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WO2015178308A1 - Clapet antiretour - Google Patents

Clapet antiretour Download PDF

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Publication number
WO2015178308A1
WO2015178308A1 PCT/JP2015/064027 JP2015064027W WO2015178308A1 WO 2015178308 A1 WO2015178308 A1 WO 2015178308A1 JP 2015064027 W JP2015064027 W JP 2015064027W WO 2015178308 A1 WO2015178308 A1 WO 2015178308A1
Authority
WO
WIPO (PCT)
Prior art keywords
pressure valve
negative pressure
positive pressure
retaining member
spring
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.)
Ceased
Application number
PCT/JP2015/064027
Other languages
English (en)
Japanese (ja)
Inventor
弘晴 山口
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.)
Piolax Inc
Original Assignee
Piolax Inc
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 Piolax Inc filed Critical Piolax Inc
Priority to JP2016521076A priority Critical patent/JP6186504B2/ja
Publication of WO2015178308A1 publication Critical patent/WO2015178308A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
    • B60K15/03—Fuel tanks
    • B60K15/035—Fuel tanks characterised by venting means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • 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
    • 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
    • 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
    • F16K24/00—Devices, e.g. valves, for venting or aerating enclosures

Definitions

  • the present invention relates to a check valve for adjusting the pressure in a fuel tank of an automobile or the like.
  • Patent Document 1 As a conventional check valve of this type, the following Patent Document 1 is energized so as to contact the positive pressure valve seat by a casing having a positive pressure valve seat and a positive pressure valve seat.
  • a positive pressure valve having a through-passage, a negative pressure valve seat, and a negative pressure valve assembled to the positive pressure valve so as to open and close the negative pressure valve seat and biased to contact the negative pressure valve seat by a negative pressure valve spring
  • a check valve is described in which an inner cylinder in which the periphery of one end opening forms a negative pressure valve seat and an outer cylinder connected to the outer periphery via a rib are described.
  • the negative pressure valve has a head portion that contacts and separates from the negative pressure valve seat of the inner cylinder, a shaft portion that extends from the head portion and is inserted into the inner tube, and a negative projection that is formed at the tip of the shaft portion.
  • a retaining member having a pressure valve main body, a cylindrical portion through which the shaft portion is inserted, an engaging claw extending from the cylindrical portion and engaging with the engaging protrusion, and a spring support portion formed on the outer periphery of the cylindrical portion It consists of and. Further, a plurality of the engaging claws are extended from the base end side in the axial direction of the cylindrical portion toward the inner diameter direction and at equal intervals in the circumferential direction, and between the distal ends of the engaging claws. Is provided with a gap through which the shaft portion can be inserted.
  • the shaft portion of the valve body of the negative pressure valve is inserted into the inner cylinder of the positive pressure valve, the engaging projection is projected from the back side of the inner cylinder, and one end of the spring for the negative pressure valve is supported in the inner cylinder of the positive pressure valve.
  • the plurality of engaging claws are bent, and the shaft part tip is projected from the gap between the tips of the engaging claws.
  • an object of the present invention is to provide a check valve that can improve the workability of assembly of a negative pressure valve with respect to a positive pressure valve in a valve having a positive pressure valve and a negative pressure valve.
  • a check valve according to the present invention has one end connected to the inside of the fuel tank, the other end connected to the outside of the fuel tank, the inside forming a valve chamber, and a passage connected to the inside of the fuel tank. And a casing formed with a positive pressure valve seat, slidably disposed in the valve chamber, and urged to abut against the positive pressure valve seat by a positive pressure valve spring, and has a through passage penetrating the inside.
  • a positive pressure valve in which a negative pressure valve seat is formed at an opening on the side of the passage to the fuel tank of the through passage, a negative pressure valve assembled to the positive pressure valve so as to open and close the negative pressure valve seat, A retaining member for retaining the negative pressure valve against the positive pressure valve; and a negative pressure valve spring for biasing the negative pressure valve so as to abut against the negative pressure valve seat, wherein the negative pressure valve is the positive pressure valve.
  • a shaft portion that protrudes from the head and is inserted into the positive pressure valve through the opening, and an engagement portion formed on a tip side of the shaft portion, and the retaining member is A base portion formed on the back side of the opening portion of the positive pressure valve and formed with an insertion hole through which the shaft portion of the negative pressure valve is inserted, and formed on the periphery of the insertion hole of the base portion, and engaged with the negative pressure valve.
  • An engaged portion that engages with a portion, a spring support portion that supports one end of the spring for the negative pressure valve, the shaft portion is inserted into the insertion hole, and the engaging portion is engaged with the engaged portion.
  • the negative pressure valve spring has one end supported by the spring support portion of the retaining member, and the other end of the negative pressure valve spring. Is supported on the back side of the opening of the positive pressure valve.
  • the pressing portion of the retaining member is configured such that when the shaft portion of the negative pressure valve is inserted into the insertion hole and the engaging portion is engaged with the engaged portion, It is preferable that the tip of the shaft portion is configured to contact.
  • a guide cylinder that extends around the outer periphery of the shaft portion of the negative pressure valve and is inserted into the spring for the negative pressure valve is extended. Is preferred.
  • the base portion of the retaining member has a cylindrical shape with the insertion hole formed therein, and a pair of the engaged portion is formed on the peripheral wall of the base portion through a slit.
  • the pressing portion has a band shape, and both ends of the pressing portion are connected to a circumferentially opposed portion of the distal end surface of the cylindrical base portion. It is preferable.
  • the positive pressure valve has a cylindrical portion erected on the outer periphery of the negative pressure valve seat, and a distal end surface of the cylindrical portion is in contact with the positive pressure valve seat of the casing. It is preferable that the contact part which separates is comprised.
  • the shaft portion of the negative pressure valve is inserted from the front surface side of the opening portion of the positive pressure valve, the front end side engaging portion is projected from the back side of the opening portion, and the other end of the negative pressure valve spring is opened to the opening of the positive pressure valve.
  • the shaft portion is aligned with the insertion hole of the retaining member, the pressing portion is pushed while holding the retaining member, and the retaining member is pushed into the negative pressure valve, thereby
  • the engaged portion of the retaining member engages with the engaging portion, and one end of the negative pressure valve spring is supported by the spring supporting portion of the retaining member.
  • the negative pressure valve spring is moved against the positive pressure valve.
  • the retaining member can be pushed in by pressing the pressing portion, so that the retaining member can be retained even when the retaining member is small.
  • FIG. 1 It is a disassembled perspective view of the check valve of this invention. It is a principal part expanded sectional view of the check valve. It is a perspective view which shows the positive pressure valve and negative pressure valve which comprise the check valve.
  • the retaining member which comprises the same check valve is shown, (a) is the perspective view, (b) is the perspective view seen from the direction different from (a). It is a top view of the same retaining member. It is sectional drawing of the state which assembled
  • FIG. 4 is an enlarged cross-sectional view of a main part showing a state in which the pressure in the fuel tank becomes a predetermined value or more in the check valve.
  • FIG. 4 is an enlarged cross-sectional view of a main part showing a state in which the pressure in the fuel tank is a negative pressure greater than or equal to a predetermined value compared to the external air pressure in the check valve.
  • the check valve 10 includes a casing body 20 and a subcasing 30, and a casing 15 having a valve chamber V formed therein, and can be slid into the valve chamber V of the casing 15.
  • a positive pressure valve 40 housed in the positive pressure valve 40, a negative pressure valve 50 assembled to the positive pressure valve 40, a positive pressure valve spring S1 that urges the positive pressure valve 40 to abut against the positive pressure valve seat 24 (see FIG. 2), And a negative pressure valve spring S2 that urges the negative pressure valve 50 to abut against the negative pressure valve seat 44 (see FIG. 2).
  • the casing body 20 has a cylindrical tube body 21 with a connecting tube 22 extending integrally at one end and the sub casing 30 assembled at the other end opening.
  • a pipe communicating with the inside of the fuel tank is connected to the outer periphery of the connecting pipe 22, and the inside of the connecting pipe 22 forms a communication path 23 to the fuel tank.
  • an annular flange portion 25 is formed on the outer periphery of the other end opening of the cylindrical body 21, and an annular recess 25 a is provided on the end surface of the flange portion 25 on the subcasing 30 side.
  • the subcasing 30 is assembled to the other end opening of the cylindrical body 21 of the casing body 20, and an opening 32 having a tapered inner peripheral surface is formed at the center thereof and communicates with the outside of the fuel tank.
  • a disc-shaped lid 31 and a connecting pipe 33 extending from the outer periphery of the opening 32 are provided.
  • An external pipe (not shown) connected to a canister or the like disposed outside the fuel tank is connected to the outer periphery of the connection pipe 33.
  • an annular convex portion 34 that engages with the annular concave portion 25a of the casing body 20 protrudes at a position near the outer peripheral edge of the lid body 31, and the inner side thereof is a spring that supports one end of the positive pressure valve spring S1.
  • a support portion 35 is formed.
  • the positive pressure valve 40 disposed in the valve chamber V of the casing 15 has a substantially cylindrical shape having a through passage 41 penetrating therethrough.
  • An opening 43a communicating with the inside of the positive pressure valve is formed at the center of the wall 43 on the tip side of the positive pressure valve 40, and a negative pressure valve seat having an annular protrusion shape from the front side periphery of the opening 43a. 44 protrudes.
  • a cylindrical guide tube 45 is concentrically provided from the rear peripheral edge of the opening 43a of the wall portion 43 with a predetermined gap with respect to the positive pressure valve outer peripheral wall.
  • the guide tube 45 surrounds the outer periphery of the shaft portion 53 (see FIG. 2) of the negative pressure valve 50 and is inserted into the negative pressure valve spring S2.
  • the other end of the negative pressure valve spring S2 is connected to the wall portion 43. It is supported on the back side of the opening 43 a and on the outer peripheral side of the guide tube 45.
  • a plurality of ribs 45a extend in the axial direction on the inner circumference of the guide cylinder 45 in the circumferential direction, whereby the guide cylinder 45 and the negative pressure valve are extended.
  • a clearance with 50 shaft portions 53 is secured, and a flow passage for air or the like is formed (see FIG. 10).
  • an annular cylindrical portion 46 is erected from the outer peripheral edge of the wall portion 43 of the positive pressure valve, and a tip portion thereof forms a contact portion that comes into contact with and separates from the positive pressure valve seat 24 (see FIG. 9 and FIG. 10).
  • an annular spring receiving flange 47 for supporting the other end of the positive pressure valve spring S1 is provided on the outer periphery of the positive pressure valve 40 and near the base end opening.
  • a plurality of guide ribs 48 are extended in the axial direction at a predetermined length on the outer periphery of the positive pressure valve 40 at equal intervals in the circumferential direction.
  • a gap between the casing body 20 and the cylindrical body 21 is secured, and a flow passage for fuel vapor or the like is configured (see FIG. 9).
  • a slit 49 that forms a flow path for fuel vapor or the like is formed between the plurality of guide ribs 48 on the inner peripheral side of the spring receiving flange 47.
  • the fuel vapor or the like passes through the positive pressure valve spring S1 without crossing (see FIG. 9).
  • the positive pressure valve spring S1 has one end supported by the spring support portion 35 of the sub casing 30 and the other end supported by the spring receiving flange 47 of the positive pressure valve 40, and is compressed in the valve chamber V. Accordingly, the positive pressure valve 40 is urged toward the positive pressure valve seat 24 of the casing 15 so that the tip end portion of the cylindrical portion 46 is always in contact with the positive pressure valve seat 24 (see FIG. 2). ).
  • the positive pressure valve 40 When the pressure in the fuel tank rises to a predetermined value or more due to fuel vapor or the like, the positive pressure valve 40 is pressed and slides in the valve chamber V, so that the tip of the cylindrical portion 46 of the positive pressure valve 40 is moved. Moves away from the positive pressure valve seat 24 (see FIG. 9). As a result, as shown by the arrows in FIG. 9, the fuel vapor or the like that has flowed from the communication passage 23 causes the gap between the guide rib 48 of the positive pressure valve 40 and the cylinder 21, or the slit 49 of the positive pressure valve 40 (FIG. 7A). The gas flows into the opening 32 of the sub casing 30 and is discharged out of the fuel tank via the connection pipe 33 and a pipe (not shown).
  • the negative pressure valve 50 assembled to the positive pressure valve 40 having the above-described structure is disposed on the front side of the opening 43 a of the positive pressure valve 40, and a head 51 that contacts and separates from the negative pressure valve seat 44.
  • the head 51 has a shape in which the tip side protrudes and the outer periphery of the head 51 extends in an umbrella shape obliquely outward, and the peripheral edge on the back side is in contact with and away from the negative pressure valve seat 44 of the positive pressure valve 40. (See FIG. 9 and FIG. 10).
  • the shaft portion 53 is provided in a columnar shape with a predetermined length from the center on the back side of the head portion 51, and a portion near the tip thereof is reduced in diameter to form a recessed portion 53a. From the recessed portion 53a, Further, the engaging portion 55 is projected from the tip side. As shown in FIGS.
  • the engaging portion 55 has a tapered shape in which the outer periphery gradually decreases in diameter toward the tip of the shaft portion, and the tip 56 is orthogonal to the axial direction of the shaft portion 53.
  • the front end 56 abuts against the pressing portion 70 of the retaining member 60.
  • This tip 56 is the “tip of the shaft” in the present invention.
  • the negative pressure valve 50 is held against the positive pressure valve 40 by a retaining member 60.
  • the retaining member 60 includes a base 61 disposed on the back side of the opening 43a of the positive pressure valve 40, and a spring support portion 64 that supports one end of the negative pressure valve spring S2.
  • the base portion 61 of this embodiment has a substantially cylindrical shape provided with an insertion hole 63 through which the shaft portion 53 of the negative pressure valve 50 is inserted. From the outer periphery of the tip end in the axial direction, one end of the negative pressure valve spring S2 is formed. A spring support portion 64 having an annular flange shape is provided to project.
  • slits 65 and 65 having a substantially U-shape are formed on the peripheral wall of the base portion 61 in the circumferential direction, and a pair of bendable through the slits 65 and 65 is formed.
  • Elastic locking pieces 67, 67 are provided, respectively.
  • each elastic locking piece 67 in this embodiment has a base end connected to the inner periphery of the tip end in the axial direction of the base portion 61 and extends in parallel along the axial direction of the base portion 61.
  • the distal end portion 67a has a shape that is bent in an approximately L shape toward the radially inner side of the base portion 61, and the distal end portions 67a and 67a are arranged to face each other with a gap therebetween.
  • These front end portions 67a, 67a enter into the recessed portion 53a of the shaft portion 53 of the negative pressure valve 50 and engage with the engaging portion 55 (see FIG. 6).
  • the elastic locking piece 67 constitutes an “engagement portion” in the present invention.
  • a tapered surface 67b is formed on the inner surface of the base end side of each elastic locking piece 67, so that the tip of the shaft portion of the negative pressure valve 50 can be easily inserted between the pair of elastic locking pieces 67, 67. Yes.
  • the inner peripheral surface of each elastic locking piece 67 (portion extending from the proximal end to the distal end portion 67b) has an arc shape suitable for the shaft portion 53 of the negative pressure valve 50 (FIGS. 4A and 5). The inner peripheral surface of the elastic locking piece 67 comes into contact with the shaft portion 53 with almost no gap (see FIGS. 2 and 6).
  • a pair of ribs 71, 71 are directed from the base end side of the base portion 61 toward the tip end side, They extend in parallel with each other along the axial direction, and their tip portions are connected to each other by a pressing portion 70 (see FIGS. 4B and 5).
  • the pressing portion 70 has a belt-like shape, and both ends thereof are connected to portions facing the circumferential direction of the distal end surface of the base portion 61, here, the distal ends of the pair of ribs 71 and 71. ing.
  • the pressing portion 70 includes a plate-like contact portion 70a formed at a position farthest from the distal end surface of the base portion 61, and a base portion from both ends of the corresponding contact portion 70a. It consists of side portions 70b and 70b extending obliquely toward the tip surface of 61, and has a substantially trapezoidal arch shape when viewed from the side. As shown in FIG.
  • the pressing portion 70 is arranged orthogonal to the pair of elastic locking pieces 67 and 67. Further, a tapered surface 71 a is formed on the inner surface on the proximal end side of each rib 71, so that the tip of the shaft portion of the negative pressure valve 50 can be easily inserted between the pair of ribs 71, 71.
  • a plurality of ribs 73 extending in the axial direction are formed on the outer peripheral surface of the peripheral wall of the base 61. Further, a gap 75 is formed on the inner periphery of the base portion 61 between the elastic locking piece 67 and the rib 71 (see FIGS. 4A and 5), whereby the shaft portion 53 is formed. A clearance between the shaft 53 and the base 61 in a state where the retaining member 60 is engaged with the base is secured, and a flow passage for air or the like is configured (see FIG. 10).
  • One end of the negative pressure valve spring S2 is supported by the spring support portion 64 of the retaining member 60, and the other end is the back side of the opening 43a of the wall portion 43 of the positive pressure valve 40. It is supported on the outer peripheral side and is arranged in a compressed state in the positive pressure valve 40, whereby the negative pressure valve 50 is biased toward the positive pressure valve 40, and the back side peripheral portion of the head 51 of the negative pressure valve 50 is positive. It always contacts the negative pressure valve seat 44 of the pressure valve 40 (see FIG. 2).
  • the negative pressure valve 50 When the pressure in the fuel tank drops below a predetermined value below the atmospheric pressure, the negative pressure valve 50 is pressed by the outside air and slides against the positive pressure valve 40 against the biasing force of the negative pressure valve spring S2. The head 51 of the negative pressure valve 50 moves away from the negative pressure valve seat 44 (see FIG. 10). As a result, as shown by the arrow in FIG. 10, the outside air that has flowed into the valve chamber V from the outside of the fuel tank causes the gap 75 between the elastic locking piece 67 of the retaining member 60 and the rib 71 (FIG. 4A and FIG. 5) or through a gap (see FIG. 7A) between the guide cylinder 45 and the shaft portion 53 of the negative pressure valve 50 so as to flow into the fuel tank via the connection pipe 22 or a pipe (not shown). It has become.
  • the base 61 in this embodiment has a cylindrical shape, for example, it may have a plate shape or a thick disk shape.
  • the “engaged portion” that engages with the engagement portion of the negative pressure valve may not be the elastic locking piece 67, but may be, for example, a claw or a convex portion protruding from the inner periphery of the base 61, What is necessary is just to be able to engage with an engaging part.
  • the base end may be connected to the inner periphery of the base portion 61 and may extend in a slanting inward direction.
  • the shape is not particularly limited, and the number of installed pieces may be one. It may be three or more.
  • the pressing portion 70 has a belt-like shape in which both ends are connected to the tip of the base portion 61 and has an arch shape when viewed from the side.
  • the pressing portion 70 has a substantially U-shaped gate shape, It may be in the form of a tongue piece or the like connected to the tip surface of the base 61, and when the engaging part of the negative pressure valve is engaged with the engaged part of the retaining member, the pressing part is the tip of the shaft part. It is sufficient that the structure is located closer to the distal end side in the insertion direction, and it is sufficient that the retaining member can always be pressed from the distal end side in the insertion direction until the engaging portion engages with the engaged portion.
  • the contact portion 70a of the pressing portion 70 is approximately at the center.
  • the present invention is not limited to this, as long as it can cover the tip 56 of the shaft 53 so that it can be pressed, and the engaging portion 55 is an elastic locking piece.
  • the tip 56 of the shaft portion 53 may not contact the pressing portion 70, and a predetermined clearance may be secured.
  • the shaft portion 53 of the negative pressure valve 50 is inserted from the front side opening of the opening portion 43a of the positive pressure valve 40, and the shaft portion 53 is projected from the tip opening through the guide tube 45.
  • the guide cylinder 45 is inserted inside the other end of the negative pressure valve spring S2, and the other end of the negative pressure valve spring S2 is on the back side of the opening 43a of the wall 43 of the positive pressure valve 40.
  • the outer periphery of the tube 45 is brought into contact with and supported.
  • the positive pressure valve 40 While maintaining this state, as shown in FIG. 8, the positive pressure valve 40 is turned over, the tip surface of the cylindrical portion 46 is installed on the work table W, and the positive pressure valve 40 is kept upright. In this state, the shaft portion 53 of the negative pressure valve 50 is aligned with the insertion hole 63 of the retaining member 60, and as shown in FIG. 70 is pushed, and the retaining member 60 is pushed into the negative pressure valve 50.
  • the shaft portion 53 of the negative pressure valve 50 is inserted between the pair of elastic locking pieces 67 and 67 and the pair of ribs 71 and 71 of the retaining member 60 (see FIG. 7B), and each elastic member.
  • the shaft portion 53 is pushed in while being guided by the stopper piece 67 and each rib 71, and the distal end portions 67a and 67a are further pressed by the engaging portion 55 on the distal end side of the shaft portion, so that a pair of elastic locking pieces 67 is obtained. , 67 are expanded.
  • each elastic locking piece 67 is connected to the inner periphery of the base 61 in the axial direction of the base 61 and has a cantilever shape extending in parallel along the axial direction of the base 61.
  • each tip portion 67a enters the recess portion 53a and enters the engagement portion 55.
  • the distal end 56 of the shaft portion 53 is brought into contact with the contact portion 70a of the pressing portion 70, and further pushing of the shaft portion 53 is restricted (see FIG. 6), and one end of the negative pressure valve spring S2 is further applied. Is held in contact with and supported by the spring support portion 64 of the retaining member 60, and the negative pressure valve 50 is retained with the negative pressure valve spring S2 interposed between the positive pressure valve 40 and the positive pressure valve 40, as shown in FIG. Can be assembled.
  • the shaft portion 53 of the negative pressure valve 50 is inserted through the insertion hole 63 into the retaining member 60, and the engaging portion 55 is the elastic locking piece 67 (the engaged portion).
  • the retaining member 60 can be pushed in by pressing the pressing portion 70. Therefore, even when the retaining member 60 is small and difficult to grip, the retaining member 60 can be pushed in efficiently, and the retaining member 60 can be smoothly engaged with the negative pressure valve 50. Assembling workability of the negative pressure valve 50 can be improved.
  • the pressing portion 70 of the retaining member 60 is when the shaft portion 53 of the negative pressure valve 50 is inserted into the insertion hole 63 and the engaging portion 55 is engaged with the elastic locking piece 67.
  • the tip 56 of the shaft portion 53 is configured to come into contact, it is possible to reliably prevent the retaining member 60 from being pushed too much and the operator can grasp that the assembly workability has been completed. The workability can be further increased.
  • the positive pressure valve 40 is provided with the cylindrical portion 46, when the negative pressure valve 50 is assembled to the positive pressure valve 40, the positive pressure valve 40 is turned over so that the front end surface of the cylindrical portion 46. Since the positive pressure valve 40 can be maintained in an upright state (see FIG. 8), the workability of the push-in operation of the retaining member 60 can be improved.
  • the negative pressure valve extends from the front side to the back side of the opening 43a of the positive pressure valve 40.
  • the shaft portion 53 is supported by the guide tube 45, and the inclination of the shaft portion 53 can be suppressed.
  • the stop piece 67 can be easily engaged.
  • the negative pressure valve spring S2 is supported on the outer periphery of the guide cylinder 45, so that the negative pressure valve spring S2 is held in a state in which it is difficult to tilt.
  • the retaining member 60 can be easily pushed.
  • the shaft portion 53 of the negative pressure valve 50 includes not only the guide tube 45 but also the portions other than the ends of the pair of elastic locking pieces 67 and 67 and the pair of ribs 71 and 71 on the outer periphery thereof. Thus, the inclination of the shaft portion 53 can be suppressed.
  • the engaged portion that engages with the engaging portion 55 of the negative pressure valve 50 is a pair of elastic locking pieces formed on the peripheral wall of the cylindrical base portion 61 via the slit 65. 67, 67, the outer diameter of the engaged portion can be prevented from spreading to the outer diameter side of the retaining member 60, and the pressing portion 70 has a band shape, and both ends thereof are the base portions 61. Therefore, the amount of protrusion of the retaining member 60 in the axial direction can be suppressed, and the retaining member 60 can be formed compactly.
  • the check valve 10 is connected to the connecting pipe 22 of the casing body 20 by a pipe disposed in the fuel tank and connected to a cut valve or the like, and is connected to the connecting pipe 33 of the sub casing 30 outside the fuel tank.
  • a pipe connected to a canister or the like is connected, and is disposed inside or outside the fuel tank by a clip or a bracket (not shown).
  • the tip of the cylindrical portion 46 of the positive pressure valve 40 biased by the biasing force of the positive pressure valve spring S1 is positive pressure valve seat. 24, the communication passage 23 to the fuel tank is closed, and the back side peripheral portion of the head 51 of the negative pressure valve 50 urged by the urging force of the negative pressure valve spring S2 is negative of the positive pressure valve 40. In contact with the pressure valve seat 44, the opening 43a is closed.
  • the distal end portion of the cylindrical portion 46 provided in the positive pressure valve 40 forms a contact portion that contacts and separates from the positive pressure valve seat 24 of the casing body 20 of the casing 15.
  • a large contact area between the seat 24 and the tip of the cylindrical portion 46 can be secured, and the sealing performance of the positive pressure valve seat 24 can be improved.
  • the fuel vapor flows into the opening 32 of the sub-casing 30 without traversing the spring S1, and then the fuel vapor is discharged out of the fuel tank via the connecting pipe 33 and a pipe (not shown), and the pressure in the fuel tank is reduced. Can be reduced.
  • the outside air that has flowed into the valve chamber V from the outside of the fuel tank causes a gap 75 between the elastic locking piece 67 of the retaining member 60 and the rib 71 (FIG. 4A and FIG. 5) or through the gap between the guide tube 45 and the shaft portion 53 of the negative pressure valve 50 (see FIG. 7A), and flows into the communication passage 23 without crossing the negative pressure spring S2. Furthermore, the outside air can flow into the fuel tank via the connecting pipe 22 or a pipe (not shown), and the pressure in the fuel tank can be increased.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Transportation (AREA)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
  • Check Valves (AREA)
  • Safety Valves (AREA)

Abstract

L'invention concerne un clapet antiretour, comprenant une soupape à pression positive et une soupape à pression négative, l'aptitude à l'assemblage de la soupape à pression négative avec la soupape à pression positive étant améliorée. Ce clapet antiretour (10) comprend : un carter (15) dans lequel est formé un siège (24) de soupape à pression positive ; une soupape (40) à pression positive dans laquelle est formé un siège (44) de soupape à pression négative ; une soupape (50) à pression négative qui ouvre et ferme le siège (44) de soupape à pression négative ; un élément de retenue (60) qui retient et maintient la soupape (50) à pression négative contre la soupape (40) à pression positive ; et un ressort (S2) de soupape à pression négative qui sollicite la soupape à pression négative (50). La soupape (50) à pression négative comprend une section tête (51), une section tige (53), et une section de mise en prise (55). L'élément de retenue (60) comprend : une section de base (61) dans laquelle est formé un trou d'insertion (63) ; un élément de verrouillage élastique (67) qui vient en prise avec la section de mise en prise (55) ; une section de support (64) de ressort ; et une section de pression (70) qui, lorsque la section de mise en prise (55) est en prise avec l'élément de verrouillage élastique (67), est située davantage vers l'extrémité distale dans le sens d'insertion qu'une extrémité (56) de la section tige (53).
PCT/JP2015/064027 2014-05-21 2015-05-15 Clapet antiretour Ceased WO2015178308A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2016521076A JP6186504B2 (ja) 2014-05-21 2015-05-15 チェックバルブ

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2014-105169 2014-05-21
JP2014105169 2014-05-21

Publications (1)

Publication Number Publication Date
WO2015178308A1 true WO2015178308A1 (fr) 2015-11-26

Family

ID=54553980

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2015/064027 Ceased WO2015178308A1 (fr) 2014-05-21 2015-05-15 Clapet antiretour

Country Status (2)

Country Link
JP (1) JP6186504B2 (fr)
WO (1) WO2015178308A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01157286U (fr) * 1988-04-21 1989-10-30
WO2013031273A1 (fr) * 2011-09-01 2013-03-07 株式会社パイオラックス Clapet de retenue
JP2013057341A (ja) * 2011-09-07 2013-03-28 Piolax Inc チェックバルブ

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01157286U (fr) * 1988-04-21 1989-10-30
WO2013031273A1 (fr) * 2011-09-01 2013-03-07 株式会社パイオラックス Clapet de retenue
JP2013057341A (ja) * 2011-09-07 2013-03-28 Piolax Inc チェックバルブ

Also Published As

Publication number Publication date
JP6186504B2 (ja) 2017-08-23
JPWO2015178308A1 (ja) 2017-04-20

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