JP2012235549A - Geared motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a geared motor which inhibits rumbling due to a clearance between a rotation shaft and a bearing part and is assembled without deforming the bearing part.SOLUTION: Cut-out parts 25a and 25b are provided at second facing surfaces 22a and 22b of a motor case 20. At least one of third facing surfaces 23a and 23b is opened, and bearing housings 30a and 30b are attached to the cut-out parts 25a and 25b. A warm wheel 4 engages with a warm gear 3 at the side where the cut-out part 25a of the output side second facing surface 22a opens.

Description

  The present invention relates to a geared motor, and more particularly to a technique for reducing noise and vibration caused by a clearance between a rotating shaft of a motor and a bearing.

  In general, since a motor rotatably supports a rotary shaft within a bearing, a slight clearance is secured between the bearing and the rotary shaft. Therefore, when the rotor rotates, the rotor and the rotating shaft vibrate in a direction perpendicular to the axial direction (radial direction), and a large noise (so-called goro noise) may be generated.

In order to suppress the rolling noise caused by the bearing clearance, it is considered to press the rotating shaft in the radial direction.
For example, in Patent Document 1, as shown in FIG. 14, in a geared motor including a motor 101 having a worm gear 103 mounted on the output side of a rotating shaft 102 and a worm wheel 104 meshing with the worm gear 103, It describes that the front end of the output side is abutted against the spring plate 105 and a lateral pressure in a direction away from the worm wheel 104 is applied to the rotating shaft 102.

  In particular, in the case of a small motor, the center direction of the pair of bearings may be shifted due to the assembly accuracy of the member that fixes the pair of bearings that support the rotating shaft, the press-fit accuracy of the bearings, and the like. If the center direction of the pair of bearings is deviated, there is a variation in the clearance between the bearing and the rotary shaft, and products having excessive sliding loss are likely to be mixed, which tends to cause a decrease in yield.

  In order to solve such a problem, for example, in Patent Document 2, as shown in FIG. 15, a bearing 113 attached to one end surface 112 of the motor case 111 and an opening opposite to the one end surface 112 are provided. In a small motor in which the rotating shaft 116 is inserted into the bearing 115 attached to the lid 117 that closes the cover 115, the bearing holder 110 formed by press-fitting the bearing 115 is fitted into the hole 117a of the lid 117. A slip resistant and rotatable structure is disclosed.

Japanese Patent No. 3479139 JP 2005-117770 A

Although the geared motor of FIG. 14 can suppress the grooving noise to some extent, since it has a structure in which a pair of bearings are fixed to the case of the motor 101 or the like, excessive sliding is caused by a shift in the center direction of the pair of bearings. When dynamic loss has occurred, there is a problem that it is not possible to suppress a golo sound caused by this.
In the geared motor shown in FIG. 14, the worm gear 103 needs to be attached to the output side of the rotary shaft 102 by press-fitting or the like in a state where the whole is covered with a metal case or the like and completed as the motor 101. In particular, there is a problem that an excessive load is applied to the bearing portion in the thrust direction and the bearing portion is likely to be deformed.

On the other hand, in the motor as shown in FIG. 15, by rotating the bearing holder 110 in the hole 117a, the deviation in the center direction of the pair of bearings can be corrected to some extent. It can be, but not enough.
Further, when the motor as shown in FIG. 15 is used as a geared motor (geared actuator), since it is necessary to attach a worm gear to the output side of the rotating shaft 116 by press-fitting or the like in a state where the motor is completed, deformation of the bearing portion is caused. There is a problem that easily occurs.

  Therefore, in view of the above-described problems of the prior art, the present invention provides a geared motor that can be assembled without suppressing the rolling noise caused by the clearance between the rotating shaft and the bearing and without causing deformation of the bearing portion. Objective.

The geared motor of the present invention includes a motor (10) in which a rotating shaft (61) supported by two bearings (40a, 40b) is protruded to an output side in a housing, and an output side of the rotating shaft (61). In a geared motor comprising a worm gear (3) attached to a worm wheel (4) meshing with the worm gear (3),
The motor (10) includes a motor case (20) formed into a rectangular cylindrical shape by bending a steel plate, a stator magnet (50a, 50b), and a rotor (60) formed integrally with the rotating shaft (61). Have
The motor case (20) includes two first opposing surfaces (21a, 21b) that face each other, two second opposing surfaces (22a, 22b) that face each other, and two third opposing surfaces that face each other ( 23a, 23b)
The stator magnets (50a, 50b) are arranged inside the two first opposing surfaces (21a, 21b), respectively.
The two second opposing surfaces (22a, 22b) are each provided with a notch (25a, 25b) extending from the center to the third opposing surface (23a, 23b) and opening at the edge. And
At least one of the two third facing surfaces (23a, 23b) is an opening,
Bearing housings (30a, 30b) are respectively attached to the two notches (25a, 25b),
The two bearings (40a, 40b) are respectively fixed in the two bearing housings (30a, 30b),
The worm wheel (4) meshes with the worm gear (3) on the opening side of the notch (25a) provided on the second opposing surface (22a) on the output side.
It is characterized by that.

According to the geared motor of the present invention, when the rotating shaft is tilted by the force acting on the worm gear from the worm wheel, the bearing housing and the bearing can be tilted following the tilt. For this reason, it is possible to prevent excessive force from being applied to only a part of the bearing, effectively reduce the goro noise caused by sliding loss, and adjust the positional relationship between the worm wheel and the worm gear, It is also possible to prevent play between the worm wheel and the worm gear.
Further, according to the geared motor of the present invention, the assembly of the motor is easy and the degree of freedom of the assembly is high, and the worm gear can be press-fitted into the rotating shaft in an arbitrary process before the motor is completed. The geared motor can be assembled without causing any deformation.

It is a top view which shows typically the housing inside of geared motor 1A which concerns on the example of 1st Embodiment of this invention. It is the side view of motor 10A seen from the AA direction in FIG. (A) is sectional drawing of the motor 10A in the BB line in FIG. 1, (b) is sectional drawing of the motor 10A in the CC line in FIG. It is a figure which shows the case 20 of the motor 10A of FIG. 2, (a) is a side view of the same direction as FIG. 2, (b) is a perspective view. It is sectional drawing which shows the bearing and bearing housing of 10 A of motors of FIG. It is a perspective view which shows the stator magnet of the motor 10A of FIG. It is a side view for demonstrating the assembly method of the motor 10A in the geared motor 1A which concerns on the example of 1st Embodiment of this invention. It is a top view for demonstrating the assembly method of the motor 10A in the geared motor 1A which concerns on the example of 1st Embodiment of this invention. It is a top view which shows typically the housing inside of the geared motor 1B which concerns on the example of 2nd Embodiment of this invention. It is the side view of the motor 10B seen from the EE direction in FIG. It is a perspective view which shows case 20 of the motor 10B of FIG. It is sectional drawing which shows another example of the bearing housing which can be used for the geared motor of this invention. It is a top view which shows typically the housing inside of the geared motor using the bearing housing of FIG. It is a figure which shows typically the inside of the geared motor of a prior art example. It is sectional drawing which shows the small motor of a prior art example.

    Embodiments of the present invention will be described below with reference to the accompanying drawings.

(First embodiment)
FIG. 1 is a plan view showing the inside of a housing of a geared motor 1A according to this embodiment.
As shown in FIG. 1, a geared motor 1A includes a motor 10A, a worm gear 3, a worm wheel 4, intermediate gears 5 and 6 in a housing formed in a substantially rectangular parallelepiped box shape by a lower case 2 and an upper case (not shown). The output gear 7 is accommodated.
Although not shown in FIG. 1, a circuit board is accommodated in the housing, and a circuit for detecting the rotation of the motor drive circuit and the output gear 7 is provided on the circuit board.

  The geared motor 1A of this example is provided with, for example, a link mechanism for operating a wiper arm of a vehicle, a flow path control valve, and the like on an operation shaft 7a integrated with the output gear 7, thereby driving the wiper arm and the air conditioning device. A flow path control valve or the like can be driven.

2 is a side view of the motor 10A as viewed from the direction AA in FIG. 1, FIG. 3A is a cross-sectional view of the motor 10A along the line BB in FIG. 1, and FIG. It is sectional drawing of the motor 10A in the CC line.
As shown in FIGS. 2 and 3, the motor 10 </ b> A includes a motor case 20, bearing housings 30 a and 30 b, bearings 40 a and 40 b, a stator magnet 50 (50 a and 50 b), and a rotor 60.

The motor case 20 is formed into a rectangular cylindrical shape as shown in FIG. 4 by bending a steel plate.
The motor case 20 has two first facing surfaces 21a and 21b facing each other, two second facing surfaces 22a and 22b facing each other, and two third facing surfaces 23a and 23b facing each other. The first facing surface, the second facing surface, and the third facing surface are orthogonal to each other, and the third facing surfaces 23a and 23b are both openings in this example.
One end portion of the first facing surface 21a is bent toward the second facing surface 22a to form a reinforcing portion 24, and the reinforcing portion 24 is fixed to the second facing surface 22a by bonding or the like. Stiffness can be increased.

The two second facing surfaces 22a and 22b are provided with cutout portions 25a and 25b that extend from the center portion to the third facing surface side and open at the edges.
The notches 25a and 25b are wide on the edge side, narrow on the center side (opposite to the edge), and end portions 26a and 26b on the center side are semicircular.
In this example, the two notches 25a and 25b are open in opposite directions. Specifically, the notch 25a of the second facing surface 22a located on the output side is open to the side where the worm wheel 4 is disposed, and the notch 25b of the second facing surface 22b located on the counter-output side. Is open on the side opposite to the side on which the worm wheel 4 is arranged.

A bearing housing 30a is mounted on the center side of the notch 25a of the second facing surface 22a located on the output side. A bearing housing 30b is mounted on the center side of the cutout portion 25b of the second facing surface 22b located on the counter-output side.
As shown in FIG. 5A, the output-side bearing housing 30a has a cylindrical shape penetrating in the axial direction, and a bearing 40a made of a sintered oil-impregnated bearing is fixed therein by press-fitting.
As shown in FIG. 5B, the bearing housing 30b on the non-output side has a bottomed cylindrical shape having a thrust receiving portion 32 at the bottom, and a bearing 40b made of a sintered oil-impregnated bearing is fixed therein by press-fitting. ing.

The bearing housings 30a and 30b are made of an elastic body such as a resin material or rubber or a thermoplastic elastomer, and have constricted portions 31a and 31b with small outer diameters in the central portion in the axial direction, and the constricted portions 31a and 31b have an axial direction. The adjacent portions are formed in a predetermined curved surface shape.
The outer diameter W of the constricted portions 31a and 31b is substantially the same as the height H of the notches 25a and 25b shown in FIG. Further, the axial height dimension H <b> 1 of the constricted portions 31 a and 31 b is substantially the same as the plate thickness of the steel plate constituting the motor case 20.

  The bearing housings 30a and 30b having the above shapes and dimensions are inserted from the edge side of the cutout portions 25a and 25b via the constricted portions 31a and 31b, and the constricted portions 31a and 31b are inserted into the semicircular central portion side 26a, 26b can be attached to the motor case 20 so as to abut against it. In this mounted state, the bearing housings 30a and 30b can be tilted within a predetermined angle range toward the third facing surfaces 23a and 23b in the notches 25a and 25b, and may be slightly tilted in any direction. It is possible.

The stator magnet 50 is divided into two magnets 50a and 50b, arranged on the inner sides of the first opposing surfaces 21a and 21b of the motor case 20, and fixed by bonding or the like.
As shown in FIG. 6, the magnets 50 a and 50 b include planar back surface portions 51 a and 51 b disposed on the first facing surfaces 21 a and 21 b side, flat surface portions 52 a and 52 b disposed on the rotor 40 side, and a curved surface, respectively. It has the surface parts 53a and 53b. The flat portions 52a and 52b are thinner than the curved surface portions 53a and 53b.
The surfaces of the magnets 50a and 50b facing the rotor 60 are magnetized with different poles.

The rotor 60 is disposed inside the stator magnet 50 with a predetermined gap.
The rotor 60 includes a rotating shaft 61, an armature core 62 formed by stacking a plurality of thin steel plates attached to the rotating shaft 61, a copper wire 63 wound around the armature core 62 in a coil shape, and a copper wire A commutator 64 electrically connected to 63 is provided. The armature core 62 of this example has three salient poles as shown in FIG.
It should be noted that two brushes (not shown) are provided on the second facing surface 22b of the motor case 20 so as to flow in contact with the commutator 64. Also, terminals (not shown) electrically connected to the brushes are attached to the second facing surface 22b and led out of the motor case 20.

  The rotating shaft 61 is rotatably supported by bearings 40a and 40b. The output side of the rotary shaft 61 protrudes outside the motor case 20, and the worm gear 3 is mounted on the output side of the rotary shaft 61 by press-fitting or the like.

The worm gear 3 is connected to a reduction gear including a worm wheel 4, intermediate gears 5 and 6, and an output gear 7.
The worm wheel 4 meshes with the worm gear 3 on the side where the notch 25a provided in the second opposing surface 22a on the output side opens.

  With the above configuration, the rotational force of the rotating shaft 61 of the motor 10A is transmitted to the operating shaft 7a via the worm gear 3, the worm wheel 4, the intermediate gears 5, 6, and the output gear 7, and the wiper arm is transmitted via the operating shaft 7a. And the flow path control valve of the air conditioner can be driven.

Next, an example of a method for assembling the geared motor 1A of this example will be described with reference to FIGS. 7 is a side view seen from the same direction as FIG. 2, and FIG. 8 is a view seen from the DD direction in FIG.
First, the rotor 60 is assembled integrally with the rotating shaft 61 (see FIG. 7A).
Next, the output side of the rotating shaft 61 is inserted through the bearing 40a fixed in the bearing housing 30a (see FIG. 7B).
Next, the worm gear 3 is attached to the output side of the rotating shaft 61 by press fitting (see FIG. 7C).
Next, the non-output side of the rotating shaft 61 is inserted into the bearing 40b fixed in the bearing housing 30b (see FIG. 7D).

Next, the bearing housing 30a is attached to the notch 25a of the second opposing surface 22a of the motor case 20, and the bearing housing 30b is attached to the notch 25b of the second opposing surface 22b. (See FIG. 7E).
Specifically, after the rotor 60 is inserted into the motor case using the third facing surfaces 23a and 23b that are the openings of the motor case 20, the bearing housings 30a and 30b are inserted into the notches 25a and 25b. Insert the bearing housings 30a and 30b all the way into the notches 25a and 25b (see FIG. 8B), and connect the constricted portions 31a and 31b to the central portion side (see FIG. 8A). It is made to contact | abut to edge part 26a, 26b.

Next, as shown in FIG. 2, the magnets 50a and 50b are fixed inside the first facing surfaces 21a and 21b of the motor case 20 to complete the motor 10A.
Specifically, since the third opposing surfaces 23a and 23b of the motor case 20 are openings, the magnet 50a is inserted into the motor case from the third opposing surface 23b on the back side of the paper surface of FIG. It fixes to the inner side of the opposing surface 21a. Further, the magnet 50b is inserted into the motor case from the third facing surface 23a on the front side in FIG. 2 and is fixed inside the first facing surface 21b. Accordingly, the magnets 50a and 50b are disposed to face the rotor 60 with a predetermined gap.

Finally, as shown in FIG. 1, the motor 10 </ b> A is attached to the lower case 2 so that the worm wheel 4 and the worm gear 3 are engaged with each other on the opening side of the cutout portion 25 a provided on the output-side second facing surface 22 a. After fixing, the upper case (not shown) is fitted to the lower case 2 to complete the geared motor 1A.
In the geared motor 1A of the present example, as shown in FIG. 1, the wall portion 8 is integrally formed with the lower case 2 constituting a part of the housing, and the motor 10A is fixed to the lower case 2 The third facing surfaces 23a and 23b of the motor case 20 serving as openings are closed by the wall 8 and the peripheral wall 2a of the lower case 2, respectively.

As described above, in the geared motor 1A of the present example, the notch 25a that extends from the center to the third facing surfaces 23a and 23b and opens at the edge on the second facing surfaces 22a and 22b of the motor case 20. , 25b are provided. The bearing housings 30a and 30b are attached to the notches 25a and 25b so that the worm wheel 4 and the worm gear 3 mesh with each other on the opening side of the notch 25a provided on the second opposing surface 22a on the output side. It has become.
For this reason, the bearing housings 30a and 30b can be tilted within a predetermined angle range toward the third facing surfaces 23a and 23b in the notches 25a and 25b.
Thereby, when the upward force of FIG. 1 acts on the worm gear 3 from the worm wheel 4, the bearing housings 30a, 30b and the bearings 40a, 40b are inclined following the inclination of the rotary shaft 61, and the bearing It is possible to prevent excessive force from being applied to only a part, and to effectively reduce the goro noise caused by sliding loss, and the meshing position between the worm wheel 4 and the worm gear 3 is adjusted, and the worm wheel 4 is adjusted. And play between the worm gear 3 can be prevented.

Further, in the geared motor 1A of the present example, since the portions adjacent to the constricted portions 31a and 31b of the bearing housings 30a and 30b in the rotation axis direction are formed in a curved surface shape, the bearing housings 30a and 30b include the notches 25a and 30b. It can be slightly tilted in any direction within 25b.
Thereby, the shift | offset | difference of the center direction of a pair of bearing can be corrected, and the goro sound resulting from a sliding loss can be reduced much more effectively.

Further, in the geared motor 1A of this example, notches 25a and 25b extending from the center to the third facing surfaces 23a and 23b and opening at the edges are formed on the second facing surfaces 22a and 22b of the motor case 20. The third opposing surfaces 23a and 23b are openings.
For this reason, the assembly of the motor 10A is easy and the degree of freedom in assembly is high, and the worm gear 3 can be press-fitted to the output side of the rotating shaft 61 in an arbitrary process before the motor 10A is completed.
Therefore, for example, as shown in FIG. 7C, the worm gear 3 can be press-fitted into the rotary shaft 61 before the bearing housing 30b having the thrust receiving portion 32 is assembled, and the motor is not deformed. 10A and the geared motor 1A can be assembled.

In the geared motor 1A of this example, the two magnets 50a and 50b constituting the stator magnet 50 have thin flat surface portions 52a and 52b and thick curved surface portions 53a and 53b.
For this reason, with the rotor 60 disposed inside the motor case 20, the magnets 50 a and 50 b are inserted into the motor case 20 from the thin flat portions 52 a and 52 b, and the magnets 50 a and 50 b are fixed to the motor case 20. Can do. Further, by having the thick curved surface portions 53a and 53b, the gap between the curved surface portions 53a and 53b and the rotor 60 can be set narrow, and a decrease in driving torque can be suppressed.

  Further, in the geared motor 1A of this example, the motor case 20 is formed in a rectangular cylindrical shape by bending a steel plate, and the third opposing surfaces 23a and 23b are openings, so that the motor can be reduced in weight. And since this opening part is obstruct | occluded by the wall part 8 and the surrounding wall 2a of a housing, the penetration | invasion of the abrasion powder etc. of the brush to the area | region of a reduction gear can be prevented.

(Second Embodiment)
A geared motor according to a second embodiment of the present invention will be described with reference to FIGS. 9 is a plan view schematically showing the inside of the housing of the geared motor 1B according to the present embodiment, FIG. 10 is a side view of the motor 10B viewed from the EE direction in FIG. 9, and FIG. 11 is a case of the motor 10B. FIG.
9 to 11, the same reference numerals as those in FIGS. 1 to 8 denote equivalent members, and detailed description thereof is omitted.

In the present embodiment example, the following two points are greatly different from the first embodiment example.
First, in the first embodiment, the two notches 25a and 25b open in opposite directions, but in the present embodiment, the two notches 25a and 25b open in the same direction.
Secondly, in the present embodiment, a side pressure applying member (plate spring) 70 that applies a side pressure from the opening side of the notch portion 25b to the center side is provided for the bearing housing 30b on the opposite output side.

As shown in FIG. 11, the motor case 20 of this example is provided with notches 25a and 25b extending from the center to the third opposing surface 23a side and opening at the edges on the two second opposing surfaces 22a and 22b. It has been.
The notches 25a and 25b are open on the side where the worm wheel 4 is disposed, and have the same height dimension H from the edge side to the center side, and the end portions 26a and 26b on the center side are It is semicircular.

  Thus, by opening the two notches 25a and 25b in the same direction, when assembling from the state of FIG. 7 (d) to the state of FIG. 7 (e), a complicated assembly as shown in FIG. 8 is performed. The rotor 60 can be easily arranged inside the motor case 20 without performing this.

Also in the geared motor 1B of this example, the bearing housings 30a and 30b can be tilted within a predetermined angle range toward the third opposing surfaces 23a and 23b in the notches 25a and 25b.
Accordingly, when an upward force in FIG. 9 acts on the worm gear 3 from the worm wheel 4, the bearing housings 30a and 30b and the bearings 40a and 40b are inclined in accordance with the inclination of the rotary shaft 61. It is possible to prevent an excessive force from being applied to only a part, and to effectively reduce the rough sound caused by the sliding loss.
However, in this example, the cutout portion 25b of the second facing surface 22b located on the counter-output side is also open on the side where the worm wheel 4 is disposed, so that the upward force in FIG. 9 is applied from the worm wheel 4 to the worm gear 3. If this occurs, there is a risk that the bearing housing 30b on the non-output side moves to the opening side.
For this reason, in this example, the bearing housing 30b is moved by providing a side pressure applying member (plate spring) 70 that applies a side pressure from the opening side of the notch 25b to the center side of the bearing housing 30b on the counter-output side. I try to limit it.

  Also in the geared motor 1B of this example, as in the first embodiment, the motor 10B is easy to assemble, and the degree of freedom of assembly is high, and the output of the rotary shaft 61 in an arbitrary process before the motor 10B is completed. The worm gear 3 can be press-fitted to the side, and the motor 10B and the geared motor 1B can be assembled without causing deformation of the bearing portion.

  Also in the geared motor 1B of this example, the magnets 50a and 50b can be inserted and fixed to the motor case 20 with the rotor 60 disposed inside the motor case 20 as in the first embodiment. At the same time, a decrease in driving torque can be suppressed.

  Also in the geared motor 1B of this example, the motor can be reduced in weight as in the first embodiment, and the openings of the third facing surfaces 23a and 23b are closed by the housing wall 8 and the peripheral wall 2a. Thus, it is possible to prevent the brush wear powder and the like from entering the reduction gear region.

As mentioned above, although two example embodiments of the present invention have been described, the present invention is not limited to these example embodiments, and appropriate changes, addition of parts, etc. are possible without departing from the gist of the present invention. Needless to say, you can.
For example, in the above embodiment, the two third facing surfaces 23a and 23b of the motor case 20 are both openings, but in the case of the motor case as shown in FIG. 11, the third on the side where the rotor 60 is inserted. Only the facing surface 23a can be an opening.
Further, the bearing housings 30a and 30b may be configured as shown in FIG. 5 as long as the bearing housings 30a and 30b can be inclined to the third facing surfaces 23a and 23b to some extent within the cutout portions 25a and 25b of the second facing surfaces 22a and 22b. Not limited to this, any form can be adopted.
In particular, as the bearing housing 30b on the counter-output side, for example, as shown in FIG. 12, a configuration in which a flange 33 is provided in an intermediate portion in the axial direction of a bottomed cylinder can be used. The bearing housing 30b of FIG. 12 can be assembled from the outside of the motor case 20 so that the flange portion 33 is brought into close contact with the outer surface of the second facing surface 22b, so that it can be assembled in the last step of assembling the motor. . When the bearing housing 30b shown in FIG. 12 is used, as shown in FIG. 13, a lateral pressure can be applied to the bearing housing 30b by the rising rib (side pressure applying member) 71 formed integrally with the lower case 2. it can.
The side pressure applying member is not limited to the above-described structure, and any structure can be applied as long as it can apply a predetermined side pressure to the bearing housing 30b on the counter-output side.

1A, 1B Geared motor 2 Lower case 2a Lower case peripheral wall 3 Worm gear 4 Worm wheel 5, 6 Intermediate gear 7 Output gear 7a Operation shaft 8 Wall 10A, 10B Motor 20 Motor case 21a, 21b First facing surface 22a, 22b First Two opposing surfaces 23a, 23b Third opposing surface 24 Reinforcement portions 25a, 25b Notch portions 26a, 26b End portions 30a, 30b on the center side Bearing housings 31a, 31b Constricted portions 32 Thrust receiving portions 33 Gutter portions 40a, 40b Bearings 50a, 50b Stator magnet 51a, 51b Back surface part 52a, 52b Plane part 53a, 53b Curved surface part 60 Rotor 61 Rotating shaft 62 Armature core 63 Copper wire 64 Commutator 70 Leaf spring (side pressure applying member)
71 Rising rib (side pressure applying member)
DESCRIPTION OF SYMBOLS 101 Motor 102 Rotating shaft 103 Worm gear 104 Worm wheel 105 Spring plate 110 Bearing holder 111 Motor case 113, 115 Bearing 116 Rotating shaft 117 Lid

Claims (6)

In a geared motor, comprising: a motor in which a rotating shaft supported by two bearings is protruded to an output side in a housing; a worm gear mounted on the output side of the rotating shaft; and a worm wheel meshing with the worm gear;
The motor has a motor case formed into a rectangular cylindrical shape by bending a steel plate, a stator magnet, and a rotor formed integrally with the rotating shaft,
The motor case has two first facing surfaces facing each other, two second facing surfaces facing each other, and two third facing surfaces facing each other,
The stator magnets are respectively disposed inside the two first opposing surfaces,
The two second opposing surfaces are each provided with a notch that extends from the center to the third opposing surface and opens at the edge,
At least one of the two third facing surfaces is an opening,
A bearing housing is attached to each of the two notches,
The two bearings are respectively fixed in the two bearing housings;
The worm wheel meshes with the worm gear on the opening side of the cutout portion provided on the output-side second facing surface.
A geared motor characterized by that.   2. The geared motor according to claim 1, wherein the notch portions provided on the two second facing surfaces are opened in opposite directions to each other.   2. The geared motor according to claim 1, wherein the notch portions provided in the two second facing surfaces are opened in the same direction.   A side pressure applying member that applies a side pressure from the opening side of the notch portion in which the bearing housing is mounted to the center side with respect to the bearing housing to which the bearing supporting the opposite output side of the rotating shaft is fixed; The geared motor according to claim 3.   The geared motor according to claim 4, wherein the side pressure applying member includes a leaf spring attached to the housing. The geared motor according to any one of claims 1 to 5, wherein the housing is provided with a wall portion that closes the opening.

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