JP2003056654A - Motor device with speed reducer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To favorably retain the engagement state between a worm wheel having an arc part coaxially and integrally rotating with a sun gear and a worm even if using helical gears having a superior quietness for the sun gear and planetary gears in a motor device having a speed reducer connecting a worm reducing gear and a planetary reducing gear into two stages. SOLUTION: When a motor part 11 rotates the worm 24 in a prescribed rotation direction (rotating about an arrow S), an axial reaction f2 is applied to the sun gear part 36 from the respective planetary gears 41. The inclination directions of the sun gear part 36, the respective planetary gears 41, and the helical gears 36a, 41a, and 42a of an internal gear 42 are so set that the reaction f2 applies in the direction of energizing a gear body 25 and the arc part 38 of the teeth 37 of the worm wheel part 35 is deeply geared with the teeth 24a of the worm 24.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor device with a speed reducer in which a motor section and a speed reducer are integrated.

[0002]

2. Description of the Related Art Conventionally, for example, a wiper device mounted on a vehicle uses a wiper motor device that decelerates and outputs a rotation of a motor. The wiper motor device has a motor unit and a speed reducer integrated with each other. As such a motor device, the applicant of the present invention has proposed it and has been disclosed in
There is a motor published in 1-61257. A worm gear reducer is used as a speed reducer in this motor device.

[0003]

By the way, there is a demand for downsizing and weight reduction of a motor device, and it is necessary for a worm gear reducer, which occupies a large part thereof, to realize a larger reduction ratio with a smaller volume. ing. However, in the worm gear reducer, the diameter dimension of the worm wheel almost determines the reduction ratio, so that the worm wheel and hence the worm gear reducer cannot be made compact and lightweight, and it has been difficult to make the motor device compact and lightweight.

Therefore, the applicant of the present invention, as shown in FIG.
A motor device 80 having a speed reducer in which a worm gear speed reducer and a planetary gear speed reducer are connected in two stages is considered. In this motor device 80, the motor section 81 operates to rotate its rotation shaft 82.
When is rotated, the worm 83 is integrally rotated, and the worm wheel 84 is rotated. When the worm wheel 84 rotates, the sun gear 85 rotates integrally, causing each planet gear 86 to rotate. Each planetary gear 86 rotates around the sun gear 85 while revolving around the sun gear 85 while rotating around the inner gear 88 of the internal gear 88 fixed to the housing 87. Then, the output shaft 90 rotates together with the planet gear carrier 89. As a result, the rotation of the rotary shaft 82 of the motor unit 81 is reduced in two stages by the worm gear reducer and the planetary gear reducer and output from the output shaft 90.

However, when the planetary gear reducer is used as described above, gear noise is generated between the sun gear 85 and the planetary gears 86, and between the planetary gears 86 and the internal gear 88, resulting in a large noise. There is. As a measure against this,
The gears 85, 86, 88 may be helical gears,
A force in the axial direction is generated between the gears 85, 86, 86, 88 which are meshed with each other in accordance with the rotation direction of the gears 85, 86, 88 and the inclination direction of the helical bars.

On the other hand, in the normal worm gear reducer, the teeth of the worm wheel 84 are formed in an arc shape along the teeth of the worm 83 in order to bring the worm 83 and the worm wheel 84 into line contact (increasing the meshing allowance). There is.
However, in the motor device 80, at the time of manufacturing the motor device 80, after the motor portion 81 is assembled to the housing 87, the output shaft 90 supporting the worm wheel 84 is assembled to the housing 87, and the worm wheel 84 is moved in the axial direction in this state. And meshes with the worm 83. For this reason, the teeth of the worm wheel 84 cannot be formed into an arc shape over the entire axial direction thereof, and only one half of one side in the axial direction is formed into an arc shape along which the teeth of the worm 83 are formed. It is said that.

However, when the worm wheel 84 having the arcuate portion 84a only on one side is provided as described above, the worm wheel 84 is not constrained in the axial direction with respect to the worm 83. And the sun gear 85
When the direction of the axial force applied from each planetary gear 86 is the direction shown by the arrow B in FIG. 7, the worm wheel 84 may float above the worm 83, and the meshing state may become shallow. That is, when the integrated worm wheel 84 and sun gear 85 are supported in a state where there is play in the axial direction with respect to the housing 87, an arc force 84 a is applied to the worm wheel 84 from the worm 83 in the axial direction. Is warm 83
Worm wheel 84 and sun gear 8
5 moves. Then, the meshing state of the worm 83 and the worm wheel 84 becomes shallower, and both gears 83, 84
Has a problem in that the tooth tips are in mesh with each other and the strength of each tooth decreases.

The present invention has been made to solve the above-mentioned problems, and an object thereof is to provide a sun gear in a motor device having a speed reducer in which a worm speed reducer and a planetary speed reducer are connected in two stages. Provided with a speed reducer motor device that can maintain a good meshing condition between a worm wheel and a worm wheel that has an arc part that rotates integrally with the sun gear on the same axis line even if the planetary gear uses a highly quiet hasha To do.

[0009]

In order to solve the above-mentioned problems, the invention according to claim 1 is characterized in that a housing provided with a motor part is provided with a worm gear reducer, a planetary gear reducer and an output shaft, The motor part rotates the worm, and this worm integrally rotates the sun gear provided coaxially with the worm wheel together with the worm wheel, and the sun gear cooperates with the internal gear to rotate and revolve the planet gears. In the motor device with a speed reducer in which the planetary gear rotates the output shaft together with the gear carrier, the teeth of the worm wheel are formed in an arc shape in which substantially half of one side in the axial direction is along the teeth of the worm. The sun gear and the planet gears are helical gears, and the direction of inclination of the helical gears of the sun gear and the planet gears is The worm wheel is attached so that the direction of the axial reaction force applied to the sun gear from the planetary gears when the worm rotates the worm in the specified rotation direction presses the arc portion of the worm wheel tooth against the worm tooth. It is characterized in that it is set to be in a direction of energizing.

According to the first aspect of the present invention, the sun gear and the planet gears of the planetary speed reducer are provided with the hassbars having excellent quietness, and moreover, the axial line acting from the planet gears to the sun gear by the use of the hassuba. The reaction force in the direction acts on the worm wheel, which has an arc portion that rotates integrally with the sun gear on the same axis, to deepen the mesh between the worm wheel and the worm wheel. It is possible to suppress the lifting of the two with respect to each other, and maintain the meshed state of the two in a good condition.

According to a second aspect of the present invention, in the first aspect of the present invention, the inclination direction of the teeth of the worm and the worm wheel is from the worm to the worm when the motor unit rotates the worm in the rotation direction. The direction of the axial component force applied to the wheel is set so as to urge the worm wheel so as to press the circular arc portion against the teeth of the worm.

According to the invention of claim 2, claim 1
In addition to the effect of the invention described in (1), the lifting of the worm wheel with respect to the worm is suppressed by the axial component force applied from the worm to the worm wheel when the motor device is loaded. Then, the meshing state between the worm and the worm wheel is further suppressed from becoming shallower, and the meshing state is more favorably maintained.

According to a third aspect of the present invention, in the invention according to the first or second aspect, the urging direction of the worm wheel is such that the worm wheel is supported when the worm wheel is assembled to the housing. The output shaft thus supported is supported by the housing, and in this state, the worm wheel is moved in the axial direction to engage with the worm.

According to the invention of claim 3, claim 1
Alternatively, in addition to the function of the invention described in claim 2, the assembly of the worm wheel into the housing is performed by assembling the output shaft supporting the worm wheel into the housing, and in this state, moving the worm wheel in the axial direction to form the worm. Complete by engaging them. Therefore, the worm wheel can be easily assembled to the housing, and the assembly can be easily automated.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment in which the present invention is embodied in a motor device with a reducer for a wiper device mounted on a vehicle will be described below with reference to FIGS.

As shown in FIG. 2, a motor device with a speed reducer (hereinafter, simply referred to as a motor device) 10 according to the present embodiment.
Is composed of a motor unit 11 and a speed reduction unit 12. Motor part 1
1 includes a yoke housing 13 having a substantially bottomed cylindrical shape, and a plurality of magnets 1 are provided on an inner peripheral surface of the yoke housing 13.
4 is fixed. A rotor 15 is arranged inside the yoke housing 13. On the other hand, the brush device 16 is provided on the speed reducer 12 side.

The rotor 15 is provided with a rotary shaft 17, and the rotary shaft 17 is provided with an armature 18 and a commutator 19. The base end of the rotary shaft 17 is supported by a bearing 20 fixed to the bottom side of the yoke housing 13. Armature 18
Is disposed inside the yoke housing 13 at a position facing the magnet 14, and the commutator 19 is disposed in the yoke housing 1.
It is supported on the outside of the yoke housing 13 by a rotary shaft 17 extending from the opening of the third housing 3.

As shown in FIGS. 1 and 2, the reduction gear unit 12 includes a reduction gear unit housing formed by a gear housing 22 and a housing cover 23. The reduction gear unit housing is provided with the tip end side of the rotary shaft 17 and is arranged. , Worm 24, gear body 25, planetary gear reducer 26, and output shaft 27 are provided. The reduction gear housing is integrated with the yoke housing 13. In this embodiment, the gear housing 22 and the housing cover 23 form a housing. The worm 24 and the gear body 25 form a worm gear reducer.

The gear housing 22 is a brush housing portion 2.
9, a worm accommodating portion 30, a wheel accommodating portion 31, a shaft supporting portion 32, and the like. The brush accommodating portion 29 is formed so as to open toward the yoke housing 13 side, and the brush device 16 is provided inside thereof.

The worm accommodating portion 30 is formed so that the rotating shaft 17 can be inserted from the brush accommodating portion 29, and the radial bearing 33 fixed to the inner peripheral surface of the worm accommodating portion 30 supports the intermediate portion of the rotating shaft 17. In the radial bearing 33, the outer ring fixed to the inner peripheral surface of the worm housing portion 30 supports the inner ring fixed to the intermediate portion of the rotating shaft 17. Further, the worm accommodating portion 30 accommodates the worm 24 formed on the tip side of the rotating shaft 17.

The wheel accommodating portion 31 is formed in a substantially cylindrical shape with a bottom, and its central axis L is in a direction orthogonal to the rotation axis of the rotation shaft 17. The wheel housing portion 31 has an opening 31a on one side in the central axis L direction and a bottom portion 31b on the other side. The worm accommodating portion 30 is provided on a part of the inner peripheral surface 31c of the wheel accommodating portion 31.
And a part of the worm 24 is connected to the wheel accommodating portion 31.
It is located inside. The gear housing 25, the planetary gear reducer 26, and the base end side of the output shaft 27 are arranged in the wheel housing portion 31.

As shown in FIG. 1, the shaft support portion 32 is formed in a substantially cylindrical shape and is provided so as to extend in the central axis L direction at the central portion of the bottom portion 31b of the wheel accommodating portion 31.
The shaft support portion 32 is provided such that one end portion thereof projects from the bottom portion 31 b of the wheel housing portion 31 and the other end portion thereof projects from the outer surface of the gear housing 22 to the outside. And
The shaft support portion 32 is provided with a shaft hole 32 a that connects the wheel housing portion 31 to the outside of the gear housing 22.

A pair of slide bearings 34 are fixed in the shaft hole 32a, and the output shaft 27 is rotatably supported by the gear housing 22 by the both slide bearings 34. The output shaft 27 has a shaft portion 2 supported by both slide bearings 34.
The fitting portion 27b is provided on the base end side of the shaft portion 27a.
A connecting portion 27c is provided on the tip side of a.

As shown in FIGS. 1 and 2, the gear body 25 is composed of a worm wheel portion 35 and a sun gear portion 36 having a diameter smaller than that of the worm wheel portion 35. In the present embodiment, the worm wheel portion 35 is a worm wheel and the sun gear portion 36 is a sun gear.

The worm wheel portion 35 includes the worm 24.
A tooth 37 that meshes with is provided on the entire circumference. Teeth 37
As shown in FIGS. 1 and 3, when the worm 24 rotates in the direction of arrow S, the worm wheel portion 35 is rotated in the direction of arrow T so that the inclination direction with respect to this rotation direction is on the left side in FIG. Is formed in. The worm wheel portion 35 provided in this manner includes the worm 2
When 4 rotates in the direction of arrow S, component force f1 in the direction of arrow U in the direction of the axis L is applied from the worm 24. This component force f
1 urges the gear body 25 in a direction in which the circular arc portion 38 of the worm wheel portion 35 is pressed against the teeth 24 a of the worm 24.

Further, each tooth 37 of the worm wheel portion 35
Is approximately half on one side in the axial direction of the gear body 25 (the side where the teeth mesh when the worm 24 rotates in the direction of the arrow S) is formed in an arc shape along the teeth 24a of the worm 24. It is an arc portion 38. Arc part 3
8 is formed so as to come into line contact with the teeth 24 a of the worm 24. The arc portion 38 is formed only on one half of one side in the axial direction in order to obtain the ease of assembling the gear body 25 at the time of manufacturing the motor device 10. That is, the output shaft 27 supporting the gear body 25 is assembled to the gear housing 22 to which the motor portion 11 is fixed, and in this state, the gear body 25 is moved in the direction of the arrow U in the direction of the axis L to mesh with the worm 24. This is so that it can be done.

As shown in FIG. 1, the sun gear portion 36 is a constituent element of the planetary gear reducer 26, and is provided with a helical spacer 36a. As shown in FIG. 4, each of the helical bars 36a is provided so that the inclination direction thereof is the right side with respect to the axis L in the rotational direction of the gear body 25 in the direction of the arrow T in FIG. That is, the helical bars 36a are provided so that the gear body 25 inclines in the direction opposite to the direction of arrow T in which the teeth 37 of the worm wheel portion 35 incline.

Further, as shown in FIG. 1, the gear body 25 is formed with a shaft hole 25a penetrating its center portion, and a concave portion 25b is formed on the end face of the sun gear portion 36 side.
The gear body 25 is rotatably supported by the output shaft 27 by loosely inserting the shaft portion 27a of the output shaft 27 into the shaft hole 25a.

As shown in FIGS. 1 and 2, the planetary gear reducer 26 includes a gear body 25 (sun gear portion 36), a planetary gear carrier (hereinafter, simply referred to as carrier) 40, and a planetary gear 41.
And an internal gear 42.

The sun gear portion 36 is rotatable relative to the output shaft 27 and rotates integrally with the worm wheel portion 35. As shown in FIGS. 1 and 2, the carrier 40 includes a substantially disc-shaped base portion 40a and three support shafts 40b (illustrated in FIG. 2) provided upright on the end surface of the base portion 40a. The carrier 40 is supported so as to be integrally rotatable with respect to the output shaft 27 by fitting and fixing the fitting portion 27b of the output shaft 27 into the shaft hole 40c provided at the center of the base portion 40a. And
The carrier 40 is provided outside the gear housing 22 on the output shaft 2
The disc spring 43 mounted on the tip side of the shaft 7 holds the output shaft 27 in the direction of the axis L so as not to retract from the worm gear reducer side. The gear body 25 is held between the carrier 40 and the shaft support portion 32. At this time, the gear body 2 is interposed between the carrier 40 and the shaft support portion 32.
5 so that the carrier 5 and the output shaft 27 are not pinched.
The disc spring 43 is fixed at a position that allows relative movement with respect to the gear housing 22 in the direction of the axis L by a slight amount. The washer 4 is provided between the shaft support 32 and the gear body 25.
4 is installed.

The planet gear 41, as shown in FIGS.
The three sun gear parts 36 of the gear body 25 are provided.
It is provided with a Hasba 41a that meshes with the Hasba 36a.
The planet gears 41 are rotatably supported by the support shafts 40b of the carrier 40 while being meshed with the sun gear portion 36. Then, each planetary gear 41 revolves around the sun gear portion 36 while rotating by the relative rotation of the gear body 25 with respect to the carrier 40.

As shown in FIGS. 1 and 2, the internal gear 42 is formed in a substantially cylindrical shape that fits in the wheel accommodating portion 31, and the inner peripheral surface of the internal gear 42 has a helical spacer 41a for each planet gear 41.
Has bar 42a that meshes with.

The sun gear portion 36 provided as described above,
Each tooth 36 of each planetary gear 41 and internal gear 42
The a, 41a, and 42a are provided such that the direction of the reaction force applied to the gear body 25 in the direction of the axis L is the direction in which the gear body 25 is moved to the bottom portion 31b side of the wheel housing portion 31.

More specifically, when the motor unit 11 is operated and the worm 24 is rotationally driven by the rotary shaft 17, the worm 24 drives the worm wheel unit 35 and the sun gear unit 36 drives each planet gear 41. At this time, as shown in FIG. 4, the sun gear portion 36 (gear body 25) having the helical bars 36a includes the planetary gears 41 having the helical bars 41a.
A reaction force f2 in the direction of the axis L is applied from. The direction of this reaction force f2 is in accordance with the inclination direction of the hasps 36a and 41a with respect to the rotation direction of the sun gear portion 36 (gear body 25). Further, the magnitude of the reaction force f2 is determined by the length of the hook bars 36a and 41a.
Changes according to the inclination angle of.

Here, as shown in FIG. 1, when the motor unit 11 is operated so that the rotary shaft 17 rotates about the arrow S, the axis L applied from each planetary gear 41 to the gear body 25.
The direction of the reaction force f2 is that the gear body 25 is moved to the wheel housing portion 3
The direction of inclination of each of the hook bars 36a, 41a, 42a is set so as to be displaced toward the bottom 31b of the No. 1 unit. As a result, the reaction force f2 in the direction of the axis L applied from each planetary gear 41 to the gear body 25 is reduced by the worm wheel portion 3
The gear body 25 is urged so that the circular arc portion 38 of 5 is pressed against the teeth 24 a of the worm 24.

As shown in FIG. 1, the housing cover 23 is fixed to the gear housing 22 so as to cover the opening 31a of the wheel accommodating portion 31. The motor device 10 configured as described above, as shown by an arrow S in FIG.
The operation of the motor unit 11 is controlled so that the rotation shaft 17 rotates in a direction in which the teeth of the worm 24 mesh with the worm wheel unit 35 from the side of the arc portion 38. And the output shaft 27
The crank arm fixed to the connecting portion 27c is rotationally driven in a predetermined direction, the link mechanism having the crank arm as a component is operated, and the wiper arm (not shown) is swung.

Next, the operation of the present embodiment configured as described above will be described. When the operation of the motor unit 11 is controlled, the worm 24 rotates together with the rotating shaft 17 around the arrow S, and the gear body 25 rotates around the arrow T at a smaller rotation speed. The gear body 25 causes the planetary gears 41 to rotate and revolve. Then, the output shaft 27 rotates together with the carrier 40 at a rotational speed smaller than that of the gear body 25. As a result, the rotation of the rotary shaft 17 of the motor unit 11 is
2 by worm gear reducer and planetary gear reducer 26
It is decelerated in stages and output from the output shaft 27. At this time, since each gear of the planetary gear reducer is a helical gear,
The meshing noise between gears is reduced.

Here, the component force f in the direction for urging the gear body 25 from the worm 24 to the worm wheel portion 35 so that the circular arc portion 38 is deeply meshed with the worm 24.
1 is added.

Further, from each planetary gear 41 to the sun gear portion 36.
Then, a reaction force f2 is applied to bias the gear body 25 so as to press the arc portion 38 against the teeth 24a of the worm 24.
Therefore, even if the gear body 25 is supported with play in the direction of the axis L, the lift of the gear body 25 with respect to the worm 24 from the worm 24 to the worm wheel portion 35 when the motor device 10 is loaded during operation. It is suppressed by the applied component force f1 and reaction force f2 in the direction of the axis L. Then, the meshing state of the worm 24 and the worm wheel portion 35 is prevented from becoming shallow, and the meshing state is maintained well.

According to this embodiment described in detail above, the following effects can be obtained. (1) In the load state during operation of the motor device 10,
The reaction force f2 in the direction of the axis L applied to the sun gear portion 36 from each planetary gear 41 causes the gear body 25 to move against the worm 24.
Of the worm wheel portion 35 and the worm 24 are kept in good mesh with each other. Therefore, since the teeth 24a and 37 are prevented from meshing with each other at the tooth tips, it is possible to suppress the strength reduction of the worm wheel portion 35 and the worm 24 due to the shallow meshing.

(2) Further, the component force f1 applied from the worm 24 to the worm wheel portion 35 in the direction of the axis L suppresses the worm wheel portion 35 (gear body 25) from rising up relative to the worm 24, and the worm wheel portion 35 and the worm wheel 35 The meshed state with 24 is maintained well. Therefore, for reasons such as a reduction in rotation transmission efficiency, the helical gears 36a and 41a of the sun gear unit 36 and the planetary gears 41 may be reduced.
When the inclination angle of 2 cannot be increased so much and the reaction force f2 in the direction of the axis L cannot be made sufficiently large, the reaction force f2 can be supplemented. Then, it is possible to suppress the strength reduction of the worm 24 and the worm wheel portion 35 without causing the reduction of the rotation transmission efficiency.

(3) Further, the direction of the reaction force f2 applied to the sun gear portion 36 from each planetary gear 41 in the direction of the axis L is such that the output shaft supporting the gear body 25 when the gear body 25 is assembled to the gear housing 22. 27 to gear housing 22
The gear body 25 is moved in the direction of the axis L in this state to engage with the worm 24. Similarly, from the worm 24 to the worm wheel portion 3
The direction of the component force f1 applied to the 5 in the direction of the axis L is also the same direction.

Therefore, the gear housing 2 of the gear body 25
2 is mounted on the output shaft 27 supporting the gear body 25.
Assembled to the gear housing 22, and in this state, the gear body 2
This is completed by moving 5 in the direction of the axis L and engaging the worm wheel portion 35 with the worm 24. As a result, the gear body 25 is easily assembled, and automation of the assembly is facilitated.

Next, embodiments other than the above-mentioned one embodiment will be listed. -In the above-mentioned one embodiment, as shown in Drawing 5, motor part 1
1 is driven in the opposite direction, and the output shaft 27 is rotationally driven in the same direction. Also in this configuration, the reaction force f2 applied from the planetary gears 41 to the sun gear portion 36 and the component force f1 applied from the worm 24 to the worm wheel portion 35 cause the gear body 25 against the worm 24 during operation of the motor device 10. Can be suppressed.

In the above-described embodiment, as shown in FIG. 6, the rotation direction of the worm 24 is the reverse direction indicated by the arrow V, and the inclination direction of the teeth of the worm 24 and the worm wheel portion 35 is the inclination direction with respect to the rotation direction. May be on the right side in FIG. In this case, only the direction of the reaction force f2 applied from the planetary gears 41 to the sun gear portion 36 is such that the arc portion 38 of the tooth 37 of the worm wheel portion 35 is deeply meshed with the tooth of the worm 24 so that the worm wheel portion 35 ( The gear body 25) is biased. Even with such a configuration, the effect (1) of the above-described embodiment can be obtained.

In the above-described embodiment, the worm wheel portion 35 is configured such that approximately half of one side of the wheel housing portion 31 on the bottom portion 31b side is the arc portion 38. That is, when the gear body 25 is assembled to the gear housing 22, only the gear body 25 is first placed in the wheel housing portion 31 and meshed with the worm 24, and the output shaft 27 is attached to the gear body 2.
5 and the gear housing 22. In this case, the axis L added from each planetary gear 41 to the sun gear portion 36
The direction of the reaction force f2 in the direction is such that the gear body 25 is biased so as to separate the gear body 25 from the bottom portion 31b of the wheel accommodating portion 31, so that the sun gear portion 36, the planetary gears 41, and the internal gear 42 have a helical force. The inclination directions of 36a, 41a, 42a may be set opposite to the inclination directions of the embodiment.

In the one embodiment, the internal gear may be an internal tooth portion formed integrally with the gear housing 22. In the one embodiment, the worm wheel and the sun gear may be separate members and may be integrated by fitting or the like.

In the above-described embodiment, the worm is not limited to the one provided on the rotary shaft 17 of the motor unit 11. The motor device embodying the present invention is not limited to a wiper, but may be a motor device for a power window, a power seat, a retractable headlight, or the like.

The technical idea understood from each of the above-described embodiments will be described below along with its effects. (1) A worm gear reducer, a planetary gear reducer, and an output shaft are provided in the housing, the worm is rotationally driven, the worm rotates a sun gear together with a worm wheel, and the sun gear cooperates with an internal gear. In the speed reducer in which the planetary gear rotates and revolves around the planetary gear and the planetary gear rotates the output shaft together with the gear carrier, the teeth of the worm wheel are substantially half along one side in the axial direction along the teeth of the worm. The sun gear and the planet gears are helical gears, and the direction of inclination of the helical gears of the sun gear and the planet gears is the direction in which the worm is driven to rotate in a predetermined rotation direction. The direction of the reaction force in the axial direction applied to the sun gear from the planetary gear presses the arc portion of the worm wheel tooth against the worm tooth. Reduction gear, characterized in that it is set to be a direction that urges the worm wheel so. According to such a configuration, in the reduction gear device in which the worm speed reducer and the planetary speed reducer are connected in two stages, even if the sun gear and the planetary gear are provided with a highly quiet silencer, the same axis line as the sun gear is used. It is possible to maintain a good meshing state between the worm wheel having an arc portion that integrally rotates with the worm.

(2) In the invention described in the above-mentioned technical idea (1), the inclination direction of the teeth of the worm and the worm wheel is an axis line added from the worm to the worm wheel when the worm is rotationally driven in the rotation direction. The direction of the component force in the direction is set so as to urge the worm wheel so as to press the circular arc portion against the teeth of the worm. With such a configuration, the meshed state of the worm and the worm wheel can be more favorably maintained in the loaded state during operation.

(3) The above technical idea (1) or (2)
In the invention as set forth in claim 1, the direction in which the worm wheel is biased is such that, when the worm wheel is assembled to the housing, the output shaft supporting the worm wheel is supported by the housing, and the worm wheel is axially moved in this state. A speed reducer characterized in that it is oriented when it is moved to and meshed with a worm. With such a configuration, the worm wheel can be easily assembled to the housing, and the assembly can be easily automated.

(4) The motor device with a speed reducer according to any one of claims 1 to 3 is a motor device for a wiper device of a vehicle. (5) A worm gear reducer, a planetary gear reducer, and an output shaft are provided in a housing provided with a motor unit, the motor unit rotates the worm, and the worm rotates a sun gear together with a worm wheel. In the motor device with a reduction gear, in which the gear cooperates with the internal gear to rotate and revolve the planetary gear, and the planetary gear rotates the output shaft together with the gear carrier, the sun gear, the planetary gear and the internal gear are A motor device with a speed reducer, which is a helical gear. With such a configuration, gear noise in the planetary gear reducer can be reduced, and noise in the motor device can be reduced.

[0053]

According to the invention described in claims 1 to 3, in a motor device having a speed reducer in which a worm speed reducer and a planetary speed reducer are connected in two stages, the sun gear and the planet gears are quiet. Even if an excellent Hasba is used, the meshing state between the worm wheel and the worm having the arc portion that integrally rotates with the sun gear on the same axis can be maintained well.

[Brief description of drawings]

FIG. 1 is a schematic vertical cross-sectional view of essential parts showing a motor device with a reducer according to an embodiment.

FIG. 2 is a schematic cross-sectional view taken along the line AA in FIG.

FIG. 3 is a schematic diagram showing a mesh portion of a worm and a worm wheel.

FIG. 4 is a schematic development view showing a state where the sun gear and the planet gear have meshed with each other.

FIG. 5 is a schematic vertical cross-sectional view of main parts showing a motor device according to another embodiment.

FIG. 6 is a schematic vertical sectional view of a main part of a motor device according to another embodiment.

FIG. 7 is a schematic vertical sectional view of an essential part showing a conventional motor device with a reducer.

[Explanation of symbols]

10 ... Motor device with reduction gear, 11 ... Motor part, 12 ...
Speed reducer, 22 ... gear housing as housing, 2
4 ... Worm forming worm gear reducer, 24a ...
Tooth, 25 ... Gear body, 26 ... Planetary gear reducer, 27 ... Output shaft, 35 ... Worm wheel portion as worm wheel constituting worm gear reducer, 36 ... Sun gear portion as sun gear, 36a ... Has bar, 37 ... Tooth, 38 ... Arc part, 40 ... Planetary gear carrier, 41 ... Planetary gear, 41
a ... hasba, 42 ... interle gear, 42a ... hasba,
f1 ... component force, f2 ... reaction force, L ... axis line.

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Claims (3)

[Claims] 1. A worm gear reducer, a planetary gear reducer, and an output shaft are provided in a housing provided with a motor unit, the motor unit rotates the worm, and the worm is provided coaxially with the worm wheel. A motor device with a reducer that rotates a sun gear integrally with a worm wheel, and this sun gear cooperates with an internal gear to rotate and revolve a planetary gear, and the planetary gear rotates the output shaft together with a gear carrier. In the tooth of the worm wheel, substantially half on one side in the axial direction is an arc portion formed in an arc shape along the tooth of the worm, the sun gear and the planet gear are helical gears, and The inclination direction of the gear and the pinion of the planet gear is such that when the motor rotates the worm in the specified rotation direction, Reaction force direction of the axial direction applied from Ya is,
A motor device with a reducer, which is set so as to urge the worm wheel so that the circular arc portion of the tooth of the worm wheel is pressed against the tooth of the worm. 2. The inclination direction of the teeth of the worm and the worm wheel is such that the direction of the axial component force applied from the worm to the worm wheel when the motor section rotates the worm in the rotation direction is the arc section. The worm wheel is biased so as to be pressed against the teeth of the worm, and the worm wheel is biased.
A motor device with a reducer according to. 3. The urging direction of the worm wheel is such that, when the worm wheel is assembled to the housing, the output shaft supporting the worm wheel is supported by the housing, and the worm wheel is axially moved in this state. The motor device with a speed reducer according to claim 1 or 2, wherein the direction is a direction in which the motor device is moved and meshed with the worm.