Piston

Patent metadata

Field	Value
Publication number	US-10072561-B2
Application number	US-201615218134-A
Country	US
Kind code	B2
Filing date	Jul 25, 2016
Priority date	Jul 25, 2016
Publication date	Sep 11, 2018
Grant date	Sep 11, 2018

Abstract

A piston for an engine is provided. The piston includes a body having a crown disposed about a central axis. The crown includes an inner circumference and an outer circumference. The piston includes a central chamber transversely disposed within the body and recessed with respect to the crown. The piston includes a central mound disposed within the central chamber about the central axis. The piston also includes a bowl extending from the central mound towards the crown. The piston further includes a passageway provided on the inner circumference of the crown. The passageway includes a slot defined by a first surface inclined at a first angle with respect to the central axis. The slot is adapted to allow flow of a fuel from the central chamber towards the outer circumference of the crown.

First claim

What is claimed is:

1. A piston for an engine, the piston comprising:
a body having a crown disposed about a central axis, the crown having an inner circumference and an outer circumference;
a central chamber transversely disposed within the body and recessed with respect to the crown;
a central mound disposed within the central chamber about the central axis;
a bowl extending from the central mound towards the crown; and
a passageway provided on the inner circumference of the crown, the passageway including a slot defined by a first surface inclined at a first angle between 30° and 60° with respect to the central axis, wherein the slot is adapted to allow flow of a fuel from the central chamber towards the outer circumference of the crown.

2. The piston of claim 1 further including a plurality of the slots provided in a spaced apart arrangement from each other along the inner circumference of the crown.

3. The piston of claim 1 , wherein the passageway further includes a second surface and a third surface such that the slot defined by the first surface, the second surface, and the third surface has a triangular configuration.

4. The piston of claim 1 , wherein the central mound has a conical shape such that the central mound defines a second angle corresponding to a spray angle of a fuel injector.

5. The piston of claim 4 , wherein the second angle is between 120° and 160°.

6. The piston of claim 1 further including a re-entrant portion provided along the inner circumference of the crown, wherein the re-entrant portion defines a third angle with respect to the central axis.

7. The piston of claim 6 , wherein the third angle is between 10° and 30°.

8. The piston of claim 1 , wherein the central mound further includes a bore provided thereon, the bore adapted to engage with an assembly tool.

9. An engine comprising:
a cylinder head;
an engine block;
a cylinder provided within the engine block, the cylinder defining an inner surface;
a fuel injector provided within the cylinder, the fuel injector adapted to inject a fuel at a spray angle within the cylinder; and
a piston provided within the cylinder, the piston comprising:
a body having a crown disposed about a central axis, the crown having an inner circumference and an outer circumference;
a central chamber transversely disposed within the body and recessed with respect to the crown;
a central mound disposed within the central chamber about the central axis;
a bowl extending from the central mound towards the crown; and
a passageway provided on the inner circumference of the crown, the passageway including a slot defined by a first surface inclined at a first angle between 30° and 60° with respect to the central axis, wherein the slot is adapted to allow flow of a fuel from the central chamber towards the inner surface of the cylinder.

10. The engine of claim 9 , wherein the passageway further includes a second surface and a third surface such that the slot defined by the first surface, the second surface, and the third surface has a triangular configuration.

11. The engine of claim 9 further includes a liner provided between the outer circumference of the piston and the inner surface of the cylinder.

12. The engine of claim 9 , wherein the central mound has a conical shape such that the central mound defines a second angle corresponding to the spray angle of the fuel injector.

13. The engine of claim 12 , wherein the second angle is between 120° and 160°.

14. The engine of claim 9 further including a re-entrant portion provided along the inner circumference of the crown, wherein the re-entrant portion defines a third angle with respect to the central axis.

15. The engine of claim 14 , wherein the third angle is between 10° and 30°.

16. The engine of claim 9 , wherein the central mound further includes a bore provided thereon, the bore adapted to engage with an assembly tool.

17. The engine of claim 9 , wherein the fuel is at least one of natural gas and diesel.

Assignees

• Caterpillar Inc

Inventors

• Gong Weidong
• Chang David Yu-Zhang

Classifications

• F02B23/0651 Primary

  the fuel spray impinging on reflecting surfaces or being specially guided throughout the combustion space · CPC title

• F02F1/00

  Cylinders; Cylinder heads · CPC title

• F02F3/24

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

• F02B23/0627

  having additional bores or grooves machined into the piston for guiding air or charge flow to the piston bowl · CPC title

• F02F1/24

  Cylinder heads · CPC title