WO2011096520A1 - 燃料供給装置 - Google Patents
燃料供給装置 Download PDFInfo
- Publication number
- WO2011096520A1 WO2011096520A1 PCT/JP2011/052385 JP2011052385W WO2011096520A1 WO 2011096520 A1 WO2011096520 A1 WO 2011096520A1 JP 2011052385 W JP2011052385 W JP 2011052385W WO 2011096520 A1 WO2011096520 A1 WO 2011096520A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- fuel
- suction
- engagement
- fuel pump
- engaging
- Prior art date
Links
- 239000000446 fuel Substances 0.000 title claims abstract description 173
- 230000002093 peripheral effect Effects 0.000 claims description 44
- 239000002828 fuel tank Substances 0.000 claims description 22
- 238000002485 combustion reaction Methods 0.000 claims description 5
- 238000005086 pumping Methods 0.000 claims 2
- 210000000078 claw Anatomy 0.000 description 114
- 230000002265 prevention Effects 0.000 description 14
- 230000000630 rising effect Effects 0.000 description 11
- 239000002184 metal Substances 0.000 description 9
- 238000000034 method Methods 0.000 description 7
- 239000011347 resin Substances 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 239000007788 liquid Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000009194 climbing Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 241000135309 Processus Species 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
-
- 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
- F02M37/04—Feeding by means of driven pumps
- F02M37/08—Feeding by means of driven pumps electrically driven
- F02M37/10—Feeding by means of driven pumps electrically driven submerged in fuel, e.g. in reservoir
- F02M37/103—Mounting pumps on fuel tanks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
- B01D35/02—Filters adapted for location in special places, e.g. pipe-lines, pumps, stop-cocks
- B01D35/027—Filters adapted for location in special places, e.g. pipe-lines, pumps, stop-cocks rigidly mounted in or on tanks or reservoirs
- B01D35/0273—Filtering elements with a horizontal or inclined rotation or symmetry axis submerged in tanks or reservoirs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
- B01D35/26—Filters with built-in pumps filters provided with a pump mounted in or on the casing
-
- 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
- F02M37/22—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system
- F02M37/32—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system characterised by filters or filter arrangements
- F02M37/44—Filters structurally associated with pumps
-
- 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
- F02M37/22—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system
- F02M37/32—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system characterised by filters or filter arrangements
- F02M37/50—Filters arranged in or on fuel tanks
Definitions
- the present invention relates to a fuel supply apparatus.
- This application claims priority based on Japanese Patent Application No. 2010-023478 filed in Japan on February 4, 2010, the contents of which are incorporated herein by reference.
- a fuel pump of this type of fuel supply apparatus is provided with a pump portion on the bottom side of the fuel tank that pumps up fuel and pumps it to an internal combustion engine (engine).
- a motor unit for driving the pump unit is provided above the pump unit, and a suction filter (filter) is assembled below the pump unit via a fuel suction port (fuel suction unit). The suction filter prevents the foreign matter in the fuel tank from entering the pump unit by filtering the fuel pumped up by the pump unit.
- a pipe connectable to the fuel suction part is provided, and a protrusion provided near the suction port of the pump part of the fuel suction part is integrally formed on the outer peripheral surface of the pipe.
- a technique for fixing to a flanged portion via a metal bracket is disclosed (see Patent Document 1).
- the metal bracket is provided with an engagement hole into which the protrusion can be inserted.
- a plurality of claws are formed on the periphery of the engagement hole. These claws have a role of preventing protrusions when the protrusions are inserted into the engagement holes.
- the flange portion is formed with a mounting hole at a portion corresponding to the engagement hole.
- the metal bracket is caulked and fixed to the flange portion using a jig in a state where the attachment hole of the flange portion and the engagement hole of the metal bracket are overlapped.
- the assembling workability of the suction filter is improved by fixing the protrusion of the pump part via the metal bracket.
- the present invention has been made in view of the above-described problems, and an object of the present invention is to provide a fuel supply device that can easily assemble and remove a suction filter without increasing the number of parts. To do.
- a fuel supply apparatus includes a fuel pump that is disposed in a fuel tank, pumps up fuel in the fuel tank, and pumps the fuel to an internal combustion engine, and the fuel pump of the fuel tank.
- a fuel pump unit having a holder portion fixed to an inner wall surface; and a suction filter attached to a fuel suction portion provided in the fuel pump unit and configured to filter the fuel sucked into the fuel pump.
- a filter having a connecting portion projecting toward the fuel pump unit and connected coaxially to the fuel suction portion; both the fuel pump unit and the connection portion with respect to the suction portion; When the connection part is rotated around its axis while the connection part is connected, the connection part cooperates with each other to maintain the connection state of the connection part. Means is provided.
- each of the fuel suction portion and the connection portion has a tubular shape, and the connection portion is connected to the fuel suction portion; A first engagement portion provided on the outer peripheral surface of the portion, and a second engagement portion formed on the fuel pump unit and receiving and engaging the first engagement portion from the circumferential direction. Also good.
- the first engagement portion extends in a circumferential direction of the connection portion and is elastically deformable, and further from the second engagement portion. You may provide the permite
- the protrusion is disposed at an intermediate position in the longitudinal direction of the first engagement portion;
- the input portion may be configured to receive an external force when the first engagement portion is elastically deformed.
- At least one of the input portions is radially outward from an outer peripheral surface of the fuel pump unit in a state where the connection portion is connected to the fuel suction portion. It may be protruding.
- the fuel supply device is provided on either the outer peripheral edge of the connection portion on the fuel pump unit side or the fuel pump unit.
- a pair of the first engagement portions are provided at positions that are point-symmetric about the axis of the connection portion, and each of the first engagement portions
- the projections are provided on the radially inner surface side of each of the projections; the front side surface of each projection in the rotation direction is orthogonal to the rotation direction or forms a first inclined surface that is inclined in the rotation direction toward the radially inner side.
- a pair of the second engaging portions are provided in the fuel pump unit; a recess for receiving the first engaging portions is formed on a proximal end side of each of the second engaging portions; A retaining wall for restricting the first engaging portion inserted in the concave portion from coming off in the axial direction is formed on the distal end side of the two engaging portions;
- the side surface on the side that accepts the joint is orthogonal to the rotational direction or outward in the radial direction.
- the follow the rotational direction may form a second inclined surface inclined toward the opposite side.
- connection portion of the suction filter is coaxially connected to the fuel suction portion provided in the fuel pump unit, and the connection portion is rotated around its axis.
- the fuel suction part and the connection part cooperate with each other to maintain the connection state of the connection part. For this reason, when assembling the connection part of the suction filter to the fuel intake port, it is not necessary to separately prepare a member for fixing the suction filter such as a metal bracket, and the number of parts can be reduced. Further, since the suction filter is directly assembled to the fuel intake port, it is possible to easily assemble and remove the suction filter without using a jig. Therefore, the workability of assembling the suction filter into the fuel inlet can be improved.
- the first engaging portion is turned to the second engaging portion by turning the connecting portion around the axis while the connecting portion is connected to the fuel suction portion. Can be easily engaged. Moreover, since the fixing means can have a simple structure, the manufacturing cost of the fuel supply device can be reduced.
- the first engaging portion since the first engaging portion extends in the circumferential direction of the tubular connecting portion, the first engaging portion is engaged with the second engaging portion. Even if it is formed with a length necessary for matching, the first engaging portion does not protrude in the axial direction. For this reason, the length of the connecting portion in the axial direction can be suppressed. In addition, since the first engagement portion is provided with a protrusion that restricts the second engagement portion from coming off, it is possible to reliably prevent the fuel suction portion from falling off the connection portion.
- the portion of the first engagement portion on the tip end side relative to the protrusion receives an external force when the first engagement portion is elastically deformed radially outward. It has an input section.
- the input portion acts as a force point for elastically deforming the first engagement portion, and is positioned at a position farther from the fulcrum than the protrusion that is the action point. For this reason, by applying an external force that is smaller than the case where the external force is applied directly to the input portion using the protrusion as a power point, the first engagement portion can be elastically deformed and the protrusion can be separated from the second engagement portion. Thereby, the engagement state of a 1st engagement part and a 2nd engagement part can be cancelled
- At least one of the input portions protrudes from the outer peripheral surface of the fuel pump unit from the radially outer side in a state where the connection portion is connected to the fuel suction portion. Therefore, it is easy to apply an external force to the input unit. For this reason, the suction filter can be assembled more easily, and the removal workability can be improved.
- the circumferential size of the groove is set so as to allow the rotation of the misassembly prevention convex portion around the axis to a predetermined range. ing. For this reason, when the connection portion is not attached to the fuel suction portion in a predetermined direction, the misassembly prevention convex portion is not fitted into the groove portion. As a result, when the suction filter is assembled, the first engagement portion of the connection portion is not externally fitted until it is located at a position where it can be completely connected to the second engagement portion of the fuel suction portion. Assembly can be prevented.
- the front side surface in the rotation direction of the protrusion may contact the retaining wall of the second engagement portion.
- the force toward the radially outer side does not act on the first engaging portion. That is, the front side surface in the rotation direction of the protrusion of the first engagement portion forms a first inclined surface that is orthogonal to the rotation direction or is inclined in the rotation direction toward the inner side in the radial direction.
- the side surface on the side of receiving the first engaging portion forms a second inclined surface that inclines toward the opposite side to the rotation direction as it goes orthogonal to the rotation direction or radially outward.
- the first engaging portion can be prevented from elastically deforming radially outward. As described above, it is possible to prevent the protrusion of the first engagement portion from climbing on the tip of the second engagement portion, and it is possible to reliably prevent erroneous assembly of the connection portion.
- FIG. 1 It is a perspective view showing a schematic structure of a fuel supply device in a first embodiment of the present invention. It is a perspective view which shows schematic structure of the lower cup in the embodiment. It is a perspective view which shows schematic structure of the suction filter in the embodiment. It is explanatory drawing which shows the state which attached the suction filter to the lower cup in the embodiment. It is explanatory drawing which shows the state which attached the suction filter to the lower cup in the embodiment. It is explanatory drawing which shows the state which attached the suction filter to the lower cup in the embodiment incorrectly. It is a perspective view which shows schematic structure of the connecting pipe in 2nd embodiment of this invention. It is a perspective view which shows schematic structure of the holder part in the embodiment.
- FIG. 1 is a perspective view of the fuel supply device 1. As shown in the figure, the fuel supply device 1 is immersed in a fuel in a fuel tank 2 such as an automobile or a motorcycle, and the fuel is pumped up and pumped to an internal combustion engine (not shown).
- the fuel supply device 1 includes a fuel pump unit 30 and a suction filter 28 disposed on the suction side of the fuel pump unit 30. In the following description, the suction side of the fuel pump unit 30 is the lower side, and the opposite side is the upper side.
- the fuel pump unit 30 includes a fuel pump 3 and a holder portion 4.
- the fuel pump 3 includes a pump part P disposed on the lower side and a motor part M attached on the upper side of the pump part P.
- As the pump part P for example, a non-volume regenerative pump having an impeller is used and driven by the motor part M.
- As the motor part M for example, a DC motor with a brush is used.
- a fuel suction portion (suction pipe) 7 is provided below the pump portion P, and fuel is pumped into the fuel pump 3 from this point.
- a discharge port 8 is provided on the upper side of the motor unit M. The fuel that has passed through the motor part M is pumped from the discharge port 8 to the outside of the fuel pump 3.
- the holder portion 4 includes a flange unit 9 fixed to the upper wall 2 a of the inner wall surface of the fuel tank 2, an upper cup 10 that is provided below the flange unit 9 and covers the outside of the fuel pump 3, and the upper The lower cup 20 is attached to the cup 10 and covers the lower side of the fuel pump 3.
- the flange unit 9 is provided with a substantially disc-shaped unit body 11 made of resin.
- the unit main body 11 is fixed to the upper wall 2a in a state of being inserted from the outside (upper side) of the fuel tank 2 into an opening (not shown) formed in the upper wall 2a of the fuel tank 2. Therefore, the upper surface of the flange unit 9 is exposed to the outside of the fuel tank 2.
- the flange unit 9 is provided with a discharge port 8 of the fuel pump 3 and a fuel take-out pipe 12 communicating with the discharge port 8. That is, the fuel in the fuel tank 2 is pumped from the discharge port 8 to the internal combustion engine through the fuel take-out pipe 12.
- the flange unit 9 is provided with, for example, a check valve and a pressure regulator between the tip of the fuel take-out pipe 12 and the discharge port 8 so that a predetermined fuel pressure can be secured.
- a connector (not shown) is provided on the upper surface of the flange unit 9.
- the connector is fitted with an external connector connected to an external power source.
- This connector is electrically connected to the motor part M of the fuel pump 3 and the sender gauge 23, and the motor part M is thereby driven.
- a recess 13 is formed in the central region of the lower surface of the unit body 11, and the upper cup 10 is formed integrally with the recess 13.
- the upper cup 10 is provided with a cylindrical cup body 14 made of resin or the like.
- the cup body 14 is formed so as to cover the outer peripheral surface of the fuel pump 3, and is formed so that the fuel pump 3 can be inserted from an opening 14 a formed at the lower end of the cup body 14. ing. Further, the outer peripheral surface 14 b of the cup body 14 extends from the flange unit 9 to the substantially axial center of the fuel pump 3.
- the cup body 14 has four engagement pieces 17 extending from the periphery of the opening 14a toward the lower side in the axial direction of the opening 14a at equal intervals in the circumferential direction of the opening 14a.
- the engaging piece 17 is formed so as to be elastically deformable toward the outer side in the axial direction of the cup body 14, and is mechanically held by being caught by the lower cup 20 by this elastic force.
- the engaging piece 17 extends below the motor part M of the fuel pump 3. Further, the engagement hole 19 of the engagement piece 17 is engaged with an engagement projection 18 formed in a lower cup 20 described later.
- FIG. 2 is a perspective view of the lower cup 20.
- the bottomed cylindrical lower cup 20 made of resin or the like is disposed below the fuel pump 3 to support the fuel pump 3.
- the outer diameter of the outer peripheral surface 20a of the lower cup 20 is formed to be slightly smaller than the inner diameter of the outer peripheral surface 14b of the upper cup 10 (cup body 14).
- an engagement convex portion 18 that can be engaged with the engagement hole 19 of the engagement piece 17 is formed.
- the lower cup 20 is held by the upper cup 10 by the engagement projection 18 engaging with the engagement hole 19.
- the fuel pump 3 is supported by the integrated upper cup 10 and lower cup 20.
- an end portion (bottom portion) 20b is provided below the lower cup 20.
- a support plate 21 that extends outward in the radial direction of the lower cup 20 is integrally formed with the end portion 20b.
- a gauge mounting plate 22 is integrally formed at the tip of the support plate 21 so as to follow the axial center direction of the lower cup 20.
- the gauge attachment plate 22 is provided with a sender gauge 23.
- the sender gauge 23 is a liquid level gauge that detects the remaining amount of fuel in the fuel tank 2, that is, a liquid level position.
- the sender gauge 23 is formed in a box shape and is rotatable with respect to the gauge body 24.
- a float 35 provided at the tip of the swing arm 34 and capable of floating on the liquid level of the fuel.
- a deaeration hole 27 is formed at a position closer to the support plate 21 than the center of the end portion 20b so as to penetrate the end portion 20b. Through this deaeration hole 27, the fuel vapor generated in the fuel pump 3 is discharged.
- a cover 27 a that regulates the discharge direction of the fuel vapor discharged from the deaeration hole 27 is integrally formed with the end portion 20 b so as to surround the deaeration hole 27.
- a through hole 26 is formed in the end portion 20b at a position corresponding to the suction pipe 7 of the fuel pump 3 so as to penetrate the end portion 20b.
- the diameter of the through hole 26 is formed such that the suction pipe 7 can be inserted.
- the suction pipe 7 is inserted through the through hole 26 and protrudes downward.
- An O-ring 25 is fitted into the opening end surface 7b at the base of the portion of the suction pipe 7 that protrudes from the through hole 26.
- a pair of second engaging portions 51 to be described later are provided on the end portion 20 b so as to be point-symmetric with respect to the through hole 26.
- FIG. 3 is a perspective view of the suction filter 28.
- the suction filter 28 is provided with a filter medium 36 and a welded portion 37 formed on the outer peripheral edge of the filter medium 36.
- the filter medium 36 is a non-woven fabric formed in a bag shape, and the welded portion 37 is formed by welding the outer peripheral edge of the filter medium 36.
- a connection pipe 38 projects upward from a portion of the suction filter 28 corresponding to the suction pipe 7 of the fuel pump 3.
- the connection pipe 38 is coaxially connected to the suction pipe 7 to allow the filter medium 36 and the suction pipe 7 to communicate with each other, and fixes the suction filter 28 to the lower cup 20.
- the connecting pipe 38 is made of resin, and the lower opening of the connecting pipe 38 is covered with a filter medium 36.
- the fuel in the fuel tank 2 flows into the connection pipe 38 through the filter medium 36.
- the fuel that has flowed into the connection pipe 38 is pumped up by the fuel pump 3.
- the upper opening of the connecting pipe 38 protrudes upward from the welded portion 37.
- a portion protruding from the welded portion 37 is a protruding portion 38 a.
- a misassembly prevention convex portion 46 is formed at one place on the outer peripheral edge 38e on the upper side (tip) of the protruding portion 38a.
- the inner diameter of the upper opening of the connection pipe 38 is set to a size that can be externally fitted to the suction pipe 7.
- the inner peripheral surface of the protrusion 38a is reduced in diameter from a position in the middle toward the lower side.
- a step surface 41a a step provided at the boundary between the reduced diameter region (the reduced diameter portion 41) and the upper side of the reduced diameter portion 41.
- a pair of elastically deformable first engaging portions (engaging claws) 42 are provided on the outer peripheral surface 38b of the protruding portion 38a slightly above the center of the protruding portion 38a in the axial center 38d direction. Is provided so as to be symmetric with respect to the center.
- the engaging claw 42 is formed in a substantially square shape in the longitudinal section and in a substantially L shape in the transverse section. If the portion of the outer peripheral surface 38b where the root portion 42a of the engagement claw 42 is provided is a contact 38c, the portion of the engagement claw 42 on the side of the root portion 42a (the rising portion 43) is a tangent ( (Not shown). Further, the engaging claw 42 is bent from the leading end side of the rising portion 43 and extends along the circumferential direction. A portion of the engaging claw 42 that is ahead of the leading end side of the rising portion 43 is referred to as a claw body portion 44.
- a protrusion 45 that restricts the release from the second engagement portion 51 described later is provided toward the protruding portion 38a and with the claw body portion 44. It protrudes so as to be substantially orthogonal.
- the front side surface in the rotation direction of each protrusion 45 is formed with a first inclined surface 45b that is inclined in the rotation direction as it is orthogonal to the rotation direction or radially inward.
- a third inclined surface 45a that is inclined in the counter-rotating direction as it goes inward in the radial direction is formed on the side surface on the axial center 38d side of the side surfaces of each protrusion 45.
- the portion of the claw main body 44 on the tip side of the projection 45 forms an input unit 61 that receives an external force when the claw main body 44 is elastically deformed.
- a groove 47 into which the upper end of the connection pipe 38 can be fitted is formed in the end portion 20 b so as to surround the through hole 26.
- the end portion 20b is formed with a small groove 48 that is substantially arcuate in plan view and into which the projection 46 for preventing misassembly of the connecting pipe 38 can be fitted.
- the size of the small groove 48 in the circumferential direction is set so that the misassembly preventing convex portion 46 can be rotated by a predetermined range around the axis 7a.
- the small groove 48 communicates with a central portion of the end portion 20 b in the outer peripheral edge of the groove 47, and a step 48 a is formed at the boundary between the groove 47 and the small groove 48.
- a pair of second engaging portions 51 project from the outer peripheral edge of the groove 47 of the end portion 20 b so as to be symmetrical with respect to the through hole 26 at a position corresponding to the engaging claw 42.
- Each second engagement portion 51 is formed so as to be engageable with a pair of engagement claws 42.
- the second engaging portion 51 is formed integrally with the support portion 52 formed so as to protrude downward from the end portion 20 b, and the tip of the support portion 52, and extends toward the radially outer side of the suction pipe 7. It is comprised from the retaining wall 53 which carries out.
- the support portion 52 and the retaining wall 53 constitute a receiving recess 54 that can receive each engagement claw 42 from the circumferential direction on the proximal end side of each second engagement portion 51.
- the connecting pipe 38 is externally fitted to the suction pipe 7 by aligning the position of the projection 46 for preventing misassembly and the position of the small groove 48, and then the connecting pipe 38 is hooked.
- the claw main body 44 is inserted into the receiving recess 54 of each second engaging portion 51 and fixed as shown in FIG. Is done.
- the engaging claws 42 and the second engaging portions 51 are used as fixing means for engaging the lower cup 20 and the suction filter 28.
- the circumferential width W1 of the support portion 52 of the second engagement portion 51 is set to be substantially the same as the distance L1 between the protrusion 45 and the rising portion 43.
- the tip of the claw body portion 44 of at least one engagement claw 42 of the pair of engagement claws 42. (Input part) 61 will be in the state which protruded to the radial direction outer side rather than the outer peripheral surface 20a of the lower cup 20.
- the retaining wall 53 of the second engaging portion 51 restricts the upward movement of the engaging claw 42 when the second engaging portion 51 and the engaging claw 42 are engaged, The engagement claw 42 inserted into the recess 54 is prevented from coming off in the direction of the axis 38d.
- the retaining wall 53 is a flat wall formed in a substantially fan shape in plan view when viewed from above.
- the side surface that receives the engaging claw 42 is orthogonal to the rotational direction of the suction pipe 7, or faces away from the rotational direction as it goes radially outward.
- the second inclined surface 53a is inclined at the inclination angle ⁇ .
- a side surface facing the second inclined surface 53a is defined as a side surface 53b.
- the radially outer end of the suction pipe 7 is a corner 55, and the radially inner end is an end 53e.
- the inclination angle ⁇ of the second inclined surface 53a is an angle formed by the intersection of the straight line connecting the axial center 7a and the end 53e of the suction pipe 7 and the second inclined surface 53a.
- the inclination angle ⁇ is along the first inclined surface 45b (see FIG. 4) of the protrusion 45. Is set.
- An outer peripheral side surface 53d extends from the corner portion 55 to the side surface 53b.
- the side surface 53 b is orthogonal to the rotation direction of the suction pipe 7, and the outer peripheral side surface 53 d is bent so as to bulge toward the radially outer side of the suction pipe 7.
- a round chamfered portion 56 may be formed instead of the corner portion 55 in the region of the boundary between the side surface 53b and the outer peripheral side surface 53d.
- the above-described opening 57 is formed in the end portion 20b at a position corresponding to the projected portion of the retaining wall 53.
- FIG. 2 is a diagram illustrating a schematic configuration of the lower cup 20
- FIG. 3 is a diagram illustrating a schematic configuration of the suction filter 28.
- 4 to 6 show a state where the connection pipe 38 of the suction filter 28 is attached to the lower cup 20
- FIGS. 4 and 5 are explanatory views showing a state where the connection pipe 38 is normally assembled. These are explanatory drawings which show the state which connected the connecting pipe 38 incorrectly.
- the fuel pump 3 is inserted into the cup body 14 (upper cup 10).
- the lower cup 20 is inserted into the cup body 14 (upper cup 10).
- the engagement convex portion 18 of the lower cup 20 and the engagement piece 17 of the upper cup 10 are engaged, and the lower cup 20 is held by the cup body 14. Is done.
- the connecting pipe 38 is fitted onto the suction pipe 7 in a state where the axial center 38 d of the connecting pipe 38 of the suction filter 28 is aligned with the axial center 7 a of the suction pipe 7.
- the position of each engaging claw 42 of the connection pipe 38 is adjusted so that it will not interfere with each second engaging part 51 protruding from the lower cup 20.
- the convex portion 46 for preventing misassembly of the connecting pipe 38 is adjusted so as to correspond to the groove portion (small groove) 48 of the lower cup 20. As shown in FIG.
- the size of the small groove 48 in the circumferential direction is set so as to allow the rotation of the misassembly prevention convex portion 46 about the axis 7 a only within a predetermined range.
- FIG. 4 shows the counterclockwise rotation direction as an arrow CCW.
- the third inclined surface 45 a of the protrusion 45 comes into contact with the support portion 52 of the second engagement portion 51. If the connection pipe 38 is further rotated around the axis 7a from here, a radial force acts radially outward on the third inclined surface 45a. As a result, the engaging claw 42 is pushed and expanded outward in the radial direction, and the protrusion 45 rides on the radially outer side surface of the support portion 52.
- connection pipe 38 When the connection pipe 38 is further rotated around the axis 7 a, the radially inner side surface of the engagement claw 42 gets over the radially outer side surface of the support portion 52. At that time, a restoring force directed radially inward acts on the engaging claw 42, and both circumferential ends of the support portion 52 are formed by the protrusion 45 of the engaging claw 42 and the radially inner side surface of the rising portion 43. Is clamped (see FIG. 5). At this time, the protrusion 45 restricts the engagement claw 42 from moving away from the second engagement portion 51. As a result, the rotation of the connecting pipe 38 around the axis 7a is restricted.
- connection pipe 38 is fitted and fixed to the suction pipe 7, and the attachment of the suction filter 28 to the lower cup 20 is completed.
- each engagement claw 42 by applying an external force to both the input portions 61 of each engagement claw 42, the protrusion 45 of each engagement claw 42 is separated from the support portion 52 of each second engagement portion 51, and each second engagement.
- the engaged state between the portion 51 and the engaging claw 42 is released.
- the connection pipe 38 is rotated clockwise around the axis 7 a of the suction pipe 7.
- FIG. 4 shows the clockwise direction of rotation as arrow CW.
- the engaging claw 42 is pulled out from the receiving recess 54 of the second engaging portion 51.
- the connecting pipe 38 is removed from the suction pipe 7.
- the connecting pipe 38 is misassembled into the suction pipe 7 in a state where the position of the mis-assembly preventing convex portion 46 of the connecting pipe 38 is shifted from the position of the small groove 48 of the lower cup 20.
- the case where it has closed will be described.
- the connecting pipe 38 is not inserted into the suction pipe 7 to a predetermined depth, and a gap is formed between the end portion 20b and the outer peripheral edge 38e that is the tip of the connecting pipe 38.
- connection pipe 38 when the connection pipe 38 is rotated around the axis 7a in the arrow CCW direction in a state where there is a gap between the end portion 20b and the outer peripheral edge 38e which is the tip of the connection pipe 38, the first of the protrusion 45
- the inclined surface 45 b comes into contact with the second inclined surface 53 a of the retaining wall 53.
- the protrusion 45 of the engaging claw 42 is provided so as to be substantially orthogonal to the claw body 44, and the first inclined surface 45 b is orthogonal to the rotational direction or directed radially inward. According to the direction of rotation.
- the second inclined surface 53a of the retaining wall 53 is inclined at an inclination angle ⁇ toward the opposite side of the rotation direction as it goes orthogonally to the rotation direction of the suction pipe 7 or toward the radially outer side.
- the inclination angle ⁇ is set to be along the first inclined surface 45b of the protrusion 45 when the second inclined surface 53a and the protrusion 45 of the engaging claw 42 are present at a position where they overlap in the direction of the axis 7a. Yes.
- the round chamfered portion 56 is formed instead of the corner portion 55 in the region of the boundary between the second inclined surface 53a and the outer peripheral side surface 53c, the round chamfered portion is formed when the suction filter 28 is erroneously assembled. 56 and the projection 45 of the engaging claw 42 may come into contact with each other, and a force directed radially outward may be applied to the engaging claw 42. For this reason, there is a possibility that the projection 45 rides on the retaining wall 53. That is, the corner portion 55 formed on the second inclined surface 53a of the retaining wall 53 reliably prevents the suction filter 28 from being erroneously assembled, and fails-safe for preventing the suction filter 28 from falling off the lower cup 20. Function as.
- connection part (connection pipe) 38 of the suction filter 28 is coaxially connected to the fuel suction part (suction pipe) 7 provided in the fuel pump unit 30.
- the connecting pipe 38 When the connecting pipe 38 is rotated around the axis 7a, the suction pipe 7 and the connecting pipe 38 cooperate with each other to maintain the connected state.
- a member for fixing the suction filter 28, such as a metal bracket, and the number of parts can be reduced.
- the suction filter 28 is directly assembled to the suction pipe 7, it is possible to easily assemble and remove the suction filter 28 without using a jig. Therefore, the workability of assembling the connection pipe 38 to the suction pipe 7 can be improved.
- the suction filter 28 and the connection pipe 38 can be exchanged at the same time. For this reason, for example, compared with the case where the engaging claw 42 is provided in the lower cup 20, it becomes possible to perform the exchange operation
- the engaging claw 42 is bent from the leading end side of the rising portion 43 extending toward the tangential line (not shown) at the contact 38c and the claw body portion 44 of the rising portion 43 and extends along the circumferential direction. It is comprised from the nail
- the engagement claw 42 is formed with a length necessary for engaging with the second engagement portion 51, the engagement claw 42 does not protrude in the direction of the axis 38d. For this reason, the length of the connecting pipe 38 (projecting portion 38a) in the axial center 38d direction can be suppressed, and the fuel supply device 1 can be downsized. Further, since the fixing means including the engaging claw 42 and the second engaging portion 51 can have a simple structure, the manufacturing cost of the fuel supply device 1 can be reduced.
- the engagement claw 42 is provided with the protrusion 45 that restricts the second engagement portion from coming off, so that the engagement state between the engagement claw 42 and the second engagement portion 51 is reliably maintained. can do. For this reason, it is possible to reliably prevent the suction pipe 7 from dropping from the connection pipe 38. That is, the suction filter 28 can be prevented from falling off the lower cup 20.
- the portion of the engaging claw 42 on the tip side of the protrusion 45 forms an input portion 61 that receives an external force when the engaging claw 42 is elastically deformed radially outward.
- the input part 61 acts as a power point for elastically deforming the engaging claw 42, and is located at a position farther from the fulcrum (the root portion 42a) than the protrusion 45 which is an action point.
- the engagement claw 42 is elastically deformed and the projection 45 is separated from the second engagement portion 51. Can do.
- claw 42 and the 2nd engagement part 51 can be cancelled
- the input portion 61 of at least one of the engagement claws 42 is the outer peripheral surface of the fuel pump unit 30 (the outer periphery of the lower cup 20). Since it protrudes from the outer side in the radial direction than the surface 20 a), when an external force is applied to each input portion 61, the external force can be easily applied to the protruding portion of the input portion 61. For this reason, the suction filter 28 can be easily assembled, and the removal workability of the suction filter 28 can be improved.
- a misassembly prevention convex portion 46 is formed on the outer peripheral edge 38e which is the tip of the connecting pipe 38 (projection portion 38a), and the misassembly prevention convex portion 46 can be fitted into the end portion 20b of the lower cup 20.
- a small groove 48 is formed.
- the front side surface in the rotation direction of the protrusion 45 of the engaging claw 42 forms a first inclined surface 45b that is orthogonal to the rotation direction or is inclined in the rotation direction toward the inner side in the radial direction.
- the side surface of the wall that receives the engaging claws 42 forms a second inclined surface 53a that is inclined perpendicularly to the rotation direction or radially outward from the rotation direction. For this reason, even if the first inclined surface 45b and the second inclined surface 53a come into contact with each other and a radial force acts on the second inclined surface 53a from the first inclined surface 45b, this force is In 53a, it acts radially or radially inward. As a result, the engagement claw 42 is prevented from being elastically deformed radially outward.
- FIG. 7 is a perspective view of the connecting pipe 138 in the present embodiment
- FIG. 8 is a perspective view of the lower cup 120 in the present embodiment.
- symbol is attached
- the fuel supply device 1 includes a fuel pump 3, a holder portion 4 that is fixed to the upper wall 2 a of the fuel tank 2 and supports the fuel pump 3, and a suction filter 28 that is disposed below the fuel pump 3.
- a support plate 121 protruding outward in the radial direction is integrally formed at a point formed by a bottomed cylindrical lower cup 120 attached to the cup 10 and a region on the end portion 120b side of the outer peripheral surface 120a of the lower cup 120.
- the small groove 48 into which the misassembly preventing convex portion 46 can be fitted is formed in the end portion 120b of the lower cup 120, which is the same as in the first embodiment described above.
- a pair of elastically deformable engaging claws 142 are point-symmetric about the axis 138d of the projecting portion 138a in the connecting pipe 138 (projecting portion 138a) of the suction filter 28 in this embodiment. It is provided at such a position. Further, the engaging claw 142 is formed in a substantially L-shaped cross section. That is, when the portion of the outer peripheral surface 138b of the connecting pipe 138 where the root portion 142a of the engaging claw 142 is provided is a contact 138c, the portion of the engaging claw 142 on the root portion 142a side (the rising portion 143) is , Extending in the direction of a tangent (not shown) at the contact 138c.
- the engaging claw 142 is bent from the tip side of the rising portion 143 and extends along the circumferential direction.
- a portion of the engaging claw 142 that is ahead of the leading end side of the rising portion 143 is referred to as a claw main body portion 144.
- An opening 146 is formed in the central area of the nail main body 144 in plan view.
- a pair of second engaging portions 151 project from the end portion 120 b of the lower cup 120 at locations corresponding to the pair of engaging claws 142.
- the second engagement portion 151 includes a support wall 152 having an arcuate cross section that can be interposed between the connection pipe 138 and the claw body portion 144, and an engagement convex portion 153.
- the engagement convex portion 153 protrudes from a portion corresponding to the opening 146 on the radially outer surface of the support wall 152.
- the engaging convex portion 153 is formed so as to be able to fit into the opening 146 of the claw main body portion 144.
- the connection pipe 138 is connected to the suction pipe 7 with the axial center 138 d of the upper opening of the connection pipe 138 of the suction filter 128 aligned with the axial center 7 a of the suction pipe 7. Fit externally. At this time, the position of each engaging claw 142 of the connecting pipe 138 is adjusted so as to be a position that does not interfere with each second engaging portion 151 protruding from the lower cup 120. Further, the position of the misassembly prevention convex portion 46 of the connecting pipe 138 is adjusted so as to be a position corresponding to the groove portion (small groove 48) of the lower cup 120.
- connection pipe 138 is fitted and fixed to the suction pipe 7, and the attachment of the suction filter 28 to the lower cup 120 is completed.
- the engagement claw 142 can be formed larger than the engagement claw 42 of the first embodiment described above. .
- the rigidity of the engaging claw 142 can be increased.
- the contact area between the engaging claw 142 and the second engaging portion 151 can be increased as compared with the first embodiment, the holding force of the connection pipe 138 by the engaging claw 142 can be increased.
- the structure of the engaging claw 142 and the second engaging portion 151 can be simplified, the manufacturing cost of the fuel supply device 1 can be reduced.
- the present invention is not limited to the configuration of each of the above-described embodiments, and includes various modifications made to the above-described embodiments without departing from the spirit of the present invention.
- the connection pipe 38 (138) of the suction filter 28 is externally fitted and fixed to the suction pipe 7 protruding from the end portion 20b (120b) of the lower cup 20 (120) has been described.
- the fixing method of the suction pipe 7 and the connection pipe 38 (138) is not limited to this, and each configuration is changed so that the connection pipe 38 (138) is fitted and fixed to the suction pipe 7. It doesn't matter.
- connection pipe 38 (138) When the connection pipe 38 (138) is fitted and fixed to the suction pipe 7, the engaging claw 42 (142) protruding from the connection pipe 38 (138) and the second protrusion protruding from the lower cup 20 (120) are provided.
- the fixing means instead of the engaging part 51 (151).
- a long groove in the circumferential direction may be formed on the outer peripheral surface of the suction pipe 7, and a protrusion that can be fitted in the groove of the suction pipe 7 may be formed on the connection pipes 38 and 138.
- Such a fixing means is not limited to the above-mentioned means.
- connection pipe 38 (138) When the connection pipe 38 (138) is externally fitted to the suction pipe 7 and then the connection pipe 38 (138) is rotated about the axis, the connection to the suction pipe 7 is established. There is no limitation as long as it engages with the tube 38 (138).
- the misassembly prevention convex portion 46 is provided at the tip of the connecting pipe 38 (138), and the misassembly prevention convex portion is provided on the end portion 20b (120b) of the lower cup 20 (120).
- the case where the small groove 48 into which 46 can be inserted has been described.
- the configuration in which the suction pipe 7 and the connection pipe 38 (138) are engaged is not limited to this, and the misassembly prevention convex part 46 is formed in the end part 20b (120b) of the lower cup 20 (120).
- channel in which the misassembly prevention convex part 46 can be inserted may be formed in the front-end
- the radial thickness of the connection pipe 38 (138) may be set to a thickness capable of forming a groove.
- the pair of engaging claws 42 (142) protrudes from the connecting pipe 38 (138), and the pair of second engaging portions 51 (151) protrudes from the lower cup 20 (120).
- the number of the engaging claws 42 (142) and the second engaging portions 51 (151) is not limited to this, and at least one engaging claw 42 (142) protrudes from the connecting pipe 38 (138). It is sufficient that at least one second engaging portion 51 (151) is provided on the lower cup 20 (120).
- Fuel supply apparatus 2 Fuel tank 2a Upper wall 3 Fuel pump 4 Holder part 7 Suction pipe 7 (fuel suction part) 7a Shaft center 20,120 Lower cup 20a, 120a Outer peripheral surface 20b, 120b End part 28 Suction filter 30
- Fuel pump unit 38 138 Connection pipe (connection part) 38b, 138b outer peripheral surface 38c outer peripheral edge 38d shaft center 42, 142 engaging claw (first engaging portion) 43,143 Standing portion 44,144 Claw body portion 45,145 Protrusion 45b First inclined surface 46 Convex portion (protruding portion for preventing misassembly) 47 Groove 48 Small groove (groove) 51,151 Second engaging portion 52 Support portion 53 Retaining wall 53a Second inclined surface 54 Receiving recess 61,161 Input portion
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- Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
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Abstract
Description
本願は、2010年2月4日に、日本に出願された特願2010-023478号に基づき優先権を主張し、その内容をここに援用する。
サクションフィルタは、ポンプ部によって汲み上げられる燃料を濾過することによって、燃料タンク内の異物がポンプ部に浸入することを阻止する。
この金属ブラケットには、前記突起を挿入可能な係合孔が設けられている。この係合孔の周縁には、複数の爪が形成されている。これらの爪は、係合孔に突起が挿入された際の、突起の抜け止めとしての役割を有する。また、フランジ部には、前記係合孔に対応する部位に取付け孔が形成されている。そして、フランジ部の取付け孔と金属ブラケットの係合孔とを重ねた状態で、フランジ部に、治具を用いて金属ブラケットをカシメ固定している。
このように、ポンプ部の突起を、金属ブラケットを介して固定することで、サクションフィルタの組み付け作業性を向上させようとしている。
また、金属ブラケットを、治具を用いてサクションフィルタのフランジ部にカシメ固定するため、サクションフィルタの組み付けと、取り外し作業とが煩雑となる。このため、燃料吸入部へのサクションフィルタの組み付け作業性を向上しにくいという課題があった。
〔1〕本発明の一態様に係る燃料供給装置は、燃料タンク内に配置されて同燃料タンク内の燃料を汲み上げて内燃機関へと圧送する燃料ポンプ、および、この燃料ポンプを前記燃料タンクの内壁面に固定するホルダ部を有する燃料ポンプユニットと;この燃料ポンプユニットに設けられた燃料吸入部に取り付けられ、前記燃料ポンプに吸入される前記燃料を濾過するサクションフィルタと;を備え、前記サクションフィルタが、前記燃料ポンプユニットに向かって突出するとともに前記燃料吸入部に対して同軸に接続される接続部を有し;前記燃料ポンプユニットおよび前記接続部の双方に、前記吸入部に対して前記接続部を接続させた状態で前記接続部をその軸心回りに回転させた場合に互いに協働して前記接続部の接続状態を維持する固定手段が設けられている。
また、第一係合部に、前記第二係合部からの抜けを規制する突起が備えられていることにより、前記燃料吸入部が接続部から脱落することを確実に防止できる。
すなわち、第一係合部の突起の回転方向前側側面は、回転方向に対して直交、または径方向内側に向かうに従い回転方向に向かって傾斜する第一傾斜面をなしている一方、抜け止め壁の第一係合部を受け入れる側の側面は、回転方向に対して直交、または径方向外側に向かうに従い前記回転方向とは反対側に向かって傾斜する第二傾斜面をなしている。このため、第一傾斜面と第二傾斜面とが当接して第一傾斜面から第二傾斜面に対して径方向の力が働いても、この力は、第二傾斜面において径方向あるいは径方向内側へ作用する。この結果、第一係合部が径方向外側に弾性変形することが防げる。
以上により、第一係合部の突起が第二係合部の先端に乗り上げることを防止でき、接続部の誤組み付けを確実に防止することが可能になる。
以下、図面を参照して、本発明に係る燃料供給装置の第一実施形態について説明する。なお、以下の図面において、各部材を認識可能な大きさとするために、各部材の縮尺を適宜変更している。
同図に示すように、燃料供給装置1は、例えば、自動車や自動二輪車などの燃料タンク2内の燃料に浸漬され、この燃料を汲み上げて不図示の内燃機関に圧送する。
燃料供給装置1は、燃料ポンプユニット30と、この燃料ポンプユニット30の吸入側に配設されたサクションフィルタ28とを備えている。なお、以下の説明においては、燃料ポンプユニット30の吸入側を下側、その反対側を上側とする。
ポンプ部Pの下側には燃料吸入部(吸入管)7が設けられており、これから燃料が燃料ポンプ3内に汲み上げられる。また、モータ部Mの上側には吐出口8が設けられている。モータ部M内を通った燃料は、この吐出口8から燃料ポンプ3の外側へと圧送される。
また、フランジユニット9には、燃料ポンプ3の吐出口8と、この吐出口8に連通する燃料取り出し管12とが設けられている。すなわち、燃料タンク2内の燃料は、吐出口8から燃料取り出し管12を介して内燃機関へと圧送される。
なお、フランジユニット9には、燃料取り出し管12の先端と吐出口8との間に、例えば、チェックバルブやプレッシャレギュレータが設けられており、所定の燃圧を確保できるようになっている。
また、ユニット本体11の下側の面の中央の領域には凹部13が形成されており、この凹部13に一体的にアッパーカップ10が形成されている。
係合片17は、燃料ポンプ3のモータ部Mよりも下側に延出している。また、係合片17の係合孔19は、後述のロワーカップ20に形成されている係合凸部18に係合される。
図1、図2に示すように、樹脂などで形成された有底筒状のロワーカップ20は、燃料ポンプ3の下側に配設されて、燃料ポンプ3を支持している。このロワーカップ20の外周面20aの外径は、アッパーカップ10(カップ本体14)の外周面14bの内径よりもやや小さく形成されている。
ロワーカップ20の外周面20aには、係合片17の係合孔19に係合可能な係合凸部18が形成されている。この係合孔19に係合凸部18が係合することによって、ロワーカップ20はアッパーカップ10に保持される。そして、一体化されたアッパーカップ10とロワーカップ20とによって、燃料ポンプ3が支持される。
また、エンド部20bには、後述する一対の第二係合部51が、貫通孔26を中心として点対称となるような位置に突設されている。
図1、図3に示すように、サクションフィルタ28は、濾材36と、濾材36の外周縁に形成された溶着部37とが設けられている。濾材36は、袋状に形成された不織布であって、溶着部37は、濾材36の外周縁を溶着することで形成されている。
接続管38は樹脂で形成されたものであって、この接続管38の下側の開口は、濾材36により覆われている。これにより、燃料タンク2内の燃料が濾材36を介して接続管38内に流れ込む。この接続管38内に流れ込んだ燃料は、燃料ポンプ3に汲み上げられる。
さらに、接続管38の上側の開口は、溶着部37から上側に向けて突出している。この接続管38のうち、溶着部37から突出した部分が突出部38aとなっている。そして、突出部38aの上側(先端)の外周縁38eには、誤組み防止用凸部46が一箇所成形されている。
各突起45の回転方向前側面は、回転方向に対して直交、または径方向内側に向かうに従い回転方向に向かって傾斜する第一傾斜面45bが形成されている。また、各突起45の側面のうち、軸心38d側の側面には、径方向内側に向かうに従い、反回転方向に向かって傾斜する第三傾斜面45aが構成されている。
また、爪本体部44の前記突起45よりも先端側の部分は、爪本体部44を弾性変形させる際の外力を受け入れる入力部61をなしている。
これら係合爪42と第二係合部51とは、ロワーカップ20とサクションフィルタ28とを係合するための固定手段として用いられる。
さらに、第二係合部51の抜け止め壁53は、第二係合部51と係合爪42とが係合した際、この係合爪42の上側への移動を規制することで、前記凹部54に挿入された各係合爪42の軸心38d方向への抜けを規制する。
抜け止め壁53は、上側から見て平面視略扇状に形成された平板状の壁である。
この傾斜角度θは、第二傾斜面53aと係合爪42の突起45とが軸心7a方向で重なる位置に存在するとき、突起45の第一傾斜面45b(図4参照)に沿うように設定されている。
一方、側面53bと外周側面53dとの境目の領域には、角部55に代わって丸面取り部56が形成されていてもよい。また、エンド部20bには、抜け止め壁53の投影部分に対応する位置に、先述した開口部57が形成されている。
図2はロワーカップ20の概略構成を示す図であり、図3はサクションフィルタ28の概略構成を示す図である。図4~図6は、ロワーカップ20に、サクションフィルタ28の接続管38を取り付けた状態を示し、図4、図5は、接続管38を正常に組み付けた状態を示す説明図であり、図6は、接続管38を誤組み付けした状態を示す説明図である。
その前に、接続管38の各係合爪42の位置を、ロワーカップ20に突設されている各第二係合部51に干渉しない位置となるように調整する。また、接続管38の誤組み防止用凸部46を、ロワーカップ20の溝部(小溝)48に対応する位置となるように調整する。図2に示すように、この小溝48の周方向の大きさは、前記誤組み防止用凸部46の軸心7a回りでの回動を所定範囲だけ許容するように設定されている。
この状態で接続管38を吸入管7に差し込むと、接続管38の誤組み防止用凸部46は小溝48に嵌入するとともに、誤組み防止用凸部46は、溝47と小溝48との境目の段差48aに当接する。そして、図3に示す段差面41aと、吸入管7の開口端面7bとの間で、Oリング25は軸心38d方向に向かって圧縮される。これによって、接続管38の内周面と吸入管7の外周面との間は、Oリング25によってシールされる。
その際に、係合爪42に、径方向内側に向けた復元力が作用し、この係合爪42の突起45と立ち上がり部43の径方向内側の側面とにより、支持部52の周方向両端が挟持される(図5参照)。
このとき、突起45により、係合爪42が第二係合部51から抜け方向へ移動することが規制される。この結果、接続管38の軸心7a回りへの回転が規制される。さらに、係合爪42の軸心7a方向への移動が第二係合部51の抜け止め壁53によって規制される。以上により、図5に示すように、吸入管7に接続管38が外嵌固定され、サクションフィルタ28のロワーカップ20への取り付けが完了する。
このように、各係合爪42の入力部61双方に外力を加えることで各係合爪42の突起45が各第二係合部51の支持部52からそれぞれ離反し、各第二係合部51と係合爪42との係合状態が解除される。
次いで、第二係合部51と係合爪42との係合状態が解除された状態で、接続管38を、吸入管7の軸心7aを中心とした時計回りに回転させる。図4に、時計回りの回転方向を矢印CWとして示す。すると、係合爪42が第二係合部51の受け入れ凹部54から引き抜かれる。これにより、吸入管7から接続管38が取り外される。
同図に示すように、この状態で吸入管7に接続管38を外嵌めさせようとすると、誤組み防止用凸部46がロワーカップ20のエンド部20bに当接する。このため、接続管38が吸入管7に所定の深さまで差し込まれず、エンド部20bと接続管38の先端である外周縁38eとの間に間隙が生じる。
ここで、係合爪42の突起45は、爪本体部44に対して略直交するように突設されるとともに、第一傾斜面45bは、回転方向に対して直交、または径方向内側に向かうに従い回転方向に向かって傾斜している。
一方、抜け止め壁53の第二傾斜面53aは、吸入管7の回転方向に対して直交、または径方向外側に向かうに従い前記回転方向とは反対側に向かって傾斜角度θで傾斜している。また、この傾斜角度θは、第二傾斜面53aと係合爪42の突起45とが軸心7a方向で重なる位置に存在するとき、突起45の第一傾斜面45bに沿うように設定されている。
すなわち、抜け止め壁53の第二傾斜面53aに形成されている角部55は、サクションフィルタ28の誤組み付けを確実に防止し、サクションフィルタ28のロワーカップ20からの脱落を防止するためのフェールセーフとして機能する。
以上により、係合爪42の突起45が第二係合部51の先端に乗り上げることを防止でき、吸入管7と接続管38との誤組み付けを確実に防止することが可能となる。
次に、本発明の第二実施形態を図7、図8に基づいて説明する。
図7は、本実施形態における接続管138の斜視図、図8は、本実施形態におけるロワーカップ120の斜視図である。なお、上記第一実施形態と同一の態様については、同一符号を付して説明する。
すなわち、接続管138の外周面138bのうち、係合爪142の根元部分142aが設けられた箇所を接点138cとすると、係合爪142のうち、根元部分142a側の部分(立ち上がり部143)は、接点138cにおける接線(不図示)の方向に向かって延在している。また、係合爪142は、立ち上がり部143の先端側から屈曲するとともに、周方向に沿って延在している。この係合爪142のうち、立ち上がり部143の先端側より先の部分を爪本体部144とする。また、爪本体部144の平面視中央領域には、開口部146が形成されている。
ここで、燃料供給装置1の組み立て手順は、前述の第一実施形態と同様である。まず、ロワーカップ120にサクションフィルタ128を取り付けるにあたって、サクションフィルタ128の接続管138の上側の開口の軸心138dを、吸入管7の軸心7aに合わせた状態で、吸入管7に接続管138を外嵌めさせる。
このとき、接続管138の各係合爪142の位置を、ロワーカップ120に突設されている各第二係合部151に干渉しない位置となるように調整する。また、接続管138の誤組み防止用凸部46の位置を、ロワーカップ120の溝部(小溝48)に対応する位置となるように調整する。
さらに接続管138を軸心7a回りに回転させると、係合凸部153の位置と開口部146の位置とが一致したところで、係合爪142に径方向内側に向けた復元力が作用し、開口部146に係合凸部153が係合する。これにより、第二係合部151に係合爪142が保持される。以上により、吸入管7に接続管138が外嵌固定され、サクションフィルタ28のロワーカップ120への取り付けが完了する。
例えば、上述の実施形態では、ロワーカップ20(120)のエンド部20b(120b)から突出する吸入管7にサクションフィルタ28の接続管38(138)を外嵌固定した場合について説明した。しかしながら、吸入管7と接続管38(138)との固定方法は、これのみに限られるものではなく、吸入管7に接続管38(138)を内嵌固定させるように、各構成を変更してもかまわない。
2 燃料タンク
2a 上壁
3 燃料ポンプ
4 ホルダ部
7 吸入管7(燃料吸入部)
7a 軸心
20,120 ロワーカップ
20a,120a 外周面
20b,120b エンド部
28 サクションフィルタ
30 燃料ポンプユニット
38,138 接続管(接続部)
38b、138b 外周面
38c 外周縁
38d 軸心
42,142 係合爪(第一係合部)
43,143 立ち上がり部
44,144 爪本体部
45,145 突起
45b 第一傾斜面
46 凸部(誤組み防止用凸部)
47 溝
48 小溝(溝部)
51,151 第二係合部
52 支持部
53 抜け止め壁
53a 第二傾斜面
54 受け入れ凹部
61,161 入力部
Claims (7)
- 燃料タンク内に配置されて同燃料タンク内の燃料を汲み上げて内燃機関へと圧送する燃料ポンプ、および、この燃料ポンプを前記燃料タンクの内壁面に固定するホルダ部を有する燃料ポンプユニットと;
この燃料ポンプユニットに設けられた燃料吸入部に取り付けられ、前記燃料ポンプに吸入される前記燃料を濾過するサクションフィルタと;
を備え、
前記サクションフィルタが、前記燃料ポンプユニットに向かって突出するとともに前記燃料吸入部に対して同軸に接続される接続部を有し;
前記燃料ポンプユニットおよび前記接続部の双方に、前記吸入部に対して前記接続部を接続させた状態で前記接続部をその軸心回りに回転させた場合に互いに協働して前記接続部の接続状態を維持する固定手段が設けられている;
ことを特徴とする燃料供給装置。 - 前記燃料吸入部および前記接続部のそれぞれが管状をなすとともに、前記燃料吸入部に前記接続部が接続され;
前記固定手段が、
前記接続部の外周面に設けられた第一係合部と、
前記燃料ポンプユニットに形成されてかつ、前記第一係合部を周方向から受け入れて係合する第二係合部と、
を備える;
ことを特徴とする請求項1に記載の燃料供給装置。 - 前記第一係合部が、前記接続部の周方向に延在するとともに弾性変形可能であり、さらには前記第二係合部からの抜けを規制する突起を備えていることを特徴とする請求項2に記載の燃料供給装置。
- 前記第一係合部の長手方向の途中位置に前記突起が配置され;
前記第一係合部の前記突起よりも先端側の部分が、この第一係合部を弾性変形させる際の外力を受け入れる入力部をなしている;
ことを特徴とする請求項3に記載の燃料供給装置。 - 前記燃料吸入部に前記接続部を接続させた状態で、前記入力部の少なくとも一方が前記燃料ポンプユニットの外周面よりも径方向外側に突出していることを特徴とする請求項4に記載の燃料供給装置。
- 前記接続部の前記燃料ポンプユニット側にある外周縁、および前記燃料ポンプユニットの何れか一方に設けられた誤組み防止用凸部と、
他方に設けられてかつ前記誤組み防止用凸部が嵌入可能な溝部と、
をさらに備え;
前記溝部の周方向の大きさが、前記誤組み防止用凸部の前記軸心回りでの回動を所定範囲だけ許容するように設定されている;
ことを特徴とする請求項1~請求項5の何れか1項に記載の燃料供給装置。 - 前記第一係合部が、前記接続部の軸心を中心として点対称となる位置に一対設けられると共に、これら第一係合部それぞれの径方向内面側に前記突起が突設され;
前記各突起の回転方向前側面が、回転方向に対して直交、または径方向内側に向かうに従い回転方向に向かって傾斜する第一傾斜面をなし;
前記燃料ポンプユニットに、前記第二係合部が一対設けられ;
前記各第二係合部の基端側に、前記各第一係合部を受け入れる凹部が形成される一方、前記各第二係合部の先端側に、前記凹部に挿入された前記各第一係合部の軸方向への抜けを規制する抜け止め壁が形成され;
前記各抜け止め壁の、前記各第一係合部を受け入れる側の側面が、回転方向に対して直交、または径方向外側に向かうに従い前記回転方向とは反対側に向かって傾斜する第二傾斜面をなしている;
ことを特徴とする請求項3に記載の燃料供給装置。
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BR112012019303B1 (pt) | 2021-01-19 |
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