JPH0288468U - - Google Patents

Description

[Brief explanation of drawings]

Fig. 1 is an exploded perspective view showing an embodiment of the present invention, Fig. 2 is a sectional view of the same, Fig. 3 is an exploded perspective view of the main part of the same, Fig. 4 is a sectional view of the main part of the same, and Fig. 5 6 is an exploded perspective view showing a conventional example, and FIG. 6 is a sectional view of the same. 3... Housing, 11... Rotor magnet, 12... Rotating shaft, 13... Holder, 16... Output shaft, 16a... Pin, 17... Washer, 17a... Holding part, 17b... Preload spring piece, 18... Engaging groove, 21...Stator coil.

Claims (1)

[Scope of utility model registration request] a rotor magnet with multiple magnetic poles in the rotation direction;
A stepping motor includes a stator in which a plurality of stator coils are arranged spaced apart in the rotational direction of a rotor magnet in a housing, and a cylindrical rotating shaft is integrally provided in the center of the rotor magnet. A holding body made of a synthetic resin molded product is fixed to one side of the rotor magnet with a rotating shaft protruding, and on the other side of the rotor magnet, the surface of the holding body is approximately parallel to the surface of the rotor magnet. An engagement groove that is longer than the inner diameter of the rotary shaft is formed in the diametrical direction of the rotor magnet, and a pin is provided protruding from the circumferential surface of the output shaft that is inserted into the rotary shaft from the other side of the rotor magnet. A stepping motor in which a holding part of a washer is sandwiched between the inner circumferential surface of the engagement groove and the above-mentioned pin, and a preload spring piece extending from the washer makes elastic contact with a member fixed at a fixed position in the housing. .