JPS5915798Y2 - Air breather cover for oil tank - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a reservoir cover that also serves as a dustproof cover for an air breather of an oil reservoir disposed in a hydraulic unit system and prevents an abnormal drop in air pressure in the tank.

The oil reservoir that forms part of the hydraulic unit system is provided to ensure that the amount of oil filled in the tank increases or decreases depending on the operating status of the system.

In order to maintain the reliable operation of solenoid valves, etc., which are generally placed in hydraulic systems, it is necessary to prevent dust from getting into the oil. Therefore, the tank must be sealed from the outside air and equipped with a filter. Usually, an air breather is attached to the upper fuel filler port of the iron tank.

Incidentally, in this type of device, a dustproof cover may be further attached to the air breather depending on usage conditions.

For example, if the operating environment is bad and there is a large amount of dust in the surrounding area, the air breather may become clogged with dust.
This is because sufficient dustproofness cannot be ensured.

However, when the dust-proof cover is made of a rigid body and is completely sealed from the outside air, another difficulty arises.

In other words, even if complete sealing sufficiently eliminates problems such as leakage of filters in the hydraulic system, if there is a large increase or decrease in the amount of oil in the tank, it is possible that negative pressure will occur, and in severe cases. This is because cavitation may occur, which may impede the durability of the device.

This negative pressure problem can be avoided, for example, by forming the dustproof cover from an elastic material such as rubber, depending on the degree of flexural deformation.

However, for example, when air is removed from the brake equipment that makes up the system, the amount of oil leaking from the oil reservoir into the hydraulic system is so large that it may not be able to be absorbed by the flexural deformation of the elastic cover. .

FIG. 4 shows a case where such a conventional dustproof cover 20 made of an elastic body is fitted into a circumferential groove 23 formed in an air breather 22 above an oil reservoir tank 21.

Furthermore, in the one shown in FIG. 5 proposed in Japanese Utility Model Publication No. 42-4653, a part of the dustproof cover 24 is formed with an opening 25 that communicates with the outside air, and inside the cover 24, an opening 25 is formed that is connected to the air breather 22. It is also known that the lip 26 is provided with a lip 26 that allows circulation between the chambers on both sides by bending in response to the difference in air pressure on both sides, but this also tends to keep dust etc. inside the cover. Therefore, the dustproof performance cannot be said to be sufficient.

In view of these problems, the present invention improves the dustproof cover of the air breather, which normally prevents air from flowing between the outside air and the inside of the premises, and prevents it from deflecting only when the difference in air pressure between the outside air and the inside of the tank becomes considerably large. A lip-type air flow path that deforms to release the sealed state is provided in a location that does not interfere with the dustproof performance of the dustproof cover.

The gist of the present invention to achieve such objects and effects is to cover the upper air breather of the oil reservoir disposed within the hydraulic unit system with a dustproof cover made of an elastic material, and this dustproof cover: The air breather is provided so as to be sealed from the outside air by fitting its circumferential enlarged portion into an annular circumferential groove formed in the oil sump body or air breather, and a portion of the circumferential enlarged portion is deformed by air pressure. A reservoir cover for an oil sump tank is characterized in that a seal lip portion is formed to open an air flow path.

The present invention will be explained based on the embodiment shown in FIGS. 1 to 3. In the drawings, 1 is an oil reservoir constituting a part of a hydraulic unit system, 2 is a lid thereof, 3 is a sealing gasket, and 4 is a sealing gasket. The oil filled in the tank 1, 5 is a pump that sends the oil 4 out of the tank 1 through a path 6, 7 is a filter, and 8 is an oil filler port formed in the lid 2. As shown in the figure, an air breather 9 is tightly fitted.

This air breather 9 includes a main body 10 which has an air passage 11 in the center and whose outer periphery is tightly fitted into the fuel filler port 8, and an air passage 10 that is assembled to cover the opening of the air passage 11 to the outside. It is composed of a filter 12.

Reference numeral 14 denotes a hat-shaped dustproof elastic cover that wraps around the air filter 12 portion of the air breather 9, and has a cap-shaped elastic cover at its lower end that fits into the outer circumferential groove 13 formed in the air breather 9 and the main body 10. A portion 15 is formed, and a seal lip portion 16 is formed in a part of the circumferential enlarged portion 15, which contacts the bottom surface of the circumferential groove 13 only at the tip of the lip to form a seal.

This seal lip portion 16 is normally formed in the circumferential groove 13.
Either the seal part can be landed on the bottom surface of the tank to form a light air seal, or it can be provided so that only the bottom part of the seal part is exposed to the outside as shown in the figure, so that it is in contact with the bottom surface of the circumferential groove 13 in an almost natural state. When there is a difference in air pressure between the outside and the inside of the cover 14 due to an increase or decrease in the amount of oil inside the cover 1, the seal lip 16 is configured to flex and deform to intake or exhaust air.

According to such a configuration, even in a situation where it is necessary to use the dustproof cover in addition to the near reservoir 9, the area where the seal lip portion 16 is formed is limited to a very small part of the cover. Moreover, since it is located in a part where dust etc. are not likely to accumulate, the possibility of contamination of dust etc. The benefits above are extremely large.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which Fig. 1 is a schematic vertical sectional view showing the entire oil reservoir, Fig. 2 is an enlarged partial sectional view showing the near reservoir part, and Fig. 3 is a dustproof cover. In this figure, A is a longitudinal front view, the opening is a bottom view, C is an enlarged view of part A of A, Fig. 4 is a diagram showing an example of a conventional dustproof cover made of an elastic body, and Fig. 5 is a diagram showing an example of a dust-proof cover made of a conventional elastic body. It is a figure which shows the example of the dustproof cover of the conventional example of a type|form. 1...Oil sump tank, 2...Lid, 3...Packing, 4.
...Oil, 5...Pump, 6...Route, 7...Filter 8...Oil filler port, 9...Air breather, 10
...Main body, 11...Air flow path, 12...Air filter, 13...Peripheral groove, 14...Dust-proof cover, 15
... Ampullary part, 16... Seal lip part, 20.24
... Dustproof cover, 21 ... Tank, 22 ... Air breather, 23 ... Circumferential groove, 25 ... Opening, 26 ... Lip.

Claims (1)

[Scope of utility model registration request] A dust-proof cover made of an elastic body is covered with an upper air breather of an oil reservoir disposed in a hydraulic unit system, and this dust-proof cover has a peripheral enlarged portion fitted into an annular circumferential groove formed in the oil reservoir body or the air breather. The air breather is provided to be sealed from the outside air, and a part of the peripheral enlarged portion is formed with a seal lip portion that is deflected and deformed by air pressure to open an air flow path. reservoir cover.