Sprocket trimming method for the multi-stage sprocket assembly

Gear cutting – milling – or planing – Gear cutting – Using rotary cutter

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Details

409 8, 409131, 451 47, 474152, 474160, B23F 520

Patent

active

058761594

ABSTRACT:
A sprocket trimming method for a multi-stage sprocket assembly is disclosed which includes the steps of: (1) aligning the two sprockets at a gear shift position where a chain is escaping from one sprocket and engaging with another sprocket and is being tilted at a tilting angle; (2) using a computer aided design simulation to simulate how the gear shift operation is taking place and thus identify the portion of the sprocket tooth that will be overlapped and/or interfered with the chain when the chain is moved from an escaping sprocket tooth to an engaging sprocket tooth; and (3) trimming the overlapping and interference portion of the sprocket teeth to a depth according to the following equation: ##EQU1## wherein: D is the depth of the overlapping and interference portion of the sprocket teeth to be trimmed, w is the pitch width of the chain, Lc is the pitch length of the chain, .theta. is the tilting angle of the chain at gear shift position, Ts is the thickness of the sprocket of a smaller diameter, Sg is the distance between the two sprockets. The trimming allows the gear shift operation to be performed without the chain interfering with the sprocket teeth located between the escaping and engaging teeth.

REFERENCES:
patent: 3796106 (1974-03-01), Fisher et al.
patent: 3875846 (1975-04-01), Stockl
patent: 3968995 (1976-07-01), Arentzen
patent: 4392841 (1983-07-01), Juy
patent: 4610576 (1986-09-01), Erhardt
patent: 5188569 (1993-02-01), Kobayashi
patent: 5437582 (1995-08-01), Romano
patent: 5545096 (1996-08-01), Su

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