US5346432A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Driveshaft with additional masses
Assignee: GKN Driveline International GmbH
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Filing: 1991-08-28
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Granted: 1994-09-13
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Expires: 2011-08-28
Abstract
Abstract The invention has a driveshaft (6, 8a, 8b and 10), especially used in the drive line of a motor vehicle (1), with a tubular shaft which has a central tube region (R m ) and end pieces (11 and 12) formed on both ends. For optimizing the torsional characteristics of the driveshaft (6, 8a, 8b and 10), it includes at least one mass element (13) which is formed by reducing the inner diameter (D i ) and/or increasing the outer diameter (D a ) of the shaft wall. These additional mass elements (13) may be arranged symmetrically or asymmetrically in the axial direction of the driveshaft (6, 8a, 8b and 10). If the additional mass elements are arranged asymmetrically, the center of gravity is displaced, thereby optimizing the driveshaft 6, 8a, 8b and 10) of certain vehicle types with respect of its natural frequencies.
Inventors
- 👤 Klaus Greulich
- 👤 Peter Amborn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:42
CPC Classifications
F; F16; F16C; F16C3/00; F16C3/02; B; B60; B60K; B60K17/00; B60K17/22; F16F; F16F15/00; F16F15/10; F16C2326/00; F16C2326/01; F16C2326/06
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
216 words
A one piece driveshaft formed by deformation comprising: a tubular shaft comprising a central portion, a pair of transition portions adjacent said central portion, and a pair of end portions, each end portion including a toothed receiving portion for connection with torque transmitting means, said tubular shaft showing symmetry of rotation and having a circumferential wall defining an internal central bore passing through said shaft; and at least one mass element integrally connected to and axially positioned along said central tube portion, said mass element unitarily formed with said shaft as a radially thickened wall portion, said wall of said shaft in said transition portions being conical between said central portion and said end portions internally and externally and said wall of said shaft in said central portion being of uniform circumferential thickness with the exception of the area of said at least one mass element and said wall in said central portion having a uniform circumferential thickness and an increased outer diameter or a decreased diametrical central bore in the area of said at least one mass element and said end portion central bore having a constant diameter which is smaller than the diameter of the central portion central bore and said at least one mass element maintains the symmetry of rotation of the driveshaft.
Claim 2
Dependent Claim
216 words
A one piece driveshaft formed by deformation comprising: a tubular shaft comprising a central portion, a pair of transition portions adjacent said central portion, and a pair of end portions, each end portion including a toothed receiving portion for connection with torque transmitting means, said tubular shaft showing symmetry of rotation and having a circumferential wall defining an internal central bore passing through said shaft; and at least one mass element integrally connected to and axially positioned along said central tube portion, said mass element unitarily formed with said shaft as a radially thickened wall portion, said wall of said shaft in said transition portions being conical between said central portion and said end portions internally and externally and said wall of said shaft in said central portion being of uniform circumferential thickness with the exception of the area of said at least one mass element and said wall in said central portion having a uniform circumferential thickness and an increased outer diameter or a decreased diametrical central bore in the area of said at least one mass element and said end portion central bore having a constant diameter which is smaller than the diameter of the central portion central bore and said at least one mass element maintains the symmetry of rotation of the driveshaft.
Claim 3
Dependent Claim
24 words
A driveshaft according to claim 1, wherein said at least one mass element is symmetrical to maintain axial symmetry of masses of the driveshaft.
Claim 4
Dependent Claim
27 words
A driveshaft according to claim 1, wherein the center of gravity of the driveshaft in a vehicle including drive components, points to drive components with greater mass.
Claim 5
Dependent Claim
20 words
A driveshaft according to claim 1, wherein said at least one mass element is arranged asymmetrically in the axial direction.
Claim 6
Dependent Claim
213 words
A one piece driveshaft formed by deformation comprising: a tubular shaft comprising a central portion, a pair of transition portions adjacent said central portion, and a pair of end portions, each end portion including a toothed receiving portion for connection with torque transmitting means, said tubular shaft showing symmetry of rotation and having a circumferential wall defining an internal central bore passing through said shaft; and at least one mass element integrally connected to and axially positioned along said central tube portion, said mass element unitarily formed with said shaft as a radially thickened wall portion, said wall of said shaft in said transition portions being conical between said central portion and said end portions internally and externally and said wall of said shaft in said central portion being of uniform circumferential thickness with the exception of the area of said at least one mass element and said wall in said central portion having a uniform circumferential thickness and an increased outer diameter or a decreased diametrical central bore in the area of said at least one mass element and said end portion central bore having a constant diameter which is smaller than the diameter of the central portion central bore, wherein said at least one mass element has a variable wall thickness.
Claim 7
Dependent Claim
213 words
A one piece driveshaft formed by deformation comprising: a tubular shaft comprising a central portion, a pair of transition portions adjacent said central portion, and a pair of end portions, each end portion including a toothed receiving portion for connection with torque transmitting means, said tubular shaft showing symmetry of rotation and having a circumferential wall defining an internal central bore passing through said shaft; and at least one mass element integrally connected to and axially positioned along said central tube portion, said mass element unitarily formed with said shaft as a radially thickened wall portion, said wall of said shaft in said transition portions being conical between said central portion and said end portions internally and externally and said wall of said shaft in said central portion being of uniform circumferential thickness with the exception of the area of said at least one mass element and said wall in said central portion having a uniform circumferential thickness and an increased outer diameter or a decreased diametrical central bore in the area of said at least one mass element and said end portion central bore having a constant diameter which is smaller than the diameter of the central portion central bore, wherein said at least one mass element has a variable wall thickness.
Claim 8
Dependent Claim
212 words
A one piece driveshaft formed by deformation comprising: a tubular shaft comprising a central portion, a pair of transition portions adjacent said central portion, and a pair of end portions, each end portion including a toothed receiving portion for connection with torque transmitting means, said tubular shaft showing symmetry of rotation and having a circumferential wall defining an internal central bore passing through said shaft; and at least one mass element integrally connected to and axially positioned along said central tube portion, said mass element unitarily formed with said shaft as a radially thickened wall portion, said wall of said shaft in said transition portions being conical between said central portion and said end portions internally and externally and said wall of said shaft in said central portion being of uniform circumferential thickness with the exception of the area of said at least one mass element and said wall in said central portion having a uniform circumferential thickness and an increased outer diameter or a decreased diametrical central bore in the area of said at least one mass element and said end portion central bore having a constant diameter which is smaller than the diameter of central portion central bore, wherein a plurality of additional mass elements are positioned on said shaft.
Claim 9
Dependent Claim
212 words
A one piece driveshaft formed by deformation comprising: a tubular shaft comprising a central portion, a pair of transition portions adjacent said central portion, and a pair of end portions, each end portion including a toothed receiving portion for connection with torque transmitting means, said tubular shaft showing symmetry of rotation and having a circumferential wall defining an internal central bore passing through said shaft; and at least one mass element integrally connected to and axially positioned along said central tube portion, said mass element unitarily formed with said shaft as a radially thickened wall portion, said wall of said shaft in said transition portions being conical between said central portion and said end portions internally and externally and said wall of said shaft in said central portion being of uniform circumferential thickness with the exception of the area of said at least one mass element and said wall in said central portion having a uniform circumferential thickness and an increased outer diameter or a decreased diametrical central bore in the area of said at least one mass element and said end portion central bore having a constant diameter which is smaller than the diameter of central portion central bore, wherein a plurality of additional mass elements are positioned on said 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) | 1997-09-12 | 1998-03-14 | 1998-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-09-12 | 2002-03-14 | 2002-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-09-12 | 2006-03-14 | 2006-09-13 | $7700.00 | Window Closed / Lapsed |