| 摘要 |
PROBLEM TO BE SOLVED: To easily allow repair and replacement by providing a holding part on a part of a support plate member supported on a fixed wheel, inserting a synthetic resin sensor case with a sensor embedded and pressing the case and an outer side wall of the holding part by a U-shaped spring piece. SOLUTION: A support plate member 38 is supported by interference fit on an inner end of an outer wheel 23 being a fixed wheel. A holding part 42 is formed to swell out in an opposite direction to a tone wheel 14a on a part facing an outer peripheral half of the tone wheel 14a being a part of a wheel 39 constituting the member 38. A sensor is held being embedded in a sensor case 47 made of synthetic resin, wherein the case 47 is combined with a spring piece 48 and held in the holding part 42 without rattling. In the case of repairing or replacing the sensor, by strongly pulling the case 47 together with the spring piece 48 outward in a diameter direction of the member 38, the case 47 is removed from the holding part 42 together with the spring piece 48 so that it can be removed from the member 38. Thus the sensor can be easily repaired or replaced at a low cost. |
