JPH078929Y2 - Integrated oil seal - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a sealing material for sealing between mutually rotatable members, and more specifically, a combination type integrated type that generates a sealing force in a pair. It relates to an oil seal.

[Prior Art] Conventionally, most of integrated oil seals that are combined and have a sealing action have been developed for use in harsh places where a single seal cannot be satisfied, and therefore various shapes are used. Have been tried and implemented.

For example, as an oil seal used for a crankshaft of an engine or the like, as illustrated in FIG. 2, a seal body (8) having a side lip (7) and a side plate (9), as shown in FIG. The side lip (7)
It is known that the seal is brought into contact with the peripheral surface of the side plate to achieve a hermetic seal.

[Problems to be solved by the invention] However, the integrated oil seal in which the side lip (7) and the side plate (9) are combined causes most of the oil in the engine to be removed due to the effect of the side plate (9) being shaken off due to the rotation of the shaft. Since the side lip (7) does not even shake off and the lubrication of the sliding portion required by the side lip (7) is insufficient, heat generation and abnormal wear occur, and the seal life is greatly shortened. Further, in the assembling, since there are few parts related to each other in terms of shape, it is difficult to obtain the mounting accuracy, the assembling is troublesome, and the man-hours are large.

In view of such many drawbacks, the present invention has an object to provide a long-life integral type oil seal having good lip lubrication and high mounting accuracy.

[Means for Solving the Problem] As shown in FIG. 1, the present invention is mounted on a mutually rotating housing (1) and a shaft (2) such as an engine crankshaft and a housing block, and an oil lip. An integrated oil seal comprising a sealing element (4) having (3) and an auxiliary sealing ring (5), said auxiliary sealing ring (5)
Is formed to have a substantially U-shaped cross-section, and an outwardly extending flange portion (6) directed to the inner circumference is formed at the outer axial end thereof, and the other sealing element (4) is formed to have a substantially L-shaped cross-section and the outer peripheral surface thereof is formed. Is fitted into the housing (1), and an oil lip (3) is provided, which projects obliquely in the axial direction in the radial direction thereof, and the oil lip (3) is arranged in the radial inner circumference of the auxiliary sealing plate (5). The extended flange portion (6) is provided with the tip contact portion thereof by contacting the surface.
It is characterized in that it has a larger diameter than the tip diameter of.

[Operation] The present invention can bring about the following excellent operation by such a structure.

That is, the auxiliary seal ring (5) having a substantially U-shaped cross section which constitutes the integrated oil seal is provided with an extending flange portion (6) facing the circumferential direction at the outer axial end portion thereof. 6) acts together with the above-mentioned substantially U-shape to form a saucer-shaped reservoir (a) in the lower circular portion thereof, and when the engine is operating, the first
As shown in the figure, the oil that scatters inside the pool (a)
Acts as a reservoir. At this time, since the sliding contact of the oil lip (3) slidably contacting the radial portion of the auxiliary sealing ring (5) is arranged to be larger than the tip diameter of the extending flange portion (6), the sump portion is formed. A portion lower than the oil level accumulated in (a) is generated, and a part thereof is immersed in the oil, and the sliding portion of the oil lip (3) is always lubricated by the accumulated oil.

Of course, as for the sealing action against the outside, the sliding oil lip (3) performs its original function and exhibits a strong sealing force.

[Embodiment] In implementing the integrated oil seal of the present invention, an oil lip (3) that obliquely projects in the radial direction of the sealing element (4).
In addition to this, a radial lip (10) may be additionally provided. In this case, a dust lip (11) having a diameter larger than that of the radial lip (10) is provided at the end of the auxiliary sealing plate (5) on the inner peripheral side in the axial direction. By combining the above, it is possible to expect a dust intrusion from the outside and a strong separation preventing action, so that a preferable structure can be obtained in terms of the sealing function and the seal assembling work.

[Advantages of the Invention] With the structure of the present invention, it is possible to constantly supply an appropriate amount of lubricating oil required by the sliding oil lip (3) to prevent lip wear and prolong the life of the seal. Further, the outer surface of the auxiliary sealing plate (5) facing the inside of the engine has a function of shaking off the oil that is scattered and shows a good sealing property, and cooling of the radial portion is expected by this scattering, and a lip slide on the back surface thereof is expected. It can prevent the moving part from getting hot.

Further, since it is an integral type, it is easy to assemble, and it is possible to obtain the ones with high dimensional accuracy.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the integrated oil seal of the present invention. FIG. 2 is a sectional view of a conventional oil seal. a ... pool portion, 1 ... housing, 2 ... shaft, 3 ... oil lip, 4 ... sealing element, 5 ... auxiliary sealing plate, 6 ... extension flange portion, 10 ... radial lip, 11 ... dust lip.

Claims (1)

[Scope of utility model registration request] 1. An integral oil seal, comprising a sealing element (4) having an oil lip (3) and an auxiliary sealing ring (5), each mounted on a mutually rotating housing (1) and shaft (2). The auxiliary sealing ring (5) has a substantially U-shaped cross section, and an outwardly extending end portion of the auxiliary sealing ring (5) is formed with an extending flange portion (6), and the other sealing element (4) has a cross section. An oil lip (3) formed in a substantially L-shape and axially projecting in the radial direction of the sealing element (4) is disposed, and the oil lip (3) is arranged in the radial direction of the auxiliary sealing plate (5). An integrated oil seal, characterized in that when brought into contact with the inner peripheral surface, the tip contact portion has a diameter larger than the tip diameter of the extending flange portion (6).