JP2016113958A - Seal structure of fuel pump unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seal structure of a fuel pump unit capable of downsizing the attachment part of a unit case, and thereby attaining downsizing and wight saving of a fuel tank.SOLUTION: At a portion opposite to the outer peripheral edge part of a unit attachment port 55, among flange parts 53L-c, a locking projection part 60 is provided. A seal member 51 has a fitting hole 61 fitted to the locking projection part 60, an annular fuel seal part 62 preventing leakage of fuel from the unit attachment port 55 on the radial inside of the fitting hole 61, and an annular dust seal part 63 inhibiting enter of dust from the outside on the radial outside of the fitting hole 61. The formation portion of the fitting hole 61, the fuel seal part 62 and the dust seal part 63 are integrally formed.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a seal structure of a fuel pump unit attached to a fuel tank of a vehicle.

  A fuel pump unit for supplying fuel to the engine is attached to the fuel tank of the vehicle. In the fuel pump unit, a fuel pump main body that pumps fuel in the fuel tank is held in a unit case, and the unit case is attached to the fuel tank through a unit attachment port of the fuel tank. The part of the unit case exposed to the outside of the fuel tank is extended with a flange that faces the outer peripheral edge of the unit mounting port, preventing fuel leakage between the flange and the outer peripheral edge of the unit mounting port. A sealing member for interfacing is interposed (see, for example, Patent Document 1).

  In the fuel pump unit described in Patent Document 1, a bent portion that is bent toward the fuel tank side is provided on the outer peripheral edge of the flange portion of the unit case, and an annular seal member is arranged inside the bent portion. ing. The seal member of this fuel pump unit functions exclusively as a fuel seal that prevents leakage of fuel from the unit mounting port, and the bent portion of the flange portion functions as a dust seal that prevents dust from entering the seal member from the outside. To do.

JP 2005-113892 A

  However, in the fuel pump unit described in Patent Document 1, since a bent portion is provided in the flange portion of the unit case, and the dust seal is configured by the bent portion, the flange portion formed in the unit case becomes large. For this reason, the space occupied by the mounting portion of the unit case increases, and the weight of the entire unit case also increases.

  Accordingly, the present invention is intended to provide a fuel pump unit seal structure that can reduce the size and weight of the fuel tank by reducing the size of the mounting portion of the unit case.

  In the seal structure of the fuel pump unit according to the present invention, in order to solve the above problems, the unit case (53) holding the fuel pump body (52) penetrates the unit mounting opening (55) of the fuel tank (27). Then, a flange portion that is attached to the fuel tank (27) and exposed to the outside of the fuel tank (27) of the unit case (53) is opposed to the outer peripheral edge portion of the unit attachment port (55). 53L-c) and an annular seal member (51) is sandwiched between the flange portion (53L-c) and the outer peripheral edge portion of the unit mounting port (55), the flange portion (53L- c) is a seal structure of a fuel pump unit for a vehicle that is pressed and fixed to the outer peripheral edge of the unit attachment port (55), and the unit removal of the flange portion (53L-c). A locking convex portion (60) is provided at a portion facing the outer peripheral edge portion of the mouth (55), and the sealing member (51) is fitted to the locking convex portion (60). 61), an annular fuel seal portion (62) for preventing leakage of fuel from the unit attachment port (55) on the radially inner side of the fitting portion (61), and a diameter of the fitting portion (61) An annular dust seal portion (63) that prevents dust from entering from outside in the direction, and the fitting portion (61), the fuel seal portion (62), and the dust seal portion (63) are integrally formed. To be formed.

  As a result, the seal member (51) has a fitting portion (61) formed between the fuel seal portion (62) and the dust seal portion (63), and a locking projection (60) on the flange portion (53L-c) side. ) To be positioned. In this state, when the flange portion (53L-c) of the unit case (53) is pressed and fixed to the outer peripheral edge portion of the unit attachment port (55) of the fuel tank (27), the annular fuel seal portion (62) and the dust seal are formed. The portion (63) is in close contact with the flange portion (53L-c) and the outer peripheral edge portion of the unit mounting port (55). As a result, fuel leakage from the unit mounting opening (55) is blocked by the fuel seal portion (62), and entry of dust from the outside is blocked by the dust seal portion (63).

The dust seal part (63) is preferably formed to have substantially the same outer diameter as the flange part (53L-c).
In this case, the outer diameter of the flange portion (53L-c) on the unit case (53) side is reduced while ensuring the pressing force of the seal member (51) against the fuel seal portion (62) and the dust seal portion (63). Can do.

The outer peripheral edge of the unit mounting port (55) of the fuel tank (27) is provided with a stepped recess (27a-2), and a part of the dust seal portion (63) is the recess ( You may make it contact | abut to the bottom face of 27a-2).
In this case, it is possible to ensure a large height of the dust seal part (63) while suppressing the protruding height of the unit case (53) from the fuel tank (27). Accordingly, when the flange portion (53L-c) is pressed and fixed to the outer peripheral edge portion of the unit mounting port (55), the reaction force acting on the dust seal portion (63) increases, and the fuel seal portion (62) due to this increase. It is possible to suppress a decrease in the close force.

The recess (27a-2) is continuously formed on the outer peripheral edge of the unit mounting port (55) of the fuel tank (27) via an inclined portion (27a-3), and the dust seal portion ( 63) may be in contact with the inclined portion (27a-3).
In this case, the dust seal portion (63) abuts on the wide area portion of the inclined portion (27a-3), and the dust can be effectively prevented from entering.

A fixing plate (56) for pressing the flange portion (53L-c) in the direction of the fuel tank (27) is overlaid on the flange portion (53L-c), and the fixing plate (56) is attached to the flange portion. (53L-c) is fixed to the outer peripheral edge of the unit mounting port (55) by a fastening member (57, 58) at a radially outer position, and the seal member (51) and the flange (53L-c) ) May be positioned radially inward of the fastening and fixing positions of the fastening members (57, 58).
In this case, the diameter of the seal member (51) and the flange portion (53L-c) can be reduced.

A fixing plate (56) for pressing the flange portion (53L-c) in the direction of the fuel tank (27) is overlaid on the flange portion (53L-c), and the fixing plate (56) is attached to the flange portion. (53L-c) is fixed to the outer peripheral edge portion of the unit mounting port (55) by a fastening member (57, 58) at a position radially outward from the unit mounting port (55) of the fuel tank (27). An installation member (59) for installing the fastening member (57, 58) protrudes from a radially outer position of the recess (27a-2) in the outer peripheral edge of the dust seal part. The radially outer portion of (63) may be disposed in close proximity to the installation member (59) so as to be in contact therewith.
In this case, the flange portion (53L-c) is attached to the outer peripheral edge portion of the unit attaching port (55) via the fixing plate (56), and the fixing plate (56) is attached to the outer peripheral edge portion of the unit attaching port (55). Fastening members (57, 58) for mounting are arranged on the radially outer side than the seal member (51). Accordingly, the flange portion (53L-c) and the seal member (51) are compared with the case where the flange portion (53L-c) of the unit case (53) is directly attached to the fuel tank (27) with the fastening members (57, 58). ) Can be further reduced in diameter. In addition, since the radially outer portion of the dust seal portion (63) is disposed in close proximity to the installation member (59), the displacement of the dust seal portion (63) in the radially outer direction can be reduced. ) Can be regulated.

In the state where the unit case (53) is attached to the fuel tank (27), the upper end (63-E1) of the dust seal part (63) is connected to the fuel seal part (62). The lower end (62-E2) of the fuel seal portion (62) is positioned lower than the lower end (63-E2) of the dust seal portion (63). You may make it do.
In this case, since the upper and lower seal surfaces on the fuel seal portion (62) side adjacent to the unit mounting port (55) are positioned below the upper and lower seal surfaces on the dust seal portion (63) side, the fuel tank It becomes difficult for the fuel in (27) to flow from the fuel seal part (62) side to the dust seal part (63) side. For this reason, leakage of fuel can be prevented more advantageously.

A plurality of the fitting portions (61) are formed along the circumferential direction of the seal member (51), and are formed in an arc-shaped long hole shape along the circumferential direction of the seal member (51). A plurality of the locking projections (60) are formed along the circumferential direction of the flange portion (53L-c), and the shape in top view matches the shape of the long hole of the fitting portion (61). It may be formed in an arc shape.
In this case, since the top-view shape of the locking convex portion (60) is formed in an arc shape, and the fitting portion (61) is formed in an arc-shaped long hole shape, on the seal member (51) The position of the seal member (51) at the fitting portion between the locking projection (60) and the fitting portion (61) without increasing the radial separation width between the fuel seal portion (62) and the dust seal portion (63). Deviation can be advantageously prevented.

  According to the present invention, the fitting portion that is fitted to the locking projection of the flange portion, the fuel seal portion that prevents leakage of fuel on the radially inner side of the fitting portion, and the radially outer side of the fitting portion. Since the dust seal part that prevents dust from entering is formed integrally with the seal member, the flange part can be made smaller than when the dust seal part is formed integrally with the outer peripheral edge of the flange part on the unit case side. be able to. Therefore, according to the present invention, the mounting portion of the unit case can be reduced in size, so that the size and weight reduction around the fuel tank can be achieved.

1 is a side view of a motorcycle according to an embodiment of the present invention. 1 is a side view of a motorcycle according to an embodiment of the present invention. 1 is a plan view of a motorcycle according to an embodiment of the present invention. It is a longitudinal cross-sectional view which shows the attaching part of the fuel pump unit which concerns on one Embodiment of this invention. It is sectional drawing which expanded and showed the V section of FIG. 4 of the attaching part of the fuel pump unit which concerns on one Embodiment of this invention. 1 is a perspective view of a fuel pump unit according to an embodiment of the present invention. It is a perspective view of the seal member concerning one embodiment of this invention. It is a top view in the state where the seal member was attached to the fuel pump unit concerning one embodiment of this invention. It is a partial section perspective view of the attaching part of the fuel pump unit concerning one embodiment of this invention.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the drawings, arrow FR indicates the front of the vehicle, arrow UP indicates the upper side of the vehicle, and arrow LH indicates the left side of the vehicle.

First, the overall configuration of the vehicle according to this embodiment will be described with reference to FIGS. The vehicle according to this embodiment is a motorcycle that is one form of a saddle-ride type vehicle.
FIG. 1 is a left side view of a main part of a vehicle centering on a body frame portion of a motorcycle, and FIG. 2 is a left side view of the main part of the vehicle showing a state in which a part of a seat is lifted. FIG. 3 is a plan view of the main part of the vehicle body.

  In FIG. 1, a vehicle body frame F includes a front end head pipe 11, a main frame 12 branching left and right from the head pipe 11 and extending toward the rear of the vehicle body, and the vicinity of the front head pipe 11 of the main frame 12. One down frame 13 that extends obliquely downward from the position, a pair of left and right seat rails 14 that extends obliquely rearward and upward behind the main frame 12, and a rear end portion of the main frame 12 And a pair of left and right pivot plates 15 that connect the front end of the seat rail 14 and extend obliquely downward to the front.

  A steering shaft 16 is rotatably supported on the head pipe 11. The upper and lower ends of the steering shaft 16 are connected to a top bridge 17a and a bottom bridge 17b, respectively. The top bridge 17a and the bottom bridge 17b support the upper ends of a pair of left and right front forks 18, and a front wheel (not shown) is rotatably supported between the lower ends of the left and right front forks 18. A bar handle 19 is attached to the top bridge 17a. The front wheel can be turned by rotating the bar handle 19.

An air cleaner 20 and a storage box 21 are supported on the main frame 12. The storage box 21 is open on the upper side, and the upper opening thereof is closed by a box lid 22 so as to be freely opened and closed. The storage box 21 has a relatively large internal volume so that a helmet or the like can be stored therein.
Reference numeral 23 in the figure denotes a front top cover that covers the upper portion of the air cleaner 20 and the front portion of the box lid 22.

A fuel tank 27 is supported on the seat rail 14. A seat 28 is supported on the fuel tank 27. The seat 28 is formed long in the front-rear direction for passengers, the front part is a rider seat 30 (driver seat), and the rear part is a pillion seat 31 for passengers.
The pillion seat 31 can be flipped up and rotated via a hinge mechanism 31a provided on the rear end side. The pillion seat 31 also serves as a fueling lid, and at the time of fueling, the fueling cap 27b on the fuel tank 27 can be accessed by flipping the front side upward.

The fuel tank 27 is formed long in the front-rear direction over almost the entire length of the seat 28, and is disposed slightly inclined forward and downward along the seat rail 14. The fueling cap 27b is detachably attached to a fueling port (not shown) located at the upper part on the rear half side of the fuel tank 27.
The front half side of the fuel tank 27 is a large capacity portion located below the rider seat 30, and a fuel pump unit 50 described later is attached to the bottom wall 27a on the front side.

  A tank stay 33 is attached to the upper part of the rear end side of the main frame 12. The tank stay 33 supports the front end of the fuel tank 27. A seat stay 34 that extends obliquely upward and rearward is attached to the tank stay 33, and the seat stay 34 supports a lower front portion of the rider seat 30. A box stay 36 is attached to the seat stay 34 so as to extend obliquely upward. The storage box 21 is supported by a box stay 36 at its bottom rear end.

An engine 37 is disposed below the main frame 12. The engine 37 has an upper portion supported by the main frame 12, a front portion supported by the down frame 13, and a rear portion supported by the pivot plate 15. The vehicle body frame F has a diamond frame structure by using the engine 37 as a part of the frame structure.
1 is an exhaust pipe connected to a cylinder head of the engine 37.

The pivot plate 15 supports the front end portion of the swing arm 41 so as to be swingable by the pivot shaft 40. A rear wheel Wr is rotatably supported at the rear end of the swing arm 41. The rear wheel Wr is driven by the power of the engine 37 through a chain (not shown).
In addition, the code | symbol 43 in FIG. 1 is a cushion unit for rear wheels. The cushion unit 43 has an upper end supported by the vehicle body frame F and a lower end attached to a link mechanism 42 provided between the swing arm 41 and the pivot plate 15.
Further, reference numeral 44 in FIG. 3 is a front side cover that covers the vehicle body side portion on the front side of the storage box 21. The front side cover 44 is omitted in FIGS. 1 and 2 for convenience of illustration.

  FIG. 4 is a vertical cross-sectional view of the mounting portion of the fuel pump unit 50 in the fuel tank 27, and FIG. 5 is an enlarged view of the V portion of FIG. 6 is a perspective view of a part of the fuel pump unit 50, FIG. 7 is a perspective view of a seal member 51 attached to the fuel pump unit 50, and FIG. 8 is a fuel pump to which the seal member 51 is attached. 4 is a plan view of a unit 50. FIG. In the following description, “upper” and “lower” with respect to the fuel tank 27 and the fuel pump unit 50 mean up and down in a vehicle mounting state unless otherwise specified.

  In the fuel pump unit 50, a fuel pump main body 52 that sucks the fuel in the fuel tank 27 and discharges it to the outside is held inside the unit case 53 together with a relief valve, passage parts and the like (not shown). The unit case 53 includes an upper case 53U to which a fuel pump main body 52, a float mechanism 54 (see FIGS. 1 and 2) for measuring the remaining fuel in the fuel tank 27, and the like, and an outer periphery of the lower edge of the upper case 53U. A lower case 53L that is fitted and fixed to the surface and covers the lower side of the upper case 53U.

  The lower case 53L includes a substantially cylindrical peripheral wall 53L-a that is fitted and fixed to the upper case 53U, a bottom wall 53L-b that closes a lower end of the peripheral wall 53L-a, and a bottom wall 53L-b. And an annular flange portion 53L-c that protrudes radially outward from the outer peripheral surface of the peripheral wall portion 53L-a. The lower case 53L is formed in a bottomed cylindrical shape by a peripheral wall portion 53L-a and a bottom wall portion 53L-b, and an annular flange portion 53L-c projects radially outward from the outer peripheral surface of the bottom portion of the bottomed cylinder. Yes.

  The unit case 53 is attached to the fuel tank 27 through a substantially circular unit attachment port 55 formed in the bottom wall 27 a of the fuel tank 27. In the unit case 53, the entire upper case 53U and the peripheral wall portion 53L-a of the lower case 53L are disposed in the fuel tank 27, and the bottom wall portion 53L-b and the flange portion 53L-c of the lower case 53L are the fuel tank. 27 is arranged outside. Therefore, the flange portion 53L-c is provided in a portion of the unit case 53 exposed to the outside of the fuel tank 27. The flange portion 53 </ b> L-c faces the outer peripheral edge portion of the unit attachment port 55 in the bottom wall 27 a of the fuel tank 27.

  Between the upper surface of the flange portion 53L-c of the unit case 53 and the lower surface of the outer peripheral edge portion of the unit mounting port 55, an annular seal member 51 is interposed from an elastic and liquid-tight resin material. . An annular setting plate 56 that is a metal fixing plate is overlaid on the lower surface of the flange portion 53L-c of the unit case 53, and the setting plate 56 is fastened and fixed to the bottom wall 27a of the fuel tank 27. It is like that. The flange portion 53L-c receives a pressing force from the setting plate 56, and is pressed and fixed to the outer peripheral edge portion of the unit mounting port 55 in a state where the seal member 51 is sandwiched.

  In the setting plate 56, the upper surface side of the inner peripheral edge is thinned in an annular shape, and a step-shaped recess 56a is formed near the center of the upper surface by the thinning. A flange portion 53L-c of the unit case 53 is accommodated and disposed in the recess 56a of the setting plate 56, and a thick portion radially outward from the recess 56a is fastened and fixed to the bottom wall 27a of the fuel tank 27. ing.

The fastening member that fastens and fixes the setting plate 56 to the bottom wall 27a of the fuel tank 27 is screwed into a plurality of bolts 57 whose shaft portions protrude downward from the lower surface side of the fuel tank 27 and the shaft portions of the respective bolts 57. And a nut 58 to be formed. The shaft portion of each bolt 57 passes through an insertion hole (not shown) provided in the thick outer peripheral edge portion of the setting plate 56, and a nut 58 is tightened to the penetrated end portion.
In the case of this embodiment, the bolt 57 is held by a concave bent portion 59a of a set ring 59 (installation member) fixed to the lower surface of the bottom wall 27a of the fuel tank 27 by welding. The set ring 59 is formed with an inner diameter larger than the inner diameter of the unit mounting port 55 and is mounted at a position concentric with the unit mounting port 55 in the bottom wall 27a.

  As shown in FIG. 5, in the bottom wall 27 a of the fuel tank 27, an annular region 27 a-1 having a predetermined width adjacent to the unit attachment port 55 is formed flat. In the radially outer portion of the annular region 27a-1, an inclined portion 27a-3 that is inclined upward toward the radially outer side is formed, and a recess 27a that is recessed upward via the inclined portion 27a. -2 is formed continuously. The set ring 59 is attached to a position in the hollow portion 27a-2 that is slightly spaced radially outward from the inclined portion 27a-3.

  By the way, on the upper surface of the flange portion 53L-c of the unit case 53, a plurality of locking convex portions 60 project from the circumferential direction of the flange portion 53L-c. The locking projection 60 is formed in an arc shape along the circumferential direction of the flange portion 53L-c when viewed from the top, and is disposed on the flange portion 53L-c at regular intervals.

  In addition, the seal member 51 has a plurality of fitting holes 61 (fitting portions) that are fitted with the locking projections 60 on the flange portion 53L-c. The fitting hole 61 is formed in an arc-shaped long hole shape along the circumferential direction of the seal member 51, and the engagement protrusion 60 and the engagement protrusion 60 are in one-to-one correspondence with the engagement protrusion 60 on the flange portion 53L-c. The same number is formed.

  The seal member 51 includes an annular fuel seal portion 62 and a dust seal portion 63 on the radially inner side and the radially outer side across the arrangement portion of the plurality of fitting holes 61. The fuel seal portion 62 is disposed near the outside of the unit attachment port 55 of the fuel tank 27 and functions to prevent leakage of fuel from the unit attachment port 55. Further, the dust seal portion 63 functions to prevent dust from entering from the outside toward the fuel seal portion 62 in the radially outer region of the fuel seal portion 62 and the plurality of fitting holes 61. The annular fuel seal portion 62 and the dust seal portion 63 are provided concentrically and are connected to each other by a partition wall portion that separates the fitting holes 61 adjacent in the circumferential direction. The fitting hole 61 (fitting hole forming portion), the fuel seal portion 62, and the dust seal portion 63 are integrally formed of a resin material.

FIG. 9 is a partial cross-sectional perspective view of the mounting portion of the fuel pump unit 50, in which the initial shape before assembly of the seal member 51 is indicated by phantom lines.
As shown also in the drawing, the upper and lower thicknesses of the region near the fitting hole 61 in the radial direction of the seal member 51 are formed to be substantially constant. Hereinafter, this region of the seal member 51 is referred to as a reference thick portion 51t. In the fuel seal portion 62, the upper and lower thicknesses gradually increase from the radially inner end adjacent to the reference thick portion 51t toward the radially outer end. The dust seal portion 63 has an annular seal lip in which the upper surface side protrudes greatly from the portion adjacent to the reference thick portion 51t toward the radially inner end, and the radially outer end protrudes upward due to the protrusion. 63a is formed.

  In the radially inner region of the locking projection 60 of the flange portion 53L-c, the fuel seal portion 62 is in contact with the upper surface of the flange portion 53L-c and the upper surface side is the lower surface of the bottom wall 27a of the fuel tank 27. It contacts the annular region 27a-1. When the unit case 53 is attached to the fuel tank 27, if the flange portion 53L-c of the unit case 53 is pressed toward the outer peripheral edge of the unit attachment port 55 through the setting plate 56, the fuel seal portion 62 is crushed in the vertical direction. In close contact with the flange portion 53L-c and the annular region 27a-1.

  The dust seal portion 63 has a lower surface in contact with the upper surface of the flange portion 53L-c in the radially outer region of the locking projection 60 of the flange portion 53L-c, and a seal lip 63a on the upper surface side of the bottom wall of the fuel tank 27. Of 27a, it abuts on the inclined portion 27a-3 and the bottom surface of the recessed portion 27a-2. When the unit case 53 is attached to the fuel tank 27, when the flange portion 53L-c of the unit case 53 is pressed through the setting plate 56 toward the outer peripheral edge of the unit attachment port 55, the seal lip 63a of the dust seal portion 63 is bent. It is in close contact with the inclined portion 27a-3 and the bottom surface of the recessed portion 27a-2.

  Further, the dust seal portion 63 (the seal member 51) is formed to have substantially the same outer diameter as the flange portion 53L-c of the unit case 53. When a pressing force is applied to the seal member 51 from the flange portion 53L-c when the unit case 53 is attached to the fuel tank 27, the seal lip 63a is attached to the dust seal portion 63 from the vicinity of the radially outer end of the flange portion 53L-c. The load in the direction of pressing against the bottom surface of the recess 27a-2 is reliably transmitted.

  By the way, the bolt setting ring 59 which is welded and fixed to the hollow portion 27a-2 of the fuel tank 27 is located at a part of the hollow portion 27a-2 that is slightly separated from the inclined portion 27a-3. The seal lip 63a (dust seal portion 63) of the seal member 51 abuts at a position close to the set ring 59 in the recess portion 27a-2. In addition, when the bending of the seal lip 63a is partially large, the seal lip 63a abuts on the set ring 59 to restrict excessive bending. Further, as shown in FIG. 5, the seal member 51 and the funnel portion 53 </ b> L-c that supports the seal member 51 are located radially inward from the fastening and fixing position by the bolt 57 and the nut 58. Reference numeral c-1 in FIG. 5 is a fastening center of a fastening portion by the bolt 57 and the nut 58.

  5 and 9, when the unit case 53 is attached to the fuel tank 27, the upper end 63-E1 of the dust seal portion 63 (seal lip 63a) is connected to the fuel seal portion 62. The lower end 62-E2 of the fuel seal portion 62 is positioned lower than the lower end 63-E2 of the dust seal portion 63.

When the unit case 53 is attached to the fuel tank 27, the peripheral wall portion 53L-a of the lower case 53L is connected to the fuel tank 27 in a state where the seal member 51 is set on the flange portion 53L-c of the lower case 53L. Is inserted into the unit mounting port 55 from below. At this time, the sealing member 51 is locked and fixed by fitting the locking projection 60 on the flange 53L-c into the fitting hole 61.
Thereafter, the setting plate 56 superimposed on the outer peripheral edge portion on the lower surface side of the flange portion 53L-c is fastened and fixed to the set ring 59 of the bottom wall 27a of the fuel tank 27 by the bolt 57 and the nut 58. At this time, the fuel seal portion 62 and the dust seal portion 63 of the seal member 51 are in close contact with the flange portion 53L-c and the outer peripheral edge portion of the unit attachment port 55.

As described above, in the seal structure of the fuel pump unit 50 according to this embodiment, the fitting hole 61 to be fitted to the locking convex portion 60 of the flange portion 53L-c is provided in the seal member 51, and its seal A fuel seal portion 62 is provided on the radially inner side of the fitting hole 61 of the member 51, and a dust seal portion 63 is provided on the radially outer side of the fitting hole 61. For this reason, the flange portion 53L-c can be reduced in size as compared with the case where a portion for preventing dust from entering is integrally formed on the outer edge of the flange portion, separately from the seal member for preventing fuel leakage. .
Therefore, by adopting the seal structure according to this embodiment, the mounting portion of the unit case 53 can be reduced in size, and as a result, reduction in size and weight around the fuel tank 27 of the vehicle can be achieved.

  Further, in the seal structure according to this embodiment, since the dust seal portion 63 of the seal member 51 is formed to have substantially the same outer diameter as the flange portion 53L-c, the fuel seal portion 62 and the dust seal portion 63 by the flange portion 53L-c. The outer diameter of the flange portion 53L-c can be reduced while ensuring a sufficient pressing force against the flange portion 53L-c. For this reason, the attaching part of the unit case 53 can be further reduced in size.

Further, in the seal structure according to this embodiment, a hollow portion 27a-2 that is recessed in a step shape is provided at the outer peripheral edge portion of the unit mounting port 55 of the fuel tank 27, and a part of the dust seal portion 63 of the seal member 51 ( The seal lip 63a) comes into contact with the bottom surface of the recess 27a-2. For this reason, the vertical height of the dust seal part 63 can be secured large while suppressing the amount of protrusion of the unit case 53 from the bottom wall 27a of the fuel tank 27.
Therefore, by adopting this seal structure, when the flange portion 53L-c is pressed and fixed to the outer peripheral edge portion of the unit mounting port 55, the reaction force acting on the dust seal portion 63 is increased and the fuel seal portion 62 side is increased. It is possible to suppress a decrease in the close contact force.

  Furthermore, in the seal structure according to this embodiment, an inclined portion 27a-3 is provided on the outer peripheral edge portion of the unit mounting port 55 of the fuel tank 27, and the recessed portion 27a-2 is continuous through the inclined portion 27a-3. In addition, a part of the dust seal part 63 (seal lip part 63a) also comes into contact with the inclined part 27a-3. For this reason, the dust seal | sticker part 63 contact | abuts in the large area part of the inclination part 27a-3, and can prevent the approach of dust efficiently.

  In the seal structure according to this embodiment, the setting plate 56 overlaid on the flange portion 53L-c has a bolt 57 and a nut 58 at the outer peripheral edge portion of the unit mounting port 55 at a radially outer position than the flange portion 53L-c. The seal member 51 and the flange portion 53L-c are positioned radially inward from the fastening and fixing position by the bolt 57 and the nut 58. For this reason, the diameter of the seal member 51 and the flange portion 53L-c can be reduced by adopting this structure.

Furthermore, in the seal structure according to this embodiment, the setting plate 56 that is overlapped with the flange portion 53L-c has a bolt 57 and a nut 58 at the outer peripheral edge portion of the unit mounting port 55 at a radially outer position than the flange portion 53L-c. The set ring 59 for bolt installation is attached to the radially outer position of the recess 27 a-2, and the radially outer portion of the dust seal part 63 of the seal member 51 is disposed close to the set ring 59. Has been. For this reason, the flange portion 53L-c and the seal member 51 can be made smaller in diameter (smaller in diameter), and the positional displacement of the seal lip 63a in the radially outer direction of the seal member 51 can be reduced by the set ring 59, It can also be effectively regulated by the bent portion 59a bulging downward.
Therefore, by adopting this seal structure, it is possible to further reduce the size of the mounting portion of the unit case 53 and ensure stable sealing performance of the dust seal portion 63.

  In the seal structure according to this embodiment, the upper end 63 -E 1 of the dust seal portion 63 of the seal member 51 is more than the upper end 62 -E 1 of the fuel seal portion 62 when the unit case 53 is attached to the fuel tank 27. Also, the lower end 62-E2 of the fuel seal portion 62 is set to be positioned below the lower end 63-E2 of the dust seal portion 63. For this reason, since the fuel seal part 62 becomes lower than the dust seal part 63 on the outer peripheral side, the fuel in the fuel tank 27 is advantageously prevented from flowing from the fuel seal part 62 side toward the dust seal part 63 side. Can do. Further, since the upper end 63-E1 of the dust seal part 63 is positioned above the upper end 62-E1 of the fuel seal part 62, the dust blowing up toward the lower surface of the bottom wall 27a of the fuel tank 27 is fuel seal. It is possible to effectively suppress entry in the direction of the portion 62.

In the embodiment described here, the unit case 53 is attached to the bottom wall 27 a of the fuel tank 27, but the unit case 53 can also be attached to the upper wall side of the fuel tank 27. In this case, although the vertical relationship between the wall of the fuel tank 27 and the flange portion 53L-c of the unit case 53 is reversed, a seal structure substantially similar to the above can be employed.
Also in this case, the upper end of the dust seal portion 63 of the seal member 51 is positioned above the upper end of the fuel seal portion 62, and the lower end of the fuel seal portion 62 is positioned below the lower end of the dust seal portion 63. Is desirable. Also at this time, since the fuel seal portion 62 is lower than the dust seal portion 63 on the outer peripheral side, the fuel in the fuel tank 27 can be prevented from flowing from the fuel seal portion 62 side toward the dust seal portion 63 side. .

Furthermore, in the case of the seal structure according to this embodiment, a plurality of fitting holes 61 of the seal member 51 are formed along the extending direction of the seal member 51, and an arc shape along the circumferential direction of the seal member 51 is formed. It is formed in a long hole shape, and the locking projections 60 on the flange 53L-c side are formed so as to match the number and shape of the fitting holes 61 on the seal member 51 side. For this reason, the positional displacement of the seal member 51 is effectively performed at the fitting portion between the locking projection 60 and the fitting hole 61 without increasing the radial separation width between the fuel seal portion 62 and the dust seal portion 63 on the seal member 51. Can be prevented.
Therefore, by adopting this structure, the seal member 51 and the flange portion 53L-c can be further downsized (smaller diameter).

  In addition, this invention is not limited to said embodiment, A various design change is possible in the range which does not deviate from the summary. For example, in the above-described embodiment, the fitting hole 61 penetrating the seal member 51 in the vertical direction is employed as the fitting portion that fits with the locking convex portion 60 of the flange portion 53L-c. The part may be a hole that is recessed from below to above.

DESCRIPTION OF SYMBOLS 27 ... Fuel tank 27a-2 ... Indentation part 27a-3 ... Inclination part 50 ... Fuel pump unit 51 ... Seal member 52 ... Fuel pump main body 53 ... Unit case 53L-c ... Flange part 55 ... Unit attachment port 56 ... Setting plate ( Fixed plate)
57 ... Bolt (fastening member)
58 ... Nut (fastening member)
59 ... Set ring (installation member)
60 ... Locking convex part 61 ... Fitting hole (fitting part)
62 ... Fuel seal part 62-E1 ... Upper end 62-E2 ... Lower end 63 ... Dust seal part 63-E1 ... Upper end 63-E2 ... Lower end

Claims (8)

A unit case (53) for holding the fuel pump body (52) is attached to the fuel tank (27) through the unit attachment port (55) of the fuel tank (27),
A flange portion (53L-c) facing the outer peripheral edge portion of the unit attachment port (55) is provided in a portion of the unit case (53) exposed to the outside of the fuel tank (27),
With the annular seal member (51) sandwiched between the flange portion (53L-c) and the outer peripheral edge of the unit mounting port (55), the flange portion (53L-c) is connected to the unit mounting port ( 55) in the seal structure of the fuel pump unit for a vehicle pressed and fixed to the outer peripheral edge portion,
A locking projection (60) is provided at a portion of the flange portion (53L-c) that faces the outer peripheral edge of the unit mounting port (55).
The seal member (51) includes a fitting portion (61) fitted to the locking convex portion (60), and a radial inner side of the fitting portion (61) from the unit attachment port (55). An annular fuel seal portion (62) for preventing fuel leakage, and an annular dust seal portion (63) for preventing dust from entering from outside in the radial direction of the fitting portion (61),
The fuel pump unit seal structure, wherein the fitting portion (61), the fuel seal portion (62), and the dust seal portion (63) are integrally formed.   2. The fuel pump unit seal structure according to claim 1, wherein the dust seal portion is formed to have substantially the same outer diameter as the flange portion. The outer peripheral edge portion of the unit mounting port (55) of the fuel tank (27) is provided with a recessed portion (27a-2) that is recessed in a step shape,
3. The fuel pump unit seal structure according to claim 1, wherein a part of the dust seal portion (63) abuts against a bottom surface of the recess portion (27 a-2). The recess (27a-2) is continuously formed on the outer peripheral edge of the unit attachment port (55) of the fuel tank (27) via an inclined portion (27a-3),
4. The fuel pump unit seal structure according to claim 3, wherein a part of the dust seal portion (63) abuts on the inclined portion (27 a-3). The flange portion (53L-c) is overlaid with a fixing plate (56) that presses the flange portion (53L-c) toward the fuel tank (27),
The fixing plate (56) is fixed to the outer peripheral edge portion of the unit mounting port (55) by fastening members (57, 58) at a radially outer position than the flange portion (53L-c),
The said sealing member (51) and the said flange part (53L-c) are each located in the radial inside rather than the fastening fixing position of the said fastening member (57,58), respectively. The fuel pump unit seal structure described in 1. The flange portion (53L-c) is overlaid with a fixing plate (56) that presses the flange portion (53L-c) toward the fuel tank (27),
The fixing plate (56) is fixed to the outer peripheral edge portion of the unit mounting port (55) by fastening members (57, 58) at a radially outer position than the flange portion (53L-c),
In order to install the fastening members (57, 58) at the radially outer position of the recess (27a-2) in the outer peripheral edge of the unit mounting port (55) of the fuel tank (27). The installation member (59) is projected,
The fuel pump unit according to any one of claims 3 to 5, wherein a radially outer portion of the dust seal portion (63) is disposed adjacent to the installation member (59) so as to be in contact therewith. Seal structure.   In the state where the unit case (53) is attached to the fuel tank (27), the upper end (63-E1) of the dust seal part (63) is connected to the fuel seal part (62). The lower end (62-E2) of the fuel seal portion (62) is positioned lower than the lower end (63-E2) of the dust seal portion (63). The fuel pump unit seal structure according to any one of claims 1 to 6, wherein the seal structure is a fuel pump unit. A plurality of the fitting portions (61) are formed along the circumferential direction of the seal member (51), and are formed in an arc-shaped long hole shape along the circumferential direction of the seal member (51).
A plurality of the locking projections (60) are formed along the circumferential direction of the flange portion (53L-c), and the shape in top view matches the shape of the long hole of the fitting portion (61). 8. The fuel pump unit seal structure according to claim 1, wherein the seal structure is formed in an arc shape.

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