Electricity: measuring and testing – Magnetic – Displacement
Patent
1997-07-01
2000-05-16
Snow, Walter E.
Electricity: measuring and testing
Magnetic
Displacement
324173, G01P 3488, G01B 730
Patent
active
060642009
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a direct connector type magnetic revolution sensor for detecting the number of revolutions of an axis of rotation in for example a car transmission.
BACKGROUND ART
A conventional magnetic revolution sensor is described referring to FIG. 7.
In FIG. 7, symbol 3 represents a connector block comprised of an insulation material. The connector block 3 comprises a bias magnet 7 fixed mechanically in one end, a magnetic detector 8 attached mechanically to said bias magnet, and a circuit section 5 electrically coupled with said magnetic detector 8 via a relay terminal 6 provided in said connector block 3. Also a cap 1 for protecting the magnetic detector 8 etc. is provided mechanically fixed to a flange 3a of said connector block 3. In the other end, being separated by said flange 3a, of said connector block 3 is a male connector section 3b which provides connector terminals 10 electrically coupled to said circuit section 5.
In the following, the operation will be described with reference to FIG. 8. When a revolving magnetic member 9 having a protrusion 9a comes close to the tip top of cap 1 a magnetic circuit is formed with said bias magnet 7 with said magnetic detector 8 in between. The density of magnetic flux to be given to said magnetic detector 8 varies depending on the relative positioning between said protrusion 9a and said bias magnet 7. The variation is converted into electrical signal, which is processed by said circuit section 5 to be outputted as a sensor signal from said male connector section 3b.
In the above described conventional direct connector type magnetic revolution sensor, however, the connector section had to be manufactured in accordance with varying specifications of customers. Which means the moulds have to be prepared for each of the customer specifications, and the reliability has to be confirmed for each of the sensors. This naturally gives an adverse effect on the time and the manpower, providing a negative influence on the product cost. Thus the performance per cost was low for a product manufactured by moulding process.
The present invention is aimed to solve the above described problems, and intended to present a reliable, yet inexpensive, magnetic revolution sensor in which the modification of connector specifications is easy.
DISCLOSURE OF THE INVENTION
A magnetic revolution sensor according to the present invention comprises a detection block, a cap for protecting the detection block, and a connector block having a flange provided with a space for installing said detection block and said cap, as well as connector terminals in the other end thereon separated by said flange, said detection block being electrically coupled with said connector terminals.
With the above described constitution, a magnetic revolution sensor can meet the varying connector specifications of many customers, by modifying only the connector block and the cap. The detection block, being the key component for the reliability, may be used as the common constituent component with which a sufficient reliability is established. Thus, when meeting a new requirement of a customer, a new magnetic revolution sensor may be made available by modifying only the connector block and the cap; suppressing the accompanying cost, and without sacrificing the reliability. The leadtime needed for the development is much reduced.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is an assembly chart showing a magnetic revolution sensor according to a first embodiment of the present invention.
FIG. 2 is a front view of the magnetic revolution sensor of FIG. 1.
FIG. 3 is a side view of the magnetic revolution sensor of FIG. 1.
FIG. 4 is an assembly chart showing a magnetic revolution sensor according to a second embodiment of the present invention.
FIG. 5 is a top view of a detection block of the magnetic revolution sensor of FIG. 4.
FIG. 6 is an assembly chart showing a magnetic revolution sensor according to a third embodiment of the present invention.
FIG. 7 is an assembly chart
REFERENCES:
patent: 5121289 (1992-06-01), Gagliardi
patent: 5414355 (1995-05-01), Davidson et al.
patent: 5416410 (1995-05-01), Kastler
patent: 5563510 (1996-10-01), Gorrell et al.
patent: 5631556 (1997-05-01), Shibata
Hattori Takamichi
Ishiai Yasushi
Jitosho Noriyuki
Saito Kiyoshi
Ueda Shinjiro
Matsushita Electric - Industrial Co., Ltd.
Snow Walter E.
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