JP2000234574A - Fuel feeding device for internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the generation of actual vehicle noise by a method wherein vibration of a tank is suppressed through prevention of transmission of vibration generated at a fuel pump to a fuel tank. SOLUTION: This device comprises a fuel pump 2; and a containing case 1 containing a fuel pump 2 and arranged in a fuel tank 6. A vibration control material 50 is arranged on the side wall of the containing case 1. By the vibration control material 50 arranged on the side wall of the containing case 1, vibration generated by the fuel pump 2 is prevented from transmission to the fuel tank 6 to suppress vibration of the tank.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel supply device for an internal combustion engine mounted on a vehicle.

[0002]

2. Description of the Related Art A conventional fuel supply device for an internal combustion engine (also simply referred to as a fuel supply device) includes a fuel pump, a fuel pump provided to surround the fuel pump, the fuel pump and the fuel pump. There is one that includes a housing case that houses and is disposed in a fuel tank (for example, see Japanese Patent Application Laid-Open No. 9-32672 proposed by the same applicant).

[0003]

In the above-described fuel supply device for an internal combustion engine, when mounted on a vehicle, the vibration generated by the fuel pump is transmitted through the fuel filter, the housing case, the fuel in the tank, and the fuel tank. As a result, vibration (also referred to as tank vibration) is generated in the fuel tank 6, and vehicle noise (also referred to as actual vehicle noise) is generated.
As a driver and passengers. Actual vehicle noise as a required performance of the fuel supply device is often a problem in vehicle manufacturers. In addition, there is a correlation between the tank vibration and the actual vehicle noise, and it is known that the actual vehicle noise can be reduced by preventing the tank vibration.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to prevent a vibration generated in a fuel pump from being transmitted to a fuel tank. An object of the present invention is to provide a fuel supply device for an internal combustion engine that can reduce actual vehicle noise by suppressing vibration.

[0005]

According to a first aspect of the present invention, there is provided a fuel supply apparatus for an internal combustion engine, comprising: a fuel pump; and a housing case for housing the fuel pump and disposed in a fuel tank. A fuel supply device for an internal combustion engine, wherein a vibration isolator is provided on a side wall of the storage case. With this configuration, the vibration-proof material provided on the side wall of the storage case allows
By preventing the vibration generated by the fuel pump from being transmitted to the fuel tank and suppressing the tank vibration, it is possible to reduce actual vehicle noise.

According to a second aspect of the present invention, there is provided the fuel supply device for an internal combustion engine according to the first aspect, wherein the vibration isolator is disposed in a portion of the housing case which covers a portion of the fuel pump where vibration is large. With such a configuration, the vibration of the tank can be effectively reduced by arranging the vibration isolator in the portion of the storage case that covers the portion of the fuel pump where the vibration is large.

According to a third aspect of the present invention, the vibration damping material is 0.12 to 0.12.
3. The fuel supply device for an internal combustion engine according to claim 1, wherein the fuel supply device is formed of an elastic material having a specific gravity of 0.4. With this configuration, the elastic material having a specific gravity of 0.12 to 0.4 has a high tank vibration reducing effect.
An even higher effect of reducing actual vehicle noise can be obtained.

According to a fourth aspect of the present invention, the vibration-proof material is formed of a paper material subjected to a fuel-resistant treatment.
The fuel supply device for an internal combustion engine according to any one of claims 1 to 3. With this configuration, the paper material subjected to the fuel-resistant treatment is inexpensive as compared with an elastic material such as foamed rubber, which is useful for reducing the cost of the vibration damping material. In addition, the `` paper material which has been subjected to fuel resistance treatment '' as used in the present specification means that the base material is impregnated with a resin such as a phenol resin or an alkyl resin, similarly to a generally used filter paper for a fuel filter. It is a paper material that has been processed to cure the resin by heat treatment.

According to a fifth aspect of the present invention, there is provided the fuel supply device for an internal combustion engine according to the fourth aspect, wherein the paper material subjected to the fuel-resistant treatment is made of a filter paper for a fuel filter. With this configuration, the filter paper for a fuel filter is more widely used than before, and has a record of fuel resistance, which is useful for improving the durability of the vibration damping material. For example, when the vibration damping material is an elastic material, it expands and contracts in a poor fuel, so that it tends to change with time. Since there is little change over time, the durability of the vibration damping material is excellent.

According to a sixth aspect of the present invention, there is provided the fuel supply device for an internal combustion engine according to the fourth or fifth aspect, wherein a plurality of paper sheets are stacked. With this configuration,
Even if the sheets have a small thickness, a plurality of sheets can be laminated to obtain a vibration damping material having a predetermined thickness, and the greater the number of laminated sheets, the more the effect of reducing tank vibration can be improved.

According to a seventh aspect of the present invention, a holding member for holding the vibration isolator is provided, and the holding member is attached to the housing case via snap-fit means which engages using elastic deformation. A fuel supply device for an internal combustion engine according to any one of claims 1 to 6. With this configuration, the holding member can be easily attached to the housing case by the snap-fit means, so that the vibration isolator can be easily attached to the housing case.

[0012]

[First Embodiment] A first embodiment of the present invention will be described with reference to the drawings. In FIG. 1 showing a side sectional view of the fuel supply device for the internal combustion engine, the fuel supply device for the internal combustion engine is modularized by housing a fuel pump 2, a fuel filter 3, a pressure regulator 4, and the like in a housing case 1. The fuel tank 6 is mounted on the fuel tank 6 (the mounting portion is shown in the drawing) in units of one module. The storage case 1 includes a case main body 1a and a bracket 5, which will be described later.

The case main body 1a is made of a synthetic resin and has a substantially cylindrical shape with a bottom. The bracket 5 that covers the upper opening of the case main body 1a is made of synthetic resin and has a substantially bottomed cylindrical shape with a lower opening. The bracket 5 has a flange 5b projecting from the upper outer peripheral surface. The bracket 5 is arranged so as to close the opening 6 a on the upper surface of the fuel tank 6, and the flange 5 b is placed via the packing 16. The flange 5b is provided with a holding frame plate 7 which is fastened to the fuel tank 6 by bolts (not shown).
Thus, the fuel tank 6 is fixed on the fuel tank 6. A retainer 12 is interposed between the fuel tank 6 and the presser frame plate 7 to keep the compression ratio of the packing 16 within a specified range.

On the lower surface of the bracket 5, there is integrally formed a fitting cylindrical portion 5a which fits into the upper edge of the case main body 1a. Fitting cylindrical portion 5a of bracket 5 and case body 1
On the fitting surface with the upper edge portion a, a plurality of sets of engaging means formed by engaging projections 9 and engaging holes 10 which can be engaged with each other are arranged on the circumference. In the case of this example, the engagement protrusion 9 is formed on the fitting cylinder portion 5a of the bracket 5, and the engagement hole 10 is formed on the upper edge of the case main body 1a. The case main body 1a
When attaching the bracket 5 to the bracket 5, the fitting cylinder 5a of the bracket 5 is fitted into the upper edge of the case main body 1a. Then, the engagement protrusion 9 is engaged with the engagement hole 10 by utilizing the elastic deformation of the upper edge portion of the case main body 1a.
The bracket 5 is attached to the case main body 1a.

A fuel pump 2 is housed vertically in the center of the case body 1a. The fuel pump 2 is elastically supported by a mounting stay 34 mounted on the case main body 1a via a cushion rubber 33. The fuel pump 2 draws in the fuel in the fuel tank 6 from a pump inlet filter 31 at the bottom and pressurizes the fuel in the fuel tank 6 to increase the fuel discharge port 32 at the upper end.
Discharge from.

The fuel discharge port 32 of the fuel pump 2 is connected to a fuel inlet 3a of a substantially cylindrical fuel filter 3 via a cylindrical cushion rubber 36. The fuel filter 3 contains a filter element 37 in a filter case (symbols omitted) also serving as the case main body 1a. The fuel filtered by passing through the filter element 37 from the outer side to the inner side flows out from the fuel outlet 3b.

A pressure regulator 4 is provided on an upper surface of the fuel filter 3. The pressure regulator 4 controls the pressure of the fuel discharged from the fuel filter 3, that is, the supply pressure of the fuel to the internal combustion engine, to a predetermined pressure.

Next, the bracket 5 will be described. The bracket 5 is integrally formed with a fuel outlet pipe 11, a valve housing 14 for a fuel cutoff valve 13, a connector (not shown) for the fuel pump 2, and the like.

The fuel outlet pipe 11 forms a pipe penetrating the bracket 5 in the vertical direction. Fuel outlet pipe 11
Is connected to the fuel outlet 3b of the fuel filter 3 in a sealed state. An elbow connection pipe 28 is connected to the upper end of the fuel outlet pipe 11 in a sealed state. An elbow type connection pipe 28 has a delivery pipe (not shown) for a fuel injector in an internal combustion engine.
The fuel supply line 15 is connected to the fuel supply line 15.

The bracket 5 is provided with a fuel cutoff valve 13. The valve housing 14 of the fuel cutoff valve 13 is formed in a substantially cylindrical shape having an open lower surface. A connection pipe 14a extending in the radial direction (the left-right direction in FIG. 1) is formed integrally with an upper wall that closes the upper surface of the valve housing 14. One end face (the left end face in FIG. 1) of the connection pipe 14a is closed by a wall part which is substantially continuous with a side wall part of the valve housing 14. A connection hose 18 that communicates with the canister 17 is connected to the distal end of the connection pipe 14a.

The upper wall of the valve housing 14 has a substantially cylindrical seat portion 46 communicating the internal space of the valve housing 14 with the conduit of the connecting pipe 14a, and a substantially adjacent seat portion 46 adjacent to the seat portion 46. A cylindrical mounting tube 47 is integrally formed. The seat part 46
On the lower end surface of is formed a tapered hole-shaped valve seat (symbol omitted) which is opened and closed by a float valve 25 described later. The mounting cylinder 47 is formed in a substantially cylindrical shape that shares the side wall of the valve housing 14.

The relief valve 21 is incorporated in the mounting cylinder 47. The relief valve 21 opens when the pressure rise on a float valve 25 described later in the valve housing 14 becomes large, or when the pressure in the fuel tank 6 rises more than a specified value, and releases the pressure to the connection pipe 14a. Escape to

In the valve housing 14, a float valve 25 for opening and closing the seat portion 46 is incorporated. The float valve 25 is normally in the seat portion 4
By opening the fuel tank 6, the evaporative gas in the fuel tank 6 is discharged to the canister 17 through the seat portion 46, the connection pipe 14a, and the connection hose 18, and is closed by closing the seat portion 46 when the vehicle is tilted or overturned. Prevent outflow to 17. The fuel cutoff valve 13 is constituted mainly by the float valve 25.

The side walls of the case main body 1a of the housing case 1 have elastic members 5 as described in detail below.
0 is held by the holding member 52. In addition, a sender gauge attachment portion 1b to which a sender gauge (not shown) is attached is formed on the right outer surface of the case main body 1a.

FIG. 2 is a front view of the fuel supply device, FIG. 3 is a front view of the case main body 1a, and FIG. 4 is a right side view thereof. 2 to 4, front and rear engaging projections 60 are integrally formed on the front outer right surface on the front side and the rear substantially outer center surface at the upper end of the case main body 1a. Each of the engaging projections 60 protrudes in a substantially rectangular plate shape that is long in the vertical direction, and has enlarged portions 60a having a substantially arc-shaped cross section at upper and lower portions on both side surfaces thereof.

FIG. 5 is a plan view of the holding member 52, FIG. 6 is a right side view thereof, FIG. 7 is a bottom view thereof, and FIG.
A sectional view taken along line II is shown. 5 to 8, the holding member 52 is made of a synthetic resin and is formed in a substantially rectangular plate shape that is curved in a substantially arc shape. At both ends of the holding member 52, engagement grooves 54 are formed which are cut downward from the upper end surface. The engagement groove 54 has a substantially semicircular concave portion 54a formed in both groove walls at the center of the vertical groove extending in the vertical direction, and has a tapered guide slope 54b which extends upward at the upper end portions of both groove walls. Are formed. Holding member 5
On the inner surface of 2, an attachment recess 56 into which the elastic member 50 (see FIG. 1) is fitted is formed. Mounting recess 5
6 has a bottom surface 56a and both side surfaces 56b.

The case body 1a and the bracket 5
Examples of the resin material of the holding member 52 include a polyoxymethylene resin, a polyphenylene sulfide resin, and a polyamide resin. In addition, as a resin molding method of the case main body 1a, the bracket 5, and the holding member 52, for example, an injection molding method can be mentioned.

As shown in FIG. 1, the elastic member 50 is made of a substantially rectangular foam rubber which is attached to the attachment concave portion 56 of the holding member 52. The elastic member 50 is made of foam rubber having a specific gravity of 0.12 to 0.4. Note that the elastic body corresponds to the vibration-proof material in the present invention.

Subsequently, the elastic member 50 is attached to the case main body 1a.
The procedure for attaching the device will be described. First, the holding member 52
The elastic member 50 is attached to the attachment concave portion 56 of FIG. At this time, the elastic member 50 may be adhered to the mounting concave portion 56 of the holding member 52, may be fitted by utilizing its elasticity, or may be simply overlapped.

Next, the holding member 52 to which the elastic member 50 is attached is positioned so as to follow the lower portion of the case body 1a, and the engaging projection 60 and the engaging groove 54 are vertically opposed to each other. Then, the holding member 52 is moved relatively upward with respect to the case main body 1a.

Then, the engaging projection 60 engages with the engaging groove 54 by utilizing the elastic deformation of the groove wall. At this time, the enlarged portion 60a of the engagement convex portion 60 is
b, and intervenes while elastically deforming the groove wall of the engaging groove 54. The engagement is completed when the lower end of the engagement protrusion 60 contacts or approaches the groove bottom of the engagement groove 54, and the enlarged portion 60 a at the top of the engagement protrusion 60 is engaged with the engagement groove 5.
4, and the lower enlarged portion 60 a is located between the groove walls of the engagement groove 54. The engagement protrusion 60 and the engagement groove 54 constitute a snap-fit unit according to the present invention.

The elastic member 50 is provided on the case main body 1a by attaching the holding member 52 to the case main body 1a as described above (see FIGS. 1 and 2). If the holding member 52 is moved relatively downward with respect to the case main body 1a, the engagement protrusion 60 can be removed by utilizing the elastic deformation of the groove wall of the engagement groove 54.

In the above-described fuel supply device for an internal combustion engine, when the fuel pump 2 is operated in accordance with the operation of the engine, the fuel in the fuel tank 6 is sucked through the pump inlet filter 31 and is pressurized. The fuel discharged from the fuel discharge port 32 of the fuel pump 2 is supplied to the filter element 3 of the fuel filter 3.
7, the fuel supply line 15 through the fuel outlet 3b, the fuel outlet pipe 11 of the bracket 5, and the elbow-type connecting pipe 28.
Sent to The pressure of the supplied fuel is adjusted by the pressure regulator 4 so as to be always constant. The flow of the fuel is shown by arrows in FIG.

The fuel cut-off valve 13 incorporating the relief valve 21 is, as described above,
Normally, the float valve 25 opens the seat portion 46 so that the evaporative gas in the fuel tank 6 is removed from the canister 1.
7, the float valve 25 closes the seat portion 46 when the vehicle leans or falls, thereby preventing the liquid fuel from flowing out to the canister 17.

As described above, the relief valve 21 is opened when the fuel level in the fuel tank 6 rises and the pressure on the float valve 25 in the valve housing 14 increases. Valve and apply said pressure to connecting pipe 1
The escape to 4a prevents the pressure from becoming excessive and prevents the float valve 25 from being damaged. When the pressure in the fuel tank 6 rises more than a specified value while the float valve 25 is closed, the valve is opened to protect the fuel tank 6 and lowers the pressure.

According to the fuel supply device for an internal combustion engine, the elastic material 50 is provided on the side wall of the housing case 1. With this configuration, the elastic member 50 provided on the side wall of the storage case 1 prevents the vibration generated by the fuel pump 2 from being transmitted to the fuel tank 6 and suppresses the tank vibration.
Actual vehicle noise can be reduced.

Incidentally, the applicant of the present application has described how the tank vibration caused by the transmission of the vibration generated in the fuel pump 2 changes based on the amount of fuel in the fuel tank 6 (the remaining amount is also referred to as the amount of fuel in the tank). Was measured. The measurement was performed without the elastic member 50 and the holding member 52.

FIG. 9 shows the measurement results. The horizontal axis represents frequency (Hz), and the vertical axis represents tank vibration (G). When the fuel line in the tank is 5L, the characteristic line a2 is 10L in the tank, the characteristic line a3 is 30L in the tank, and the characteristic line a4 is the fuel amount in the tank. The measurement result at the time of 40 L (full tank) is shown.

As apparent from FIG. 9, it was found that the tank vibration was the largest when the fuel amount in the tank was full (see the characteristic line a4). The reason may be that the vibration of the storage case 1 is easily transmitted to the fuel tank 6 through the fuel in the tank that is full.

Next, the storage case 1 in the fuel supply device
Was measured for vibration distribution. The measurement was performed at positions A, B, C, D, and E as shown in a schematic front view in FIG. 10 without the elastic member 50 and the holding member 52 in the fuel supply device.

FIG. 11 shows the measurement results. The horizontal axis is the measurement position, and the vertical axis is the tank vibration (G). FIG.
As is clear from the characteristic line (1), the vibration at the measurement position B near the upper end of the fuel pump 2 was the largest. From this result, it was found that the elastic material 50
, The tank vibration can be greatly reduced.

Next, it was measured how the tank vibration changes depending on the mounting position, that is, the arrangement of the elastic member 50. The measurement was carried out with the amount of fuel in the tank most easily transmitted to the tank vibration, that is, in the full state.

FIG. 12 shows the measurement results. The horizontal axis represents frequency (Hz), and the vertical axis represents tank vibration (G).
When the characteristic line b1 does not include the elastic member 50, the characteristic line b2 indicates that the elastic member 50 is attached only to the measurement position B (see FIG. 10), and the characteristic line b3 indicates the measurement position B and the measurement position C. When the elastic member 50 is attached to the measuring position D, the characteristic line b4 indicates the measurement result when the elastic member 50 is attached to the measuring position A, the measuring position B, the measuring position C, the measuring position D, and the measuring position E. Is represented. The elastic material 50 has a specific gravity of 0.2.
Was used.

As is apparent from FIG. 12, when the elastic member 50 is attached to the measurement position B from the characteristic line b2, the vibration reduction effect is large, and the elastic member 50 is attached to other positions from the characteristic line b3 and the characteristic line b4. However, it was found that the vibration reduction effect was not so much obtained.

According to the first embodiment, the vibration of the tank is effectively reduced by disposing the elastic member 50 at the portion of the housing case 1 that covers the portion of the fuel pump 2 where the vibration is large, that is, at the measurement position B. be able to.

According to the first embodiment, 0.1%
Since the elastic member 50 having a specific gravity of 2 to 0.4 has a high effect of reducing tank vibration, a higher effect of reducing actual vehicle noise can be obtained. The reason will be described. Based on the specific gravity of the elastic member 50, the effect of reducing the tank vibration was measured. In the measurement, a large number of elastic bodies having different specific gravities were prepared in a state where the elastic member 50 was attached to the measurement position B where the vibration of the storage case 1 was the largest, and the tank vibration of each elastic body was measured.

FIG. 13 shows the measurement results. The horizontal axis represents the specific gravity of the elastic member 50, and the vertical axis represents the tank vibration (G). As is clear from FIG. 13, it was found that the tank vibration was the smallest when the specific gravity of the elastic member 50 was in the range of 0.12 to 0.4. From this result, when the elastic member 50 having a specific gravity of 0.12 to 0.4 is used, tank vibration can be significantly reduced.

Further, according to the first embodiment, the holding member 52 can be easily attached to the housing case 1 by the snap-fit means including the engaging projections 60 and the engaging grooves 54. The elastic member 50 can be easily attached.

[Second Embodiment] A second embodiment will be described with reference to FIGS. In the second embodiment, a part of the first embodiment, that is, the mounting structure of the holding member 52 is changed, so that the mounting structure of the holding member (reference numeral 72 is added) will be described in detail. The same reference numerals are given and duplicate descriptions are omitted. As shown in a front view of the fuel supply device in FIG. 14, an elastic member 50 (FIG.
) Is held by the holding member 72.

FIG. 17 is a plan view of the holding member 52, FIG. 18 is a right side view thereof, FIG. 19 is a bottom view thereof, and FIG.
A sectional view taken along the line XX is shown. 17 to 20, the holding member 72 is made of a synthetic resin and is formed in a substantially rectangular plate shape that is curved in a substantially arc shape as in the first embodiment. The groove 54 is not formed. A mounting recess 76 similar to the mounting recess 56 (see FIG. 8) in the first embodiment for fitting the elastic member 50 (see FIG. 1) is formed on the inner surface of the holding member 52.

To attach the holding member 72, the case main body 1a is configured as follows. FIG. 15 is a front view of the case main body 1a, and FIG. 16 is a right side view of the same. 15 and 16, the case main body 1a
A pair of upper and lower engaging pieces 80 are integrally formed on a front right outer side surface, a front left outer side surface, and a left central outer side surface at an upper end portion of the front end. Each upper engagement piece 80 has a claw portion 80a protruding downward at the distal end. Each lower engaging piece 80 has a claw 80b projecting upward at the tip. Note that the same elastic member 50 as that of the first embodiment is used.

Subsequently, the elastic member 50 is attached to the case main body 1a.
The procedure for attaching the device will be described. First, the holding member 72
In the mounting recess 76 of the elastic member 5 as in the first embodiment,
0 is attached. Next, the holding member 72 to which the elastic member 50 is attached is closely contacted with the upper portion of the case main body 1a. Then, the claw portion 80a of the upper engagement piece 80 and the claw portion 80b of the lower engagement piece 80 engage the upper and lower edges of the holding member 72 by utilizing the elastic deformation of the engagement piece 80 (FIG. 14). The pair of upper and lower engaging pieces 80 and the upper and lower edges of the holding member 72 constitute a snap-fit means in the present invention.

The elastic member 50 is provided on the case main body 1a by attaching the holding member 72 to the case main body 1a as described above (see FIG. 14). In addition,
If the holding member 72 is separated from the case body 1a, the holding member 72 can be removed from the engaging piece 80 by utilizing the elastic deformation of the engaging piece 80.

According to the above-described fuel supply device, the same operation and effect as those of the first embodiment can be obtained.

[Third Embodiment] A third embodiment will be described with reference to FIGS. Embodiment 3
Is a part of the first embodiment, that is, the mounting structure of the holding member 52 is changed. Therefore, the mounting structure of the holding member 52 will be described in detail, and the same portions will be denoted by the same reference numerals and redundant description will be omitted. I do.

FIG. 21 is a side sectional view of the fuel supply device, and FIG.
As shown in the front view, the holding member 5 of the first embodiment is provided on the upper outer peripheral surface of the case main body 1a in the storage case 1.
A holding portion 90 having a substantially semicircular cross section is integrally formed at a portion corresponding to No. 2. The holding part 90 and the case main body 1a
21, a holding groove 91 having an open bottom surface as shown in FIG. 21 is formed. At the lower edge of the holding portion 90, a projection 92 for narrowing the opening width is formed continuously or intermittently in the circumferential direction.

The elastic member 50 is inserted into the holding groove 91 from the lower opening by utilizing its elastic deformation.
The elastic member 50 is held by the case main body 1a. In addition,
The elastic member 50 is prevented from coming off by the protrusion 92 of the holding portion 90. The same elastic material 50 as that of the first embodiment was used.

According to the above-described fuel supply device, substantially the same operation and effect as those of the first or second embodiment can be obtained. Note that the holding groove 91 may be formed in an open top surface instead of the open bottom surface described above, and the elastic material 50 may be held in the open top holding groove. In this case, the holding groove 91
It is preferable to adopt a configuration in which the open upper surface is closed by the bracket 5.

Fourth Embodiment A fourth embodiment will be described with reference to FIGS. In the fourth embodiment, instead of the elastic member 50 in the first to third embodiments, a vibration-proof material is formed by a paper material (marked with reference numeral 150) which has been subjected to a fuel-resistant treatment. Therefore, the structure in which the vibration isolator 150 in the fourth embodiment is provided in the housing case 1 can be applied to the first embodiment, the second embodiment, or the third embodiment, and a duplicate description will be omitted.

In FIG. 23 which is a perspective view of a paper material (also simply referred to as a paper material) 150 which has been subjected to a fuel-resistant treatment, the paper material 150 may be subjected to a fuel-resistant treatment.
Here, a filter paper 151 for a fuel filter is used as the paper. Filter paper 151 for fuel filter
Is made by impregnating a base material with a resin such as a phenol resin or an alkyl resin, and then performing a heat treatment to cure the resin. Further, a plurality of the filter papers 151 are stacked. For example, if the thickness of one filter paper 151 is, for example, 0.3 mm, the filter paper 151 has 12 to
Approximately 18 sheets are stacked to form a paper material 150 having a thickness t.

Further, how the tank vibration changes depending on the thickness t of the paper material 150 was measured. The measurement is performed in the same manner as in the case of measuring the tank vibration based on the specific gravity of the elastic material in the first embodiment, with the paper material 150 attached to the measurement position B (see FIG. 10) where the vibration of the storage case 1 is the largest (see FIG. 10). The same as in the first embodiment.)
By changing the number of sheets 1 to be superposed, many paper materials 150 having different thicknesses t were prepared, and the tank vibration of each paper material 150 was measured.

FIG. 24 shows the measurement results. The horizontal axis represents the thickness t of the paper material 150 on which the filter paper 151 is overlapped, and the vertical axis represents the tank vibration (G). As is clear from FIG. 24, it was found that the smaller the thickness t of the paper material 150 was, the smaller the vibration reduction effect was, and the larger the thickness t was, the larger the vibration reduction effect was. Therefore, it can be said that the greater the number of sheets of the filter paper 151 to be superimposed, the greater the effect of reducing the tank vibration.

As a method of superposing the filter papers 151, for example, the following superposition examples 1 to 3 can be considered. In a superposition example 1, as shown in a perspective view in FIG. 25, filter papers 151 cut to a fixed size are superposed in a layered manner. In addition, as shown in a perspective view in FIG. 26, a superposition example 2 is a method in which filter papers 151 formed in a long strip shape elongated in the longitudinal direction of a paper material 150 are alternately folded many times so as to be superposed in a laminating manner. It is. Further, in the superposition example 3, as shown in the perspective view of FIG.
50 filter paper 15 formed in a long belt shape to be elongated in the short direction
1 are alternately bent many times so as to be superposed in a laminating manner.

The filter papers 151 superposed as described above are made into one paper material 150 in consideration of parts management and assemblability. That is, as a method of joining the superposed filter papers 151 as one sheet of paper material 150, for example, the following joining examples 1 to 3 can be considered. In bonding example 1, as shown in a perspective view in FIG. 28, the edge portions of the overlapped filter papers 151 are bonded by an adhesive 160. In addition, in the joining example 2, as shown in a perspective view in FIG. 29, the edges of the overlapped filter papers 151 are joined by clips 161. In addition, in connection example 3, as shown in a perspective view in FIG. 30, the edges of the superposed filter papers 151 are joined using a binding device, so-called stapler.
Shows a binding fitting 162.

By providing the paper material 150 on the side wall of the storage case 1 (see FIG. 1) of the fuel supply device according to the first embodiment, substantially the same operation and effect as in the first embodiment can be obtained. Further, the paper material 150 that has been subjected to the fuel-resistant treatment is inexpensive compared to an elastic material such as foamed rubber, and thus is useful for reducing the cost of the vibration damping material.

Also, filter paper 15 for fuel filter is used.
No. 1 is more widely used than before and has a record of fuel resistance, and is therefore useful for improving the durability of the vibration damping material. For example, when the vibration-proof material is an elastic material such as foamed rubber, the material expands and contracts in a poor fuel, so that the filter paper 151 for a fuel filter is more likely to change over time. Since there is a history of fuel resistance, there is little change with time, so that the vibration-proof material has excellent durability.

Further, even if the filter paper 151 has a small thickness,
By stacking a plurality of sheets, a paper material 150 having a predetermined thickness t can be obtained, and the effect of reducing tank vibration can be improved as the number of sheets stacked increases.

The present invention is not limited to the above embodiment, but can be modified without departing from the scope of the present invention. For example, the fuel supply device includes the storage case 1
What is necessary is just what contained the fuel pump 2 inside,
The presence or absence of the fuel filter 3, the pressure regulator 4, the fuel cutoff valve 13, and the like is not limited, and other components may be provided. Further, the shapes and materials of the case main body 1a and the bracket 5 in the storage case 1 are not limited to those of the above-described embodiment. Further, the vibration damping material is the same as that of the first embodiment.
Elastic material 50 in the embodiment, and paper material 150 in the fourth embodiment.
However, the present invention is not limited to this, and may be any as long as an anti-vibration effect is recognized.

Further, as the elastic material 50, rubber having no pores may be used in addition to foamed rubber. Also, the elastic material 50
Alternatively, the paper material 150 is attached to the holding member 5 by the case main body 1a.
It is also possible to attach them by bonding without using the holding parts 2 and 72 and the holding part 90. Further, the elastic material 50 or the paper material 150 may cover the housing case 1 not only partially but also substantially entirely, or may be arranged in a distributed manner, and the shape, arrangement, and the like are not limited. Also, the elastic material 50 or the paper material 15
0 may be provided on the inner peripheral surface of the case main body 1a (the surface facing the fuel pump 2). Also, the elastic material 5
It is also conceivable that the 0 or the paper material 150 is provided on the outer peripheral surface and / or the inner side surface of the side wall (fitting tubular portion 5a) of the bracket 5 instead of the case main body 1a. Also, the elastic material 5
The paper material 150 may be embedded in the side wall of the case main body 1a and / or the side wall of the bracket 5 (fitting cylindrical portion 5a). It is effective that the elastic material 50 or the paper material 150 is disposed at a position where the vibration of the storage case 1 is largest, and the elastic material 50 or the paper material 150 is appropriately determined depending on the configuration and arrangement of the storage components such as the fuel pump 2 in the storage case 1. It will be selected.

It is also conceivable that the snap-fit means is provided on a portion other than the side wall of the case main body 1a, for example, on the bracket 5. In addition, the arrangement relationship between the engagement protrusion 60 and the engagement groove 54 in the first embodiment is reversed, that is, the engagement protrusion 60 is provided on the holding member 52 and the engagement groove 5 is provided.
4 may be provided on the case main body 1a. The snap-fit means may be any means that engages with the housing case 1 using elastic deformation, and the shape, number, and the like are not limited.

[0071]

According to the fuel supply system for an internal combustion engine of the present invention, the vibration generated by the fuel pump is prevented from being transmitted to the fuel tank by the vibration isolator provided on the side wall of the storage case, thereby reducing the tank vibration. By suppressing the noise, actual vehicle noise can be reduced.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a fuel supply device according to a first embodiment.

FIG. 2 is a front view of the fuel supply device.

FIG. 3 is a front view of a case main body.

FIG. 4 is a right side view of a case main body.

FIG. 5 is a plan view of a holding member.

FIG. 6 is a right side view of the holding member.

FIG. 7 is a bottom view of the holding member.

FIG. 8 is a sectional view taken along line VIII-VIII in FIG. 5;

FIG. 9 is a characteristic diagram showing measurement results of tank vibration based on the amount of fuel in the tank.

FIG. 10 is a schematic front view showing a measurement position of tank vibration.

FIG. 11 is a characteristic diagram showing a vibration distribution of the storage case.

FIG. 12 is a characteristic diagram showing measurement results of tank vibration when the arrangement of the elastic material is changed.

FIG. 13 is a characteristic diagram showing measurement results of tank vibration based on the specific gravity of an elastic material.

FIG. 14 is a front view of a fuel supply device according to a second embodiment.

FIG. 15 is a front view of a case main body.

FIG. 16 is a right side view of the case main body.

FIG. 17 is a plan view of a holding member.

FIG. 18 is a right side view of the holding member.

FIG. 19 is a bottom view of the holding member.

20 is a sectional view taken along line XX-XX in FIG.

FIG. 21 is a side sectional view of a fuel supply device according to a third embodiment.

FIG. 22 is a front view of the fuel supply device.

FIG. 23 is a perspective view of a paper material according to the fourth embodiment.

FIG. 24 is a characteristic diagram showing measurement results of tank vibration based on the thickness of the filter paper.

FIG. 25 is a perspective view showing a first example of overlapping filter paper.

FIG. 26 is a perspective view showing a second example of superposition of filter papers.

FIG. 27 is a perspective view illustrating a third example of superposition of filter papers.

FIG. 28 is a perspective view showing a first example of joining filter paper.

FIG. 29 is a perspective view showing a second example of joining filter paper.

FIG. 30 is a perspective view showing a third example of joining filter paper.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Storage case 2 Fuel pump 6 Fuel tank 50 Elastic material (vibration-proof material) 51 Paper material (anti-vibration material) subjected to fuel-resistant treatment 52 Holding member

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Takashi Nagai 1-1 1-1 Kyowa-cho, Obu-shi, Aichi F-term in Ai San Industry Co., Ltd. 3D038 CA01 CB01 CC06

Claims (7)

[Claims] 1. A fuel supply device for an internal combustion engine, comprising: a fuel pump; and a storage case that stores the fuel pump and is disposed in a fuel tank, wherein a vibration isolator is provided on a side wall of the storage case. A fuel supply device for an internal combustion engine. 2. The fuel supply device for an internal combustion engine according to claim 1, wherein the vibration isolator is disposed in a portion of the storage case that covers a portion of the fuel pump where vibration is large. 3. The vibration damping material is made of an elastic material having a specific gravity of 0.12 to 0.4.
A fuel supply device for an internal combustion engine according to the above. 4. The fuel supply device for an internal combustion engine according to claim 1, wherein the vibration-proof material is formed of a paper material subjected to a fuel-resistant treatment. 5. The fuel supply device for an internal combustion engine according to claim 4, wherein the paper material subjected to the fuel-resistant treatment is made of a filter paper for a fuel filter. 6. The fuel supply device for an internal combustion engine according to claim 4, wherein a plurality of paper materials are stacked. 7. A holding member for holding a vibration isolator, wherein the holding member is attached to the storage case via snap-fit means which engages by utilizing elastic deformation. The fuel supply device for an internal combustion engine according to any one of the above.