seat hole 6 B.
  • a fluid pressure in the flowrate control spring chamber 35 of the flowrate control valve 30 exceeds the spring pressure of the return spring 3 , the ball 5 is pushed open, and oil is introduced into the valve hole 2 from the seat orifice 6 A and seat hole 6 B.
  • the flange 4 A is formed at the base end of the ball support member 4 .
  • the flange 4 A divides the inside of the valve hole 2 into a chamber 9 and a pressure control spring chamber 10 .
  • a gap 11 is formed as an orifice between the flange 4 A and the inner circumferential surface 7 A of the sleeve member 7 which extends to the side of the flange 4 A.
  • the gap 11 is a gap which is sufficiently narrow to have a sufficient damping effect on the movement of the ball support member 4 , and its width in the radial direction is preferably set to below ⁇ fraction (1/20) ⁇ of the inner diameter of the sleeve member 7 .
  • the pressure control spring chamber 10 communicates with the tank port T via plural oil passages 12 and an outer circumferential groove 13 .
  • the outer circumferential groove 13 is an annular groove formed on the outer circumference of a slide part 43 of the spool 40 .
  • the vane pump 20 rotates according to the engine rotation, and oil is supplied to the supply chamber 34 of the flowrate control valve 30 from the pump port P. This oil flows into the oil supply port 32 A via the orifice 33 A, and is supplied to the power steering device.
  • the oil supply amount supplied to the power steering device is small at low pump rotation speeds, the oil supply amount increases in direct proportion to the pump rotation speed.
  • the differential pressure between the supply chamber 34 (upstream of the orifice 33 A) and the oil supply port 32 A (downstream of the orifice 33 A) is determined by the opening area of the orifice 33 A and the flowrate passing through the orifice 33 A, and it increases as the rotation speed of the vane pump 20 rises and the flowrate flowing through the orifice 33 A increases.
  • Oil is led to the pressure control spring chamber 35 of the flowrate control valve 30 via the orifice 38 , oil passage 37 and orifice 39 .
  • the spool 40 displaces in the base end direction (right-hand side of the figure) against the flowrate control spring 36 .
  • the supply chamber 34 communicates with the tank port T. Hence, part of the oil supplied from the pump port P is discharged to the tank port T, and increase of the oil supply amount supplied to the power steering device is suppressed even if the pump rotation speed rises. Further, when the large diameter part 41 A of the spool 40 moves inside the orifice 33 A, the opening area of the orifice 33 A becomes narrow, and the oil supply amount supplied to the power steering device is further suppressed. In this way, the oil supply amount to the power steering device is controlled according to the pump rotation speed.
  • the pressure of the supply chamber 34 is controlled as follows. For example, when the pressure of the oil supply port 32 A increases sharply due to a kickback or the like from the power steering device, this pressure is transmitted to the flowrate control spring chamber 35 via the orifice 38 , oil passage 37 and orifice 39 . Hence, the pressure of the flowrate control spring chamber 35 increases, and when it exceeds the set pressure of the relief valve 1 , the relief valve 1 is pushed open, and the flowrate control spring chamber 35 and tank port T are made to communicate.
  • the ball 5 and ball support member 4 are pushed open against the spring force of the return spring 3 , and oil in the flowrate control spring chamber 35 is discharged to the tank port T via the filter 8 , the seat orifice 6 A, the seat hole 6 B, a chamber 9 , the gap 11 which functions as an orifice, a pressure control spring chamber 10 , an oil passage 12 and the outer circumferential groove 13 .
  • the pressure of the flowrate control spring chamber 35 decreases, and the spool 40 retreats toward the right of the figure.
  • the supply pressure of the supply chamber 34 is discharged to the tank port T, and is controlled so that it does not become excessive.
  • the opening area of the orifice 33 A is made narrower by the large diameter part 41 A, and the flowrate flowing into the power steering device is limited.
  • the relief valve 1 functions in this way in pressure control, but according to this embodiment, the gap 11 is formed between the flange 4 A and the inner circumferential surface 7 A of the sleeve member 7 . Therefore, due to the resistance (pressure loss) and damping force when oil passes through this gap 11 , override is improved, the operation of the ball support member 4 is stabilized, and chattering is suppressed. Specifically, vibration of the ball support member 4 in the side and axial directions is suppressed, and noise accompanying this vibration is prevented.
  • FIG. 4 shows a second embodiment
  • the second embodiment is different from the first embodiment in the following points.
  • the sleeve member 7 of the second embodiment is shorter than that of the first embodiment, and it does not extend to the side of the flange 4 A of the ball support member 4 . Instead, a guide depression 62 A is formed in a valve hole 2 on the side of the flange 4 A, and a gap 63 between the flange 4 A and guide depression 62 A functions as an orifice.
  • the gap 63 is sufficiently narrow to have a sufficient damping effect on the movement (vibration) of the ball support member 4 , and the width in the radial direction is preferably set to less than ⁇ fraction (1/20) ⁇ of the inner diameter of the depression 62 A.
  • the gap 63 may be formed between the flange 4 A and the inner circumferential surface of the valve hole 2 which does not have a depression.
  • FIG. 5A shows the relief valve 1 according to a third embodiment.
  • FIG. 5B shows a cross-sectional view through a line B-B in FIG. 5A.
  • the third embodiment is different from the first embodiment in the following points. Also in the third embodiment, the relief valve 1 is built into the spool 40 of the flowrate control valve 30 as in the case of the aforesaid first embodiment.
  • the flange 4 A of the ball support member 4 is made wider in the axial direction, and its outer circumferential surfaces slides on the inner circumferential surface 7 A of the sleeve member 7 .
  • Plural grooves 73 (in this embodiment, four notches provided at 90 degree intervals) are formed extending in the axial direction of the ball support member 4 , and these grooves 73 function as orifices.
  • the grooves 73 are set to a width and depth at which sufficient damping effect can be exerted on the movement (vibration) of the ball support member 4 .
  • the grooves 73 are formed by cutting notches out of the outer circumferential surface of the flange 4 A, so they are easily formed, precise machining is easy, and precision of the damping force setting is enhanced. Further, as the grooves 73 are formed on the outer circumferential surface of the flange 4 A, they are not sealed off by the edges of the return spring 3 . In this embodiment, the grooves 73 are formed in the outer circumference of the flange 4 A, but they may be formed in the inner circumference 7 A of the sleeve member 7 .
  • FIG. 6A shows a fourth embodiment.
  • FIG. 6B shows a vertical cross-sectional through a line C-C of FIG. 6A.
  • the fourth embodiment differs from the first embodiment in the following points. Also in the fourth embodiment, the relief valve 1 is built into the spool 40 of the flowrate control valve 30 .
  • the flange 4 A of the ball support member 4 is made wider in the axial direction, and its outer circumferential surfaces slides completely on the inner circumferential surface 7 A of the sleeve member 7 .
  • Plural depressions 83 which open onto the pressure control spring chamber 10 are formed in the outer circumferential surface of the flange 4 A.
  • holes 84 which axially pass through the flange 4 A are provided in the inner part of the depressions 83 .
  • These throughholes 84 function as orifices.
  • the cross-sectional areas of the throughholes 84 are set to a size such that a sufficient damping effect on the movement (vibration) of the ball support member 4 is obtained.
  • the throughholes 84 Due to the throughholes 84 , an identical effect is obtained in the fourth embodiment as in the first embodiment. Further, the flange 4 A comes in contact with the inner circumferential surface 7 A of the sleeve member 7 , so vibration of the ball support member 4 in the side direction is completely prevented.
  • the orifice is formed as the throughholes 84 which pass through the flange 4 A, so it can be easily formed, precise machining is easy, and the precision of the damping force setting is enhanced. Further, the throughholes 84 are formed inside the depression parts 83 , so even if the return spring 3 is installed at the end of the flange 4 , they are not sealed off by the end of the return spring 3 .
  • FIG. 7 shows a fifth embodiment.
  • the fifth embodiment differs from the first embodiment in the following points. The remaining features of the construction are identical.
  • the pressure control spring chamber 10 and outer circumferential groove 13 communicate not through the oil passage 12 but through an orifice 93 .
  • FIG. 8 shows a sixth embodiment.
  • a notch-shaped orifice 103 is formed on the outer circumference of the flange 4 A.
  • the flange 4 A of the ball support member 4 slides on the inner circumferential surface 7 A of the sleeve member 7 , and the notch-shaped orifice 103 is formed on the outer circumference of the flange 4 A.
  • the cross-sectional area of the orifice 103 is set to a size such that a sufficient damping effect is given to the movement (vibration) of the ball support member 4 .
  • the pressure control valve chamber 10 and outer circumferential groove 13 communicate via an orifice 104 . Due to this construction, vibration of the ball support member 4 in the side direction is more definitely prevented.
  • FIG. 9 shows a seventh embodiment.
  • the construction of the relief valve 1 is identical to that of the first embodiment, however the opening area of an orifice 118 between the pump port P and an oil supply port 120 which supplies oil to the power steering device is made variable by a solenoid valve 110 , unlike the first embodiment.
  • the spool 40 of the flowrate control valve 20 comprises an end part 46 of small diameter situated at the end of the sliding part 43 which slides in the slide hole 31 .
  • the pump port P opens onto the side of this end part 46 .
  • the tank port T opens onto the side of the slide part 43 , and opens onto the end part 46 when the spool 14 has retracted so that part of the fluid from the pump port P is discharged to the tank port T.
  • the solenoid valve 110 is disposed between the oil supply port 120 which communicates with the power steering device, and the pump port P.
  • the solenoid valve 110 comprises a fixed iron core 112 which has a coil 111 on the outer circumference, and a rod 114 which has a movable iron core on the outer circumference.
  • the rod 114 is supported free to slide in an axial direction via bearings 115 , 116 , and is driven by energizing the coil 111 .
  • the end part of the rod 114 engages with the opening of a seat 117 .
  • the outer circumferential part of this rod 114 and the seat 117 form an orifice 118 , the opening area of the orifice 118 being varied by the retraction of the rod 114 .
  • the orifice downstream of the seat hole of the relief valve may be provided in another way.
  • the relief valve was applied to a flowrate control valve of a vane pump supplying oil pressure to the power steering device, but the invention is not limited to this arrangement, and may be applied to a relief valve used for any application.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Safety Valves (AREA)
  • Power Steering Mechanism (AREA)
US09/930,242 2000-09-11 2001-08-16 Relief valve Abandoned US20020029801A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US10/441,068 US6675823B2 (en) 2000-09-11 2003-05-20 Relief valve

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2000275215 2000-09-11
JP2000275215A JP3502820B2 (ja) 2000-05-18 2000-09-11 リリーフ弁

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US10/441,068 Division US6675823B2 (en) 2000-09-11 2003-05-20 Relief valve

Publications (1)

Publication Number Publication Date
US20020029801A1 true US20020029801A1 (en) 2002-03-14

Family

ID=18760871

Family Applications (2)

Application Number Title Priority Date Filing Date
US09/930,242 Abandoned US20020029801A1 (en) 2000-09-11 2001-08-16 Relief valve
US10/441,068 Expired - Lifetime US6675823B2 (en) 2000-09-11 2003-05-20 Relief valve

Family Applications After (1)

Application Number Title Priority Date Filing Date
US10/441,068 Expired - Lifetime US6675823B2 (en) 2000-09-11 2003-05-20 Relief valve

Country Status (5)

Country Link
US (2) US20020029801A1 (ko)
KR (1) KR20020020852A (ko)
CN (1) CN1258052C (ko)
DE (1) DE10144641B4 (ko)
FR (1) FR2813937B1 (ko)

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* Cited by examiner, † Cited by third party
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US20150183459A1 (en) * 2012-09-13 2015-07-02 Trw Automotive U.S. Llc Power steering apparatus
US9315208B2 (en) * 2012-09-13 2016-04-19 Trw Automotive U.S. Llc Power steering apparatus

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EP1734295B1 (en) * 2005-06-15 2008-12-24 Bosch Rexroth Oil Control S.p.A. A valve for progressive braking
CN100344903C (zh) * 2005-08-16 2007-10-24 浙江大学 一种油脂集中润滑***的溢流阀
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US8506270B2 (en) * 2009-12-15 2013-08-13 Hitachi Automotive Systems, Ltd. Variable displacement vane pump
CN102444733B (zh) * 2011-12-14 2015-01-07 四川省机械研究设计院 一种自缓冲多级安全阀
JP6302735B2 (ja) * 2014-04-24 2018-03-28 Ｋｙｂ株式会社 リリーフ弁
JP6082788B2 (ja) * 2015-07-31 2017-02-15 Ｋｙｂ株式会社 複合弁及びそれを用いた双方向流制御弁
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CN110985714A (zh) * 2019-11-28 2020-04-10 北京卫星制造厂有限公司 一种uhplc液相泵超高压高精度单向阀
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US20150183459A1 (en) * 2012-09-13 2015-07-02 Trw Automotive U.S. Llc Power steering apparatus
US9315208B2 (en) * 2012-09-13 2016-04-19 Trw Automotive U.S. Llc Power steering apparatus
US9616920B2 (en) * 2012-09-13 2017-04-11 Trw Automotive U.S. Llc Power steering apparatus

Also Published As

Publication number Publication date
CN1258052C (zh) 2006-05-31
US6675823B2 (en) 2004-01-13
US20030196697A1 (en) 2003-10-23
FR2813937A1 (fr) 2002-03-15
CN1343847A (zh) 2002-04-10
KR20020020852A (ko) 2002-03-16
DE10144641B4 (de) 2014-04-30
FR2813937B1 (fr) 2005-04-22
DE10144641A1 (de) 2002-06-06

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