US4291614A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piston and process for its manufacture
Assignee: Alcan Aluminiumwerk Nuernberg GmbH
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Filing: 1979-06-25
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Granted: 1981-09-29
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Expires: 1999-06-25
Abstract
Abstract An internal combustion engine piston is fitted with bushes between its piston pin and the cross bore in the piston. The diameters of the piston pin and the piston cross bore are dimensioned independently of each other to meet the requirements imposed upon them, which allows the piston pin to be dimensioned only to such size as is required to withstand the bending stress imposed by the connecting rod, thus permitting the size of the piston pin and the reciprocating mass to be reduced in relation to conventional practice.
Inventors
- 👤 Egon Molle
- 👤 Fritz Rosch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 01:23
CPC Classifications
F; F16; F16J; F16J1/00; F16J1/10; F16J1/14; F16J1/16; B; B23; B23P; B23P15/00; B23P15/10; Y; Y10; Y10T; Y10T403/00; Y10T403/32; Y10T403/32606; Y10T403/32861; Y10T403/32918; Y10T403/32926
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
98 words
A piston, in particular for internal combustion engines, having a piston pin bore receiving an essentially rigid, cylindrical piston pin which serves to secure a piston rod, wherein between the pin and the bore, at or near the two ends of the pin, cylindrical bushings are provided which float rotatably in the piston pin bore, and means are provided for preventing axial displacement of the bushings beyond the ends of the pin, characterized in that the bushings are disposed floatingly on the piston pin and the external diameter of the bushings diminishes towards the axis of the piston.
Claim 2
Dependent Claim
98 words
A piston, in particular for internal combustion engines, having a piston pin bore receiving an essentially rigid, cylindrical piston pin which serves to secure a piston rod, wherein between the pin and the bore, at or near the two ends of the pin, cylindrical bushings are provided which float rotatably in the piston pin bore, and means are provided for preventing axial displacement of the bushings beyond the ends of the pin, characterized in that the bushings are disposed floatingly on the piston pin and the external diameter of the bushings diminishes towards the axis of the piston.
Claim 3
Dependent Claim
22 words
Piston according to claim 1, characterised in that at least a portion of the external surface of the bushings is continuously tapered.
Claim 4
Dependent Claim
30 words
A piston according to claim 1, wherein the cylindrical walls of the bushings taper in longitudinal section at the end of each bushing nearer to the axis of the piston.
Claim 5
Dependent Claim
14 words
A piston according to claim 3 wherein the taper angle is 6 to 20'.
Claim 6
Dependent Claim
23 words
A piston according to claim 1 wherein the bushings are made of a material of greater strength than the material of the piston.
Claim 7
Dependent Claim
38 words
A piston according to claim 1, in which spring elements, acting in the axial direction of the piston pin, are provided between a connecting rod mounted on the piston pin and the adjacent end face of each bushing.
Claim 8
Dependent Claim
40 words
A piston according to claim 1, wherein the displacement-preventing means comprises stop elements which are secured in the bore for the piston pin and are so disposed that the bushings each bear, at their outer end, against said stop elements.
Claim 9
Dependent Claim
31 words
A piston according to claim 7 wherein each bushing has an inwardly turned lip at its outer end, said lips bearing respectively against the two end faces of the piston pin.
Claim 10
Dependent Claim
16 words
A piston according to claim 7, wherein each stop element is a circlip of rectangular cross-section.
Claim 11
Dependent Claim
133 words
A piston, in particular for internal combustion engines, having a piston pin bore receiving an essentially rigid, cylindrical piston pin which serves to secure a piston rod, wherein between the pin and the bore, at or near the two ends of the pin, cylindrical bushings are provided which float rotatably in the piston pin bore, and means are provided beyond each end of the pin for preventing axial displacement of the bushings beyond the ends of the pin, characterized in that the bushings are disposed floatingly on the piston pin, wherein each of said bushings has an in-turned flange at its outer end, interposed between and engaging the end of the pin at which the bushing is disposed and the displacement-preventing means beyond that pin end, for preventing axial displacement of the bushings.
Claim 12
Dependent Claim
133 words
A piston, in particular for internal combustion engines, having a piston pin bore receiving an essentially rigid, cylindrical piston pin which serves to secure a piston rod, wherein between the pin and the bore, at or near the two ends of the pin, cylindrical bushings are provided which float rotatably in the piston pin bore, and means are provided beyond each end of the pin for preventing axial displacement of the bushings beyond the ends of the pin, characterized in that the bushings are disposed floatingly on the piston pin, wherein each of said bushings has an in-turned flange at its outer end, interposed between and engaging the end of the pin at which the bushing is disposed and the displacement-preventing means beyond that pin end, for preventing axial displacement of the bushings.
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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) | 1984-09-28 | 1985-03-30 | 1985-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-28 | 1989-03-30 | 1989-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-28 | 1993-03-30 | 1993-09-29 | $7700.00 | Window Closed / Lapsed |