US4949683A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tubular camshaft with lubricant passages
Assignee: Vitesco Technologies Lohmar Verwaltungs GmbH
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Filing: 1989-02-02
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Granted: 1990-08-21
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Expires: 2009-02-02
Abstract
Abstract A camshaft comprises a hollow tubular shaft (1) and an inner member (10) which may be in the form of a tube. The inner member is inserted within the tubular shaft so that a lubricant guiding space is defined between the tubular shaft and the inner member. The lubricant guiding space is connectable via radial bores (8 and 9). The inner member (10) is in supporting contact with the tubular shaft (1) in portions (11, 12, 13, 19) thereof.
Inventors
- 👤 Helmut Swars
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:13
CPC Classifications
F; F16; F16H; F16H53/00; F16H53/02; F16H53/025; F01; F01L; F01L1/00; F01L1/02; F01L1/04; F01L1/047; F01M; F01M9/00; F01M9/10; F01M9/102; F01L2001/0475; Y; Y10; Y10T; Y10T74/00; Y10T74/21; Y10T74/2101
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
97 words
A cam shaft comprising a hollow tubular shaft and an inner member received within the tubular shaft so that a lubricant guiding space is defined between the tubular shaft and the inner member and is connectable via radial bores in the tubular shaft to bearing regions on the outside of the tubular shaft and to at least one lubricant supply, wherein portions of the inner member are in supporting contact with the tubular shaft, the inner member having a circular cross-section in at least some of said portions which are in supporting contact with the tubular shaft.
Claim 2
Dependent Claim
97 words
A cam shaft comprising a hollow tubular shaft and an inner member received within the tubular shaft so that a lubricant guiding space is defined between the tubular shaft and the inner member and is connectable via radial bores in the tubular shaft to bearing regions on the outside of the tubular shaft and to at least one lubricant supply, wherein portions of the inner member are in supporting contact with the tubular shaft, the inner member having a circular cross-section in at least some of said portions which are in supporting contact with the tubular shaft.
Claim 3
Dependent Claim
99 words
A can shaft comprising a hollow tubular shaft and an inner member received within the tubular shaft so that a lubricant guiding space is defined between the tubular shaft and the inner member and is connectable via radial bores in the tubular shaft to bearing regions on the outside of the tubular shaft and to at least one lubricant supply, wherein portions of the inner member are in supporting contact with the tubular shaft, the inner member having at least one end portion of reduced cross-section which contacts the tubular shaft or a sleeve inserted into the tubular shaft.
Claim 4
Dependent Claim
99 words
A can shaft comprising a hollow tubular shaft and an inner member received within the tubular shaft so that a lubricant guiding space is defined between the tubular shaft and the inner member and is connectable via radial bores in the tubular shaft to bearing regions on the outside of the tubular shaft and to at least one lubricant supply, wherein portions of the inner member are in supporting contact with the tubular shaft, the inner member having at least one end portion of reduced cross-section which contacts the tubular shaft or a sleeve inserted into the tubular shaft.
Claim 5
Dependent Claim
101 words
A camshaft comprising a hollow tubular shaft and an inner member received within the tubular shaft so that a lubricant guiding space is defined between the tubular shaft and the inner member and is connectable via radial bores in the tubular shaft to bearing regions on the outside of the tubular shaft and to at least one lubricant supply, wherein portions of the inner member are in supporting contact with the tubular shaft, the inner member being in the form of a tube and at least some of said portions being established by expansions of the cross-section of the inner member.
Claim 6
Dependent Claim
101 words
A camshaft comprising a hollow tubular shaft and an inner member received within the tubular shaft so that a lubricant guiding space is defined between the tubular shaft and the inner member and is connectable via radial bores in the tubular shaft to bearing regions on the outside of the tubular shaft and to at least one lubricant supply, wherein portions of the inner member are in supporting contact with the tubular shaft, the inner member being in the form of a tube and at least some of said portions being established by expansions of the cross-section of the inner member.
Claim 7
Dependent Claim
14 words
A shaft according to claim 3, wherein the inner member is made of aluminium.
Claim 8
Dependent Claim
32 words
A shaft according to claim 3, wherein the inner member has between circular end portions a central longitudinal portion which is of non-circular cross-section and which makes contact with the tubular shaft.
Claim 9
Dependent Claim
41 words
A shaft according to claim 5, wherein the central longitudinal section of the inner member has cross-section in the shape of the outline of a clover leaf and forms with the tubular shaft longitudinal channels which communicate with the radial bores.
Claim 10
Dependent Claim
23 words
A shaft according to claim 3, wherein the inner member has portions of circular cross-section and at least one portion of non-circular cross-section.
Claim 11
Dependent Claim
46 words
A shaft according to claim 3, wherein the inner member is in the form of a tube into which is inserted a ball which makes a clamping fit with the inner member in a region of supporting contact between the inner member and the tubular shaft.
Claim 12
Dependent Claim
49 words
A shaft according to claim 3, wherein the inner member is in the form of a tube into which is inserted at least one spiral spring which makes a clamping fit with the inner member in a region of supporting contact between the inner member and the tubular shaft.
Claim 13
Dependent Claim
47 words
A shaft according to claim 3, wherein the inner member is in the form of a tube and a plug pressed into the tube deforms the tube to produce a form-fitting engagement between the tube and recesses in the tubular shaft or a sleeve inserted into it.
Claim 14
Dependent Claim
23 words
A shaft according to claim 3, wherein the inner member is in the form of a tube made of a plastically deformable material.
Claim 15
Dependent Claim
14 words
A shaft according to claim 11, wherein the plastically deformable material is steel plate.
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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) | 1993-08-20 | 1994-02-19 | 1994-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-08-20 | 1998-02-19 | 1998-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-08-20 | 2002-02-19 | 2002-08-21 | $7700.00 | Window Closed / Lapsed |