Valve gear and engine
AssigneeYamaha Hatsudoki Kabushiki Kaisha
InventorYasuo OKAMOTO
Life of this patent
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Abstract
An engine includes a cylinder head including a first oil path and a second oil path. The cylinder head includes a valve gear including a first support and a second support that support a rocker shaft. The first support includes, on its outer surface, a first constriction located at an inlet of a connection-switching third oil path and connected to the first oil path, and a second constriction connected to the second oil path. The second support includes, on its outer surface, a third constriction connected to the first oil path, and a fourth constriction located at an inlet of a lubrication fourth oil path and connected to the second oil path.
Claims11
A valve gear for a cylinder head including a first oil path and a second oil path, the valve gear comprising:
- a rocker shaft;
- a first support that supports a first end region of the rocker shaft;
- a second support that supports a second end region of the rocker shaft;
- a rocker arm including a first arm portion supported pivotably by the rocker shaft and pivoted by a cam, and a second arm portion supported pivotably by the rocker shaft to drive a valve;
- a switch provided in the rocker arm to hydraulically connect and disconnect the first arm portion and the second arm portion to/from each other;
- a third oil path extending through the first support, the rocker shaft, and the rocker arm to the switch to supply a hydraulic pressure to the switch;
- and
- a fourth oil path extending through the second support and the rocker shaft to a region between the rocker shaft and the rocker arm to lubricate areas between the cam and the rocker arm;
- wherein
- the first support includes, on its outer surface, a first concave portion located at an inlet of the third oil path and to connect to the first oil path, and a second concave portion to connect to the second oil path;
- and
- the second support includes, on its outer surface, a third concave portion to connect to the first oil path, and a fourth concave portion located at an inlet of the fourth oil path and to connect to the second oil path.
Dependencies are inferred from the claim text.