Engine unit and straddle type vehicle
AssigneeYamaha Hatsudoki Kabushiki Kaisha
InventorsAkifumi Oishi, Yousuke Ishida
Life of this patent
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Abstract
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.
Claims18
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;
- and
- a second bearing into which the single rotational shaft is inserted, wherein
- the single rotational shaft is supported in a cantilever fashion via the second bearing;
- the first bearing is a needle bearing;
- and
- the first bearing is positioned between two second bearings juxtaposed to each other in an axial direction of the single rotational shaft.
Dependencies are inferred from the claim text.