US4355959A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotation sensor of a swash-plate type compressor
Assignee: Toyota Industries Corp
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Filing: 1980-10-08
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Granted: 1982-10-26
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Expires: 2000-10-08
Abstract
Abstract A rotation sensor for sensing a swash-plate type compressor being in rotational state. An electromagnetic sensor including a permanent magnet and a coil disposed in the neighborhood thereof is fixed on a housing of the compressor such that it may be opposed to a part of a rotational locus described by a specific portion of the external periphery of the swash-plate. The electromagnetic sensor generates a signal pulse everytime the specific portion passes nearby. When the swash-plate is made of a non-magnetic material some magnetic body is fixed on the external periphery of the swash-plate for constituting a portion-to-be-sensed. This magnetic body may be a ring or lump of ferrous material, a temperature sensitive ferrite, a permanent magnet, etc.
Inventors
- 👤 Hiroya Kono
- 👤 Jun Hasegawa
- 👤 Mitsukane Inagaki
- 👤 Hisao Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:12
CPC Classifications
F; F04; F04B; F04B49/00; F04B49/20; F04B27/00; F04B27/08; F04B27/10; F04B27/1036; F04B49/06; F04B49/10; F04B49/103; F04B2201/00; F04B2201/12; F04B2201/1201; F04B2201/1206
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
136 words
A rotation sensor for a swash-plate type compressor which includes a housing with at least one cylinder bore, a rotary shaft rotatably retained by said housing, a swash-plate secured thereto in a slant posture, and at least one piston engaged with said swash-plate for being reciprocated in said cylinder bore according to the rotation of said swash-plate, said rotation sensor comprising: a part of the peripheral portion of said swash-plate as a portion-to-be-sensed; and an electromagnetic sensor disposed at a position opposed to a part of a movement locus described by said portion-to-be-sensed according to the rotation of said swash-plate for generating an electric signal respondent to variation of magnetic flux density caused by every passing of said portion-to-be-sensed close thereto, said electromagnetic sensor including a permanent magnet and a coil disposed in the vicinity thereof.
Claim 2
Dependent Claim
136 words
A rotation sensor for a swash-plate type compressor which includes a housing with at least one cylinder bore, a rotary shaft rotatably retained by said housing, a swash-plate secured thereto in a slant posture, and at least one piston engaged with said swash-plate for being reciprocated in said cylinder bore according to the rotation of said swash-plate, said rotation sensor comprising: a part of the peripheral portion of said swash-plate as a portion-to-be-sensed; and an electromagnetic sensor disposed at a position opposed to a part of a movement locus described by said portion-to-be-sensed according to the rotation of said swash-plate for generating an electric signal respondent to variation of magnetic flux density caused by every passing of said portion-to-be-sensed close thereto, said electromagnetic sensor including a permanent magnet and a coil disposed in the vicinity thereof.
Claim 3
Dependent Claim
53 words
A rotation sensor in accordance with claim 1, wherein said swash-plate is wholly made of a magnetic material and a pair of parts on the peripheral portion of the swash-plate positioned away from each other with a phase difference of approximately 180° and describing a same rotational locus are utilized as said portion-to-be-sensed.
Claim 4
Dependent Claim
33 words
A rotation sensor in accordance with claim 1, wherein said swash-plate is made of a non-magnetic material and a magnetic body secured to the peripheral portion of said swash-plate constitutes said portion-to-be sensed.
Claim 5
Dependent Claim
46 words
A rotation sensor in accordance with claim 3, wherein said magnetic body is secured at at least two places of the peripheral portion of said swash-plate which are positioned away from each other with a phase difference of approximately 180° and describe the same rotational locus.
Claim 6
Dependent Claim
25 words
A rotation sensor in accordance with claim 3, wherein said magnetic body is a ring of ferrous material fitted on the periphery of said swash-plate.
Claim 7
Dependent Claim
23 words
A rotation sensor in accordance with claim 3, wherein said magnetic body is a ferrous layer sprayed on the periphery of the swash-plate.
Claim 8
Dependent Claim
32 words
A rotation sensor in accordance with claim 3, wherein said magnetic body is a lump made of ferrous material, being imbedded in at least one place on the periphery of said swash-plate.
Claim 9
Dependent Claim
34 words
A rotation sensor in accordance with claim 3, wherein said magnetic body is a lump made of a temperature sensitive ferrite, being imbedded in at least on place on the periphery of said swash-plate.
Claim 10
Dependent Claim
26 words
A rotation sensor in accordance with claim 3, wherein said magnetic body is a pin of ferrous material for securing said swash-plate to said rotary shaft.
Claim 11
Dependent Claim
28 words
A rotation sensor in accordance with claim 3, wherein said magnetic body is a permanent magnet imbedded in at least one place on the periphery of said swash-plate.
Claim 12
Dependent Claim
17 words
A rotation sensor in accordance with claim 3, wherein said swash-plate is made of an aluminum alloy.
Claim 13
Dependent Claim
42 words
A rotation sensor in accordance with claim 1, wherein said housing is made of a non-magnetic material and said electromagnetic sensor is secured on the outside of said housing for being opposed to, with a wall of said housing inbetween, said portion-to-be-sensed.
Claim 14
Dependent Claim
37 words
A rotation sensor in accordance with claim 1, wherein said electromagnetic sensor is composed of a sensor body of non-magnetic material, a permanent magnet accommodated in said sensor body, and a coil wound about said permanent magnet.
Claim 15
Dependent Claim
73 words
A rotation sensor in accordance with claim 1, wherein said housing includes a pair of cylinder blocks joined face to face to each other on a plane perpendicular to the axis of said rotary shaft, and said electromagnetic sensor is fixedly placed in a pair of recesses which are respectively formed at a joined surface of each of said pair of cylinder blocks in a sandwiched state between said pair of cylinder blocks.
References Cited (Backward Citations)
US4017217A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-10-25 | 1986-04-26 | 1986-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-10-25 | 1990-04-26 | 1990-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-10-25 | 1994-04-26 | 1994-10-26 | $7700.00 | Window Closed / Lapsed |