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US 11,761,358 B2Granted
Multi-port exhaust valve for two-stroke engines
AssigneeArctic Cat Inc.
InventorsCarson Price, Jeremy Mammen
Life of this patent
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Abstract
An exhaust valve includes a toroidal surface about an axis of rotation of the valve. The toroidal surface is positionable over a central exhaust port of an engine when lowered. The valve is raised by an actuator in response to increasing rotational speed of the crankshaft of the engine, thereby enlarging and raising the effective opening of the exhaust port. Lateral valve surfaces on either side of the toroidal surface close lateral exhaust ports when the valve is lowered. The lateral valve surfaces may be cylindrical and formed on fins.
Claims25
An exhaust valve comprising:
- a valve body defining an axis of rotation;
- a central valve surface positioned on the valve body and conforming to a first curved shape;
- and
- a first lateral valve surface positioned on the valve body, the first lateral valve surface conforming to a second curved shape that is different from the first shape.
1 more element
Dependencies are inferred from the claim text.