JPS609367Y2 - oil cap - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an oil cap for adjusting pressure in a lubricating oil system or the like.

Conventionally, an oil cap has been attached to an engine's lubricating oil system or cooling oil system.

FIG. 1 is a longitudinal sectional view showing a conventional example of such an oil cap.

Reference numeral 1 designates a dish-shaped cap body, and a rod-shaped protrusion 2 is provided at the center of the inner side of the cap body.

Usually, the cap body 1 and the protrusion 2 are integrally formed of a metal material or a synthetic resin material.

Further, a locking portion 3 is formed in a ring shape on the lower circumferential surface of the protrusion 2.

Furthermore, a groove 4 for an air breather is provided inside the cap body 1, and this groove 4 is provided so as to continue from near the base of the projection 2 toward the end of the flange portion 1a.

A ring-shaped backing 5 made of rubber or the like is fitted into the inner surface of the cap body 1 so as to cover the groove 4.

A notch 6 is bored in the inner circumferential surface of the backing 5, and this notch 6 faces the groove 4 so as to communicate with it.

7 is a lock spring, and this lock spring 7
The inner peripheral flange portion 7a is slidably fitted into the protrusion 2.

Further, a locking piece 8 extending substantially horizontally is provided on a part of the outer peripheral flange portion 7b of the lock spring 7 in a protruding manner.

This lock spring 7 is usually obtained by press molding a metal plate.

A coil spring 9 that urges the lock spring 7 toward the backing 5 is fitted between the lower surface of the lock spring 7 and the locking portion 3.

In the oil cap having such a structure, the locking piece 8 is inserted into the mouth 11 of the oil tank 10 and rotated while pushing it by hand, so that the locking piece 8 is attached to the locking protrusion 11a of the mouth 11.
By engaging with the opening 11, the opening 11 is closed.

Further, the locked state is maintained by the elastic force of the coil spring 9.

At this time, the inside of the tank 10 is communicated with the outside air through the gap between the protrusion 2 and the inner peripheral flange 7a of the lock spring 7, the notch 6, and the air breather groove 4, and the pressure inside the tank 10 is reduced. It acts to release it to the outside.

However, in such a conventional oil cap 1,
When the tank 10 vibrates while the car is running, the oil in the tank 10 oozes or leaks through the passages, causing problems such as staining the engine area.

The present invention was developed in view of these conventional problems, and in particular, a large number of ring-shaped protrusions for sealing are provided concentrically on the upper and lower surfaces of the backing that is attached to the inner surface of the cap body, and the backing is An oil drainage chamber is provided between the backing and the cap body, and between this backing and the lock spring that securely holds the cap body to the mouth of the tank. An object of the present invention is to provide an oil cap that effectively prevents oil leakage.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 is a longitudinal sectional view showing one embodiment of the oil cap according to this invention.

Note that the same components as shown in FIG. 1 are given the same reference numerals.

In the figure, reference numeral 12 denotes a dish-shaped backing that is fitted into the protrusion 2 and whose upper mounting surface is in contact with the inner surface of the cap body 1 (the surface where the groove 4 is provided), near the center of the backing. is recessed into a dish-like shape, and is provided with a center hole 13 as shown in FIG. 3, and a ventilation notch 14 is provided so as to be connected to this center hole 13.

Further, a plurality of ring-shaped protrusions 12a are provided on the upper and lower mounting surfaces of the backing 12.

On the lower surface of the backing 12, there are also the protrusions 2 and 2.
The upper mounting surface of a dish-shaped lock spring 15 fitted into the plate is in contact with the mounting surface of the plate-shaped lock spring 15.

This lock spring 15 has a dish-shaped recess near its center and is provided with a center hole 16 as shown in FIG.

Further, a ventilation notch 17 is provided so as to be continuous with the center hole 16.

Further, locking pieces 19 are provided at opposing positions on the outer periphery of the lock spring 15.

And these backing 12 and lock spring 15
are pressed against the inner surface of the cap body 1 by the coil spring 9 as shown in FIG. 2, and oil draining chambers 20, 21 are formed between them.

In the oil cap having such a structure, insert the oil cap into the mouth 11 of the oil tank 10 and rotate it while pushing it by hand to lock the locking piece 19 of the lock spring 15 into the locking protrusion 11a of the mouth 11. Lock it in place.

This state is shown in FIG. In the oil cap having such a structure, the inside of the tank 10 is located between the outer periphery of the protrusion 2 and the inner periphery of the backing 12 and the lock spring 15, particularly the notches 14, 17, the oil drain chambers 20, 21, and the air gap. They communicate with the outside air through the breather grooves 4, respectively, and maintain the inside of the tank 10 at a predetermined pressure.

In this case, when the tank 10 is subjected to vibrations, the oil vibrates and tries to leak out of the tank 10 through the above-mentioned passages, but the oil flows through the first and second two passages. The sealing ring-shaped protrusion 12a of the backing 12 is accommodated in stages in the oil draining chambers 20 and 21.
, and almost never reaches the air breather groove 4 provided in the cap body 1.

Moreover, the oil once stored in the oil drain chamber 20.21 passes through the respective notches 14, 17 again and enters the tank 1.
After all, the oil in the tank 10 no longer leaks or oozes to the outside.

As explained above, according to the present invention, a dish-shaped backing is brought into contact with the inner surface of the cap body having an air breather groove on the inner surface, and the first oil is placed between the backing and the inner surface of the cap body. A cutting chamber is provided, and a mounting surface of a dish-shaped lock spring is elastically brought into contact with the mounting surface of the backing by a coil spring, thereby providing a second oil cutting chamber between the lock spring and the backing; By communicating both of these oil drain chambers with the inside of the tank and the air breather groove through a narrow ventilation path, the pressure inside the tank can be maintained at a substantially constant value, and oil leakage and oozing can be prevented.

In this way, unnecessary consumption of oil and contamination around the engine can be prevented.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a conventional oil cap, FIG. 2 is a longitudinal sectional view of an oil cap according to the present invention, FIG. 3 is a plan view of the backing, and FIG. 4 is a plan view of the lock spring. 1... Cap body, 2... Protrusion, 4
... Air breather groove, 9 ... Coil spring, 10 ... Tank, 12 ...
... Backing, 14.17 ... Passage (cutout)
, 15... Tatsuku Spring, 20...
First oil cutting chamber, 21... Second oil cutting chamber.

Claims (1)

[Scope of utility model registration request] A dish-shaped backing is brought into contact with the inner surface of the cap body having an air breather groove on the inner surface, and a first oil draining chamber is provided between the backing and the inner surface of the cap body, and a mounting surface of the backing is provided. The mounting surface of the dish-shaped lock spring is brought into elastic contact with a coil spring, and a second oil drain chamber is provided between the lock spring and the backing, and both oil drain chambers are connected to the inside of the tank and the backing. An oil cap characterized in that it communicates with the air breather groove through a narrow passage.