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Sealing device

A sealing device and auxiliary lip technology, which is applied in the direction of engine sealing, mechanical equipment, engine components, etc., can solve the problems of unevenness and long-term stability of the sealing performance of the sealing device

Active Publication Date: 2020-04-10
NOK CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, the amount of grease G applied to the inner peripheral surfaces of both the main lip 712a and the auxiliary lip 722a becomes uneven in the circumferential direction.
Therefore, the sliding wear of the main lip 712a and the auxiliary lip 722a may proceed early in the portion where the amount of grease G applied is small, and the sealing performance of the sealing device may not be stabilized for a long period of time.

Method used

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  • Sealing device
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Examples

Experimental program
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Effect test

Embodiment 1

[0032] refer to figure 1 and figure 2 The sealing device according to Embodiment 1 of the present invention will be described. figure 1 It is a schematic cross-sectional view of the sealing device according to Embodiment 1 of the present invention. figure 2 It is a schematic cross-sectional view of the sealing structure according to Example 1 of the present invention. The sealing device according to this embodiment has a substantially rotationally symmetrical shape. exist figure 1 and figure 2 The middle diagram shows a cross-sectional view of the sealing device cut on a plane including the central axis of the sealing device.

[0033]

[0034] refer to figure 2 A sealing structure to which the sealing device (oil seal) according to the present embodiment is applied will be described. The sealing device according to this embodiment can preferably be used to seal the annular gap between the relatively rotating shaft and the casing in a reducer, a servo motor, and...

Embodiment 2

[0045] image 3 The middle figure shows Embodiment 2 of the present invention. In the first embodiment described above, the configuration in which the seal body portion of the auxiliary seal is provided with the auxiliary lip-side annular protrusion is shown. On the other hand, in this embodiment, instead of providing the auxiliary lip-side annular protrusion, a configuration in which the main lip-side annular protrusion is provided in the seal body portion of the main seal is shown. The other structures and functions are the same as in Embodiment 1, so the same components are assigned the same symbols and their descriptions are appropriately omitted.

[0046] image 3 It is a schematic cross-sectional view of a sealing device according to Example 2 of the present invention. The sealing device according to this embodiment has a substantially rotationally symmetrical shape. In addition, in image 3 The middle diagram shows a cross-sectional view of the sealing device cut o...

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PUM

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Abstract

Provided is a sealing device with which the amount of grease applied to the inner peripheral surface of both a main lip and an auxiliary lip can be made uniform in the circumferential direction. A sealing device 10 comprises a main lip 122 that can freely slide relative to a shaft, an auxiliary lip 221 that is provided more toward the side of a fluid to be sealed than the main lip 122, and that can freely slide relative to the shaft, and a grease G that is applied to the inner peripheral surface of both the main lip 122 and the auxiliary lip 221, wherein the sealing device is characterized bycomprising an auxiliary lip-side annular projection 222 that extends from the auxiliary lip 221 side toward the main lip 122 side up to a position at which the projection does not contact the main lip122, and that restricts the grease G from penetrating to the outside in the radial direction.

Description

technical field [0001] The invention relates to a sealing device for sealing an annular gap between a shaft and a casing. Background technique [0002] Oil seals (sealing devices) used in reducers, etc., are equipped with auxiliary lips in addition to the sealing lip (main lip) to prevent wear of the sealing lip caused by metal powder mixed in lubricating oil and grease . refer to Figure 4 The sealing device related to the conventional examples will be described. Figure 4 It is a schematic cross-sectional view of the sealing device involved in the existing example. [0003] A sealing device 700 according to a conventional example includes a main seal 710 and an auxiliary seal 720 . The main seal 710 includes a reinforcement ring 711 and a seal body portion 712 made of a rubber-like elastic body integrally provided with the reinforcement ring 711 . Also, a main lip 712a that is freely slidable with respect to the shaft is provided on the seal body portion 712 . Furtherm...

Claims

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Application Information

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IPC IPC(8): F16J15/3232F16J15/3256
CPCF16J15/3232F16J15/324
Inventor 相原孝行
Owner NOK CORP