US3869938A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cam shaft for reciprocable piston internal combustion engines
Assignee: Kloeckner Humboldt Deutz AG
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Filing: 1973-06-27
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Granted: 1975-03-11
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Expires: 1993-06-27
Abstract
Abstract A cam shaft which is formed by radially expanding portions of a cylindrical steel pipe and reinforced by a further pipe coaxial with the steel pipe and supportingly engaging unexpanded portions of the steel pipe on the inside thereof.
Inventors
- 👤 Heinz Schlotterbeck
- 👤 Walter Staake
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:28
CPC Classifications
F; F01; F01L; F01L1/00; F01L1/02; F01L1/04; F01L1/047; Y; Y10; Y10T; Y10T74/00; Y10T74/21; Y10T74/2101
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
85 words
A cam shaft, especially for internal combustion engines comprising: a cylindrical steel pipe having axial regions thereof expanded radially to form eccentric cam portions, and a cylindrical reinforcing element coaxially disposed inside said steel pipe and having the radially outer surface thereof in supporting engagement with the cylindrical inner surface of said steel pipe on opposite axial sides of the respective said eccentric cam portions, and counterbalancing weights disposed inside said cam portions in those regions thereof disposed nearest the axis of said cam shaft.
Claim 2
Dependent Claim
85 words
A cam shaft, especially for internal combustion engines comprising: a cylindrical steel pipe having axial regions thereof expanded radially to form eccentric cam portions, and a cylindrical reinforcing element coaxially disposed inside said steel pipe and having the radially outer surface thereof in supporting engagement with the cylindrical inner surface of said steel pipe on opposite axial sides of the respective said eccentric cam portions, and counterbalancing weights disposed inside said cam portions in those regions thereof disposed nearest the axis of said cam shaft.
Claim 3
Dependent Claim
85 words
A cam shaft, especially for internal combustion engines comprising: a cylindrical steel pipe having axial regions thereof expanded radially to form eccentric cam portions, and a cylindrical reinforcing element coaxially disposed inside said steel pipe and having the radially outer surface thereof in supporting engagement with the cylindrical inner surface of said steel pipe on opposite axial sides of the respective said eccentric cam portions, and counterbalancing weights disposed inside said cam portions in those regions thereof disposed nearest the axis of said cam shaft.
Claim 4
Dependent Claim
85 words
A cam shaft, especially for internal combustion engines comprising: a cylindrical steel pipe having axial regions thereof expanded radially to form eccentric cam portions, and a cylindrical reinforcing element coaxially disposed inside said steel pipe and having the radially outer surface thereof in supporting engagement with the cylindrical inner surface of said steel pipe on opposite axial sides of the respective said eccentric cam portions, and counterbalancing weights disposed inside said cam portions in those regions thereof disposed nearest the axis of said cam shaft.
Claim 5
Dependent Claim
46 words
A cam shaft according to claim 1 in which said reinforcing element is in the form of a single piece of further pipe that extends the entire length of said cam shaft, said steel pipe also being in the form of a single piece of pipe.
Claim 6
Dependent Claim
53 words
A cam shaft according to claim 1 in which said reinforcing element is in the form of a further pipe extending the entire length of said cam shaft, said cam shaft being formed from individual axial sections of steel pipe and distributed in coaxial relation in the axial direction of said further pipe.
Claim 7
Dependent Claim
29 words
A cam shaft according to claim 1 in which the steel pipe from which said cam shaft is formed is fixedly connected to said reinforcing element as by welding.
Claim 8
Dependent Claim
36 words
A cam shaft according to claim 1 in which said reinforcing element protrudes from at least one end of said steel pipe and is adapted for having a member for driving the cam shaft mounted thereon.
Claim 9
Dependent Claim
30 words
A cam shaft according to claim 1 in which said reinforcing element is in the form of a further pipe, and means closing the opposite ends of said further pipe.
Claim 10
Dependent Claim
31 words
A cam shaft according to claim 1 in which said reinforcing element protrudes from both ends of said steel pipe and is adapted to engage support bearing for the cam shaft.
References Cited (Backward Citations)
US2202330A
Cited
US2892254A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-10 | 1978-09-09 | 1979-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-10 | 1982-09-09 | 1983-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-10 | 1986-09-09 | 1987-03-11 | $7700.00 | Window Closed / Lapsed |