Outboard motor and marine vessel

Patent metadata

Field	Value
Publication number	US-10286988-B2
Application number	US-201715820502-A
Country	US
Kind code	B2
Filing date	Nov 22, 2017
Priority date	Dec 28, 2016
Publication date	May 14, 2019
Grant date	May 14, 2019

Abstract

An outboard motor includes an internal combustion engine. The internal combustion engine includes a cylinder head including a fuel injector including an injection portion, and an ignition including an ignition portion that provides ignition within a combustion chamber. The ignition portion is deviated in an upward-downward direction, in which a valve actuating shaft extends, with respect to the injection portion in a central region of the combustion chamber. The ignition is mounted in the cylinder head.

First claim

What is claimed is:

1. An outboard motor comprising:
an internal combustion engine;
a cowling in which the internal combustion engine is housed; and
a propulsion unit that converts a rotational drive force of the internal combustion engine into a thrust force; wherein
the internal combustion engine includes:
a cylinder head including an intake opening through which intake air is introduced into a combustion chamber of a cylinder and an exhaust opening through which exhaust gas is discharged from the combustion chamber;
a plurality of valves that open and close the intake opening and the exhaust opening;
a pair of valve actuators each including a valve actuating shaft and that transmit a drive force to the plurality of valves;
a fuel injector mounted in the cylinder head and including an injection portion that injects fuel from a central region of the combustion chamber between the intake opening and the exhaust opening into the combustion chamber; and
an ignition mounted in the cylinder head and including an ignition portion deviated in an upward-downward direction, in which the valve actuating shaft extends, with respect to the injection portion in the central region and that provides ignition within the combustion chamber; and

at least one of the fuel injector and the ignition is inclined in the upward-downward direction which the valve actuating shaft extends.

2. The outboard motor according to claim 1 , wherein at least one of the fuel injector and the ignition is inclined with respect to a first direction, in which the cylinder of the internal combustion engine extends, along the upward-downward direction between the pair of valve actuators in the cylinder head.

3. The outboard motor according to claim 2 , wherein the ignition is inclined away from the fuel injector along the upward-downward direction between the pair of valve actuators in the cylinder head.

4. The outboard motor according to claim 1 , wherein the ignition portion is deviated in the upward-downward direction from a center of the combustion chamber in the upward-downward direction.

5. An outboard motor comprising:
an internal combustion engine;
a cowling in which the internal combustion engine is housed; and
a propulsion unit that converts a rotational drive force of the internal combustion engine into a thrust force; wherein
the internal combustion engine includes:
a cylinder head including an intake opening through which intake air is introduced into a combustion chamber of a cylinder and an exhaust opening through which exhaust gas is discharged from the combustion chamber;
a plurality of valves that open and close the intake opening and the exhaust opening;
a pair of valve actuators each including a valve actuating shaft and that transmit a drive force to the plurality of valves;
a fuel injector mounted in the cylinder head and including an injection portion that injects fuel from a central region of the combustion chamber between the intake opening and the exhaust opening into the combustion chamber; and
an ignition mounted in the cylinder head and including an ignition portion deviated in an upward-downward direction, in which the valve actuating shaft extends, with respect to the injection portion in the central region and that provides ignition within the combustion chamber;

the ignition portion is deviated in the upward-downward direction from a center of the combustion chamber in the upward-downward direction; and
the injection portion is deviated in a second direction, which is perpendicular or substantially perpendicular to the upward-downward direction, from a center of the combustion chamber in the second direction, along or near a centerline that passes through the center of the combustion chamber in the upward-downward direction and extends in the second direction.

6. The outboard motor according to claim 5 , wherein
the intake opening and the exhaust opening are respectively provided on a first side and a second side in the second direction with respect to the center of the combustion chamber in the second direction; and
the injection portion is deviated to the first side in the second direction with respect to the center of the combustion chamber in the second direction.

7. The outboard motor according to claim 1 , wherein the fuel injector extends in a first direction, in which the cylinder of the internal combustion engine extends, between the pair of valve actuators in the cylinder head.

8. An outboard motor comprising:
an internal combustion engine;
a cowling in which the internal combustion engine is housed; and
a propulsion unit that converts a rotational drive force of the internal combustion engine into a thrust force; wherein
the internal combustion engine includes:
a cylinder head including an intake opening through which intake air is introduced into a combustion chamber of a cylinder and an exhaust opening through which exhaust gas is discharged from the combustion chamber;
a plurality of valves that open and close the intake opening and the exhaust opening;
a pair of valve actuators each including a valve actuating shaft and that transmit a drive force to the plurality of valves;
a fuel injector mounted in the cylinder head and including an injection portion that injects fuel from a central region of the combustion chamber between the intake opening and the exhaust opening into the combustion chamber; and
an ignition mounted in the cylinder head and including an ignition portion deviated in an upward-downward direction, in which the valve actuating shaft extends, with respect to the injection portion in the central region and that provides ignition within the combustion chamber;

the internal combustion engine further includes a valve actuator lid that covers the pair of valve actuators; and
the fuel injector is inclined with respect to a first direction, in which the cylinder of the internal combustion engine extends, along a second direction, which is perpendicular or substantially perpendicular to the upward-downward direction, such that the fuel injector avoids the pair of valve actuators and the valve actuator lid between the pair of valve actuators in the cylinder head.

9. The outboard motor according to claim 3 , wherein the ignition includes:
a first ignition including a first ignition portion deviated to a first side in the upward-downward direction with respect to the injection portion in the central region and that provides ignition within the combustion chamber, the first ignition inclined away from the fuel injector toward the first side in the upward-downward direction between the pair of valve actuators in the cylinder head; and
a second ignition including a second ignition portion deviated to a second side in the upward-downward direction with respect to the injection portion in the central region and that provides ignition within the combustion chamber, the second ignition inclined away from the fuel injector toward the second side in the upward-downward direction between the pair of valve actuators in the cylinder head.

10. An outboard motor comprising:
an internal combustion engine;
a cowling in which the internal combustion engine is housed; and
a propulsion unit that converts a rotational drive force of the internal combustion engine into a thrust force; wherein
the internal combustion engine includes:
a cylinder head including an intake opening through which intake air is introduced into a combustion chamber of a cylinder and an exhaust opening through which exhaust gas is discharged from the combustion chamber;
a plurality of valves that open and close the intake opening and the exhaust opening;
a pair of valve actuators each including a v

Assignees

• Yamaha Motor Co Ltd

Inventors

• Suzuki Kaname

Classifications

• F02B61/045

  for marine engines · CPC title

• F01P3/16

  for cooling fuel injectors or sparking-plugs · CPC title

• F02B75/22

  with cylinders in V, fan, or star arrangement · CPC title

• B63H20/28

  Arrangements, apparatus and methods for handling cooling-water in outboard drives, e.g.} cooling-water intakes {(cooling circuits for outboard marine engines F01P3/202) · CPC title

• B63H20/24 Primary

  Arrangements, apparatus and methods for handling exhaust gas in outboard drives, e.g.} exhaust gas outlets {(in engines, e.g. outboard marine engines, F01N) · CPC title