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Sealing device

A technology of sealing device and sealing lip, which is applied in the direction of engine sealing, mechanical equipment, engine components, etc., can solve the problems of not being able to fully exert the effect of the screw pump, and achieve the effect of suppressing leakage

Pending Publication Date: 2021-10-22
NOK CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in this technology, since the screw protrusion 720 is separated from the surface of the shaft 500 before the sliding wear of the seal lip 700 progresses, a new problem arises that the original function of the screw pump effect cannot be fully exhibited.
Thus, there is still room for improvement

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0025] Hereinafter, modes for implementing the present invention will be described in detail based on examples with reference to the drawings. However, unless otherwise specified, dimensions, materials, shapes, relative arrangements, and the like of components described in the present examples are not intended to limit the scope of the present invention thereto. In addition, the sealing device according to the present embodiment can be suitably used for sealing fluids to be sealed, such as oil, in various devices such as robots and servo motors.

[0026] (Example)

[0027] refer to Figure 1 ~ Figure 3 , the sealing device according to the embodiment of the present invention will be described. figure 1 It is a partially broken sectional view of the sealing device according to the embodiment of the present invention. In addition, in figure 1 , shows a view in which a part of the sealing device is cut along a plane including the central axis of the sealing device in a stat...

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PUM

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Abstract

The present invention provides a sealing device capable of exhibiting a screw pump effect early while suppressing leakage, of a fluid to be sealed, caused by installation of screw projections. This sealing device is characterized in that: a second slope 212 is provided with a plurality of first screw projections 213 for causing a fluid to be sealed to flow toward a region to be sealed when a seal lip 210 rotates in one direction with respect to a shaft, and a plurality of second screw projections 214 for causing the fluid to be sealed to flow toward the region to be sealed when the seal lip 210 rotates in the other direction with respect to the shaft; and, in a state before sliding abrasion of the seal lip 210 progresses, the side wall of each of the first screw projections 213 on the region side to be sealed and the side wall of each of the second screw projections 214 on the region side to be sealed are designed to be parallel to the center axis of the shaft in a state where the seal lip 210 is in contact with the surface of the shaft.

Description

technical field [0001] The present invention relates to a sealing device provided with a screw protrusion that exerts the effect of a screw pump. Background technique [0002] In a sealing device such as an oil seal, in order to return the sealing target fluid leaked from the lip tip of the sealing lip to the side of the sealing target area, it is known that a sealing device is provided on an inclined surface on the opposite side of the sealing target area in the lip tip. Screw protrusions for screw pump effect. In addition, it is also known that, when the shaft is configured to rotate forward and reverse with respect to the sealing lip (sealing device), there are screw protrusions that exert the effect of the screw pump during forward rotation, and technologies that exert the effect of the screw pump during reverse rotation. Screw protrusions for screw pump effect. In such a technique, the screw protrusions for reverse rotation cause leakage during forward rotation, and t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16J15/3204F16J15/3244
CPCF16J15/3244F16J15/3204
Inventor 间中勇登
Owner NOK CORP