JPS5970230A - Structure for supporting inner pump for fuel tank of vehicle - Google Patents

Abstract

PURPOSE:To lower the fuel suction port of an inner pump, by coupling the upper part of a fuel filter to the peripheral surface of the body of the inner pump through a vibration-proof member and supporting the lower surface of the filter by the bottom of a pump mounting bracket. CONSTITUTION:The top of a bracket 3 is secured on the inside of the upper plate 2 of a fuel tank 1. The upper part of an inner pump 4 is supported by the bracket 3 through an upper vibration-proof member 12. An annular lower vibration-proof member 17' is fitted on the peripheral surface of the lower part of the body 11 of the pump 4. The upper end of a fuel filter 14 is bonded on the lower end of the lower vibration-proof member 17'. The bottom of the filter 14 is supported on that 16 of the bracket 3. The thickness of the lower vibration- proof member 17' is large enough to certainly absorb the vibration of the pump 4. The fuel suction port 22 of the pump is so low that fuel which remains in the tank 1 and cannot be sucked is decreased.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a support structure for an inner pump built into a vehicle fuel tank, and more particularly to an improvement in the support structure for an inner pump attached to a fuel tank via a bracket.

In a conventional inner pump support structure of this kind, for example, as shown in FIG. It is known that it is installed like this. The bracket 3 is composed of an upper mount bracket 5 and a lower mount bracket 6 having a lower fuel intake lower part, and the connecting flange 8 of both is fixed with a bolt 10 screwed into a nut 9. Both brackets 5 and 6 are connected. The inner pump 4 has a ring-shaped upper vibration isolating member 12 mounted on the outer periphery of the upper end of the cylindrical body 11 and a lower mount bracket 6.
By making elastic contact with the inner peripheral surface of the bracket 3, the upper side
The cup-shaped fuel filter 14 is supported by the body 1.
A retaining protrusion 1 is placed over the lower outer wall of the body part 1 so that a gap is formed between the retaining protrusion 1 and the lower outer wall of the body part 11, and the upper end thereof is provided on the outer circumferential surface of the body part 11.
3 is engaged. Further, the lower side was supported by the bracket 3 by bringing its lower surface into contact with the upper surface K of the plate-shaped lower vibration isolating member 11 disposed on the bottom wall 16 of the lower mount bracket 6. As described above, the fuel filter 14 is composed of a strong frame 18 for supporting the lower side of the inner pump 4 and a predetermined mesh portion 19 provided in a part of this strong frame 18. Additionally, impurities such as dust contained in the fuel can be removed by the mesh portion 19. The inner pump 4 shown in this example is an electromagnetic type l), and a battery terminal 20 at the upper end of the body 11
, the pump is driven by a battery connected to 21;
The clean fuel that has passed through the fuel filter 14 is sucked in through a fuel suction port 22 provided at the lower end of the body 11 and forcibly supplied to the engine (not shown) through a fuel tube 23 connected to the upper end of the body 11. do.

The vibration isolating members 12, 17 are made of an elastic material such as rubber or soft plastic.

However, in such a conventional inner pump support structure, vibrations occurring in the inner pump 4 are absorbed by the body 11.
Both the upper vibration isolating member 12 disposed at the upper end and the lower vibration isolating member 1γ interposed between the fuel filter 14 supporting the lower part of the body 11 and the bottom wall 16 of the lower mount bracket 6. Since the structure is such that vibrations are absorbed by the vibrations and vibrations are prevented from being transmitted to the bracket 3 and the fuel tank 1, it is necessary to form the vibration isolating members 12 and 17 thickly in order to reliably prevent vibrations. However, in the case of the lower vibration isolating member 11, when its thickness is increased, the position of the fuel suction port 22 of the inner pump 4 must be raised accordingly, and as a result, the position of the fuel suction port 22 between the lower plate 24 of the fuel tank 1 and the fuel suction port 22 is increased. If the distance between the gaps is large, there is a problem in that a large amount of unsuctionable fuel remains in the fuel tank 1. Therefore, in the past, due to the request to reduce the amount of unsuckable fuel as much as possible,
The thickness of the lower vibration isolating member 11 could not be ensured sufficiently, and the lower vibration of the inner pump 4 could not be completely absorbed by the lower vibration isolating member 17. As a result, vibrations from the inner pump 4 are transmitted to the vehicle body via the bracket 3 and the fuel tank 1, which may cause vehicle body noise.

The present invention has been made in view of the above-mentioned conventional problems, and its purpose is to reduce the vibrations that occur in the inner pump without increasing the amount of fuel that cannot be sucked into the inner pump remaining in the fuel tank. The present invention provides a support structure for an inner pump that reliably shuts off and prevents power from being transmitted to a fuel tank. In order to achieve the above object, the present invention provides a vibration isolating member on the outer peripheral surface of the body of the inner pump, and connects the vibration isolating member to the upper part of the fuel filter.
The gist is that the lower surface of the fuel filter is brought into contact with the bottom wall of the bracket.

The present invention will be described in detail below based on the accompanying drawings.

FIG. 2 shows a first embodiment of the present invention, which is basically the same as the conventional example.
The upper end of a cylindrical bracket 3 is fixed to the upper surface of the inner wall of the pump, and an inner pump 4 is attached to the bracket 3 to form a support structure.

The bracket 3 is the upper mount bracket 5.
and a lower mount bracket 6 having a lower fuel intake lower part, and a joint 7 and a flange 8 between the two are connected by fixing bolts 10 and nuts 9. Further, a ring-shaped upper vibration isolating member 12 is attached to the outer periphery of the upper end of the cylindrical body 11 of the inch pump 4, and the upper vibration isolating member 12 is attached to the lower mount bracket 6. By making elastic contact with the inner circumferential surface, the upper side of the inner pump 4 is supported by the bracket 3, and due to its vibration-proofing effect, vibrations generated on the upper side of the inner pump 4 are absorbed by the bracket 6.
I try not to let it get across. The vibration isolating member 12 is made of an elastic material such as rubber or soft plastic.

On the other hand, the support structure on the lower side of the body part 11 is provided by fitting and attaching a ring-shaped lower vibration isolating member 11' to the outer peripheral surface of the lower side of the body part 11. The upper end of a conventional fuel filter 14 that covers the lower part of the portion 11 is fixed with adhesive, and the lower surface of the fuel filter 14 is brought into contact with the bottom wall 16 of the lower mount bracket 6. The lower vibration isolating member 11 is made of the same elastic material as the upper vibration isolating member 12 and has a slightly thinner ring, and its outer peripheral surface is separated from the inner peripheral surface of the lower mount bracket 6. Further, the upper end portion of the lower vibration isolating member 17' fixed to the outer circumferential surface of the body 1 is brought into contact with the stopper member 25 provided below the protrusion 13 of the body 11, and the lower vibration isolating member 17' This prevents displacement in the vertical direction. still,
In FIG. 2, reference numerals 20 and 21 are battery terminals, and 23 is a fuel tube.

Therefore, according to such an inner pump support structure,
Since the lower vibration isolating member 17' can be formed thicker than the conventional one, vibrations on the lower side generated in the inner pump 4 are gradually attenuated by the lower vibration isolating member 17', and the lower vibration isolating member 17' and the fuel At the connection site with the filter 14, it is completely absorbed. Therefore, the vibration of the inner pump 4 is not transmitted to the fuel filter 14, and vibration transmission to the bracket 3 can be completely blocked.

In addition, with this support structure, the conventional fuel filter 14
The lower vibration isolating member 11 between the lower surface of the lower mount bracket 6 and the bottom wall 16 of the lower mount bracket 6 can be eliminated, and the fuel suction port 22 of the inner pump 4 can be lowered by that amount. Therefore,
The distance hi between the lower plate 24 of the fuel tank 1 and the fuel suction port 22 can be reduced compared to the conventional case, and the amount of unsuctionable fuel remaining in the fuel tank 1 can be reduced.

FIG. 3 shows a second embodiment of the present invention, except that the mounting means for the lower vibration isolating member 17'' and the means for fixing the lower vibration isolating member 17'' and the fuel filter 14 are different.
The configuration is similar to that of the first embodiment. In this embodiment, there are two protrusions 13a on the outer periphery of the body 11 of the inner pump 4.
13b, and a lower vibration isolating member 1 formed in a ring shape from the same elastic material as above is provided on the protrusions 13a and 13b.
By engaging the lower vibration isolating member 1〃 and holding the outer periphery of the lower vibration isolating member 17'' with the tightening ring 26, the lower vibration isolating member 1 is attached to the body 11.
7", an engaging protrusion 27 for engaging the fuel filter 14 is integrally provided along the outer circumferential wall of the lower vibration isolating member 1r", and the engaging protrusion 27 is provided with a recess in the inner wall of the upper end of the fuel filter 14. By engaging the groove 28, the lower vibration isolating member 1γI
The IK fuel filter 14 is fixed.

Further, the lower surface of the fuel filter 14 is in contact with the bottom wall of the lower mount bracket 6.

Therefore, in this embodiment as well, as in the previous embodiment, it is possible to ensure a sufficient thickness of the lower vibration isolating member 17'', so that the lower vibration generated in the inner pump 4 is absorbed by the lower vibration isolating member 11''. ) can absorb fuel filter 14
In addition to preventing vibrations from being transmitted to the fuel tank 1, the distance h2 between the lower plate 24 of the fuel tank 1 and the fuel suction port 22 of the inner pump 4 can be reduced, and the fuel suction port 22 can be lowered. can. Furthermore, in this embodiment, the lower vibration isolating member 17'' can be securely fixed, and the fuel filter 14 can also be replaced easily.

In addition, the lower vibration isolating members 1γ', 11'' and the fuel filter 1
Of course, the mounting and fixing means of No. 4 is not limited to the above embodiment.

As explained above, according to the inner pump support structure for a vehicle fuel tank according to the present invention, it is possible to ensure a sufficient thickness of the vibration isolating member for isolating vibrations from the inner pump. The isolation performance is improved and the transmission of vibrations to the fuel tank, which causes vehicle body vibration, can be reliably prevented.

In addition, since the conventional vibration isolating member that was interposed between the bottom surface of the fuel filter and the bottom surface of the bracket could be removed, the fuel suction port of the inner pump could be lowered by that amount, and the inside of the fuel tank could be lowered. The amount of unsuctionable fuel remaining in the tank can be reduced.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view showing an example of a conventional inner pump support structure of a vehicle fuel tank, Fig. 2 is a cross-sectional view showing a second embodiment of the present invention, Figs. It is a sectional view showing an example. 1...Fuel tank 3...Bracket 4...
Inner pump 11...Body part 12...Vibration isolation member
14...Fuel filter 16...Bottom wall
17.1? ', 17''...Vibration isolation member patent applicant
Nissan Motor Co., Ltd. Representative Patent Attorney Kaoru Dobashi Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] In the inch pump support structure for a vehicle fuel tank, one end of the bracket is fixed to the inner wall of the fuel tank, and the inner pump is supported by the bracket via the vibration isolating member and the fuel filter. A vibration isolating member is provided on the surface, this vibration isolating member is joined to the upper part of the fuel filter that is placed on the lower part of the body, and the lower surface of the fuel filter is still supported in contact with the bottom wall of the bracket. Features: Inner pump support structure for vehicle fuel tanks.