Power unit having cam chain tensioner pivot mechanism
AssigneeHonda Motor Co., Ltd.
InventorsYutaka INOMOTO, Koji KOBAYASHI, Keita SHIGEMATSU, Takamori SHIRASUNA
Life of this patent
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Abstract
A compact power unit with a sufficient clearance between a stud bolt and a fixing shaft of a cam chain tensioner pivot mechanism for supporting a cam chain tensioner guide. The power unit including a crankshaft, a stud bolt configured to fix a crankcase and a cylinder body to each other, a cam chain, a cam chain tensioner mechanism including a cam chain tensioner guide, and a cam chain tensioner pivot mechanism including a pivot plate, a fixing shaft, and a swinging shaft, the fixing shaft and the swinging shaft are arranged so as to straddle the axis of the stud bolt as viewed in the axial direction of the crankshaft.
Claims18
A power unit having a cam chain tensioner pivot mechanism, the power unit comprising:
- a crankcase;
- a cylinder body including a cylinder, said cylinder being operatively positioned within the crankcase;
- a crankshaft rotatably supported by the crankcase;
- a plurality of stud bolts configured to fix the crankcase and the cylinder body to each other;
- a cam chain driving sprocket disposed at one end portion of the crankshaft;
- a cam chain wound around the cam chain driving sprocket, the cam chain transmitting power to a valve gear;
- a cam chain tensioner mechanism including a cam chain tensioner guide providing a tension to the cam chain;
- and
- a cam chain tensioner pivot mechanism configured to swingably support the cam chain tensioner guide by a pivot plate fixed to the crankcase by a fixing shaft and a swinging shaft inserted through the cam chain tensioner guide;
- wherein, as viewed in an axial direction of the crankshaft, the fixing shaft and the swinging shaft are arranged so as to straddle an axis of at least one stud bolt of the plurality of stud bolts.
A power unit having a cam chain tensioner pivot mechanism, comprising:
- a crankcase;
- a crankshaft rotatably supported within the crankcase;
- a plurality of stud bolts for fixing the crankcase and a cylinder body to each other;
- a cam chain driving sprocket disposed at one end portion of the crankshaft;
- a valve gear;
- a cam chain wound around the cam chain driving sprocket, the cam chain transmitting power to said valve gear;
- a cam chain tensioner guide for providing a tension to the cam chain;
- and
- a cam chain tensioner pivot mechanism for swingingly supporting the cam chain tensioner guide by a pivot plate fixed to the crankcase by a fixing shaft and a swinging shaft inserted through the cam chain tensioner guide;
- wherein, as viewed in an axial direction of the crankshaft, the fixing shaft and the swinging shaft are arranged to straddle an axis of at least one stud bolt of the plurality of stud bolts.
A power unit having a cam chain tensioner pivot mechanism, comprising:
- a crankcase with a cylinder body being operatively positioned relative to the crankcase;
- a crankshaft rotatably supported by the crankcase;
- a plurality of stud bolts configured to fix the crankcase and the cylinder body to each other;
- a cam chain driving sprocket disposed at one end portion of the crankshaft;
- a cam chain wound around the cam chain driving sprocket, the cam chain transmitting power to a valve gear;
- a cam chain tensioner guide for providing a tension to the cam chain;
- and
- a cam chain tensioner pivot mechanism configured to swingably support the cam chain tensioner guide, said cam chain tensioner pivot mechanism including a pivot plate fixed to the crankcase by a fixing shaft and a swinging shaft inserted through the cam chain tensioner guide;
- said fixing shaft and the swinging shaft being arranged, when viewed in an axial direction of the crankshaft to straddle an axis of at least one stud bolt of the plurality of stud bolts.
Dependencies are inferred from the claim text.