JPH0532706U - Oil level gauge - Google Patents

Abstract

(57) [Summary] [Purpose] To stabilize the load when the gauge rod is attached and detached, and to prevent the cap insertion part from sticking to the oil detection hole during long-term attachment. A constitution is characterized in that an outer peripheral surface of an insertion portion 2'of a cap 2 formed of a rubber-like elastic body is rough and the insertion portion 2'of the cap 2 is formed in a polygonal cross section.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention relates to an oil level gauge used for checking the amount of lubricating oil in an internal combustion engine.

[0002]

[Prior Art]

 Conventionally, a cap made of rubber-like elastic material is provided on the upper end of the gauge rod, and multiple step parts are formed in the insertion part of the cap, and each step part has a vertical air bleed groove with different phases. The one provided is known.

However, the outer peripheral surface of the insertion portion of the above conventional cap is a circular smooth surface, and when press-fitted into the oil detection hole on the engine side, the entire outer peripheral surface comes into close contact with the inner surface of the oil detection hole. If there is variation in the outer diameter of the part or the inner diameter of the oil check hole, the load when attaching and detaching the insertion part will become unstable, making it easy to pull out and difficult to press fit. If the product is worn for a long period of time underneath, the elasticity of the rubber will decrease (stain), and the chemical reaction between the rubber and oil will cause the insertion part to stick to the oil test hole and prevent the gauge bar from coming off. was there.

[0004]

[Problems to be solved by the device]

 This invention solves the problems of instability of the load when the gauge rod is attached and detached, and the sticking of the cap insertion part to the oil detection hole.

[0005]

[Means for Solving the Problems]

 This invention is an oil level gauge in which the outer peripheral surface of the insertion portion 2'of the cap 2 formed of a rubber-like elastic body is rough and the insertion portion 2'of the cap 2 is formed in a polygonal cross section. Is proposed.

[0006]

[Function] Since the outer peripheral surface of the insertion portion 2'is rough, the entire surface of the insertion portion 2'does not adhere to the inner peripheral surface of the oil detection hole into which the oil level gauge is inserted. The small ridges make partial contact with each other to reduce the contact area, and the tiny ridges on the rough surface absorb variations in the outer diameter of the insertion portion 2'and the inner diameter of the oil detection hole.

As a result, the frictional resistance when the cap 1 is attached and removed is small, and the attachment and detachment load is small and stable (uniform), and at the same time, in the small valleys of the inner surface of the oil detection hole and the rough surface of the insertion portion 2 ′. Since it is non-contact, it is prevented from sticking to the oil check hole even when it is worn for a long time.

Further, by forming the insertion portion 2 ′ to have a polygonal cross section, the contact area with the inner peripheral surface of the oil detecting hole is reduced, and the same result as that of the rough surface can be obtained and the oil detecting hole is obtained. When the cap 2 is press-fitted into the hole, an air bleeding gap is formed between the adjacent corners of the insertion portion 2 ', which facilitates the detaching operation and prevents the cap 2 from coming out due to the internal pressure.

[0009]

【Example】

In the first embodiment shown in FIGS. 1 and 2, a cap 2 is provided on the upper end of the gauge rod 1 by a rubber-like elastic body, and a plurality of tapered stepped portions below the cap 2 are formed. The outer peripheral surface of 2'is formed into a rough surface (for example, a roughness of about 60 to 80 μR _Z ) such as a satin-like shape as shown in FIG. 1 or a knurled shape as shown in FIG.

The rough surface is machined by subjecting the inner surface of the molding die of the insertion portion 2 ′ of the cap 2 to electric discharge machining, blasting, graining, etc., and molding the rough surface simultaneously with the insertion portion. It is transferred to the surface of 2 ', but especially if the matte treatment is performed by electric discharge machining, the machining time is short and the machining cost can be reduced.

In the second embodiment shown in FIG. 3, the insertion portion 2 ′ of the cap 2 is formed in a polygonal shape such as a quadrangular cross section, and when the insertion portion 2 ′ is press-fitted into the oil detecting hole on the engine side, the polygonal cross section is formed. It is pressure-bonded to the inner surface of the oil test hole at the corners, and a gap is created between the adjacent corners for air bleeding.

Also in this second embodiment, it is desirable to form the outer peripheral surface of the insertion portion 2'to a rough surface as in the first embodiment.

[0013]

[Effect of the device]

 As described above, according to the present invention, the frictional resistance at the time of attaching and detaching the cap is small, the loading and unloading load is small, and it is stable, and it is possible to prevent the insertion portion from sticking to the oil detecting hole even during long-term mounting. ..

[Brief description of drawings]

FIG. 1 is a side view showing an aspect of a first embodiment of the present invention.

FIG. 2 is a side view showing another aspect of the first embodiment of the present invention.

FIG. 3 is a side view showing an aspect of a second embodiment of the present invention.

FIG. 4 is a cross-sectional view of the second embodiment of the present invention.

[Explanation of symbols]

 1 gauge bar 2 cap 2'insertion part

Claims (3)

[Scope of utility model registration request] 1. An oil level gauge, wherein an outer peripheral surface of an insertion portion of a cap formed of a rubber-like elastic body is a rough surface. 2. An oil level gauge, characterized in that an insertion portion of a cap formed of a rubber-like elastic body has a polygonal cross section. 3. The oil level gauge according to claim 2, wherein the outer peripheral surface of the insertion portion is a rough surface.