Engine piston with insulated combustion chamber

• US 4,018,194 A
• Filed: 01/06/1975
• Issued: 04/19/1977
• Est. Priority Date: 01/06/1975
• Status: Expired due to Term

• Current Assignee: Texaco Incorporated (Chevron Corp.)
• Original Assignee: Texaco Incorporated (Chevron Corp.)
• Inventors: Cobb, John M., Mitchell, Edward
• Primary Examiner(s): Burns, Wendell E.
• Assistant Examiner(s): Feinberg, Craig R.
• Application Number:
  US05/538,669
• Time in Patent Office: 834 Days
• Field of Search: 123/75 B, 123/32 B, 123/193 P, 123/30 A, 123/32 J, 123/122 R, 123/32 AA, 123/191 R, 123/191 A, 123/41.35, 92/176
• US Class Current: 123/276
• CPC Class Codes: F02B 2023/0612 the material having a high temperature and pressure resistance, e.g. ceramic
• CPC Class Codes: F02B 23/0603 at least part of the interior volume or the wall of the combustion space being made of material different from the surrounding piston part, e.g. combustion space formed within a ceramic part fixed to a metal piston head
• CPC Class Codes: F02B 23/0624 Swirl flow
• CPC Class Codes: F02B 23/0639 the combustion space having substantially the shape of a cylinder
• CPC Class Codes: F02B 23/0696 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 Class Codes: F02F 3/14 within combustion chambers
• CPC Class Codes: Y02T 10/12 Improving ICE efficiencies

Abstract

Piston for an internal combustion engine having an upper face which forms a part of an expandable combustion chamber. The piston is provided with a cavity or deep depression formed in the upper face to promote fuel-air mixing as well as to improve the combustion process within said combustion chamber. The cavity is formed within a cup-like insert member, so positioned within the piston body that the cup-like insert is substantially spaced or insulated from the piston body, thereby avoiding or minimizing heat loss to the piston walls.

Claims

1. In a piston for an internal combustion engine which utilizes fuel injection to establish a combustible fuel-air mixture within the engine combustion chamber said piston including;

a body with a head having a face which opens into a combustion chamber into which fuel is introduced to establish the combustible mixture,

an insert member fixedly positioned within said piston body and being supportably spaced from the latter to define a thermal barrier whereby to substantially insulate said combustion chamber from the piston thereby to minimize heat flow therebetween,

said insert member having means forming a recessed cavity therein which is communicated with said combustion chamber, said insert member further including an outer wall having a plurality of discretely spaced conical segments depending outwardly from said insert member wall and having the conical points of said segments at least partially embedded into the wall of said piston whereby said thermal barrier comprises an air gap.