CN220452070U - Fuel supply device - Google Patents

Abstract

The present utility model relates to a fuel supply device that suppresses relative rotation of a cylinder with respect to a cylinder by a plurality of ribs formed on an inner surface of the cylinder, wherein a fitting structure of the cylinder with respect to the cylinder is added. This improves the effect of suppressing relative rotation of the columnar body with respect to the tubular body, and suppresses rattling caused by the relative rotation. A connecting member (4) that connects the cover member (2) and the pump unit (3) to each other is provided with a cylindrical body (10) and a columnar body (20) that is fitted into and inserted into the cylindrical body. The columnar body has a claw (21) at its upper end, and the tubular body has an engagement protrusion (12) which engages with the claw to prevent the columnar body from being separated from the tubular body. The cylindrical body is provided with a plurality of ribs (11) protruding on the inner wall thereof so as to surround the outer peripheral surface of the cylindrical body and extending along the insertion direction of the cylindrical body into the cylindrical body. The columnar body has a protrusion (22) protruding from the outer peripheral surface thereof and sandwiched between two mutually adjacent ribs.

Description

Fuel supply device

Technical Field

The technology disclosed in this specification relates to a fuel supply apparatus.

Background

The fuel supply device provided in the fuel tank is configured such that a pump unit is mounted on the bottom of the fuel tank, and a fuel pipe for guiding the fuel drawn up by the pump unit to the engine penetrates the ceiling of the fuel tank. The fuel pipe penetrates the top plate of the fuel tank, and the opening penetrating the top plate is closed by a cover member. The cover member and the pump unit are connected by a connecting member to form a single unit. The coupling member is configured to be vertically retractable so that the pump unit can be placed on the bottom of the fuel tank regardless of the depth of the fuel tank.

Patent document 1 discloses the following fuel supply device: the columnar body fixed to the pump unit in the upward direction is fitted into the cylindrical portion of the cylindrical body provided in the downward direction of the cover member, so that the insertion amount is freely changed. Here, the cylindrical body and the column form a connecting member. Further, an engaging portion and an engaged portion which engage with each other in the reverse insertion direction of the columnar body are provided at the lower end portion of the cylindrical body and the upper end portion of the columnar body, so that the pump unit can be held in a suspended state with respect to the cover member. The columnar body is formed in a quadrangular cylindrical shape, and does not rotate relative to the cylindrical body in a state of being inserted into the cylindrical body. For this purpose, a plurality of ribs protruding toward the outer peripheral surface so as to surround the outer peripheral surface of the quadrangular cylindrical body are integrally formed on the cylindrical inner surface so as to extend in the up-down direction. The reason why the shape for preventing the relative rotation is formed by the plurality of ribs is to reduce the sliding resistance by reducing the contact area when the columnar body is inserted and slid with respect to the cylindrical body, and to suppress the occurrence of the sliding sound as an abnormal sound.

Prior art literature

Patent literature

Patent document 1: japanese patent application laid-open No. 2021-11851

Disclosure of Invention

Problems to be solved by the utility model

In the fuel supply device of patent document 1, since the shape for preventing the relative rotation is formed by the plurality of ribs, the contact area when the columnar body is inserted into and slid with respect to the cylindrical body is reduced, and therefore, the effect of suppressing the relative rotation is reduced, and the occurrence of the small relative rotation cannot be completely prevented. That is, there is a problem that rattling occurs with relative rotation of the columnar body with respect to the cylindrical body.

The technical problem disclosed in the present specification is to add a fitting structure of a columnar body to a cylindrical body in a fuel supply device in which the relative rotation of the columnar body to the cylindrical body is suppressed by a plurality of ribs formed on the inner surface of the cylindrical body. This improves the effect of suppressing relative rotation of the columnar body with respect to the tubular body, and suppresses rattling caused by relative rotation of the columnar body with respect to the tubular body.

Solution for solving the problem

In order to solve the above-described problems, the fuel supply device disclosed in the present specification adopts the following means.

The fuel supply device according to claim 1 includes: a lid member fixed to the top plate so as to close an opening penetrating the top plate of the fuel tank; a pump unit that can be placed on a floor plate in a fuel tank and that includes a fuel pump that draws fuel in the fuel tank; and a coupling member that couples the cover member and the pump unit to each other, the coupling member including: a cylindrical body having an opening portion facing downward on a lower surface of the cover member; and a cylindrical body having a lower end portion coupled to the pump unit, an upper end portion fitted and inserted into the cylindrical body from an opening portion of the cylindrical body, the cylindrical body having a claw protruding from an outer peripheral surface of an upper end portion toward an inner wall of the cylindrical body, the cylindrical body having an engagement protrusion, the engagement protrusion being engaged with the claw to prevent the cylindrical body from being separated from the state of being inserted into the cylindrical body when the cylindrical body is inserted into a position where a space capable of further inserting the cylindrical body remains in the cylindrical body, the cylindrical body having a plurality of ribs protruding from an outer peripheral surface of the cylindrical body in a state of being inserted into the cylindrical body so as to surround the outer peripheral surface of the cylindrical body, the cylindrical body extending in an insertion direction into the cylindrical body along the outer peripheral surface of the cylindrical body, the protrusion having a protrusion protruding from the outer peripheral surface of the cylindrical body toward the inner wall of the cylindrical body, and being sandwiched between two adjacent ribs of the plurality of ribs.

According to the above-described claim 1, the projection is provided on the outer peripheral surface of the columnar body, and the projection is sandwiched between two adjacent ribs of the plurality of ribs formed protruding into the tubular body. Therefore, when the columnar body is relatively rotated in a state of being inserted into the tubular body, the protrusion engages with the rib on the rotation direction side, and the relative rotation is suppressed. Thus, the occurrence of rattling with the relative rotation can be suppressed. Each rib extends along the insertion direction of the columnar body, and the protrusion is always clamped between the adjacent ribs regardless of the amount of the columnar body inserted into the cylindrical body. Therefore, the above-described rattling can be suppressed regardless of the amount of insertion of the columnar body.

In claim 2, in the above-described claim 1, the protrusion has the same shape as the claw, and when the protrusion is inserted into the cylindrical body in a positional relationship in which the protrusion engages with the engagement protrusion, the claw is arranged so as to be sandwiched between two adjacent ribs.

According to claim 2, when the protrusion is made to function as a claw, the claw is held between two adjacent ribs, and the protrusion can function similarly. Thus, the fuel supply device can be used by switching between a so-called coaxial type in which the positions of the cover member and the pump unit in the vertical direction are identical to each other and a so-called offset type in which the positions are not identical to each other. In any state, the projection or the claw is engaged with the rib, so that the rattling caused by the relative rotation of the cylindrical body and the tubular body can be suppressed.

With regard to claim 3, in claim 2, the columnar body has a quadrangular cylindrical shape inserted into the opening of the columnar body, and the claw and the protrusion are provided on opposite wall surfaces of the quadrangular cylindrical shape of the columnar body.

According to claim 3, when the cylindrical body is inserted into the cylindrical body, the fuel supply device can be switched between the coaxial type and the offset type for use by rotating the cylindrical body by 180 degrees. Further, in any type of state, the occurrence of rattling due to the relative rotation of the columnar body and the tubular body can be suppressed.

With regard to claim 4, in claim 2, a plurality of the protrusions are formed so as to be dispersed in the circumferential direction of the outer peripheral surface of the columnar body, and the protrusions are sandwiched between two adjacent ribs, respectively.

According to the above-described claim 4, the rattling caused by the relative rotation of the columnar body and the tubular body can be strongly suppressed by the plurality of projections.

With regard to claim 5, in the above-described claim 4, the claw and the plurality of protrusions are arranged at equal intervals in the circumferential direction of the outer peripheral surface of the columnar body.

According to the above-described claim 5, the plurality of projections and the claws are arranged at equal intervals. Therefore, by changing the relative angle of the insertion state of the columnar body with respect to the cylindrical shape, the fuel supply device can be switched between the coaxial type and the offset type for use, and the offset amount of the pump unit with respect to the cover member when the offset type is selected from a plurality of stages.

Drawings

Fig. 1 is a plan view showing embodiment 1.

Fig. 2 is a cross-sectional view taken along line II-II of fig. 1.

Fig. 3 is an enlarged sectional view of line III-III of fig. 2.

Fig. 4 is an enlarged cross-sectional view of line IV-IV of fig. 2.

Fig. 5 is an enlarged view of the V portion of fig. 2.

Fig. 6 is an enlarged perspective view of the columnar body of embodiment 1.

Fig. 7 is a perspective view of the case where the correspondence relationship between the cover member and the pump unit is offset in embodiment 1.

Fig. 8 is a perspective view of the case where the correspondence relationship between the cover member and the pump unit is coaxial in embodiment 1.

Fig. 9 is a cross-sectional view corresponding to fig. 3 showing embodiment 2.

Fig. 10 is a cross-sectional view corresponding to fig. 3 showing embodiment 3.

Description of the reference numerals

1. A fuel supply device; 2. a cover member; 2a, a flange part; 3. a pump unit; 4. a connecting member; 5. a float; 10. 110, 210, a cylinder; 10a, a slit; 10b, upper top; 10c, a lower end opening; 11. a rib; 12. an engagement protrusion; 12a, an inner inclined surface; 12b, an engagement portion; 12c, a lower end; 12d, upper end; 20. 120, 220, a columnar body; 20a, bottom of lower end; 21. a claw; 21a, a top inclined surface; 21b, jaw; 22. a protrusion; 23. a pedestal; 31. a coil spring; 32. a support post; 41. a container; 41a, a column body receiving part; 41b, reinforcing ribs; 42. a fuel pump; 43. a bottom mask; 51. a top plate; 51a, openings; 52. a bottom plate.

Detailed Description

< integral Structure of embodiment 1 >

Fig. 1 and 2 show a fuel supply device 1 according to embodiment 1. The fuel supply device 1 supplies fuel from a fuel tank to a gasoline engine of a vehicle, and includes a pump unit 3 having a fuel pump 42 built therein, a lid member 2 fixed to a top plate 51 of the fuel tank, and a connecting member 4 connecting the pump unit 3 and the lid member 2. The pump unit 3, the cover member 2, and the coupling member 4 are formed of resin as a whole.

In the fuel supply apparatus 1, the pump unit 3 is inserted into the fuel tank through an opening 51a formed in the top plate 51 of the fuel tank in a state where the cover member 2 and the pump unit 3 are coupled by the coupling member 4. After that, the opening 51a is closed by the cover member 2, and in this position, the cover member 2 is fixed to the top plate 51. In this state, the bottom cover 43 provided as the bottom surface of the pump unit 3 is brought into contact with the bottom plate 52 in the fuel tank by the spring force of the coupling member 4. A float 5 for measuring the remaining amount of fuel in the fuel tank is provided at the side of the pump unit 3. Here, the cover member 2, the pump unit 3, and the float 5 are basically the same as the known cover member, pump unit, and float (for example, japanese patent No. 7046778, japanese patent application laid-open No. 2021-11851), and detailed description thereof is omitted.

Structure of connecting Member 4

The connecting member 4 is composed of a cylindrical body 10 and a columnar body 20. The cylindrical body 10 is formed in a cylindrical shape (see fig. 2 and 3) such that it protrudes downward by resin molding on the bottom surface of the disk-shaped cover member 2 as a whole. The lower end portion of the columnar body 20 is joined to the pump unit 3 and is formed in a quadrangular cylindrical shape toward the upper side (see fig. 2 and 4). The upper end portion of the columnar body 20 is fitted into a lower end opening (corresponding to the opening of claim 1) 10c of the tubular body 10 to form the coupling member 4. A plurality of flange portions 2a are integrally formed on the lower surface of the lid member 2 so as to extend downward, and the flange portions 2a serve as guides when the lid member 2 is covered on the opening 51a of the fuel tank (see fig. 2, 3, 7, and 8). The flange portion 2a is partially integrated with the tubular body 10.

As shown in fig. 6, the columnar body 20 is a quadrangular cylindrical body as a whole, and the claw 21 and the projection 22 are integrally formed so as to project outward from opposite wall outer surfaces of the upper distal end portion. The claw 21 and the protrusion 22 are formed in the same shape and are axisymmetric to each other. A cake-shaped pedestal 23 is integrally formed at the lower end of the columnar body 20. The pedestal 23 is fitted and fixed to a column receiving portion 41a (see fig. 2) formed in a partial recess of the container 41 of the pump unit 3. In the portion of the container 41 where the column receiving portion 41a is formed, in order to secure the strength of the column receiving portion 41a in the state of receiving the pedestal 23, a reinforcing rib 41b is formed at a position corresponding to the side surface of the pedestal 23 (see fig. 4, 7, 8). The reinforcing ribs 41b are formed in three on each of both side portions sandwiching the pedestal 23 in a shape extending along the outer periphery of the pedestal 23, and 6 in total are formed.

As shown in fig. 2, 3, and 5, a plurality of ribs 11 are provided on the inner wall surface of the tubular body 10 so as to extend parallel to each other along the insertion (up-down) direction of the columnar body 20. The ribs 11 are formed in a plurality so as to surround the columnar body 20 toward the outer peripheral surface of the columnar body 20 inserted into the tubular body 10. Specifically, as shown in fig. 3, two pieces are formed corresponding to four sides of the columnar body 20, and a total of 8 pieces are formed. Further, a slit 10a is formed at a part of the cylindrical body 10 along the insertion direction of the columnar body 20. The slit 10a is formed in a portion of the tubular body 10 other than the upper and lower end portions, and is formed at a position corresponding to the outer peripheral side of the disk-shaped cover member 2. Further, slits 10a are formed between mutually adjacent ribs 11.

As shown in fig. 5, an engagement protrusion 12 that engages with a claw 21 of a columnar body 20 inserted into the tubular body 10 in the insertion direction is formed at the lower end portion of the slit 10a. The slit 10a is necessary for moving a slide core, which is a mold for molding the engaging protrusion 12 with resin. The engaging protrusion 12 is formed long in the insertion direction of the cylindrical body 20, the lower end portion 12c is integrated with the cylindrical body 10, and the upper end portion 12d protrudes into the cylinder of the cylindrical body 10 as a free end. Further, as shown by the arrow in fig. 5, the engaging protrusion 12 can be elastically deformed to the outside of the tubular body 10. Therefore, when the columnar body 20 is inserted into the tubular body 10, the tip inclined surface 21a of the claw 21 abuts against the inner inclined surface 12a of the engagement projection 12, and the engagement projection 12 is elastically deformed in the direction of the arrow, so that the columnar body 20 can be inserted into the tubular body 10. After insertion, as shown in fig. 5, the engaging projection 12 returns to the illustrated position, and therefore, when the column 20 moves in a direction (downward) of being separated from the inside of the tubular body 10, the jaw 21b on the lower surface of the claw 21 engages with the engaging portion 12b on the upper surface of the engaging projection 12, thereby preventing the column 20 from being separated from the inside of the tubular body 10. Therefore, as described above, when the pump unit 3 is inserted into the fuel tank, the pump unit 3 can be suspended by the coupling member 4.

When the columnar body 20 is inserted into the tubular body 10, the protrusion 22 is held between the two ribs 11 on the side facing the slit 10a by the position where the engagement protrusion 12 can be engaged by the selection claw 21 (see fig. 3 and 5). By setting the interval between the two ribs 11 sandwiching the protrusion 22 to a size such that the protrusion 22 is just fitted, it is possible to suppress the shaking in the direction of the relative angle change (the circumferential direction of a virtual circle centered on the central axis of the cylindrical body 20) in the state where the cylindrical body 20 is inserted into the cylindrical body 10.

As shown in fig. 2, in a state where the columnar body 20 is inserted into the tubular body 10, the space in the cylinder of the columnar body 20 and the space in the cylinder of the tubular body 10 become one continuous space. In this space, the compression coil spring 31 is inserted in a state compressed in the insertion (up-down) direction of the column body 20. The coil spring 31 has an upper end portion in contact with the upper end top portion 10b of the tubular body 10 and a lower end portion in contact with the lower end bottom portion 20a of the tubular body 10. A pillar 32 having a letter Y (see fig. 3) in horizontal cross section is integrally formed at the central portion of the upper end top 10b of the tubular body 10 so as to extend downward. Accordingly, the coil spring 31 is supported by the stay 32 on the inner diameter side and held at the center of the tubular body 10. Since the outer diameter of the coil spring 31 is set to a size that fits into the inside of the columnar body 20, the coil spring 31 is held in the central portion of the columnar body 20. In this state, the pump unit 3 receives the reaction force of the coil spring 31 via the columnar body 20, and the pump unit 3 is pressed against the lid member 2 and held on the bottom plate 52 of the fuel tank.

< action and Effect of embodiment 1 >

According to embodiment 1, a claw 21 and a protrusion 22 are provided on the outer peripheral surface of the columnar body 20, and the protrusion 22 is sandwiched between two mutually adjacent ribs 11 of the plurality of ribs 11 protruding into the tubular body 10. Therefore, when the columnar body 20 is relatively rotated in a state of being inserted into the tubular body 10, the protrusion 22 engages with the rib 11 on the rotation direction side, and the relative rotation is suppressed. Thus, the occurrence of rattling with the relative rotation can be suppressed. Each rib 11 extends in the axial direction, and while the columnar body 20 slides in the insertion (up-down) direction in the tubular body 10, the protrusion 22 continues to be sandwiched between the adjacent ribs 11. Therefore, the above-described rattling can be suppressed regardless of the amount of insertion of the columnar body 20.

The claw 21 and the protrusion 22 are axisymmetric and have the same shape. Therefore, when the relative angle at the time of inserting the cylindrical body 20 into the cylindrical body 10 is changed by 180 degrees and the protrusion 22 functions as the claw 21, the original claw 21 is sandwiched between the two mutually adjacent ribs 11, and the same function as the original protrusion 22 can be achieved. Accordingly, the same fuel supply device 1 can be used by switching between a so-called coaxial type in which the positions of the cover member 2 and the pump unit 3 in the vertical direction are identical to each other as shown in fig. 8, and a so-called offset type in which the positions are not identical to each other as shown in fig. 7. In any state, the projection 22 or the claw 21 is engaged with the rib 11, so that rattling caused by the relative rotation between the cylindrical body 20 and the cylindrical body 10 in the inserted state can be suppressed.

< embodiment 2 >

Fig. 9 shows embodiment 2. Embodiment 2 is characterized in that the cylindrical body 110 and the columnar body 120 each have a quadrangular cylindrical shape, as compared with embodiment 1. Other structures are similar to those of embodiment 1 in embodiment 2, and the description of the same parts will be omitted.

In embodiment 2 as well, in the same manner as in embodiment 1, in a state in which the columnar body 120 is inserted into the tubular body 110, the protrusion 22 is sandwiched between two mutually adjacent ribs 11. Therefore, the shaking caused by the relative rotation of the cylindrical body 120 and the cylindrical body 110 in the inserted state can be suppressed. The same fuel supply device 1 can be used by changing the relative angle by 180 degrees when the cylindrical body 120 is inserted into the cylindrical body 110, and switching between the coaxial type and the offset type.

Embodiment 3

Fig. 10 shows embodiment 3. Embodiment 3 is characterized in that the cylindrical body 210 and the columnar body 220 are both cylindrical in shape, as compared with embodiment 1. Further, there are a plurality of, specifically three, protrusions 22. Other structures are similar to those of embodiment 1 in embodiment 3, and the description of the same parts will be omitted.

In embodiment 3, one claw 21 and three protrusions 22 are formed in the same shape, and are provided at 90-degree intervals on the outer periphery of the columnar body 220. The ribs 11 sandwiching the two protrusions 22 are set so that the protrusions 22 are exactly fitted into the spaces between the two ribs 11. Therefore, the effect of suppressing the rattling caused by the relative rotation of the cylindrical body 220 in the state of being inserted into the cylindrical body 210 can be further improved. The relative angle at which the columnar body 220 is inserted into the tubular body 210 can be changed at 90-degree intervals. Therefore, the same fuel supply device 1 can be used by switching between the coaxial type and the offset type, and the offset amount of the pump unit 3 with respect to the cover member 2 when the offset type is set can be switched to three stages.

< other embodiments >

The technology disclosed in the present specification has been described above for specific embodiments, but can be implemented in various other modes. For example, the above-described embodiment is a fuel supply device that supplies fuel to a gasoline engine of a vehicle, but the fuel supply device may supply fuel to various engines other than the vehicle, or to a diesel engine, not limited to a gasoline engine. In the above embodiment, the pump unit 3, the cover member 2, and the coupling member 4 are formed of resin as a whole, but may be formed of a material other than resin, such as a metal. In embodiment 1, the pawl 21 and the projection 22 are formed in the same shape and are axisymmetric to each other, but the pawl 21 and the projection 22 may be formed in positions offset from the axisymmetric positions in the insertion direction or around the insertion direction of the column 20 instead of being formed in the same shape.

Claims (5)

1. A fuel supply device is characterized in that,

the fuel supply device is provided with:

a lid member fixed to the top plate so as to close an opening penetrating the top plate of the fuel tank;

a pump unit that can be placed on a floor plate in a fuel tank and that includes a fuel pump that draws fuel in the fuel tank; and

a coupling member coupling the cover member and the pump unit to each other,

the connecting member is provided with:

a cylindrical body having an opening portion facing downward on a lower surface of the cover member; and

a columnar body having a lower end portion coupled to the pump unit and an upper end portion fitted into the tubular body from an opening portion of the tubular body,

the columnar body has a claw protruding from an outer peripheral surface of an upper end portion thereof toward an inner wall of the cylindrical body,

the cylindrical body is provided with an engaging protrusion which engages with the claw in a state where the cylindrical body is inserted into a position where a space capable of further inserting the cylindrical body remains in the cylindrical body, and prevents the cylindrical body from being separated from the state of being inserted into the cylindrical body,

the cylindrical body includes a plurality of ribs protruding toward an outer peripheral surface of the cylindrical body so as to surround the outer peripheral surface of the cylindrical body in a state of being inserted into the cylindrical body, extending along an insertion direction of the cylindrical body into the cylindrical body,

the columnar body includes a protrusion protruding from an outer peripheral surface of the columnar body toward an inner wall of the columnar body, and the protrusion is sandwiched between two adjacent ribs of the plurality of ribs.

2. The fuel supply apparatus according to claim 1, wherein,

the protrusion is provided in the same shape as the claw,

when the cylindrical body is inserted into the cylindrical body in a positional relationship in which the protruding portion is engaged with the engaging protrusion, the claw is arranged so as to be sandwiched between two adjacent ribs.

3. The fuel supply apparatus according to claim 2, wherein,

the cylindrical body has a quadrangular cylindrical shape inserted into an opening of the cylindrical body,

the claw and the protrusion are provided on opposite wall surfaces of the quadrangular cylindrical shape of the columnar body, respectively.

4. The fuel supply apparatus according to claim 2, wherein,

the protrusions are formed in a plurality of dispersed manner in the circumferential direction of the outer peripheral surface of the columnar body,

the protrusions are respectively sandwiched between two of the ribs adjacent to each other.

5. The fuel supply apparatus according to claim 4, wherein,

the claw and the plurality of protrusions are arranged at equal intervals in the circumferential direction of the outer peripheral surface of the columnar body.