| 摘要 |
The invention provides a shaft for a roller wheel which is excellent in strength and can achieve a weight saving. The invention provides a shaft for a roller wheel which rotatably supports a roller ( 3 ) outward fitted between both end portions ( 5 a, 5 b) in a state in which both end portions ( 5 a, 5 b) are fixed, and receives a load in a diametrical direction via the roller ( 3 ). Recess portions ( 6, 6 ) are provided on a side to which the load is not applied, on an outer peripheral surface corresponding to the roller ( 3 ). The load applying direction is a vertical direction. A cross sectional shape of the shaft in the recess portions ( 6, 6 ) is formed in a shape which is constituted by an upper circular arc portion ( 10 ) on an upper side, a lower circular arc portion ( 11 ) on a lower side, and a vertical connection portion ( 12 ) passing through a shaft axis (O) and connecting the upper circular arc portion ( 10 ) to the lower circular arc portion ( 11 ).
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