Vehicle tire abnormality indicator with inductive coupling means
First Claim
1. A device for automatically detecting and indicating abnormal conditions in an pneumatic tire, mounted on a rim portion of a road wheel of a wheeled vehicle, including the tire internal pressure below a predetermined value and tire temperature above a predetermined value, comprising a tire condition sensor mounted on the rim portion and extending into the interior of the pneumatic tire to product an electric signal upon the occurence of tire abnormality;
- coupling means responsive to said electric signal comprising an annular primary coil secured to and extending along the inner periphery of the rim of the road wheel for rotation with the tire, said primary coil being electrically connected to said tire condition sensor, and an annular secondary coil attached to a relatively stationary portion of the vehicle and disposed adjacent to said primary coil, inwardly of said rim of said road wheel, said annular secondary coil being surrounded by said primary coil in concentric relationship therewith for continuous inductive coupling to said primary coil, whereby the secondary coil exhibits a marked inductance change when said tire condition sensor produces the electric signal;
detector means connected to the secondary coil to detect said marked inductance change; and
warning means connected to said detector means for warning the driver of the detected tire abnormality in response to the marked inductance change.
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Accused Products
Abstract
A sensor including a pressure switch and a thermistor mounted within the tire assembly for detecting a too low air pressure and excessive tire temperature is coupled to a detector unit, and a warning unit both mounted on the vehicle body, through concentrically disposed primary and secondary coils. The primary coil is secured on the inner periphery of the wheel rim and is electrically connected to the sensor. The secondary coil is secured on an axially extending portion of an annular support member which is fixed rigidly with respect to the axle support assembly.
27 Citations
4 Claims
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1. A device for automatically detecting and indicating abnormal conditions in an pneumatic tire, mounted on a rim portion of a road wheel of a wheeled vehicle, including the tire internal pressure below a predetermined value and tire temperature above a predetermined value, comprising a tire condition sensor mounted on the rim portion and extending into the interior of the pneumatic tire to product an electric signal upon the occurence of tire abnormality;
- coupling means responsive to said electric signal comprising an annular primary coil secured to and extending along the inner periphery of the rim of the road wheel for rotation with the tire, said primary coil being electrically connected to said tire condition sensor, and an annular secondary coil attached to a relatively stationary portion of the vehicle and disposed adjacent to said primary coil, inwardly of said rim of said road wheel, said annular secondary coil being surrounded by said primary coil in concentric relationship therewith for continuous inductive coupling to said primary coil, whereby the secondary coil exhibits a marked inductance change when said tire condition sensor produces the electric signal;
detector means connected to the secondary coil to detect said marked inductance change; and
warning means connected to said detector means for warning the driver of the detected tire abnormality in response to the marked inductance change.
- coupling means responsive to said electric signal comprising an annular primary coil secured to and extending along the inner periphery of the rim of the road wheel for rotation with the tire, said primary coil being electrically connected to said tire condition sensor, and an annular secondary coil attached to a relatively stationary portion of the vehicle and disposed adjacent to said primary coil, inwardly of said rim of said road wheel, said annular secondary coil being surrounded by said primary coil in concentric relationship therewith for continuous inductive coupling to said primary coil, whereby the secondary coil exhibits a marked inductance change when said tire condition sensor produces the electric signal;
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2. A device according to claim 1, wherein said relatively stationery portion of the vehicle includes an annular support portion on which said annular secondary coil is disposed and a back plate which supports said support portion.
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3. A device according to claim 2 wherein said annular support portion is secured to said back plate.
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4. A device according to claim 2, wherein saiD annular support portion is formed integrally with said back plate.
Specification
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- Resources
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Current AssigneeAkio Hosaka, Kiyoshi Wazawa
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Original AssigneeAkio Hosaka, Kiyoshi Wazawa
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InventorsHosaka, Akio, Wazawa, Kiyoshi
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Primary Examiner(s)Swann, III, Glen R.
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Application NumberUS05/344,486Time in Patent Office764 DaysField of Search340/58,57,52F 73/146.5US Class Current340/448CPC Class CodesB60C 23/043 using transformer type sign...B60C 23/0498 for rim attachments B60C23/...
