| 摘要 |
The wheel body is metal or other inflexible material. The smooth hub (1), (i.e. initially with no teeth) and edge discs (3) (or flanges) are formed as a unit. The central bore (4) accepts a shaft or an expansive bush coupling. The hub outer diameter is the denticulation root diameter. A molding pattern (5), strongly resembling a section of the timing belt to be used, is obtained. The wheel body is metal or other inflexible material. The smooth hub (1), (i.e. initially with no teeth) and edge discs (3) (or flanges) are formed as a unit. The central bore (4) accepts a shaft or an expansive bush coupling. The hub outer diameter is the denticulation root diameter. A molding pattern (5), strongly resembling a section of the timing belt to be used, is obtained. Its denticulation corresponds in number (and spacing) with that required on the wheel. The pattern both starts and ends at a half-tooth. Gaps between teeth of the pattern are filled with duroplastic up to the height of the teeth. This material is self-hardening and adheres to the wheel body, but not to the pattern. The pattern is laid gently onto the hub, its length corresponding to the hub circumference. The half-teeth meet at the ends of the pattern, forming a complete tooth. The pattern is located by a clamp (8, 9) resembling a Jubilee clip. Following hardening, clamp and pattern are removed.
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