Patent US3334568A successfully refreshed from Google Patents.
Patent US4496134A successfully refreshed from Google Patents.
US4496134A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary solenoid actuator
Assignee: Toyota Motor Corp
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Filing: 1981-08-27
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Granted: 1985-01-29
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Expires: 2001-08-27
Abstract
Abstract A rotary solenoid actuator for proportionally controlling the flow of fluid, such as air, in a pipe comprises a housing with a rotor rotatably mounted thereon. A stationary coreless coil for generating a magnetic field in response to a control current therethrough is mounted in the housing. A permanent magnet is affixed to a rotatably mounted shaft within the coil, and a return spring is attached to the rotating shaft. Due to low hysteresis in the coreless coil, there is a linear relationship between the control current and the fluid flow.
Inventors
- 👤 Takaharu Idogaki
- 👤 Hisasi Kawai
- 👤 Kyo Hattori
- 👤 Kazuhiro Sakurai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:57
CPC Classifications
F; F16; F16K; F16K31/00; F16K31/02; F16K31/06; F16K31/0682
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
163 words
A rotary solenoid actuator for proportionally controlling the flow of fluid in a pipe, comprising: a housing mounted on said pipe; a coreless coil, attached to said housing, for generating a magnetic field in response to a control current flowing therethrough, said coreless coil having two coaxial coil sections; a rotatable shaft disposed in a space between the coil sections of said coreless coil and having a longitudinal axis that is approximately perpendicular to the magnetic axis of said coreless coil; a rotatable permanent magnet fixed coaxially to said rotatable shaft and disposed within said coreless coil; a return spring having one end attached to said shaft and the other end attached to said housing; and a valve rotor rotatably disposed within the housing, the valve rotor being fixed to said rotatable shaft and being coaxial to said rotatable permanent magnet, and wherein said rotatable shaft is a hollow shaft, and said return spring comprises a torsion bar disposed within said hollow shaft.
Claim 2
Dependent Claim
163 words
A rotary solenoid actuator for proportionally controlling the flow of fluid in a pipe, comprising: a housing mounted on said pipe; a coreless coil, attached to said housing, for generating a magnetic field in response to a control current flowing therethrough, said coreless coil having two coaxial coil sections; a rotatable shaft disposed in a space between the coil sections of said coreless coil and having a longitudinal axis that is approximately perpendicular to the magnetic axis of said coreless coil; a rotatable permanent magnet fixed coaxially to said rotatable shaft and disposed within said coreless coil; a return spring having one end attached to said shaft and the other end attached to said housing; and a valve rotor rotatably disposed within the housing, the valve rotor being fixed to said rotatable shaft and being coaxial to said rotatable permanent magnet, and wherein said rotatable shaft is a hollow shaft, and said return spring comprises a torsion bar disposed within said hollow shaft.
Claim 3
Dependent Claim
29 words
A rotary solenoid actuator according to claim 1 wherein said coreless coil is divided into two parts so as to accommodate said rotatable permanent magnet between said two parts.
Claim 4
Dependent Claim
17 words
A rotary solenoid actuator according to claim 1, further comprising screw means for adjusting said return spring.
Claim 5
Dependent Claim
25 words
A rotary solenoid actuator according to claim 1, further comprising at least one bobbin surrounding said permanent magnet and on which said coil is wound.
Claim 6
Dependent Claim
21 words
A rotary solenoid actuator according to claim 4 wherein the bobbin comprises an aluminum structure having a coating of insulating material.
Claim 7
Dependent Claim
24 words
A rotary solenoid actuator according to claim 1 wherein said valve rotor has two openings opposed to each other and alignable with said pipe.
References Cited (Backward Citations)
CA634529A
Cited
US2405429A
Cited
US2473939A
Cited
US2872154A
Cited
US2841779A
Cited
US3054426A
Cited
US3206160A
Cited
US3323548A
Cited
US3861644A
Cited
US4135119A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-01-29 | 1988-07-30 | 1989-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-29 | 1992-07-30 | 1993-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-29 | 1996-07-30 | 1997-01-29 | $7700.00 | Window Closed / Lapsed |