Bearing with magnetic fluid seal and fishing reel with same

Abstract

The present invention provides a bearing with a magnetic fluid seal and a fishing reel with the bearing, which can achieve low torque without impairing the waterproof and dustproof functions. In the bearing having the magnetic fluid seal of the present invention, annular magnets are arranged on the opening sides of the inner ring and the outer ring to hold the magnetic fluid and seal the plurality of rolling elements. The magnet is magnetized so that the magnetic poles are oriented in the axial direction, and includes an annular outer pole plate and an annular inner pole plate that sandwich the annular magnet and have one of the inner ring and the outer ring as the fixed side and the other as the gap side, The magnetic fluid on the outer ring side is held in at least one of between the outer ring and the outer pole plate, between the outer ring and the inner pole plate, and between the outer ring and the magnet; and the magnetic fluid on the inner ring side, It is held at one or more places among the inner ring and the outer pole plate, between the inner ring and the inner pole plate, and between the inner ring and the magnet.

Description

technical field [0001] The present invention relates to a bearing provided with a magnetic fluid seal, which is disposed in various driving force transmission mechanisms, rotatably supports a rotating shaft, and prevents dust, moisture, etc. from entering the inside. In addition, the present invention relates to a fishing reel having the bearing with the magnetic fluid seal in a supporting member of a rotating shaft of a driving force transmission mechanism. Background technique [0002] In general, rotating shafts provided in various driving force transmission mechanisms are rotatably supported by bearings. At this time, a so-called ball bearing in which a plurality of rolling elements (rolling elements) are accommodated in the circumferential direction between an inner ring and an outer ring is often used as a bearing, thereby improving the rotational performance of the rotating shaft. [0003] Bearings as described above are used as support mechanisms for supporting the ...

AI Technical Summary

Problems solved by technology

At this time, if the gap between the pole plate and the inner ring (or outer ring) is narrowed, although the magnetic force of the formed magnetic circuit becomes stronger and the holding capacity of the magnetic fluid is improved (the sealing effect is improved), the effect of bringing the inner ring closer The force also increases accordingly, thereby increasing the load on the rolling elements (rolling elements) and increasing the torque

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