Bicycle freewheel

A bicycle and flywheel technology, applied in the field of flywheels, can solve the problems of complicated assembly work and complicated structure of the one-way clutch, and achieve the effect of small clearance angle and simple internal structure.

Inactive Publication Date: 2007-04-25
SHIMANO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In the above-mentioned conventional flywheel, since the urging member is provided on each clutch claw, the structure tends to be complicated and the assembly work of the one-way clutch becomes complicated in the flywheel with large space constraints.

Method used

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Experimental program
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Effect test

Embodiment approach

[0061] (a) In the aforementioned embodiment, in order to maintain the necessary rigidity and reduce the clearance angle, the two clutch pawls 61 are simultaneously engaged with the ratchet teeth 60. However, in order to reduce the clearance angle, only one clutch pawl may be used. 61 meshes with ratchet teeth 60 .

[0062] In Fig. 7, the central angle β2 of the two adjacent clutch claws 61 rotating clockwise among the first to fourth clutch claws 61a to 61d is 75 degrees, and the first clutch claw 61a and the adjacent second clutch claw 61a rotating counterclockwise The central angle γ2 between the four clutch claws 61d (that is, the central angle γ2 between the first clutch claw 61a and the fourth clutch claw 61d without the second and third clutch claws 61b, 61c in between) is 135 degrees.

[0063] Of the first to fourth clutch claws 61 a to 61 d thus arranged, only one of the first to fourth clutch claws 61 a to 61 d meshes with the ratchet teeth 60 . That is, since the ce...

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PUM

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Abstract

A freewheel basically has an inner tubular member, and outer tubular member, at least one bearing assembly, and a one-way clutch. The inner tubular member is fixed to a hub body. The bearing assembly is arranged between the inner and outer tubular members to rotatably couple the outer tubular member to the inner tubular member. The one-way clutch has ratchet teeth provided on an internal circumferential surface of the outer tubular member, at least three clutch pawls provided on the outer side circumference of the inner tubular member in a circumferential direction, and at least one force applying member applying forces against at least two of the clutch pawls in a direction oriented away from the outer side circumference of the inner tubular member toward an engagement position. The clutch pawls are arranged such that an angle of lost motion of the freewheel is 10 DEG or less.

Description

technical field [0001] The invention relates to a flywheel, in particular to a bicycle flywheel installed on a bicycle wheel hub. Background technique [0002] On the driving side wheel of the bicycle, usually on the rear wheel, a flywheel is integrally or separately provided on the hub body, and the flywheel has a one-way clutch function that only transmits one-way rotational force. As a conventional flywheel, a flywheel having a claw-type one-way clutch having ratchet teeth and clutch claws meshing therewith is known. In the claw type one-way clutch, the clutch claw is urged toward the engagement position where it meshes with the ratchet teeth, and the engagement timing to the engagement position is delayed, that is, there is a so-called backlash angle. For example, if there is one clutch pawl and the center angle of adjacent ratchet teeth is 20 degrees, a clearance angle of at most 20 degrees is generated until the clutch pawl meshes with the ratchet teeth. [0003] In ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16D41/30
CPCF16D41/30
Inventor 金久隆则
Owner SHIMANO INC
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