KR0147718B1 - Oilseal of rotational shaft - Google Patents

Abstract

An object of the present invention is to provide an oil seal for sealing to seal the rotary shaft when the contact sealing force between the surface and the surface of the rotary shaft is lowered so that it can always maintain a constant sealing force.

Means of the present invention for achieving the above object is a circular reinforcement core of the U-shaped cross-section with the opening inward; A seal member in which the reinforcing iron core is embedded and an empty space portion is formed therein, and a portion formed in contact with the rotating shaft is formed of a plurality of oil lip having a pointed mountain shape; An air injection valve fixedly installed through one side surface of the reinforcing iron core on one side of the seal member to inject air into the space part from the outside; It consists of an air pressure regulating valve which is fixed to penetrate one side of the reinforcing iron core from the same circumferential surface on which the air injection valve is mounted so that the air in the space is opened above the reference pressure to discharge the air in the space. It is characterized by.

Description

Oil seal for sealing shaft

1 is a view showing an embodiment of the oil seal for sealing the rotary shaft of the present invention

2 is a view showing the structure of a conventional oil seal

* Explanation of symbols for main parts of the drawings

2: rotating shaft 4: oil seal

5: reinforcing iron core 6: rubber seal member

7 oil lip 8 space part

9: Air injection valve 10: Air pressure regulating valve

11 valve 12 plunger

13: compression spring 14: valve

15: Plunger 16: Compression Spring

17: groove 18: hole spring

[Industrial use]

The present invention relates to a sealing oil seal for preventing leakage of the rotating shaft that needs to be polished.

[Private Technology]

Generally, rotating shafts that require lubrication, such as engine crankshafts, transmission input and output shafts, transmission axles and rear axle shafts or oil pump shafts, prevent oil from leaking to the outside and at the same time receive external dust and dirt. The oil seal is fixed to prevent intrusion into the interior.

This oil seal maintains a high function to prevent leakage by holding the outer peripheral part of the shaft lightly while the parts are not in operation.However, when the shaft rotates, the temperature rises and internal pressure is formed so that the oil or air is blown out. When the force is generated and oil seals have the proper pressure to prevent leakage, oil leakage does not occur and the surface of the rotating part must be gripped with the proper force so that the wear of oil seal proceeds quickly. Accordingly, oil seal has high pressure resistance, temperature resistance, Various properties such as wear resistance and oil resistance are required.

The structure of the conventional oil seal wraps the outer circumference of the L-shaped reinforcing iron core 30 with rubber as shown in FIG. 2 and the contact portion with the central rotating shaft 31 is composed of one or two seal lips 32. It is. The seal lip 32 is a rubber blade that protrudes sharply in contact with the rotating shaft 31 in order to improve contactability, and a holding spring 33 is mounted between the two seal lip 32 so that the seal lip 32 is closed. Elasticity is applied to maintain contact.

In addition, the outer portion of the oil seal is formed with a rubber wing 35 of the function that prevents foreign matter from entering into the inside of the part from the outside, and the oil splashed from the inside of the part is directly in the oil seal inside the oil seal. An oil baffle 34 is installed to prevent spraying.

[Problems with Prior Art]

However, in the case of the oil seal of the above-described structure, the contact force with the surface of the external shaft along with the passage of time due to the increase of the temperature of the rotating part and the internal pressure, the insufficiency of preventing the oil splashing, and the machining failure or damage of the site where the oil seal is mounted. This becomes poor and the sealing ability is remarkably lowered, resulting in leaking oil. When continuous leaking occurs, there is a problem such as the parts being burned out due to lack of oil, noise, and parts contamination.

[Problem to Solve Invention]

Therefore, the present invention has been proposed in view of the above-mentioned problems, and its object is to provide a sealing oil seal which can always maintain a constant sealing force by restoring it when the contact sealing force between the surface of the rotating shaft is lowered. To provide.

[Means for solving the problem]

Means of the present invention for achieving the above object is a circular reinforcement core of the U-shaped cross-section with the opening inward; A seal member in which the reinforcing iron core is embedded and an empty space portion is formed therein, and a portion formed in contact with the rotating shaft is formed of a plurality of oil lip having a pointed mountain shape; An air injection valve fixedly installed through a reinforcing iron core on one side of the seal member to inject air into the space from the outside; It is composed of an air pressure regulating valve that is fixed through the reinforcing iron core from one side on the same circumferential surface on which the air injection valve is mounted so that the air in the space portion is opened above the reference pressure to discharge the air in the space portion. It features.

EXAMPLE

Hereinafter with reference to the accompanying drawings an embodiment of the present invention will be described in detail.

1 is a view showing an embodiment of a sealing oil seal of the present invention, wherein 1 is a body of an engine or a transmission, 2 is a rotating shaft, and 3 is a rotating shaft support bush or a bearing.

The oil seal 4 of the present invention is located outside the rotating shaft support bush 3 and prevents oil leaking through the support bush 3 from leaking to the outside.

The oil seal 4 has a circular reinforcement core 5 having a U-shaped cross section and an outer periphery of the reinforcement core 5, the opening of which is opposed to the inner side, that is, the rotating shaft 2, and the reinforcement core 5 is embedded therein. And a sealing member 6 therein.

The seal member 6 is made of rubber material, and a portion of the oil contact member 7, which is in the form of a sharp acid, protrudes in succession from two to five, for example. Since the oil lip 7 is sharply formed at the end, the oil lip 7 is in line contact with the outer circumferential surface of the rotation shaft 2 to increase the sealing force.

The outer side of the seal member 6 is equipped with an air injection valve 9 for injecting air into the space 8 from the outside, which is fixed to penetrate one side of the U-shaped reinforcement core (5) .

In addition, on the circumferential surface on which the air injection valve 9 is mounted, the air pressure regulating valve 10 is opened so as to be automatically discharged when the air pressure in the space 8 is greater than or equal to a reference value. The air injection valve 9 and the air pressure control valve 10 are screwed and fixed with a reinforcing iron core 5 made of metal.

The air injection valve (9) is composed of a valve (11), a plunger (12) for opening or closing the valve (11) and a compression spring (13) for elastically supporting the plunger (12). When injected, the plunger 12 retracts while compressing the spring 13 so that the valve 12 is opened so that the compressed air is filled into the space 8. When the air injection stops, the shot of the compression spring 13 is stopped. The plunger 12 returns by closing force to close the valve.

The air pressure regulating valve 10 is also composed of a valve 14, a plunger 15 and a compression spring 16 for supporting the plunger 15 in the same way, but the structure thereof is the same as that of the air injection valve 9, but When the air pressure in the space 8 is injected above a predetermined value by being mounted in the opposite direction, the plunger 15 moves while compressing the compression spring 16 to open the valve 14 and the open valve 14 When the excess pressure of air in the space portion 8 is discharged and the pressure is lowered to a certain pressure, the spring 14 is balanced and the valve 14 is closed again, so that the space portion 8 always maintains a constant pressure. I'm trying to.

The holding springs 18 formed so as to have elasticity by rolling coil springs roundly are engaged with the recesses 17 formed on the space portion 8 side of the plurality of oil lips 7 so that the oil lips 7 are always rotated ( An elastic force is applied to contact 2).

Here, reference numeral 19 denotes a dust strip that prevents ingress of foreign substances such as dust, reference numeral 20 denotes an inner baffle that blocks oil scattering, and reference numeral 21 denotes a stopper.

The sealing action by the oil seal of the above structure is as follows.

First, the rubber cap 22 of the air injection valve 9 is peeled off, and then the compressed air injector is connected to the air injection valve 9 to inject compressed air. When the high pressure compressed air acts on the plunger 12, the plunger 12 retreats while compressing the spring 13, opening the valve 11, and filling the compressed air in the space 8 to increase the internal pressure. . When the internal pressure of the space portion 8 becomes higher than the prescribed value, the plunger 15 of the air pressure regulating valve 10 retreats to open the valve 14, thereby releasing air into the atmosphere, and thus the pressure in the space portion 8. Will always remain constant.

Accordingly, the plurality of oil lip 7 acts to uniformly press the rotating shaft 2 with a constant force by the compressed air pressure acting in the space 8 together with the force held by the holding spring 18 so that the contact force is always uniform. This is ensured and the contact force is dropped again to increase the air pressure through the air injection valve (9) is to maintain a uniform sealing force to prevent leakage.

[Effects of the Invention ]

According to the present invention as described above, a plurality of oil lip surface of the rotating shaft by installing an air injection valve and an air pressure regulating valve to fill the air from the outside to provide a space in the oil seal and to maintain a proper pressure at all times By contacting with evenly to hold at the appropriate pressure to prevent leakage, thereby preventing wear damage and noise generation of the internal parts due to the lack of oil, and has the effect of preventing contamination by oil leakage.

Claims (4)

A circular reinforcement core having a c-shaped cross section in which the opening part faces inward; A seal member in which the reinforcing iron core is embedded and an empty space portion is formed therein, and a portion formed in contact with the rotating shaft is formed of a plurality of oil lip having a pointed mountain shape; An air injection valve fixedly installed through one side of the reinforcing iron core on one side of the seal member to inject air into the space part from the outside; And an air pressure regulating valve fixedly installed through one side of the reinforcing iron core from the same circumferential surface on which the air injection valve is mounted so that the air in the space is opened when the reference pressure is higher than the reference pressure. Sealing oil seal of the rotating shaft, characterized in that. The oil seal for sealing the rotating shaft according to claim 1, wherein the oil lip maintains a contact force to the rotating shaft by a holding spring provided inside the space. The air injection valve is an oil seal for sealing a rotary shaft, characterized in that consisting of a valve, a plunger for opening the valve by the air pressure from the outside, and a compression spring for the carbon springs in the direction to return the plunger to the original. 2. The air pressure regulating valve of claim 1, wherein the air pressure regulating valve includes a valve, a plunger which operates to discharge the air by opening the valve when the pressure in the space portion is equal to or greater than a reference value, and compression that supports the plunger in a direction in which the plunger is returned to its original position Sealing oil seal of the rotating shaft, characterized in that consisting of a spring.