Internal combustion engine

Patent metadata

Field	Value
Publication number	US-10378428-B2
Application number	US-201815874003-A
Country	US
Kind code	B2
Filing date	Jan 18, 2018
Priority date	Mar 16, 2017
Publication date	Aug 13, 2019
Grant date	Aug 13, 2019

Abstract

An internal combustion engine includes: a main combustion chamber; an intake port connected to the main combustion chamber at an intake opening; an exhaust port connected to the main combustion chamber at an exhaust opening; a sub-chamber provided between the intake opening and the exhaust opening, and connected to the main combustion chamber through a plurality of through-holes; a fuel injector injecting fuel into the sub-chamber; and a spark plug performing ignition in the sub-chamber. A tumble flow flows from a first side to a second side as seen from the sub-chamber. The through-holes include: a first through-hole formed in a first side part of a side wall of the sub-chamber; and a second through-hole different from the first through-hole. A diameter of the first through-hole is larger than that of the second through-hole.

First claim

What is claimed is:

1. An internal combustion engine comprising:
a main combustion chamber sandwiched between a cylinder head and a piston facing the cylinder head;
an intake port formed within the cylinder head and connected to the main combustion chamber at an intake opening;
an exhaust port formed within the cylinder head and connected to the main combustion chamber at an exhaust opening;
a sub-chamber provided on the cylinder head between the intake opening and the exhaust opening, and connected to the main combustion chamber through a plurality of through-holes;
a fuel injector injecting fuel into the sub-chamber; and
a spark plug performing ignition in the sub-chamber, wherein
a tumble flow at a position of the sub-chamber flows from a first side to a second side as seen from the sub-chamber,
the plurality of through-holes include:
a first through-hole formed in a part on the first side of a side wall of the sub-chamber; and
a second through-hole different from the first through-hole and formed in a part on the second side of the side wall of the sub-chamber,
a diameter of the first through-hole is larger than a diameter of the second through-hole, and
the fuel injector preferentially injects fuel to a direction of the second side over a direction of the first side.

2. The internal combustion engine according to claim 1 , wherein
the first through-hole and the second through-hole face each other.

3. The internal combustion engine according to claim 1 , wherein
there is no fuel injector in the intake port nor in the main combustion chamber.

4. The internal combustion engine according to claim 1 , wherein
the fuel injector injects fuel of a first injection amount into the sub-chamber in an intake stroke, and
the fuel injector injects fuel of a second injection amount less than the first injection amount into the sub-chamber after the intake stroke and before an ignition timing.

5. The internal combustion engine according to claim 1 , wherein
the plurality of through-holes further include a third through-hole, and
the third through-hole is provided such that the fuel injected from the fuel injector passes through the third through-hole to directly enter the main combustion chamber.

6. An internal combustion engine comprising:
a main combustion chamber sandwiched between a cylinder head and a piston facing the cylinder head;
an intake port formed within the cylinder head and connected to the main combustion chamber at an intake opening;
an exhaust port formed within the cylinder head and connected to the main combustion chamber at an exhaust opening;
a sub-chamber provided on the cylinder head between the intake opening and the exhaust opening, and connected to the main combustion chamber through a plurality of through-holes;
a fuel injector injecting fuel into the sub-chamber; and
a spark plug performing ignition in the sub-chamber, wherein
the plurality of through-holes include:
a first through-hole formed in a part on a side of the intake opening of a side wall of the sub-chamber; and
a second through-hole different from the first through-hole and formed in a part on a side of the exhaust opening of the side wall of the sub-chamber,
a diameter of the first through-hole is larger than a diameter of the second through-hole, and
the fuel injector preferentially injects fuel to a direction of the side of the exhaust opening over a direction of the side of the intake opening.

Assignees

• Toyota Motor Co Ltd

Inventors

• Muto Tomoyuki

Classifications

• F02B19/08 Primary

  the chamber being of air-swirl type · CPC title

• F02B19/108

  with fuel injection at least into pre-combustion chamber, i.e. injector mounted directly in the pre-combustion chamber · CPC title

• F02B15/00

  Engines characterised by the method of introducing liquid fuel into cylinders and not otherwise provided for · CPC title

• F02B19/00 Primary

  Engines characterised by precombustion chambers · CPC title

• F02B19/12

  with positive ignition (engines with non-timed positive ignition, and with incandescent chambers F02B9/08) · CPC title