JPS5937478Y2 - oil filler cap - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an oil filler cap with good sealing performance.

In general-purpose engines installed in lawn mowers, concrete cutter plates, etc., a rod-shaped oil level gauge is integrated in the lower part of the interior to check whether the amount of lubricating oil is appropriate, and the oil is used to block the oil inlet. A filler cap is provided, and the inspection is performed periodically.

By the way, since such a general-purpose engine is used in an atmosphere where a large amount of dust exists due to its purpose, a large amount of dust and the like adheres to the vicinity of the oil inlet provided in the engine unit.

Therefore, when checking the oil level, refueling, etc., when removing the oil filler cap, or after removing it, dust and the like from the vicinity of the oil inlet are likely to enter the inside of the oil filler cap.

In particular, in general-purpose engines, the internal lubrication of the engine uses a droplet lubrication method using the dipper of the connecting rod, and unlike engines equipped with oil pumps such as those installed in automobiles, there is no filter to remove foreign substances. It is easy to get into the parts and cause problems such as wear and galling of the parts.

In addition, users of general-purpose engines in particular often lack the above knowledge, so it is important to solve the problem from a technical configuration perspective.

The object of the present invention is to provide an oil filler cap that effectively eliminates such problems, has good sealing properties, is suitable for mass production, and is inexpensive.

In order to achieve the above purpose, the present invention is applied to an oil filler cap that is fastened to the inner wall of a flange-shaped oil inlet. It is characterized by an elastic packing consisting of a cylindrical labyrinth edge formed integrally with the.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

Fig. 1 is a partially sectional side view of the oil filler cap, Fig. 2 is a sectional view taken along line 2-2 in Fig. 1, and Fig. 3 is a partially sectional side view of the oil filler cap fastened to the oil inlet.
FIG. 4 each shows a plan view of the oil filler cap.

The oil filler cap designated by reference numeral 1 in the figure has an oil filler cap main body 2 at the upper part, an oil level gauge 3 at the lower part integrally molded of, for example, synthetic resin, and is also provided with a separate elastic packing 4.

The cap body 2 has a disc-shaped cap flange 5 in the middle part.
A plate-shaped knob 6 integrally protrudes from the two sides of the plate, and a tightening screw 7 which is integrally formed in the center of the lower surface of the collar 5 and has a smaller outer diameter than this.

On the upper side of this threaded part 7, a cut groove 8 into which the packing 4 fits is formed extending from the lower surface of the flange part 5 to a predetermined width and around the circumference, and a threaded part 9 is provided in the middle, and a gauge mounting part 1 is provided further below.
form 0.

In addition, a through hole 11 having a rectangular cross section is bored in the upper half of the screw portion 7 in the diametrical direction, and unnecessary portions are cut out to reduce material cost and weight.

Note that the formation of this through hole 11 is subject to restrictions due to the production of a special mold or from the viewpoint of fastening strength, but the center of the through hole 11 is at least thickened beyond the second peak from -1- of the screw 9. It has been confirmed that removing it makes it easier to tighten when screwing it into the oil inlet.

Furthermore, a plurality of cutout grooves 12 are formed inside the gauge mounting portion 10 from the sides to reduce the thickness, thereby reducing cost and weight.

In this embodiment, in consideration of moldability, the cross-shaped connecting portion 13 is left and formed from four directions as shown in FIG.

On the other hand, at the center of the lower surface of the gauge mounting portion 10, the oil level gauge 3 is integrally formed and extends downward, and has a relatively elongated plate shape and has an uneven pattern 3a for an oil reservoir on its surface.

Therefore, the oil filler cap main body 2 and the oil level gauge 3 described above can be easily molded using a pair of left and right molds with the parting line set at the dashed line P shown in FIG.

On the other hand, the elastic packing 4 is made of an elastic material such as rubber or soft synthetic resin, and includes a flat ring 4a having a predetermined wall thickness that fits into the cut groove 8 and overlaps the lower layer of the flange 5. A cylindrical labyrinth edge 4 hanging downward integrally with the periphery
As shown in FIG. 3, this labyrinth edge fits into the outer circumferential wall of an oil inlet 15 formed outwardly in a flange shape at a predetermined position of, for example, the crankcase 14 on the engine side.

It is also possible to form the labyrinth edge 4b of the elastic packing 4 integrally with the flange 5 of the cap body 2, but in this case, the pair of left and right molds described above cannot be used for molding. , it is necessary to use a pair of upper and lower molds and remove the molded product from the mold by punching.

Moreover, the above-mentioned through hole 11. Notch grooves 12 cannot be cut out, and the moldability is also poor.

Therefore, in the present invention, the labyrinth body is provided in the elastic packing 4 separate from the camp body 2, which effectively improves the moldability of the cap body 2, reduces the cost by reducing the thickness, and reduces the weight. The purpose of this is to improve sealing properties.

The sealing performance is achieved by fitting the elastic packing 4 into the cut groove 8 of the oil filler cap main body 2 in advance as shown in FIG. When part 7 is screwed and tightened, plate-like ring 4 is formed.
a is in pressure contact with the tip of the inlet 15, and the labyrinth edge 4b is in pressure contact with the outer circumferential wall of the inlet 15, and most of the flange-shaped inlet 15 is covered with the oil filler cap 1, providing a high level of sealing performance over a wide range. will be guaranteed.

As is clear from the above description, the oil filler cap according to the present invention has an elastic packing in which a labyrinth edge that fits on the outer peripheral wall of the flange-shaped oil inlet is integrally formed on the outer peripheral end of the flat ring. Good sealing performance effectively prevents nearby dust from entering the injection port, for example, when the cap is attached or removed.

In addition, by providing the labyrinth edge on the elastic packing side, which is separate from the cap body, it is possible to improve the moldability of the cap body, that is, to effectively cut out the thickness, which makes it possible to reduce weight, cost, and mass production. It can be provided as an oil filler cap with high practical and economical value.

[Brief explanation of the drawing]

Fig. 1 is a partially sectional front view of the oil filler cap, Fig. 2 is a sectional view taken along line 2-2 in Fig. 1, and Fig. 3 is a partially sectional side view of the oil filler cap fastened to the oil inlet.
FIG. 4 is a plan view of the oil filler cap. In the drawing, 4 is an elastic packing, 4a is a flat ring, 4
b is a labyrinth edge, 5 is a cap flange, and 15 is an oil inlet.

Claims (1)

[Claim for Utility Model Registration] In an oil filler cap that is fastened to the inner wall of a flange-shaped oil inlet, there is a flat ring on the lower surface of the cap flange, which overlaps with the lower surface of the flange, and a cylindrical shape integrally formed on the outer peripheral edge of the oil filler cap. An oil filler cap characterized by an elastic gasket consisting of a labyrinth edge. −゛