Sealing ring

A sealing ring and dynamic pressure technology, which is applied to the sealing of the engine, engine components, mechanical equipment, etc., can solve the problems of fluid leakage and increased leakage, and achieve the effects of suppressing leakage and reducing rotational torque
CN107407418AActive Publication Date: 2017-11-28NOK CORP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NOK CORP
Publication Date
2017-11-28

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Abstract

Provided is a sealing ring that suppresses leakage of a fluid to be sealed and that is capable of stably reducing rotational torque. A sliding surface side is provided with a groove portion (120) that comprises a first groove (121) extending in the circumferential direction and a second groove (122) that extends from a central position of the circumferential direction in the first groove (121) to an inner circumferential surface and that guides the fluid to be sealed into the first groove (121), characterized in that the first groove (121) comprises a groove for generating dynamic pressure (121a) formed such that the groove bottom is shallower in the end portions of the circumferential direction when compared to the center of the circumferential direction and a groove for capturing foreign objects (121b) capable of capturing foreign objects, the groove bottom of which is deeper than the groove bottom of the groove for generating dynamic pressure (121a), and in that the first groove (121) is provided in a position fitting into a sliding region that slides with respect to a side wall surface.
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Description

technical field

[0001] The invention relates to a sealing ring for sealing an annular gap between a shaft and a casing. Background technique

[0002] In Automatic Transmission (AT) or Continuously Variable Transmission (CVT) for automobiles, etc., there is a sealing ring for sealing the annular gap between the relatively rotating shaft and the housing to maintain oil pressure. In recent years, due to the promotion of low fuel consumption as a countermeasure against environmental problems, the demand for reducing the rotational torque in the above-mentioned seal rings is increasing. Conventionally, a technique of providing a groove for introducing a fluid to be sealed to the sliding surface side of the seal ring to generate dynamic pressure is known (see Reference 1). However, with this technology, when foreign matter is contained in the fluid to be sealed, the foreign matter will be stuck in the groove, which will not only reduce the effect of dynamic pressure and result in...

Claims

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