JPH08205470A - Geared motor - Google Patents

Abstract

PURPOSE: To drive a load at a speed different from the rotational speed of the rotor by bearing the rotor and the gear, at one ends thereof, on a coil bobbin and rotatably, at the other ends thereof, on the bearing parts for rotor and gear provided on a cover respectively. CONSTITUTION: The rotor D comprises a central shaft, i.e., a shaft body part 35, a magnet part 36 and a rotor pinion 37 wherein the magnet part 36 is arranged alternately, on the outer circumferential surface thereof, with a plurality of N poles and S poles. When the winding B2 of coil is conducted, magnetic flux is transmitted through the bottom wall 1 of the circumferential wall 2 of the case body A1, the yoke part 28 of a pole body C, etc., to poles 3, 29 which are thereby magnetized and interact magnetically with the pole at the magnet part 36 to rotate the rotor D. The rotation is transmitted from the rotor pinion 37 to the first gear 41a thence through a plurality of gears 41 to the output shaft 47 which is thereby rotated at a speed lower than the rotational speed of the rotor D. With such arrangement, the load can be driven at a speed different from the rotational speed of the rotor D.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a geared motor in which when a rotor is rotated by energizing a coil, the rotation is converted by a gear to extract the rotation.

[0002]

2. Description of the Related Art A case body having a concave shape for accommodating a coil, a rotor and a gear and a lid for closing an opening of the case body are provided, and a bobbin and a winding attached to the bobbin are provided in the case body. A coil configured to generate a magnetic flux for rotating the rotor by energizing the winding, a rotor provided with a rotor pinion for rotating power transmission, and a rotor that meshes with the rotor pinion to rotate. And a gear for converting the moving speed. One end of the rotor is rotatably supported by the case body. One end of the gear is rotatably supported by a magnetic pole substrate provided in the case body. The other ends of the rotor and the gear are rotatably supported by the lid (see, for example, Japanese Utility Model Publication No. 2-18676).

In such a geared motor, when the rotor is rotated by energizing the coil, the load can be driven at a speed different from the rotation speed of the rotor by speed conversion by the gear. Moreover, even if the gear is provided, one end of the gear is supported by the base plate for the magnetic poles, that is, since the member for other purposes is also used as the support, the number of the members is as much as that of the geared motor. It has the advantages of less cost and lower cost.

[0004]

In this conventional geared motor, when the substrate for magnetic poles is assembled to the case body during assembly, if the substrate is laterally displaced with respect to the case body, the rotor and the gear are separated from each other. There is a problem in that the distance between the axes deviates from the planned value, resulting in a poor meshing between the rotor pinion and the gear, resulting in noise during operation.

The geared motor of the present invention is provided to solve the above-mentioned problems (technical problems) of the prior art. A first object of the present invention is to provide a geared motor capable of driving a load at a speed different from the rotation speed of the rotor by changing the rotation speed by gears when the rotor is rotated by energizing the coil. It is to be. Second
The purpose of is to provide a structure for supporting the gear because it is equipped with the above gear, but by using the bobbin of the coil for that purpose also, the number of members as a geared motor can be reduced. Therefore, it is possible to keep the costs associated therewith low. The third purpose is
Even if the coil, which is also used to reduce the number of members, is laterally displaced with respect to the case body when incorporated into the case body, the gap between the axes of the rotor and the gears is fixed at a predetermined value. The dimensions are such that the rotor pinion and the gear can be brought into a predetermined meshing condition for silent operation. Other objects and advantages will be readily apparent from the drawings and the following description related thereto.

[0006]

In order to achieve the above object, a geared motor according to the present invention comprises a case body having a space for accommodating a coil, a rotor and a gear, and a concave case body, and an opening portion thereof. A coil for closing the lid, and a coil which is composed of a bobbin and a winding attached to the bobbin in the case to generate a magnetic flux for rotating the rotor by energizing the winding. In a geared motor provided with a rotor having a rotor and pinion for transmitting rotational power, and a gear for meshing with the rotor and pinion to convert a rotation speed, one end of each of the rotor and the gear is , A rotor bearing portion and a gear bearing portion, which are provided on the bobbin of the coil at a constant distance from each other, are rotatably supported, and the other ends thereof are connected to the lid. It is obtained by rotatably supported by the bearing portion and the gear bearing portion rotor which are provided at regular intervals in.

[0007]

When the coil is energized, a magnetic flux for rotating the rotor is generated and the rotor rotates. Rotation of the rotor is transmitted from the rotor pinion to the gear, and the rotation speed is converted. In the case of assembly, even if the coil is laterally displaced with respect to the case body, the rotor and the gear are supported by the coil bobbin at both ends, so that the mutual spacing is constant. Further, since the other ends are both supported by the lid, the distance between them is constant. Therefore, the axial distance between the rotor and the gear is constant, and they achieve a predetermined meshing state.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 to 3, A is a case, and the inside is a space for accommodating various elements of a geared motor, such as a coil, a magnetic pole body, a rotor, and a gear train. The case A is composed of a concave case body A1 and a lid A2 for closing the opening of the case body A1. B is a coil for generating a magnetic flux for rotating the rotor, C is a magnetic pole body for exerting a magnetic flux for rotating the rotor, D is a rotor, and E is a gear train for speed-converting and extracting the rotational speed of the rotor. Are shown respectively.

First, the case body A1 will be described. The main body A1 is made of a hard material of a magnetic material, such as a steel plate, in order to have sufficient rigidity for protection of the contents and also to function as a magnetic path, and is composed of a bottom wall 1 and a peripheral wall 2. are doing. Reference numeral 3 denotes a magnetic pole for exerting a rotating magnetic flux on the rotor, which is formed by cutting and raising a part of the bottom wall 1. 4 is a through hole for positioning the coil B with respect to the case body A1, 5 is a through hole for preventing rotation of the coil B with respect to the case body A1,
Reference numeral 6 denotes a notch portion for exposing the terminal portion of the coil B.

Next, the lid A2 will be described. The lid A2 is formed by molding a synthetic resin material in order to integrally form and include the respective components described below. 8 is a rotor bearing portion for supporting the rotor D, and 9a and 9 are gear bearing portions for supporting each gear of the gear train, which do not require a conventional long shaft pin for supporting the rotor and gears. All of them are formed in a short protruding shape in order to realize the same. 10 is a bearing for supporting the output shaft. The bearing portion and the bearing are provided at a predetermined fixed distance from each other. Reference numeral 11 denotes a convex portion for preventing the magnetic pole body C and the lid A2 from rotating.

Next, the coil B will be described. The coil B comprises a coil bobbin B1 and a winding B2 attached thereto. Coil bobbin B1 is made of insulating material such as nylon, PB
It is formed by molding a synthetic resin material such as T or polypropylene. The bobbin B1 is a bobbin main body integrally formed with each other.
14 and a bearing body 15. Bobbin main part 14 is the above winding B2
As is well known, it is a part for holding the
It is composed of 17 and 18. Formed integrally on the collar parts 17 and 18.
Reference numerals 19 and 20 denote convex portions for preventing the case body A1 and the coil B and the coil B and the magnetic pole body C from rotating. Reference numerals 21a and 21 are gear bearing portions for supporting the respective gears in the gear train E, and reference numeral 22 is a bearing portion for supporting the output shaft, both of which are provided with a collar portion 17 at a predetermined constant distance from each other. It is formed integrally with. Bearing part
In order to eliminate the need for the conventional long shaft pin for supporting the gears, 21a and 21 are both formed in short projecting pieces as shown in the drawing. Next, the bearing body 15 is for rotatably supporting the rotor D, and comprises a bearing base plate 23 and a rotor bearing portion 25 provided at the center thereof. The bearing portion 25 is the above-mentioned bearing portion.
It is provided at a certain fixed interval from 21a. Further, this is formed in the shape of a short protrusion as shown in the figure in order to eliminate the need for the conventional long shaft pin for supporting the rotor. Reference numeral 24 denotes a bulging portion for positioning the coil B with respect to the case main body A1. The bulging portion 24 is fitted into the through hole 4 to fulfill its purpose. Reference numeral 26 is a terminal portion integrally formed with the collar portion 17, and is provided with a terminal (not shown) for electrical connection. The winding B2 is for rated 100V, for example, and its end is connected to the above terminal.

Next, the magnetic pole body C has a yoke portion 28 for transmitting the magnetic flux generated by the coil B to a plurality of magnetic poles 29,
It is composed of a plurality of magnetic poles 29 for exerting a rotating magnetic flux on the rotor, and a stop piece 33 for stopping the magnetic pole body C on the case body A1. Is formed by. Reference numeral 30 is a through hole for preventing rotation with the coil B, 31a'31 is an escape hole for preventing interference with the bearing portion 21a'21, and 32 is an escape hole for preventing interference with the output bearing portion 22, respectively. Show. The fixing piece 33 has the outer surface 33a pressed against the inner peripheral surface of the case main body A1 to perform the above-mentioned fixing function. The stopper 33 is also a spacer for securing a gear space 34 between the yoke portion 28 and the lid A2, and the space 34 is formed by receiving the lid A2 as shown in FIG.

Next, the rotor D transmits a rotational force to the shaft body portion (also referred to as a boss portion) 35 serving as the central axis of the rotor, the magnet portion 36 provided around the shaft body portion 35, and the gear train E. It is composed of the rotor pinion 37 and. The magnet portion 36 has a plurality of magnetic poles of N and S poles alternately arranged on the outer peripheral surface in the circumferential direction. Reference numerals 38 and 39 denote one end and the other end of the rotor D for receiving the rotatable support by the bearing portion, and an example in which the recess portions are provided so that the bearing portions 25 and 8 can be fitted respectively. . The rotor D is formed as a whole (the shaft body portion 35, by mixing a magnetic powder and a synthetic resin material for binding the magnetic powder and molding the mixture using a mold (known as a technique for manufacturing a plastic magnet). An example in which the magnet portion 36 and the rotor pinion 37) are integrally formed is shown, but each portion may be formed separately from a known material.

Next, the gear train E is exemplified by one composed of a plurality of gears 41a, 41 for reducing the rotation speed. As shown in FIG. 1, the gear 41a includes a shaft portion 42 and a gear portion 43,
An example is shown in which 44 and 44 are integrally formed, for example, by molding a hard synthetic resin material. Reference numerals 45 and 46 denote one end and the other end of the gear 41a for receiving the rotatable support by the bearing portion, and an example in which the recess portions are provided so that the bearing portions 21a and 9a can be fitted respectively. . Although not shown, other gears have the same structure. Reference numeral 47 denotes an output shaft for outputting the turning power toward the load, and shows an example constituted by the shaft body of the final gear of the gear train E.

The assembly of the geared motor having the above structure is as follows. First, the coil B is incorporated into the case body A1. At this time, the bulging portion 24 is fitted into the through hole 4 and the convex portion
Fit 19 into the through hole 5. This determines the positional relationship between the case body A1 and the coil B. Next, the magnetic pole body C is incorporated into the case body A1. At this time, the through hole 30 is fitted to the convex portion 20, and the outer surface 33a of the stopper piece 33 is fitted to the inner peripheral surface of the peripheral wall 2.
Press into contact with 2c. This determines the positional relationship between the coil B and the magnetic pole body C, and in that state, the case body A1
The pole body C is fixed to the bottom wall 1 and the coil B is fixed to the bottom wall 1 and the yoke portion 28.
It is sandwiched between and fixed. Next, rotor D and multiple gears
41a, 41 are assembled and their recesses 38, 45 are fitted into the bearings 25, 21a, 21 for each. Next, rotor D and gears
The bearings 8, 9a, 9 are fitted in the recesses 39, 46 of 41a, 41, the output shaft 47 is fitted in the bearing 10, and the projections 11 are located on both sides of the tip of the stopper 33. In such a state, the lid A2 is fitted to the inner peripheral side of the peripheral edge 2b of the opening in the case body A1,
The peripheral edge A2a is placed on the upper end 33b of the stopper piece 33. Then, the lid A2 is fixed by crimping the peripheral edge 2b of the opening in the case main body A1 to the peripheral edge A2a at a plurality of locations. This completes the geared motor.

In the case of the above-mentioned assembly, the assembling position of the coil B is laterally displaced from the case body A1 or the case body is
Even if the assembling position of the lid A2 is displaced laterally with respect to A1 (both refer to the lateral displacement with respect to the direction of the axis A1 'of the case body A1), the distance between the axis D'of the rotor D and the axis 41a' of the gear 41a. Are substantially predetermined intervals. That is, the rotor D and the gear 41a
The bearings 25 and 21a for supporting one end of the bobbin B1
And the bearings 8 and 9a for respectively supporting the other ends of the rotor D and the gear 41a are provided in the lid A2.
The distance between the bearing portions is a predetermined distance. The coil B is positioned with respect to the case body A1 by fitting the bulging portion 24 and the convex portion 19 into the through holes 4 and 5,
Further, the lid A2 is a peripheral wall of the opening of the peripheral wall 2 in the case body A1.
It is positioned by fitting the inside of 2b and fitting of the convex portion 11 to the stop piece 33 (note that the stop piece 33 has a through hole 30 for the coil B in the above-described positioned state). Have already been positioned by the fitting of the convex portion 20 with the convex portion 20), and the amount of their lateral displacement is small. Therefore, the axis D'of the rotor D and the gear 41
The distance between the axes 41a 'of a is substantially a predetermined distance.

Next, the operation of the geared motor will be described. When the coil winding B2 is energized, the magnetic flux generated thereby is transmitted through the portion of the peripheral wall 2 of the case body A1 indicated by the reference numeral 2a, the bottom wall 1, the yoke portion 28 of the magnetic pole body C, etc. as a magnetic path and the magnetic pole 3 , 29, and they are magnetized respectively. As a result, the rotor D is rotated by the known magnetic action of the magnetic poles of the magnet portion 36 and the magnetized magnetic poles 3 and 29 of the rotor D. Rotation of the rotor D is performed by the rotor pinion 37.
From the first gear 41a to the first gear 41a, and further transmitted through another plurality of gears 41 to be decelerated and transmitted to the output shaft 47, and the output shaft 47 rotates at a speed lower than the rotation speed of the rotor D.

The concave and convex relations between the one end and the other end of the rotor and the gear and the bearing portion that rotatably supports the rotor and the gear are relative, and one end and the other end of the rotor and the gear are convex. If formed, the bearing portion for each may be formed as a recess.

[0019]

As described above, according to the present invention, when the rotor D is rotated by energizing the coil B, the rotation speed is converted by the gear 41a to rotate the load of the rotor D. It has the feature that it can be driven at a speed different from the speed. Moreover, even if such a gear 41a is provided, as for the support of the gear 41a, the other purpose member such as the bobbin B1 of the coil B is also used for the support, so the number of members as a geared motor is increased. Is reduced by that amount, and there is an effect that costs associated therewith can be kept low. Moreover, even when the bobbin B1 of the coil B is also used for supporting the gear 41a as described above, when assembling the geared motor, the coil body B is mounted on the case body A1 when the coil B is assembled into the case body A1. On the other hand, even if the coil B is laterally offset, both ends of the rotor D and the gear 41a are supported by the bobbin B1 of the coil B, so that the dimension between these ends is a predetermined dimension. Further, since the other ends of the rotor D and the gear 41a are both supported by the lid A2, the dimension between the other ends of them is also a predetermined dimension. Therefore, the distance between the axes of the rotor D and the gear 41a is set. Has the characteristic that it has a predetermined size. This has an effect that the rotor pinion 37 and the gear 41a can achieve a predetermined meshing state and can perform a quiet operation.

[Brief description of drawings]

FIG. 1 is a vertical sectional view.

FIG. 2 is a view showing an internal structure with a lid removed.

FIG. 3 is an exploded perspective view.

[Explanation of symbols]

 A1 Case body A2 Lid B Coil D Rotor 41a Gear

Claims (1)

[Claims] 1. A case having a space for accommodating a coil, a rotor and a gear is composed of a concave case main body and a lid for closing an opening thereof, and in the case,
A coil including a bobbin and a winding attached to the coil to generate a magnetic flux for rotating the rotor by energizing the winding, a rotor including a rotor pinion for transmitting rotational power, and the rotor In a geared motor including a pinion and a gear for converting a rotational speed, the rotor and the one end of the gear are provided on the bobbin of the coil at regular intervals. The bearings for gears and the bearings for gears are rotatably supported, and the other ends of the bearings are rotated by the bearings for rotors and the bearings for gears, which are provided on the lid at regular intervals. A geared motor characterized by being movably supported.