Patent ID: 7891262

Claim:
A transmission for a vehicle, comprising: a gear shifting mechanism in which a plurality of selectively establishable gear trains for respective speed steps are provided between a speed change input shaft and a speed change output shaft; a clutch adapted to switch between connection and disconnection of power transmission between a power source output shaft and the speed change input shaft; a shift drum turnably carried by an engine case so as to selectively establish the gear trains in response to a turning position; a shift spindle turnably attached to the engine case so as to turn in response to a shifting operation; shifting position changing drive means having an arm member being capable of turning around an axis of the shift spindle for enabling to drivingly turn the shift drum in response to turning of the shift spindle; a turning member secured to the shift spindle and projectingly provided with a pressing member; a lost motion spring in which gripping portions gripping the pressing portion from both sides are provided at both sides of a coil portion surrounding the shift spindle; wherein the arm member is provided with a pressure-receiving member which is gripped by both the gripping portions in such a manner that when the turning member is turned, if, in response to the turning direction, the pressing portion abuts against one of both the gripping portions for turning, the other of the gripping portions abuts against the pressure-receiving member; a shift cover mounted to the engine case to define an operational chamber between the engine case and the shift cover, the operational chamber accommodating a portion of the shift spindle, the turning member, the lost motion spring and the shift position changing drive means; and a turning member turning-amount detecting means for detecting a turning amount of the turning member, said turning member turning-amount detecting means being secured to the shift cover.