KR101673074B1

KR101673074B1 - Motor unit

Info

Publication number: KR101673074B1
Application number: KR1020150026315A
Authority: KR
Inventors: 다이스케 사카이
Original assignee: 니혼 덴산 산쿄 가부시키가이샤
Priority date: 2014-02-28
Filing date: 2015-02-25
Publication date: 2016-11-04
Also published as: CN204921856U; CN104879447A; KR20150102702A; JP2015163012A; WO2015129455A1

Abstract

Provided is a motor unit capable of preventing breakage and deformation of a worm even when a load applying means, which is a worm gear mechanism for giving a load to rotation of a gear train, is mounted on a case by a human hand.
A first bearing and a second bearing for rotatably supporting the worm portion, a frame portion connecting the first bearing and the second bearing, and a load imparting a brake portion for imparting resistance to rotation of the worm portion. The upper frame which is the upper end of the frame portion connects the first bearing and the second bearing above the support position of the worm portion so that the load when the operator grasps the load applying means with the finger is supported by the upper frame And the worm is prevented from being damaged or deformed.

Description

Motor unit {MOTOR UNIT}

The present invention relates to a motor unit, and more particularly, to a motor unit having a clutch means for interrupting and connecting transmission of motor power to a driven member.

The following patent document 1 discloses a transmission mechanism in which a first transmission train, which is a gear mechanism that transmits power of a motor to a driven member, and a second transmission train, in which the transmission of motor power by the first transmission train is "connected" Quot; state ") or a " cut-off " state (a state in which the power of the motor is not transmitted to the driven member by the transfer heat have.

The motor actuator 1 of Patent Document 1 shifts the state of " disconnected " and the state of " connected " of the clutch means by moving the driven gear 43 in the axial direction. The second toothed portion 431, which is the helical toothed portion of the driven gear 43, meshes with the first toothed portion 422, which is the helical toothed portion of the other gear, and the third toothed portion 432, which is the worm wheel, And is engaged with the fourth toothed portion 51 which is a worm.

The driven gear 43 is always pushed in the direction of turning the clutch means to the " off " state, and the thrust force generated from the engagement between the helical teeth and the load from the fourth tooth portion 51 To the other side in the axial direction to bring the clutch means into the " connected " state.

Japanese Unexamined Patent Application, First Publication No. H8-80757

Fig. 9 is a perspective view of the load applying means 50 'provided in the motor actuator of Patent Document 1 in Fig. 11 of Patent Document 1. The code shown in Fig. 9 is also shown in Fig. 11 of Patent Document 1.

The fourth toothed portion 51, which is a worm having the centrifugal braking mechanism, constitutes a part of the load applying means 50 '. Both end portions in the axial direction of the fourth toothed portion 51 are supported by bearings, and these bearings are connected via a frame portion. A load portion 52 is provided on one end of the fourth toothed portion 51 and a drum 83 is formed on the bearing on the side of the load portion 52. [ The centrifugal braking mechanism is realized by the fourth toothed portion 51, the load portion 52 and the drum 83.

When a unit including such a worm and a worm supporting member is built into a case with a human hand, an operator grips the opposite surface (hereinafter also referred to as " back surface ") of the worm supporting surface of these bearings with a finger, . In this case, it is natural that there is a variation in the force of holding the bearings by the operator, and it is expected that sudden excessive force may be applied. Therefore, when the rigidity of the worm support member is insufficient, if the bearing is held by a force of a certain level or more, the worm supports the force, which may cause damage or deformation of the worm.

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a motor unit capable of preventing breakage and deformation of a worm portion even when the load applying means is provided with a human hand.

In order to solve the above problems, a motor unit of the present invention comprises: a first transmission train having a motor rotating in one direction and one or a plurality of power transmitting members for transmitting the power of the motor to a driven member; CLAIMS What is claimed is: 1. A transmission device comprising: clutch means for switching transmission of power by heat to a " connected " state or " blocked "state; and a transmission train for transmitting the power of said motor to said clutch means, A second transmission line having a second gear formed with a second helical tooth portion engaged with a toothed portion and a load applying means for applying a load to rotation of the second gear, And is always pushed in the direction of one of the axial direction and the clutch means in the " blocking " state, and is engaged with the first gear, And the clutch unit is moved to the other side in the axial direction against the urging force by a thrust force generated by receiving a load from the first gear, A worm wheel portion is formed, and the load applying means includes a worm portion engaged with the worm wheel portion, a first bearing and a second bearing that rotatably support the worm portion, and a second bearing that connects the first bearing and the second bearing Wherein the upper frame which is the upper end of the frame portion is provided with a frame portion and a brake portion for giving resistance to rotation of the worm portion with the joint surface side to the case half of the load applying means being downward, And the first bearing and the second bearing are connected to each other.

When the load applying means is incorporated in the case half, it is assumed that relatively upper portions of the first bearing and the second bearing (hereinafter, also referred to as " bearings " Therefore, by providing the upper frame, which is the upper end of the frame portion, above the worm portion, and by connecting the first bearing and the second bearing in this upper frame, most of the force for holding the bearings is supported by the upper frame, The load can be reduced.

Preferably, the frame portion connects the first bearing and the second bearing by the lower frame, which is an opposite end portion of the upper frame and the upper frame. In this case, the upper frame may be formed so as to connect the first bearing and the second bearing in parallel with the worm portion at a position above the worm portion, and the lower frame may be provided at a lower position with respect to the worm portion, And the first bearing and the second bearing may be connected to each other in parallel with the worm portion. Since the bearings are supported at both the upper and lower ends of the frame portion, the shaking when the bearings are sandwiched by the fingers is reduced, so that the frame portion can stably support the bearings and the efficiency of the installation work can be improved.

At least one of the first bearing and the second bearing is formed separately from the frame portion, and a joint surface of the upper frame and the lower frame, which is formed with the separately formed bearing, The convex portion projecting to the bearing side is formed and the convex portion is fitted to the concave portion formed in the bearing formed by the separate body so that the frame portion and the separately formed bearing are connected to each other, It is possible to facilitate the installation of the worm portion on the wrist portion. Specifically, the frame portion is integrally formed with the second bearing, and a drum for storing the brake portion is formed in the first bearing. On the joint surface between the upper frame and the first bearing of the lower frame, A convex portion protruding toward the first bearing is formed, and the convex portion is fitted to the concave portion formed on the first bearing side, so that the frame portion and the first bearing are connected to each other.

In addition, since the frame portion has a reinforcing portion between the upper frame and the lower frame, and the reinforcing portion is provided with the recess or the through hole, the rigidity of the frame portion can be increased and the occurrence of the recess can be prevented , It is possible to form the frame portion linearly without deformation. Specifically, the reinforcing portion may include the through hole so as to reinforce the upper frame and the lower frame in a brace shape.

In addition, the wing portion side surface of at least one of the frame portion, the first bearing, and the second bearing is provided with a rib portion for preventing the first bearing or the second bearing from tilting toward the worm portion, It is possible to further reduce the load on the worm portion due to the nipping of the bearing.

Further, since the grasping portion formed in a plane is formed on the opposite side surface of at least one of the first bearings and the second bearings to support the worm portion, it is easy to hold the bearings with fingers and is installed efficiently with a light force So that it is possible to further reduce the force applied to the worm portion.

In addition, at least one of the first bearing and the second bearing is provided with a fitting portion, which is one or a plurality of convex portions protruding toward the case half, on at least one of the joint surfaces of the first bearing and the second bearing, Wherein the introduction portion is formed with a convex portion whose diameter is reduced at right angles to the axial direction or a convex portion whose axial length is longer than the root portion and whose diameter is reduced toward the case half body, The positioning to the case half can be facilitated and the force applied to the worm part can be further reduced because it can be press-fitted with a small pushing force. Specifically, a plurality of protrusions, which are convex portions protruding toward the case half body, are formed on the surfaces of the first bearing and the second bearing which are in contact with the case half, and the front ends of the plurality of fitting portions In this case, the plurality of engaging portions provided on the first bearing and the plurality of engaging portions provided on the second bearing are formed so as to be perpendicular to the axial direction of the worm portion The mounting on the case half is also stabilized.

According to the motor unit of the present invention, it is possible to prevent breakage and deformation of the worm portion even when the load applying means is provided with a human hand.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view showing a whole of a motor unit according to the present embodiment (a state in which a case is removed). Fig.
2 is a systematic view for explaining a power system of a motor unit according to the present embodiment;
3 is an explanatory diagram of a gear mechanism for transmitting motor power to a driven member;
4 is a front view showing a coupling mechanism of two rotor gears;
5 is an exploded perspective view of a differential gear mechanism which is a clutch means;
6 is a plan view showing a member constituting a shift means;
7 is a front view showing a pushing mechanism of the second gear and the lock lever;
8 is a perspective view showing a bottom surface of the fan-shaped lever.
9 is a perspective view of a load applying means of Patent Document 1. Fig.
10 is a perspective view (a) and an exploded view (b) of a load applying means according to the present embodiment.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following description, the upper and lower portions indicate the upper and lower portions in Fig. The " home position " refers to the position of each component in a state in which the motor 10 is not driven.

Before describing each configuration of the motor unit 1 according to the present embodiment, the outline of the motor unit 1 will be briefly described with reference to the flowchart of Fig. 2, the power system of the motor unit 1 includes an output system (first transmission heat) for transmitting the power of the motor 10 to the driven member 90, And a clutch operating system (second transmission heat). The clutch means 30 switches the transmission of power by the output system to a " connected " state or a " blocked " state. That is, if the clutch means 30 is in the " connected " state, the power of the motor 10 is transmitted to the driven member 90 through the output system. If the clutch means 30 is in the "blocked" state, the output system is shut off and the power of the motor 10 is not transmitted to the driven member 90. As shown in the drawing, in this embodiment, the driven member 90 is operated as the power of the clutch operating system for operating the clutch means 30 (to transmit the power by the first transfer heat to the "connected" state) A part of the power of the motor 10 for driving the motor 10 is used.

(Load applying means)

The configuration of the load applying means 50 in this embodiment will be described in detail with reference to Fig.

The load applying means 50 in this embodiment includes a worm portion 51 which is engaged with a driven tooth portion 442 which is a worm wheel portion of a second gear 44 to be described later, A frame portion 55 connecting the first bearing 53 and the second bearing 54 to each other and a second bearing 54 connecting the first bearing 53 and the second bearing 54 to each other to provide resistance to the rotation of the worm portion 51 And has a centrifugal brake-in load portion 52.

The frame portion 55 is integrally formed with the second bearing 54 and is formed separately from the first bearing 53. [ A drum 531 for storing the load section 52 is formed in the first bearing 53. The upper frame 551 which is the upper end of the frame portion 55 is located above the worm portion 51 and is formed so as to be parallel to the worm portion 51 at a position above the worm portion 51, Two bearings 54 are connected. A convex portion 5511 and a convex portion 5521 protruding toward the first bearing 53 are formed on the joining surface of the upper frame 551 and the lower frame 552 at the opposite side end thereof to the first bearing 53 And the frame portion 55 and the first bearing 53 are connected to each other by fitting the convex portions to the concave portion 532 and the concave portion 533 formed on the first bearing 53 side. The lower frame 552 is formed to connect the first bearing 53 and the second bearing 54 in parallel with the worm portion 51 at a position below the worm portion 51. [ The upper frame 551 and the lower frame 552 are configured so that the first bearings 53 and the second bearings 54 are connected to the worm portion 51 and the side where the worm wheel portion of the second gear 44 is disposed The other side is connected. Here, the clearance between the concave portion 532 and the concave portion 533 is filled to narrow the movable region of the first bearing 53 connected to the frame portion 55 and to move toward the worm portion 51 side of the first bearing 53 It is possible to increase the rigidity against the tilting of the tilting mechanism.

The frame portion 55 has a reinforcing portion 553 between the upper frame 551 and the lower frame 552 and the reinforcing portion 553 is formed in a brace shape with a through hole 5531 formed therein. By forming the reinforcing portion 553 in a brace shape, it is possible to prevent the occurrence of depression while maintaining the rigidity of the frame portion 55 with respect to the load added from the up and down direction and the axial direction of the worm portion 51, Thereby enabling molding. However, the reinforcing portion 553 does not necessarily have to be in the form of a brace, but it is sufficient that a concave portion or a through hole is formed so as to prevent depression.

A rib portion 57 for preventing the second bearing 54 from tilting toward the worm portion 51 is formed on the side of the worm portion 51 of the frame portion 55 and the second bearing 54. [ These ribs may be formed at positions where the first bearings 53 are prevented from tilting toward the worm portions 51, or may be formed at both sides.

On the back surface of the second bearing 54, a grasping portion 541 formed in a plane is formed so that the worker can stably hold the load applying member 50 with a light force. Further, the rear surface of the first bearing 53 is substantially flat on its entire surface.

A plurality of fitting portions 56 which are convex portions protruding toward the lower case 82 as a case half are provided on the bottom surfaces of the first bearing 53 and the second bearing 54, The introduction portion has a convex portion whose diameter is reduced at right angles to the axial direction, or a convex portion whose axial length is longer than the root portion and whose diameter is smaller toward the lower case 82 side than the root portion. The positioning of the load applying member 50 in the lower case 82 is facilitated, and it is possible to press-fit the load applying member 50 with a small pressing force. A plurality of engaging portions 56 are provided on the bottom surfaces of the first bearing 53 and the second bearing 54 and a plurality of engaging portions 56 provided on the bottom surface of the first bearing 53, Since the plurality of fitting portions 56 provided on the bottom surface of the bearing 54 are arranged in the direction orthogonal to the axial direction of the worm portion 51, the load bearing member 50, together with the second bearing 54, Can be installed in the lower case 82 in a stable state.

The load applying means 50 according to the present embodiment has the above respective constitutions so that the load applied to the first bearing 53 and the second bearing (not shown) when the operator applies the load applying means 50 to the lower case 82 54 to the worm portion 51 to prevent the worm portion 51 from being damaged or deformed.

(Motor 10)

The motor 10 that drives the driven member 90 is an AC synchronous motor. It is also possible to apply a motor other than the AC synchronous motor. The motor 10 has a rotation axis projecting from its upper end face.

(First transfer column)

Hereinafter, the first transfer column will be described in detail with reference to Figs. 3 to 5. Fig. The first transmission line constitutes an output system for transmitting the power of the synchronous motor 10 to the driven member 90. The first transmission train includes a second rotor gear 21, an input side gear 22 meshing with the second rotor gear 21, and an input side gear 22 meshing with the rotation of the input side gear 22 when the clutch means is in the & A cam gear 25 meshing with the compound gear 24 and a cam gear 25 integrally formed with the cam gear 25 so as to be rotatable with the cam gear 25, And a wire 27 wound around the pulley 26 by the rotation of the pulley 26. The pulley 26 is rotated by the rotation of the pulley 26, The input side gear 22 and the output side gear 23 are also gears that constitute the clutch means (a differential gear mechanism based on the planetary gear train) in detail.

The second rotor gear 21 is a spur gear supported on the coaxial line with the synchronous motor 10 so as to be movable in the axial direction and includes a first rotor gear 41 integrally rotating with the rotor 11, (On the tip side of the rotation shaft). Further, the second rotor gear 21 is urged upward by the coil spring 28 in the axial direction. When the second rotor gear 21 is located on the rotor 11 side (lower side), the lower rotor gear 21 is engaged with the lower engaging portion 412 of the first rotor gear 41 An upper engaging portion 212 is formed. The position of the second rotor gear 21 when the lower engaging portion 412 and the upper engaging portion 212 are engaged is referred to as a first position. The position of the second rotor gear 21 in the state where the lower engaging portion 412 and the upper engaging portion 212 are not engaged is referred to as a second position.

The second rotor gear 21 is moved toward the rotor 11 side by the inclined cam 63 (see Fig. 8) of the fan-shaped lever 60 to be described later and the upper engaging portion 212 and the lower engaging portion 412 of the first rotor gear 41 are engaged with each other (the second rotor gear 21 is in the first position), the second rotor gear 21 and the first rotor The gear 41 rotates integrally. That is, the power of the synchronous motor 10 is also transmitted to the second rotor gear 21.

The input side gear 22 is engaged with the second rotor gear 21. The input side gear 22 is a gear constituting the planetary gear train. The input side gear 22 has a large-diameter toothed portion 221 having a relatively large diameter and a small-diameter toothed portion 222, which is a so-called sun gear, relatively small in diameter. The large diameter tooth portion 221 of the input side gear 22 is engaged with the second rotor gear 21 and the input side gear 22 rotates with the rotation of the second rotor gear 21. On the upper surface of the input side gear 22, there is formed a pyrokle protrusion 223. The input side gear lock projection 62 of the fan-shaped lever 60, which will be described later, acts on the pilot projections 223.

The power of the synchronous motor 10 is transmitted to the output side gear 23 through the second rotor gear 21. The output side gear 23 in this embodiment corresponds to the three planetary gears 231 and the planetary gears 232, which are the gears constituting the planetary gear train. Planetary gears 231 are rotatably supported on three planetary gear support shafts which are projected from the upper end surface of the planetary gears 232 and are equally spaced in the circumferential direction. A stop ring 233 is fixed to the upper end of the planetary gear support shaft to prevent the planetary gear 231 from falling off. The planetary gear 232 has a gear portion 2321 on the side opposite to the side where the planetary gear 231 is provided. The planetary gear 231 is engaged with the small diameter tooth portion 222 of the input side gear 22. When the clutch means is in the "connected" state, the planetary gear 231 revolves around the small-diameter toothed portion 222 of the input side gear 22 in accordance with the rotation of the input side gear 22 . With the revolution of the planetary gear 231, the planetary gear 232 supporting the planetary gear 231 rotates. In this way, power is transmitted from the input side gear 22 to the output side gear 23.

The compound gear 24 is engaged with the planetary support gear 232 (output side gear 23). The composite gear 24 has a relatively small diameter small diameter saw tooth portion 241 and a relatively large diameter large diameter saw tooth portion 242. The large diameter saw tooth portion 242 is engaged with the gear 2321, respectively. Thus, the composite gear 24 rotates as the planetary gear 232 rotates.

In the composite gear 24, the cam gear 25 is engaged. The gear portion 251 of the cam gear 25 is engaged with the small diameter tooth portion 241 of the composite gear 24. As a result, the cam gear 25 rotates with the rotation of the compound gear 24. A cam groove 252 is formed on the upper end surface of the portion where the gear portion 251 is formed on the outer periphery. The cam groove 252 is engaged with a fan-shaped lever 60 to be described later. The configuration and function of the lever-type lever 60 will be described later.

To the cam gear 25, a pulley 26 is fixed. If the pulley 26 is rotated integrally with the cam gear 25, the method of fixing the pulley 26 is not particularly limited. Thereby, the pulley 26 rotates with the rotation of the cam gear 25. Further, the pulley 26 is exposed to the outside of the case. A wire groove 261 is formed on the outer periphery of the pulley 26. [

One end of the wire 27 is fixed to the pulley 26. The method of fixing the wire 27 is not particularly limited as long as it can reliably prevent the wire 27 from falling off. When the pulley 26 rotates in the direction in which the wire 27 is drawn in, the wire 27 is rolled up so as to fit into the wire groove 261 of the pulley 26. The driven member 90 (for example, a valve member for opening and closing a drain port) is fixed to the other end side of the wire 27, and the driven member 90 is always returned to its home position (position where the valve member is closed) That is, a direction in which the wire 27 is drawn out. The wire 27 is wound around the pulley 26, so that the driven member 90 performs a predetermined operation. That is, the power of the synchronous motor 10 is transmitted to the driven member 90 through the first transfer heat by the wire 27 being wound around the pulley 26. Further, in order to operate the driven member 90 accurately, the wire 27 is formed of a material having no elasticity.

(Clutch means)

Hereinafter, the clutch means will be described in detail with reference to Fig. The clutch means serves to convert the transmission of power (output system) by the first transfer heat to the " connected " state or the " blocked " state. The operation of the clutch means in the present embodiment is the same as that of the first embodiment except that the input side gear 22 (small diameter tooth portion 222 as the sun gear), the output side gear 23 (the planetary gear 231 and the planetary gear 232) And a differential gear mechanism based on a planetary gear train having a fixed gear 31 (ring gear).

The input side gear 22 engages with the second rotor gear 21 and rotates as the second rotor gear 21 rotates. Three planetary gears 231 arranged at equal intervals in the circumferential direction are engaged with the small diameter tooth portions 222 of the input side gear 22. The planetary gear 231 is supported on the planetary support gear 232. The planetary gear 232 rotates as the planetary gear 231 revolves.

The fixed gear 31, which is a ring gear constituting the planetary gear train, has an outer tooth portion 311 and an inner tooth portion 312. The outer tooth portion 311 of the fixed gear 31 is located below the large diameter tooth portion 221 of the input side gear 22 and includes a lock gear 47 as one gear constituting a second transmission train Are engaged. That is, when the rotation of the lock gear 47 is blocked, the rotation of the fixed gear 31 is stopped. The internal teeth 312 of the fixed gear 31 are engaged with the three planetary gears 231.

Whether or not the planetary gear 231 rotates and the planetary gear 232 rotates is determined depending on whether or not the rotation of the stationary gear 31 is blocked in the clutch means having such a configuration. When the input gear 22 rotates, the inner teeth 312 of the fixed gear 31 do not move. Therefore, when the rotation of the fixed gear 31 is blocked, The planetary gear 231 engaging with the small diameter tooth portion 222 of the gear 22 is revolved and the planetary gear 232 is rotated. On the other hand, when the rotation of the fixed gear 31 is not blocked, the input gear 22 rotates and the planetary gear 231 tries to revolve, ) Does not rotate.

That is, when the rotation of the fixed gear 31 is blocked, the first transmission column is in the " connected " state and the rotation of the fixed gear 31 is not blocked, . The power of the synchronous motor 10 is transmitted to the driven member 90 through the first transmission train when the first transmission column is in the " connected " state, i.e., the output system is in the " connected " On the other hand, when the first transmission train is in the "blocking" state, that is, the output system is in the "blocking" state, the power of the synchronous motor 10 is cut by the clutch means (the input side gear 22 and the output side gear 23), and is not transmitted to the driven member 90.

(Second transfer column)

Hereinafter, the second transfer column will be described in detail with reference to FIGS. 6 and 7. FIG. The second transmission line constitutes a clutch operation system for transmitting the power of the synchronous motor 10 to the clutch means. The second transmission train includes a first rotor gear 41, a first gear 42 meshing with the first rotor gear 41, a second gear 44 meshing with the first gear 42, A lock lever 45 that is depressed when the second gear 44 moves downward in the axial direction and a lock gear 47 that is locked by the depressed lock lever 45.

The first rotor gear 41 is a spur gear integrally formed with the rotor 11 of the synchronous motor 10. [ (On the main body side of the synchronous motor 10) of the second rotor gear 21 described above.

The first gear 42 is engaged with the first rotor gear 41. Side gear teeth portion 421 and a first helical tooth portion 422 having a smaller diameter than that of the driving-side gear teeth portion 421. The first helical tooth portion 422 is a portion formed in the " helical tooth " as described above. The first gear 42 is meshed with the first rotor gear 41 of the drive side tooth portion 421 thereof. Therefore, the first gear 42 rotates as the first rotor gear 41 rotates.

The second gear 44 is engaged with the first gear 42. The second gear 44 has a second helical tooth portion 441 having a relatively large diameter and a driven tooth portion 442 having a relatively small diameter. The second gear 44 is rotatably and axially movably supported by the second gear support shaft 86. As described above, the second helical tooth portion 441 is a portion formed in the " helical tooth ". The driven side tooth portion 442 is a so-called worm wheel portion engaged with the worm portion 51 of the load applying means 50. Further, the driven-side tooth portion 442 may be a helical tooth or a flat gear.

The second gear 44 has its second helical tooth portion 441 engaged with the first helical tooth portion 422 of the first gear 42. Therefore, the second gear 44 rotates as the first gear 42 rotates. When the synchronous motor 10 is rotated forward, the second gear 44 is subjected to a load in a direction opposite to the rotational direction thereof by the load applying means 50, so that a downward thrust force is generated in the axial direction. Therefore, when the first gear 42 rotates, the second gear 44 moves downward in the axial direction while rotating.

The lock lever 45 is a plate-like member and is disposed below the second gear 44. More specifically, the second gear support shaft 86 is supported by the same second gear support shaft 86 in a state of being movable in the axial direction. The lock lever 45 is provided with a recess 452. The recess 452 is engaged with a not shown projection formed along the axial direction on the inner side of the side wall of the lower case 82. [ The lock lever 45 is supported on the second gear support shaft 86 in a state in which rotation is prevented and the lock lever 45 is movable in the axial direction by engaging the convex portion with the recess 452. [ At one end portion of the lock lever 45, a lock portion 451 formed to be thicker than the other portion is formed. Under the lock lever 45, a pushing member 46 (coil spring) for pushing the lock lever 45 upward is disposed. The lock lever 45 is positioned above the locked portion 471 of the lock gear 47 by the pushing member 46 when the lock lever 45 is normally operated (when the synchronous motor 10 is not driven). Since the second gear 44 is disposed on the lock lever 45, the second gear 44 is also pressed upward in the axial direction. The pushing force of the pushing member 46 is lower than the drag force in the axial direction downward generated in the second gear 44 when the second gear 44 rotates with the rotation of the first gear 42 small. That is, when the second gear 44 rotates, the second gear 44 moves downward in the axial direction against the pushing force of the pushing member 46. When the second gear 44 moves downward in the axial direction, the lock lever 45 under the second gear 44 also moves downward. The lock portion 451 of the lock lever 45 moved downward is located at approximately the same height as the locked portion 471 of the lock gear 47. [

The lock gear 47 has a lock portion 471 and a flat lock tooth portion 472 formed with the lock portion 471. The pinion 471 is formed to protrude outward from the circular flat plate. Since the lock portion 451 of the lock lever 45 and the locked portion 471 of the lock gear 47 are opposed to each other when the lock lever 45 is moved downward, (A position where the lock portion 451 and the contact portion 471 contact each other). On the other hand, the lock tooth portion 472 is engaged with the outer tooth portion 311 of the fixed gear 31 constituting the clutch means. Therefore, when the rotation of the lock gear 47 is stopped, the rotation of the fixed gear 31 engaged with the lock gear 47 is also prevented. Further, in this embodiment, the lock gear 47 has a brake portion 473 which is a centrifugal brake. The brake portion 473 applies a load in a direction that hinders the rotation of the lock gear 47, so that the lock gear 47 does not rotate at a higher speed than necessary. The operation of the brake portion 473 will be described later.

The worm portion 51 extending in a direction orthogonal to the axial direction of the second gear 44 is engaged with the driven tooth portion 442 (worm wheel portion). The driven side tooth portion 442 and the worm portion 51 constitute a speed increasing gear mechanism (when the driven side tooth portion 442 rotates by one tooth, the worm portion 51 makes one revolution ). Therefore, the rotation of the second gear 44 is increased and transmitted to the worm portion 51.

(Other configurations)

As shown in Figs. 1 and 8, a fan-shaped lever 60 is disposed on the composite gear 24. The lever-type lever 60 is rotatably supported on the same shaft as the shaft on which the compound gear 24 is rotatably supported. A latching protrusion 61 is formed on the lower surface of the fan-shaped lever 60. The engaging projection 61 is engaged with the cam groove 252 formed on the upper surface of the cam gear 25. Likewise, the fan-shaped lever 60 is provided with the input side gear lock projection 62 and the inclined cam 63. Details of the engagement projection 61, the cam groove 252, the input side gear lock projection 62, and the inclined cam 63 are omitted, but the functions of the respective members are as follows. When the cam gear 25 rotates in the direction of winding up the wire 27, the fan-shaped lever 60 is rotated toward the input side gear 22 by the engagement protrusion 61 engaging with the cam groove 252 . The input gear lock protrusion 62 is engaged with the input gear 22 so as to stop the drawing of the wire 27 when the fan-shaped lever 60 is moved to a predetermined position (the wire 27 is wound up to a predetermined position) Acts on the pyrochlore 223 to stop the rotation of the input side gear 22. At the same time, the second rotor gear 21 which has been pushed downward in the axial direction by the inclined cams 63 is released and moved upward in the axial direction by the coil springs 28 (the second rotor gear 21 is moved to the second (See FIG. 4). As a result, the engaging engagement between the upper engaging portion 212 of the second rotor gear 21 and the lower engaging portion 412 of the first rotor gear 41 is released. That is, the power of the synchronous motor 10 is not transmitted to the second rotor gear 21.

(Operation of the motor unit)

The normal operation of the motor unit 1 having the above configuration will be described in detail below. 1) power transmission operation for transmitting the power of the synchronous motor 10 to the driven member 90 at the home position and power transmission of the synchronous motor 10 are cut off so that the driven member 90 is returned to the original position And 2) a power cut-off operation.

1) Power transmission operation

(The state in which the wire 27 is not wound up on the pulley 26, that is, the state in which the power of the synchronous motor 10 does not act on the driven member 90) The second rotor gear 21 and the first rotor gear 41 rotate when the motor 10 is driven to one side (forward rotation). At this time, when the synchronous motor 10 rotates in the reverse direction, a reverse rotation prevention mechanism (not shown) acts, and the synchronous motor 10 immediately turns forward. When the synchronous motor 10 is driven, the rotation of the first rotor gear 41 rotates the first gear 42 having the drive-side tooth portions 421 engaged with the first rotor gear 41 .

When the first gear 42 rotates, the second gear 44 having the second helical tooth portion 441 engaged with the first helical tooth portion 422 of the first gear 42 rotates. The worm portion 51 of the load applying means 50 is engaged with the driven tooth portion 442 (worm wheel portion) of the second gear 44. The second gear 44 is rotated The load 52 of the means 50 also rotates. When the load portion 52 rotates and its speed increases, a load (torque) is generated in a direction to stop the rotation. This load is transmitted from the worm portion 51 to the second gear 44 having the driven side tooth portion 442 and to the first gear 42 engaged thereto. In this manner, the first gear 42 and the second gear 44 are subjected to a load opposite to the rotational direction thereof.

As described above, the transmission of power between the first gear 42 and the second gear 44 is caused by engagement of " helical teeth ". Therefore, the second gear 44, which receives the load opposite to the rotational direction from the load applying means 50, receives the downward thrust force in the axial direction by the rotation of the first gear 42. In other words, the second gear 44 moves downward in the axial direction while being rotated by a load opposite to the meshing and rotating direction of the " helical tooth ".

In this embodiment, since the engagement of the second gear 44 with the load applying means 50 is also based on the " helical tooth ", a drag force in a large axial direction downward with respect to the second gear 44 is generated do. That is, since the load generated by the load section 52 is transmitted to the second gear 44 by the meshing of the worm portion 51 and the driven tooth portion 442, Is generated in the second gear 44 as well.

When the second gear 44 moves downward in the axial direction, the lock lever 45 disposed under the second gear 44 moves downward in the axial direction against the urging force of the pushing member 46. When the lock lever 45 is depressed in this manner, the lock portion 451 provided on the lock lever 45 is located at the substantially same height as the locked portion 471 of the lock gear 47, As shown in Fig. Therefore, when this state is established, the rotation of the lock gear 47 is inhibited by the lock portion 451 of the lock lever 45. That is, the rotation of the lock gear 47 is stopped.

The lock gear 47 has its lock tooth portion 472 engaged with the outer tooth portion 311 of the fixed gear 31 constituting the planetary gear train of the clutch means. Therefore, when the rotation of the lock gear 47 is stopped, rotation of the fixed gear 31 is also prevented. Thereby, the transmission of the power by the first transfer heat is brought into the "connected" state by the clutch means, and the power of the synchronous motor 10 becomes the state of being able to be transmitted to the driven member 90 through the first transfer heat. As such, the second gear 44 moves downward in its axial direction, thereby bringing the transmission of power by the first transmission heat through the clutch means into the " connected " state.

On the other hand, the second rotor gear 21, which rotates together with the first rotor gear 41 by driving the synchronous motor 10, is meshed with the large-diameter gear portion 221 of the input side gear 22 constituting the planetary gear train Are engaged. Therefore, as the second rotor gear 21 rotates, the input side gear 22 rotates.

Three planetary gears 231 constituting the output side gear 23 are engaged with the outside of the small diameter toothed portion 222 of the input side gear 22. The inner teeth 312 of the fixed gear 31 are engaged with the outer side of the planetary gears 231 arranged at equal intervals in the circumferential direction. As described above, the fixed gear 31 is in a state of being prevented from being rotated by the lock gear 47. Therefore, when the input side gear 22 rotates, the planetary gear 231 revolves around the small diameter toothed portion 222. When the planetary gear 231 revolves, the planetary gear 232 for supporting the planetary gear 231 rotates. That is, the rotational power of the input side gear 22 is all transmitted to the output side gear 23.

When the input side gear 22 rotates when the rotation of the fixed gear 31 is not blocked, the fixed gear 31 is idle through the planetary gear 231. [ Since the power transmission train after the planetary support gear 232 has a portion of the transmission heat itself and a load applied to the driven member 90 so that the rotational power of the input side gear 22 is all transmitted to the fixed gear 31 side As shown in FIG. As described above, in the present embodiment, the " connected " state and the " blocked " state of the first transmission line by the clutch means are switched by the differential gear mechanism using the planetary gear train.

Diameter gear portion 242 of the compound gear 24 is engaged with the gear portion 2321 of the planetary gear 232. [ Therefore, with rotation of the planetary gear 232, the compound gear 24 rotates.

The gear portion 251 of the cam gear 25 is engaged with the small diameter tooth portion 241 of the compound gear 24. Therefore, as the composite gear 24 rotates, the cam gear 25 rotates.

When the cam gear 25 rotates, the pulley 26 fixed to the upper end of the cam gear 25 rotates. When the pulley 26 rotates, the wire 27 fixed to the pulley 26 is rolled up along the wire groove 261. Since the driven member 90 is fixed to the distal end of the wire 27, the driven member 90 is operated so as to be pulled up by the wire 27. For example, when the driven member 90 is a valve that opens and closes the drain port of the washing machine, the valve body is pulled up by the wire 27 to open the drain port and drainage is started.

Thus, the rotational power of the synchronous motor 10 is transmitted to the driven member 90 through the first transmission train. The first transmission train is brought into the "connected" state by the clutch means, but a part of the rotational power of the synchronous motor 10 is also used for the power for bringing the clutch means into the "connected" state.

Further, the winding of the wire 27 by the pulley 26 stops as follows. When the cam gear 25 is rotated to a predetermined position (when the wire 27 is wound a predetermined amount), the fan-shaped lever 60 having the engaging projection 61 engaging with the cam groove 252 engages with the input gear (22). When the fan-shaped lever 60 rotates in this manner, the input side gear lock projection 62 of the fan-shaped lever 60 comes into contact with the pilot projections 223 of the input side gear 22 from the circumferential direction. As a result, the rotation of the input side gear 22 is blocked. The second rotor gear 21 which has been pushed downward in the axial direction by the inclined cams 63 of the fan-shaped lever 60 is released and moved upward in the axial direction by the coil springs (the second rotor gear 21 ) Is located at the second position. As a result, the engaging engagement between the upper engaging portion 212 of the second rotor gear 21 and the lower engaging portion 412 of the first rotor gear 41 is released, 2 rotor gear 21 as shown in Fig. When the rotation of the input side gear 22 is stopped, the operation of the members constituting the first transmission line also stops. That is, in the state where the winding of the wire 27 by the pulley 26 is stopped and the pulley 26 is held at the retracted position (when the driven member 90 is a valve for opening and closing the drain port of the washing machine, Is maintained). As described above, the synchronous motor 10 continues to be driven while the opening of the drain hole is maintained, but the power is not transmitted to the second rotor gear 21 (first transmission heat). Therefore, the load applied to the synchronous motor 10 is small, and the power consumption can be reduced.

In this way, the power transmitting operation for transmitting the power of the synchronous motor 10 to the driven member 90 is completed.

2) Power cut-off operation

When the driven member 90 is returned to its original position from the state where the power transmission operation is completed, the driving of the synchronous motor 10 is stopped (the energization to the synchronous motor 10 is stopped). In this case, since the rotation of the first rotor gear 41 and the first gear 42 is stopped, the rotation of the second gear 44 is also stopped. When the rotation of the second gear 44 is stopped, the downward drag force on the second gear 44 caused by the engagement of the " helical tooth " do. Since the second gear 44 is pushed upwardly in the axial direction by the pushing member 46 together with the lock lever 45 disposed below the second gear 44, Moves upward in the axial direction while rotating, and returns to the home position. Naturally, the lock lever 45 also moves in this direction and returns to the original position. The rotation speed of the second gear 44 and the load portion 52 is low and the load portion 52 is rotated at a low speed because the force for returning the second gear 44 to the original position by the pushing member 46 is small. The weight does not come into contact with the drum 531. As a result, the load applied to the second gear 44 by the load applying means 50 does not increase, and the second gear 44 smoothly returns to its original position.

When the lock lever 45 is moved upward by the pushing member 46, the height direction position of the lock portion 451 of the lock lever 45 is the height direction of the lock portion 471 of the lock gear 47 Position. Specifically, the lock portion 451 and the fatigue portion 471 are positioned so as not to overlap in the circumferential direction. Therefore, the state in which the rotation of the lock gear 47 is blocked is canceled, and the lock gear 47 can freely rotate. That is, the state in which the fixed gear 31 of the clutch means (planetary gear train) is freely rotatable, that is, the clutch means is in the " interrupted " state. Thus, the second gear 44 is moved upward in the axial direction thereof, thereby bringing the transmission of the power by the first transmission heat into the " blocked state " through the clutch means.

The driven member 90 always tries to return to the home position by the external load acting on the driven member 90 itself. For example, when the driven body 90 is a valve body that opens and closes the drain port of the washing machine, and the valve body is operated in the direction of opening the drain port by driving the motor unit 1, the valve body always closes the drain port In the direction of the arrow. Therefore, when the clutch means in which the fixed gear 31 is freely rotatable is in the " interrupted " state, the load applied to the driven member 90 is transmitted to the output gear 23 Gear 232). The energy based on the load applied to the driven member 90 transmitted in this way is output (consumed) by revolution of the output side gear 23 because the clutch means is in the "blocked" state. As a result, the driven member 90 returns to its original position.

When the cam gear 25 returns to its original position, the fan-shaped lever 60 having the engaging projection 61 engaging with the cam groove 252 rotates in the direction of approaching the cam gear 25. When the fan-shaped lever 60 is rotated in this way, the input side gear lock projection 62 of the fan-shaped lever 60 is spaced from the pinion projection 223 of the input side gear 22. As a result, the input side gear 22 is allowed to rotate. The second rotor gear 21, which has been pushed upwards in the axial direction by the coil spring, is pushed by the inclined cam 63 and moves downward in the axial direction (the second rotor gear 21 is moved to the first position Lt; / RTI > The upper engaging portion 212 of the second rotor gear 21 engages with the lower engaging portion 412 of the first rotor gear 41 so that the power of the synchronous motor 10 is transmitted to the second And is also transmitted to the rotor gear 21.

At this time, the brake portion 473 of the lock gear 47 brakes the action of the driven member 90 to return to the original position, thereby alleviating the impact on the first transmission line. As a result, breakage of the power transmitting member, which is an individual member constituting the first transfer heat, can be prevented. Further, when the driven member 90 is returned to its original position, the impact sound that is impacted per number of times (when the driven member 90 is a valve that opens and closes the drain port of the washing machine, the impact sound in which such valve member collides with the drain hole) is reduced .

Thus, when the synchronous motor 10 is stopped, the lock of the stationary gear 31 constituting the planetary gear train is released by the action of the pushing member 46, so that the clutch means "blocks" State. As a result, the driven member 90 returns to its original position.

Although the embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the gist of the present invention.

1: Motor unit
10: Synchronous motor
21: Second rotor gear
41: first rotor gear
22: Input side gear
23: Output side gear
231: planetary gear
24: Composite gear
25: cam gear
42: First gear
44: Second gear
45: Lock lever
47: Lock gear
50: load applying means
60: Fan type lever

Claims

A motor rotating in one direction,
A first transmission line having one or a plurality of power transmitting members for transmitting the power of the motor to the driven member;
Clutch means for switching the transmission of power by the first transmission train to a " connected " or " blocked "
And a second gear having a first gear having a first helical tooth portion and a second gear having a second helical tooth portion engaged with the first helical tooth portion,
And load applying means for applying a load to the rotation of the second gear,
The second gear is supported so as to be movable in the axial direction and is always given a force to be pushed in a direction of one side in the axial direction and the clutch means to be in the " blocked " state, The motor unit moves to the other side in the axial direction against the pushing force by a thrust force generated by receiving a load from the imparting means and sets the clutch means to the " connected " state,
A worm wheel portion is formed on the second gear,
The load applying means includes a worm portion engaged with the worm wheel portion, a first bearing and a second bearing that rotatably support the worm portion, a frame portion connecting the first bearing and the second bearing, And a brake portion for imparting a resistance to rotation of the sub-
The upper frame, which is the upper end of the frame portion, connects the first bearing and the second bearing at a position higher than the support position of the worm portion, with the joint surface side of the load applying means facing down to the half- The first bearing and the second bearing are connected to each other by a lower frame which is an opposite side end of the upper frame,
At least one of the first bearing and the second bearing is molded separately from the frame portion,
Wherein a convex portion protruding toward the bearing formed by the separately formed body is formed on a joint surface of the upper frame and the lower frame with the bearing formed by the different body, and the convex portion is sandwiched between the concave portion formed in the bearing The frame portion and the separately formed bearing are connected to each other,
Wherein the frame portion has a reinforcing portion between the upper frame and the lower frame, and a recess or a through hole is formed in the reinforcing portion.

The bearing device according to claim 1, wherein a rib portion for preventing the first bearing or the second bearing from being tilted toward the worm portion is formed on the worm portion side surface of at least one of the frame portion, the first bearing and the second bearing And the motor unit.

3. The motor unit according to claim 2, wherein a planar gripping portion is formed on an opposite side surface of at least one of the first bearings and the second bearings for supporting the worm portion.

4. The bearing device according to claim 3, wherein a fitting portion, which is one or a plurality of convex portions protruding toward the case half body, is formed on a joining surface of at least one of the first bearing and the second bearing with the case half,
Wherein at least one of the engaging portions has a leading end portion having a smaller diameter than that of the root portion,
Wherein the introduction portion is a convex portion whose diameter is made smaller at right angles to the axial direction or a tapered convex portion whose axial length is longer than the root portion and whose diameter becomes smaller toward the case half body side.

A motor rotating in one direction,
A first transmission line having one or a plurality of power transmitting members for transmitting the power of the motor to the driven member;
Clutch means for switching the transmission of power by the first transmission train to a " connected " or " blocked "
And a second gear having a first gear having a first helical tooth portion and a second gear having a second helical tooth portion engaged with the first helical tooth portion,
And load applying means for applying a load to the rotation of the second gear,
The second gear is supported so as to be movable in the axial direction and is always given a force to be pushed in a direction of one side in the axial direction and the clutch means to be in the " blocked " state, The motor unit moves to the other side in the axial direction against the pushing force by a thrust force generated by receiving a load from the imparting means and sets the clutch means to the " connected " state,
A worm wheel portion is formed on the second gear,
The load applying means includes a worm portion engaged with the worm wheel portion, a first bearing and a second bearing that rotatably support the worm portion, a frame portion connecting the first bearing and the second bearing, And a brake portion for imparting a resistance to rotation of the sub-
Wherein the upper frame which is the upper end of the frame portion is disposed at a position higher than the support position of the worm portion with the joint side of the load applying means to the case half being downward, And a lower frame which is an opposite end of the upper frame is formed to connect the first bearing and the second bearing in parallel with the worm portion at a position below the worm portion,
Wherein the upper frame and the lower frame are connected to each other via a reinforcing portion having a recess or a through hole between the upper frame and the lower frame.

The motor unit according to claim 5, wherein the reinforcing portion is formed with the through hole so as to reinforce the upper frame and the lower frame in a brace shape.

The bearing device according to claim 6, wherein at least one of the frame portion, the first bearing, and the second bearing has a rib portion formed on the worm portion side surface to prevent the first bearing or the second bearing from tilting toward the worm portion And the motor unit.

A motor rotating in one direction,
A first transmission line having one or a plurality of power transmitting members for transmitting the power of the motor to the driven member;
Clutch means for switching the transmission of power by the first transmission train to a " connected " or " blocked "
And a second gear having a first gear having a first helical tooth portion and a second gear having a second helical tooth portion engaged with the first helical tooth portion,
And load applying means for applying a load to the rotation of the second gear,
The second gear is supported so as to be movable in the axial direction and is always given a force to be pushed in a direction of one side in the axial direction and the clutch means to be in the " blocked " state, The motor unit moves to the other side in the axial direction against the pushing force by a thrust force generated by receiving a load from the imparting means and sets the clutch means to the " connected " state,
A worm wheel portion is formed on the second gear,
The load applying means includes a worm portion engaged with the worm wheel portion, a first bearing and a second bearing that rotatably support the worm portion, a frame portion connecting the first bearing and the second bearing, And a brake portion for imparting a resistance to rotation of the sub-
The upper frame, which is the upper end of the frame portion, connects the first bearing and the second bearing at a position higher than the support position of the worm portion, with the joint surface side of the load applying means facing down to the half- ,
Wherein the frame portion is integrally formed with the second bearing, the first bearing is formed separately from the frame portion, and a drum for storing the brake portion is formed,
Wherein a convex portion protruding toward the first bearing is formed on a joining surface of the upper frame and the lower frame, which is an opposite end of the upper frame, to the first bearing, and the convex portion is formed on the concave portion formed on the first bearing side And the frame portion and the first bearing are connected to each other.

The motor unit according to claim 8, wherein a rib portion is formed on the worm portion side surface of the lower frame and the second bearing to prevent the second bearing from tilting toward the worm portion.

10. The apparatus according to claim 9, wherein the upper frame is formed parallel to the worm portion,
Wherein the lower frame is formed to connect the first bearing and the second bearing in parallel with the worm portion at a position lower than the worm portion,
Wherein the upper frame and the lower frame are connected to each other via a reinforcing portion having a recess or a through hole between the upper frame and the lower frame.

A motor rotating in one direction,
A first transmission line having one or a plurality of power transmitting members for transmitting the power of the motor to the driven member;
Clutch means for switching the transmission of power by the first transmission train to a " connected " or " blocked "
And a second gear having a first gear having a first helical tooth portion and a second gear having a second helical tooth portion engaged with the first helical tooth portion,
And load applying means for applying a load to the rotation of the second gear,
The second gear is supported so as to be movable in the axial direction and is always given a force to be pushed in a direction of one side in the axial direction and the clutch means to be in the " blocked " state, The motor unit moves to the other side in the axial direction against the pushing force by a thrust force generated by receiving a load from the imparting means and sets the clutch means to the " connected " state,
A worm wheel portion is formed on the second gear,
The load applying means includes a worm portion engaged with the worm wheel portion, a first bearing and a second bearing that rotatably support the worm portion, a frame portion connecting the first bearing and the second bearing, And a brake portion for imparting a resistance to rotation of the sub-
The upper frame, which is the upper end of the frame portion, connects the first bearing and the second bearing at a position higher than the support position of the worm portion, with the joint surface side of the load applying means facing down to the half- ,
Wherein the frame portion is integrally formed with the second bearing, a drum for storing the brake portion is formed in the first bearing,
Wherein a rib portion that prevents the second bearing from being tilted toward the worm portion is formed on the worm portion side surface of the frame portion and the second bearing.

12. The apparatus of claim 11, wherein the frame portion is connected to the first bearing and the second bearing by a lower frame which is an opposite side end of the upper frame and the upper frame,
Wherein the upper frame is formed to connect the first bearing and the second bearing in parallel with the worm portion at a position above the worm portion,
Wherein the lower frame is formed to connect the first bearing and the second bearing in parallel with the worm portion at a position lower than the worm portion,
Wherein the upper frame and the lower frame are connected to each other via a reinforcing portion having a recess or a through hole between the upper frame and the lower frame.

A motor rotating in one direction,
A first transmission line having one or a plurality of power transmitting members for transmitting the power of the motor to the driven member;
Clutch means for switching the transmission of power by the first transmission train to a " connected " or " blocked "
And a second gear having a first gear having a first helical tooth portion and a second gear having a second helical tooth portion engaged with the first helical tooth portion,
And load applying means for applying a load to the rotation of the second gear,
The second gear is supported so as to be movable in the axial direction and is always given a force to be pushed in a direction of one side in the axial direction and the clutch means to be in the " blocked " state, The motor unit moves to the other side in the axial direction against the pushing force by a thrust force generated by receiving a load from the imparting means and sets the clutch means to the " connected " state,
A worm wheel portion is formed on the second gear,
The load applying means includes a worm portion engaged with the worm wheel portion, a first bearing and a second bearing that rotatably support the worm portion, a frame portion connecting the first bearing and the second bearing, And a brake portion for imparting a resistance to rotation of the sub-
The upper frame, which is the upper end of the frame portion, connects the first bearing and the second bearing at a position higher than the support position of the worm portion, with the joint surface side of the load applying means facing down to the half- The first bearing and the second bearing are connected to each other by a lower frame which is an opposite side end of the upper frame,
Wherein the upper frame and the lower frame are connected to each other via a reinforcing portion having a concave portion or a through hole between the upper frame and the lower frame,
And a planar gripping portion is formed on an opposite surface of at least one of the first bearing and the second bearing, the surface of the first bearing supporting the worm portion.

14. The apparatus according to claim 13, wherein the upper frame is formed to connect the first bearing and the second bearing in parallel with the worm portion at a position above the worm portion,
Wherein the lower frame is formed to connect the first bearing and the second bearing in parallel with the worm portion at a position lower than the worm portion,
Wherein the upper frame and the lower frame connect the first bearing and the second bearing to the worm portion at a side opposite to a side where the worm wheel portion of the second gear is disposed. .

15. The apparatus of claim 14, wherein a rib portion is formed on the worm portion side surface of at least one of the frame portion, the first bearing, and the second bearing to prevent the first bearing or the second bearing from tilting toward the worm portion And the motor unit.

A motor rotating in one direction,
A first transmission line having one or a plurality of power transmitting members for transmitting the power of the motor to the driven member;
Clutch means for switching the transmission of power by the first transmission train to a " connected " or " blocked "
And a second gear having a first gear having a first helical tooth portion and a second gear having a second helical tooth portion engaged with the first helical tooth portion,
And load applying means for applying a load to the rotation of the second gear,
The second gear is supported so as to be movable in the axial direction and is always given a force to be pushed in a direction of one side in the axial direction and the clutch means to be in the " blocked " state, The motor unit moves to the other side in the axial direction against the pushing force by a thrust force generated by receiving a load from the imparting means and sets the clutch means to the " connected " state,
A worm wheel portion is formed on the second gear,
The load applying means includes a worm portion engaged with the worm wheel portion, a first bearing and a second bearing that rotatably support the worm portion, a frame portion connecting the first bearing and the second bearing, And a brake portion for imparting a resistance to rotation of the sub-
The upper frame, which is the upper end of the frame portion, connects the first bearing and the second bearing at a position higher than the support position of the worm portion, with the joint surface side of the load applying means facing down to the half- ,
Wherein at least one of the first bearing and the second bearing is provided with a fitting portion which is one or a plurality of convex portions protruding toward the case half body on a joint surface between the case half and the at least one of the first bearing and the second bearing,
Wherein at least one of the engaging portions is formed with an introduction portion having a smaller diameter than the root portion, the introduction portion includes a convex portion whose diameter is made smaller at right angles to the axial direction, or a convex portion whose axial length is longer than the root portion, Is a tapered convex portion whose diameter is reduced toward the front side of the motor unit.

17. The bearing device according to claim 16, wherein said fitting portion, which is a plurality of convex portions protruding toward said case half body, is formed on a joint surface of each of said first bearing and said second bearing with said case half,
Wherein the introduction portion is formed at the tip end of each of the plurality of fitting portions.

The bearing device according to claim 17, wherein a plurality of said fitting portions provided in said first bearing and a plurality of said fitting portions provided in said second bearing are arranged in a direction orthogonal to an axial direction of said worm portion Characterized by a motor unit.

19. The apparatus of claim 18, wherein at least one of the first bearing and the second bearing is molded separately from the frame portion,
A convex portion protruding toward the bearing formed by the separately formed body is formed on a joint surface between the upper frame and a lower frame which is an opposite side end portion of the upper frame to the separately formed bearing, Wherein the frame portion and the separately formed bearing are connected to each other by engaging with the recess formed in the frame portion.

17. The apparatus according to claim 16, wherein the upper frame is formed to connect the first bearing and the second bearing in parallel with the worm portion at a position above the worm portion,
A lower frame which is an opposite side end of the upper frame is formed to connect the first bearing and the second bearing in parallel with the worm portion at a lower position relative to the worm portion,
Wherein the upper frame and the lower frame are connected to each other via a reinforcing portion having a recess or a through hole between the upper frame and the lower frame.

21. The motor unit according to claim 20, wherein the reinforcing portion is formed with the through hole so as to reinforce the upper frame and the lower frame in a brace shape.

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