Electronic throttle return spring assembly

摘要

Disclosed herein is a throttle return spring assembly for use in an electronic throttle unit having a throat and a valve rotatably fixed within the throat to close and open the throat. The throttle return spring assembly includes a shaft extending along a rotation axis and connected to the valve for opening and closing the throat of the throttle. A return spring has a first leg connected to the shaft and a second leg extending axially into an opening of a guide. The guide allows rotation of the return spring about the rotation axis and restricts lateral translation of the return spring. The guide has an arcuate inner radial wall defining a catch projecting radially inward. The return spring is wound by rotating the second leg to follow the arcuate surface and engage the catch. A special winding tool having a radial slot which engages the second leg can be piloted about the end of the shaft to wind the return spring. A dust cap covers the return spring and has an integral stop member to prevent the return spring from disengaging the catch and uncoiling.