JP2001339903A - Mounting method for motor rotating shaft - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a mounting method for a motor rotating shaft with a small number of processes, easy and requiring less facility cost and capable of preventing thrust rattling. SOLUTION: For the mounting of a geared motor 10, a heat-resistant resin 34 is put on the tip 20A of a worm gear 20 and, in this state, the worm gear 20 is inserted into a shaft hole 28 of a motor housing 18. The heat-resistant resin 34 is thereby pressed by the tip 20A of the worm gear 20 and filled into the shaft hole 28 and, when the resin 34 is hardened in the shaft hole 28, the thrust of the worm gear 20 is regulated with the hardening of the resin. Consequently, the thrust is easily regulated along with the mounting of the geared motor 10, an injection-molding machine is not required and the thrust rattling does not occur, as heat generated at the bearing 22 does not melt out the heat- resistant resin 34.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor rotating system in which a resin loaded into a shaft hole provided in a motor housing supports a thrust load of a motor rotating shaft having one end inserted into the shaft hole. It relates to a method of assembling a shaft.

[0002]

2. Description of the Related Art A rotor (armature) of a motor is housed in a housing, and a rotating shaft (armature shaft) is rotatably supported by the housing.
In this case, as a method of assembling the rotating shaft that supports the thrust load of the rotating shaft in a simple manner, a rubber cushion is arranged at the tip of the rotating shaft, and the rubber cushion is assembled while being pressed by the rotating shaft. There is known a method of supporting a thrust load of a rotating shaft by a rubber cushion elastic force.
This type of assembling method is easy to assemble, but on the other hand, there is a problem that thrust play occurs due to the elastic deformation of the rubber cushion, so that a reverse sound is generated when the motor is reversed.

Therefore, as a method of assembling a rotary shaft for supporting the thrust load while preventing the generation of thrust play, a method of filling a resin such as polyacetal at the tip of the rotary shaft and curing the resin to support the rotary shaft. It has been known. In this type of assembling method, it is possible to absorb variations in dimensional accuracy of individual parts, and to support the rotating shaft in a state corresponding to the thrust force of the rotating shaft by a simple method.

[0004] However, in such a conventional assembling method, an injection molding machine for filling the resin is required because the tip of the rotating shaft is filled with the resin after the rotating shaft is assembled to the motor body. There is high equipment cost,
There was a problem that the number of work steps also increased.

Further, in such a conventional assembling method,
Since a thermoplastic resin is used as the resin to be filled in the tip portion of the rotating shaft, there is a possibility that the resin may melt due to heat generated by the thrust load supporting portion. For this reason, it is necessary to arrange a heat insulating plate between the rotating shaft and the resin, and there is a problem that the number of parts increases and the number of work steps further increases.
Further, even with such a heat insulating plate, it is impossible to prevent the resin from being melted out, and there is a possibility that the state where the thrust load of the rotating shaft is supported cannot be maintained. That is, in some cases, generation of thrust play cannot be prevented.

[0006]

SUMMARY OF THE INVENTION In consideration of the above facts, the present invention has a small number of man-hours when assembling a rotating shaft, and is easy to work.
Another object of the present invention is to provide a method for assembling a motor rotating shaft that has low equipment cost and does not generate thrust play.

[0007]

According to a first aspect of the present invention, there is provided a method of assembling a motor rotating shaft, wherein one end of the motor rotating shaft connected to a rotor and provided with a rotation transmitting portion is connected to a motor housing. A method for assembling a motor rotary shaft, wherein the thrust load of the motor rotary shaft is supported by a resin that is located in the provided shaft hole and solidified in the shaft hole,
The resin material is a heat-resistant resin, and the heat-resistant resin is inserted into the shaft hole before the motor rotation shaft in a state in which the heat-resistant resin can be plastically deformed. The heat-resistant resin is pressed by a shaft to fill the shaft hole.

According to the first aspect of the present invention, when the motor is assembled, the heat-resistant resin in a plastically deformable state is inserted into the shaft hole provided in the motor housing prior to the motor rotating shaft. insert. That is, for example, a state in which the heat-resistant resin is previously mounted on the tip of the motor rotation shaft, or a state in which the heat-resistant resin is inserted in the shaft hole in advance.

In this state, the heat-resistant resin is pressed by the motor rotating shaft while inserting the motor rotating shaft into the shaft hole to fill the shaft hole. The heat-resistant resin is solidified (cured) at a predetermined temperature in the shaft hole.

Thus, the motor shaft is directly or indirectly in contact with the cured heat-resistant resin, and is supported in a state corresponding to the thrust load.

As described above, since the heat-resistant resin is filled into the shaft hole while inserting the motor rotation shaft into the shaft hole, a support structure for thrust load can be easily obtained at the time of assembling the motor rotation shaft, and the motor rotation shaft is provided. The work after assembling the shaft becomes unnecessary. In addition, an injection molding machine for filling the heat-resistant resin into the shaft hole becomes unnecessary.

Furthermore, since the motor rotating shaft is supported by using a heat-resistant resin, there is no possibility that the resin melts due to the heat generated by the supporting portion, and the state in which the thrust load is supported is maintained. Further, a heat insulating plate between the motor rotation shaft and the heat-resistant resin is not required, the number of parts is reduced, and the number of assembling steps is further reduced.

As described above, according to the method for assembling the rotating shaft of the motor according to the first aspect, the number of working steps for assembling the rotating shaft is small, the work is easy, the equipment cost is low, and no thrust rattling occurs.

According to a second aspect of the present invention, there is provided a method of assembling a motor rotating shaft according to the first aspect of the present invention, wherein the motor rotating shaft is provided between the heat-resistant resin and the motor rotating shaft. An intermediate member capable of contacting a shaft is disposed, and the motor rotation shaft is inserted into the shaft hole.

According to a second aspect of the present invention, in the method of assembling the motor rotating shaft, an intermediate member is disposed between the heat-resistant resin in a plastically deformable state and the motor rotating shaft when the motor is assembled. The shaft is inserted into the shaft hole, and the heat-resistant resin is pressed by the motor rotation shaft via the intermediate member to fill the shaft hole.

For this reason, for example, when the motor rotating shaft is inserted into the shaft hole with the heat-resistant resin placed on the tip of the motor rotating shaft via the intermediate member, the intermediate member is mounted on the heat-resistant resin. By forming the heat-resistant resin into a shape suitable for installation, a careful operation for preventing the heat-resistant resin from falling off is not required, and the heat-resistant resin can be easily inserted into the shaft hole. Also, for example, if the intermediate member has a size and shape corresponding to the shaft hole, the heat-resistant resin can be prevented from leaking to the motor rotation shaft side when the heat-resistant resin is pressed and filled in the shaft hole. A careful operation for prevention is not required, and the heat-resistant resin can be easily filled into the shaft hole.

As described above, according to the method for assembling the rotating shaft of the motor according to the second aspect, the number of working steps for assembling the rotating shaft is small, the work is easier, the equipment cost is lower, and no thrust rattling occurs.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is a partially cutaway front view of a geared motor 10 to which a method of assembling a motor rotating shaft according to an embodiment of the present invention is applied. FIG.
2 shows a bearing section 22 of the geared motor 10 in a plan sectional view and a side sectional view.

The geared motor 10 includes a motor section 10A and a gear section 10B connected to the motor section 10A. In the yoke 12 of the motor unit 10A,
One end of the armature shaft 16 of the armature 14 is supported by a bearing (not shown).

The tip of the armature shaft 16 extends into the motor housing 18 of the gear portion 10 B connected to the yoke 12.

On the other hand, in the gear portion 10B, a worm gear 20 as a motor rotation shaft is connected to the armature shaft 16, and a tip portion 20A of the worm gear 20 is provided.
Are supported by the motor housing 18 by the bearing portion 22. The motor housing 18 has a substantially cup shape that accommodates the worm gear 20 and the wheel gear 24 that meshes with the worm gear 20, and the cup-shaped opening is closed by a cover 26. Also, wheel gear 2
A driven system such as a power window regulator or a sunroof is connected to the output shaft 4.

As shown in detail in FIG. 2, a shaft hole 28 is provided in the motor housing 18 of the bearing portion 22 which supports the tip portion 20A of the worm gear 20. Shaft hole 28
Means that the worm gear 2
The large-diameter portion 28A having a circular cross section and the hexagonal cross section 28B are provided along the 0 axis. The hexagonal cross section 28B has an axis perpendicular to the axis, and is communicated with a communication hole 28C that opens on the cup-shaped opening side (upper side in FIG. 2B) of the motor housing 18.

In the bearing portion 22, a radial bearing 30 is disposed in the large diameter portion 28A of the shaft hole 28, and the distal end portion 20A of the worm gear 20 is inserted through the radial bearing 30 to support the radial load of the worm gear 20. It has become so.

Further, the tip 20A of the worm gear 20
, The metal plate 32 is brought into contact with.
The metal plate 32 has a substantially hexagonal cross section so that it can be inserted into the hexagonal cross section 28B.
4 is formed with a concave portion on which the mounting member 4 can be placed.

Thus, in the bearing portion 22, when the geared motor 10 is assembled, the metal plate 32 is inserted into the hexagonal section 28B of the shaft hole 28, and the metal plate 32 communicates with the hexagonal section 28B of the shaft hole 28. The distal end portion 20A of the worm gear 20 is held in contact with and held by the heat-resistant resin 34 filled and cured in the hole 28C, so that the thrust load of the worm gear 20 is supported.

The heat-resistant resin 34 is in a state of being plastically deformable (clay-like) in a cooled state, is a room-temperature-curable resin that cures when left at room temperature, or is in a state of being plastically deformable at room temperature. A thermosetting resin that cures when heat over a certain level is applied can be used.

Next, the operation of the present embodiment will be described with reference to FIGS.

In the geared motor 10 having the above-described configuration, in adjusting the thrust of the worm gear 20 (assembly of the geared motor 10), as shown in FIG. 3, an armature 14 integral with an armature shaft 16 to which the worm gear 20 is connected is used. Assembled in the yoke 12. On the other hand, a radial bearing 30 and the like are mounted on the motor housing 18.

Next, as shown in FIGS. 4A and 4B, a plastically deformable (clay-like) heat-resistant resin 34 is formed into a cylindrical shape which can be inserted into the shaft hole 28. I do.
The heat-resistant resin 34 formed in a cylindrical shape is
The metal plate 32 with the heat-resistant resin 34 placed thereon is placed on the distal end 20 of the worm gear 20.
Place on A. In this state, until the end surface 12A of the yoke 12 and the end surface 18A of the motor housing 18 come into contact with each other,
The worm gear 20 is inserted into the motor housing 18. As a result, the heat-resistant resin 34 is inserted into the shaft hole 28 before the tip portion 20A of the worm gear 20.

The worm gear 20 is connected to the motor housing 18
When inserted into the inside, the heat-resistant resin 34 passes through the radial bearing 30 provided in the large diameter portion 28A of the shaft hole 28 (FIG. 4).
(C) and (D)), and the hexagonal cross section 28 of the shaft hole 28
B comes into contact with the end (states of FIGS. 4E and 4F). When the worm gear 20 is further inserted into the motor housing 18 from this state, the heat-resistant resin 34 is pressed by the distal end portion 20A (the metal plate 32) of the worm gear 20 and is inserted into the hexagonal cross section 28B of the shaft hole 28. It begins to deform and fill.

When the end surface 12A of the yoke 12 contacts the end surface 18A of the motor housing 18, the worm gear 20
Into the motor housing 18 (the worm gear 20
Of the heat-resistant resin 34 by the tip portion 20A). At this time, the metal plate 32 is
And the distal end portion 20A of the worm gear 20 is inserted into the radial bearing 30. On the other hand, the heat-resistant resin 34 is filled in the hexagonal cross section 28B, and a part thereof protrudes from the opening of the communication hole 28C (FIG. 4 (G),
(State of (H)).

Heat resistant resin 3 protruding from communication hole 28C
4 is cut, and the yoke 12 and the motor housing 18 are fixed with fixing screws 27.

When a room-temperature curable resin that cures at room temperature is used as the heat-resistant resin 34, the heat-resistant resin 34 is heat-resistant at a temperature lower than room temperature so that the resin 34 can be plastically deformed at the time of assembly. The work of forming the resin 34 into a cylindrical shape, the work of inserting the worm gear 20 into the motor housing 18 and the like are performed, and then the resin is left at room temperature to cure the heat-resistant resin 34. On the other hand, when a thermosetting resin is used as the heat-resistant resin 34, the operation of forming the heat-resistant resin 34 into a cylindrical shape at room temperature (room temperature), the operation of inserting the worm gear 20 into the motor housing 18, and the like are performed. Bearing portion 2 filled with heat-resistant resin 34 from outside motor housing 18
2 is heated to cure the heat-resistant resin 34.

Further, after the heat resistant resin 34 is cured, the wheel gear 24 is assembled in the motor housing 18, and the opening of the motor housing 18 is closed by the cover 26.

As described above, the worm gear 20 is
The thrust adjustment is easily performed when the geared motor 10 is assembled because the heat-resistant resin 34 placed on the worm gear 20 is pressed and filled into the hexagonal cross-section 28B of the shaft hole 28 while being inserted into the worm gear 20. In addition, the work after assembly becomes unnecessary. Further, an injection molding machine for filling the hexagonal cross section 28B with the heat resistant resin 34 is not required.

Further, since the worm gear 20 is supported by using the heat-resistant resin 34, the resin is not likely to melt due to the heat generated by the support portion, and the thrust-adjusted state is maintained. Accordingly, a heat insulating plate between the tip portion 20A (metal plate 32) of the worm gear 20 and the heat-resistant resin 34 becomes unnecessary, the number of parts is reduced, and the number of assembling steps is further reduced.

Furthermore, since the heat-resistant resin 34 indirectly abuts on the rotating shaft via the metal plate 32, wear of the heat-resistant resin 34 due to rotation of the rotating shaft is prevented. In addition, since the metal plate 32 has a substantially hexagonal cross section and is inserted into the hexagonal cross section 28B, the metal plate 32 is prevented from rotating together with the rotation of the worm gear 20. Further, the metal plate 32 prevents the heat-resistant resin 34 from leaking into the gap between the tip end portion 20A of the worm gear 20 and the shaft hole 28, and requires careful work so that the heat-resistant resin 34 does not leak. And thrust adjustment (assembly of the geared motor 10) is further facilitated.

In this embodiment, the heat-resistant resin 34 is used.
The worm gear 20 is inserted into the motor housing 18 in a state where the worm gear 20 is placed on the tip portion 20A of the worm gear 20. However, the present invention is not limited to this. Alternatively, the worm gear 20 may be inserted into the motor housing 18 in this state, and the hexagonal section 28B may be filled with the heat-resistant resin 34 in this state. In any case, the shape of the heat-resistant resin before being pressed and filled is not limited to a cylindrical shape, and may be, for example, an arbitrary shape such as a rectangular parallelepiped, a triangular pyramid, or an irregular shape. .
Further, in the present embodiment, the heat-resistant resin 34 is used, but the present invention is not limited to this. For example, a heat-resistant resin may be used instead of the heat-resistant resin. In this case, it is desirable to provide a heat insulating plate between the distal end portion 20A of the worm gear 20 and the thermoplastic resin or the like.

In the present embodiment, the metal plate 3
2, the heat-resistant resin 34 is placed on the tip 20A of the worm gear 20. However, the present invention is not limited to this. The method may be a method in which the heat-resistant resin 34 is directly mounted on the worm gear 20 via another member.

Further, the metal plate 32 has a hexagonal cross section, and the metal plate 32 is inserted into the hexagonal cross section 28B of the shaft hole 28 to prevent entrainment. However, the present invention is not limited to this. Alternatively, a method may be adopted in which the cross section of the metal plate is formed in a circular shape, and a concave portion is formed at a position eccentric from the center, and the resin inserted in the concave portion is cured to prevent the resin from rotating together.

Further, in the present embodiment, the shaft hole 28
A communication hole 28C is provided in a direction perpendicular to the direction in which the heat-resistant resin 34 is discharged from the communication hole 28C. However, the present invention is not limited to this. For example, the communication hole may be in the axial direction of the shaft hole. Alternatively, a method may be employed in which the amount of the heat-resistant resin used is controlled so that the heat-resistant resin is not discharged without providing a communication hole.

As described above, in the method of assembling the rotating shaft applied to the geared motor 10 according to the present embodiment, the thrust adjustment is easily performed when assembling the geared motor 10, and the work after assembling is performed. It is unnecessary, the number of working steps is small, the injection molding machine is unnecessary, the equipment cost is low, and the thrust play caused by melting of the resin does not occur.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view of a geared motor to which a method of assembling a motor rotating shaft according to an embodiment of the present invention is applied.

FIG. 2A is a front sectional view showing a configuration of a bearing portion of a geared motor to which a method of assembling a motor rotating shaft according to an embodiment of the present invention is applied, and FIG. 2B is a side sectional view; is there.

FIG. 3 is a partially broken front view showing a state before assembling a geared motor to which a method of assembling a motor rotating shaft according to an embodiment of the present invention is applied.

4A and 4B are diagrams showing a process of assembling a geared motor to which a method of assembling a motor rotating shaft according to an embodiment of the present invention is applied, and FIG. 4A shows a state in which a resin is mounted in a worm gear shape. (B) is the same plan view, (C) is the front view when the worm gear is inserted into the shaft hole, (D) is the same plan view,
(E) is a front view showing a state in which the resin is in contact with the wall surface of the shaft hole,
(F) is the same top view, (G) is the front view which shows the state which resin was filled in the shaft hole, (H) is the same top view.

[Explanation of symbols]

 Reference Signs List 10 geared motor 18 motor housing 20 worm gear (motor rotation shaft) 22 bearing part 28 shaft hole 32 metal plate (intermediate member) 34 heat-resistant resin (resin)

Claims (2)

[Claims] An end of a motor rotating shaft connected to a rotor and provided with a rotation transmitting portion is located in a shaft hole provided in a motor housing, and a resin filled and solidified in the shaft hole is provided. A method of assembling a motor rotating shaft, wherein a thrust load of the motor rotating shaft is supported by the resin material, wherein the resin material is a heat-resistant resin, and the heat-resistant resin is plastically deformable before the motor rotating shaft. Inserting the motor rotating shaft into the shaft hole, and pressing the heat-resistant resin with the motor rotating shaft to fill the shaft hole while inserting the motor rotating shaft into the shaft hole. Method. 2. The method according to claim 1, wherein an intermediate member is provided between the heat-resistant resin and the motor rotation shaft so as to be in contact with the motor rotation shaft, and the motor rotation shaft is inserted into the shaft hole. The method for assembling a motor rotation shaft according to claim 1.