JP2000316254A - Small-sized motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small-sized motor having reliability, wherein deformation and breakdown of a wheel gear are excluded by preventing creeping of the wheel gear to a worm which is to be caused by an elastic restoring force applied from an elastic member, when a load such as a window glass and a sunroof lid is stopped and the rotation of an output shaft is locked. SOLUTION: This small-sized motor consists of a first shaft 15, wherein a worm 15b is formed on an armature shaft 18, a second shaft 16 wherein the outside diameter is uniform, one end portion is combined with the first shaft 15, the other end portion is extended to the axial direction of the first shaft 15, and a part between the one end portion and the other end portion can be twisted elastically, and a pipe member 17 which is arranged outside the second shaft 16 and combined with the other end portion of the second shaft 16 and to which an armature core 19 and a commutator 20 are fixed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small motor used for driving a window glass or a sunroof lid.

[0002]

2. Description of the Related Art As a small motor for driving a window glass or a sunroof lid, there is known a motor in which a worm is provided on a shaft-shaped armature shaft of an armature that rotates when energized, and a wheel gear meshes with the worm. Have been. An elastic member made of rubber is housed in the wheel gear as a damper material, and an output shaft is connected to the elastic member, and the output shaft is connected to a window glass or a sunroof lid. When the armature rotates by being energized, the wheel gear rotates through the worm, and the rotational force of the wheel gear is transmitted to the output shaft through the elastic member, and the output shaft rotates to open the window glass and the sunroof lid. Move to the side or close side.

[0003]

However, in the above-mentioned small motor, when the window glass or the sunroof lid reaches the stroke end, the window glass or the sunroof lid is closed by being pressed toward the vehicle body at the stroke end. After that, the power supply to the armature is cut off. Therefore, even after the rotation of the output shaft is restrained by preventing the movement of the window glass and the sunroof lid, the armature continues to rotate. Then, in a state where the elastic member housed in the wheel gear is elastically deformed, the power supply is cut off and the rotation of the armature is stopped. Therefore, when the window glass or sunroof lid is moved to the fully closed position or the fully opened position and stopped, the restoring force given by the elastically deformed elastic member is applied to the wheel gear,
As a result, the creep load is still applied to the worm, and a so-called biting state occurs. In particular, when the armature shaft having a worm is made of metal and the wheel gear is made of resin, there is a problem that the wheel gear may be deformed or damaged (missing teeth), and this problem is solved. That was an issue.

[0004]

An object of the present invention is to provide a small motor in which a wheel gear is turned to a worm by an elastic restoring force given by an elastic member when a load on a window glass, a sunroof lid or the like is stopped and rotation of an output shaft is restrained. An object of the present invention is to provide a small motor that is reliable by preventing the wheel gear from being deformed or damaged by preventing the wheel gear from being kept creeped.

[0005]

Configuration of the Invention

[0006]

According to a first aspect of the present invention, there is provided a small motor having a first shaft having a worm formed between one end and the other end, and a shaft having a single outer diameter. None, one end is connected to the other end of the first shaft, and the other end is extended in the axial direction of the first shaft and inserted into the second bearing. A second shaft which is open but elastically twistable, and an opening which is arranged outside the second shaft and which is arranged at one end side in a non-contact manner at one end of the second shaft; and An armature shaft having a pipe member formed with a second shaft coupling portion coupled to the other end of the second shaft near the other end, and one end of the first shaft of the armature shaft are inserted. A first shaft rotatably supporting one end of the first shaft; And receiving, the armature shaft 2
The other end of the shaft is inserted, the second bearing rotatably supports the other end of the second shaft, and the opening of the pipe member of the armature shaft or the other end of the first shaft is inserted. An intermediate bearing rotatably supporting an opening of the pipe member or the other end of the first shaft, an armature core fixed on the pipe member of the armature shaft, and fixed on a pipe member near the armature core. The commutator, the armature coil wound around the armature core and electrically connected to the commutator, the brush electrically connectable to the commutator and arranged outside the commutator, The magnet arranged is engaged with the worm of the first shaft provided on the armature shaft. And Irugiya is characterized and the elastic member accommodated in the wheel gear, that it has a configuration in which an output shaft which is coupled to a load while being coupled to the elastic member.

According to a second aspect of the present invention, there is provided a small-sized motor, wherein the first shaft has a worm formed between one end and the other end, and has a shaft shape, and one end has the other end of the first shaft. A second end is coupled to the end and the other end is extended in the axial direction of the first shaft and inserted into the second bearing, and is elastically twistable between one end and the other end. A shaft, an opening disposed outside the second shaft, formed on one end side in non-contact with one end of the second shaft, and the other end of the second shaft on the other end side; An armature shaft provided with a pipe member having a second bearing insertion portion inserted into the second bearing outside the other end of the second shaft coupling portion and the other end of the second shaft, One end of the first shaft of the armature shaft is inserted, A first bearing rotatably supporting one end of the shaft and a second shaft coupling portion of a pipe member of the armature shaft are inserted therethrough, and a second bearing rotatably supports a second bearing insertion portion of the pipe member. And an intermediate bearing through which the opening of the pipe member of the armature shaft or the other end of the first shaft is inserted, and rotatably supports the opening of the pipe member or the other end of the first shaft, and an armature. An armature core fixed on the pipe member of the shaft, a commutator fixed on the pipe member near the armature core, and an armature coil wound on the armature core and electrically connected to the commutator, A brush which can be electrically connected to the commutator and which is arranged outside the commutator, and an armature core A magnet disposed on the outside, a wheel gear meshed with a worm of a first shaft provided on the armature shaft, an elastic member housed in the wheel gear, and an output coupled to the elastic member and coupled to the load It is characterized by having a configuration having a shaft.

According to a third aspect of the present invention, in the small-sized motor, the second shaft is formed integrally with the first shaft.

According to a fourth aspect of the present invention, the pipe member includes a pipe member main body outside the second shaft, and the second shaft connecting portion of the pipe member is larger than the pipe member main body. It is characterized in that it is configured to have a small outer diameter.

[0010] In the small motor according to the fifth aspect of the present invention, the other end of the first shaft is inserted into the intermediate bearing to rotatably support the other end of the first shaft. A first shaft receiving portion and a pipe member receiving portion, wherein the first shaft receiving portion and the pipe member receiving portion are disposed between the first shaft receiving portion and the pipe member receiving portion; A non-contact middle escape portion is integrally formed at the other end of the shaft and the opening of the pipe member.

In a small motor according to a sixth aspect of the present invention, the intermediate bearing is characterized in that the width of the first shaft receiving portion is formed larger than the width of the pipe member receiving portion.

According to a seventh aspect of the present invention, in the small-sized motor, the other end of the first shaft is inserted into the intermediate bearing, and the first shaft rotatably supports the other end of the first shaft. A configuration in which a side bearing and a first shaft side bearing are formed independently of each other, and a pipe member side bearing is provided through which the opening of the pipe member is inserted to rotatably support the opening of the pipe member. It is characterized by doing.

[0013] The small motor according to claim 8 of the present invention is characterized in that the intermediate bearing is configured such that the width of the first shaft-side bearing is formed larger than the width of the pipe member-side bearing.

[0014] In the small motor according to the ninth aspect of the present invention, the intermediate bearing is provided with only a pipe member-side bearing through which the opening of the pipe member is inserted to rotatably support the opening of the pipe member. It is characterized by having a configuration.

[0015]

In the small motor according to the first aspect of the present invention, the second motor is connected between the time when the load moves to the stroke end and the rotation of the output shaft is restrained and the time when the current supply to the brush is cut off. The pipe member in which the second shaft coupling portion is coupled to the other end side of the second shaft whose other end portion is rotatably supported by the bearing is provided via the second shaft coupling portion by the applied rotational force. Thus, a rotational force is applied to the other end of the second shaft, so that the second shaft and the first shaft rotate, the wheel gear rotates, and the elastic member elastically deforms. When the elastic member has been elastically deformed,
The first shaft stops rotating, the second shaft is elastically twisted with respect to the first shaft, and an elastic repulsive force is accumulated on the second shaft. Thereafter, when the rotational force is not applied to the pipe member, the rotational force in the opposite direction is applied to the wheel gear by the elastic restoring force applied from the elastic member, and at the same time, the elastic repulsive force is accumulated by being twisted. A rotational force in the opposite direction is applied to the first shaft from the second shaft. Therefore, the torque generated when the elastic member that has been elastically deformed is restored and the torque of the first shaft that rotates in the opposite direction due to the restoring force of the second shaft are combined, and the wheel gear is quickly returned. Further, since the second shaft has a single outer diameter, the second shaft is easily formed.

In the small motor according to the second aspect of the present invention, the second bearing is used between the time when the load moves to the stroke end and the rotation of the output shaft is restrained and the time when the current to the brush is cut off. The pipe member on which the second bearing insertion portion is rotatably supported applies a rotational force to the second shaft coupling portion near the other end of the second shaft by the applied rotational force. The shaft and the first shaft rotate, the wheel gear rotates, and the elastic member elastically deforms. When the elastic member has been elastically deformed,
The first shaft stops rotating, the second shaft is elastically twisted with respect to the first shaft, and an elastic repulsive force is accumulated on the second shaft. Thereafter, when the rotational force is not applied to the pipe member, the rotational force in the opposite direction is applied to the wheel gear by the elastic restoring force applied from the elastic member, and at the same time, the elastic repulsive force is accumulated by being twisted. A rotational force in the opposite direction is applied to the first shaft from the second shaft. Therefore, the torque generated when the elastic member that has been elastically deformed is restored and the torque of the first shaft that rotates in the opposite direction due to the restoring force of the second shaft are combined, and the wheel gear is quickly returned. Further, since the second shaft has an axial shape, the second shaft is easily formed.

In the small motor according to the third aspect of the present invention, the second shaft is formed without being connected to the first shaft. Therefore, in addition to the effects of claims 1 and 2, the first shaft and the second shaft are not independently manufactured but are simultaneously manufactured in a single step.

According to a fourth aspect of the present invention, the second shaft connecting portion of the pipe member has an outer diameter smaller than that of the pipe member main body. Therefore, in addition to the effects of the first and second aspects, rotational runout is less likely to occur at the other end of the second shaft and the other end of the pipe member.

In the small motor according to the fifth aspect of the present invention, the armature shaft has a pipe member rotatably supported by the pipe member receiving portion of the intermediate bearing and the second bearing, while the first shaft has the intermediate shaft. The bearing is rotatably supported by a first shaft receiving portion and a first bearing which are integrally formed with the pipe member receiving portion via a center relief portion. Therefore, in addition to the effects of the first and second aspects, the bearing for supporting the other end of the first shaft and the bearing for supporting the opening of the pipe member have a single structure, which is necessary for fabrication. Man-hours do not increase.

[0020] In the small motor according to claim 6 of the present invention, the first shaft has a first bearing disposed at one end of the first shaft and an intermediate bearing having a width larger than that of the pipe member receiving portion. And is rotatably supported by the first shaft receiving portion. Therefore, in addition to the function of the fifth aspect, both ends of the first shaft transmitting the rotational force from the worm to the wheel gear are reliably supported by the first bearing and the first shaft receiving portion.

In a small motor according to a seventh aspect of the present invention, in the armature shaft, the pipe member is rotatably supported by the pipe member side bearing and the second bearing, while the first shaft is connected to the first bearing. And the first shaft side bearing rotatably supported. Therefore,
In addition to the effects of claims 1 and 2, the pipe member transmits the rotational force applied from the armature core to the second shaft without deflection at both ends. The first shaft transmits the rotational force applied from the second shaft to the wheel gear without deflection at both ends.

[0022] In the small motor according to claim 8 of the present invention, the first shaft has a first bearing arranged on one end side of the first shaft and a first shaft having a larger width dimension than the pipe member side bearing. And is rotatably supported by the shaft side bearing. Therefore, in addition to the function of claim 7, both ends of the first shaft for transmitting the rotational force from the worm to the wheel gear are reliably supported by the first bearing and the first shaft side bearing.

In the small motor according to the ninth aspect of the present invention, the combined body comprising the first shaft and the second shaft comprises: a first bearing disposed at one end of the first shaft; and a pipe member. Are rotatably supported at two points separated by a second bearing disposed on the other end side of the second member. Therefore,
In addition to the effects of claims 1 and 2, the first shaft and the second shaft
Even if an impact force is applied from the wheel gear to the combined body including the shafts, it is difficult to transmit the impact force to the pipe member.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION

[0025]

1 to 3 show a first embodiment of a small motor according to the present invention, which is used to drive a window glass.

The illustrated small motor 1 mainly includes a motor case 2, a gear case 3, a first magnet 4, a second magnet 5, an armature 6, a first bearing 7, a second bearing 8, and an intermediate bearing 9. , Wheel gear 10, damper 1
1, output shaft 12, first brush 13, second brush 14
The armature 6 includes an armature shaft 18 including a first shaft 15, a second shaft 16, and a pipe member 17, and an armature core 19.
, A commutator 20 and an armature coil 21.

The motor case 2 is open at one end and closed at the other end, and has a first magnet 4 and a second magnet 5 mounted inside. The first and second magnets 4 and 5 have N and S poles magnetized on the inner peripheral sides facing each other, and an armature 6 is disposed inside the first and second magnets 4 and 5. .

Inside the closed side end of the motor case 2,
A second bearing 8 for rotatably supporting the other end of the second shaft 16 provided on the armature shaft 18 of the armature 6 is fixed, and is a flat plate that slides on the other end of the armature shaft 18. The second shaft-side thrust plate 22 is mounted. The motor case 2 has its open end screwed to the gear case 3 with screws 24.

The gear case 3 is arranged on a projecting side of an armature shaft 18 arranged in the motor case 2. In the center of the gear case 3, a round shaft-shaped hole 3a into which the armature shaft 18 is inserted is formed. In the shaft hole 3a, a first bearing 7 is fixed on a side opposite to the motor case 2, and a resin-made thrust plug fixed to one end of a first shaft 15 provided on an armature shaft 18. A first shaft-side thrust plate 26 slidably in contact with 25 is attached. An intermediate bearing 9 is fixed to the other end of the shaft hole 3a on the motor case 2 side.

The first bearing 7 is a plain bearing having a cylindrical appearance. One end of a first shaft 15 provided on an armature shaft 18 is inserted into the first bearing 7.

The second bearing 8 is a plain bearing having a spherical external appearance, and the second bearing 8 includes a second shaft 1.
6 is inserted through the other end.

The intermediate bearing 9 is a slide bearing having a cylindrical appearance, and has a cylindrical main body 9a of the intermediate bearing 9 on an inner peripheral portion of the first shaft 15 provided on the armature shaft 18. Is formed with a first shaft receiving portion 9b. A pipe member receiving portion 9c is formed on the inner peripheral portion of the bearing body 9a on the pipe member 17 side. And, between the first shaft receiving portion 9b and the pipe member receiving portion 9c, a middle relief portion 9d having an inner diameter larger than that of the first shaft receiving portion 9b and the pipe member receiving portion 9c is formed. .

In the intermediate bearing 9, the first shaft receiving portion 9
b, the pipe member receiving portion 9c and the middle relief portion 9d
Since it is integrally formed with the element a, it can be easily formed as a single structure. In the intermediate bearing 9, the width of the first shaft receiving portion 9b is larger than the width of the pipe receiving portion 9c. Therefore, the first shaft 15 is
When transmitting rotational force from b to the wheel gear 10,
One end of the first shaft 15 is supported by the first bearing 7, and the other end of the first shaft 15 has a width larger than that of the pipe member receiving portion 9 c of the intermediate bearing 9. By being supported by the portion 9b, the first shaft 15 receives a large rotational force without giving a large rotational force and gives a large rotational force to the wheel gear 10.

The armature 6 disposed inside the first and second magnets 4 and 5 has an armature shaft 1
8, an armature core 19, a commutator 20, and an armature coil 21 are provided.

The armature shaft 18 includes the first shaft 15, the second shaft 16, and the pipe member 17, as described above.

The first shaft 15 is provided with a first shaft main body 15a having a round bar shape having a length substantially equal to that of the shaft hole 3a formed in the gear case 3.
A worm 15 is provided substantially at the center of the first shaft body 15a.
b is formed. Worm 15b is wheel gear 1
0 is engaged.

At one end of the first shaft body 15a,
A plug hole 15c having a round hole shape is formed, and a thrust plug 25 is fitted into the plug hole 15c.

At the other end of the first shaft body 15a,
A second shaft fitting hole 15d having a round hole shape is formed. The second shaft 1 is inserted into the second fitting hole 15d.
The first shaft-side fixing portion 16b provided in the sixth shaft 6 is connected. At this time, the second shaft fitting hole 15d is formed to penetrate in the axial direction of the first shaft main body 15a,
First shaft-side fixing portion 1 provided on shaft 16
6b is formed as a further extension, and is connected to the penetrating second shaft fitting hole 15d through the second shaft 16, so that one end of the second shaft 16 can be rotated by the first bearing 7. It may be supported.

The first shaft 15 has one end inserted into the first bearing 7 and the other end inserted into the first shaft receiving portion 9 b provided in the intermediate bearing 9. , The first bearing 7 and the intermediate bearing 9 are rotatably supported. At this time, the first shaft 15 is rotatably supported by the first bearing 7 and the first shaft receiving portion 9b having a width larger than the width of the pipe member receiving portion 9c in the intermediate bearing 9. As a result, when transmitting the rotational force to the wheel gear 10, the vibration hardly occurs, and the rotational force is efficiently applied to the wheel gear 10.

The second shaft 16 is connected to the first shaft 1
5 has a length dimension in the same direction as the axial direction and has a single outer diameter dimension. The second shaft 16 has a length slightly larger than the length of the motor case 2, and has a round bar shape having an outer diameter smaller than the outer diameter of the first shaft 15. Shaft body 16a
Is provided. The second shaft body 16a is formed in a shaft shape having a single outer diameter, so that the second shaft body 16a is formed very simply. The second shaft body 16a has a slight elastic repulsion force in the circumferential direction. Has the function of twisting.

At one end of the second shaft body 16a on the side of the first shaft 15, a first shaft 15 having an outer diameter smaller than the outer diameter of the first shaft body 15a of the first shaft 15 is formed. A shaft-side fixing portion 16b is formed. The second shaft 16 is integrally connected to the first shaft 15 by fitting the first shaft-side fixing portion 16b into the second shaft fitting hole 15d of the first shaft 15. At this time, the second shaft body 16
The second shaft 16 may be integrally formed with the first shaft 15 as one end of the first shaft 15 is connected to the other end of the first shaft 15. In this case, the second shaft 16
Since it is not formed independently of the first shuff site 15, the number of steps can be reduced.

At the other end of the second shaft body 16a,
A pipe member fixing portion 16c is formed. The pipe member fixing portion 16c has the same outer diameter as the first shaft body 16a, and is connected to the other end of the pipe member 17 at a second shaft connecting portion 17b provided in the pipe member 17. .

When a rotational force is applied to the pipe member fixing portion 16c by the armature core 19 fixed to the pipe member 17, the first shaft 15 is moved toward the first shaft side fixing portion 16b. When the rotation is restricted, the second shaft body 16a is twisted in the direction of the rotational force applied to the pipe member fixing portion 16c, and accumulates elastic repulsion. On the contrary, the second shaft 16
When a rotational force is applied to the pipe member fixing portion 16c,
When the first shaft 15 is allowed to rotate on the first shaft side fixing portion 16b side, the rotation force given to the pipe member fixing portion 16c without twisting the second shaft main body 16a is applied to the first shaft 15a. 15 has the function of transmitting the information.

A pipe member 17 is arranged outside the second shaft 16. The pipe member 17 has an inner diameter larger than the outer diameter of the second shaft body 16 a of the second shaft 16 and is formed in a cylindrical shape that covers substantially the entirety of the second shaft 16. 17
a is provided.

An opening 17b is formed in one end of the pipe member main body 17a on the first shaft 15 side. The opening 17b has the same diameter as the pipe diameter of the pipe member main body 17a, and the first shaft 15 extends in the axial direction of the first shaft 15.
Is arranged away from the other end of the first shaft 15, so that it is arranged in non-contact with the other end of the first shaft 15. The opening 17b is in contact with the second shaft body 16a of the second shaft 16 because the pipe member body 17a has an inner diameter larger than the outer diameter of the second shaft body 16a of the second shaft 16. Never do.

The other end of the pipe member body 17a has a second
Is formed. The second shaft coupling portion 17c is coupled to a pipe member fixing portion 16c near the other end of the second shaft 16. At this time, since the outer diameter of the pipe member fixing portion 16c of the second shaft 16 is extremely smaller than the inner diameter of the pipe member main body 17a, the second shaft coupling portion 17c has an outer diameter of the pipe. It is smaller than the member main body 17a and is connected to the second shaft 16. Since the combined second shaft coupling portion 17c is balanced with the second shaft 16, the second shaft coupling portion 17c is formed with an outer diameter smaller than the outer diameter of the pipe member main body 17a and does not swing. The pipe member fixing portion 16c and the second
As a coupling method used for coupling with the shaft coupling portion 17c, caulking, laser welding, shrink fitting, serration, rolling, or the like is used, but laser welding is preferably used.

The pipe member 17 has a second shaft connecting portion 17c at the other end connected to a pipe member fixing portion 16c at the other end of the second shaft 16, and an opening 17b at one end connected to the first shaft. 15, the second shaft 1
6 is disposed away from the second shaft main body 16a, so that when a rotational force is applied from the armature core 19, the rotational force is transmitted to the second shaft 16 through the second shaft coupling portion 17c. At this time, the pipe member main body 17a and the opening 17b are connected to the second shaft main body 16a.
Does not come into contact with anything.

The pipe member 17 has one end inserted into the pipe member receiving portion 9c of the intermediate bearing 9, and the second shaft 16 fixed to the pipe member fixing portion 16c near the other end of the second shaft 16. Since the other end of the second shaft 16 is inserted into the second bearing 8 near the shaft coupling portion 17c, the pipe member receiving portion 9c of the intermediate bearing 9 and the second bearing 8
And rotatably supported at two points.

The armature shaft 18 has one end of the first shaft 15 supported by the first bearing 7, and the other end of the first shaft 15 supported by the first shaft receiving portion 9 b of the intermediate bearing 9. The opening 17 b at one end of the pipe member 17 is provided in the pipe member receiving portion 9 of the intermediate bearing 9.
c and the second end of the pipe member 17 on the other end side.
Is supported by the second bearing 8 by the other end of the second shaft 16, so that the whole is supported at four points.

Further, the armature shaft 18 is
Are supported by the first bearing 7 while the other end of the first shaft 15 is supported by the first shaft receiving portion 9b provided in the intermediate bearing 9 so that they approach each other. First bearing 7 and intermediate bearing 9
By the support of the first shaft receiving portion 9b, the rotational force given by the second shaft 16 is efficiently converted into the rotational force for rotating the wheel gear 10.

In the armature shaft 18, the opening 17 b of the pipe member 17 is supported by the pipe member receiving portion 9 c of the intermediate bearing 9, while the second shaft connecting portion 17 c of the pipe member 17 is connected to the second shaft 16. Is supported by the second bearing 8 together with the other end of the armature core 19, the rotational force generated in the armature core 19 is reliably converted into the rotational force of the pipe member 17, and no vibration occurs at both ends.

An armature core 19 is fixed substantially outside the center of the pipe member 17. The armature core 19 has a winding portion 19a having a predetermined number of slots.
Are formed. In the vicinity of the armature core 19,
A commutator 20 is fixed on the pipe member 17. The commutator 20 is provided with the same number of commutator pieces 20 a as the winding portions 19 a of the armature core 19. The armature core 21 has armature coils 21 electrically connected to the commutator pieces 20a wound around the winding portion 19a. The armature core 19 is arranged in a non-contact manner on inner peripheral portions of the first and second magnets 4 and 5.

Outside the commutator 20 of the armature 6, first and second brushes 13 and 14 are arranged facing each other so as to be electrically connectable to the commutator piece 20a. The first and second brushes 13 and 14 are held by brush springs 28 and 29 on the holder base 27 attached to the opening side of the motor case 2 while being pressed toward the respective commutator pieces 20a. Are electrically connected to an external control circuit (not shown) by the external connection wiring 30 shown in FIG. The control circuit is provided with a window open switch and a window close switch.

When the window open switch of the control circuit is turned on, the armature 6 is supplied with the electric potential of the power supply to the first brush 13 through the external connection wiring 30 and the second brush 14 is grounded. 20, a current of the power supply flows toward the first brush 13, the armature coil 21, and the second brush 14, a magnetic force is generated in the winding portion 19 a of the armature core 19, and a magnetic force generated from the armature core 19 First,
The electromagnetic force generated by the magnetic force generated by the second magnets 4 and 5 applies a positive rotating force to the pipe member 17 of the armature shaft 18.

In the armature 6, the pipe member 17 to which the rotational force in the forward direction is applied is connected to the pipe member fixing portion 16c of the second shaft 16 at the second shaft connecting portion 17c. Since the rotation of the shaft 15 is not restricted, the second shaft 16 and the first shaft 15 rotate forward by the forward rotating force applied to the pipe member fixing portion 16c, and the wheel gear 10 rotates forward.

On the other hand, when the window close switch of the control circuit is turned on, the potential of the power supply is applied to the second brush 14 through the external connection wiring 30 and the first brush 13 is grounded. , The second brush 14, the armature coil 21, the first
The current of the power supply flows toward the brush 13 of the armature, and a magnetic force is generated in the coil winding portion 19a of the armature core 19,
The magnetic force generated by the armature core 19, the first and second
The rotational force in the opposite direction is applied to the pipe member 17 of the armature shaft 18 by electromagnetic induction by the magnetic force generated from the magnets 4 and 5.

Then, the armature 6 causes the second shaft 16 and the first shaft 15 to rotate in the reverse direction due to the rotational force in the opposite direction given to the pipe member fixing portion 16c, causing the wheel gear 10 to rotate in the reverse direction.

On the other hand, the worm 15b formed on the first shaft 15 of the armature shaft 18 is engaged with the wheel gear 10.

The wheel gear 10 has a star-shaped (polygonal) concave damper accommodating portion 10b formed inside a tooth portion 10a meshed with the worm 15b. The damper accommodating portion 10b has a damper accommodating portion 10b. A rubber damper 11, which has a shape similar to that of the housing portion 10b and is made of rubber, is fitted therein. Damper 11
A metal hub 31 having a U-shape is integrally fixed at the center thereof, and the output shaft 12 is coupled to the hub 31. A window glass (not shown) is connected to the output shaft 12 via a glass elevator (not shown).

When the armature shaft 18 rotates forward, the power is transmitted through the worm 15b to rotate the wheel gear 10 forward.
Is transmitted to the hub 31 via the damper 11 to rotate the output shaft 12 forward to open the window glass. When the window glass reaches the fully open position, which is the stroke end, the position sensor (not shown) detects that the window glass has reached the fully open position. Therefore, the control circuit cuts off the current supply to the first and second brushes 13 and 14. It is turned off, and then the forward rotation of the armature shaft 18 stops, and the wheel gear 10 stops the forward rotation.

After the window glass reaches the fully opened stroke end, the power supply to the first and second brushes 13 and 14 is cut off with a delay, so that the output shaft is stopped until the wheel gear 10 stops rotating forward. While the rotation of the armature shaft 12 is restricted, the armature shaft 18 rotates in the forward direction. When the armature shaft 18 rotates in the forward direction, the wheel gear 10 to which the rotational force is applied from the worm 15b of the first shaft 15 rotates in the forward direction, and the damper 11 is elastically deformed. After that, even after the elastic deformation of the damper 11 is completed, a forward rotational force is continuously applied to the pipe member 17 to which the armature core 19 is fixed.
Due to the rotation force in the forward direction, the second shaft 16 is twisted in the forward rotation direction, and only the pipe member 17 to which the armature core 19 is fixed rotates in the forward direction to rotate the second shaft 1.
6 is twisted, and the elastic repulsive force due to the twist is accumulated in the second shaft 16.

When the power supply to the first and second brushes 13 and 14 is cut off, the armature core 1
The rotational force with respect to the pipe member 17 to which 9 is fixed is released. When the rotational force is no longer applied to the pipe member 17,
The second shaft 16 in which the elastic repulsive force is accumulated returns and rotates by its own restoring force in a direction of reverse rotation opposite to the forward direction rotational force applied to the pipe member 17. At the same time, the damper 1 has been elastically deformed and has accumulated elastic repulsion.
1 generates a restoring force, the wheel gear 10 rotates in the opposite direction, and the damper 11 elastically recovers.
0 ends the rotation in the reverse direction and stops. Therefore, the wheel gear 10 stops without biting the worm 15b of the first shaft 15 due to the elastic recovery of the damper 11.

On the contrary, the armature shaft 18
When the gear rotates in the reverse direction, the power is transmitted through the worm 15b and the gear rotates in the reverse direction, so that the wheel gear 10 rotates in the reverse direction. 12 is rotated in the reverse direction to close the window glass. When the window glass reaches the fully closed position at the stroke end, the position sensor (not shown) detects that the window glass has reached the fully closed position, and the control circuit supplies power to the second and first brushes 14 and 13. Is cut off and the armature shaft 1
8 is stopped, and the wheel gear 10 stops the reverse rotation. At this time, when the window glass reaches the fully-closed position, the second and first brushes are pressed after the window glass is pressed against the vehicle body and closed to improve the adhesion between the window glass and the vehicle body such as a door panel. The energization to 14 and 13 is cut off. Therefore, when the window glass is closed toward the vehicle body at the fully closed position, the damper 11 is elastically deformed by the rotation of the wheel gear 10 relative to the output shaft 12.

After the window glass has reached the fully closed stroke end, the power supply to the second and first brushes 14 and 13 is cut off with a delay, so that the output is maintained until the wheel gear 10 stops reverse rotation. While the shaft 12 is restrained from rotating, the armature shaft 18 rotates in the opposite direction. When the armature shaft 18 rotates in the reverse direction, the wheel gear 10 to which the rotational force is applied from the worm 15b of the first shaft 15 rotates in the reverse direction, and the damper 11 is elastically deformed. Thereafter, even after the elastic deformation of the damper 11 is completed, the rotational force in the opposite direction is continuously applied to the pipe member 17 to which the armature core 19 is fixed.
Due to the rotational force in the reverse direction, the second shaft 16 is twisted in the reverse rotation direction, and only the pipe member 17 to which the armature core 19 is fixed rotates in the reverse direction to rotate the second shaft 1.
6 is twisted, and the elastic repulsive force due to the twist is accumulated in the second shaft 16.

When the power supply to the second and first brushes 14 and 13 is cut off, the armature core 1 is turned off.
The rotational force with respect to the pipe member 17 to which 9 is fixed is released. When the rotational force is no longer applied to the pipe member 17,
The second shaft 16 in which the elastic repulsive force is accumulated returns and rotates by its own restoring force in the direction of the normal rotation opposite to the rotation force in the opposite direction given to the pipe member 17. At the same time, the damper 1 has been elastically deformed and has accumulated elastic repulsion.
1 generates a restoring force, the wheel gear 10 rotates in the forward direction, and the damper 11 is elastically restored.
0 ends the rotation in the forward direction and stops. Therefore, the wheel gear 10 stops without biting the worm 15b of the first shaft 15 due to the elastic recovery of the damper 11. At this time, immediately after the window glass has reached the fully closed position, the first and second brushes 13 and 14 are energized for a short time to move the window glass from the fully closed position to the opening direction. Stop,
Thereafter, when the second and first brushes 14 and 13 are energized again, the damper 11 is once elastically restored when the window glass reaches the fully closed position. Even if moved to the closed position, the shock from the window glass is absorbed by the damper 11, and a large shock is not transmitted to the wheel gear 10 and the worm 15b. Even if the window glass stops at any position, the damper 11 returns to the elastically restored state, but stops rotating when the torsional stress on the second shaft is released. The starting torque required when the armature 9 starts rotating by applying more rotational force can be reduced.

The small motor 1 having such a structure is
The gear case 3 is mounted inside the door panel, the output shaft 12 is connected to the window glass via a glass elevator, and the external connection wiring 30 is electrically connected to a control circuit and mounted on the vehicle body.

When the current is supplied from the first brush 13 to the second brush 14 by turning on the window open switch of the control circuit, the pipe member 17
Is supplied to the first shaft 15 through the second shaft 16 from the second shaft coupling portion 17c of the pipe member 17, and the first direction is transmitted to the first shaft 15.
The wheel gear 10 starts to rotate forward through the worm 15b of the shaft 15, and the window glass moves toward the fully open position.

When the window glass reaches the fully open position and collides with the vehicle body, the damper 11 is elastically deformed, and the second shaft 16 is elastically deformed by being twisted in the forward rotation direction, and the first and second brushes 13 and The cut-off of the current supply to 14 causes the second shaft 16 in which the elastic repulsive force is accumulated to return in the opposite direction and rotate, causing the first shaft 15 to rotate in the opposite direction and simultaneously undergo elastic deformation. The damper 11, in which the elastic repulsive force is accumulated, is elastically restored, and the wheel gear 1
0 is rotated in the opposite direction, and the wheel gear 10 stops in a state where it does not bite into the worm 15b of the first shaft 15.

On the other hand, when the window closing switch of the control circuit is turned on in a state where the window glass is in the fully open position, the second brush 14 is switched to the first brush 1.
When the current is supplied to the pipe member 3, a rotational force in the opposite direction is applied to the pipe member 17, and the second shaft coupling portion 17 c of the pipe member 17 causes the second shaft 16 to pass through the second shaft 16 to the first shaft 15. The rotational force is transmitted, the wheel gear 10 starts reverse rotation via the worm 15b of the first shaft 15, and the window glass moves toward the fully closed position.

When the window glass reaches the fully closed position and collides with the vehicle body, the damper 11 is elastically deformed, and the second shaft 16 is elastically deformed by being twisted in the reverse rotation direction. , 13 are cut off, the second shaft 16 in which the elastic repulsive force is accumulated returns in the forward direction and rotates, and the first shaft 15 rotates in the forward direction. As a result, the damper 11 in which the elastic repulsive force is accumulated is elastically restored, and the wheel gear 1
0 is rotated in the forward direction, and the wheel gear 10 stops in a state where it does not bite into the worm 15b of the first shaft 15.

FIG. 4 shows a second embodiment of the small-sized motor according to the present invention, and shows only the periphery of the armature shaft.

In this case, the pipe member 17 is provided with a pipe member main body 17a and an opening 17b, respectively, as in the first embodiment. A second shaft coupling portion 17c having an elongated shape is also formed, and a second bearing insertion portion 17d is formed at an end of the second shaft coupling portion 17c. Other parts are the same as in the first embodiment.

The second bearing insertion portion 17d is formed in a cylindrical shape with the same outer diameter as the second shaft coupling portion 17c, and is balanced with the second shaft 16, so that the outer shape is reduced. Since it is formed concentrically with the second shaft 16 in a perfect circle, it is formed with an outer diameter smaller than the outer diameter of the pipe member main body 17a and does not swing. The second bearing insertion portion 17 d is arranged outside the other end of the second shaft 16, is inserted into the second bearing 8 together with the other end of the second shaft 16, and It is rotatably supported by a bearing 8.

In the armature shaft 18 in this case, one end of the first shaft 15 is supported by the first bearing 7, and the other end of the first shaft 15 is
The opening 17b at one end of the pipe member 17 is supported by the pipe member receiving portion 9c of the intermediate bearing 9, and the other end of the pipe member 17 is inserted through the second bearing. The portion 17d is the second shaft 16
Are supported by the second bearing 8 together with the other end of the support, so that the whole is supported at four points.

The armature shaft 18 has one end of the first shaft 15 supported by the first bearing 7, and the other end of the first shaft 15 has a first shaft receiving portion provided on the intermediate bearing 9. Since the first shaft receiving portion 9b is supported by the first shaft receiving portion 9b of the first bearing 7 and the intermediate bearing 9 which are close to each other, the rotational force given by the second shaft 16 rotates the wheel gear 10. Is efficiently converted into rotational force for the rotation.

In the armature shaft 18 in this case, the second bearing insertion portion 17d of the pipe member 17 is rotatably supported by the second bearing 8.
A second bearing 8 having a larger inner diameter than that of the first embodiment is used. In addition, the second shaft 16 may be a polygonal prism such as a quadrangular prism or a pentagonal prism in addition to the columnar shape. 17c is connected to the second shaft 16 and the second end of the pipe member 17 is provided outside the other end of the second shaft 16.
The outer shape of the bearing insertion portion 17d is concentric with the second shaft 16 and is processed into a perfect circle.

The small motor 1 in this case also operates in the same manner as in the first embodiment. When the window glass reaches the fully opened position and collides with the vehicle body, the damper 11 is elastically deformed, and the second shaft 16, both ends of which are supported by the first shaft receiving portion 9 b and the second bearing 8 of the intermediate bearing 9. Is elastically deformed by being twisted in the direction of forward rotation, and then the first and second
The second shaft 1 having the elastic repulsive force accumulated by cutting off the current supply to the brushes 13 and 14
6, the first shaft 15 is rotated in the reverse direction, and at the same time, the damper 11, which has been elastically deformed and the elastic repulsive force is accumulated, is elastically restored, and the wheel gear 10 is rotated.
Are turned in the opposite direction, and the worm 1 of the first shaft 15 is
The wheel gear 10 stops in a state where the wheel gear 10 does not bite into 5b.

With the window glass in the fully open position,
When the window close switch of the control circuit is turned on, the window glass moves toward the fully closed position,
When the window glass reaches the fully closed position and collides with the vehicle body, the damper 11 is elastically deformed, and the second shaft 16 supported by the first shaft receiving portion 9b of the intermediate bearing 9 and the second bearing 8 is moved. The second shaft 16 is elastically deformed by being twisted in the reverse rotation direction and cut off the current supply to the second and first brushes 14 and 13, whereby the second shaft 16 in which the elastic repulsive force is accumulated returns in the forward direction and rotates. As a result, the first shaft 15 is rotated in the forward direction, and at the same time, the damper 11 that has been elastically deformed and the elastic repulsive force is accumulated is elastically restored, and the wheel gear 10 is rotated in the forward direction. The wheel gear 10 stops in a state where it does not bite into the worm 15b of the shaft 15 of FIG.

FIGS. 5 and 6 show a third embodiment of the small-sized motor according to the present invention, showing only a portion around the armature shaft.

In this case, the intermediate bearing 9 in the first embodiment is composed of a first shaft side bearing 32 and a pipe member side bearing 3 formed independently of the first shaft side bearing 32.
3 and the other parts are the same as in the first embodiment.

The first shaft side bearing 32 is disposed outside the other end of the first shaft 15, and is inserted into the inner peripheral portion by inserting the other end of the first shaft 15.
The other end of the first shaft 15 is rotatably supported.

The pipe member-side bearing 33 is connected to the pipe member 17.
The opening 17b of the pipe member 17 is rotatably supported by the opening 17b of the pipe member 17 being inserted through the inner peripheral portion.

In this case, one end of the first shaft 15 is rotatably supported by the first bearing 7, and the other end thereof is connected to the pipe member 17 by the first shaft side bearing 32 of the intermediate bearing 9. Are independently rotatably supported. Therefore, even if bending stress is applied to the worm 15b of the first shaft 15, the relatively short first shaft 15 is securely supported at both ends at positions where the first shaft 15 does not greatly separate from each other. No large deflection occurs at the end.

The pipe member 1 of the armature shaft 18
7, one end is rotatably supported by the pipe member-side bearing 33, while the second bearing insertion portion 17 d arranged outside the other end of the first shaft 16 is formed by the second bearing 8. It is rotatably supported independently of one shaft 15. Therefore, when the second shaft 16 is twisted by the rotational force given to the pipe member 17 to which the armature core 19 is fixed in a state where the rotation of the first shaft 15 is restricted, the pipe member 17 is twisted. No accompanying stress is applied.

The second shaft 16 of the armature shaft 18 has one end coupled to the first shaft 15 and the other end of the first shaft 15 supported by the first shaft-side bearing 32 of the intermediate bearing 9. The first
Even if bending stress is applied to the worm 15b of the shaft 15, no large deflection occurs at the end.

The small motor 1 in this case also operates in the same manner as in the first embodiment. When the window glass reaches the fully opened position and collides with the vehicle body, the damper 11 is elastically deformed, and the second shaft 16 whose both ends are supported by the first shaft side bearing 32 and the second bearing 8 of the intermediate bearing 9. Is elastically deformed by being twisted in the direction of forward rotation, and then the first and second
The second shaft 1 having the elastic repulsive force accumulated by cutting off the current supply to the brushes 13 and 14
6, the first shaft 15 is rotated in the reverse direction, and at the same time, the damper 11, which has been elastically deformed and the elastic repulsive force is accumulated, is elastically restored, and the wheel gear 10 is rotated.
Are turned in the opposite direction, and the worm 1 of the first shaft 15 is
The wheel gear 10 stops in a state where the wheel gear 10 does not bite into 5b.

With the window glass in the fully open position,
When the window close switch of the control circuit is turned on, the window glass moves toward the fully closed position,
When the window glass reaches the fully closed position and collides with the vehicle body, the damper 11 is elastically deformed, and the first shaft side bearing 3
The second shaft 16 supported by the second and second bearings 8 is elastically deformed by being twisted in the reverse rotation direction, and the second and first brushes 14 and 13 are cut off to supply electric power. The second shaft 16 in which the repulsive force is accumulated returns in the forward direction and rotates to rotate the first shaft 15.
Is rotated in the forward direction, and at the same time, the damper 11, which has been elastically deformed and stores the elastic repulsive force, is elastically restored, and the wheel gear 10 is rotated in the forward direction, so that the worm 15 b of the first shaft 15 Wheel gear 10 without biting
Will stop. The pipe member 17 in this embodiment has an extended second shaft coupling portion 17c formed at the other end of the pipe member main body 17a in the same manner as in the second embodiment. Shaft coupling 17c
A second bearing insertion portion 17d may be formed at the end of the second bearing.

FIGS. 6 and 7 show a fourth embodiment of the small-sized motor according to the present invention, showing only a portion around the armature shaft.

In the small motor 1 in this case, the first shaft-side bearing 32 in the third embodiment is not used, and the intermediate bearing 9 is constituted only by the pipe-member-side bearing 33. Are adapted to rotatably support only one end of the pipe member 17, and the other portions are the same as in the first embodiment.

The intermediate bearing 9 is arranged outside one end of the pipe member 17, and the opening 17 c provided at one end of the pipe member 17 is inserted into the inner peripheral portion, so that one end of the pipe member 17 is inserted. The part is rotatably supported.

In this case, one end of the first shaft 15 of the armature shaft 18 is rotatably supported by the first bearing 7, but the other end is not supported. However, since the other end of the first shaft 15 is connected to one end of the second shaft 16, the first and second shafts 15 and 16 are connected to one end of the first shaft 15 by the first shaft 15. While being rotatably supported by a bearing 7 of the
At the other end of the shaft 16, the other end of the pipe member 17 is rotatably supported by the second bearing 8, so that it is supported at two points at both ends. for that reason,
The armature shaft 18 does not transmit the impact force to the pipe member 17 when an impact force is applied from the wheel gear 10 to the combined body including the first shaft 15 and the second shaft 16.

The small motor 1 in this case also operates in the same manner as in the first embodiment. When the window glass reaches the fully opened position and collides with the vehicle body, the damper 11 is elastically deformed, and the second shaft is supported by the first and second shafts 15 and 16 supported by the first bearing 7 and the second bearing 8. Shaft 16 is twisted in the forward rotation direction to be elastically deformed, and the first and second shafts 16 are rotated.
The second shaft 1 having the elastic repulsive force accumulated by cutting off the current supply to the brushes 13 and 14
6, the first shaft 15 is rotated in the reverse direction, and at the same time, the damper 11, which has been elastically deformed and the elastic repulsive force is accumulated, is elastically restored, and the wheel gear 10 is rotated.
Are turned in the opposite direction, and the worm 1 of the first shaft 15 is
The wheel gear 10 stops in a state where the wheel gear 10 does not bite into 5b.

With the window glass in the fully open position,
When the window close switch of the control circuit is turned on, the window glass moves toward the fully closed position,
When the window glass reaches the fully closed position and collides with the vehicle body, the damper 11 elastically deforms, and the first bearing 7 and the second
In the first and second shafts 15, 16 supported by the bearings 8, the second shaft 16 is twisted in the reverse rotation direction and elastically deforms, and the second and first brushes 14, 13 are deformed.
Is cut off, the second shaft 16 in which the elastic repulsive force is accumulated returns and rotates in the forward direction, and the first shaft 15 rotates in the forward direction. Damper 1 with accumulated elastic repulsion
When the wheel gear 10 is elastically restored, the wheel gear 10 is rotated in the forward direction, and the wheel gear 10 stops in a state where the wheel gear 10 does not bite into the worm 15b of the first shaft 15. The pipe member 17 in this embodiment has an extended second shaft coupling portion 17c formed at the other end of the pipe member main body 17a in the same manner as in the second embodiment.
A second bearing insertion portion 17d may be formed at an end of the second shaft coupling portion 17c.

[0094]

As described above, according to the small motor according to the first aspect of the present invention, after the load moves to the stroke end and the output shaft is restrained from rotating, the current to the brush is cut off. In the meantime, the pipe member in which the second shaft coupling portion is coupled to the other end side of the second shaft, the other end portion of which is rotatably supported by the second bearing, has a given rotational force. To apply a rotational force to the other end of the second shaft via the second shaft coupling portion, so that the second shaft and the first shaft rotate,
The wheel gear rotates, and the elastic member elastically deforms. When the elastic member has been elastically deformed, the first shaft stops rotating, the second shaft is elastically twisted with respect to the first shaft, and an elastic repulsive force is accumulated in the second shaft. Thereafter, when the rotational force is not applied to the pipe member, the rotational force in the opposite direction is applied to the wheel gear by the elastic restoring force applied from the elastic member, and at the same time, the elastic repulsive force is accumulated by being twisted. A rotational force in the opposite direction is applied to the first shaft from the second shaft. Therefore, the torque generated when the elastic member that has been elastically deformed is restored and the torque of the first shaft that rotates in the opposite direction due to the restoring force of the second shaft are combined, and the wheel gear is quickly returned. Further, since the second shaft has a single outer diameter, it has an excellent effect that the second shaft can be easily formed.

According to the small-sized motor according to the second aspect of the present invention, the second movement is performed between the time when the load is moved to the stroke end and the rotation of the output shaft is restrained and the time when the current supply to the brush is cut off. The pipe member in which the second bearing insertion portion is rotatably supported by the bearing applies a rotational force to the second shaft coupling portion near the other end of the second shaft by the applied rotational force. The second shaft and the first shaft rotate, the wheel gear rotates, and the elastic member elastically deforms. When the elastic member has been elastically deformed,
The first shaft stops rotating, the second shaft is elastically twisted with respect to the first shaft, and an elastic repulsive force is accumulated on the second shaft. Thereafter, when the rotational force is not applied to the pipe member, the rotational force in the opposite direction is applied to the wheel gear by the elastic restoring force applied from the elastic member, and at the same time, the elastic repulsive force is accumulated by being twisted. A rotational force in the opposite direction is applied to the first shaft from the second shaft. Therefore, the torque generated when the elastic member that has been elastically deformed is restored and the torque of the first shaft that rotates in the opposite direction due to the restoring force of the second shaft are combined, and the wheel gear is quickly returned. In addition, since the second shaft has an axial shape, the second shaft has an excellent effect that it can be easily formed.

According to the small motor according to the third aspect of the present invention, the second shaft is formed without being coupled to the first shaft. Therefore, in addition to the effects of the first and second aspects, the first shaft and the second shaft are not independently manufactured but are simultaneously manufactured in a single step.

According to the small motor according to the fourth aspect of the present invention, the second shaft connecting portion of the pipe member has an outer diameter smaller than that of the pipe member main body. Therefore, in addition to the effects of the first and second aspects, rotational runout is less likely to occur at the other end of the second shaft and the other end of the pipe member.

According to the small motor according to the fifth aspect of the present invention, the armature shaft has the pipe member rotatably supported by the pipe member receiving portion of the intermediate bearing and the second bearing, while the first shaft Are rotatably supported by a first shaft receiving portion and a first bearing integrally formed on the intermediate bearing via a middle relief portion with the pipe member receiving portion. Therefore, in addition to the effects of the first and second aspects, the bearing for supporting the other end of the first shaft and the bearing for supporting the opening of the pipe member have a single structure, which is necessary for manufacturing. It has an excellent effect that the number of man-hours does not increase.

According to the small motor according to the sixth aspect of the present invention, the width of the first shaft is larger than the width of the first bearing disposed on one end side of the first shaft and the pipe member receiving portion. It is rotatably supported by the first shaft receiving portion of the intermediate bearing. Therefore, in addition to the effect of the fifth aspect, both ends of the first shaft transmitting the rotational force from the worm to the wheel gear are reliably supported by the first bearing and the first shaft receiving portion. It has excellent effects.

According to the small motor according to the seventh aspect of the present invention, the armature shaft has the pipe member rotatably supported by the pipe member side bearing and the second bearing, while the first shaft is the first shaft. And the first shaft-side bearing are rotatably supported. Therefore,
In addition to the effects of claims 1 and 2, the pipe member transmits the rotational force applied from the armature core to the second shaft without swinging at both ends. In addition, the first shaft has an excellent effect of transmitting the rotational force given from the second shaft to the wheel gear without deflection at both ends.

According to the small motor of the present invention, the width of the first shaft is larger than that of the first bearing disposed on one end side of the first shaft and the pipe member side bearing. It is rotatably supported by the first shaft-side bearing. Therefore, in addition to the effect of the seventh aspect, both ends of the first shaft transmitting the rotational force from the worm to the wheel gear are reliably supported by the first bearing and the first shaft-side bearing. It has excellent effects.

According to the small motor of the ninth aspect of the present invention, the combined body composed of the first shaft and the second shaft includes the first bearing disposed at one end of the first shaft, It is rotatably supported at two points separated by a second bearing disposed at the other end of the pipe member. Therefore,
In addition to the effects of claims 1 and 2, the first shaft and the second shaft
Even if an impact force is given from the wheel gear to the combined body composed of the shaft and the shaft member, there is an excellent effect that the impact force is hardly transmitted to the pipe member.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view of a first embodiment of a small motor according to the present invention.

FIG. 2 is a vertical sectional side view around an output shaft of the small motor shown in FIG.

FIG. 3 is a perspective view for explaining a combination of an intermediate bearing and an armature shaft in the small motor shown in FIG. 1;

FIG. 4 is a longitudinal sectional front view around an armature shaft of a small motor according to a second embodiment of the present invention.

FIG. 5 is a longitudinal sectional front view around an armature shaft of a small motor according to a third embodiment of the present invention.

FIG. 6 is a perspective view illustrating a combination of an intermediate bearing and an armature shaft in the small motor shown in FIG.

FIG. 7 is a vertical sectional front view around an armature shaft of a small motor according to a fourth embodiment of the present invention.

FIG. 8 is a perspective view illustrating a combination of an intermediate bearing and an armature shaft in the small motor shown in FIG. 7;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Small motor 4 (Magnet) 1st magnet 5 (Magnet) 2nd magnet 7 1st bearing 8 2nd bearing 9 Intermediate bearing 9b 1st shaft receiving part 9c Pipe member receiving part 9d Middle relief part 10 Wheel Gear 11 (elastic member) damper 12 output shaft 13 (brush) first brush 14 (brush) second brush 15 first shaft 15b worm 16 second shaft 17 pipe member 17a pipe member body 17b opening 17c 2 shaft coupling portion 17d second bearing insertion portion 18 armature shaft 19 armature core 20 commutator 21 armature coil 32 first shaft side bearing 33 pipe member side bearing

Claims (9)

[Claims] A first shaft having a worm formed between one end and the other end, a shaft having a single outer diameter, and one end coupled to the other end of the first shaft; A second shaft extending in the axial direction of the first shaft and inserted into the second bearing, and having one end and the other end elastically twistable, An opening is disposed outside the second shaft, is formed at one end thereof in a non-contact manner at one end of the second shaft, and is provided at the other end thereof at the other end of the second shaft. An armature shaft having a pipe member formed with a second shaft coupling portion coupled thereto, one end of a first shaft of the armature shaft is inserted, and one end of the first shaft is rotatable; A first bearing supported on the armature shaft; A second bearing through which the other end of the second shaft is inserted and rotatably supports the other end of the second shaft; and an opening in the pipe member of the armature shaft or the other of the first shaft. An end bearing is inserted, and an intermediate bearing rotatably supports an opening of the pipe member or the other end of the first shaft; an armature core fixed on the pipe member of the armature shaft; and an armature core of the armature core. A commutator fixed on the pipe member in the vicinity, an armature coil wound around the armature core, and electrically connected to the commutator; and a commutator electrically connected to the commutator. A brush arranged outside, a magnet arranged outside the armature core, and an armature A wheel gear meshed with a worm of a first shaft provided on the shaft, an elastic member housed in the wheel gear, and an output shaft coupled to the elastic member and coupled to a load. Features a small motor. 2. A first shaft having a worm formed between one end and the other end, a first shaft having an axial shape, one end coupled to the other end of the first shaft, and the other end. A second shaft extending in the axial direction of the first shaft and inserted into the second bearing, and having a second end between one end and the other end that can be elastically twisted; An opening is formed on one end of the second shaft, the opening is formed on one end of the second shaft in a non-contact manner, and the other end of the second shaft is connected to the other end of the second shaft. An armature shaft having a pipe member formed with a second bearing insertion portion inserted into the second bearing outside the other end of the second shaft coupling portion and the second shaft; One end of the first shaft is inserted, and one end of the first shaft A first bearing rotatably supporting a portion of the armature shaft, a second shaft coupling portion of the pipe member of the armature shaft being inserted, and a second bearing rotatably supporting a second bearing insertion portion of the pipe member. An intermediate bearing through which the opening of the pipe member of the armature shaft or the other end of the first shaft is inserted and rotatably supports the opening of the pipe member or the other end of the first shaft; An armature core fixed on the pipe member of the armature shaft, a commutator fixed on the pipe member near the armature core, and wound around the armature core and electrically connected to the commutator Armature coil, and electrically connected to the commutator, and arranged outside the commutator. A brush, a magnet disposed outside the armature core, a wheel gear meshed with a worm of a first shaft provided on the armature shaft, an elastic member housed in the wheel gear, and an elastic member. A small motor having an output shaft coupled to a load and coupled to a load. 3. The small motor according to claim 1, wherein the second shaft is formed integrally with the first shaft. 4. The pipe member is provided with a pipe member main body outside the second shaft, and the second shaft coupling portion of the pipe member is formed to have an outer diameter smaller than the pipe member main body. The small motor according to claim 1 or 2, wherein: 5. A first shaft receiving portion through which the other end of the first shaft is inserted and which rotatably supports the other end of the first shaft, and an opening in the pipe member. Is disposed between the first shaft receiving portion and the pipe member receiving portion for rotatably supporting the opening of the pipe member through which the opening portion of the pipe member is inserted, and the other end of the first shaft and the pipe member are disposed. The small motor according to claim 1, wherein a non-contact middle escape portion is formed integrally with each of the openings. 6. The small motor according to claim 5, wherein in the intermediate bearing, a width of the first shaft receiving portion is formed larger than a width of the pipe member receiving portion. 7. A first shaft-side bearing through which the other end of the first shaft is inserted and which rotatably supports the other end of the first shaft, to the intermediate bearing, and the first shaft. A pipe member-side bearing formed independently of the side bearing, and through which an opening of the pipe member is inserted to rotatably support the opening of the pipe member. 3. The small motor according to 2. 8. The small motor according to claim 7, wherein the intermediate bearing is formed such that a width of the first shaft-side bearing is larger than a width of the pipe member-side bearing. 9. The intermediate bearing is provided with only a pipe member-side bearing through which an opening of a pipe member is inserted and rotatably supporting the opening of the pipe member. 3. The small motor according to 2.