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US 2023/0359403 A1Published application
Multi-port exhaust valve
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.
Claims16
An engine component comprising:
- a cylinder wall defining:
- a cylinder;
- a central exhaust port;
- a first lateral exhaust port;
- and
- one or more intake ports;
- and
- a cavity outside of the cylinder in fluid communication with the central exhaust port and the first lateral exhaust port, the cavity defining a curved surface extending outwardly from the central exhaust port.
5 more elements
An engine comprising:
- a valve body defining an axis of rotation and a central valve surface, the central valve surface conforming to a first shape that is symmetric about the axis of rotation;
- a cylinder wall defining:
- a cylinder;
- a central exhaust port;
- and
- one or more intake ports;
- a cavity outside of the cylinder in fluid communication with the central exhaust port and sized to receive the valve body such that the central valve surface is rotatable relative to the central exhaust port between a low position and a high position, the central valve surface covering a greater amount of the central exhaust port in the low position;
- a piston positioned within the cylinder;
- a crankshaft coupled to the piston;
- a speed sensor configured to sense an angular speed of the crankshaft;
- an actuator coupled to the valve body;
- and
- an electronic control unit coupled to the speed sensor and the actuator, the electronic control unit programmed to cause the actuator to adjust a position of the valve body based on outputs of the speed sensor at an angular speed of rotation that is less than the angular speed of the crankshaft.
10 more elements
An exhaust valve comprising:
- a valve body defining an axis of rotation;
- a first valve positioned on the valve body this is positionable along an exhaust port of a cylinder;
- and
- a second lateral valve positioned on the valve body that is positionable along an auxiliary exhaust port of the cylinder, wherein the position of the second lateral valve on the body is fixed with respect to the position of the first valve on the body.
1 more element
Dependencies are inferred from the claim text.