JPH0729342Y2 - Oil seal - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an oil seal between a shaft and a housing, which shuts off the inside and the outside of the shaft. More specifically, the oil seal has greatly improved durability. The present invention relates to the improvement of the shape.

[Prior Art] Conventionally, an oil seal for sealing a rotating portion such as a shaft has a seal lip (2) formed of an elastic body such as synthetic rubber as shown in FIG. It is composed of a reinforcing ring (1) formed of a metal material that reinforces and fits and fixes this, and the seal lip (2) is in sliding contact with the rotating part to isolate the inside from the outside.

[Problems to be Solved by the Invention] However, such an oil seal which is sealed by the contact pressure of the seal lip (2) is protected by a thin lubricating film of oil formed between the lip sliding portion and the rotating portion. It is essential to supply oil (a) because it operates without wear, but an oil seal that does not have an oil supply function is used when starting from an engine stop or when it is used in an automobile, etc. Alternatively, when the vehicle travels in a curve, sufficient oil (a) may not be supplied to the seal lip (2) and the lubricating film may be interrupted. In such a case, wear may occur immediately and the life of the seal lip (2) may be significantly shortened or deteriorated. There is a risk that the sealing function itself may be lost.

In view of such drawbacks, the present invention has an object to provide an oil seal having a self-lubricating action and realizing a stable sealing action and strong durability.

[Means for Solving the Problems] The present invention, as shown in FIG. 1, includes an oil having a seal lip (2) including a reinforcing ring (1) and formed of an elastic body such as synthetic rubber or synthetic resin. An oil plate (3), which is a seal and is integrally attached to a fixed portion of the oil seal and extends in a radial direction to a vicinity of a sliding contact portion of the seal lip (2), is provided. It is characterized in that the radial portion of 3) is bent and shaped into a corrugated blade shape (4) in which irregularities are repeated.

[Operation] The present invention has the following excellent operation due to the above structure.

That is, when the engine is stopped, there is not enough oil (a) in the seal lip (2) of the oil seal and the oil is left unlubricated. However, as shown in FIG. An appropriate amount of oil (a) is stored inside the lower circle of the annular groove formed by the direction portion and the seal lip (2), and the blade shape (4) portion of the oil plate (3) that rocks when the engine is started is The accumulated oil (a) is vigorously agitated and scattered toward the seal lip (2) to immediately form a lubricating film. Even when this is used in an automobile engine in which a large inclination or oil bias occurs, the oil plate (3) of the blade shape (4) supplies the oil (a) stored inside by itself and is in a non-lubricated state. It works to prevent the oil seal from operating.

[Embodiment] In carrying out the oil seal of the present invention, the blade shape (4) provided on the oil plate (3) can be variously changed from the wave shape shown in FIG. 2 to the spiral shape or the annular uneven shape. The structure can be implemented, and it is also possible to incline the radial portion inward or outward to adjust the amount of oil (a) accumulated.

[Advantage of the Invention] According to the present invention, the seal lip (2) of the oil seal is always kept in a good lubrication state by the oil plate (3) and thus exhibits high durability. In particular, the supply effect plays a large role at the time of starting or when the oil (a) is offset.

Further, at the time of starting, there is a large shake or shake, and this swing vibration also assists the scattered supply action of the oil (a).

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the oil seal of the present invention. FIG. 2 is a side view showing an embodiment of the oil plate of the present invention. FIG. 3 is a sectional view showing a conventional oil seal. 1 ... Reinforcement ring, 2 ... Seal lip, 3 ... Oil plate, 4 ... Blade shape, a ... Oil

Claims (1)

[Scope of utility model registration request] 1. An oil seal having a seal lip (2) including a reinforcing ring (1) and formed of an elastic body; a peripheral portion of the seal lip (2) attached to a fixed portion of the oil seal. An oil seal characterized in that an oil plate (3) extending in the radial direction to the vicinity of the sliding contact portion is arranged, and the radial portion of the oil plate (3) is bent and formed into a corrugated blade shape (4).