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US 2013/0276728 A1Published application
Valve system
AssigneeGM Global Technology Operations LLC
InventorsJames B. Lewis, Hong Wai Nguyen
Life of this patent
Estimating the term…
Abstract
A valve for an engine cylinder includes a head. The valve is selectively moveable between a closed position in which the head blocks a port and an open position in which the head unblocks the port. A lower stem is formed as one-piece with the head, and a thermal cavity formed within the lower stem. The thermal cavity is at least partially filled with a heat transfer medium. An upper stem is attached to the lower stem opposite the head. A thermal barrier is located adjacent a junction of the lower stem and the upper stem.
Claims16
A valve for an engine cylinder, comprising:
- a head, wherein the valve is selectively moveable between a closed position in which the head blocks a port and an open position in which the head unblocks the port;
- a lower stem formed as one-piece with the head;
- a thermal cavity formed within the lower stem, wherein the thermal cavity is at least partially filled with a heat transfer medium;
- an upper stem attached to the lower stem opposite the head;
- and
- a thermal barrier adjacent a junction of the lower stem and the upper stem.
3 more elements
A valve system, comprising:
- a valve, including:
- a head;
- a lower stem formed as one-piece with the head;
- a thermal cavity formed within the lower stem, wherein the thermal cavity is at least partially filled with a heat transfer medium;
- an upper stem attached to the lower stem opposite the head;
- and
- a thermal barrier adjacent to a junction of the lower stem and the upper stem;
- a valve guide surrounding a portion of at least one of the lower stem and the upper stem;
- and
- an actuator configured to selectively move the valve between a closed position in which the head blocks a port and an open position in which the head unblocks the port.
7 more elements
Dependencies are inferred from the claim text.