Title:
ROTATIONAL SPEED DETECTOR AND VALVE TIMING DETECTOR USING THIS ROTATIONAL SPEED DETECTOR
Document Type and Number:
Japanese Patent JP3965710
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a rotational speed detector, which can surely detect a rotational speed by having noise resistance and high reliability, and a valve timing detector using this rotational speed detector.
SOLUTION: A permanent magnet 6 is provided, which makes a yoke 7, 8 capable of integrally rotating by attracting the yoke 8 to a side of the yoke 7 with an inflow of magnetic flux to a side of the yoke 8 in a location where the yokes 7, 8 are opposed adjacent, on the other hand, a DC exciting coil 12 is fixedly arranged, which makes the coil 7, 8 capable of relatively rotating by adjusting attraction force by the permanent magnet with an inflow of magnetic flux to a side of the yoke 8 in an arrangement side thereof. Further, in a magnetic flux route of the permanent magnet in the yoke 8 and the exciting coil, a rotary surface, such as periodically changing an air gap between a side of the yoke 8 and a side of the exciting coil according to rotation of the yoke 8, is provided, by counting a frequency of sinusoidal wave induction voltage generated in the exciting coil, a rotational speed of the yoke 7 is detected.
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Inventors:
Jiro Kondo
Tsutomu Shimizu
Yasuo Uozaki
Tsutomu Shimizu
Yasuo Uozaki
Application Number:
JP25931396A
Publication Date:
August 29, 2007
Filing Date:
September 30, 1996
Export Citation:
Assignee:
Mazda Corporation Inc
International Classes:
F02D35/00; G01P3/488; F01L1/34; F01L1/46; F01L13/00; F02D13/02; F02D45/00; F02P7/067; (IPC1-7): F02D35/00; F01L1/46; F01L13/00; F02D13/02; F02D45/00; F02P7/067; G01P3/488
Domestic Patent References:
| JP61054526U | ||||
| JP59231226A | ||||
| JP58089620U | ||||
| JP63171676U | ||||
| JP63178636U | ||||
| JP63053323A | ||||
| JP6159392A | ||||
| JP5187209A | ||||
| JP8326572A |
Attorney, Agent or Firm:
Hiroshi Maeda
Hiroshi Koyama
Hiroshi Takeuchi
Yuji Takeuchi
Katsumi Imae
Tomoo Harada
Hiroshi Koyama
Hiroshi Takeuchi
Yuji Takeuchi
Katsumi Imae
Tomoo Harada
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