Two-piece piston assembly
AssigneeMack Trucks, Inc.
InventorWinton J. Pelizzoni
Life of this patent
Estimating the term…
Abstract
A two-piece piston assembly comprises an upper portion or a ring carrier part that may be made of malleable iron, cast iron, or a similar iron, and a lower portion or cross-head part, referred to as a skirt, that may be made of aluminum or an alloy thereof. The assembly is configured to increase the contact of cooling liquid with the underside of the crown and eliminate problems accompanying undue heating in this area of the piston. The cocktail-shaker action of the two-piece piston assembly is employed to enhance the cooling effect. A separate cup-like device is secured around the outside of the lower end of the crown member of the piston and is thus positioned between the upper and lower portions of the piston to retain the oil and effectively deliver it to the underside of the crown.
Claims13
A two-piece piston for reciprocal movement within a cylinder of an internal combustion engine comprising:
- (a) an upper section having depending boss means and an open, underside portion therewithin;
- (b) a skirt section below said upper section;
- (c) means engaging said boss means and said skirt section for holding said upper section and said skirt section in assembled relationship with said upper section and said skirt section being spaced from each other at their peripheries;
- (d) a separate, fluid coolant-retaining means disposed in the space between said upper section and said skirt section, said retaining means having a bottom portion defining a passage therethrough for said depending boss means, said passage in said bottom portion being surrounded by walls extending upwardly from said bottom portion, said walls cooperating with said bottom portion to define an open top to retain coolant therein and to allow the coolant to be splashed upwardly to the underside of said upper section during operation of said piston in an internal combustion engine;
- (e) said upper section on the external periphery thereof having holding means for securing said retaining means;
- and
- (f) said retaining means being secured to said holding means.
A two-piece piston for reciprocal movement within a cylinder of an internal combustion engine comprising:
- (a) an upper section having depending boss means, said boss means having a bore for receiving a pin, said upper section having an open underside portion therewithin, and said upper section being made of iron;
- (b) a separate coolant-retaining means depending from and within said upper section substantially throughout the cross-section of said upper section, said retaining means having a bottom portion defining passages therethrough for said depending boss means, said passages in said bottom portion being surrounded by walls extending upwardly from said bottom portion, peripheral side walls extending upwardly from said bottom portion and spaced from said walls surrounding said passages, said retaining means having a coolant passage for fluid coolant directed under pressure from beneath said upper section toward said underside portion, said walls cooperating with said bottom portion to define an open top to retain coolant therein and to allow coolant to be splashed upwardly to the underside of the upper section during operation of said piston in an internal combustion engine;
- (c) said upper section having an annular member extending outwardly from a lower portion of said upper section and around the circumference of said upper section;
- (d) a skirt section assembled to said upper section, the skirt section having bores corresponding to and coaxial with bores in said upper section for receiving said pin to hold said upper and skirt sections in assembled relationship, said upper section and said skirt section being spaced from each other at their peripheries, and said retaining means being located in the space between said upper section and said skirt section;
- and
- (e) a ring defining an annular groove for engaging the peripheral sidewall of said retaining means between said ring and said annular member.
A two-piece piston for reciprocal movement within a cylinder of an internal combustion engine comprising:
- (a) an upper section having depending boss means and an open, underside portion therewithin;
- (b) a skirt section below said upper section;
- (c) means engaging said boss means and said skirt section for holding said upper section and said skirt section in assembled relationship with said upper section and said skirt section being spaced from each other at their peripheries;
- (d) a separate fluid coolant-retaining means disposed in the space between said upper section and said skirt section, said retaining means having a bottom portion defining a passage therethrough for said depending boss means, said passage in said bottom portion being surrounded by walls extending upwardly from said bottom portion, peripheral sidewalls extending upwardly from said bottom portion and spaced from said walls surrounding said passage, said retaining means having a passage for fluid coolant directed under pressure from beneath said upper section to said underside portion through said retaining means, said walls cooperating with said bottom portion to define an open top to retain coolant therein and to allow the coolant to be splashed upwardly to the underside of the upper section during operation of said piston in an internal combustion engine;
- (e) said upper section having an annular member extending substantially entirely about the entire circumference at a lower portion of said upper section;
- and
- (f) means for securing said retaining means to said annular member, said securing means including an upper portion of said peripheral sidewalls rolled over an upper surface of said annular member.
Dependencies are inferred from the claim text.