JPS62149580A - Oil tank for car - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a vehicle oil tank such as a fuel tank or an oil tank used in a motorcycle, for example.

[Conventional technology]

This type of vehicle oil tank needs to maintain the oil level at atmospheric pressure in order to supply fuel oil to the carburetor or lubricating oil to the lubricated parts via the pump.
Conventionally, the inside of a tank is opened to the atmosphere by providing a small through hole in the tank cap or by utilizing a gap between the tank and the tank cap.

[Problem that the invention seeks to solve]

However, with this type of structure, communication paths are formed through holes and gaps, so fuel oil and lubricating oil inside the tank may leak out from the holes or gaps when the vehicle falls over, and water and dust may leak into the tank during a car wash. There was a risk of intrusion.

Therefore, in order to solve this problem, it may be possible to provide a type of valve mechanism in the tank cap, but this would require at least a valve body and a regulating member to restrict the movement of this valve body. , the structure becomes complicated.

[Means for solving problems]

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a vehicle oil tank that has a simple structure and can prevent oil from flowing out from inside the tank and preventing water and dust from entering into the tank. The vehicle oil tank according to the present invention is provided with a gas-permeable and oil-impermeable membrane in the communication path that communicates the inside of the tank with the outside of the tank.

[Effect]

In the present invention, the gas-permeable and oil-impermeable membrane ensures air permeability between the inside and outside of the tank, and also prevents oil, dust, etc. from passing through the communication path.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a partial sectional view showing a first embodiment of a vehicle oil tank according to the present invention, which is implemented as a fuel tank for a motorcycle, and FIG. 2 is an enlarged sectional view of the main parts. In the figure, the reference numeral 1 indicates a fuel tank. This fuel tank 1 is made of a steel plate, and has an upwardly recessed outer panel 1a having a smooth outer surface, and a space for storing fuel oil between the outer panel 1a by closing the lower side of the outer panel 1a. It is formed into a saddle shape that straddles a tank rail (not shown). Reference numeral 2 denotes a concave portion provided approximately at the center of the upper surface of the tank, and an oil filler pipe 3 for supplying fuel oil is provided in this concave portion 2, and a tank cap 5 is placed over this oil filler tube 3.

Reference numeral 6 denotes a through hole drilled in a dead space at the top of the tank that is not filled with gasoline. In this embodiment, this through hole 6 is formed by the tank camp 5 on the top surface of the tank.
It is positioned in front of the fuel tank 1, and forms a continuous path 11 that communicates the portion above the oil level 7 when the fuel tank 1 is full with the outside of the tank.

Reference numeral 8 denotes a plate-shaped gas-permeable and oil-impermeable membrane provided at the upper opening end of the through hole 6, which allows air to pass through but not gasoline. The membrane 8 is made of a material that has high oil resistance, as well as a certain degree of heat resistance and strength, such as polytetrafluoroethylene, nylon, silicone rubber, etc., and allows gasoline particles to pass through it due to its surface tension. Membranes with micropores that cannot be used can be used.

Incidentally, since the surface tension of oil such as gasoline is lower than that of water, the membrane 8 also prevents the permeation of water and dust larger than the fine pores.

9 is a holding plate that covers the membrane 8, and the outer plate 1a is fixed with a bolt 1o.
The peripheral edge of the membrane 8 is fixed onto the outer skin la by being fastened to the outer panel la. Furthermore, a lattice 9a for protecting the membrane 8 is integrally formed in a portion of the holding plate 9 facing above the through hole 6. The size of the through hole 6 is set so that the ventilation resistance of the membrane 8 does not become large and a sufficient amount of ventilation can be obtained.

In the vehicle oil tank constructed in this way, a membrane 8 that allows gas to pass through but does not allow gasoline to pass through is provided at the open end of the through hole 6 that is bored above the gasoline oil level 7. The membrane 8 ensures ventilation between the inside and outside of the fuel tank 1, and the inside of the fuel tank 1 can be maintained at atmospheric pressure. Furthermore, since the membrane 8 does not allow oil or dust to pass through, it is possible to prevent gasoline in the fuel tank 1, dust in the atmosphere, water from car washing, etc. from passing through the through hole 6.

In this way, the present invention provides a membrane in the communication path provided in the fuel tank 1 that allows gas to permeate but does not allow oil to permeate.
Since the purpose is to prevent oil from flowing out while ensuring air permeability, the communication path is not limited to one formed in the tank itself. for example,
A pipe may also be used as shown in the second embodiment shown in FIGS. 3-6. In addition, as shown in the third embodiment shown in FIGS. 7 and 8, it may be provided in the center of the tank cap, or
As shown in the fourth embodiment shown in the figure, it can also be provided on the outer periphery of the tank cap.

FIGS. 3 and 4 are sectional views of essential parts showing the second embodiment, and members equivalent to those shown in FIG. 1 are given the same reference numerals and their explanations will be omitted. In this embodiment, a pipe 11.2 is used to communicate between the inside and outside of the fuel tank 1.
1 is used.

As shown in FIGS. 5 and 6, the pipe 11.21 has insertion parts 11a and 21a that penetrate the bottom plate 1b of the fuel tank 1 and are inserted into the tank, and a protrusion 1 that projects outside the tank.
1b, 21b, and pipe II.

21 to the bottom plate 1b.

21c. The pipe 11 is fixed downwardly below the tip of the bottom plate 1b, and the pipe 21 is fixed vertically to a step slightly behind the tip. Insertion part 11a
, 21a have a length that protrudes above the oil level 7. Furthermore, in order to reduce ventilation resistance, the communication passages on the side of the insertion portions 11a and 21a are made larger in cross-sectional area than those on the side of the protrusions 11b and 2Ib. 8.8
is installed. An annular groove 22 is provided on the inner peripheral surface of the tip of the pipe 21, and the membrane 8 is attached within this annular groove 22 with a retaining ring 23. On the other hand, in the pipe 11, it is adhered with an adhesive to the inner bottom surface of a bottomed cylindrical protection tube 12 inserted into the insertion portion 11a. Reference numeral 13 denotes a small hole drilled in the protective tube I2, which protects the membrane 8 by preventing pressure changes that occur when gasoline in the tank moves suddenly from directly acting on the membrane 8. As a structure for protecting the membrane 8, in addition to the small holes 13, it may be covered with urethane or the like. 15.25 are the protruding parts 11b,
21b.

Note that the mounting position of the pipe is not limited to the front lower side as described above, and may be appropriately selected such as the upper surface of the tank or the rear part of the tank.

Therefore, even in such an embodiment, the inside of the fuel tank 1 can be maintained at atmospheric pressure by the membrane 8, and
Gasoline in the fuel tank 1 can be prevented from flowing out.

FIG. 7 and FIG. 8 are sectional views of main parts showing the third embodiment. In this embodiment, a communication passage is provided in the center of the tank cap 5 using a tank cap 5 that is integrally formed on the upper surface of the fuel tank 1 and is removably attached to the oil filler pipe 3. That is, in the embodiment shown in FIG. 7, a through hole 32 passing through the center of the tank cap 5 forms a communication path from the upper part of the tank to the outside of the tank via the oil filler port. 33 is an annular gasket that seals between the oil supply pipe 3 and the tank cap 5, and a membrane 8 is interposed so as to close the opening of the gasket 33.

Further, in the embodiment shown in FIG. 8, an inner M35 is provided inside the tank cap 5.

The inner lid 35 is formed into a cylindrical shape with a flange, and a through hole 37 is provided in a partition wall 36 that vertically partitions the inside. A gap g is formed between the flange of the inner M35 and the tank cap 5 and between the oil filler pipe 3 and the tank camp 5, and through this gap g, oil flows from the upper part of the tank through the oil filler port and the through hole 37. A communication path to the outside of the tank is formed. A membrane 8 is attached to the upper surface of the partition wall 36 so as to cover the through hole 37.

FIG. 9 is a cross-sectional view of a tank cap showing a fourth embodiment in which a communication passage is provided on the outer circumference of the tank cap provided with a cylinder lock. In this embodiment, the tank cap 5
has a holder 42 inside the lid body 41, and this holder 42
A cylinder lock 43 is held inside. Holder 42
A closing member 44 for closing the oil supply pipe 3 is fitted on the outside, and the lower end is covered with a cover 46 that holds the hook 45 so as to be movable forward and backward. 47 is a spring that always urges the hook 45 to be locked to the oil supply pipe 3; 48 is a closing member 4;
It is a gasket baked on the outer periphery of 4. Reference numeral 49 denotes a communication passage provided vertically in the holder 42, and one end of this communication passage 49 is provided on the upper surface of the holder 42 and is connected to the cylinder lock 4.
3, and the other end is opened into the tank through a communication hole 51 provided in the cover 46. The membrane 8 is fitted into the groove 50 so as to close the upper opening end of the communication hole 51.

Therefore, such a third. In the fourth embodiment, the inside of the fuel tank 1 is maintained at atmospheric pressure by a membrane 8 provided on the tank cap 5, and the gasoline inside the fuel tank 1 is prevented from flowing out.

Incidentally, in each of the above embodiments, an example was explained in which a membrane 8 having a relatively small area was provided, but the present invention is not limited to this. A sectional view of the cap, a plan view similar to Fig. 11,
The area of the membrane can also be increased, as shown in FIG. 12, which is a perspective view of the membrane holding member.

That is, the tank cap 5 shown in this embodiment includes an annular mounting frame 61 and a fluid 62 pivotally connected to the mounting frame 61.
It is composed of etc. Reference numeral 63 denotes a mounting screw for mounting the tank cap 5 to the concave portion 2 of the fuel tank 1;
It passes through the support portion 61a of No. 1. Therefore, the tank cap 5 does not protrude above the fuel tank 1 (
Forms part of the top of the tank.

Reference numeral 64 denotes a holder attached to the inside of the lid 62. The cylinder lock 65 is held inside the holder 64, and a closing member 67 for closing the oil supply pipe 3 is fitted on the outside, and a hook 68 is attached to the lower end. It is covered with a cover 69 that holds it so that it can move forward and backward. The upper end surface of the cylinder lock 65 faces the concave portion 70 in the center of the lid body 62 and has a keyway 71, and the lower end surface is engaged with the hook 68. Reference numeral 72 denotes an opening/closing lid that opens and closes the upper part of the keyway 71.

73 is a spring that always urges the hook 68 to be locked; 74 is a seal baked on the outer peripheral edge of the closing member 67;
Reference numeral 75 denotes a spring that always urges the closing member 67 in the direction of the oil supply pipe 3.

Reference numeral 81 is an air chamber provided within the tank cap 5 between the lid body 62 and the holder 64 by recessing the upper surface of the holder 64. This air chamber 81 has a cylinder lock 65
It is formed in a horseshoe shape in plan view extending so as to surround the air chamber 81 , and the membrane 8 is disposed in this air chamber 81 .
It is divided into the upper chamber 81a and the royal chamber 81b.

Reference numeral 82 denotes a holding member that fits into the air chamber 81 and holds the membrane 8 at a slight inclination so as to become lower in the outer diameter direction.As shown in an enlarged view in FIG.
It has a peripheral wall 82a extending along the wall surface of the air chamber 81. 82b is a reinforcing bridge passed between the peripheral walls 82a. As shown in FIG. 13, which is a cross-sectional view of X1lr-XII[,vjj in FIG. There is. 84 is a half-moon-shaped communication hole opened in the outer peripheral wall 82a slightly above the membrane 8;
Vent the inside and outside and drain water if it accumulates on the membrane 8. 85 and 86 are gaskets that seal the holding member 82.

Reference numeral 87 denotes a through hole passing through the gasket 86 and the bottom surface of the air chamber 81, and this through hole 87 communicates with the inside of the fuel tank 1 through a communication hole 88 provided in the cover 69. Reference numeral 89 denotes a communication hole that passes through the wall surface of the air chamber 81 opposite to the communication hole 84 of the peripheral wall 82a, and communicates with the atmosphere outside the fuel tank 1 through the gap g between the lid body 62 and the mounting frame 61. has been done. That is, the upper chamber 81a is located outside the fuel tank 1, and the upper chamber 81a is located outside the fuel tank l.
1b communicates with the inside of the fuel tank 1.

Therefore, in this embodiment, the membrane 8 has an air chamber 81
Since the area is relatively large, there is no increase in ventilation resistance, and when the motorcycle suddenly starts or stops,
Alternatively, even if the gasoline in the tank moves rapidly during cornering, sufficient ventilation can be obtained.

In this embodiment, the structure for holding the membrane 8 is as shown in FIG. 14, for example, by placing the membrane 8 on a horizontally provided partition wall 91 having a large number of through holes 90... 92 may be pressed from above. Further, as shown in FIG. 15, the membrane 8 may be integrally molded with the holding member.

〔Effect of the invention〕

As explained above, according to the present invention, since the gas-permeable and oil-impermeable membrane is provided in the communication path that communicates the inside of the tank with the outside of the tank, it is possible to communicate between the inside of the tank and the outside of the tank through this membrane. can.

Therefore, the gas-permeable and oil-impermeable membrane ensures air permeability between the inside and outside of the tank, and also prevents oil, dust, etc. from passing through the communication path, so it is possible to prevent oil and dust from passing through the tank with a simple structure. Prevents oil spills and water and dust from entering the tank.

[Brief explanation of drawings]

FIG. 1 is a partial sectional view showing a first embodiment of a vehicle oil tank according to the present invention, which is implemented as a fuel tank for a motorcycle, FIG. 2 is an enlarged sectional view of the main parts, and FIG. Fig. 4 is a sectional view of the main part of a tank showing the second embodiment, Figs. 5 and 6 are sectional views similarly showing the pipe, and Figs. 7 and 8 are tank caps showing the third embodiment. FIG. 9 is a cross-sectional view of a tank cap showing the fourth embodiment.
The figure is a sectional view of a tank camp showing the fifth embodiment.
1 is a plan view, FIG. 12 is a perspective view of the membrane holding member, FIG. 13 is a sectional view taken along the line xm-xnr in FIG. 12, and FIG.
15 and 15 are cross-sectional views of a holding member showing another embodiment for holding a membrane.

Claims (2)

[Claims] (1) An oil tank for a vehicle, which includes a communication path that communicates the inside of the tank with the outside of the tank, and a gas-permeable and oil-impermeable membrane provided in the communication path. (2) The vehicle oil tank according to claim 1, wherein the communication passage is a through hole drilled in a portion of the upper part of the tank that is not filled with oil.