| 摘要 |
Motorcar wheels being mounted in a vertical position on rotation hubs (6) of wheel balancing machines are guided into an accurately centered position by means of cooperating conical portions on the hub and on the wheel, but nevertheless it can be observed that the centering is not entirely correct, because the wheel "pulls downwardly" due to the gravity. According to the invention this effect is counteracted by placing the wheel on a support member (22) of an auxiliary apparatus (18) adapted to provide an air spring underneath the support member to the effect that the air spring equalizes the gravity of the wheel, such that the wheel be freely movable in a "weightless" condition a certain distance up and down. Thus, the wheel can easily be height adjusted to assume its mounting level, and by its final tightening to the hub the wheel will still be "weightless", whereby it will be very accurately centered. Moreover, the auxiliary apparatus can be arranged so as to be horizontally displaceable, such that it can be used also for bringing the wheel (8) onto the carrier hub (6). Preferably use is made of a permanent air spring and of power driven means (62, 64) for temporarily pressing down the support member (22) to a lower receiving and delivering position of the wheels. |
