Piston and engine provided with the same

Patent metadata

Field	Value
Publication number	US-10233864-B2
Application number	US-201715829122-A
Country	US
Kind code	B2
Filing date	Dec 1, 2017
Priority date	Jul 28, 2017
Publication date	Mar 19, 2019
Grant date	Mar 19, 2019

Abstract

A piston and an engine including the same are provided. The piston includes an upper surface that is formed at an upper portion; a bowl that is concavely formed at the upper surface; a plurality of protruding portions that are separated by a predetermined distance along an edge of the bowl; and a central portion that is protruded upward at the center of the bowl.

First claim

What is claimed is:

1. A piston, comprising:
an upper surface that is formed at an upper portion;
a bowl that is recessed from the upper surface;
a central portion that is protruded upward at the center of the bowl;
a plurality of protruding portions that are separated by a predetermined distance along an edge of the bowl, wherein each of the protruding portions comprises a first guide surface that is inclined to flow fuel in a first direction, and a second guide surface that is inclined in a second direction opposite to the first direction, wherein a cross-sectional slope of the first guide surface in a cross-section taken in a vertical direction of the piston is more gentle than that of a second guide surface in the cross-section taken in the vertical direction of the piston; and
a recess portion formed between two of the plurality of protruding portions, the recess portion being configured to guide fuel upwardly,
wherein the bowl comprises a plurality of protruding portion lips and a recess portion lip at a boundary of the bowl, each protruding portion lip being formed between one of the plurality of protruding portions and the upper surface, the recess portion lip being formed between the recess portion and the upper surface,
wherein a distance between the center of the bowl and the protruding portion lip is longer than that between the center of the bowl and the recess portion lip,
wherein a height of the recess portion lip is 1.5 times or less larger than that of the protruding portion lip.

2. The piston of claim 1 , wherein a length from the center of the bowl to the protruding portion lip is 0.95 times to 1.0 times larger than that from the center of the bowl to an uppermost portion of the protruding portion.

3. The piston of claim 1 , wherein a length from the center of the bowl to the recess portion lip is 0.8 times to 0.9 times larger than that from the center of the bowl to an endmost portion of the recess portion.

4. An engine, comprising:
an injector in which a plurality of injector holes are radially and downwardly formed; and
a piston comprising:
an upper surface that is formed at an upper portion;
a bowl that is recessed from the upper surface;
a central portion that is protruded upward at the center of the bowl;
a plurality of protruding portions that are separated by a predetermined distance along an edge of the bowl, wherein each of the protruding portions comprises a first guide surface that is inclined to flow fuel in a first direction, and a second guide surface that is inclined in a second direction opposite to the first direction, wherein a cross-sectional slope of the first guide surface in a cross-section taken in a vertical direction of the piston is more gentle than that of a second guide surface in the cross-section taken in the vertical direction of the piston; and
a recess portion formed between two of the plurality of protruding portions, the recess portion being configured to guide fuel upwardly,
wherein the bowl comprises a plurality of protruding portion lips and a recess portion lip at a boundary of the bowl, each protruding portion lip being formed between one of the plurality of protruding portions and the upper surface, the recess portion lip being formed between the recess portion and the upper surface,
wherein a distance between the center of the bowl and the protruding portion lip is longer than that between the center of the bowl and the recess portion lip,
wherein a height of the recess portion lip is 1.5 times or less larger than that of the protruding portion lip.

5. The engine of claim 4 , wherein a length from the center of the bowl to the protruding portion lip is 0.95 times to 1.0 times larger than that from the center of the bowl to an uppermost portion of the protruding portion.

6. The engine of claim 4 , wherein a length from the center of the bowl to the recess portion lip is 0.8 times to 0.9 times larger than that from the center of the bowl to an endmost portion of the recess portion.

Assignees

• Hyundai Motor Co Ltd
• Kia Motors Corp

Inventors

• Yu Seungeun

Classifications

• Y02T10/12

  Improving ICE efficiencies · CPC title

• F02F3/24 Primary

  having means for guiding gases in cylinders, e.g. for guiding scavenging charge in two-stroke engines · CPC title

• F02B23/0672 Primary

  Omega-piston bowl, i.e. the combustion space having a central projection pointing towards the cylinder head and the surrounding wall being inclined towards the cylinder center axis (the surrounding wall being exactly vertical F02B23/0696) · CPC title

• F02B23/0696

  W-piston bowl, i.e. the combustion space having a central projection pointing towards the cylinder head and the surrounding wall being inclined towards the cylinder wall · CPC title

• F02F3/26 Primary

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