JP3872874B2 - Oil level gauge guide tube structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a guide tube structure of an oil level gauge used for confirming the amount of engine oil in an engine oil pan or the amount of oil in industrial equipment.
[0002]
[Prior art]
The oil level gauge used to check the amount of engine oil in the engine oil pan is inserted into the guide tube 1 communicating with the oil pan 3 as shown in FIG. And the oil amount is confirmed by comparing with the scale which shows the appropriate engine oil amount.
[0003]
There are two types of oil level gauge structures: a flat type and a wire type. When the oil level gauge guide is bent three-dimensionally, a wire type is adopted, but generally a flat type is adopted. Has been.
[0004]
[Problems to be Solved by the Invention]
However, in any type of oil level gauge, when the oil level gauge is inserted into the guide tube and attached, a part of the tip side of the level gauge 2 is attached to the inner surface of the guide tube 1 as shown in FIG. Contact.
Due to this contact, the vibration of the engine 4 propagates to the level gauge 2 through the guide tube 1, and the level gauge 2 vibrates to generate noise due to the vibration of the level gauge 2 itself, and the level gauge 2 and the guide tube 1. There is also a problem that noise is also generated due to a collision with.
[0005]
When a guide tube made of cast aluminum is used, these noises are relatively small due to the characteristics of the material, but there is a problem that the product cost increases.
In addition, when a steel pipe guide tube is used, the cost of the product is reduced, but there is a problem that generated noise increases and an allowable noise level is exceeded.
[0006]
The present invention has been made to solve the above problems, and its purpose is to prevent vibration of the oil level gauge and suppress noise while using a low-cost steel pipe guide tube. It is to provide a guide tube structure for an oil level gauge.
[0007]
[Means for Solving the Problems]
The guide tube structure of the oil level gauge for achieving the above-described purpose is a guide tube body formed of a steel pipe, and a flange fixed to the oil pan on the outer periphery of the lower end of the guide tube body. The upper part of the steel outer cylinder fixed to the inner cylinder is fixed, and the inner cylinder made of steel is inserted into the outer cylinder, and a cushioning material such as rubber is arranged on the entire outer peripheral surface of the inner cylinder, and the A stopper boss is formed by bulging the middle part of the inner cylinder together with the outer cylinder, and when the oil level gauge body is inserted into the guide tube and mounted, a plurality of parts are formed on the oil level gauge body. The guide portion having the refracting portion is configured to contact and support the inner cylinder inner surface at a plurality of points .
[0008]
With this configuration, the vibration of the guide tube can be absorbed and attenuated by the buffer material between the inner tube and the noise from the guide tube can be reduced.
In a state where the oil level gauge is mounted, by the refractive part of the oil level gauge is placed an inner tube so as to contact only the inner surface of the inner tube, the vibration of the tip of the oil level gauge Since it can be held by a small number of inner pipes, the vibration of the oil level gauge can be reduced, and the noise accompanying this vibration can be reduced.
[0009]
Further, the oil level gauge to be mounted is provided with a guide part for preventing the gauge part of the oil level gauge from coming into contact with the inner surface of the guide tube. Since the contact portion is limited to the guide portion and the arrangement of the inner tube can be limited, the length of the inner tube can be shortened.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a side view of a guide tube structure of an oil level gauge according to the present invention, and shows a part of a lower portion in cross section. The guide tube 1 is a guide tube 1 for inserting and holding an oil level gauge 2 for measuring the oil level L of the oil pan 3, and is formed of a steel pipe in order to keep product costs low.
[0011]
1 to 4, an outer tube 10a is joined to a portion A where the oil level gauge 2 and the guide tube 1 are in contact with each other to form a guide tube main body 10, and a buffer such as a rubber material is formed on the inside thereof. The inner tube 12 is disposed in close contact with the material 13. The inner tube 12 is formed by inserting the inner tube 12 baked with, for example, a rubber 13 serving as a buffer material into the outer tube 10a, and further, as shown in FIG. Can be disposed in close contact with the outer tube 10a by simultaneously forming them in both the outer tube 10a and the inner tube 12.
[0012]
Further, when the inner pipe 12 is disposed in the inner portion of the guide tube 1 that comes into contact with the oil level gauge 2 when the oil level gauge 2 is mounted, the tip of the oil level gauge 2 is connected to the inner pipe with less vibration. 12, the vibration of the oil level gauge 1 can be reduced, which is effective.
Further, the oil level gauge 2 is provided with a guide portion 22 in order to prevent the gauge portion 21 of the oil level gauge 2 from contacting the inner surface of the guide tube 1.
[0013]
As shown in FIG. 2, the guide portion 22 is provided with a refracting portion 22 by bending the body 20 of the oil level gauge 2 into a dogleg shape about 2 to 4 times, and the refracting portion 22 inserts the oil level gauge 2 and It is provided by forming so as to slide against or slightly contact the inner wall of the guide tube 2 when mounting.
The shape of the guide portion 22 is not limited to this, and a loop portion may be provided in the main body 20 of the oil level gauge 2, or a cut is made in a part of the main body 20 as shown in FIG. Alternatively, the guide portion 22 may be provided by bending only a portion having a protrusion and protruding from the main body 20, or the protrusion portions may be attached to both sides of the main body 20.
[0014]
In short, the guide portion 22 protruding in the inner diameter direction may be provided so as to have a diameter slightly smaller than the inner diameter of the guide tube 2, and the guide portion 22 may be configured to contact the guide tube 1.
According to the guide tube structure of the oil level gauge 2 having the above configuration, the vibration of the guide tube body 10 can be absorbed and attenuated by the buffer material 13 between the guide tube main body 10 and the noise accompanying the vibration of the guide tube is reduced. In addition, the noise generated by the vibration of the oil level gauge 2 can also be sound-insulated and absorbed, and the overall noise can be reduced.
[0015]
Further, the inner tube 12, in a state where the oil level gauge 2 is mounted, by disposing a portion A bent portion of the oil level gauge 2 is in contact, the refractive portion of the oil level gauge 2 is outside of the main body 10 The oil level gauge 2 is held in the main body of the guide tube 1 while not in direct contact with the tube 10a but in contact with only the inner surface of the inner tube 12 through the buffer material 13 formed of an elastic body such as rubber material. .
[0016]
Accordingly, the vibration of the main body 10 is attenuated by the buffer material 13 and transmitted to the inner tube 12, so that the vibration of the oil level gauge 2 can be suppressed and the noise accompanying this vibration can be reduced. Further, the arrangement of the inner tube 12 be limited to the portion of contact the oil level gauge 2 when mounting the oil level gauge 2, it is possible to suppress an increase in cost and weight.
Further, since the guide portion 22 of the oil level gauge 2 is formed so that only the refracting portion contacts the inner surface of the inner tube 12, the inner surface of the guide tube 1 is removed when the gauge portion 21 of the oil level gauge 2 pulls out the oil level gauge 2. Is prevented from touching .
[0017]
Therefore, if the inner pipe 12 is provided only in this limited specific part, the lower part of the oil level gauge 2, that is, the tip part can be reliably held by the inner pipe 12 part. Since it can be shortened to the minimum necessary, the product cost can be reduced.
According to an example of the noise reduction shown in FIG. 6, the noise level Sa of the conventional guide tube structure shown by a solid line is lowered from the noise level Sb of the guide tube structure according to the present invention shown by a dotted line in a wide frequency range. In particular, it can be seen that a large noise reduction effect is exhibited at the E portion of the low frequency.
[0018]
That is, the present invention uses the steel tube guide tube 1 that is advantageous in terms of cost so that both the noise level and the product cost are acceptable, and is in contact with the level gauge 2 of the guide tube 1. The inner pipe 12 on which the rubber 13 is baked is installed in the portion A where noise is generated, and the noise level is reduced to an allowable range by reducing noise.
[0019]
【The invention's effect】
According to the guide tube structure of the oil level gauge of the present invention, the vibration of the guide tube main body can be absorbed and damped by the buffer material between the inner tube and the noise accompanying the vibration of the guide tube can be reduced. Since noise generated by the vibration of the oil level gauge can also be sound-insulated and absorbed, noise can be reduced as a whole.
[0020]
Also, by placing the inner tube at the lower end of the guide tube so that the installed oil level gauge contacts the guide tube with the inner tube, there is less vibration provided through the cushioning material to the oil level gauge The guide tube's inner tube part makes contact, and the vibration of the guide tube's main body that occurs due to the vibration of the engine is attenuated by the buffer and then propagates to the oil level gauge. It can reduce, and the noise accompanying this vibration can be reduced.
[0021]
Further, by providing the oil level gauge with a guide portion comprising a refracting portion , when the oil level gauge is attached, that is, when the gauge portion is immersed in the oil in the oil pan, the refracting portion is provided on the guide tube body. It is designed to come into contact with the inner pipe arranged only near the flange, and since only this inner pipe part comes into contact with the tip of the level gauge, the length of this inner pipe can be shortened. Product cost can be reduced.
[Brief description of the drawings]
FIG. 1 is a side view of a guide tube of an oil level gauge according to the present invention.
FIG. 2 is an enlarged cross-sectional view of a portion A in FIG.
FIG. 3 is a cross-sectional view taken along line BB in FIG.
4 is a cross-sectional view taken along the line CC of FIG. 1;
FIG. 5 is a partial perspective view showing another embodiment of the guide part of the oil level gauge.
FIG. 6 is a relationship diagram of frequency and noise level showing the effect of the present invention.
FIG. 7 is an explanatory diagram of an engine showing the arrangement of guide tubes.
FIG. 8 is a side view of a guide tube of a conventional oil level gauge.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Guide tube 2 ... Oil level gauge 3 ... Oil pan 4 ... Engine 10 ... Guide tube main body 10a ... Outer pipe 12 ... Inner pipe 13 ... Buffer material 14 ... Flange 15 ... Stopper boss 20 ... Oil level gauge main body 21 ... Gauge part 22 ... Guide section

Claims (1)

A guide tube structure with an oil level gauge for measuring the oil level,
A guide tube main body formed of a steel pipe, and an upper portion of a steel outer cylinder fixed to the lower end of a flange fixed to the oil pan are fixed to the outer periphery of the lower end of the guide tube main body. An inner cylinder made of steel is placed inside, and a cushioning material such as rubber is placed on the entire outer peripheral surface of the inner cylinder, and a stopper boss is formed by bulging an intermediate portion of the inner cylinder with the outer cylinder. Integrated,
When an oil level gauge main body is inserted and installed in the guide tube, a guide portion having a plurality of refracting portions formed on the oil level gauge main body is contact-supported at a plurality of points on the inner cylinder inner surface. An oil level gauge guide tube structure characterized by comprising.

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