Internal combustion engine

Patent metadata

Field	Value
Publication number	US-10808602-B2
Application number	US-201916260297-A
Country	US
Kind code	B2
Filing date	Jan 29, 2019
Priority date	Feb 7, 2018
Publication date	Oct 20, 2020
Grant date	Oct 20, 2020

Abstract

An internal combustion engine includes a fuel injection nozzle that is arranged at the center of an upper surface of a combustion chamber with an injection port thereof exposed in the combustion chamber, and a piston arranged in a cylinder. On a top surface of the piston, a flow guide passage is provided which extends from an inlet exposed on the side of a wall of a bore of the cylinder to an outlet exposed on the side of a center of the bore. The flow guide passage preferably includes a flow guide plate having a ring shape, and a strut that fixes the flow guide plate to the top surface of the piston in such a manner that a clearance extending from an outer edge to an inner edge of the flow guide plate is formed between the flow guide plate and the top surface of the piston.

First claim

What is claimed is:

1. An internal combustion engine of a compression ignition type in which combustion of a fuel is achieved by injecting the fuel into a combustion chamber in which air is compressed, the internal combustion engine comprising:
a fuel injection nozzle that has an injection port through which the fuel is injected, and is arranged at a center of an upper surface of the combustion chamber with the injection port thereof exposed in the combustion chamber;
a piston arranged in a cylinder; and
a flow guide passage that is arranged on a top surface of the piston and extends from an inlet exposed on the side of a wall of a bore of the cylinder to an outlet exposed on the side of a center of the bore.

2. The internal combustion engine according to claim 1 ,
wherein the flow guide passage comprises:
a flow guide plate having a ring shape; and
a strut that fixes the flow guide plate to the top surface of the piston in such a manner that a clearance extending from an outer edge to an inner edge of the flow guide plate is formed between the flow guide plate and the top surface of the piston.

3. The internal combustion engine according to claim 2 ,
wherein the flow guide plate is configured so that the clearance between the flow guide plate and the top surface of the piston becomes wider as it goes from the outer edge to the inner edge.

4. The internal combustion engine according to claim 2 ,
wherein the fuel injection nozzle is configured so that a fuel spray injected from the injection port flows along an upper surface of the flow guide plate, and
the flow guide plate has a recessed part that is recessed to the side of the piston and extends along an injection port axis of the fuel spray injected from the injection port.

5. The internal combustion engine according to claim 1 ,
wherein the flow guide passage has a through-hole that extends through the piston from the inlet exposed on the side of the wall of the bore of the cylinder to the outlet exposed on the side of the center of the bore.

6. The internal combustion engine according to claim 1 ,
wherein the fuel injection nozzle has a plurality of injection ports having different injection directions, and
a plurality of flow guide passages is provided for the plurality of injection ports.

Assignees

• Toyota Motor Co Ltd

Inventors

• Tanno Shiro

Classifications

• Y02T10/12

  Improving ICE efficiencies · CPC title

• F02B23/0624 Primary

  Swirl flow · CPC title

• F02M61/14

  Arrangements of injectors with respect to engines; Mounting of injectors · CPC title

• F02F3/28

  Other pistons with specially-shaped head · CPC title

• F02M61/1813

  Discharge orifices having different orientations with respect to valve member direction of movement, e.g. orientations being such that fuel jets emerging from discharge orifices collide with each other · CPC title