Bearing structure

Abstract

The present invention is intended to provide a bearing structure in which a reference side bearing portion and an aligning side bearing portion can be installed with axial centers nearly aligned to each other even when the axial center of rotary shaft is inclined, and it is possible to obtain smooth and stable rotation for a long consecutive period of time. Left cup 7 of the bearing structure is axially moved so that ball 9a . . . held on holding ring 9b of aligning side bearing portion 9 is abutted on left-hand flange 4a of crank shaft 4, and also, holding ring 9b is spherically adjusted along the spherical surface of left cup 7, and the bearing center of all ball 9a . . . held on holding ring 9b is automatically aligned so as to be nearly aligned to the axial canter of crank shaft 4 which bears on reference side bearing portion 8, thereby displaying a bearing function while assuring smooth and stable rotation.

Description

technical field [0001] The present invention relates to a bearing structure for pivotally supporting, for example, a crank shaft and a handle shaft constituting a bicycle, a hub shaft, a pedal shaft, or a rotating shaft constituting a machine or mechanism. Background technique [0002] Conventionally, as the above-mentioned bearing structure, there is a bearing structure of Patent Document 1 (Japanese Patent Application Laid-Open No. 2003-300494 ), that is, for example, a right joint and a left joint are fixed to a hanger collar constituting a hanger portion of a bicycle. At both ends, the crankshaft is rotatably supported by bearings incorporated in the right joint and the left joint. [0003] However, once the assembly accuracy of the joint fixed in the above-mentioned hanger collar is low, the rotation center of the bearing installed in the joint is installed in an inclined state with respect to the axis of the crankshaft. The rotational resistance and the contact resist...

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Problems solved by technology

[0003] However, once the assembly accuracy of the joint fixed in the above-mentioned hanger collar is low, the rotation center of the bearing installed in the joint is installed in an inclined state with respect to the axis of the crankshaft. The rotation resistance and contact resistance of the ball increase, so the rotation of the crankshaft becomes poor

In addition, the noise generated during rotation increases, and looseness is likely to occur due to vibration and impact generated during the rotation of the crankshaft, which may cause failure, damage, accidents, injuries, etc.

[0004] In addition, in the case of a bearing structure in which a crankshaft is directly supported by a plurality of balls, once the bearing centers of all the balls held inside the joint are installed in an inclined state with respect to the axis of the crankshaft, the rotational stress of the crankshaft It acts directly on a part of the sphere, so it is prone to breakage and damage, and it is difficult to obtain smooth and stable rotation for a long time

In addition, when the pair of left and right bearings and the crankshaft are unitized and assembled, the number of parts constituting the bearing structure and the number of assembly man-hours increase, not only the assembly work is troublesome and time-consuming, but also the manufacturing cost increases.

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