Abnormality-detecting device in a brake system
First Claim
1. In a vehicle brake system of the type comprising a braking rotary element of magnetic flux absorbing material which is adapted for rotation together with a wheel of a vehicle, a brake shoe disposed adjacent to said braking rotary element, faced relative to said braking rotary element and having a braking frictional lining element thereon, and an abnormality-detecting device for sensing the existence of an abnormal condition in said vehicle brake system, the improvement comprising:
- a resonance circuit comprising a pick-up coil wound about a core made of a thermomagnetic material secured to the brake shoe for detecting a thickness displacement of and a temperature change in said braking frictional lining element of said brake shoe as a variation of the inductance in said pick-up coil and a capacitor in parallel connection to said pick-up coil;
a high frequency oscillation circuit for generating a predetermined frequency;
a sensing circuit coupled to said high frequency oscillation circuit and to said resonance circuit for converting variation of the inductance in said pick-up coil into electric signals; and
an indicator means connected to said sensing circuit, for indicating said thickness displacement of and warning of a critical temperature rise in said braking frictional lining element in response to said electric signals.
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Abstract
Abnormality-detecting device of very compact structure for particular use in the vehicle brake system for detecting the amount of wear in the brake lining element and temperature rise in the brake system. Cumulative reductions in the effective thickness of the lining element are detected by measuring the coil inductance variation by a pick-up coil fixed to the brake shoe said coil also detects occurrence of a critical temperature rise in the brake system.
60 Citations
19 Claims
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1. In a vehicle brake system of the type comprising a braking rotary element of magnetic flux absorbing material which is adapted for rotation together with a wheel of a vehicle, a brake shoe disposed adjacent to said braking rotary element, faced relative to said braking rotary element and having a braking frictional lining element thereon, and an abnormality-detecting device for sensing the existence of an abnormal condition in said vehicle brake system, the improvement comprising:
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a resonance circuit comprising a pick-up coil wound about a core made of a thermomagnetic material secured to the brake shoe for detecting a thickness displacement of and a temperature change in said braking frictional lining element of said brake shoe as a variation of the inductance in said pick-up coil and a capacitor in parallel connection to said pick-up coil; a high frequency oscillation circuit for generating a predetermined frequency; a sensing circuit coupled to said high frequency oscillation circuit and to said resonance circuit for converting variation of the inductance in said pick-up coil into electric signals; and an indicator means connected to said sensing circuit, for indicating said thickness displacement of and warning of a critical temperature rise in said braking frictional lining element in response to said electric signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification