| 摘要 |
A brake (3) for a shaft (2), such as the output shaft of the motor (41) of a lawnmower(40), comprising a carrier (4) arranged to be fixed to the shaft (2) for rotation therewith; at least one coil spring (7) having coils (8); and a braking surface (5) arranged to be fixed so that theshaft (2) rotates relative to the braking surface (5), each coil spring (7) being mounted in the carrier (4) such that, as a rotational speed at which the carrier (4) is rotated by the shaft (2) increases, the coils (8) of the spring (7) move away from the shaft (2) and the braking surface (5) and, as the rotational speed at which the carrier (4) is rotated by the shaft (2) decreases, the coils (8) of the spring (7) move towards the shaft (2) and the braking surface (5) and come into contact with the braking surface (5) so as to exert a braking force on the shaft (2). |
