Patent ID: 7955204
Filing Date: 2011-06-07
Classification: F16H,H02K

Abstract:
1. A stepping motor cooling apparatus for a continuously variable transmission, comprising: a pair of primary and secondary pulleys disposed inside a transmission case; a forward/backward switching unit disposed coaxially to the primary pulley; a stepping motor disposed below the forward/backward switching unit and inside the transmission case; an inner case originating from the transmission case, a circumference of the forward/backward switching unit being surrounded by the inner case, a dripping hole being formed through the inner case at an inner case's portion directly above the stepping motor to allow working fluid drained from the forward/backward switching unit to drip on the stepping motor; a recess portion located directly below a portion of the stepping motor, wherein the recess portion is configured to retain the working fluid; a valve body disposed below the primary pulley; a shift control valve installed on an upper surface of the valve body, the shift control valve being disposed in a horizontal direction from a pulley follower fitted to a movable sheave of the primary pulley; a servo link extending in the horizontal direction, one end of the servo link being connected to the pulley follower and another end thereof being connected to the stepping motor, an approximately center portion of the servo link being coupled to the shift control valve; and a guide shaft disposed substantially parallel to a rotation axis of the primary pulley, the pulley follower being slidably supported by the guide shaft, wherein the stepping motor is attached on the upper surface of the valve body and is positioned adjacent to the shift control valve in the horizontal direction from the pulley follower, wherein the shift control valve, the stepping motor and the guide shaft are located to overlap with one another in the horizontal direction which is perpendicular to a dripping direction of the working fluid.