Patent US3774982A successfully refreshed from Google Patents.
US3774982A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bearing device for rotary machines
Assignee: Hitachi Ltd
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Filing: 1971-12-02
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Granted: 1973-11-27
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Expires: 1991-12-02
Abstract
Abstract A bearing device for rotary machines, e.g. motors for vehicles, which is so designed as to prevent air from flowing through a bearing element and thereby to prevent intrusion of water droplets and dust into said bearing element. This bearing device is particularly adapted for use in supporting the portion of the rotary shaft of a rotary machine penetrating through the housing of the rotary machine and comprises a dust seal having a fan effect provided at a portion located exterior to the rotary machine. The fan effect of the dust seal offsets the flow of air otherwise passing through the bearing element from the exterior to the interior of the rotary machine under the influence of negative pressure created within the rotary machine during operation, whereby the instrusion of dust and water droplets, present in the atmosphere, into the bearing element is prevented and movement of a lubricant within the bearing element into the rotary machine is also prevented.
Inventors
- 👤 T Nakamura
- 👤 H Egawa
- 👤 S Kawai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:48
CPC Classifications
F; F16; F16C; F16C33/00; F16C33/72; F16C33/76; F16C33/80; H; H02; H02K; H02K5/00; H02K5/04; H02K5/16; H02K5/173; H02K5/1732; F16C19/00; F16C19/22; F16C19/24; F16C19/26; F16C2380/00; F16C2380/26
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
102 words
A bearing device for rotary machines comprising a rotary shaft extending outwardly through a wall of a rotary machine, bearing means mounted in said wall and supporting said rotary shaft at a portion penetrating through said wall, and bearing covers covering an inner and an outer side of said bearing means with each cover having a peripheral portion located close to said rotary shaft, and a dust seal including a fan means provided exteriorly adjacent to the outer end of a slight gap formed between an outer one of said bearing covers with respect to the rotary machine and said rotary shaft.
Claim 2
Dependent Claim
102 words
A bearing device for rotary machines comprising a rotary shaft extending outwardly through a wall of a rotary machine, bearing means mounted in said wall and supporting said rotary shaft at a portion penetrating through said wall, and bearing covers covering an inner and an outer side of said bearing means with each cover having a peripheral portion located close to said rotary shaft, and a dust seal including a fan means provided exteriorly adjacent to the outer end of a slight gap formed between an outer one of said bearing covers with respect to the rotary machine and said rotary shaft.
Claim 3
Dependent Claim
39 words
A bearing device for rotary machines, according to claim 1, wherein inner ends of the slight gaps formed between said bearing covers and said rotary shaft respectively communicate with each other by a channel extending around said bearing means.
Claim 4
Dependent Claim
23 words
A bearing device for rotary machines, according to claim 1, wherein an outer periphery of said dust seal includes a water receiving trough.
Claim 5
Dependent Claim
23 words
A bearing device for rotary machines, according to claim 2, wherein an outer periphery of said dust seal includes a water receiving trough.
Claim 6
Dependent Claim
129 words
A bearing device for rotary machines comprising a rotary shaft extending outwardly through a wall of a rotary machine, bearing means mounted in said wall supporting said rotary shaft at a portion penetrating through said wall, ring members fixedly mounted on said rotary shaft for securely holding an inner race of said bearing means in a fixed position on said rotary shaft, and bearing covers covering an inner and an outer side of said bearing means with each cover having a peripheral portion located close to said rotary shaft, and a dust seal including fan means provided exteriorly adjacent the outer end of a slight gap formed between an outer one of said bearing covers and an outer one of said ring members with respect to the rotary machine.
Claim 7
Dependent Claim
129 words
A bearing device for rotary machines comprising a rotary shaft extending outwardly through a wall of a rotary machine, bearing means mounted in said wall supporting said rotary shaft at a portion penetrating through said wall, ring members fixedly mounted on said rotary shaft for securely holding an inner race of said bearing means in a fixed position on said rotary shaft, and bearing covers covering an inner and an outer side of said bearing means with each cover having a peripheral portion located close to said rotary shaft, and a dust seal including fan means provided exteriorly adjacent the outer end of a slight gap formed between an outer one of said bearing covers and an outer one of said ring members with respect to the rotary machine.
Claim 8
Dependent Claim
39 words
A bearing device for rotary machines, according to claim 5, wherein inner ends of the slight gaps formed between said bearing covers and said ring members, respectively, communicate with each other by a channel extending around said bearing means.
Claim 9
Dependent Claim
23 words
A bearing device for rotary machines, according to claim 5, wherein an outer periphery of said dust seal includes a water receiving trough.
Claim 10
Dependent Claim
29 words
A bearing device for rotary machines, according to claim 5, wherein slight gaps formed between said bearing covers and said ring members respectively are crooked to form labyrinth seals.
Claim 11
Dependent Claim
29 words
A bearing device for rotary machine, according to claim 6, wherein slight gaps formed between said bearing covers and said ring members respectively are crooked to form labyrinth seals.
Claim 12
Dependent Claim
23 words
A bearing device for rotary machines, according to claim 6, wherein an outer peripherY of said dust seal includes a water receiving trough.
Claim 13
Dependent Claim
29 words
A bearing device for rotary machines, according to claim 7, wherein slight gaps formed between said bearing covers and said ring members respectively are crooked to form labyrinth seals.
Claim 14
Dependent Claim
23 words
A bearing device for rotary machines, according to claim 8, wherein an outer periphery of said dust seal includes a water receiving trough.
Claim 15
Dependent Claim
18 words
A bearing device for rotary machines, according to claim 1, wherein said bearing means includes a roller bearing.
Claim 16
Dependent Claim
18 words
A bearing device for rotary machines, according to claim 1, wherein said bearing means includes a ball bearing.
Claim 17
Dependent Claim
33 words
A bearing device for rotary machines, according to claim 1, wherein gaps formed between said peripheral portion of said bearing cover and said rotary shaft are crooked in order to form labyrinth seals.
Claim 18
Dependent Claim
18 words
A bearing device for rotary machines, according to claim 5, wherein said bearing means includes a roller bearing.
Claim 19
Dependent Claim
18 words
A bearing device for rotary machines, according to claim 5, wherein said bearing means includes a ball bearing.
References Cited (Backward Citations)
GB808502A
Cited
US3663077A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |