US4408959A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ceramic radial turbine wheel
Assignee: Volkswagen AG
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Filing: 1980-04-17
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Granted: 1983-10-11
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Expires: 2000-04-17
Abstract
Abstract A ceramic turbine wheel (1), especially such a wheel intended for an exhaust gas driven turbine of a turbocharger for motor vehicles, comprises a body portion (3), blades (2) and hub portion (4). The body portion (4), and optionally the hub portion (3) as well, are provided with hollow central cores (5, 6).
Inventors
- 👤 William D. Long
- 👤 Paul J. Rottenkolber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:14
CPC Classifications
F; F01; F01D; F01D5/00; F01D5/02; F01D5/04; F01D5/043; F01D5/048; F01D5/12; F01D5/28; F01D5/284
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
134 words
A radial ceramic turbine wheel, comprising: (a) a body portion, symmetrical about an axis; (b) a plurality of blades, integral with and extending outwardly from the body portion; and (c) a hub portion, integral and coaxial with the body portion, symmetrical about the axis, and connectable with a turbine shaft; characterized in that the body portion is provided with a hollow central core, on the side of the body portion opposite the hub portion; in that the blades extend outwardly partly from the hollow central core of the body portion, and partly from the solid part of the body portion; and in that the axial length of that part of the hollow central core of the body portion from which the blades extend does not exceed 60% of the axial length of the blades.
Claim 2
Dependent Claim
134 words
A radial ceramic turbine wheel, comprising: (a) a body portion, symmetrical about an axis; (b) a plurality of blades, integral with and extending outwardly from the body portion; and (c) a hub portion, integral and coaxial with the body portion, symmetrical about the axis, and connectable with a turbine shaft; characterized in that the body portion is provided with a hollow central core, on the side of the body portion opposite the hub portion; in that the blades extend outwardly partly from the hollow central core of the body portion, and partly from the solid part of the body portion; and in that the axial length of that part of the hollow central core of the body portion from which the blades extend does not exceed 60% of the axial length of the blades.
Claim 3
Dependent Claim
35 words
A ceramic turbine wheel according to claim 1, characterized in that the outer diameter of the hollow central core of the body portion does not exceed 60% of the smallest diameter of the body portion.
Claim 4
Dependent Claim
37 words
A ceramic turbine wheel according to claim 1, characterized in that the body portion has, at the side adjacent to the hub portion, an outer diameter of about 50% of the outer diameter of the turbine wheel.
Claim 5
Dependent Claim
37 words
A ceramic turbine wheel according to claim 1, characterized in that the body portion has, at the side opposite to the hub portion, an outer diameter of about 25% of the outer diameter of the turbine wheel.
Claim 6
Dependent Claim
16 words
A ceramic turbine wheel according to claim 1, characterized in that the hub portion is cylindrical.
Claim 7
Dependent Claim
32 words
A ceramic turbine wheel according to claim 5, characterized in that the hub portion has a diameter of from about 15 to about 20% of the outer diameter of the turbine wheel.
Claim 8
Dependent Claim
29 words
A ceramic turbine wheel according to claim 5, characterized in that the hub portion has an axial length which does not exceed twice the diameter of the hub portion.
Claim 9
Dependent Claim
41 words
A ceramic turbine wheel according to claim 5, wherein the hub portion is formed integrally with a ceramic shaft, the shaft being cylindrical, and of a length of from about 6 to about 12 times the diameter of the hub portion.
Claim 10
Dependent Claim
15 words
A ceramic turbine wheel according to claim 8, wherein the shaft is a hollow cylinder.
Claim 11
Dependent Claim
15 words
A ceramic turbine wheel according to claim 8, wherein the shaft is a solid cylinder.
Claim 12
Dependent Claim
19 words
A ceramic turbine wheel according to claim 5, characterized in that the hub portion has a hollow central core.
Claim 13
Dependent Claim
32 words
A ceramic turbine wheel according to claim 11, characterized in that the hollow central core of the hub portion has a diameter not exceeding 60% of the diameter of the hub portion.
Claim 14
Dependent Claim
33 words
A ceramic turbine wheel according to claim 11, characterized in that the hollow central core of the hub portion has an axial length not exceeding 60% of the length of the hub portion.
Claim 15
Dependent Claim
23 words
A ceramic turbine wheel according to claim 11, characterized in that the hollow central core of the hub portion has a rounded bottom.
Claim 16
Dependent Claim
38 words
A ceramic turbine wheel according to claim 5, characterized in that the transition from the hub portion to the body portion is rounded off with a radius of at least 20% of the diameter of the hub portion.
Claim 17
Dependent Claim
16 words
A ceramic turbine wheel according to claim 1, characterized in that the hub portion is conical.
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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) | 1986-10-10 | 1987-04-11 | 1987-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-10 | 1991-04-11 | 1991-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-10 | 1995-04-11 | 1995-10-11 | $7700.00 | Window Closed / Lapsed |