4-cycle engine for motorcycle
AssigneeSuzuki Motor Corporation
InventorsKoji Yoshida, Kazutatsu Suzuki, Yoshikazu Matsui
Life of this patent
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Abstract
A 4-cycle engine for a motorcycle has a secondary-air supplier for supplying secondary air to exhaust ducts. The engine includes a recess, which is depressed toward the engine, on a cylinder-head cover for holding a control valve of the secondary-air supplier. The recess and the control valve are positioned between two innermost cylinders of the array of the cylinders. Check valves, which are connected to downstream regions of the control valve, are each disposed between two outermost cylinders of the array of the cylinders.
Claims10
A 4-cycle engine for a motorcycle, the engine comprising:
- at least four cylinders arranged in a line, the at least four cylinders comprising two innermost cylinders and two outermost cylinders;
- a cylinder-head cover;
- a secondary-air supplier comprising:
- a control valve disposed between the two innermost cylinders;
- check valve cells disposed between the two outermost and innermost cylinders respectively;
- and
- downstream tubes for connecting a downstream region of the control valve with the check valve, the downstream tubes extending in opposite directions from the control valve and disposed near the cylinder-head cover parallel to the line of the cylinders;
- and
- at least one exhaust port,
- wherein the secondary-air supplier supplies secondary air to the exhaust port.
A 4-cycle engine for a motorcycle, the engine comprising:
- four cylinders arranged in a line, the four cylinders comprising two innermost cylinders and two outermost cylinders;
- a cylinder-head cover;
- a secondary-air supplier comprising:
- a control valve disposed between the two innermost cylinders;
- check-valve cells disposed between the innermost cylinder and the outermost cylinder respectively, the check-valve cells each having two check valves, and
- downstream tubes for connecting a downstream region of the control valve with the check valve cells, the downstream tube disposed near the cylinder-head cover parallel to the line of the cylinders;
- and
- exhaust ports, wherein the secondary-air supplier supplies secondary air to the exhaust ports.
A 4-cycle engine for a motorcycle, the engine comprising:
- four cylinders arranged in a line, the four cylinders comprising two innermost cylinders and two outermost cylinders;
- a cylinder-head cover;
- exhaust ports;
- and
- a secondary-air supplier supplying secondary air to the exhaust ports and comprising:
- a control valve disposed between the two innermost cylinders;
- check-valve cells disposed between the innermost cylinder and the outermost cylinder respectively, each of the check valve cells having two secondary air ducts extending therefrom and providing secondary air to one of the exhaust ports, and
- downstream tubes for connecting a downstream region of the control valve with the check valve cells, the downstream tube disposed near the cylinder-head cover parallel to the line of the cylinders.
Dependencies are inferred from the claim text.