To improve durability, increase torque, and improve magnetic noise resistance by forming a rotary shaft of a DC motor for driving a valve for a hot water supply machine with the torque transmitted from a transmitting part by an iron material, and supporting one end thereof by a resin made receiving part arranged on a case.
When a DC motor 1 is driven by a control signal from an outside control circuit, its rotation is transmitted to a rotary shaft 2, a warm gear 3, and the like in order, and a valve for the hot water supply machine is driven by a knurled groove part of an output gear. In this case, a rotary shaft 2 of the DC motor 1 is formed longer by an iron material such as, for example, SUS, bearing steel, and SK material. A tip end part of the rotary shaft 2 is supported by a resin made receiving part 12A made of, for example, polyacetal, nylon, and the like which is arranged on a lower case 12. A load torque to the warm gear 3 is increased, and a supporting part is prevented from abrading at once by force generated in a horizontal direction of the warm gear 3.
AOTA HIRONOBU
HIGUCHI MOTOHIRO
