Engine

Abstract

It is an object of the invention to provide an engine, which can be decreased in height while the strength of a cylinder head is ensured. An engine 11 according to the invention is constructed such that a cam chain 19 is trained around a sprocket 17 fixed to a camshaft 16, a roof wall 13c of an accommodation chamber 13b, which accommodates therein the sprocket 17, is formed integral with a cylinder head 13, an opening 13h is formed on an upper surface of the cylinder head 13 to be adjacent to the roof wall 13c, and intake and exhaust valves 22, 23 face outside from the opening 13h, and that an opened surface of the opening 13h is positioned in a lower position than an upper end of the roof wall 13c and formed on the same plane.

Description

technical field [0001] The present invention relates to an engine in which a rotating member such as a sprocket or the like is fixed to a camshaft provided on one side of a cylinder head. Background technique [0002] Conventionally, for an engine, the cylinder head is clamped and fixed to the upper part of the cylinder block by a plurality of clamping bolts, the piston is arranged in the cylinder body to be able to reciprocate, and the intake valve and the exhaust valve are provided to open and close by the piston, the cylinder The combustion chamber defined by the body, cylinder head, etc., is provided with a rocker arm to push the valve. [0003] In addition, a camshaft for driving a rocker arm is provided on the cylinder head, a sprocket is provided on the camshaft, and a drive force from the crankshaft is transmitted to the sprocket. Openings are formed in the cylinder head to expose intake valves, exhaust valves, and sprockets to the outside, and a cylinder head cover...

AI Technical Summary

Problems solved by technology

[0004] However, according to this conventional engine, since a large opening is formed on the cylinder head so that the intake valve, the exhaust valve, and the sprocket are exposed to the outside, the strength decreases, and a separate reinforcement plate is installed above the opening and further on the In the case of installing the cylinder head cover on the reinforcement plate, the number of parts increases and the height of the engine increases

[0005] In addition, since the openings for exposing the intake and exhaust valves to the outside are formed at two positions and are inclined in different directions, the formation of the openings is very difficult.

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