US4297784A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for mounting motor stators
Assignee: ITT Inc
•
Filing: 1979-11-26
•
Granted: 1981-11-03
•
Expires: 1999-11-26
Abstract
Abstract A complete stator of an electric motor is mounted into a cylindrical sheet metal housing by first mounting the stator between two facing concentric mandrels. The housing, the inner diameter of which is less than the outer diameter of the stator is heated and then mounted over the mandrels and stator. After cooling, the stator and the mandrels are secured in the housing by shrinkage tension. By a smooth rolling of the housing surfaces contacting the mandrels, the tension is released and the mandrels are withdrawn.
Inventors
- 👤 Selmer Vagman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:26
CPC Classifications
H; H02; H02K; H02K15/00; H02K15/02; H02K15/028; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49009; Y10T29/49826; Y10T29/49863; Y10T29/49865
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
178 words
A method for mounting a complete motor stator in a surrounding cylindrical housing, comprising the steps of: sliding the stator on top of a flanged mandrel, the rib diameter of which corresponds to the inner diameter of the stator and the flange diameter approximately corresponds with the outer diameter of the stator to form a first bearing guide for the stator housing; sliding a second mandrel into a guiding portion of the first mandrel so that the first and second mandrels form a concentric mandrel unit having a space in which the coils of the stator are disposed, an outer diameter of the second mandrel forming a second bearing guide for the stator housing; heating a cylindrical stator housing, the nominal inner diameter of which is somewhat less than the outer diameters of the stator and first and second mandrels to expand said housing; sliding the heated and expanded housing over the mandrel unit; cooling said housing whereby the housing is shrunk-fit around the mandrel unit and stator; and loosening and removing said mandrels from the stator housing.
Claim 2
Independent Claim
178 words
A method for mounting a complete motor stator in a surrounding cylindrical housing, comprising the steps of: sliding the stator on top of a flanged mandrel, the rib diameter of which corresponds to the inner diameter of the stator and the flange diameter approximately corresponds with the outer diameter of the stator to form a first bearing guide for the stator housing; sliding a second mandrel into a guiding portion of the first mandrel so that the first and second mandrels form a concentric mandrel unit having a space in which the coils of the stator are disposed, an outer diameter of the second mandrel forming a second bearing guide for the stator housing; heating a cylindrical stator housing, the nominal inner diameter of which is somewhat less than the outer diameters of the stator and first and second mandrels to expand said housing; sliding the heated and expanded housing over the mandrel unit; cooling said housing whereby the housing is shrunk-fit around the mandrel unit and stator; and loosening and removing said mandrels from the stator housing.
Claim 3
Dependent Claim
62 words
A method for mounting a complete motor stator in a surrounding cylindrical formed housing as described in claim 1 wherein the step of loosening and removing the mandrels from the housing is accomplished by rolling the surfaces of the housing that make contact with the flanges of the mandrel to thereby release the shrinking tension so that the mandrels may be removed.
Claim 4
Dependent Claim
44 words
A method for mounting a complete motor stator in a surrounding cylindrical formed housing as described in claim 1 wherein the step of loosening and removing the mandrels comprises the step of pressing air between the contact surfaces of the mandrels and the housing.
Claim 5
Dependent Claim
46 words
A method for mounting a complete motor stator in a surrounding cylindrical formed housing as described in claim 1 wherein the step of loosening and removing the mandrels comprises the step of pressing an oil film between the contact surfaces of the mandrels and the housing.
Claim 6
Dependent Claim
40 words
A method for mounting a complete motor stator in a surrounding cylindrical formed housing as described in claim 1, additionally including the step of rolling grooves in the mantle surface of the housing whereby the housing is made more rigid.
References Cited (Backward Citations)
US2911709A
Cited
US3555651A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-11-02 | 1985-05-04 | 1985-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-02 | 1989-05-04 | 1989-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-02 | 1993-05-04 | 1993-11-03 | $7700.00 | Window Closed / Lapsed |