JPH06264709A - Fuel level measuring device for internal combustion engine - Google Patents

Abstract

PURPOSE:To secure sufficient sealing property and reduce fuel level fluctuation at the time of fuel level insertion. CONSTITUTION:The upper end portion of a fuel gauge guide 12 is formed in a step shape with larger diameters in the upper part while lip diameters of a seal portion 16 are made larger in the upper part and lips 16a, 16b, 16c are fitted in the fuel level gauge of different diameter cylindric portions 12a, 12b, 12c, respectively. Thus, because air can be let loose until the lowest lip 16a is fitted into the smallest diameter cylindric portion 12a, fuel level fluctuation inside the fuel level gauge guide 12 can be lessened when the fuel level gauge is inserted and, furthermore, sufficient sealing property can be secured because all lips can be given sealing function.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil level measuring device for an internal combustion engine.

[0002]

2. Description of the Related Art As a device for measuring the amount of lubricating oil of an internal combustion engine, conventionally, as shown in FIGS. 2 and 3, a cylindrical level gauge guide 6 communicating with an oil reservoir portion 4 of an oil pan 2 is provided.
The oil level gauge 8 is inserted so that the oil level gauge does not come out of the level gauge guide or the oil does not leak due to vibrations received while the vehicle is running.
It is known that a level gauge guide is attached and fitted to the upper end portion of the level gauge guide.

However, when the oil level gauge is inserted into the gauge guide, the lowermost lip 1 of the equal-diameter lips 10a, 10b, 10c of the seal portion 10 is provided.
The air in the level gauge guide is pushed down by the insertion stroke of the oil level gauge (A in Fig. 3) after 0a is fitted to the inner diameter of the level gauge guide, and the oil level in the level gauge guide is also lowered by that much. , It may not be possible to accurately measure the oil level.

In order to prevent this, the actual development of Sho 61-82
No. 225, the level gauge guide portion (the portion B in FIG. 3) corresponding to between the lowermost lip of the seal portion and the second lip from the bottom when the oil level gauge is fully inserted into the level gauge guide. ) Has been proposed with a small hole. By providing this small hole, the air pushing stroke is reduced to the distance from the small hole to the lowermost lip (C in FIG. 3), and the accuracy of oil level measurement is improved.

[0005]

However, in the prior art, by providing a small hole, the seal between the oil level gauge and the level gauge guide is a single seal consisting of the lowermost lip, so that a plurality of lips are provided. There is a problem that the effect of increasing the sealing function by providing a step is lost.

An object of the present invention is to reduce the pushing down of the oil level in the level gauge guide at the time of inserting the oil level gauge into the level gauge guide, and at the same time, the sealing effect due to the plurality of lips of the seal portion is not impaired. An object of the present invention is to provide an oil level measuring device.

[0007]

The above object can be achieved by the following oil level measuring device for an internal combustion engine according to the present invention. That is, a cylindrical level gauge guide that communicates with the oil reservoir of the oil pan, an oil level gauge inserted into the level gauge guide, and a seal section having a plurality of lips attached to the root of the oil level gauge. In the oil level measuring device for an internal combustion engine, the level gauge guide is formed in a stepped shape into a cylindrical portion having a different diameter with the diameter increasing toward the upper side, and a plurality of lips of the sealing section are disposed above the upper side. An oil level measuring device for an internal combustion engine, which is formed to have a larger diameter, and each of the plurality of lips is fitted into an inner diameter surface of a corresponding diameter of the different diameter cylindrical portion.

[0008]

In the above-mentioned device of the present invention, when the oil level gauge is inserted into the level gauge guide, the oil of the level gauge guide is kept until the lowermost lip reaches the different diameter cylindrical portion of the smallest inner diameter corresponding to the diameter. The space above the surface is not confined, and the pushing down of air does not begin. Therefore, the effective stroke of pushing down the air in the level gauge guide is from the distance (A in FIG. 3) from the upper end of the conventional level gauge guide to the lowermost lip position to the lowermost lip position from the upper end of the different-diameter cylindrical portion with the smallest inner diameter. It is reduced to the distance. As a result, the accuracy of oil level measurement is improved. In addition, since there are no air escape small holes and all lips work effectively for sealing, a multiple seal is obtained, and the oil seal function is increased compared to the case where the air escape small holes are provided.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, an oil level measuring device for an internal combustion engine according to a preferred embodiment of the present invention comprises a cylindrical level gauge guide 12 which communicates with an oil sump portion (according to FIG. 2) of an oil pan. An oil level gauge 14 inserted into the level gauge guide 12 and a seal portion 16 attached to the root of the oil level gauge 14. The seal portion is made of an elastic body, and has a plurality of, in the illustrated example, three, radially outwardly protruding lips 16a, 16b, 1b.
6c.

The upper end of the level gauge guide 12 is formed in a stepped shape, and is formed in a different diameter cylindrical portion having a larger diameter toward the upper side. That is, the different-diameter cylindrical portion has cylindrical portions 12a, 12b, and 12c having different diameters, and the upper cylindrical portion has a larger diameter. Cylindrical parts 12a, 12
b and 12c are connected by step surfaces 12d and 12e, and the step surfaces 12d and 12e are orthogonal to the level gauge guide axis.

A plurality of lips 16a, 16 of the seal portion 16
b and 16c have different diameters, and the upper lip has a larger diameter. The outer diameter of the lip 16a is slightly larger than the inner diameter of the cylindrical portion 12a in the free state, the outer diameter of the lip 16b is slightly larger than the inner diameter of the cylindrical portion 12b in the free state, and the outer diameter of the lip 16c is the inner diameter of the cylindrical portion 12c in the free state. It is set slightly larger. When the oil level gauge 14 and the seal portion 16 are inserted into the level gauge guide 12, the lip 16a fits on the inner diameter surface of the cylindrical portion 12a, the lip 16b fits on the inner diameter surface of the cylindrical portion 12b, and the lip 16c. Fits on the inner diameter surface of the cylindrical portion 12c. This fit is liquid tight.

Next, the operation will be described. When measuring the nozzle level, pull out the oil level gauge 14 from the level gauge guide 12 to remove the oil level gauge 14
Determine the oil level by observing the wet surface. After the measurement, the oil level gauge 14 is inserted into the level gauge guide 12 until the flange of the handle hits the upper end of the level gauge guide 12. The vehicle travels with the oil level gauge 14 still inserted in the level gauge guide 12.

When the oil level gauge 14 is inserted into the level gauge guide 12, until the lip 16a at the lowermost end of the seal portion 16 reaches the upper end position of the minimum diameter cylindrical portion 12a of the different diameter cylindrical portion of the level gauge guide 12. The air in the space above the oil surface in the level gauge guide 12 is not trapped and can freely escape upward. When the lowermost lip 16a comes to the upper end of the smallest diameter cylindrical portion 12a,
Therefore, the air between the oil surface and the upper end of the small diameter cylindrical portion 12a is trapped, and the oil surface in the level gauge guide 12 is pushed down by the amount that the lowermost lip 16a strokes downward from that position (A 'in FIG. 1). . However, the amount A'is significantly smaller than the conventional amount of pushing down the distance A from the upper end to the lowermost lip of the level gauge guide of FIG. Therefore, after inserting the oil level gauge,
The amount of fluctuation from the true level of the oil surface is small, and the measurement accuracy of the oil level is much higher than in the past.

Further, the lips 16a, 16b, 16c are fitted to the inner diameter surfaces of the cylindrical portions 12a, 12b, 12c, respectively, and a multiple, in this embodiment, triple seal is obtained, and the sealing property is sufficient. In addition, a fitting force is obtained at each of the seal portions, and the oil level gauge 14 is prevented from coming off from the level gauge guide 12 due to vibration while the vehicle is traveling.

Further, the insertion length of the oil level gauge accompanied by the insertion load becomes short (reduced from A to A '), so that the oil level gauge 14 can be easily inserted. Further, when the oil level gauge is pulled out, the oil around the lip falls into the level gauge guide due to the difference between the lip diameter and the inner diameter of the level gauge guide, so that oil spilling to the outside is reduced.

[0016]

According to the present invention, the upper end of the level gauge guide is formed in a stepped shape such that the upper side has a larger diameter, and the lip of the seal portion is formed with a larger diameter toward the upper side, so that the lip is provided on the level gauge guide. Since it is fitted to the oil level gauge, the fluctuation of the oil level inside the level gauge guide at the time of inserting the oil level gauge can be reduced, the accuracy of oil level measurement can be improved, and all lips can have a sealing function. The sealing property can be secured.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of an oil level measuring device for an internal combustion engine according to an embodiment of the present invention.

FIG. 2 is a schematic sectional view of a conventional oil level measuring device for an internal combustion engine.

3 is a partial cross-sectional view of the device of FIG.

[Explanation of symbols]

 12 Level gauge guide 12a Minimum diameter cylindrical part 14 Oil level gauge 16 Seal part 16a Bottom lip

Claims (1)

[Claims] 1. A tubular level gauge guide communicating with an oil reservoir of an oil pan, an oil level gauge inserted into the level gauge guide, and a plurality of lips attached to a root portion of the oil level gauge. In an oil level measuring device for an internal combustion engine, comprising: a seal portion having; a level gauge guide having a stepped upper end portion formed into a different diameter cylindrical portion having a larger diameter toward the upper side, and a plurality of seal portions An oil level measuring device for an internal combustion engine, wherein the lip is formed to have a larger diameter toward the upper side, and the plurality of lips are respectively fitted to inner diameter surfaces of the different diameter cylindrical portions having corresponding diameters.