US 6,581,563 B2Granted

Method for lubricating two-cycle internal combustion engine

AssigneeHonda Giken Kogyo Kabushiki Kaisha

InventorHisashi Uneta

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Abstract

An internal combustion engine includes a combustion chamber, a chamber portion, and a communication passage for communicating the combustion chamber to the chamber portion. A valve for opening/closing the passage allows a high compression gas to be charged into the chamber portion and an air-fuel mixture to be injected from the chamber portion into the combustion chamber. A lubricating system keeps the opening of the passage to the combustion chamber and a surface of a piston facing to the opening well lubricated. The lubricating system includes an oil supply hole opening in a same direction as the opening of the passage to the combustion chamber. The oil supply hole may be positioned under the opening of the passage, or may be provided between a lower edge of the opening of the passage and a piston ring of the piston, when the piston is located at a bottom dead center.

Claims21

Dependent claims

An internal combustion engine comprising:

a cylinder block having a cylinder formed therein;
a piston reciprocally moveable within said cylinder;
a combustion chamber formed at one end of said cylinder;
a chamber portion;
a communication passage having a first end opening to said cylinder and a second end opening to said chamber portion, said first end opening to said cylinder along a width;
a control valve provided in said communication passage for controlling an opening and closing of said communication passage;
a scavenging passage opening to said cylinder at a position below said first end of said communication passage;
and
a lubricating oil supply for providing oil to said cylinder, said lubricating oil supply feeding oil to a first hole provided in a wall of said cylinder, wherein said first hole is one hole positioned below said first end of said communication passage and below said opening of said scavenging passage into said cylinder, when taken in a reciprocal travel direction of said piston, and wherein said first hole is located below and within said width of said first end of communication passage.

6 more elements

An internal combustion engine comprising:

a cylinder block having a cylinder formed therein;
a piston reciprocally moveable within said cylinder;
a combustion chamber formed at one end of said cylinder;
a chamber portion;
a communication passage having a first end opening to said cylinder and a second end opening to said chamber portion, said first end opening to said cylinder along a width, wherein said chamber portion receives a high compression gas and discharges an air-fuel mixture into said cylinder for combustion in said combustion chamber;
a scavenging passage opening to said cylinder at a position below said first end of said communication passage;
and
a lubricating oil supply for providing oil to said cylinder, said lubricating oil supply feeding oil to a first hole provided in a wall of said cylinder, wherein said first hole is one hole positioned below said first end of said communication passage and below said opening of said scavenging passage into said cylinder, when taken in a reciprocal travel direction of said piston, and wherein said first hole is located below and within said width of said first end of communication passage.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 09/897,061Filed 3 Jul 2001
Priority: JP 2000-2024804 Jul 2000
Published: US 2002/0011231 A131 Jan 2002
Granted: 24 Jun 2003
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

F01M 1/02
Pressure lubrication: using lubricating pumps
F02B 61/02
Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing: for driving cycles
F02F 1/22
Other cylinders: characterised by having ports in cylinder wall for scavenging or charging
F01M 2001/083
Lubricating systems characterised by the provision therein of lubricant jetting means: for lubricating cylinders