JP2002364713A - Motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor that can be improved in motor efficiency, reduced in uneven wear of a bearing and miniaturized, in a motor comprising a worm and a worm wheel. SOLUTION: The motor comprises a yoke 4, a rotary shaft 6 supported in the yoke 4 and driven rotatively, a gear housing 21 fixed to the yoke 4, a worm shaft 23 supported in the gear housing 21 coaxially with the rotary shaft 6, the worm wheel 24 meshed with the worm shaft 23 and coupled to an output side, and a shock absorbing connection member 30 for coupling the rotary shaft 6 and the worm shaft 23 for substantially integral rotation thereof, allowing decentering of the rotary shaft 6 and the worm shaft 23 and absorbing a shock between the rotary shaft 6 and the worm shaft 23.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a motor, and more particularly, to a motor having a worm and a worm wheel.

[0002]

2. Description of the Related Art Conventionally, a motor used in a power window device, a sunroof device, and the like has a motor body and a speed reduction unit. In such a motor, a worm (worm shaft) is formed at the tip of a rotating shaft that is driven to rotate by a motor body, and the worm is housed in a gear housing of a reduction unit and meshed with a worm wheel. There is something. In such a motor, the rotating shaft is supported by bearings at three locations: a base end, a tip end, and an intermediate portion. Further, in such a motor, when the overload is applied on the output side while the rotating shaft is being driven, the worm receives a large force in a direction orthogonal to the axis (radial direction) due to a reaction force that meshes with the worm wheel. A clearance for releasing the shaft is provided between the intermediate portion of the rotating shaft and the bearing to allow the shaft to bend and absorb the impact.

[0003]

However, if the clearance is provided as described above, the amount of engagement between the worm and the worm wheel is reduced by the amount of the clearance, and the motor efficiency is reduced. . In addition, there is a problem that uneven wear of the bearing is likely to occur because the rotating shaft is bent. This causes abnormal noise and the like.

Further, a rubber cushion or the like is provided inside a worm wheel, and the above-mentioned impact is absorbed by the rubber cushion by rotating an output shaft on the output side via the rubber cushion. is there. However, in this case, since the impact is absorbed after deceleration, the volume of the rubber cushion becomes large, and there is a problem that it is difficult to reduce the size and thickness of the worm wheel.

The present invention has been made to solve the above problems, and an object of the present invention is to improve the motor efficiency of a motor having a worm and a worm wheel.
An object of the present invention is to provide a motor capable of reducing uneven wear of a bearing and reducing the size.

[0006]

In order to achieve the above object, according to the present invention, there is provided a motor case, a rotating shaft supported by the motor case and driven to rotate, and fixed to the motor case. A gear housing, a worm shaft supported by the gear housing coaxially with the rotation shaft, a worm wheel meshed with the worm shaft and connected to the output side, and the rotation shaft and the worm shaft. The present invention is characterized in that a motor is connected so as to be substantially integrally rotatable, and has a shock-absorbing connecting member for absorbing an impact between the rotating shaft and the worm shaft.

According to a second aspect of the present invention, in the motor according to the first aspect, the shock-absorbing connecting member has a rotating shaft side engaging portion that rotates integrally with the rotating shaft and is engageable in a rotating direction. A rotating shaft side rotating body, integrally rotating with the worm shaft,
A worm shaft side rotating body having a worm shaft side engaging portion engageable in a rotating direction; and a worm shaft side rotating portion disposed between the rotating shaft side engaging portion and the worm shaft side engaging portion in a rotating direction. And a buffer member to be used.

[0008] The invention according to claim 3 is the invention according to claim 1 or 2.
Wherein the buffer member is provided between the adjacent rotary shaft side engaging portion and the worm shaft side engaging portion, and the respective buffer members are annularly connected by a buffer member connecting portion. .

According to a fourth aspect of the present invention, in the motor according to the third aspect, the buffer member connecting portion has elasticity, and the rotation shaft side rotating body and the worm shaft side rotating body are mutually centered. It is interposed in a gap for allowing a shift.

[0010] The invention described in claim 5 provides the invention according to claims 2 to 4.
In the motor according to any one of the above, a plurality of the rotating shaft side engaging portions and the plurality of worm shaft side engaging portions are provided in the rotating direction.

According to a sixth aspect of the present invention, in the motor according to the fifth aspect, the rotating shaft side engaging portion and the worm shaft side engaging portion are provided at equal angular intervals. According to a seventh aspect of the present invention, in the motor according to any one of the first to sixth aspects, the rotating shaft and the worm shaft are arranged with respect to the motor case and the gear housing.
Each is rotatably supported at least at two places on both ends.

[0012] The invention described in claim 8 is the first to seventh aspects.
In the motor according to any one of the above, the buffer member is made of a rubber material. According to a ninth aspect of the present invention, in the motor according to any one of the first to eighth aspects, a rotation for detecting rotation of the rotation shaft or the worm shaft is provided on a part of the buffer connection member. A detection member was provided.

According to a tenth aspect of the present invention, there is provided a motor case, a rotating shaft supported by the motor case and driven to rotate, a gear housing fixed to the motor case, and the motor shaft being coaxial with the rotating shaft. A worm shaft supported by the gear housing, a worm wheel meshed with the worm shaft and connected to the output side, and the rotation shaft and the worm shaft are connected so as to be substantially integrally rotatable; The gist of the present invention is to provide a motor including a rotational coupling and a shock-absorbing connecting member that absorbs an impact between the worm and the worm.

(Operation) According to the first aspect of the present invention,
The rotating shaft and the worm shaft are connected so as to be substantially integrally rotatable by the buffer connecting member, and the shock between the rotating shaft and the worm shaft is absorbed by the buffer connecting member. Therefore, for example, when an overload is applied on the output side while the rotating shaft is being driven, an impact from the output side is absorbed by the buffer connection member. This eliminates the need for providing a clearance for relief in the radial direction of the worm shaft, for example, between the worm shaft and its bearing. Therefore, it is possible to suppress a decrease in the amount of engagement between the worm shaft and the worm wheel for the clearance, and to increase the efficiency of the motor. Further, since the impact is absorbed, the worm shaft is less likely to bend, and uneven wear of the bearing is reduced. Furthermore, the volume of a cushioning member for absorbing an impact, for example, a rubber material can be reduced as compared with a case where a cushioning member is provided between the worm wheel and the output side.

According to the second aspect of the present invention, when the rotating shaft is driven to rotate, the rotating shaft side rotating body rotates integrally, and the worm shaft side engaging member is rotated from the rotating shaft side engaging portion via the buffer member. The rotational force is transmitted to the joint, and the worm shaft side rotating body and the worm shaft are rotated substantially integrally. Therefore, the shock between the rotating shaft and the worm shaft is absorbed by the buffer member.

According to the third aspect of the present invention, the buffer member is provided between the adjacent rotary shaft side engaging portion and the worm shaft side engaging portion, and each of the buffer members is provided with a buffer member. Since the connection portion is annularly connected, the buffer member becomes a single component, and an increase in the number of components is suppressed. In addition, since each buffer member is connected in a ring shape by the buffer member connecting portion, the buffer member may protrude radially outward from between the adjacent rotation shaft side engaging portion and the worm shaft side engaging portion. Is prevented.
Therefore, a structure for holding the buffer member in the radial direction is not particularly required, and each member can have a simple shape and configuration.

According to the fourth aspect of the present invention, the cushioning member connecting portion has elasticity, and a gap for allowing the rotational shaft side rotating body and the worm shaft side rotating body to be misaligned with each other. , The misalignment of the rotating shaft and the worm shaft is allowed, and the collision between the rotating shaft side rotating body and the worm shaft side rotating body and the accompanying noise and wear are reduced.

According to the fifth aspect of the present invention, the rotating shaft side engaging portion and the worm shaft side engaging portion are each provided in a plurality in the rotating direction, so that the rotating shaft side engaging portion and the worm shaft adjacent to each other are provided. The number of buffer members provided between the shaft-side engaging portions can be four or more, and the load on each buffer member can be reduced. Therefore, the impact between the rotating shaft and the worm shaft is well-balanced, and the durability is improved.

According to the sixth aspect of the present invention, the rotating shaft side engaging portion and the worm shaft side engaging portion are provided at equal angular intervals, so that each member is not largely rotated. However, positioning in the circumferential direction at the time of assembly can be performed. Therefore, the assembling work becomes easy.

According to the invention described in claim 7, the rotating shaft and the worm shaft are rotatably supported by the motor case and the gear housing at at least two positions on both ends. And since the impact between the rotating shaft and the worm shaft is absorbed, the rotating shaft and the worm shaft are always kept coaxially (they are hard to escape in the radial direction, are hard to bend,
Less rattling). Therefore, in particular, it is possible to suppress a decrease in the amount of engagement between the worm shaft and the worm wheel, and to increase the efficiency of the motor.

According to the eighth aspect of the present invention, since the cushioning member is made of a rubber material, it can be easily formed and arranged. According to the invention as set forth in claim 9, since a rotation detecting member for detecting the rotation of the rotation shaft or the worm shaft is provided in a part of the cushioning connection member, for example, a rotation detection member is provided in advance. By fixing the sensor magnet as a part of the buffer connection member, the component management becomes easy.

According to the tenth aspect of the present invention, the rotation shaft and the worm shaft are connected so as to be substantially integrally rotatable by the shock-absorbing connection member, and misalignment between the rotation shaft and the worm shaft is allowed. At the same time, the impact between the rotating shaft and the worm shaft is absorbed. Therefore, for example, when an overload is applied on the output side while the rotating shaft is being driven, an impact from the output side is absorbed by the buffer connection member. This eliminates the need for providing a clearance for relief in the radial direction of the worm shaft, for example, between the worm shaft and its bearing. Therefore, it is possible to suppress a decrease in the amount of engagement between the worm shaft and the worm wheel for the clearance, and to increase the efficiency of the motor. Further, since the impact is absorbed, the worm shaft is less likely to bend, and uneven wear of the bearing is reduced. Furthermore, the volume of a cushioning member for absorbing an impact, for example, a rubber material can be reduced as compared with a case where a cushioning member is provided between the worm wheel and the output side.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. FIG.
3 shows a cross-sectional view of a main part of the motor 1 in the present embodiment. The motor 1 includes a motor body 2 and a speed reduction unit 3.

As shown in FIG. 1, the motor body 2 is
A yoke housing (hereinafter simply referred to as a yoke) 4 as a motor case, a pair of magnets 5, a rotating shaft 6, a core iron 7, a commutator 8, a resin brush holder 9, a power supply brush 10, a main body Side first and second bearings 11 and 12 are provided.

The yoke 4 is formed in a substantially flat cylindrical shape with a bottom. A pair of magnets 5 are fixed to the inner peripheral surfaces of both ends in the longitudinal direction of the yoke 4 in a section orthogonal to the axis. A first body-side bearing 11 is fixed to the bottom of the yoke 4, and the base end of the rotating shaft 6 is rotatably supported by the bearing 11. As shown in FIG. 2, a two-plane width convex portion 6a (see FIGS. 2 and 3) which is chamfered in parallel from a cylindrical shape is formed at the tip of the rotating shaft 6.

The core core 7 is fixed to an intermediate portion of the rotary shaft 6 corresponding to the position of the magnet 5. Further, a commutator 8 is fixed to the rotation shaft 6 at a more distal end side than the core iron core 7.

In the opening of the yoke 4, a flange 4 extending outward in the longitudinal direction of a section orthogonal to the axis of the yoke 4 is provided.
a is formed. A brush holder 9 is fitted and fixed to the opening of the yoke 4. This brush holder 9
The opening corresponds to the opening of the yoke 4 and substantially covers the opening.
Inside the yoke 4 of the brush holder 9, a pair of brushes 10 connected to an external control device (external power source) not shown by wiring not shown is provided. Also, brush holder 9
The main body side second bearing 12 is provided at substantially the center of the
At 2, a tip end of the rotary shaft 6 is rotatably supported.

Here, the brush 10 is arranged at a position corresponding to the commutator 8 and is in contact with the commutator 8. Therefore, when current is supplied from the control device (external power supply) to the coil conductor wound around the core core 7 via the brush 10 and the commutator 8, the core core 7 and the rotating shaft 6 are driven to rotate.

The speed reducer 3 includes a gear housing 21, first and second bearings 22 a and 22 b on the speed reducer side, and a worm shaft 2.
3, a worm wheel 24, and an output shaft 25. The gear housing 21 is made of resin, and has an end (an upper side in FIG. 1) fixed to the motor body 2 (hereinafter, referred to as an upper end).
A fitting recess 21a into which the brush holder 9 is fitted is formed in the upper end portion. When the brush holder 9 is fitted in the fitting recess 21a, the gear housing 21 has the upper end outer edge side of the flange 4a of the yoke 4.
Is screwed with a screw 26.

The gear housing 21 has the fitting recess 2
1a, a circular housing recess 21b recessed from the center of the housing recess 21b, and a worm shaft housing 21 recessed from the center of the bottom of the housing recess 21b so as to extend along the axial direction of the rotating shaft 6.
c is formed. Further, the gear housing 21 is provided with an intermediate portion of the worm shaft housing 21c in a direction orthogonal to the axis (FIG.
A wheel housing 21d communicating with the worm shaft housing 21c is formed in the middle and left directions.

The first bearing 22a on the reduction gear side is fixed to the opening of the worm shaft housing 21c of the gear housing 21. Further, the second reduction bearing 22b is fixed to the bottom of the worm shaft housing 21c. It should be noted that the first and second bearings 22a, 22b on the reduction section side of the present embodiment.
Is a slide bearing (metal bearing) made of metal and having a substantially cylindrical shape.

The worm shaft 23 is made of a metal material, and has a worm 23a formed at an intermediate portion thereof. At the base end of the worm shaft 23, a two-width convex portion 23b (see FIGS. 2 and 3) which is chamfered in parallel from a cylindrical shape is formed. Also, the base end of the worm shaft 23 has
A cylindrical contact protrusion 23c (see FIGS. 2 and 3) protruding from 3b is formed. And the worm shaft 23
The first and second bearings 22 on both sides of the speed reduction section
a, 22b rotatably supported by the worm shaft housing 2
1c.

The worm wheel 24 includes a worm 23a
The wheel housing 21 is rotatable about an axis in a direction perpendicular to the worm shaft 23 (a direction perpendicular to the plane of FIG. 1).
d. The output shaft 25 is connected to the worm wheel 24 so as to rotate coaxially with the rotation of the worm wheel 24. The output shaft is connected to an external load (not shown), for example, a window glass of a vehicle or a roof glass of a sunroof.

The rotation shaft 6 is connected to the worm shaft 23 via a buffer connection member 30. The shock-absorbing connecting member 30 connects the rotating shaft 6 and the worm shaft 23 so as to be substantially integrally rotatable, and absorbs an impact between the rotating shaft 6 and the worm shaft 23. Specifically, as shown in FIGS. 2 and 3, the buffer connection member 30 includes a rotating shaft side rotating body 31, a worm shaft side rotating body 32, an integrated buffering member 33, and a ball 34.

The rotating shaft-side rotating body 31 is made of resin, and has a substantially disk-shaped disk portion 31a, as shown in FIGS.
A cylindrical portion 31b extending in the axial direction (downward in FIGS. 2, 3 and 5) from the axis of the disk portion 31a, and a disk portion 31a
The axial direction from the predetermined position of the outer peripheral edge of FIG.
And a rotating shaft side engaging portion 31c protruding in the middle and downward directions. Rotary shaft side engaging portion 31c of the present embodiment
Project from three places on the outer peripheral edge of the disk portion 31a.
The rotating shaft side engaging portions 31c are provided at equal angular intervals on the outer peripheral edge of the disk portion 31a. Also, each rotating shaft side engaging portion 3
1c is formed in a substantially fan shape centered on the axial center of the disk portion 31a. At the center of the axis of the disk portion 31a and the cylindrical portion 31b, a two-width concave portion 31d into which the two-width protrusion 6a of the rotary shaft 6 can be inserted is recessed from the disk portion 31a side. Further, a tapered concave portion 31e whose diameter gradually decreases from the distal end side is formed at the axial center distal end portion of the cylindrical portion 31b. The tapered recess 31e is formed to communicate with the two-plane width recess 31d. And the rotating shaft side rotating body 3
1 is fixed so that the two-sided convex portion 6a of the rotary shaft 6 is inserted into the two-sided concave portion 31d and rotates integrally with the rotary shaft 6.

The worm-shaft-side rotating body 32 is made of a resin, and as shown in FIGS. 2, 3, 7 and 8, a substantially cylindrical cylindrical portion 32a and an axial direction from the axial center of the cylindrical portion 32a. (In FIG. 2, FIG. 3, and FIG. 8, in the upward direction), the cylindrical portion 3 is extended.
2b, and a worm shaft side engaging portion 32c protruding from a predetermined position on the outer peripheral side of the cylindrical portion 32a in the axial direction (upward in FIGS. 2, 3 and 8). The worm shaft side engaging portion 32c of the present embodiment protrudes from three locations on the outer peripheral side of the cylindrical portion 32a. Also, the worm shaft side engaging portion 3
2c are provided at equal angular intervals on the outer peripheral side of the cylindrical portion 32a. Further, each worm shaft side engaging portion 32c is
It is formed in a substantially fan shape centering on the axial center of 2a.
Further, in the cylindrical portion 32a, in the axial direction (downward in FIGS. 2, 3 and 8) opposite to the cylindrical portion 32b, the inner diameter extends in the same cylindrical shape as the outer diameter of the worm shaft 23. A sensor magnet press-fit portion 32g is formed. or,
In the center of the axis of the cylindrical portion 32a, a two-width concave portion 32d into which the two-width convex portion 23b of the worm shaft 23 can be inserted is formed.
b is recessed from the opposite side. Further, the columnar portion 32a
In addition, a circular concave portion 32e into which the contact convex portion 23c of the worm shaft 23 can be inserted is formed in the center of the axis of the cylindrical portion 32b from the bottom of the two-plane wide concave portion 32d. Further, a tapered concave portion 32f whose diameter gradually decreases from the distal end side is formed at the axial center distal end portion of the cylindrical portion 32b. The tapered recess 32f is formed to communicate with the circular recess 32e. The worm shaft-side rotating body 32 has a two-sided recess 3.
The two-width protrusion 23b of the worm shaft 23 is fitted into 2d, and the contact protrusion 23c is fitted into the circular recess 32e, and is fixed so as to rotate integrally with the worm shaft 23.

The integral cushioning member 33 is made of a rubber material. As shown in FIGS. 2, 3, and 6, the integral cushioning member 33 includes a cushioning portion coupling portion 33a as an annular cushioning member coupling portion and an outer periphery of the cushioning portion coupling portion 33a. Buffer portion 33 as a radially protruding buffer member
b. The inner diameter of the buffer connection portion 33a of the integral buffer member 33 is set to be substantially the same as the outer diameter of each of the cylindrical portions 31b and 32b of the rotating shaft side rotating body 31 and the worm shaft side rotating body 32. In addition, the buffer connection section 33
The outer diameter of “a” is the inner diameter of each of the rotating shaft side engaging portions 31c and each of the worm shaft side engaging portions 32c (each of the engaging portions 31c, 32c).
c is set to be approximately the same as the radius from the inside of c to the axis center of the rotating bodies 31 and 32). Also, the buffer 33b
Are provided in the circumferential direction of the buffer portion connecting portion 33a. The buffer portions 33b are provided at equal angular intervals. Further, the buffer portion 33b is formed in a substantially fan shape centering on the axial center of the buffer portion connecting portion 33a.

The rotating shaft side rotating body 31, the worm shaft side rotating body 32, and the integrated buffering member 33
b are connected so as to be disposed between the rotating shaft side engaging portion 31c and the worm shaft side engaging portion 32c which are adjacent in the circumferential direction. At this time, as shown in FIG. 3, the buffer portion connecting portion 33a is externally fitted to each of the cylindrical portions 31b and 32b, and is provided inside each of the rotating shaft side engaging portions 31c and each of the worm shaft side engaging portions 32c. It is arranged to be internally fitted. At this time, a ball 34 is provided between the opposed tapered concave portions 31e and 32f.
Are substantially accommodated and held, and the ball 34 is
The tip of the surface width convex portion 6a) and the worm shaft 23 (the contact convex portion 2)
3c). Further, in such a connected state, between the end surfaces of the opposed cylindrical portions 31b and 32b, between the opposed rotating shaft side engaging portion 31c and the end surface of the cylindrical portion 32a, and between the opposed worm shaft side engaging portions. 32c and disk part 31a
The dimensions of each member are set such that a slight gap is formed between the end faces. Therefore, at least one
The worm shaft-side rotating body 32 can be tilted with respect to the rotating shaft-side rotating body 31 in a range until the two end faces come into contact with each other. In addition, at the time of this tilting, the buffer connection portion 33a is compressed and elastically deformed.

In this embodiment, before the worm shaft-side rotating body 32 is fixed, the sensor magnet 41 as a rotation detecting member is pressed into the sensor magnet press-fitting portion 32g of the worm shaft-side rotating body 32 and fixed. Have been. More specifically, as shown in FIG. 2, the sensor magnet 41 is formed in a substantially disk shape having the same outer diameter as the cylindrical portion 32a. A circular hole 41a into which 32g can be press-fitted is formed. The sensor magnet 41 is fixed to the worm shaft side rotating body 32 by press-fitting the sensor magnet press-fitting portion 32g into the circular hole 41a. or,
At a position corresponding to the sensor magnet 41 of the gear housing 21 of the present embodiment, a rotation sensor (for example, a Hall IC) (not shown) is arranged, and feedback control can be performed by a detection signal of the rotation sensor.

The motor 1 configured as described above operates as follows. The motor body 2 is driven and the rotating shaft 6
Is rotated, the rotating shaft 6 and the rotating shaft side rotating body 31 rotate integrally. Then, the worm shaft side engaging portion 32 of the worm shaft side rotating body 32 is transferred from the rotating shaft side engaging portion 31c of the rotating shaft side rotating body 31 through the buffer portion 33b of the integral buffer member 33.
The rotational force is transmitted to c, and the worm shaft side rotating body 32 and the worm shaft 23 rotate substantially integrally with the rotating shaft side rotating body 31. Then, the worm wheel 24 rotates according to the rotation of the worm shaft 23, and the output shaft 25 rotates according to the rotation of the worm wheel 24. Therefore, a load connected to the output shaft 25, for example, a window glass of a vehicle, a roof glass of a sunroof, or the like is driven.

If an overload is applied to the output shaft 25 during the driving as described above, for example, the buffer connecting member 30,
Specifically, the shock between the rotating shaft 6 and the worm shaft 23 is absorbed by the buffer portion 33b of the integrated buffer member 33.

Next, the characteristic effects of the above embodiment will be described below. (1) Since the shock between the rotating shaft 6 and the worm shaft 23 is absorbed by the shock-absorbing connecting member 30, more specifically, the shock-absorbing portion 33 b of the integrated shock-absorbing member 33, the worm shaft 23 and the first and second speed reducer side are reduced. There is no need to provide a clearance for releasing the worm shaft 23 in the radial direction between the bearings 22a and 22b. Therefore, a reduction in the amount of engagement between the worm shaft 23 and the worm wheel 24 for the clearance can be suppressed, and the efficiency of the motor 1 can be increased. Further, since the impact is absorbed, the worm shaft 23 is less likely to bend, and uneven wear of the first and second reduction-portion-side bearings 22a and 22b is reduced. Furthermore, unlike the case where a buffer member is provided between the worm wheel 24 and the output shaft 25, the shock is absorbed before the motor 1 is decelerated, so that the volume of the buffer member (the buffer portion 33b) can be reduced.

(2) The buffer portions 33b are respectively provided between the adjacent rotary shaft side engaging portions 31c and the worm shaft side engaging portions 32c, and each of the buffer portions 33b is connected to the buffer portion connecting portion 33a.
, The buffer member becomes a single component (integral buffer member 30), and an increase in the number of components is suppressed. This suppresses an increase in the number of assembly work steps.
In addition, since each of the buffer portions 33b is annularly connected by the buffer portion connecting portion 33a, the buffer portion 33b protrudes radially outward from between the adjacent rotation shaft side engaging portion 31c and worm shaft side engaging portion 32c. Is prevented. Therefore, a structure for holding the buffer portion 33b in the radial direction is not particularly required, and each member can have a simple shape and configuration.

(3) Each of the cylinder portions 31
b, 32b, and each rotating shaft side engaging portion 3
1c and each worm shaft side engaging portion 32c. In other words, the buffer connection section 33
a is a rotating shaft side rotating body 31 and a worm shaft side rotating body 32
Are interposed in gaps for allowing mutual misalignment. And since the buffer connection part 33a has elasticity, misalignment of the rotating shaft 6 and the worm shaft 23 is allowed, and the collision between the rotating shaft side rotating body 31 and the worm shaft side rotating body 32 and the accompanying Noise and wear are reduced. Note that the misalignment of the rotating shaft 6 and the worm shaft 23 is allowed,
Since high dimensional accuracy and high assembly accuracy of each member are not required, the cost of the motor 1 can be reduced.

(4) The rotating shaft side engaging portion 31c and the worm shaft side engaging portion 32c are provided three each in the rotating direction, and the adjacent rotating shaft side engaging portion 31c and worm shaft side engaging portion 32c are provided. The number of the buffer portions 33b provided between them is six. Therefore, the load applied to each buffer 33b is reduced. Therefore, the rotating shaft 6 and the worm shaft 2
The impact between the three is well-balanced and the durability is improved.

(5) Since the rotating shaft side engaging portion 31c, the worm shaft side engaging portion 32c, and the buffer portion 33b are provided at equal angular intervals, each member 31c, 32c, 33b is provided.
Can be positioned in the circumferential direction at the time of assembling, without having to turn the shaft significantly. Therefore, the assembling work becomes easy. Also, each member 31c, 32c, 33b
Has a shape that repeats a predetermined pattern in the circumferential direction, so that the members 31c, 32c, and 33b can be easily designed and manufactured.

(6) The rotating shaft 6 and the worm shaft 23 are rotatably supported by the yoke 4 and the gear housing 21 at two positions on both ends. Since the impact between the rotating shaft 6 and the worm shaft 23 is absorbed, the rotating shaft 6 and the worm shaft 23 can be always kept coaxially (hard to escape in the radial direction, hard to bend, and hard to rattle). it can.
Therefore, in particular, it is possible to suppress a decrease in the amount of engagement between the worm shaft 23 and the worm wheel 24, and it is possible to increase the efficiency of the motor 1.

(7) Integrated buffer member 33 (buffer section 33b)
Since it is made of rubber, it can be easily formed and arranged. (8) The worm shaft side rotating body 32 has a two-sided recess 32d.
And a sensor magnet press-fitting portion 32g are formed in the sensor magnet 41.
Is formed into a circular hole 41a into which the two
Each member is prevented from rotating by inserting a two-plane width convex portion 23b formed on the worm shaft 23 into d. With this configuration, it is not necessary to form two types of rotation preventing portions (for the worm shaft side rotating body 32 and for the sensor magnet 41) that are engaged with the worm shaft 23 in the rotational direction, so that the processing is facilitated and the manufacturing is facilitated. Cost can be reduced.
Further, since the sensor magnet 41 is fixed to the worm shaft side rotating body 32 made of resin, the crack is reduced.

(9) Since the sensor magnet 41 (rotation detecting member) is fixed to the worm shaft side rotating body 32 which is a part of the buffer connection member 30, for example, the sensor magnet 41 is previously fixed to the worm shaft side rotating body. By fixing to 32, the component management becomes easy.

The above embodiment may be modified and implemented as follows. In the above embodiment, the shock absorbing connecting member 30 includes the rotating shaft side rotating body 31, the worm shaft side rotating body 32, the integrated shock absorbing member 33, and the ball 34, but the rotating shaft 6 and the worm shaft 23 are connected so as to be able to rotate substantially integrally,
If the impact between the rotating shaft 6 and the worm shaft 23 can be absorbed,
You may change to another structure. For example, the configuration may be such that the ball 34 is omitted. In this case, it is necessary to appropriately change the shape and the like of the other members. Even in this case, the same effect as in the above embodiment can be obtained.

In the above-described embodiment, each buffer portion 33b is annularly connected by the buffer portion connecting portion 33a.
3b may be an independent cushioning member. However, in this case, a structure for holding the cushioning member between the adjacent rotating shaft side engaging portion 31c and the worm shaft side engaging portion 32c is required. Even in this case, effects similar to the effects (1), (4), (6) to (8) of the above embodiment can be obtained.

In the above-described embodiment, the buffer connection section 33
a is a rotating shaft side rotating body 31 and a worm shaft side rotating body 32
Are interposed in the gap for allowing mutual misalignment, but may be changed to be arranged at a position irrelevant to the gap for allowing misalignment. Even in this case, effects similar to the effects (1), (2), (4) to (8) of the above embodiment can be obtained.

In the above embodiment, the rotary shaft side engaging portion 3
Although the number of 1c and the number of the worm shaft side engaging portions 32c are each three, and the number of the buffer portions 33b is six, the numbers may be changed as appropriate. When the number of the rotating shaft side engaging portions and the number of the worm shaft side engaging portions are respectively plural, the number of the buffer portions can be four or more, and the load applied to each of the buffer portions can be reduced.

In the above embodiment, the rotary shaft side engaging portion 3
1c, worm shaft side engaging portion 32c, and buffer portion 33b
Are provided at equal angular intervals, but at least one may be provided at unequal angular intervals. Even in this case, the effects (1) to (4), (5) to
The same effect as (8) can be obtained. Also, for example,
When the direction in which the overload is applied is specified on the output shaft 25 side, the circumferential width of the buffer portion on the side (every other group) that absorbs the shock based on the overload in that direction may be increased. In this way, the shock between the rotating shaft 6 and the worm shaft 23 can be absorbed while reducing waste of the buffer.

In the above embodiment, the integrated cushioning member 33
The (buffer portion 33b) is made of a rubber material, but may be changed to another material. For example, the buffer may be replaced with a coil spring. Also in this case, the impact between the rotating shaft 6 and the worm shaft 23 can be absorbed by the coil spring.

In the above embodiment, the rotation of the worm shaft side rotating body 32 and the sensor magnet 41 is stopped by the two-sided width convex portion 23b of the worm shaft 23. The structure for stopping rotation may be separately configured. Even in this case, effects similar to the effects (1) to (7) of the above embodiment can be obtained.

In the above embodiment, the sensor magnet 41 is fixed to the worm shaft side rotating body 32. However, a rotation detecting member for detecting the rotation of the sensor magnet 41 and the like is replaced by another part of the buffer connecting member 30. (For example, it may be provided (fixed) on the rotating shaft side rotating body 31) for implementation. Also in this case, for example, by previously fixing the sensor magnet (rotation detecting member) to the rotating shaft side rotating body 31, the component management becomes easy.

In the above embodiment, a circular hole 41a is formed in the sensor magnet 41, and the sensor magnet press-fitting portion 32g of the worm shaft-side rotating body 32 is press-fitted into the circular hole 41a so that the sensor magnet 41 and the worm shaft Although the side rotator 32 (worm shaft 23) is fixed, both may be fixed with an adhesive. Even in this case, for example, by previously attaching the sensor magnet to the worm shaft-side rotating body, the component management becomes easy.

In the above embodiment, the buffer connection member 30
Describes that the misalignment between the rotating shaft-side rotating body 31 (the rotating shaft 6) and the worm shaft-side rotating body 32 (the worm shaft 23) is allowed. Even in this case, the effects (1), (2), and
The same effects as (4) to (8) can be obtained.

The technical ideas that can be grasped from the above embodiment will be described below together with their effects. (A) The motor according to any one of claims 2 to 4, wherein the rotating shaft side engaging portion (31c), the worm shaft side engaging portion (32c), and the buffer member (33b).
Wherein a plurality of the motors are provided at equal angular intervals. With this configuration, the rotating shaft side engaging portion, the worm shaft side engaging portion, and the cushioning member are provided in a plurality at equal angular intervals, respectively. Positioning in the circumferential direction at the time of assembly can be performed. Therefore, the assembling work becomes easy.

[0061]

As described in detail above, according to the present invention,
In a motor including a worm and a worm wheel, it is possible to provide a motor capable of improving motor efficiency, reducing uneven wear of a bearing, and reducing the size.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a motor according to an embodiment.

FIG. 2 is an exploded perspective view of the cushioning connection member according to the embodiment.

FIG. 3 is an essential part cross-sectional view of the cushioning connection member of the present embodiment.

FIG. 4 is a bottom view of the rotating shaft side rotating body of the present embodiment.

FIG. 5 is a cross-sectional view of the rotating shaft side rotating body of the present embodiment.

FIG. 6 is a plan view of the integrated cushioning member of the embodiment.

FIG. 7 is a plan view of the worm shaft-side rotating body according to the present embodiment.

FIG. 8 is a cross-sectional view of the worm shaft-side rotating body of the present embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 4 ... Yoke (motor case), 6 ... Rotating shaft, 21 ... Gear housing, 23 ... Warm shaft, 24 ... Worm wheel, 30 ... Buffer connecting member, 31 ... Rotating shaft side rotating body, 32
... worm shaft side rotating body, 41 ... sensor magnet (rotation detecting member), 31c ... rotating shaft side engaging portion, 32c ... worm shaft side engaging portion, 33a ... buffer portion connecting portion (buffer member connecting portion), 33b ... Buffer part (buffer member).

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Takayoshi Aoyama 390 Umeda, Kosai-shi, Shizuoka Prefecture Asmo Co., Ltd. F-term (reference) 3J009 DA11 EA06 EA19 EA23 EA32 EB20 FA03 FA14 5H607 BB01 BB04 BB14 BB26 CC03 DD07 DD19 EE32 EE36 JJ08 KK08

Claims (10)

[Claims] 1. A motor case (4), a rotating shaft (6) supported by the motor case (4) and driven to rotate, a gear housing (21) fixed to the motor case (4), The gear housing (2) is coaxial with the rotation shaft (6).
1) a worm shaft (23) supported by the worm shaft (23), a worm wheel (24) meshed with the worm shaft (23) and connected to the output side, the rotating shaft (6) and the worm shaft (23). And the worm shaft (2) and the worm shaft (2).
And 3) a shock absorbing connecting member (30) for absorbing a shock between the motors. 2. The motor according to claim 1, wherein the shock-absorbing connecting member (30) rotates integrally with the rotating shaft (6) and is engageable in a rotating direction with a rotating shaft side engaging portion (31c). Rotating body (3)
1) a worm shaft-side rotating body (32) having a worm shaft-side engaging portion (32c) that rotates integrally with the worm shaft (23) and can be engaged in the rotation direction; and the rotating shaft-side engaging portion. A motor comprising: a shock-absorbing member (33b) arranged to be rotationally engaged between the worm shaft side engaging portion (32c) and the worm shaft side engaging portion (32c). 3. The motor according to claim 1, wherein the buffer member (33b) is provided between the adjacent rotation shaft side engagement portion (31c) and the worm shaft side engagement portion (32c). A motor provided, wherein each of the buffer members (33b) is connected in a ring shape by a buffer member connecting portion (33a). 4. The motor according to claim 3, wherein the shock-absorbing member connecting portion (33a) has elasticity, and the rotating shaft side rotating body (31) and the worm shaft side rotating body (3).
2) A motor interposed in a gap for allowing mutual misalignment of each other. 5. The motor according to claim 2, wherein a plurality of the rotating shaft side engaging portions (31c) and a plurality of the worm shaft side engaging portions (32c) are provided in the rotating direction. A motor characterized in that: 6. The motor according to claim 5, wherein the rotating shaft side engaging portion (31c) and the worm shaft side engaging portion (32c) are provided at equal angular intervals. . 7. The motor according to claim 1, wherein the rotating shaft (6) and the worm shaft (23) are connected to the motor case (4) and the gear housing (21). On the other hand, the motor is rotatably supported at at least two places on both ends. 8. The motor according to claim 1, wherein the buffer member (33b) is made of a rubber material. 9. The motor according to claim 1, wherein a part of the shock-absorbing connection member (30) is provided with a rotation of the rotation shaft (6) or the worm shaft (23). A motor provided with a rotation detecting member (41) for detecting. 10. A motor case (4), a rotating shaft (6) supported by the motor case (4) and driven to rotate, a gear housing (21) fixed to the motor case (4), The gear housing (2) is coaxial with the rotation shaft (6).
1) a worm shaft (23) supported by the worm shaft (23), a worm wheel (24) meshed with the worm shaft (23) and connected to the output side, the rotating shaft (6) and the worm shaft (23). And the worm shaft (2) and the worm shaft (2).
3) A motor comprising: a buffer coupling member (30) that allows misalignment with the rotation shaft (6) and absorbs an impact between the rotation shaft (6) and the worm shaft (23).