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Sealing device and hydraulic cylinder

A technology of sealing device and sealing lip, which is applied to the sealing of engines, fluid pressure actuators, cylinders, etc.

Active Publication Date: 2013-06-12
NOK CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] Therefore, it is preferable to pull the oil toward the first sealing area O side through the annular protrusion 121a, but it may cause the oil to be sent out to the second sealing area G side through the annular protrusion 122a.

Method used

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  • Sealing device and hydraulic cylinder
  • Sealing device and hydraulic cylinder
  • Sealing device and hydraulic cylinder

Examples

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Effect test

Embodiment Construction

[0075] Hereinafter, specific embodiments of the present invention will be described in detail based on examples with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the structural members described in the examples are not intended to limit the scope of the present invention to these unless otherwise specified.

[0076] (Example)

[0077] refer to Figure 1 to Figure 6 , the sealing device and the hydraulic cylinder according to the embodiment of the present invention will be described.

[0078]

[0079] refer to figure 1 , the structure of the hydraulic cylinder according to the embodiment of the present invention will be described. In addition, here, as an example, a case where a hydraulic cylinder is applied to a crusher will be described as an example. figure 1 It is a schematic cross-sectional view of a crusher to which a hydraulic cylinder according to an embodiment of the present invention is applied. ...

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Abstract

A sealing device in which gas leakage to a first sealing region in which liquid is sealed is prevented and liquid leakage to a second sealing region in which gas is sealed is more reliably prevented. In the sealing device (50), nitrogen gas leakage to the first sealing region (O) is prevented and oil leakage to the second sealing region (G) is prevented. The shape of the tip of a first seal lip (51) provided on the first sealing region (O) side and the shape of the tip of a second seal lip (52) provided on the second sealing region (G) are formed such that the thickness of an oil film formed at a sliding portion between the first seal lip (51) and the surface of a piston (32) when the former slides on the latter is less than the thickness of an oil film formed at a sliding portion between the second lip (52) and the surface of the piston (32) when the former slides on the latter.

Description

technical field [0001] The present invention relates to a sealing device and a hydraulic cylinder that prevent gas from leaking to a first sealing area where liquid is sealed and liquid from leaking to a second sealing area where gas is sealed. Background technique [0002] For example, among hydraulic cylinders used in crushers, some hydraulic cylinders have a sealing area (first sealing area) in which liquid such as oil is sealed and a sealing area (second sealing area) in which gas such as nitrogen is sealed. Such a hydraulic cylinder is provided with a sealing device that simultaneously seals the first sealing area and the second sealing area. refer to Figure 7 as well as Figure 8 A conventional example of such a sealing device will be described. Figure 7 It is a schematic cross-sectional view of the sealing device according to Conventional Example 1. Figure 8 It is a schematic cross-sectional view of a sealing device according to Conventional Example 2. [0003] ...

Claims

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Application Information

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IPC IPC(8): F16J15/18F16J15/32F15B15/14F16J15/3236
CPCF16J15/3208F15B15/14F16J15/3232F15B15/1461F16J10/00F16J15/10
Inventor 若菜岳史平野学但野光前田敏行
Owner NOK CORP
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