| 摘要 |
A positive synchromesh gear device of the free ring type has, in the known way, two synchronizing rings which cooperate with respective frusto-conical coupling surfaces of a driving member and a free member respectively, the latter being rotatable on a driven member and permanently coupled by gearing to the driving member. A number of pins extend axially from each ring towards the other ring and pass through respective bores in a coupling member which is rotatable with but slidable axially on the driven member to connect the driven member selectively either to the driving member for direct drive or to the free member for drive through the gearing. Each pin has inner and outer cylindrical coaxial portions interconnected by a portion tapered towards the free end of the pin, and the pins are normally disposed in a rest position with their outer cylindrical portions within the respective bores of the coupling member. The invention provides a spring-biassed member in each pin, urged into frictional contact with the opposite ring to urge the two rings constantly apart into contact with the respective coupling surfaces, at the same time causing the first ring to tend to draw the second ring along in rotation with it, thereby keeping the outer cylindrical portion of each pin laterally in contact with part of the bore in the coupling member.
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