| 摘要 |
A gearbox for self-propelled machines such as lawn-mowers, comprising a frame within which are disposed a primary shaft (1) provided with a gear train (8) of this latter, and a secondary shaft (2) provided with a gear train (9) that is free about the secondary shaft (2). Each gear (8) of the primary shaft (1)is maintained in permanent engagement with a gear (9) of the secondary shaft (2). The primary shaft (1) is driven in rotation by an endless screw (7), in engagement with a toothed wheel (4), by a cone clutch whose cones (3) are mounted slidably upon and kinematically freely and come into engagement with the conical bearing surfaces of the driven member. The movement of rotation of the primary shaft (1) is transmitted to the secondary shaft (2) by a movable key (12) mounted on the secondary shaft.
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