US3930472A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite oil-cooled piston for an internal combustion engine
Assignee: MAN AG
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Filing: 1974-09-11
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Granted: 1976-01-06
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Expires: 1994-09-11
Abstract
Abstract The piston head is hollowed for a central coolant cavity and for an outer annular coolant cavity separated by a ridge by which the head is supported on the piston body. An outer shoulder also supports the skirt part of the head on the piston body. The piston body has an upper part hollowed in the center to form part of the central coolant cavity and a lower part having a wrist pin bearing with coolant recesses in the bearing, which are connected by coolant channels leading to the annular cavity in the head. The wrist pin in the bearing has channels connecting a coolant supply channel in the piston rod to the center of the wrist pin and thence to the bearing recesses.
Inventors
- 👤 Gernot Athenstaedt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:20
CPC Classifications
F; F02; F02F; F02F3/00; F02F3/0015; F02F3/0023; F02B; F02B23/00; F02B23/02; F02B23/06; F02B23/0696; F02F3/003; F02F3/16; F02F3/20; F02F3/22; F01; F01M; F01M1/00; F01M1/08; F01M2001/086; F02B3/00; F02B3/06; F02F7/00; F02F2007/0097; F05; F05C; F05C2201/00; F05C2201/02; F05C2201/021; F05C2201/04; F05C2201/0433; F05C2201/0448; F05C2251/00; F05C2251/04; F05C2251/042; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
241 words
A composite oil-cooled piston for an internal combustion engine, comprising: a piston head (1) having a piston face and a piston skirt with seating means for piston rings, said piston head having an annular support ridge (6) on its underside separated from said piston skirt by an annular cooling cavity (29) and surrounding a central cooling cavity (27); a piston carrier body (8) having an upper part (12) of approximately hollow cone shape having an upper surface (7) on which said annular ridge (6) of said piston head is directly supported, the hollow center of said upper part forming said central cooling cavity (27) with said piston head, said carrier body (8) further having a lower part (9) having a wrist pin bearing (10) therein including a load bearing surface (18) and providing coolant recesses (33,38), said carrier body having coolant channels respectively connecting said recesses with said annular cavity, and a piston wrist pin (11,56) in said bearing and a piston rod (17) fastened to said wrist pin on a surface opposite the load surface (18) of said bearing (10), said piston rod having an interior coolant supply channel (37) and said wrist pin (11,56) having channels therein (34,36) with axes in a plane (35) passing through the piston axis (A--A), said channels all being oblique to said axis at angles between 30° and 60°, and providing coolant paths from said supply channel in said piston rod to said recesses.
Claim 2
Dependent Claim
241 words
A composite oil-cooled piston for an internal combustion engine, comprising: a piston head (1) having a piston face and a piston skirt with seating means for piston rings, said piston head having an annular support ridge (6) on its underside separated from said piston skirt by an annular cooling cavity (29) and surrounding a central cooling cavity (27); a piston carrier body (8) having an upper part (12) of approximately hollow cone shape having an upper surface (7) on which said annular ridge (6) of said piston head is directly supported, the hollow center of said upper part forming said central cooling cavity (27) with said piston head, said carrier body (8) further having a lower part (9) having a wrist pin bearing (10) therein including a load bearing surface (18) and providing coolant recesses (33,38), said carrier body having coolant channels respectively connecting said recesses with said annular cavity, and a piston wrist pin (11,56) in said bearing and a piston rod (17) fastened to said wrist pin on a surface opposite the load surface (18) of said bearing (10), said piston rod having an interior coolant supply channel (37) and said wrist pin (11,56) having channels therein (34,36) with axes in a plane (35) passing through the piston axis (A--A), said channels all being oblique to said axis at angles between 30° and 60°, and providing coolant paths from said supply channel in said piston rod to said recesses.
Claim 3
Dependent Claim
43 words
A composite piston as defined in claim 1 in which said wrist pin (11,56) is provided with coolant distribution channels (39,40) for cooling said wrist pin which do not penetrate into the layer of said wrist pin bearing against said bearing surface (18).
Claim 4
Dependent Claim
38 words
A composite piston as defined in claim 1 in which said piston head is provided with an annular shoulder (13) adjacent to said piston skirt for supporting said piston head on the edge of said carrier body (8).
Claim 5
Dependent Claim
40 words
A composite piston as defined in claim 1 in which said coolant channels (32) between said recesses (33,38) and said annular cavity (26) are straight and run at an angle between 0° and 25° to the axis of said piston.
Claim 6
Dependent Claim
52 words
A composite piston as defined in claim 1 in which connection channel means (41) are provided for circulation of coolant between said annular cavity (26) and said central cavity (27) and in which said central cavity (27) is provided with at least one outlet channel (42) to the exterior of the piston.
Claim 7
Dependent Claim
24 words
A composite piston as defined in claim 1 in which said carrier body (8) is provided with integral sliding members (15) on its periphery.
Claim 8
Dependent Claim
24 words
A composite piston as defined in claim 1 in which sliding members (15) are removably fastened to said carrier body (8) by expansion screws.
Claim 9
Dependent Claim
30 words
A composite piston as defined in claim 1 in which a sliding skirt member in frame form (45) is pivotally mounted on the outer ends of said wrist pin (56).
Claim 10
Dependent Claim
26 words
A composite piston as defined in claim 1 in which said wrist pin (11, 56) and said piston rod (17) are fastened together with expansion screws.
Claim 11
Dependent Claim
17 words
A composite piston as defined in claim 1 in which said piston head is made of steel.
Claim 12
Dependent Claim
23 words
A composite piston as defined in claim 1 in which said carrier body (8) is made of a metal consisting principally of aluminum.
Claim 13
Dependent Claim
26 words
A composite piston as defined in claim 1 in which said wrist pin (11,56) bears directly against the material of which said carrier (8) is made.
Claim 14
Dependent Claim
26 words
A composite piston as defined in claim 1 in which said piston head (1) and said carrier body (8) are demountably fastened together by screws (49).
Claim 15
Dependent Claim
30 words
A composite piston as defined in claim 8 in which said sliding skirt body (45) is provided with reinforcing ribs (46) on its interior opposite the sliding surfaces (44) thereof.
Claim 16
Dependent Claim
27 words
A composite piston as defined in claim 1 in which tapered and inwardly extending cavities (24) are provided on both ends (23) of said wrist pin (11,56).
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-01-05 | 1979-07-07 | 1980-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-05 | 1983-07-07 | 1984-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-05 | 1987-07-07 | 1988-01-06 | $7700.00 | Window Closed / Lapsed |