Engine structure

Patent metadata

Field	Value
Publication number	US-2024301838-A1
Application number	US-202418593531-A
Country	US
Kind code	A1
Filing date	Mar 1, 2024
Priority date	Mar 9, 2023
Publication date	Sep 12, 2024
Grant date	—

Abstract

This engine structure includes: a cylinder block in which a cylinder bore is formed; a piston provided in the cylinder bore; a cylinder head provided to an upper portion of the cylinder block in a manner to seal the cylinder bore; and a ring that is inserted in the upper end portion of the cylinder bore and has an inner diameter that is smaller than the diameter of the cylinder. A first abradable layer that is worn down by contact with an outer peripheral surface of the piston is formed on an inner peripheral surface of the ring.

First claim

What is claimed is:

1 . An engine structure comprising:
a cylinder block in which a cylinder bore is formed; a piston provided in the cylinder bore; a cylinder head provided to an upper portion of the cylinder block in a manner to seal the cylinder bore; and a ring that is inserted in an upper end portion of the cylinder bore and has an inner diameter that is smaller than a diameter of the cylinder bore, wherein a first abradable layer that is worn down by contact with an outer peripheral surface of the piston is formed on an inner peripheral surface of the ring.

2 . The engine structure according to claim 1 , wherein
a second abradable layer is formed on a region immediately below the ring within an inner peripheral surface of the cylinder bore.

3 . The engine structure according to claim 2 , wherein
the region immediately below includes a region from a lower end of the ring to a lower end of a ring-shaped member provided on the outer peripheral surface of the piston in a state of being positioned at a top dead center.

4 . The engine structure according to claim 1 , wherein
a third abradable layer is formed on at least a part of a circular region of the cylinder head that covers the cylinder bore.

5 . The engine structure according to claim 3 , wherein
the circular region is provided with: a fuel injection member for injecting fuel, and a plurality of valves, wherein the third abradable layer is formed on a ring-shaped region that is outward from the fuel injection member and the plurality of valves.

6 . The engine structure according to claim 1 , wherein
hardness of the first abradable layer is lower than hardness of the piston.

7 . An engine structure comprising:
a cylinder block in which a cylinder bore is formed; a piston provided in the cylinder bore; and a cylinder head provided to an upper portion of the cylinder block in a manner to seal the cylinder bore, wherein a portion of the cylinder bore on an upper end side has a smaller diameter than a portion of the cylinder bore on a lower end side, and the cylinder bore has an abradable layer having hardness that is lower than hardness of the piston, on an inner peripheral surface of the portion of the cylinder bore on the upper end side.

Assignees

• Isuzu Motors Ltd

Inventors

• Goto Misao
• Yamamoto Kazunari
• Komiyama Takumi

Classifications

• F02F3/26

  having combustion chamber in piston head (the surface thereof being covered F02F3/14) · CPC title

• F02F1/242

  Arrangement of spark plugs or injectors · CPC title

• F02F1/24

  Cylinder heads · CPC title

• F02F1/18 Primary

  Other cylinders · CPC title

• F02F2001/006

  having a ring at the inside of a liner or cylinder for preventing the deposit of carbon oil particles, e.g. oil scrapers · CPC title