초록 ▼

In an engine unit of a straddle type vehicle, a V-belt-type continuously variable transmission (CVT) has a secondary sheave shaft 62 that rotates with a clutch housing of a centrifugal clutch. The secondary sheave shaft is supported in a cantilever fashion via two bearings. The engine unit has a gea

In an engine unit of a straddle type vehicle, a V-belt-type continuously variable transmission (CVT) has a secondary sheave shaft 62 that rotates with a clutch housing of a centrifugal clutch. The secondary sheave shaft is supported in a cantilever fashion via two bearings. The engine unit has a gear that rotates with a clutch boss. Cage-and-roller needle bearings, which are a type of needle bearing, are inserted between the secondary sheave shaft and the gear. In this manner, without enlarging the engine unit, abrasions and deterioration of a bearing inserted between a rotational shaft supported in a cantilever fashion and a body of rotation are prevented.

대표청구항 ▼

The invention claimed is: 1. An engine unit comprising:a single rotational shaft arranged to be rotated by a drive force provided thereto, the single rotational shaft extending in a width direction of the engine unit;a first bearing into which the single rotational shaft is inserted;a secondary shea

The invention claimed is: 1. An engine unit comprising:a single rotational shaft arranged to be rotated by a drive force provided thereto, the single rotational shaft extending in a width direction of the engine unit;a first bearing into which the single rotational shaft is inserted;a secondary sheave including a fixed sheave and a movable sheave and arranged to be driven by a primary sheave, the secondary sheave being mounted to a first end portion of the single rotational shaft;a clutch mounted on the single rotational shaft via the first bearing and arranged closer to a center of the engine unit in the width direction of the engine unit than the first end portion of the single rotational shaft and the secondary sheave;a body of rotation into which the first bearing is inserted; anda second bearing into which the single rotational shaft is inserted, whereinthe single rotational shaft is supported in a cantilever fashion via the second bearing;the first bearing is a needle bearing; andthe first bearing is positioned between two second bearings juxtaposed to each other in an axial direction of the single rotational shaft.