Methods for reducing oil sticking on surfaces of internal combustion engines

Patent metadata

Field	Value
Publication number	US-10947925-B2
Application number	US-201916446137-A
Country	US
Kind code	B2
Filing date	Jun 19, 2019
Priority date	Jun 19, 2019
Publication date	Mar 16, 2021
Grant date	Mar 16, 2021

Abstract

Components for reducing oil sticking on surfaces of an internal combustion engine are disclosed. The engine may include an engine block with a piston cylinder, a piston moveable in reciprocal motion within the piston cylinder, and a cylinder head mounted on the engine block. The engine block, the cylinder head, and the piston may define a combustion chamber. The engine may include an intake conduit mounted to the cylinder head, an intake valve port defined by the cylinder head, and an intake valve mounted in reciprocally movable fashion to the cylinder head for placing the intake valve port in fluid communication with the combustion chamber. The engine may include a first oleophobic coating provided on portions of the intake valve, and a valve seat insert secured to the cylinder head. The valve seat insert may define an oil passage in fluid communication with the intake valve port.

First claim

What is claimed is:

1. An internal combustion engine assembly comprising:
an engine block comprising a piston cylinder;
a piston moveable in reciprocal motion within the piston cylinder;
a cylinder head mounted on the engine block,
wherein the engine block, the cylinder head, and the piston define a combustion chamber;

an intake conduit mounted to the cylinder head;
an intake valve port defined by the cylinder head,
wherein the intake valve port is in fluid communication with the intake conduit and with the combustion chamber;

an intake valve mounted in reciprocally movable fashion to the cylinder head for selectively placing the intake valve port in fluid communication with the combustion chamber;
a first oleophobic coating provided on one or more portions of the intake valve,
wherein the one or more portions of the intake valve include one or more surfaces that provide, with the first oleophobic coating, a maximum static contact angle that is greater than one-hundred degrees for oil and a minimum sliding angle that is less than ten degrees for the oil, and
wherein the first oleophobic coating provided on the one or more portions of the intake valve causes the oil on the one or more portions of the intake valve to atomize into smaller droplets or beads upon contact with the one or more portions of the intake valve; and

a valve seat insert secured to the cylinder head near an outlet end of the intake valve port,
wherein the valve seat insert includes a valve seat surface for contacting the intake valve when the intake valve is in a closed position,
wherein the valve seat insert defines an oil passage in fluid communication with an oil supply conduit and the intake valve port, and
wherein the oil is to be introduced into the combustion chamber by pumping the oil through the oil passage.

2. The internal combustion engine assembly of claim 1 , further comprising:
a second oleophobic coating provided on one or more portions of the valve seat insert adjacent to the oil passage.

3. The internal combustion engine assembly of claim 1 , further comprising:
a second oleophobic coating provided on one or more portions of the intake conduit; and
a third oleophobic coating provided on one or more portions of the intake valve port.

4. The internal combustion engine assembly of claim 1 , wherein the first oleophobic coating comprises one or more of:
a material that fails to attract oil and oil-based materials, or
a material that includes non-polar atoms.

5. The internal combustion engine assembly of claim 1 , wherein the first oleophobic coating comprises one or more of:
polytetrafluoroethylene,
tetrafluoroethylene,
perfluormethyl vinyl ether,
fluorinated ethylene-propylene,
cellulose acetate,
polymethyl methacrylate,
polypropylene,
polyisobutylene,
polyethylene,
crown glass,
polyvinyl acetate,
polyamide;
polyvinylchloride,
polycarbonate,
polystyrene,
polyacrylate, or
polyethylene terephthalate.

6. The internal combustion engine assembly of claim 1 , wherein the first oleophobic coating comprises a material capable of withstanding temperatures experienced in the combustion chamber.

7. The internal combustion engine assembly of claim 1 , wherein the first oleophobic coating prevents the oil from sticking.

8. An intake valve assembly provided in an internal combustion engine that includes an engine block with a piston cylinder, a piston moveable in reciprocal motion within the piston cylinder, a cylinder head mounted on the engine block, and an intake conduit mounted to the cylinder head, wherein the engine block, the cylinder head, and the piston define a combustion chamber, the intake valve assembly comprising:
an intake valve port defined by the cylinder head,
wherein the intake valve port is in fluid communication with the intake conduit and with the combustion chamber;

an intake valve mounted in reciprocally movable fashion to the cylinder head for selectively placing the intake valve port in fluid communication with the combustion chamber;
a first oleophobic coating provided on one or more portions of the intake valve port,
wherein the one or more portions of the intake valve port include one or more surfaces that provide, with the first oleophobic coating, a maximum static contact angle that is greater than one-hundred degrees for oil and a minimum sliding angle that is less than ten degrees for the oil, and
wherein the first oleophobic coating provided on the one or more portions of the intake valve port causes the oil on the one or more portions of the intake valve port to atomize into smaller droplets or beads upon contact with the one or more portions of the intake valve port; and

a valve seat insert secured to the cylinder head near an outlet end of the intake valve port,
wherein the valve seat insert includes a valve seat surface for contacting the intake valve when the intake valve is in a closed position,
wherein the valve seat insert defines an oil passage in fluid communication with an oil supply conduit and the intake valve port, and
wherein the oil is to be introduced into the combustion chamber by pumping the oil through the oil passage.

9. The intake valve assembly of claim 8 , further comprising:
a second oleophobic coating provided on one or more portions of the valve seat insert adjacent to the oil passage.

10. The intake valve assembly of claim 8 , further comprising:
a second oleophobic coating provided on one or more portions of the intake conduit; and
a third oleophobic coating provided on one or more portions of the intake valve.

11. The intake valve assembly of claim 8 , wherein the first oleophobic coating comprises one or more of:
a material that fails to attract oil and oil-based materials, or
a material that includes non-polar atoms.

12. The intake valve assembly of claim 8 , wherein the first oleophobic coating comprises a material capable of withstanding temperatures experienced in the combustion chamber.

13. The intake valve assembly of claim 8 , wherein the first oleophobic coating prevents the oil from sticking and causes the oil to atomize into smaller droplets upon contact.

14. A machine, comprising:
an engine block for an internal combustion engine,
wherein the engine block includes a piston cylinder;

a piston moveable in reciprocal motion within the piston cylinder;
a cylinder head mounted on the engine block,
wherein the engine block, the cylinder head, and the piston define a combustion chamber;

an intake conduit mounted to the cylinder head;
an intake valve port defined by the cylinder head,
wherein the intake valve port is in fluid communication with the intake conduit and with the combustion chamber;

a first oleophobic coating provided on one or more portions of the intake valve port;
an intake valve mounted in reciprocally movable fashion to the cylinder head for selectively placing the intake valve port in fluid communication with the combustion chamber;
a second oleophobic coating provided on one or more portions of the intake valve,
wherein the one or more portions of the intake valve include one or more surfaces that provide, with the second oleophobic coating, a maximum static contact angle that is greater than one-hundred degrees for oil and a minimum sliding angle that is less than ten degrees for the oil, and
wherein the second oleophobic coating provided on the one or more portions of the intake valve causes the oil on the one or more portions of the intake valve to atomize into smaller droplets or beads upon contact with the one or more portions of the intake valve; and

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Assignees

• Caterpillar Inc

Inventors

• Singh Jaswinder
• Bardell Michael
• Seiler Patrick J
• Wang Paul S
• Ginter David

Classifications

• F02F1/40 Primary

  cylinder heads with means for directing, guiding, or distributing liquid stream · CPC title

• F02F1/20

  characterised by constructional features providing for lubrication · CPC title

• F01L3/04

  Coated valve members or valve-seats · CPC title

• F01L2301/00

  Using particular materials · CPC title

• F01L2820/01

  Absolute values · CPC title