Patent US4708029A successfully refreshed from Google Patents.
US4708029A
Expired / Lapsed
US
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Camshaft
Assignee: Nippon Piston Ring Co Ltd
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Filing: 1986-12-15
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Granted: 1987-11-24
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Expires: 2006-12-15
Abstract
Abstract A fabricated camshaft having individual lobes mounted on tubular collars that are in turn mounted on an internal tubular member that is expanded between the collars to form bearing journals for the camshaft.
Inventors
- 👤 Shigeru Urano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:52
CPC Classifications
F; F16; F16H; F16H53/00; F16H53/02; F16H53/025; F01; F01L; F01L1/00; F01L1/02; F01L1/04; F01L1/047; F01L2001/0475; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49805; Y10T29/49826; Y10T29/49908; Y10T29/49938; Y10T29/4994; Y10T74/00; Y10T74/21; Y10T74/2101
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
147 words
A camshaft for use in an internal combustion engine comprising: a plurality of cam lobes adapted for operating the valves of an internal combustion engine, said lobes each having an opening therethrough, said opening being aligned generally with the axis of rotation of said lobe; and a central lobe supporting member, said member being comprised of a plurality of tubular collars disposed to fit within said openings in said lobes, the ends of said collars being spaced one from the other to form at least one circumferential gap, said central lobe supporting member further including a central tubular member expanded within said collars, said central tubular member being expanded within said gap to form bearing journals for said cam shaft, each of said collars including a notch on at least one end thereof, each said notch being disposed to engage a portion of said central tubular member.
Claim 2
Dependent Claim
147 words
A camshaft for use in an internal combustion engine comprising: a plurality of cam lobes adapted for operating the valves of an internal combustion engine, said lobes each having an opening therethrough, said opening being aligned generally with the axis of rotation of said lobe; and a central lobe supporting member, said member being comprised of a plurality of tubular collars disposed to fit within said openings in said lobes, the ends of said collars being spaced one from the other to form at least one circumferential gap, said central lobe supporting member further including a central tubular member expanded within said collars, said central tubular member being expanded within said gap to form bearing journals for said cam shaft, each of said collars including a notch on at least one end thereof, each said notch being disposed to engage a portion of said central tubular member.
Claim 3
Dependent Claim
14 words
The camshaft of claim 1 wherein said cam lobes are formed of sintered metal.
Claim 4
Dependent Claim
140 words
A camshaft for use in an internal combustion engine comprising: a plurality of cam lobes adapted for operating the valves of an internal combustion engine, said lobes each having an opening therethrough, said opening being aligned generally with the axis of rotation of said lobe; and a central lobe supporting member, said member being comprised of a plurality of tubular collars disposed to fit within said openings in said lobes, the ends of said collars being spaced one from the other to form at least one circumferential gap, said central lobe supporting member further including a central tubular member expanded within said collars, said central tubular member being expanded within said gap to form bearing journals for said cam shaft, wherein each end of each of said collars includes a notch engaging an expanded portion of said central tubular member.
Claim 5
Dependent Claim
140 words
A camshaft for use in an internal combustion engine comprising: a plurality of cam lobes adapted for operating the valves of an internal combustion engine, said lobes each having an opening therethrough, said opening being aligned generally with the axis of rotation of said lobe; and a central lobe supporting member, said member being comprised of a plurality of tubular collars disposed to fit within said openings in said lobes, the ends of said collars being spaced one from the other to form at least one circumferential gap, said central lobe supporting member further including a central tubular member expanded within said collars, said central tubular member being expanded within said gap to form bearing journals for said cam shaft, wherein each end of each of said collars includes a notch engaging an expanded portion of said central tubular member.
Claim 6
Dependent Claim
144 words
A cam shaft for use in an internal combustion engine comprising: a plurality of cam lobes adapted for operating the valves of an internal combustion engine, said lobes each having an opening therethrough, said opening being aligned generally with the axis of rotation of said lobe; and a central lobe supporting member, said member being comprised of a plurality of tubular collars disposed to fit within said openings of said lobes, each of said collars having two ends spaced apart from each other to form at least one circumferential gap, said central lobe supporting member further including a central tubular member expanded within said collars, an end of each of said collars including a notch engaging an expanded portion of said central tubular member, said central tubular member being expanded within each of said circumferential gaps to form bearing journals for said cam shaft.
Claim 7
Dependent Claim
144 words
A cam shaft for use in an internal combustion engine comprising: a plurality of cam lobes adapted for operating the valves of an internal combustion engine, said lobes each having an opening therethrough, said opening being aligned generally with the axis of rotation of said lobe; and a central lobe supporting member, said member being comprised of a plurality of tubular collars disposed to fit within said openings of said lobes, each of said collars having two ends spaced apart from each other to form at least one circumferential gap, said central lobe supporting member further including a central tubular member expanded within said collars, an end of each of said collars including a notch engaging an expanded portion of said central tubular member, said central tubular member being expanded within each of said circumferential gaps to form bearing journals for said cam shaft.
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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) | 1990-11-23 | 1991-05-25 | 1991-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-11-23 | 1995-05-25 | 1995-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-11-23 | 1999-05-25 | 1999-11-24 | $7700.00 | Window Closed / Lapsed |