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US5013956A
Expired / Lapsed
US
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Lining material and ultrasonic wave driven motor using lining material
Assignee: Teijin Ltd
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Filing: 1989-03-20
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Granted: 1991-05-07
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Expires: 2009-03-20
Abstract
Abstract A lining material superior in abrasion-proof, considerably reducing the sliding sounds to be caused at high speeds, and an ultrasonic wave driven motor using the lining material (9) for the inverted face of a rotor (2). The lining material is composed of total aromatic polyamide pulp granule of a meta type and/or total aromatic polyamide fiber of a meta type as main comonents, being 3 through 40% in the percentage of voids. As the lining material (9) is used as the inverted face of the rotor portion (2) which comes into contact against the vibration amplifying portion (5) of the stator portion (1), so that the noises during the driving operation may be reduced, and also, the service life of the inverted face may be extended.
Inventors
- 👤 Seiji Kurozumi
- 👤 Shigenori Uda
- 👤 Masatake Hirai
- 👤 Katuhiro Murano
- 👤 Takeo Kimura
- 👤 Nobuyuki Yamamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:28
CPC Classifications
H; H02; H02N; H02N2/00; H02N2/10; H02N2/16; H02N2/166; H02N2/0005; H02N2/005; H02N2/0065; H02N2/007
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
16 words
A lining material composed of a meta-type aramid fibrid and meta-type aramid fiber as main components.
Claim 2
Dependent Claim
16 words
A lining material composed of a meta-type aramid fibrid and meta-type aramid fiber as main components.
Claim 3
Dependent Claim
61 words
A lining material in accordance with claim 1, wherein the meta-type aramid fibrid and meta-type aramid fiber is present in amounts of 50% through 100% by weight, a polytetrafluoroethylene resin is present in an amount 0% through 50% by weight, and flake graphite is present in amounts of 0% through 20% by weight, with these members being heated, compressed and molded.
Claim 4
Dependent Claim
17 words
A lining material in accordance with claim 1, wherein the percentage of voids is 3% through 40%.
Claim 5
Dependent Claim
77 words
An ultrasonic wave driven motor comprising a stator portion having an excitation portion having a vibration component and forming a driving face having abrasion-proof properties and tenacity therein, and a rotor portion having an inverted face, softer than the driving face and abrasion-resistant, is brought into contact against the driving face, wherein the lining material which is composed of a meta-type aramid fibrid and a meta-type aramid fiber as main components is provided on the inverted face.
Claim 6
Dependent Claim
77 words
An ultrasonic wave driven motor comprising a stator portion having an excitation portion having a vibration component and forming a driving face having abrasion-proof properties and tenacity therein, and a rotor portion having an inverted face, softer than the driving face and abrasion-resistant, is brought into contact against the driving face, wherein the lining material which is composed of a meta-type aramid fibrid and a meta-type aramid fiber as main components is provided on the inverted face.
Claim 7
Dependent Claim
68 words
An ultrasonic wave driven motor in accordance with claim 4, wherein the lining material is composed of a meta-type aramid fibrid and a meta-type aramid fiber present in an amount of 50% through 100% by weight, polytetrafluoroethylene resin present in an amount of 0% through 50% by weight, and flake graphite in an amount of 0% through 20% by weight, with these members being heated, compressed and molded.
Claim 8
Dependent Claim
22 words
An ultrasonic wave driven motor in accordance with claim 5, wherein the voids percentage of the lining material is 3% through 40%.
References Cited (Backward Citations)
US4736129A
Cited
EP0209865A2
Cited
JPS6223379A
Cited
US4739212A
Cited
EP0222394A2
Cited
JPS62114481A
Cited
JPS62114480A
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JPS62147979A
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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) | 1994-05-06 | 1994-11-05 | 1995-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-05-06 | 1998-11-05 | 1999-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-05-06 | 2002-11-05 | 2003-05-07 | $7700.00 | Window Closed / Lapsed |