JPH0544751Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a measuring device for measuring the amount of oil in an internal combustion engine, and specifically relates to a sealing structure for a rod-shaped gauge.

[Prior Art] Conventionally, in order to measure the amount of oil in an oil reservoir such as an engine oil pan or a transmission oil reservoir, a gauge rod is inserted through a guide pipe installed near the oil reservoir and the oil is deposited on the oil reservoir. The amount of oil is judged by the oil wet position on the scale carved on it, and most of the structures are a rod-shaped object with a guide stopper made of an elastic material such as synthetic rubber integrated into it. .

However, guide plugs made from this elastic material are inferior in moldability and cost, and at present, guide plugs are made of inexpensive synthetic resin and have an O-ring interposed between them for fixation and sealing. It is being replaced.

[Problem to be solved by the invention] However, the oil level gauge A, which has an O-ring attached to the guide plug, has a small rubber elastic mass when inserted into the guide pipe, so it is difficult to set the dimensions.
Furthermore, since the insertion and removal forces are the same, there is a correlation that if the insertion is made easier, it will be easier to come out, and if the diameter is increased and it is difficult to come out, it will be difficult to insert.

In order to eliminate this drawback, not only the shape of the O-ring but also its material have been investigated, but a complete solution has not yet been found.

The object of the present invention is to eliminate all of these many drawbacks and provide an inexpensive oil level gauge that is easy to handle.

A detailed description will be given below with reference to the drawings.

[Means for Solving the Problems] As shown in FIG. 1, the present invention provides an oil level gauge in which a rod-shaped gauge body a is provided with a guide plug 2 and is inserted into a guide pipe 1 communicating with an oil reservoir. In the sealing structure of A, an annular groove 3 is provided on the outer circumferential surface of the guide plug 2, an O-ring 4 is attached to the annular groove 3, and the lower circumferential surface of the annular groove 3 is formed into a tapered surface 5 that expands downward. It is characterized by what it did.

[Function] The present invention achieves the following functions by virtue of the above-described structure.

That is, as shown in FIG. 1, when inserted into the guide pipe 1, the O-ring 4 of the guide plug 2 is in a position where it contacts the upper circumferential surface of the annular groove 3 as shown by the dotted line, and a geometrical load is applied. Move when not in use. However, when it is pulled out, the O-ring 4 moves away from the upper circumferential surface of the annular groove 3 to the lower circumferential surface due to contact resistance. Here, the O-ring 4 is sandwiched in the triangular shape formed by the tapered surface 5 of the lower circumferential surface and the inner circumferential wall of the guide pipe 1, and is pressed against the corners of the triangle and deforms, greatly increasing the resistance. Here, the oil level gauge A has a high pull-out resistance, and its fixed installation is ensured.

[Example] In carrying out the present invention, the tapered surface 5 provided in the annular groove 3 does not need to have a detailed angle setting from the viewpoint of reliability of operation and effect, but the angle can be adjusted freely depending on the relationship with sealing performance. can be replaced.

Further, as shown in FIG. 3, the lower circumferential surface and bottom surface of the annular groove 3 can be formed in one plane, and the effect can be generated more directly and sensitively.

In addition, in this invention, the annular groove 3 and the O-ring 4 are provided in only one place.
It may be provided at multiple locations, such as three locations.

[Effects of the invention] As described above, according to the invention, the oil level gauge can be inserted with a light fitting force, but when it is removed, the fitting force is greatly increased and the oil level gauge is completely prevented from falling off. Of course, the material of each component is inexpensive and can be provided at a low price, and if performance deteriorates, it is extremely easy to recover from it, which has excellent effects.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the oil level gauge of the present invention installed. Figures 2 and 3
The figure is a partially enlarged sectional view showing another embodiment of the present invention. A... Oil level gauge, a... Gauge body, 1... Guide pipe, 2... Guide stopper, 3...
...Annular groove, 4...O ring, 5...Tapered surface.

Claims (1)

[Scope of utility model registration request] In the sealing structure of the oil level gauge A, which is equipped with a guide plug 2 on the gauge body a and is attached to a guide pipe 1 communicating with an oil reservoir; 4
A sealing structure for an oil level gauge characterized in that the lower circumferential surface of the annular groove 3 is formed into a tapered surface 5 that expands downward.