JPH0588182U - Geared motor - Google Patents

Abstract

(57) [Abstract] [Purpose] In a geared motor, simplify the method of fixing the spiral spring for eliminating backlash. [Structure] The motor body is housed inside, the rotational torque is transmitted to the output shaft via the gear train, and one end of a spiral spring that applies a rotational load torque to the output gear in one rotation direction is fixed and the outer end is fixed. It is characterized by a structure in which it is bent in a ring shape and the bent portion is fixed to a cylindrical projection portion of an intermediate plate which is housed in a groove forming an output gear and a stopper mechanism.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention contains a motor body inside a case made of synthetic resin, and has a high-precision resolution that can control the rotational position accuracy of the output shaft via a gear train that changes the rotation of the motor rotor. To a geared motor having

[0002]

[Prior Art]

 The general fixing structure of a spiral spring that applies a rotational load torque in one rotation direction is adhesive fixing with an adhesive or fixing by caulking or press fitting.

[0003]

[Problems to be solved by the device]

 Above, in the case of the conventional method, there are problems such as adhesive management, drying time, and adhesion to other parts because they are bonded with an adhesive.In addition, caulking and press fitting require jigs and spaces, and workability is improved. There was a point that workability was poor.

[0004]

[Means for Solving the Problems]

 In order to solve the above problem, one end of a spiral spring that applies a rotational load torque in one rotation direction is fixed to the output gear in the gear train, the outer end is bent into a ring shape, and the bent portion is restored to the output gear. An object of the present invention is to provide a structure for fixing a spiral spring of a geared motor, which is characterized in that the structure is fixed to a cylindrical protrusion of an intermediate plate which is housed in a groove forming a stopper mechanism having a movable rotation angle of less than 180 °.

[0005]

【Example】

 FIG. 1 is a vertical sectional view showing an embodiment of a geared motor of the present invention. FIG. 2 is a plan view showing the internal structure.

The outer shape shows a flat cylindrical shape by the upper case 1 and the lower case 2. The output shaft 3 of the motor is rotatably supported by the upper case 1 and the lower case 2, and projects outward from the end surface on the upper case 1 side. The output gear 4 fixed to the output shaft 3 meshes with the intermediate gear 5 of the preceding stage, and the intermediate gear 5 meshes with the pinion gear 8 fixed to the magnet 7 by the rotor 6, respectively. Is rotatably supported by.

The stator units 9 and 9 ′ that surround the rotor 6 have a structure in which two coils 10 and an outer yoke 11 and an inner yoke 12 are superposed on each other, and the bobbin 13 of the coil 10 is electrically connected to the outside. Terminal pins 14 are individually provided. The terminal pin 14 extends through the lower case 2 and outside the motor in parallel with the output shaft 3. Further, the groove 4'which is a part of the output gear 4 fixed to the output shaft 3 is provided between the output shaft 3 and the projection 15 'which is a part of the middle plate 15 which is constrained by the lower case 2 coaxially. Then, the output shaft 3 contacts at 180 ° for one rotation, and the rotation angle of the output shaft 3 for rotation by the rotation of the rotor 6 becomes 180 °.

In the geared motor, since backlash occurs between the reduction gears, a spiral spring 16 is provided between the intermediate plate 15 and the output gear 4 in order to remove the backlash, and the annular portion 16 at the outer end of the spiral spring 16 is provided. 'Is fixed to the cylindrical protrusion 15' of the intermediate plate 15, and the other vertically bent portion 16 "is set in the hole 4" of the output gear 4.

FIG. 3 is a perspective view showing the spiral spring of the present invention.

[0010]

[Effect of the device]

 In the present invention, one end of a spiral spring that applies a rotational load torque in one rotation direction is fixed to the output gear in the gear train, and the outer end is bent into a ring shape so that the bent portion can return to the output gear. Since the structure is fixed to the cylindrical protrusion of the middle plate that fits in the groove that forms the stopper mechanism with an angle of less than 180 °, it can be easily set with one touch between the output gear and the middle plate, and processing such as adhesive, caulking and press fitting The process can be eliminated, which has the excellent effects of reducing man-hours, space saving, and thinness.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of a geared motor of the present invention.

FIG. 2 is a plan view of an internal structure showing an embodiment of the geared motor of the present invention.

FIG. 3 is a perspective view showing a spiral spring of the geared motor of the present invention.

[Explanation of symbols]

 1 upper case 2 lower case 3 output shaft 4 output gear 4'groove 4 "hole 5 intermediate gear 6 rotor 7 magnet 8 pinion gear 9 stator unit 9'stator unit 10 coil 11 outer yoke 12 inner yoke 13 bobbin 14 terminal pin 15 middle Plate 15 'Protrusion 16 Spiral spring 16' Ring portion 16 "Vertical bending portion

Claims (1)

[Scope of utility model registration request] 1. A geared motor in which a motor serving as a power source and a motor shaft drive an output shaft to reciprocally rotate via a gear train, and in the gear train, a rotation load in one rotation direction is applied to an output gear. Cylindrical projection part of the middle plate that fixes one end of a spiral spring that applies torque and bends the outer end into a ring shape, and the bent part is housed in a groove that forms a stopper mechanism that can return to the output gear and less than 180 ° Geared motor characterized by being fixed to.