JP2002256993A - Fuel supplying device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent sulfur component from being eluted in fuel from a rubber material by using the rubber material vulcanized by organic peroxide and to reduce cost. SOLUTION: A vibration control member 19 is provided between a lower side bracket 10 and a fuel pump 11. A seal member 21 is provided between a discharge port 11B and a filter case 6. A fuel filter 12 is provided with a seal ring 22 for sealing an inflow chamber 16 and an outflow chamber 17. The vibration control member 19, the seal member 21 and the seal ring 22 are formed by adding organic peroxide 20 to NBR at a prescribed ratio. As a result, the sulfur component in the rubber material can be prevented from being eluted in fuel within a tank 1 and sticking to a power feeding terminal of the fuel pump 11, reliability can be improved and cost can be reduced as compared with fluorine-contained rubber.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel supply apparatus suitably used for supplying fuel contained in a fuel tank of an automobile or the like to an engine.

[0002]

2. Description of the Related Art In general, as a fuel supply device mounted on a vehicle such as an automobile, an in-tank type fuel supply device in which a fuel pump is disposed in a tank is widely used, and the fuel is discharged by the fuel pump. The fuel is supplied to the fuel injection valve of the engine.

[0003] This type of prior art fuel supply system is:
A fuel tank for storing fuel therein, a mounting bracket mounted above the fuel tank and provided with a fuel passage, and a fuel tank located in the fuel tank and mounted to the mounting bracket to suck fuel in the fuel tank An electric fuel pump that sucks into a suction port from a filter and discharges the fuel passage from a discharge port, and a fuel filter that is attached to the mounting bracket and filters fuel discharged from the discharge port of the fuel pump to the fuel passage. It is comprised including.

The fuel supply device further includes a vibration damping member provided between the mounting bracket and the fuel pump to prevent vibration of the fuel pump, and a pump for sealing a discharge port of the fuel pump to the mounting bracket. And a filter sealing member provided between the mounting bracket and the fuel filter for sealing between the inflow side and the outflow side of the fuel filter. Further, the vibration isolating member and the seal member are made of, for example, a rubber material obtained by subjecting NBR to a vulcanization treatment with sulfur, a fluororubber, or the like.

During operation of the engine, when power is supplied from a battery of the vehicle to a power supply terminal of the fuel pump, the fuel pump sucks fuel in the tank through a suction filter through the suction port, and discharges the fuel. From the fuel passage of the mounting bracket. Further, the discharged fuel flows into the fuel filter via the fuel passage, is filtered by the fuel filter, and then guided to the outside of the fuel tank from a supply port provided on the upper surface side of the mounting bracket, and is provided through a pipe or the like. And supplied to the fuel injection valve of the engine.

In this case, the vibration isolating member of the fuel supply device prevents vibrations of the vehicle or the like from being transmitted to the fuel pump via the mounting bracket, and each seal member causes fuel leakage in the fuel pump and the fuel filter. It is what prevents.

[0007]

In the above-mentioned prior art, however, for example, NB which has been vulcanized with sulfur is used.
An anti-vibration member and a seal member are formed by R, fluorine rubber, and the like, and these members are arranged in a tank together with a fuel pump, a fuel filter, and the like.

However, in the in-tank type fuel supply device, the fuel pump, the fuel filter, and the like are often immersed in the fuel in the tank. If the rubber material contains a sulfur component due to vulcanization or the like, this sulfur component will gradually elute into the fuel in the tank, for example, adhere to the power supply terminal of the fuel pump, etc., and form an insulating film. May form.

For this reason, in the prior art, while the in-tank type fuel supply device has been used for a long period of time, there is a possibility that the power supply terminal of the fuel pump may have poor contact due to the sulfur component contained in the rubber material. There was.

Further, for example, when fluororubber or the like having high chemical stability in a fuel is used as a rubber material, the use of expensive fluororubber leads to an increase in the cost of the entire apparatus. Not just the feeder,
There is a problem that the merchantability of the vehicle is reduced.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art.
To provide a fuel supply device capable of reliably executing a seal or the like, stably maintaining an electrical connection state of a fuel pump or the like over a long period of time, and improving reliability while reducing costs. It is in.

[0012]

In order to solve the above-mentioned problems, a first aspect of the present invention is to provide a fuel tank for storing fuel therein and directing the fuel from the fuel tank to the outside of the fuel tank. In a fuel supply device including a fuel pump that discharges fuel and a fuel passage through which fuel discharged from the fuel pump flows toward the outside of the fuel tank, a portion that comes into contact with the fuel in the fuel tank includes: 10 NBR
A rubber material formed by adding 0.8 to 2.4 parts by weight of an organic peroxide to 0 part by weight is used.

[0013] With this configuration, it is possible to perform a vulcanization treatment by adding an organic peroxide to NBR, to form a rubber material without vulcanizing sulfur or the like, and to use this rubber material. It can be used for each part of the fuel supply device that comes into contact with the fuel in the tank. That is, for example, a seal member, a vibration isolating member, a connecting pipe member, and the like provided in each part such as a fuel pump, a fuel filter, and a fuel passage can be formed of the rubber material. Elution of the components can be prevented, and the cost can be reduced. Also, NB
R is 100 parts by weight and the organic peroxide is 0.8 to 2.
By adding at a ratio (mixing ratio) of 4 parts by weight, a sufficient strength can be ensured as compared with, for example, a conventional rubber material vulcanized with sulfur or the like.

Further, according to the present invention, the fuel tank is provided with a bracket for supporting the fuel pump, and a vibration isolating member formed of the rubber material is provided between the fuel pump and the bracket. I have.

Thus, by adding the organic peroxide to the NBR at a predetermined ratio, a vibration-proof member containing no sulfur component can be formed at a low cost, and external vibrations and the like can be formed by the vibration-proof member via the bracket. To be transmitted to the fuel pump.

According to a third aspect of the present invention, a fuel filter is provided in the fuel passage for filtering and flowing out fuel flowing from a discharge port of the fuel pump, and a discharge port of the fuel pump and an inflow of the fuel filter are provided. A seal member made of the rubber material is provided between the fuel filter and the fuel filter, or between the outflow side of the fuel filter and the fuel passage.

Thus, for example, a seal member for sealing a space between the fuel pump, the fuel filter, the fuel passage, and the like can be formed of a rubber material that has been vulcanized with an organic peroxide.

According to the fourth aspect of the present invention, the inside of the fuel filter is formed using the rubber material, and the fuel discharged from the discharge port of the fuel pump and filtered by the filter element of the fuel filter. A configuration is provided in which a sealing member for sealing between the fuel and the fuel is provided.

Thus, a seal member provided inside the fuel filter can be formed of the rubber material, and the seal member can seal between the inflow side and the outflow side of the fuel filter.

Further, according to the invention of claim 5, the rubber material contains 0.1 parts by weight of NBR and 0.1 parts by weight of an aldehyde / ketone / amine-based or imidazole-based antioxidant.
It is configured to be formed by adding at a ratio of 5 to 2 parts by weight.

Thus, the anti-aging agent can prevent the rubber material from aging (deteriorating) due to the passage of time, temperature change, and the like, and its compounding ratio is 0.5 to 100 parts by weight of NBR. By using 2 parts by weight, the durability of the rubber material can be stably increased.

According to the sixth aspect of the present invention, the rubber material is formed by adding an acid acceptor composed of a metal oxide in a ratio of 2 to 10 parts by weight to 100 parts by weight of NBR. I have.

With this, the acid acceptor can deoxygenate excess organic peroxide remaining in the NBR, and the crosslinking of the NBR proceeds even after the rubber material is produced due to the excess organic peroxide. Excessive curing of the material can be prevented. Further, by setting the compounding ratio of the acid acceptor to 2 to 10 parts by weight with respect to 100 parts by weight of NBR, the crosslinking of the NBR by the organic peroxide is appropriately advanced, and the strength of the rubber material is sufficiently secured. Its flexibility can be maintained for a long time.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a fuel supply device according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIGS. 1 to 5 show a first embodiment of the present invention. In this embodiment, a case where a fuel supply device is applied to an automobile engine will be described as an example.

Reference numeral 1 denotes a fuel tank which is provided in a vehicle such as an automobile and stores fuel therein. The fuel tank 1 is formed of, for example, a resin material and has an upper surface 1A, a lower surface 1B and the like. The upper surface 1A is provided with a mounting hole 1C for a mounting bracket 2 described later.

Reference numeral 2 denotes a mounting bracket mounted on a mounting hole 1C of the fuel tank 1. The mounting bracket 2 includes an upper bracket 3, a filter case 6, and a lower bracket 10 which will be described later, as shown in FIGS. It is comprised including.

Reference numeral 3 denotes an upper bracket constituting the upper side of the mounting bracket 2, and the upper bracket 3 is shown in FIGS.
As shown in the figure, a substantially circular plate-shaped flat portion 3A and a substantially arc-shaped cylindrical portion 3B protruding downward from the flat plate portion 3A and fitted to the outer peripheral side of the filter case 6 in a retaining state. It is configured.

Here, the flat plate portion 3A is mounted on the upper surface portion 1A of the fuel tank 1, and closes the mounting hole 1C. Further, the flat plate portion 3A is provided with a supply pipe 4 for supplying the fuel in the fuel tank 1 to the outside and a connector 5 for supplying power to a fuel pump 11 described later. As shown in FIG. 1, the supply pipe 4 has a lower portion protruding downward from the flat plate portion 3A, and serves as a connection portion 4A to which a fuel outlet 6F of a filter case 6 described later is connected. Further, the cylindrical portion 3B is hung down into the tank 1 through the mounting hole 1C of the fuel tank 1, and a filter case 6, a fuel pump 11
And the like are immersed in the fuel in the tank 1 and supported.

Reference numeral 6 denotes a filter case which constitutes an intermediate portion in the upper and lower directions of the mounting bracket 2. The filter case 6 is made of, for example, a resin material and is formed in a double cylindrical shape as shown in FIG. The claw provided on the side of the fuel tank 1 is attached to the upper surface portion 1A of the fuel tank 1 via the upper bracket 3 by being engaged with a mounting hole provided in the cylindrical portion 3B of the upper bracket 3.

The filter case 6 has an inner cylindrical portion 6A.
An outer cylindrical portion 6B disposed on the outer peripheral side of the inner cylindrical portion 6A with a gap therebetween; and an annular bottom portion 6C connecting the inner cylindrical portion 6A and the outer cylindrical portion 6B at the upper end and the lower end, respectively. , Lid 6
D, a substantially square passage portion 6E that protrudes upward from the lid portion 6D and has a fuel passage 9 described later formed therein, and a cylindrical fuel outlet 6 that protrudes upward from the lid portion 6D.
F, a regulator fitting cylinder 6G and the like.

The inner peripheral side of the inner cylindrical portion 6A is a pump housing space 7 located outside the filter case 6, and an annular filter housing space 8 is provided between the inner cylindrical portion 6A and the outer cylindrical portion 6B. It is defined. The lower side of the fuel outlet 6F communicates with an outflow chamber 17 of a fuel filter 12 described later, and the upper side thereof is connected to a connecting portion 4A of the supply pipe 4 as shown in FIG. Furthermore, the regulator fitting cylinder 6
G has an inner peripheral side communicating with the outflow chamber 17 and a pressure regulator 18 described later is attached thereto.

Reference numeral 9 denotes a substantially U-shaped fuel passage provided in the passage portion 6E of the filter case 6.
As shown in FIG. 5, the inflow side is a connection port 9A for connecting a discharge port 11B of the fuel pump 11 described later, and the outflow side thereof communicates with an inflow chamber 16 of a fuel filter 12 described later. The fuel passage 9 is provided at the discharge port 1 of the fuel pump 11.
The fuel discharged from the fuel tank 1B flows toward the outside of the fuel tank 1.

Numeral 10 is a substantially bottomed cylindrical lower bracket constituting the lower side of the mounting bracket 2.
Numeral 0 is attached to the lower outer peripheral side of the filter case 6 and covers the pump housing space 7 from below. The lower bracket 10 supports the fuel pump 11 from below through a vibration isolating member 19 to be described later, and prevents the fuel pump 11 from being pulled out into the pump housing space 7.

Reference numeral 11 denotes an electric fuel pump housed in the pump housing space 7 of the filter case 6. The fuel pump 11 has a suction port 11A for sucking fuel in the fuel tank 1 as shown in FIG. And a discharge port 11B for discharging the fuel into the fuel passage 9 of the filter case 6. A suction filter 11C is provided in the suction port 11A (see FIG. 1).
The discharge port 11B is connected to a connection port 9A of the fuel passage 9 via a seal member 21 described later. The fuel pump 11 has a power supply terminal (not shown) exposed in the fuel tank 1. The power supply terminal is connected to the connector 5 on the lower surface side of the flat plate portion 3A of the upper bracket 3 by a lead wire or the like. ing.

Reference numeral 12 denotes a fuel filter for filtering fuel discharged from the fuel pump 11. The fuel filter 12 includes a filter case 6 and a cylindrical filter element housed in a filter housing space 8 of the filter case 6. 13
And upper and lower mounting rings 14 and 15 attached to the upper and lower ends of the filter element 13 and fitted to the inner peripheral side of the outer cylindrical portion 6B of the filter case 6, respectively. I have.

The filter element 13 defines the inside of the filter accommodating space 8 into an inflow chamber 16 on the outer circumference side and an outflow chamber 17 on the inner circumference side.
It is liquid-tightly shut off by a filter seal ring 22 described later. The filter element 13 transfers the fuel discharged from the fuel pump 11 from the inflow chamber 16 to the outflow chamber 17.
The fuel is circulated radially inward to clean the fuel.

Reference numeral 18 denotes a pressure regulator fitted to the regulator fitting cylinder 6G of the filter case 6. The pressure regulator 18 has an inlet 18A through which fuel flows out of the outlet chamber 17 of the fuel filter 12, and an inlet 18A. A return port 18B through which a part of the fuel flowing out of the fuel flowing from the pressure regulator 18 into the pressure regulator 18 flows out, and an inlet 18A provided inside the pressure regulator 18 according to the pressure of the fuel flowing from the flow inlet 18A. An opening / closing mechanism (not shown) for communicating with and shutting off the return port 18B is provided, and an outflow pipe 18C is attached to a tip end of the return port 18B.

The pressure regulator 18 supplies excess fuel from the fuel flowing into the inside through the inlet 18A to the fuel tank 1 through the outlet 18B through the outlet pipe 18C.
To adjust the pressure in the outflow chamber 17 of the fuel filter 12 and to keep the pressure of the fuel supplied from the supply pipe 4 to the fuel injection valve (not shown) of the engine constant. It is.

Reference numeral 19 denotes the lower bracket 10 and the fuel pump 1
The vibration isolating member 19 is provided between
It is formed of an annular elastic body, and is located between the lower bracket 10 and the fuel pump 11 and is fitted to the outer peripheral side of the connection portion between the suction port 11A of the fuel pump 11 and the suction filter 11C. The vibration isolating member 19 is connected to the fuel pump 1.
1 is elastically supported from below to prevent vibrations of the vehicle from being transmitted from the mounting bracket 2 to the fuel pump 11.

Here, as shown in FIG. 4, the vibration isolating member 19 is made of, for example, NBR (acrylonitrile butadiene rubber).
Do not vulcanize with sulfur, but NBR
Organic peroxide 20 such as dicumyl peroxide
The rubber material is vulcanized. Then, this rubber material is added in advance in a ratio (mixing ratio) of, for example, 0.8 to 2.4 parts by weight, preferably 1.2 to 2 parts by weight of the organic peroxide 20 to 100 parts by weight of NBR. It is formed by doing.

In this case, as the organic peroxide 20, for example, Parkmill D (dicumyl peroxide) or Parkmill D-40, which is a trade name of NOF Corporation
(Park Mill D diluted to about 40% with an inert filler or the like).

In determining the compounding ratio of the organic peroxide 20 to NBR, the relationship between these compounding ratios and the tensile strength of the vibration isolating member 19 is shown as a characteristic line L1 in FIG. Become. Here, the characteristic line L2 in FIG.
1 shows the average tensile strength of a rubber material of the prior art formed by vulcanizing BR with sulfur.

Then, as can be seen from FIG.
When the compounding ratio of the organic peroxide 20 is less than 0.8, and when the compounding ratio is more than 2.4,
The tensile strength of the vibration isolator 19 is reduced compared to the prior art rubber material.

On the other hand, when the compounding ratio of the organic peroxide 20 is set in the range of 0.8 to 2.4, the tensile strength of the vibration damping member 19 is increased as compared with the conventional rubber material. In particular, when the compounding ratio is in the range of 1.2 to 2 parts by weight, the tensile strength of the vibration isolating member 19 can be greatly improved. Therefore, by adding the organic peroxide 20 at the compounding ratio according to the present embodiment, the vibration damping member 1
9 can secure sufficient strength and durability.

A first valve 21 is provided between the discharge port 11B of the fuel pump 11 and the inflow chamber 16 of the fuel filter 12.
The first seal member 21 is formed of a rubber material in which an organic peroxide 20 such as dicumyl peroxide is previously added to NBR, for example, in substantially the same manner as the vibration isolating member 19. . The seal member 21 has a substantially cylindrical shape, and its inner peripheral side is the discharge port 11 of the fuel pump 11.
B, and its outer peripheral side is a filter case 6
(Fuel passage 9) is fitted to connection port 9A. Thereby, the seal member 21 is connected to the discharge port 11 of the fuel pump 11.
B is liquid-tightly sealed with respect to the filter case 6 to prevent fuel discharged from the discharge port 11B from leaking into the tank 1.

Reference numerals 22 and 22 denote two seal rings provided as a second seal member provided inside the fuel filter 12. Each of the seal rings 22 is formed of a rubber material substantially similar to the vibration damping member 19. , Are provided between the mounting rings 14 and 15 of the fuel filter 12 and the outer cylindrical portion 6 </ b> B of the filter case 6.

The seal ring 22 seals the space between the inflow chamber 16 and the outflow chamber 17 of the fuel filter 12, and the fuel in the inflow chamber 16 leaks to the outflow chamber 17 without passing through the filter element 13. It is what prevents.

A reference numeral 23 shown in FIG. 1 is a fuel return pipe provided on the flat plate portion 3A of the upper bracket 3, and the return pipe 23 is provided downstream of the fuel injection valve of the engine by eliminating the pressure regulator 18, for example. This is used when a so-called full-return type fuel supply system is configured by providing another pressure regulator on the side, and in this full-return type fuel supply system, the pressure disposed outside the fuel tank 1 is set. Excess fuel flowing out of the regulator is returned into the fuel tank 1.

The fuel supply device according to the present embodiment has the above-described configuration, and its operation will be described next.

First, during operation of the fuel supply device, when the fuel pump 11 is operated by being supplied with power through the connector 5 or the like, the fuel in the tank 1 is supplied through the suction filter 11C by the suction port 11A of the fuel pump 11 through the suction filter 11C. Inhaled,
This fuel is discharged from the discharge port 11B to the fuel passage 9 of the filter case 6 as shown by an arrow A in FIG.

Then, the fuel flows into the inflow chamber 16 of the fuel filter 12 through the fuel passage 9, is filtered by the filter element 13 as shown by arrow B, and flows out into the outflow chamber 17, as shown by arrow C. The fuel flows out from the fuel outlet 6F of the filter case 6 toward the supply pipe 4 of the upper bracket 3 and is connected to the supply pipe 4 outside the fuel tank 1 via a pipe (not shown) or the like. Supplied to

At this time, a part of the fuel flowing through the outflow chamber 17 flows into the inside from the inlet 18A of the pressure regulator 18, and surplus fuel of the fuel is returned to the return port as shown by arrow D. The fuel is returned from the fuel tank 1 from the fuel tank 1 through the outlet pipe 18C.

Thus, in the present embodiment, the vibration damping member 19, the seal member 21, and the seal ring 22 of the fuel supply device are vulcanized by using an organic peroxide 20 such as dicumyl peroxide for NBR. These rubber materials are made of, for example, NBR of 100.
The composition is such that the organic peroxide 20 is added in a mixing ratio of 0.8 to 2.4 parts by weight, preferably 1.2 to 2 parts by weight with respect to parts by weight.

Thus, the vibration isolating member 19 and the sealing member 2
The rubber material used as the seal ring 1 and the seal ring 22 can be imparted with sufficient strength by vulcanization using an organic peroxide 20 and can be compared with a rubber material vulcanized with sulfur or the like as in the prior art. As a result, the durability of the rubber material can be increased and its life can be extended.

Accordingly, the fuel pump 1 is controlled by the vibration isolating member 19.
1 can be reliably protected from vehicle vibration and the like. Further, the discharge port 1 of the fuel pump 11 is
1B can be sealed, the seal ring 22 can seal between the inflow chamber 16 and the outflow chamber 17 of the fuel filter 12, and their vibration-proof performance and sealing performance can be stably maintained over a long period of time. .

Even when the vibration isolating member 19, the sealing member 21, and the sealing ring 22 are used for a long period of time, the sulfur component and the like do not elute from the rubber material into the fuel in the tank 1. In addition, it is possible to prevent the connection of the fuel pump 11 from being poorly connected due to the sulfur component adhering to the power supply terminal or the like of the fuel pump 11, and to improve the reliability of the fuel supply device.

As a result, only by using the organic peroxide 20 as the vulcanizing agent for the rubber material, the vibration damping member 19, the sealing member 21 and the sealing ring 22 having high chemical stability in the fuel can be formed at low cost. For example, it is not necessary to use an expensive rubber material such as fluorine rubber, and the cost can be reduced.

Next, FIGS. 6 and 7 show a second embodiment according to the present invention.
This embodiment is characterized in that an organic peroxide and an antioxidant are added to NBR.

Here, in the present embodiment, an example in which an anti-aging agent is added to the vibration isolating member among the vibration isolating member and the first and second seal members will be described. Note that, in the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

Reference numeral 31 denotes a vibration isolating member used in place of the vibration isolating member 19 of the first embodiment. The vibration isolating member 31 is substantially the same as that of the first embodiment, for example, dicumyl peroxide is added to NBR. And the like, and is formed of a rubber material to which an organic peroxide 20 is added in advance.

An antioxidant 32 of, for example, an aldehyde / ketone / amine type or an imidazole type is added to the vibration isolating member 31 in advance at a mixing ratio of 0.5 to 2 parts by weight with respect to 100 parts by weight of NBR. The anti-aging agent 32
Is to prevent the rubber material constituting the vibration isolating member 31 from aging (deteriorating) due to the passage of time, temperature change, or the like, and to increase the durability of the vibration isolating member 31.

FIG. 7 shows the relationship between the compounding ratio of the antioxidant 32 to the NBR and the aging resistance of the vibration isolating member 31 when determining the compounding ratio. Here, the vertical axis in FIG. 7 indicates the tensile strength of the vibration isolating member 31 before and after this test when a predetermined aging test by heating or the like is performed on the rubber material of the vibration isolating member 31. The rate of change is shown. That is, for example, the change rate is -15%
In the case of, the tensile strength after the aging test was reduced by 15% from the initial state before the test, indicating that the aging of the rubber material was advanced.

Then, as can be seen from FIG.
When the compounding ratio of the anti-aging agent 32 is smaller than 0.5, and when the compounding ratio is larger than 2, the tensile strength of the vibration isolating member 31 is significantly reduced after the aging test.
It becomes difficult to maintain the durability for a long period of time.

On the other hand, when the compounding ratio of the antioxidant 32 is set in the range of 0.5 to 2, the decrease in the tensile strength of the vibration isolating member 31 due to the aging test is stably suppressed. Since it is possible, the anti-aging agent 3 in the compounding ratio according to the present embodiment
By adding 2, the aging of the vibration isolating member 31 can be reliably prevented from progressing early, and the strength and durability thereof can be further improved.

Thus, also in the present embodiment configured as described above, it is possible to obtain substantially the same operation and effect as in the first embodiment. And especially in this embodiment,
Since the anti-aging agent 32 is added to the vibration isolating member 31, the life can be extended and the reliability can be increased.

In this embodiment, the vibration isolating member, the first
And the anti-aging agent is added to the vibration isolating member 31 of the second sealing member, but the anti-aging agent is added to the sealing member 21 or the sealing ring 22 serving as the first and second sealing members. Is also good.

Next, FIGS. 8 and 9 show a third embodiment according to the present invention.
This embodiment is characterized in that an organic peroxide and an acid acceptor are added to NBR.

Here, in the present embodiment, a case where an acid acceptor is added to the vibration isolating member of the first and second sealing members will be described as an example. Note that, in the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

Reference numeral 41 denotes a vibration isolating member used in place of the vibration isolating member 19 of the first embodiment. The vibration isolating member 41 is substantially the same as that of the first embodiment, for example, dicumyl peroxide is added to NBR. And the like, and is formed of a rubber material to which an organic peroxide 20 is added in advance.

The anti-vibration member 41 is provided with an acid acceptor 42 made of a metal oxide such as magnesium oxide, zinc oxide, calcium carbonate, etc., in an amount of 2 to 100 parts by weight of NBR.
It is added in a ratio of 10 parts by weight in advance. In this case, the acid acceptor 42 is composed of the excess organic peroxide 2 remaining in the NBR.
0 is deoxygenated, and the excess organic peroxide 20 prevents the crosslinking of the NBR from progressing even after the vibration isolator 41 is manufactured, thereby preventing the vibration isolator 41 from being excessively hardened. .

In determining the mixing ratio of the acid receiving agent 42 to NBR, these mixing ratios and the vibration isolating member 41
FIG. 9 shows the relationship with the flexibility. Here, the vertical axis in FIG. 9 indicates the rate of change in the amount of elongation of the vibration isolating member 41 before and after this test when a predetermined aging test is performed on the rubber material of the vibration isolating member 41. . That is, for example, when the rate of change becomes -25%, the rubber material after the aging test becomes harder to elongate and deform by 25% than the initial state before the test, indicating that the rubber material is cured. It is.

Then, as can be seen from FIG.
When the compounding ratio of the acid acceptor 42 to the mixture is smaller than 2, and when the compounding ratio is larger than 10, the vibration isolating member 41
May be excessively cured and the performance may be reduced.

On the other hand, the mixing ratio of the acid acceptor 42 is 2 to 1
When set within the range of 0, excessive hardening of the vibration isolating member 41 can be suppressed as much as possible. Therefore, by adding the acid acceptor 42 at the compounding ratio according to the present embodiment, the organic peroxide 20 The NBR is moderately advanced, so that the strength of the vibration isolating member 41 can be sufficiently maintained, and its flexibility can be stably maintained over a long period of time. Can be kept good.

Thus, in the present embodiment configured as described above, substantially the same operation and effect as in the first embodiment can be obtained. And especially in this embodiment,
Since the acid absorbing agent 42 is added to the vibration isolating member 41,
Its performance can be further enhanced.

In this embodiment, the anti-vibration member, the first
And the second seal member is configured such that an acid acceptor is added to the vibration isolating member 41, but the first and second seal members are configured to add the acid acceptor to the seal member 21 or the seal ring 22. Is also good.

Next, FIG. 10 shows a fourth embodiment according to the present invention. The feature of this embodiment is that a fuel pump is applied to a fuel supply device arranged outside a fuel filter. is there. Note that, in the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

Reference numeral 51 denotes a mounting bracket mounted on the mounting hole 1C of the fuel tank 1. The mounting bracket 51 is integrally formed of, for example, a resin material, and has a flat plate portion 51A for closing the mounting hole 1C and a flat plate portion 51A. From fuel tank 1
, A pump mounting portion 51B having an L-shaped cross section which is suspended in the tank 1 through the mounting hole 1C, a cylindrical filter mounting portion 51C extending from the flat plate portion 51A into the fuel tank 1, and a filter mounting portion 51C. And a recessed portion 51D formed on the inner peripheral side.

Here, on the upper surface side of the flat plate portion 51A, a substantially L-shaped supply pipe 52 for supplying the fuel in the fuel tank 1 to the outside, a return pipe 65 and a suction pipe 66 described later,
A connector (not shown) for the fuel pump 54 is provided, and a fuel passage 53 described later is provided inside the flat plate portion 51A. The mounting bracket 51 supports a fuel pump 54, a fuel filter 55, and the like, which will be described later, in a state of being immersed in the fuel in the tank 1.

Reference numeral 53 denotes a fuel passage provided inside the mounting bracket 51. The fuel passage 53 has a discharge port 54B of a fuel pump 54 and an inflow chamber 59 of a fuel filter 55 which will be described later.
A substantially U-shaped upstream passage portion 53A connecting between the first and second sides,
The inside of the recess 51D of the mounting bracket 51 and the supply pipe 52
And a downstream passage portion 53 </ b> B communicating with the outflow chamber 60 side of the fuel filter 55. In the fuel passage 53, the fuel discharged from the discharge port 54 </ b> B of the fuel pump 54 flows toward the outside of the fuel tank 1.

Reference numeral 54 denotes an electric fuel pump mounted on the pump mounting portion 51B of the mounting bracket 51 at a position distant from the fuel filter 55. The fuel pump 54 has a suction port substantially in the same manner as in the first embodiment. Port 54A, discharge port 54
B, a suction filter 54C, etc.
Are supported from below through a vibration isolating member 61 described later. The discharge port 54B is connected to an upstream passage 53A of the fuel passage 53 via a seal member 62 described later.

Reference numeral 55 denotes a fuel filter for filtering the fuel discharged from the fuel pump 54. The fuel filter 55 includes an upstream passage 53A and a downstream passage 53B of the fuel passage 53.
And is provided on the filter mounting portion 51C of the mounting bracket 51. Then, the fuel filter 55
Is mounted on the lower side of the filter mounting portion 51C, and is provided between the filter mounting portion 51C of the mounting bracket 51 and the filter element 56. It comprises a filter cover 57 having a bottom cylindrical shape, and a mounting ring 58 for mounting the upper side of the filter element 56 in the recess 51D of the mounting bracket 51. The filter element 56 defines the inside of the filter mounting portion 51C into an inflow chamber 59 on the outer peripheral side and an outflow chamber 60 on the inner peripheral side.

Reference numeral 61 denotes a vibration damping member provided between the pump mounting portion 51B of the mounting bracket 51 and the fuel pump 54. The vibration damping member 61 is, for example, an NBR, similar to the first embodiment. A vulcanization treatment was performed by adding 0.8 to 2.4 parts by weight, preferably 1.2 to 2 parts by weight, of an organic peroxide 20 such as dicumyl peroxide to 100 parts by weight. It is made of rubber material. The vibration isolating member 61 protects the fuel pump 54 from vibration of the vehicle and the like, and also controls the suction port 5 of the fuel pump 54.
This seals a connection portion between 4A and the suction filter 54C.

Reference numeral 62 denotes a first seal member provided on the discharge side of the fuel pump 54. The first seal member 62 is formed of substantially the same rubber material as the vibration damping member 61. The outlet 54B is liquid-tightly sealed to the mounting bracket 51.

A seal ring 63 is provided between the outflow chamber 60 of the fuel filter 55 and the downstream passage 53B of the fuel passage 53 as a second seal member. And is disposed between the recess 51D of the mounting bracket 51 and the mounting ring 58 of the fuel filter 55.
The space between the inflow chamber 59 and the outflow chamber 60 is sealed.

Reference numeral 64 denotes a third filter provided on the fuel filter 55.
The seal ring 64 is made of the same rubber material as the seal member 61, and seals between the filter mounting portion 51C of the mounting bracket 51 and the filter cover 57.

On the other hand, reference numeral 65 denotes a fuel return pipe provided on the mounting bracket 51, and the return pipe 23 is located outside the fuel tank 1 and is provided with a pressure regulator (not shown) provided downstream of the fuel injection valve. The surplus fuel flowing out of the fuel tank 1 is returned into the fuel tank 1. Reference numeral 66 denotes a fuel suction pipe provided on the mounting bracket 51. The suction pipe 66 is used corresponding to, for example, a saddle-shaped fuel tank (not shown) having a main tank and a sub tank. That is, when the suction pump 67 is operated, the fuel in the sub tank is sucked into the main tank.

Thus, in the present embodiment having the above-described structure, substantially the same operation and effect as those of the first embodiment can be obtained. And especially in this embodiment,
The seal ring 64 to which the organic peroxide 20 has been added can stably seal between the mounting bracket 51 and the filter cover 57.

Next, FIG. 11 shows a fifth embodiment of the present invention. The feature of this embodiment is that the present invention is applied to a separate fuel supply device in which a fuel filter is disposed outside a tank. It is in. In this embodiment, the same components as those in the first embodiment are denoted by the same reference numerals,
The description is omitted.

Reference numeral 71 denotes a mounting bracket mounted on the mounting hole 1C of the fuel tank 1. The mounting bracket 71 is integrally formed of, for example, a resin material, and has a flat plate portion 71A for closing the mounting hole 1C, and a flat plate portion 71A. From fuel tank 1
And a pump mounting portion 71B having an L-shaped cross section suspended therein.

A substantially L-shaped supply pipe 72 for supplying the fuel in the fuel tank 1 to the outside is provided on the flat plate portion 71A.
A connector 73 for a fuel pump 75 described later is provided. The upper side of the supply pipe 72 is connected to a fuel injection valve of the engine via a pipe or the like, and a fuel filter (both not shown) is provided in the middle of the pipe.

The lower side of the supply pipe 72 projects into the fuel tank 1 and is connected to a discharge port 75B of a fuel pump 75 via a rubber pipe 77 described later. The inside of the supply pipe 72 is a fuel passage 74 through which fuel discharged from the fuel pump 75 flows toward the outside of the tank 1.

Reference numeral 75 denotes an electric fuel pump mounted on the pump mounting portion 71B of the mounting bracket 71. The fuel pump 75 is substantially the same as the first embodiment.
5A, a discharge port 75B, a suction filter 75C, and the like.

Reference numeral 76 denotes the pump mounting portion 71B and the fuel pump 1
1. The vibration isolating member 76 is provided between
For example, it is formed of a rubber material obtained by adding an organic peroxide 20 to NBR, and prevents transmission of vibration to the fuel pump 75.

Reference numeral 77 denotes a rubber pipe formed as a flexible tubular body. The rubber pipe 77 is made of, for example, a rubber material obtained by adding organic peroxide 20 to NBR, and is formed by using a metal retaining ring 78 or the like. Supply pipe 7 for mounting bracket 71
2 and a discharge port 75 </ b> B of the fuel pump 75.

The rubber pipe 77 is connected to the fuel pump 7
5 is connected between the discharge port 75B and the fuel passage 74 to seal the space therebetween and to prevent vibration of the fuel pump 75 in cooperation with the vibration isolating member 76.

Thus, in the present embodiment configured as described above, substantially the same operation and effect as in the first embodiment can be obtained. And especially in this embodiment,
The rubber pipe 77 to which the organic peroxide 20 is added can stably connect the fuel passage 74 of the mounting bracket 71 and the discharge port 75B of the fuel pump 75.

In the first embodiment, the vibration isolator 19, the seal member 21, and the seal ring 22 are
The BR is made of a rubber material that has been vulcanized with an organic peroxide 20. However, the present invention is not limited to this, and the rubber material is used for any one or two of these members. The remaining members may be made of the same rubber material as in the prior art, which has been vulcanized with sulfur or the like.

In the fifth embodiment, the rubber pipe 77 to which the organic peroxide 20 is added is used. However, the present invention is not limited to this. An antioxidant or an acid acceptor may be added together with the peroxide 20.

[0100]

As described above in detail, according to the first aspect of the present invention, the portion of the fuel tank that comes into contact with the fuel is provided with the NBR.
To 100 parts by weight of an organic peroxide in the range of 0.8 to 2.4.
Since the rubber material formed by adding the rubber material in the ratio of parts by weight is used, sufficient strength can be imparted to the rubber material by vulcanization treatment using an organic peroxide, and the sulfur material is reduced as in the prior art. The durability of the rubber material can be increased and its life can be prolonged, as compared with a rubber material subjected to a vulcanization treatment such as that described above. Therefore, for example, various parts such as a vibration isolating member, a sealing member, and a pipe member used for each part in the fuel tank can be formed at low cost by using this rubber material, and the performance of these parts is stably maintained for a long period of time. be able to. In addition, it is possible to prevent a fuel pump or the like from being connected poorly due to elution of a sulfur component from the rubber material into the fuel in the tank, thereby improving reliability. Also,
For example, it is not necessary to use an expensive rubber material such as fluororubber, and the cost can be reduced.

According to the second aspect of the present invention, since the vibration damping member made of the rubber material is provided between the fuel pump and the bracket, the vibration damping member containing no sulfur component can be manufactured at a low cost. The vibration damping member can stably prevent external vibrations and the like from being transmitted from the bracket to the fuel pump over a long period of time. Further, it is possible to prevent the fuel pump or the like from being connected poorly due to the elution of the sulfur component from the vibration isolating member into the fuel in the tank, thereby improving the reliability.

According to the third aspect of the present invention, the rubber material is formed between the discharge port of the fuel pump and the inflow side of the fuel filter, or between the outflow side of the fuel filter and the fuel passage. Since the seal member is provided, the seal member for sealing the space between the fuel pump, the fuel filter, the fuel passage, and the like can be formed at low cost by a rubber material that has been vulcanized with an organic peroxide. The sealing performance can be stably maintained for a long period of time, and the connection failure of the fuel pump due to the sulfur component in the rubber material can be prevented to improve the reliability.

According to the fourth aspect of the present invention, the seal between the inflow side and the outflow side of the fuel filter is sealed by the seal member formed of the rubber material. The sulfuric acid-treated seal member can stably seal between the inflow side and the outflow side of the fuel filter for a long period of time. The sulfur component elutes from the seal member into the fuel in the tank, and the fuel pump And the like can be prevented from becoming a connection failure, and the reliability can be improved.

According to the fifth aspect of the present invention, the rubber material contains 0.1 parts by weight of NBR and 0.1 parts by weight of an aldehyde-ketone-amine-based or imidazole-based antioxidant.
Since the composition is formed by adding at a ratio of 5 to 2 parts by weight, the anti-aging agent can prevent the rubber material from aging due to the passage of time, temperature change, and the like, such as strength and elasticity,
By setting the mixing ratio to the predetermined ratio, the durability of the rubber material can be stably increased.

According to the sixth aspect of the present invention, the rubber material is formed by adding an acid acceptor composed of a metal oxide at a ratio of 2 to 10 parts by weight with respect to 100 parts by weight of NBR. Therefore, the acid acceptor can prevent the rubber material from being excessively hardened by the excess organic peroxide remaining in the NBR, and by setting the compounding ratio to the predetermined ratio, the strength of the rubber material can be reduced. And the flexibility can be maintained over a long period of time.

[Brief description of the drawings]

FIG. 1 is a front view showing a fuel supply device according to a first embodiment of the present invention.

FIG. 2 is a plan view showing a fuel supply device according to the first embodiment of the present invention.

FIG. 3 is a longitudinal sectional view of the filter case as viewed from a direction indicated by arrows III-III in FIG. 2;

FIG. 4 is an enlarged sectional view of a main part in FIG. 3, showing a vibration isolating member in an enlarged manner.

FIG. 5 is a characteristic diagram showing a relationship between a compounding ratio of an organic peroxide to NBR and a tensile strength of a vibration damping member.

FIG. 6 is an enlarged sectional view of a main part showing a part of a fuel supply device according to a second embodiment of the present invention.

FIG. 7 is a characteristic diagram showing a relationship between a compounding ratio of an antioxidant to NBR and a rate of change in tensile strength of a vibration damping member before and after an aging test.

FIG. 8 is an enlarged sectional view of a main part showing a part of a fuel supply device according to a third embodiment of the present invention.

FIG. 9 is a characteristic diagram showing a relationship between a compounding ratio of an acid acceptor to NBR and an elongation change rate of a vibration isolator before and after an aging test.

FIG. 10 is a longitudinal sectional view showing a fuel supply device according to a fourth embodiment of the present invention.

FIG. 11 is a longitudinal sectional view showing a fuel supply device according to a fifth embodiment of the present invention.

[Description of Signs] 1 Fuel tank 2, 51, 71 Mounting bracket (bracket) 3 Upper bracket 3A, 51A, 71A Flat plate 3B Tubular 4, 52, 72 Supply pipe 4A Connection 5, 73 Connector 6 Filter case 6A Cylinder 6B Outer cylinder 6C Bottom 6D Lid 6E Passage 6F Fuel outlet 6G Regulator fitting cylinder 7 Pump accommodating space 8 Filter accommodating space 9, 53, 74 Fuel passage 9A Connection port 10 Lower bracket 11, 54, 75 Fuel pump 11A, 54A, 75A Suction port 11B, 54B, 75B Discharge port 11C, 54C, 75C Suction filter 12, 55 Fuel filter 13, 56 Filter element 14, 15, 58 Mounting ring 16, 59 Inflow chamber 17, 60 Outflow chamber 18 Pressure regulator 19,31,41,61,76 Vibration member 20 Organic peroxide 21, 62 Seal member 22, 63, 64 Seal ring (seal member) 32 Antioxidant 42 Acid acceptor 51B, 71B Pump mounting part 53A Upstream passage 53B Downstream passage 57 Filter cover 77 rubber pipe

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Masaaki Iijima 1370 Onna, Atsugi-shi, Kanagawa Prefecture Inside Unisia Gex Co., Ltd. 72) Inventor Kazuo Izumi 1370 Onna, Atsugi-shi, Kanagawa Prefecture Inside Unisia Gex Co., Ltd. (72) Inventor Masahisa Mitani 5-2 Minamisakaemachi, Kasukabe-shi, Saitama F-term in Mitoyo Technical Center Co., Ltd. 3D038 CA06 CA15 CB01 CC06 CC07 CC19

Claims (6)

[Claims] A fuel tank containing fuel therein; a fuel pump housed in the fuel tank for discharging the fuel to the outside of the fuel tank; and a fuel tank for discharging the fuel discharged from the fuel pump to the fuel tank. In a fuel supply device provided with a fuel passage which circulates toward the outside of the fuel tank, a portion of the fuel tank which comes into contact with the fuel is 100 parts by weight of NBR and 0.8 to 2 parts by weight of an organic peroxide. A fuel supply device characterized by using a rubber material formed by adding at a ratio of 4 parts by weight. 2. The fuel tank according to claim 1, wherein a bracket for supporting the fuel pump is provided on the fuel tank, and a vibration isolator made of the rubber material is provided between the fuel pump and the bracket. Fuel supply device. 3. A fuel filter is provided in the fuel passage for filtering and flowing out fuel flowing from a discharge port of the fuel pump, between a discharge port of the fuel pump and an inflow side of the fuel filter, or 3. The fuel supply device according to claim 1, wherein a seal member made of the rubber material is provided between an outflow side of the fuel filter and the fuel passage. 4. Inside the fuel filter, a seal is formed between a fuel formed from the rubber material and discharged from a discharge port of the fuel pump and fuel filtered by a filter element of the fuel filter. The fuel supply device according to claim 3, further comprising a seal member. 5. The rubber material is formed by adding an aldehyde / ketone / amine-based or imidazole-based antioxidant in a ratio of 0.5 to 2 parts by weight to 100 parts by weight of NBR. The fuel supply device according to claim 1, 2, 3, or 4. 6. The rubber material according to claim 1, wherein the rubber material is formed by adding an acid acceptor composed of a metal oxide at a ratio of 2 to 10 parts by weight to 100 parts by weight of NBR.
6. The fuel supply device according to 3, 4, or 5.