Patent ID: 8087503

Claim:
A clutch assembly connected between a motor and a wheel for a toy, the clutch assembly comprising: a first clutch driven by the motor and comprising an engaging end surface defining a center hole thereon; a second clutch comprising an engaging surface capable of detachably engaging with the engaging end surface of the first clutch, and a latching portion away from the engaging surface for latching with the wheel, wherein the latching portion comprises a non-circular radial cross section; a guide shaft, a spring, and a limiting element, wherein the second clutch further defining a stepped hole running through the second clutch with the axis thereof substantially perpendicular to the engaging surface thereof, the stepped hole comprising a first portion, a second portion along a direction away from the engaging surface and a stepped surface defined between the first portion and second portion; the guide shaft is disposed through the stepped hole and having an end thereof fixed in the center hole of the first clutch; the spring is sleeved on the guide shaft and being received in the second portion; the limiting element secured on the guide shaft and keeping the spring compressed between the limiting element and the stepped surface in the stepped hole; and a casing defining a receiving space for receiving the motor and the first clutch, and an opening permitting the second clutch to project out of the casing.