JP2531683Y2 - Oil level gauge - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention relates to an oil level gauge for measuring the remaining amount of oil in a device in which oil is stored in an engine or a transmission, for example.

(Prior Art) Conventional oil level gauges include those shown in FIGS. 4 and 5, for example. That is, the oil level gauge 100 includes a rod portion 102 inserted into the measurement pipe 101 by a predetermined length, and a packing portion 103 provided integrally with the rod portion 102.
The oil level gauge 100 is fixed by tightly fitting the outer circumference to the inner circumference of the measuring pipe 101, and the measuring pipe 101
Had been sealed.

In addition, a metal cap 1
04 is integrally attached, and a small gap 105 is formed between the inner periphery of the cap 104 and the outer periphery of the opening end of the measuring pipe 101 to form a maze structure to prevent intrusion of water and dust from the outside. Had been prevented.

(Problems to be solved by the invention) However, in the case of the above-described conventional technology, in order to form a maze structure, it is necessary to cover the packing portion 103 with the cap 104, and the number of parts increases, which takes time and effort to manufacture.
There was a problem that the cost was high.

The present invention has been made to solve the above-mentioned problems of the prior art, and an object of the present invention is to provide an oil level gauge that can reliably seal a packing portion with a simple structure.

(Means for Solving the Problems) In order to achieve the above object, according to the present invention, a rod-shaped portion inserted into the measuring tube portion, and a rod-shaped portion integrally fixed to the rod-shaped portion, inside the measuring tube portion. An oil level gauge having a packing part fitted around the periphery, wherein the packing part is provided with an annular groove which is fitted in a state where an opening end of the measuring cylinder part has a gap; A projection is provided on the inner diameter side, which is in close contact with the inner circumference of the measurement cylinder, and a lip is provided on the outer diameter side of the annular groove, which is in close contact with the outer circumference of the measurement cylinder, and the projection and the lip sandwich the inner and outer circumferences of the measurement cylinder. And the inner and outer peripheries of the measurement projections are sealed.

(Operation) In the oil level gauge having the above-described configuration, when the rod portion is inserted into the measuring tube portion and the packing portion is fitted to the inner periphery of the opening portion, the opening end portion of the measuring tube portion is provided in the packing portion. It is fluid-tightly inserted into the annular groove.

In particular, the opening end of the measuring cylinder is fitted in the annular groove with a gap, and the inner and outer circumferences of the measuring cylinder are formed by protrusions and lips provided on the inner and outer diameter sides of the inlet of the annular groove. Since they are tightly sandwiched, the contact surface pressure per unit area can be increased and the sealing effect can be further enhanced as compared with the case where the measuring cylinder is fitted into the entire annular groove.

(Example) Hereinafter, the present invention will be described based on an illustrated example.
FIG. 1 shows an oil level gauge according to an embodiment of the present invention.
In FIG. 2 and FIG. 2, reference numeral 1 denotes an entire oil level gauge, and a metal core 3 as a rod-shaped portion inserted into the measuring pipe 2 and a packing portion integrally fixed to the metal core 3 by baking. And a rubber packing portion 4.

The cored bar 3 is made of a round bar, and has a ring-shaped grip portion 31 at one end and a scale portion 32 at the other end.

The rubber packing portion 4 has a substantially T-shaped cross section, and has a cylindrical plug body 41 fitted to the inner circumference of the measuring pipe 2.
And a flange portion 42 extending from one end of the flange 41 in the radial direction. A tapered projection 43 is provided on the outer periphery of the base of the plug 41 so as to be gradually tapered toward the insertion direction.
Close to the inner circumference.

On the other hand, the annular groove 5 at the base of the plug portion 41 of the flange portion 42 is such that when the oil level gauge 1 is inserted into the measuring pipe 2, the opening end of the measuring pipe 2 just enters.
Are formed.

The annular groove 5 has a substantially rectangular cross section, its inner end surface 51 is a flat surface, its inner diameter side wall surface is continuous with the outer periphery of the plug body portion 41, and the projection 43 is located at the opening of the annular groove 5. . And
The width of the annular groove 5 is made smaller than the thickness of the measuring pipe 2 so that a margin is provided between the two.

In this embodiment, the inlet of the annular groove 5 is locally narrowed to seal the inner and outer peripheries of the open end of the measuring pipe 2. As shown in FIG. The opening end of the measuring pipe 2 is fitted with a gap. The inlet portion is constituted by a top portion of a projection 43 provided on the outer periphery of the plug body portion 41 and an inner end of an annular lip 52 projecting inward in the radial direction provided on an outer diameter side wall surface of the annular groove 5. .

As the shape of the annular lip 52, various shapes can be selected as shown in FIG. That is, the tip may be a flat surface as shown in FIG. 7A, or may be triangular as shown in FIG. 7B, and the tip may be formed as shown in FIG. The shape may be an arc.

In the oil level gauge having the above configuration, the assembling of the oil level gauge 1 is performed by inserting the mandrel 3 into the measuring pipe 2 with the graduation portion 32 facing down, and measuring the plug 41 of the packing portion 4. To the inner circumference of the opening of the pipe 2 for use. When the plug 41 is inserted to the base, the open end of the measuring pipe 2 is automatically inserted into the annular groove 5 at the base of the plug 41, and the end of the pipe 2 is brought into contact with the inner end surface 51 of the annular groove 5. It is positioned at the contact position.

On the inner and outer circumferences of the open end of the measuring pipe 2, a projection 43 on the inner diameter side of the inlet portion of the annular groove 5 and a lip 52 on the outer diameter side are in fluid tight contact with the whole circumference to prevent foreign matter such as water and dust. Intrusion is reliably prevented.

(Effects of the Invention) The present invention has the above-described configuration and operation. The opening end of the measuring cylinder is fitted into the annular groove provided in the packing portion with a gap, and the entrance of the annular groove is provided. Because the inner and outer circumferences of the measuring cylinder are tightly sandwiched by the projections and lips provided on the inner and outer diameter sides, the per-unit area per unit area is smaller than when the measuring cylinder is fitted into the entire annular groove. The contact surface pressure can be increased, and the sealing effect can be enhanced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an oil level gauge according to an embodiment of the present invention, FIG. 2 is a sectional view of a main part in a state where a packing part and a measuring pipe of FIG. 1 are fitted, and FIG. 4) to 4 (c) are cross-sectional views of main parts showing various aspects of the annular groove of the packing, FIG. 4 is a vertical cross-sectional view of a conventional oil level gauge, and FIG. 5 is a cross-sectional view of main parts of FIG. DESCRIPTION OF SYMBOLS 1 ... Oil level gauge, 2 ... Pipe for measurement 3 ... Core metal (bar-shaped part) 31 ... Grip part, 32 ... Scale part 4 ... Rubber packing part, 41 ... Plug body part 42 ... Flange Part, 43 Projection 5 Annular groove 51 Back end face 52 Lip

Claims (1)

(57) [Scope of request for utility model registration] 1. An oil level gauge having a rod portion inserted into a measurement tube portion and a packing portion integrally fixed to the rod portion and fitted to the inner periphery of the measurement tube portion, wherein the packing portion is An annular groove which is fitted in a state where the opening end of the measuring cylinder has a gap, and a projection which closely contacts the inner periphery of the measuring cylinder at an inner diameter side of an entrance of the annular groove; An oil level gauge, wherein a lip closely contacting the outer periphery of the measuring cylinder portion is provided on the outer diameter side of the measuring tube, and the inner and outer periphery of the measuring projection are sealed with the projection and the lip sandwiching the inner and outer periphery of the measuring cylinder portion. .