JPH0518281U - Stepping motor - Google Patents

Abstract

(57) [Summary] [Purpose] The number of parts is reduced by attaching a shaft for mounting a gear mounted on the rotor shaft of a stepping motor and another gear meshing with this gear to a flange, We will also be able to contribute to cost reduction. [Structure] In a stepping motor 1, a bent portion 1 is provided around a flange 3 attached to a front end open portion of a case 2.
2 is provided, a step portion 11 is provided at the front end of the case 2, and the bent portion 12 is fitted into the step portion 11 to attach the flange 3 to the front surface of the case 2. At this time, the bent portion 12 forms a space t between the flange 3 and the front surface 10 a of the stator 10 fitted in the case 2. The caulking portion 7a of the shaft 7 is loosely inserted into the space t so that the shaft 7 can be fixedly mounted on the flange 3.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a stepping motor, and more particularly to a stepping motor in which a flange of a stepping motor is provided with a shaft of another gear that meshes with a gear axially attached to a rotor shaft of the stepping motor.

[0002]

[Prior Art]

 A conventional stepping motor of this type will be described with reference to FIGS. In the figure, a stepping motor 1 includes a bobbin around which a coil is wound, a stator on which the bobbin is assembled, a case 2 in which a rotor etc. loosely fitted in a central hole of the stator are housed, and the case. 2, a flange 3 attached to the front end open portion of the flange 2, and a rotor shaft 4 projecting from the center of the flange 3, and a gear 5 is attached to the shaft. Further, a motor mounting plate 6 is brought into contact with the flange 3, a shaft 7 is fixedly mounted on the motor mounting plate 6 by means of spot welding or the like, and the shaft 7 is attached to the rotor shaft 4 by a shaft. The gear 8 for meshing with the gear 5 was mounted on the shaft.

[0003]

[Problems to be solved by the device]

 In the above conventional example, since there is no space between the stator and the flange fitted inside the case, there is no shaft between the flange and the gear for meshing with the gear mounted on the rotor shaft. Etc. could not be fixed. Therefore, since the motor mounting plate on which the shaft is fixedly installed is separately provided and the motor mounting plate is mounted on the outer side surface of the flange, mounting of the stepping motor is troublesome, and the number of members increases, resulting in high cost. It is a factor.

Therefore, there arises a technical problem to be solved in order to obtain a stepping motor which can reduce the number of parts and contribute to cost reduction, and the present invention aims to solve the problem.

[0005]

[Means for Solving the Problems]

 This invention has been proposed in order to achieve the above object, and includes a bobbin around which a coil is wound, a stator on which the bobbin is assembled, and a rotor which is loosely fitted in the center hole of the stator. In a stepping motor consisting of a cylindrical case fitted inside and a flange attached to the front end open part of the cylindrical case, the stepping motor is stepped by cutting out the inner part of the front end open edge part of the case. And a bent portion is formed on the periphery of the flange attached to the front end open edge of the case, the bent portion is fitted to the stepped portion of the case, and the flange is folded. There is no stepping motor characterized in that a gear shaft for meshing with a gear mounted on a rotor shaft is fixed in a certain space between the rotor formed by the curved portion and the slata by means such as caulking. With .

[0006]

[Action]

 Between the stator, which is fitted inside the case of the stepping motor, and the flange which faces the case, by the bent portion of the peripheral edge of the flange which is fitted to the stepped portion of the front open end of the case. A certain space is formed. That is, since the inner surface of the bent portion at the peripheral portion of the flange fits into the stepped portion of the case and also presses the front surface of the peripheral portion of the stator, the intermediate portion of both the stator and the flange is pressed. At this point, a certain space will be formed. Therefore, by using this space, the end portion of the shaft of the other gear that meshes with the gear axially attached to the rotor shaft is inserted into the inner surface of the flange and caulked. In this way, the shaft can be fixed to the flange. Thus, since the caulking portion does not interfere with the stator at all, the stepping motor can be mounted well.

[0007]

【Example】

 An embodiment of the present invention will be described below with reference to the accompanying drawings. For convenience of explanation, the same reference numerals are used for the conventional example and the target part. FIG. 1 is a side view of the stepping motor 1, and FIG. 2 is a front view of the same. In the figure, 2 is a case, 3 is a flange, 4 is a rotor shaft, 5 is a gear axially mounted on the rotor shaft, and 7 is a shaft fixedly mounted on the flange 4. A rotor 10 (not shown) loosely fitted in a center hole of the stator 10 and a stator 10 to which the bobbin 9 of the gear is assembled is rotatably fitted in the shaft 7, and the rotor shaft 4 of the rotor is shown. The case 2 and the case 2 are pivotally attached to the flange 3 at substantially the center thereof.

Further, as shown in FIGS. 3 and 4, the case 2 is formed of a tubular body having an open front surface, and the open edge portion is notched in the inner portion to form a stepped portion 11. On the other hand, as shown in FIGS. 5 and 6, bent portions 12, 12 ... Bent to the case are provided at various places around the flange 3 attached to the open portion of the case. 12 ... is fitted to the stepped portion 11 of the case. Further, a part of the bent portions 12, 12, ... Also presses the peripheral portion of the front surface 10a of the stator 10 which is fitted in the case 2, so that the stator 10 is tightly fitted in the case 2.

As described above, the flange 3 in which the peripheral bent portions 12, 12, ... Are fitted to the stepped portion 11 of the case 2 has the edge of the case 2 caulked 13 to the peripheral bent portions 12, 12. , 13 ... and fix. Thus, a constant space t is formed between the front surface 10a of the stator 10 and the flange 3. Then, utilizing this space t, the end portion of the shaft 7 is fitted into the hole provided in the flange 3 and caulked 7a. In that case, since the shaft 7 is fixedly mounted on the flange 3 and does not interfere with the front surface 10a of the stator 10 at all, it does not hinder the assembly of the stepping motor 1. Thus, the gear 8 is attached to the shaft 7 so as to mesh with the gear 5 attached to the rotor shaft 4.

In the drawing, reference numeral 14 is a lead wire, and 15 is a holder of the lead wire. The holder 15 is configured to be fitted and exposed in the notch 2a provided in the case 2. Further, the present invention can be modified in various ways without departing from the spirit of the invention, and it goes without saying that the invention extends to the modified version.

[0011]

[Effect of the device]

 Since one embodiment of the present invention has a structure as described above, a hole is formed in a flange attached to the front surface of the case, a shaft is inserted into the hole, and the shaft is caulked to the flange on the back side of the flange. However, since the caulking portion is loosely inserted into a fixed space formed between the front surface of the stator fitted inside the case and the flange, it does not interfere with the stator at all. Without doing so, it will not hinder the assembly of the stepping motor at all. Thus, it is no longer necessary to provide a separate motor mounting plate and to fix pins on the motor mounting plate as in the conventional case, the stepping motor can be easily assembled, and it is possible to reduce the size and cost. It is indeed a device with various practical values, such as being possible.

[Brief description of drawings]

FIG. 1 is a side view of a stepping motor of the present invention.

FIG. 2 is a front view of FIG.

FIG. 3 is a front view of the case.

4 is a cross-sectional view taken along the line AA of FIG.

[Fig. 5] Front view of the flange

6 is a cross-sectional view taken along the line BB of FIG.

7 is a cross-sectional view taken along the line CC of FIG.

FIG. 8 is a front view showing a mounting state of a conventional stepping motor.

9 is a side view of FIG.

[Explanation of symbols]

 1 Stepping motor 2 Case 3 Flange 4 Rotor shaft 5 (8) Gear 7 Shaft 11 Stepped part 12 Bent part 13 Crimped part

Claims (1)

[Scope of utility model registration request] 1. A cylindrical case in which a bobbin wound with a coil, a stator assembled with the bobbin, and a rotor loosely fitted in a center hole of the stator are internally fitted, and a front end of the cylindrical case is opened. A stepping motor comprising a flange attached to a front portion of the case, the stepping motor having a stepped portion formed by cutting out an inner portion of a front end opening edge portion of the case to be attached to the front end opening edge portion of the case. A bent portion is formed at a peripheral portion of the flange, the bent portion is fitted to a stepped portion of the case, and a rotor shaft is provided in a constant space between the stator and the stator formed by the bent portion of the flange. A stepping motor characterized in that a gear shaft for meshing with a gear axially attached to the shaft is fixed by means such as caulking.