High-pressure fuel pump
AssigneeHonda Motor Co., Ltd.
InventorsHiroatsu Inui, Noriaki Okano, Takayuki Konuma
Life of this patent
Estimating the term…
Abstract
In a reciprocating high-pressure fuel pump that operates a plunger while facing a cam ridge of a plunger driving cam provided on a camshaft to which power of a crankshaft of an internal combustion engine is transmitted, the cam ridge includes a cam curved surface including two apexes at a cam angle interval of 180° and two valley bottoms at a cam angle interval of 180° and alternately connecting the apexes and the valley bottoms, and a crossing angle between a first virtual line connecting the two apexes and a second virtual line connecting the two valley bottoms is not a right angle as viewed in a direction of a camshaft axis.
Claims16
A high-pressure fuel pump of a reciprocating type that operates a plunger while facing a cam ridge of a plunger driving cam provided on a camshaft to which power of a crankshaft of an internal combustion engine is transmitted, wherein
- the cam ridge includes a cam curved surface including two apexes at a cam angle interval of 180° and two valley bottoms at a cam angle interval of 180° and alternately connecting the apexes and the valley bottoms, and has a crossing angle that is not a right angle as viewed in a direction of a camshaft axis, the crossing angle being an angle between a first virtual line connecting the two apexes and a second virtual line connecting the two valley bottoms, and
- the cam ridge has an ascending-side cam angle larger than a descending-side cam angle in a predetermined rotation direction.
A high-pressure fuel pump of a reciprocating type that operates a plunger while facing a cam ridge of a plunger driving cam provided on a camshaft to which power of a crankshaft of an internal combustion engine is transmitted, wherein
- the cam ridge includes a cam curved surface including two apexes at a cam angle interval of 180° and two valley bottoms at a cam angle interval of 180° and alternately connecting the apexes and the valley bottoms, and has a crossing angle that is not a right angle as viewed in a direction of a camshaft axis, the crossing angle being an angle between a first virtual line connecting the two apexes and a second virtual line connecting the two valley bottoms, and
- the high-pressure fuel pump has the plunger driving cam provided coaxially with a valve camshaft of a valve train provided in an upper portion of a cylinder unit of the internal combustion engine.
Dependencies are inferred from the claim text.