JPH0137177Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a mounting device for a fuel pump in a fuel supply system of an automobile, and particularly to a mounting device for a fuel pump disposed in a fuel tank.

(Prior art) Conventionally, fuel tanks in automobiles have often been installed on the underside of the floor. The lower part is approximately flat along the right. Moreover, the part facing the front side of the vehicle is easily damaged by flying stones, etc.
Since the side of the vehicle faces the body frame, when forming a gauge or fuel outlet on the fuel tank,
The rear facing portion of the vehicle is used for these. Incidentally, although the fuel pump that pumps fuel from the fuel tank can be relatively easily attached to the outer wall of the fuel tank, it is susceptible to damage as described above. In this respect, it is considered effective to mount the fuel pump inside the fuel tank, and mounting methods as shown in FIGS. 8a, b, c, and d are known. That is, as shown in FIG. 8a, an opening 3 is formed in the upper wall plate 2 of the fuel tank, a fuel pump 5 is introduced into the inner chamber 4 through this opening 3, and the opening 3 is closed with a normally closed lid 6. A fuel pump 5 is suspended from a downward surface of a normally closed lid 6 via a holder 7. Furthermore, as shown in Figure 8b,
The fuel pump 5 on the holder 7 is placed on the lower wall plate 9 of the fuel tank 1 via the insulator 8, and the upper part of the holder 7 is connected to the normally closed lid 6 via the bellows 10. Furthermore, as shown in FIG. 8c, the fuel pump 5
The vertical length L, which is the sum of the holder 7 supporting the holder 7 and the lower insulator 8, is approximately equal to the inner chamber 4 of the fuel tank 1.
The vertical width L1 of the normally closed lid 6 and the lower wall plate 9 are equal to each other.
The holder 7 side is held between the two. Furthermore, the eighth
As shown in FIG. Connect the upper end to the normally closed lid 6 side.

(Problem to be solved by the invention) However, in the case of the mounting method shown in FIG. A bending moment M is applied to the bending moment M, and at this time, a gap is likely to be created between the normally closed lid 6 and the seal 14, which may lead to loosening of the screw 15, etc. This is particularly likely to occur when a large load is applied during a collision. Furthermore,
In the case of the mounting method shown in FIG. 8b, the pump is subjected to its inertia force and the pressing force from the gasoline, and tilts as shown by the two-dot chain line, making it difficult to return to its original position, and the filter 16 sucks in air. easy. Furthermore, in the case of the mounting method shown in FIG. If the reaction force is large, the sealing performance of the normally closed lid 6 will deteriorate, and if the reaction force is small, problems similar to those shown in FIG. 8a will occur. Furthermore, in the case of the mounting method shown in FIG. 8d, it is necessary to fit the pump side into the clamp 12, and the opening 3 is required to have a large diameter to the extent that this work will not be hindered. The hose 13, which is expensive and has a diameter, is required for a relatively long time for installation work, and in addition to the high cost, there is always a bending part and there is a risk of bending. In this way, in the conventional mounting method, the vibration of the fuel pump itself can be prevented by the insulator 8, but the normally closed lid 6 is almost horizontal.
There are problems with the deterioration of sealing performance due to the bending moment M being applied to the bearings, and with measures against large loads such as those caused by impacts. An object of the present invention is to provide a fuel pump mounting device that can prevent the above-mentioned problems.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a fuel pump in which an opening through which the fuel pump can pass is formed in the side wall facing the rear of the vehicle, and a mounting hole is formed in the bottom wall. a tank, a vertically elongated holder that supports the fuel pump and is formed with a low-rigidity portion having a reduced cross-sectional area at the top; a generally vertical normally closed lid coupled to the holder; a downward nut attached to the lower part of the holder via a lower elastic body;
A fixing bolt screwed into the downward nut through the mounting hole, a hose connecting the fuel discharge pipe fixed to the normally closed lid and the fuel pump, and a horizontal part of the lower elastic body facing the front of the vehicle. The holder is characterized by comprising a cut groove cut in the direction, and a horizontal plate portion formed at the lower part of the holder so as to be elastically held in the cut groove.

(Function) Such a fuel pump mounting device supports the fuel pump in the fuel tank through the upper and lower elastic bodies, and transmits the load from the fuel pump side to the side normally closed lid and the bottom wall through the holder. In particular, when the fuel pump receives a large load, the horizontal plate part separates from the lower elastic body, and at the same time the hose and the low-rigidity part deform.

(Embodiment) FIG. 1 shows a fuel pump mounting device as an embodiment of the present invention. This fuel pump mounting device is an electromagnetic fuel pump 22 installed in an inner chamber 21 of a fuel tank 20 fixed to the lower surface of a rear floor of a vehicle body (not shown).
is to be installed. In FIG. 1, the right side of the fuel tank 20 is located at the rear end of the vehicle body, and the left side (not shown) faces the front, and includes a tank lower formed by a bottom wall 23 and a lower side wall 24, an upper wall 25, and an upper side wall. Both flange portions of the tank top formed by 26 and 26 are integrated by seam welding. A normally closed opening 27 facing toward the rear of the vehicle body is formed in the upper side wall 26, and a thick ring plate 28 is welded to the periphery of this opening. Furthermore, a ring-shaped seal 29 is provided on the inner peripheral side of the ring plate 28. A plurality of screw holes are formed in the ring plate 28 for tightening and fixing the normally closed lid 30 that closes the opening 27 with bolts 47. Therefore, when the normally closed lid 30 is bolted, the opening 27 is also reliably sealed by the seal 29. on the other hand,
A sheet metal reservoir 31 is welded to the upper surface of the bottom wall 23, which suppresses excessive flow of fuel within the interior chamber 21 when the vehicle turns or brakes, and serves as a fuel pump (hereinafter simply referred to as pump). Fuel to be supplied to 22 can be secured at all times. A holder 32, which will be described later, is attached to this reservoir 31 at the mounting position (first
As shown by a solid line in the figure, a guide 34 is welded to guide the holder 32 to a position where it is tightened and fixed by a plug 33, which will be described later. The guide 34 is formed with a substantially vertical curved surface 341 facing toward the opening 27, that is, the rear of the vehicle, and this surface substantially contacts a lower insulator 39, which will be described later. The bottom wall 23 has a protruding flat portion 231 formed at a position close to directly below the opening 27 . Moreover, the flat part 231 protrudes somewhat upwardly from the hole formed in the middle of the reservoir 31,
A mounting hole 35 is formed in the center thereof. A holder 32, which is a vertically elongated press-molded product, is provided between the flat portion 231 and the normally closed lid 30. As shown in FIG.
A pair of left and right upper mounting holes 322 are formed at the upper part of the fixing means 36 via a low rigidity part 324 and a bent part 321, and a lower mounting part 323 is formed at the lower part of the fixing means 36. Note that it is desirable that the low-rigidity portion 324 be disposed at a position facing a hose 42, which will be described later. Both upper mounting holes 322 are fitted into a pair of left and right upper bolts 37 that protrude from the inner surface of the normally closed lid 30 toward the inner chamber 21 via upper insulators 38 made of a cylindrical elastic body, and are tightened with nuts 45. There is. The low rigidity part 324 is a square hole 3
It consists of two thin columns sandwiching 25, and the cross-sectional area is significantly reduced compared to the central part. For this reason, the rigidity is significantly reduced compared to other parts, and the holder is set to be most likely to deform when external force is applied to it. Note that instead of the holder shown in FIG. 6, the entire upper side may be formed of two thin columns as shown in FIG. In this case, the low rigidity portion 324 can be formed larger.

As shown in FIGS. 4 and 5, the lower mounting portion 323 is formed of a vertical piece portion 323a bifurcated left and right, and a horizontal plate portion 323b connecting these portions. This horizontal plate portion 323b has a recess 323c formed at its center toward the rear of the vehicle, and is held in a cut groove 391 of a lower insulator 39 made of an elastic body. That is, the lower insulator 39 is a substantially semicircular member having a thickness T, and its upper plane is connected to the pump 2.
The lower surface of the mounting surface of No. 2 can be brought into close contact with the flat portion 231. Furthermore, the lower insulator 39 is formed with a groove 391 cut horizontally toward the rear of the vehicle from a portion facing the front of the vehicle, and this cut groove 391 has approximately the same shape as the horizontal plate portion 323b when viewed from above. (see Figure 5). Furthermore, a downward screw hole 401 is provided in the lower insulator 39.
A downward nut 40 having a shape formed therein is embedded. This downward nut 40 has a body portion attached to a horizontal plate portion 323.
Flange portions 402 and 403 are formed above and below the concave portion 323c of b. Upper flange 402
is the clamping part 392 (fourth part) of the lower insulator 39.
(see figure) so that the horizontal plate portion 323b can be pressed downward. Furthermore, the downward nut 40 is formed with a protrusion 404 at its lower end. As shown in FIG. 3, this protrusion 404 has a shape that can be fitted into the attachment hole 35. The mounting hole 35 has a pair of parallel end portions 351, 351, which prevents the downward nut 40 from spinning idly. Here, when the downward nut 40 is fitted into the mounting hole 35, the pump 2
The holder 32 supporting the holder 2 is held at the mounting position, and the side of the boulder 32 at this mounting position is fixed to the bottom wall 23 by a plug 33 serving as a fixing bolt passing through a mounting hole 35 through a downward nut 40 at the lower end of the holder 32. be done. Note that the plug 33 is a ring-shaped seal 4.
1 is placed around the mounting hole 35, this seal 41 and the lower insulator 39
The airtightness of the mounting hole 35 can be maintained reliably.

The fixing means 36 of the holder 32 is for holding the cylindrical pump 22 at the upper and lower sides, and each holding piece 361, 36 is made of a pair of elastic spring steel plates.
1. A flexible hose 42 extends from the upper end of the pump 22, and the upper end of the hose passes through the normally closed lid 30 and is connected to a fuel pipe 43 as a metal fuel discharge pipe that is brazed. Note that the fuel pipe 43 is made of metal and tends to be used in a long length due to its sufficient gasoline resistance and pressure resistance, but if it is subjected to excessive external force, the welded part with the normally closed lid 30 may be bent greatly. Moment is added and fuel leaks are likely to occur. On the other hand, although the hose 42 can absorb bending moments, it has inferior gasoline resistance and pressure resistance compared to metal pipes, and is expensive, so it tends not to be used in very long lengths. Therefore, the combination of the two can prevent deformation of the metal pipe at the time of excessive input and provide sufficient durability. Note that a pipe-shaped filter 4 is provided at the lower end of the pump 22 to guide fuel from the bottom wall side into the pump.
4 is installed.

With such a fuel pump mounting device, pump 2
2, first, the pump 22 and the lower insulator 39 in which the downward nut 40 is embedded are respectively attached to the holder 32 outside the fuel tank 20. Then, the upper part of the holder 32 is fitted into the upper bolt 37 on the side of the normally closed lid 30 via the upper insulator 38, and is tightened and fixed with the nut 45. Then, the pump 22 is connected to the fuel pipe 43 via the hose 42. The holder 32 side member assembled in this way is inserted into the inner chamber 21 through the opening 27, and the lower insulator 3 located at the lower part of the holder 32 is inserted into the inner chamber 21 through the opening 27.
9 and the vertical piece 323a on the curved surface 3 of the guide 34.
41 and slide down. At this time, curved surface 3
41 is the downward nut 4 on the lower insulator 39 side.
Guide the lower part of the holder side so that 0 faces the mounting hole 35. At the same time as the normally closed lid 30 closes the opening 27, the protrusion 40 of the downward nut is inserted into the mounting hole 35.
It acts to fit 4. After this, plug 33
As a result, the mounting hole 35 is sealed and the holder 32 side is fixed to the bottom wall 23. Further, the normally closed lid 30 is fixed to the upper side wall 26 by a plurality of bolts 47. At this time, the seal 29 ensures airtightness between the opening 27 and the normally closed lid 30. When the pump 22 installed in this manner is subjected to inertial force due to vertical, longitudinal, horizontal, and horizontal turning or pressing force of flowing fuel from the vehicle body side, the load is distributed and transmitted to the upper and lower insulators 38 and 39. . In particular, the vertical load is mainly transmitted to the bottom wall 23 via the lower insulator 39, and the horizontal load is mainly transmitted to the normally closed lid 30 via the upper insulator 38. In this case, the forward load that occurs most often when a vehicle suddenly stops is applied as a horizontal external force to the generally vertically oriented normally closed lid 30, and at this time, generation of a bending moment is prevented, and the normally closed lid 30 and the seal 29 There is no gap between the two and the sealing performance is maintained. On the other hand, when the vehicle receives a large load due to a collision or the like, the fuel pump 22 is pushed forward of the vehicle due to the large load, and at this time, the horizontal plate part that is elastically held in the cut groove 391 of the lower insulator 323b separates from the cut groove 391 and moves to the variable position shown by the two-dot chain line in FIG. At this time, the hose 42 and the low-rigidity portion 324 located opposite thereto are both curved and deformed. Here, the fuel pipe 43 itself, which penetrates the normally closed lid 30 and is brazed to the lid, does not interfere with the holder 32, and no bending moment is applied to the brazed portion, preventing fuel leakage due to damage to the welded portion. Prevented.

(Effects of the invention) As described above, this invention has the effect of
The lower part of the holder on the fuel pump side will separate from the bottom wall side,
Since the low-rigidity portion of the holder can curve and absorb excessive loads, deformation of the flat portion surrounding the mounting hole, the lower elastic body, the downward nut, etc. can be prevented. Moreover, since the external force from the pump side is applied as a horizontal load to the normally closed lid, which is oriented vertically, the bending moment applied to the upper elastic body is reduced, and the sealing performance of the opening is maintained. No damage is caused to the welded part with the discharge pipe, and fuel leakage can be prevented.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a fuel pump mounting device as an embodiment of the present invention, Fig. 2 is a sectional view taken along the line A-A in Fig. 1, and Fig. 3 shows the mounting hole and downward nut in Fig. 1. 4 is a sectional view taken along line B-B in FIG. 1, FIG. 5 is a sectional view taken along line C-C in FIG. 1, and FIGS.
The figures show side views of different holders, and FIG. 8 shows a schematic diagram illustrating different conventional fuel pump mounting methods. 20...Fuel tank, 22...Pump, 23...
...bottom wall, 26...upper side wall, 27...opening, 30
... Normally closed lid, 32 ... Holder, 322 ... Upper mounting hole, 33 ... Plug, 34 ... Guide, 35 ...
...Mounting hole, 38...Upper insulator, 39...
...Lower insulator, 40...Downward nut, 4
2...Hose, 43...Fuel pipe, 323b...
...Horizontal plate part, 391... Cut groove.

Claims (1)

[Scope of utility model registration request] A fuel tank having an opening through which the fuel pump can pass is formed in the side wall facing the rear of the vehicle and a mounting hole formed in the bottom wall, and a low-rigidity part that supports the fuel pump and has a reduced cross-sectional area at the top. a vertically elongated holder formed with a holder, a generally vertical normally closed lid that always closes the opening and is connected to the upper side of the holder above the low-rigidity part via an upper elastic body, and a lower elastic body at the bottom of the holder. a downward nut attached to the lower nut; a fixing bolt screwed into the downward nut through the mounting hole; a hose connecting the fuel pump to the fuel discharge pipe fixed to the normally closed lid; It is characterized by comprising a cut groove cut horizontally into a portion of the elastic body facing the front of the vehicle, and a horizontal plate portion formed at the lower part of the holder so as to be elastically held in the cut groove. Fuel pump mounting device.