Patent US5226791A successfully refreshed from Google Patents.
US5226791A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Structure of a rotor shaft and method of making same
Assignee: Mazda Motor Corp
•
Filing: 1991-09-27
•
Granted: 1993-07-13
•
Expires: 2011-09-27
Abstract
Abstract In an apparatus accommodating a rotor of light alloy and a rotor shaft of steel secured to each other, the rotor shaft consists of a first shaft and a pair of second shafts integrally formed with or rigidly secured to the first shaft. The first shaft has a structure with a thermal coefficient of expansion close to that of the rotor whereas each of the second shafts has a structure with a thermal coefficient of expansion less than that of the first shaft.
Inventors
- 👤 Yoshihisa Miwa
- 👤 Katsunori Hanakawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:11
CPC Classifications
F; F04; F04C; F04C29/00; F04C29/0042; F04C29/0078; F16; F16C; F16C13/00; F16C3/00; F16C3/02; F16C2360/00; F16C2360/43; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49316; Y10T29/49318; Y10T29/49718; Y10T29/49732; Y10T29/49734; Y10T29/49737; Y10T29/49742
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
186 words
In an apparatus accommodating a rotor of light alloy and a rotor shaft of steel secured to each other, said rotor shaft comprising: a first shaft having a structure with a thermal coefficient of expansion close to that of the rotor for mounting the rotor thereon; and a pair of second shafts adapted to be carried by respective bearings and integrally formed with and rigidly secured to said first shaft, each of said second shafts having a structure with a thermal coefficient of expansion less than that of said first shaft and wherein said first and second shafts are made of different steels and wherein said first shaft is made of a steel containing carbon of 0.7-1.1% by weight, silicon of 1.5-2.5% by weight, and manganese of 0.5-2.0% by weight and having a composite structure containing bainite and retained austenite of 20% or more by volume, and each of said second shafts is made of a steel containing carbon of 0.6% or less by weight and silicon of 0.5% or less by weight and having a structure containing retained austenite of 10% or less by volume.
Claim 2
Dependent Claim
186 words
In an apparatus accommodating a rotor of light alloy and a rotor shaft of steel secured to each other, said rotor shaft comprising: a first shaft having a structure with a thermal coefficient of expansion close to that of the rotor for mounting the rotor thereon; and a pair of second shafts adapted to be carried by respective bearings and integrally formed with and rigidly secured to said first shaft, each of said second shafts having a structure with a thermal coefficient of expansion less than that of said first shaft and wherein said first and second shafts are made of different steels and wherein said first shaft is made of a steel containing carbon of 0.7-1.1% by weight, silicon of 1.5-2.5% by weight, and manganese of 0.5-2.0% by weight and having a composite structure containing bainite and retained austenite of 20% or more by volume, and each of said second shafts is made of a steel containing carbon of 0.6% or less by weight and silicon of 0.5% or less by weight and having a structure containing retained austenite of 10% or less by volume.
Claim 3
Independent Claim
98 words
A method of making a rotor shaft on which a rotor of light alloy is securely mounted, said method comprising the steps of: making a first shaft by the use of steel containing carbon of 0.7-1.1% by weight, silicon of 1.5-2.5% by weight, and manganese of 0.5-2.0% by weight; making a pair of second shafts by the use of steel containing carbon of 0.6% or less by weight and silicon of 0.5% or less by weight; welding said second shafts to opposite ends of said first shaft to make the rotor shaft; and austempering the entire rotor shaft.
Claim 4
Independent Claim
98 words
A method of making a rotor shaft on which a rotor of light alloy is securely mounted, said method comprising the steps of: making a first shaft by the use of steel containing carbon of 0.7-1.1% by weight, silicon of 1.5-2.5% by weight, and manganese of 0.5-2.0% by weight; making a pair of second shafts by the use of steel containing carbon of 0.6% or less by weight and silicon of 0.5% or less by weight; welding said second shafts to opposite ends of said first shaft to make the rotor shaft; and austempering the entire rotor shaft.
Claim 5
Dependent Claim
182 words
In an apparatus accommodating a rotor of light alloy and a rotor shaft of steel secured to each other, said rotor shaft comprising: a first shaft having a structure with a thermal coefficient of expansion close to that of the rotor for mounting the rotor thereon; and a pair of second shafts adapted to be carried by respective bearings and rigidly secured to said first shaft, each of said second shafts having a structure with a thermal coefficient of expansion less than that of said first shaft and wherein said first and second shafts are made of different steels and wherein said first shaft is made of a steel containing carbon of 0.7-1.1% by weight, silicon of 1.5-2.5% by weight, and manganese of 0.5-2.0% by weight and having a composite structure containing bainite and retained austenite of 20% or more by volume, and each of said second shafts is made of a steel containing carbon of 0.6% or less by weight and silicon of 0.5% or less by weight and having a structure containing retained austenite of 10% or less by volume.
Claim 6
Dependent Claim
182 words
In an apparatus accommodating a rotor of light alloy and a rotor shaft of steel secured to each other, said rotor shaft comprising: a first shaft having a structure with a thermal coefficient of expansion close to that of the rotor for mounting the rotor thereon; and a pair of second shafts adapted to be carried by respective bearings and rigidly secured to said first shaft, each of said second shafts having a structure with a thermal coefficient of expansion less than that of said first shaft and wherein said first and second shafts are made of different steels and wherein said first shaft is made of a steel containing carbon of 0.7-1.1% by weight, silicon of 1.5-2.5% by weight, and manganese of 0.5-2.0% by weight and having a composite structure containing bainite and retained austenite of 20% or more by volume, and each of said second shafts is made of a steel containing carbon of 0.6% or less by weight and silicon of 0.5% or less by weight and having a structure containing retained austenite of 10% or less by volume.
References Cited (Backward Citations)
CA632304A
Cited
US1745854A
Cited
US3048505A
Cited
US3470037A
Cited
US3337376A
Cited
US4302658A
Cited
US4971536A
Cited
JPH0193338A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-07-12 | 1997-01-11 | 1997-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-07-12 | 2001-01-11 | 2001-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-07-12 | 2005-01-11 | 2005-07-13 | $7700.00 | Window Closed / Lapsed |