JP2518141Y2 - Fuel tank with built-in pump - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a pump-incorporated fuel tank having a built-in fuel pump for supplying fuel to, for example, an automobile engine.

[Conventional technology]

A fuel tank with a built-in pump according to the prior art is shown in FIGS. 3 and 4. In the figure, 1 is a tank main body for storing fuel, and the tank main body 1 includes a bottom plate 1A and four side plates 1B, 1C,
1D, 1E (however, 1D, 1E are not shown) and step 2 at the top center
And the top plate 1F on which is formed. 3 is a pump insertion port formed in the top plate 1F located in the step part 2 of the top plate 1F, and a ring fitting groove 4 is provided on the upper surface of the step part 2 so as to surround the pump insertion port 3. The bolt insertion holes 5, 5, ... Are formed on the outside of the ring fitting groove 4 and are spaced apart in the circumferential direction.
Has been drilled. On the other hand, a ring-shaped bolt screwing plate 6 is fixed to the inner surface side of the top plate 1F, and the bolt screwing plate 6 has a female screw portion 6 having a bottom corresponding to the bolt insertion holes 5, 5 ,.
A, 6A, ... are formed.

Reference numeral 7 denotes a pump support lid for supporting a fuel pump 11 which will be described later with respect to the tank body 1. The pump support lid 7 has a convex bulging portion 7A.
And a pump insertion port 3 formed around the convex bulge 7A
It has a larger diameter flange portion 7B and bolt insertion holes 7C, 7C, ... Formed in the flange portion 7B. The pump support lid 7 is arranged on the upper side of the top plate 1F so as to sandwich the O-ring 8 fitted in the ring fitting groove 4, and the bolt 9 inserted in the bolt insertion hole 7C, 5 is internally threaded. It is fastened to the tank body 1 so as to cover the pump insertion port 3 by screwing it into the portion 6A.

10, 10 are a pair of brackets projecting downward from the pump support lid 7, 11 is a roller vane type fuel pump, for example, and the upper side of the fuel pump 11 is the brackets 10, 10.
It is suspended in the tank body 1 in a state of being sandwiched between.
Further, the fuel pump 11 has a suction pipe 12 connected to the lower end side and a discharge pipe 13 connected to the upper end side, and the fuel discharged from the fuel pump 11 in the middle of the discharge pipe 13. And a fuel damper 14 for smoothing by suppressing the pulsation of the fuel and a relief for relieving a part of the fuel as excess fuel in the tank body 1 through a relief pipe (not shown) when the fuel pressure exceeds a predetermined value. Valve 15
Is provided. Further, a discharge pipe 16 is connected to the tip end side of the discharge pipe 13, and another fuel damper 17 for suppressing the fuel pulsation that was not suppressed by the fuel damper 14 is provided in the middle of the discharge pipe 16. .

Next, 18, 18, ... Are a plurality of baffle plates provided to suppress the vibration and flow of the fuel in the tank body 1. Each of the baffle plates 18 has a base end side 18A on the inner surface of the top plate 1F. It is fixed by means such as spot welding, and the tip ends 18B, 18B are in a state of protruding downward in the middle of the tank body 1.

Further, 19 is a chamber fixed to the inner surface of the bottom plate 1A of the tank body 1, and 20 and 20 are mel sheets as vibration damping materials which are respectively adhered to the outer surface of the bottom plate 1A and the outer surfaces from the side plates 1B to the top plate 1F.

[Problems to be solved by the device]

Although the conventional fuel tank with a built-in pump is configured as described above, it has the following problems. That is, the fuel pump 11
When the fuel pump operates to pump the fuel in the tank body 1 to the engine side, the entire fuel pump 11 vibrates due to various causes such as shaft runout of the motor.
Is transmitted to the pump support lid 7 via. Pump support lid 7
Is clamped to the top plate 1F of the tank body 1 with the O-ring 8 sandwiched therebetween, but the vibration is transmitted to the tank body 1 via the bolt 9 and the bolt screwing plate 6, and the tank body 1 and the baffle plate 18 , 18 will be vibrated.

At this time, if the vibration frequency of the fuel pump 11 and the vibration frequency of the tank body 1 or the baffle plates 18, 18 match, the amplitude of the vibration increases due to resonance, causing a phenomenon in which an unpleasant growling noise is generated.

Therefore, the following means have been conventionally adopted as a measure for suppressing the vibration at each of the above-mentioned parts. First, regarding the tank body 1 side, firstly, the mel sheet 20, 20 as a damping material is attached to the outer surface of the tank body 1 to
Suppresses the vibration of. Secondly, the pump supporting lid 7 is kept floating from the top plate 1F via the O-ring 8 by adjusting the tightening force of the bolts 9, 9, ... Prevent transmission to the side. Thirdly, by providing the fuel damper 17 in the discharge pipe 16, the vibration of the discharge pipe 16 and the accompanying vibration of the pump support lid 7 are suppressed.

On the other hand, the following measures are taken to suppress the vibration on the fuel pump 11 side. That is, first, since the vibration is small when the rotation speed is low, for example, the fuel pump with a discharge flow rate of 210 to 250 l / H is replaced with a fuel pump with a discharge flow rate of 210 to 230 l / H. Second, the applied voltage during idling is 5.9V to 5.6V.
To reduce the rotation speed. Thirdly, the fuel pump 11 whose vibration is 31 dB or less is used as the vibration of the fuel pump alone.

As described above, in the prior art, various measures have been taken as a noise prevention measure, but due to the structure of the fuel tank, transmission of vibrations cannot be completely prevented, and roaring noise cannot be prevented.

The present invention has been made in view of the above-mentioned drawbacks of the prior art, and provides a fuel tank with a built-in pump in which vibration of the fuel pump can be completely cut off from the tank body.

[Means for solving the problem]

In order to solve the above-mentioned problems, the present invention provides a tank main body having a pump insertion opening in a top plate portion, and the tank main body so as to cover the pump insertion opening to support a fuel pump in the tank main body. It is intended for a fuel tank with a built-in pump, which includes a pump support lid having a flange portion.

The feature of the means adopted by the present invention is that a single vibration-damping member including a lower shock-absorbing part, an upper shock-absorbing part and a flange fitting groove formed between the shock-absorbing parts, and the vibration-damping member. In the state where the flange portion of the pump support lid is fitted in the flange fitting groove portion of the member, a sandwiching member that sandwiches the vibration isolating member between the top plate portion and the pump supporting lid is formed by the vibration isolating member. In order to support the anti-vibration, it is composed of fixing means for fixing the holding member to the top plate portion.

[Action]

With the flange portion of the pump support lid fitted in the flange fitting groove of the vibration isolating member, the vibration isolating member is sandwiched between the top plate portion and the sandwiching member, and the sandwiching member and the vibration isolating member are secured by the fixing means. By fixing the, the flange portion of the pump support lid is vibration-isolated and supported between the upper cushioning portion and the lower cushioning portion of the vibration isolating member, and the vibration transmitted from the fuel pump to the pump supporting lid is The vibration is prevented from being absorbed by the member and transmitted to the tank main body side, and the flange portion of the pump support lid is fitted into the flange fitting groove portion of the vibration isolating member, so that the flange portion is radial direction. To prevent the pump support lid from moving in the radial direction.

〔Example〕

Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. 1 and 2. The same components as those of the conventional technique described above are designated by the same reference numerals, and the description thereof will be omitted.

Therefore, in the drawing, 21 is a tank main body, 22 is a top plate of the tank main body 21, and the top plate 22 is composed of a top plate main body 23 having a large-diameter opening 23A and a pump support plate 24 described later. Has been done. Reference numeral 24 denotes a pump support plate integrally provided by spot welding on the inner surface of the top plate body 23 facing the opening 23A, and the pump support plate 24 has a pump insertion port 24A formed at the center thereof and the pump A seal fitting groove 24B is formed in an annular shape so as to surround the insertion opening 24A, and a plurality of bottomed female screw portions 24C, 24C, ... Are circumferentially spaced apart from each other outside the seal fitting groove 24B. Individually formed.

25 is a pump support lid, and the pump support lid 25 is similar to the pump support lid 7 of the prior art, and has a convex bulge portion 25A and a pump insertion port 2
It is formed from a flange part 25B with a diameter larger than 3A,
Bolt holes 7C, 7C, ... Are not provided.

Next, 26 is an anti-vibration rubber seal as an anti-vibration member interposed between the pump support lid 25 and the pump support plate 24,
The anti-vibration rubber seal 26 is a seal fitting groove of the pump support plate 24.
An annular lower buffer portion 26A fitted to 24B, and the lower buffer portion 26
An upper buffer portion 26B which is integrally formed on the upper side of A and is configured to integrally cover from the flange portion 25B of the pump support lid 25 to the outer peripheral surface of the convex bulging portion 25A, and the upper buffer portion 26B and the lower side. It is composed of a flange fitting groove portion 26C located between the cushioning portion 26A and radially outward, and a holding member engaging groove 26D circumferentially provided on the upper outer peripheral surface of the upper cushioning portion 26B. ing.

On the other hand, 27 is a sandwiching member that secures the vibration-proof rubber seal 26 between it and the pump support plate 24, and the sandwiching member 27 is an annular fixing portion 27A that is pressed against the upper surface of the pump support plate 24.
A plurality of bolt insertion holes 27B, 27B, ... Bored in the fixing portion 27A so as to correspond to the female screw portions 24C, 24C of the pump support plate 24.
And the peripheral wall portion 27C that rises upward from the inner peripheral edge of the fixed portion 27A.
And an annular engaging portion 27D that projects radially inward from the upper end of the peripheral wall portion 27C.

The present embodiment is configured as described above, and the order of assembling will be described next. First, the vibration-proof rubber seal 26 is fitted on the outside of the pump support lid 25. Next, after fitting the lower cushioning portion 26A of the vibration isolating rubber seal 26 into the seal fitting groove 24B of the pump support plate 24, the clamping member 27 is put on the upper side of the vibration isolating rubber seal 26 to form an annular engagement. Portion 27D sandwiching member engaging groove 26D
Fit inside. Finally, the holding member 27 is fastened to the pump support plate 24 by using bolts 9, 9, ... As fixing means. The pump support lid 25 supporting the fuel pump 11 via the bracket 10 is in a state of being vibration-proof supported by the pump support plate 24 only via the vibration-proof rubber seal 26.

According to the present embodiment configured as described above, the flange portion 25B of the pump support lid 25 is located between the lower cushioning portion 26A and the upper cushioning portion 26B of the anti-vibration rubber seal 26, and has a flange fitting. It is supported by the pump support plate 24 of the top plate 22 only through the vibration-proof rubber seal 26 in a state of being fitted in the mating groove portion 26C.
Here, since the anti-vibration rubber seal 26 absorbs the vibration of the fuel pump 11, it is possible to almost prevent the vibration of the fuel pump 11 from being transmitted to the tank body side, and the tank body 21, the baffle plate 18, etc. growl. The generation of sound can be prevented. Moreover, since the flange portion 25B of the pump support lid 25 is fitted in the flange fitting groove portion 26C of the vibration isolating rubber seal 26 to surround the flange portion 25B in the radial direction, the vibration isolating rubber seal 26 is formed. This can prevent the pump support lid 25 from moving in the radial direction.

Further, according to the present embodiment, by fitting the annular engaging portion 27D of the sandwiching member 27 into the sandwiching member engaging groove 26D located on the upper side of the anti-vibration rubber seal 26, during acceleration and deceleration of the vehicle and curve. The pump support lid 25 can be prevented from moving due to the inertial force received during traveling.

In this embodiment, the top plate 22 of the tank body is replaced by the top plate body 23.
However, the present invention is also applicable to a tank body in which a pump insertion port, a seal fitting groove, and an internal thread portion are formed in the top plate itself as in the prior art. Is. Further, although the embodiment has exemplified the roller vane type fuel pump 11 as a fuel pump, the same effect can be obtained also in a fuel tank having a turbine type fuel pump built therein.

[Effect of device]

The present invention is as described in detail above, wherein the flange portion of the pump support lid for supporting the fuel pump is fitted into the flange fitting groove portion of the vibration isolator, and the lower cushioning portion and the upper cushioning portion of the vibration damping member are fitted. Since the anti-vibration member is sandwiched between the top plate portion and the sandwiching member in order to prevent and support it between, the fixing means fixes the sandwiching member and the anti-vibration member to the top plate portion. The vibration transmitted from the fuel pump to the pump support cover is reliably absorbed by the vibration isolator, and it is possible to reliably prevent the vibration of the fuel pump from being transmitted to the tank body side, and to make the fuel tank a roaring noise. In addition, the flange portion of the pump support lid is surrounded by the flange fitting groove portion of the vibration isolating member, and it is possible to prevent the pump support lid from moving in the radial direction.

[Brief description of drawings]

1 and 2 relate to an embodiment of the present invention. FIG. 1 is a sectional view of a main part of a fuel tank with a built-in pump, FIG. 2 is a sectional view of a top plate constituting the tank body, and FIG. FIG. 4 is a cross-sectional view of a fuel tank with a built-in pump according to the prior art, and FIG. 4 is an enlarged view of a main part in FIG. 11 …… Fuel pump, 21 …… Tank body, 22 …… Top plate, 24
A: Pump insertion port, 25: Pump support lid, 26: Anti-vibration rubber seal.

Claims (1)

(57) [Scope of utility model registration request] 1. A tank main body having a pump insertion opening in a top plate portion, and a flange portion provided in the tank main body so as to cover the pump insertion opening in order to support a fuel pump in the tank main body, and a flange portion. In a fuel tank with a built-in pump including a pump support lid, a single vibration damping member including a lower cushioning portion, an upper cushioning portion, and a flange fitting groove portion formed between the respective cushioning portions; A sandwiching member for sandwiching the vibration isolating member with the top plate portion in a state where the flange portion of the pump supporting lid is fitted in the flange fitting groove portion of the vibrating member; In order to support anti-vibration with
A fuel tank with a built-in pump, comprising a fixing means for fixing the holding member to the top plate portion.