Tapered engine exhaust valve
AssigneeCaterpillar Inc.
InventorsRachel M. Goldman Taylor, Adam D. Patrick, James D. Peltier, Abram M. Ingold
Life of this patent
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Abstract
An exhaust valve for an internal combustion engine may comprise a body, including an upper portion, a lower portion, and a tapered portion between an upper end and a lower end of the body, wherein a ratio of (a) a length between an upper end of the upper portion and an upper end of the tapered portion to (b) a length between the upper end of the upper portion and a lower end of the tapered portion is in a range of 0.73 to 0.76, and a taper of the tapered portion is in a range of 0.0012/mm to 0.0030/mm. The exhaust valve may also comprise a head portion extending from a bottom of the lower portion of the body.
Claims20
An exhaust valve for an internal combustion engine, the exhaust valve comprising:
- a body, including an upper portion, a lower portion, and a tapered portion between an upper end and a lower end of the body, wherein a ratio of (a) a length between an upper end of the upper portion and an upper end of the tapered portion to (b) a length between the upper end of the upper portion and a lower end of the tapered portion is in a range of 0.73 to 0.76, and a taper of the tapered portion, measured as a difference between a maximum diameter of the tapered portion and a minimum diameter of the tapered portion, divided by a length of the tapered portion, is in a range of 0.0012/mm to 0.0030/mm;
- and
- a head portion extending from a bottom of the lower portion of the body.
An exhaust valve for an internal combustion engine, the exhaust valve comprising:
- a body including an upper portion, a lower portion, and a tapered portion between an upper end and a lower end, wherein a ratio of (a) a length between an upper end of the upper portion and an upper end of the tapered portion to (b) a length between the upper end of the upper portion and a lower end of the tapered portion is in a range of 0.77 to 0.79, and a taper of the tapered portion, measured as a difference between a maximum diameter of the tapered portion and a minimum diameter of the tapered portion, divided by a length of the tapered portion, is in a range of 0.0012/mm to 0.0031/mm;
- and
- a head portion extending from bottom of the lower portion of the body,
- wherein the exhaust valve is formed of one or more alloys, each alloy being selected from the group consisting of:
- 23-8N, an Inconel® alloy, and SIL1.
A method of manufacturing an exhaust valve for an internal combustion engine, the method comprising:
- forging an exhaust valve to have:
- a body, including an upper portion, a lower portion, and a tapered portion between an upper end and a lower end, wherein a ratio of (a) a length between an upper end of the upper portion and an upper end of the tapered portion to (b) a length between the upper end of the upper portion and a lower end of the tapered portion is in a range of 0.73 to 0.76, and a taper of the tapered portion, measured as a difference between a maximum diameter of the tapered portion and a minimum diameter of the tapered portion, divided by a length of the tapered portion, is in a range of 0.0012/mm to 0.0031/mm;
- and
- a head portion extending from bottom of the lower portion of the body,
- wherein the exhaust valve is formed of one or more alloys.
Dependencies are inferred from the claim text.