| 摘要 |
A crankshaft having counterweights (12) is balanced by adding additional weight to the latter without modifying their outer dimensions. Bores (14) are drilled into the counterweights (12) and then a slug (16) of material which is of a different density than the original counterweight material is inserted into the drilled bore (14). The bore (14) is drilled oversize so that the slug (16) can be accomodated entirely within it, and the slug (16) is disposed at such a position within the bore (14) that substantial balance is achieved without the need for any further step. The slug (16) may be held in place by any suitable means, e.g., press-fitting, upset fitting, welding or threading. With threading it is particularly easy to screw the slug (16) into the bore (14) so that it is positioned highly accurately for the appropriate balance. |
