JP6888489B2 - Joint device and motor - Google Patents

Description

The present invention relates to a joint device and a motor.

In a motor or the like in which the rotating shafts are divided and arranged coaxially, the mutual shafts are driven and connected by a joint device.
For example, the motor disclosed in Patent Document 1 is a motor with a deceleration mechanism in which a motor body and a deceleration unit are integrally assembled, and a drive shaft of the motor body and a driven shaft of the deceleration unit (worm shaft in the document) are jointed. It is configured to be connected by a device and transmit the rotational driving force of the drive shaft of the motor body to the driven shaft via the joint device. In addition to the function of transmitting rotational driving force, the joint device also has a function of absorbing axial deviation (parallel deviation and inclination) between both axes.

JP 2015-169225

The joint device includes a drive-side rotating body connected so as to rotate integrally with the drive shaft, a driven-side rotating body connected so as to rotate integrally with the driven shaft, and the like. A two-sided width shape (a shape obtained by removing a pair of parallel planes from a cylinder) is often used for connection and connection between a driven shaft and a driven side rotating body.

For example, in the fitting connection between the two-sided width-shaped connecting portion provided at the tip of the drive shaft and the two-sided width-shaped connecting hole provided on the driving side rotating body, as the use progresses, the inner surface of the connecting hole Is subjected to the rotational load from the connecting portion, and compression deformation (crushing) progresses. Then, rattling occurs between the connecting portion and the connecting hole, which gradually increases, and the axial deviation between the drive shaft and the drive-side rotating body is increased. This can happen on the driven shaft side of the joint device as well.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a joint device and a motor capable of maintaining a shaft connection portion in a stable connection state even if the use progresses. There is.

The joint device for solving the above problems includes a rotating component having a width across flats into which the connecting portion is fitted in order to drive and connect the connecting portion having a width across flats provided at the end of the rotating shaft. a constructed joint device, the connecting portion of the rotary shaft, a pair of flat portions which extends parallel with respect to one having a pair of arcuate portion connecting between the both widthwise ends of each of these planar portions, respectively, the width across flats holes of the rotating part includes a pair of flat portions which extends parallel, and a pair of arcuate portion connecting between the both widthwise ends of each of these planar portions, respectively, each plane of the two surface width hole, A press-fitting portion located on both sides of each of the flat surface portions in the width direction and press-fitting the connecting portion to press-fit each flat surface portion of the connecting portion, and a press-fitting portion located between the press-fitting portions and each flat surface of the connecting portion. It is configured to have a recessed portion that is not in contact with the portion and a regulating protrusion that is located at the center in the width direction of each plane portion of the two-sided width hole and is projected in the recessed portion. ..

According to the above aspect, when the two-sided width hole of the rotating component of the joint device is fitted with the two-sided width-shaped connecting portion of the rotating shaft for drive connection, the width direction of each plane portion of the two-sided width hole is achieved. The press-fitting holding force with the connecting portion is secured at the press-fitting portions provided on both sides (in the direction orthogonal to the axis), and the insertion resistance of the connecting portion is reduced at the recessed portions provided between the press-fitting portions. Here, in the flat portion of the connecting portion that transmits the rotational driving force, the rotational load is larger toward the outer end portion in the width direction, so that the press-fitted portion is more likely to undergo compressive deformation (crushing) toward the outer end portion in the width direction. Further, as the compression deformation of the press-fitting portion progresses, if the displacement of the connecting portion in the direction between the plane portions of the two-sided width hole is added, the compression deformation of the press-fitting portion on the inner end side in the width direction also progresses, and the connecting portion The gap between the and the two-sided width hole expands. Based on this, by providing a regulating protrusion at the center of the flat surface of the two-sided width hole in the width direction, the displacement of the connecting portion of the two-sided width hole in the direction between the flat surfaces can be regulated, and the connecting portion and the two surfaces can be regulated. It is possible to suppress the progress of backlash with the width hole. Further, since the regulation protrusion located at the center of the flat surface portion in the width direction is less likely to receive the rotational load generated in the flat surface portion of the connecting portion and is less likely to undergo compression deformation of itself, the two-sided width hole is formed in the direction between the plane portions. It is possible to regulate the displacement of the connecting portion for a long period of time. Therefore, even if the use of the joint device progresses, it is possible to maintain the shaft connecting portion in a stable connecting state.

In the joint device, the regulation protrusion is configured to have a protrusion height equal to or higher than that of each press-fitting portion.
According to the above aspect, since the regulation protrusion has a protrusion height equal to or higher than that of each press-fitting portion, the direction between the plane portions of the two-sided width hole is from the initial stage of insertion of the connecting portion into the two-sided width hole. It is possible to regulate the displacement of the connecting portion to.

In the joint device, a slope portion whose height gradually increases from the front side to the back side is provided on the front side in the insertion direction of the connection portion in each of the press-fitting portions and the regulation protrusion portion.

According to the above aspect, when the connecting portion is inserted into the width across flat holes, the press-fitting portion and the regulating protrusion are caught by the slope portion provided on the front side in the insertion direction of the connecting portion in each press-fitting portion and the regulating protrusion. It is possible to insert the connecting portion smoothly without any need.

In the joint device, the press-fitting portions located on both side portions in the width direction of each plane portion of the two-sided width hole and the regulation protrusions located at the center portion in the width direction of each plane portion of the two-sided width hole. Each part is composed of one part.
According to the above aspect, since each press-fitting portion and the regulating protrusion portion are each composed of one, it is possible to reduce the complexity of the shape of the two-sided width hole (planar portion) as much as possible.

A motor that solves the above problems is a motor configured to transmit the rotational driving force of the drive shaft generated in the motor body to a driven shaft arranged coaxially with the drive shaft, and the drive shaft and the motor. The above-mentioned joint device is used for a connecting structure with a rotating shaft on at least one side of the driven shaft.

According to the above aspect, since the joint device capable of maintaining the shaft connection portion in a stable connection state is used, it is possible to perform stable rotational drive in the motor for a long period of time.

According to the joint device and the motor of the present invention, the shaft connecting portion can be maintained in a stable connecting state even if the use progresses.

It is a schematic block diagram of the motor of one Embodiment. It is an exploded perspective view of the joint device of the same form. It is sectional drawing of the joint device of the same form, (a) is the figure which shows the drive | drive | drive | drive | connection state of a drive shaft and a worm shaft, (b) is the figure which shows the drive | drive | drive | drive | connection state of a drive shaft and a worm shaft. It is a perspective view which shows the two-sided width connecting part of the joint device of the same form. It is a cross-sectional view perpendicular to the axis of the two-sided width connecting portion of the same form, (a) is a diagram showing an initial state before the axis is inserted, (b) is a diagram showing an initial state after the axis is inserted, and (c) is a state in which the use has progressed. It is a cross-sectional view perpendicular to the axis of the two-sided width connecting portion of the comparative example, (a) is a diagram showing an initial state before the axis is inserted, (b) is a diagram showing an initial state after the axis is inserted, and (c) is a state in which the use has progressed. (A), (b), and (c) are plan views showing the width across flat holes of each of the different examples.

Hereinafter, an embodiment of a motor including a joint device will be described.
As shown in FIG. 1, the motor 10 of the present embodiment has a deceleration mechanism in which the rotational driving force generated in the motor body 11 can be transmitted to the deceleration unit 13 via the joint device 12 and these are integrally assembled. It consists of a motor.

The motor body 11 is configured such that an armature 16 having a drive shaft 15 is housed in the yoke housing 14, and the drive shaft 15 is rotatably supported by a pair of bearings 17 provided in the yoke housing 14. There is. The speed reduction unit 13 includes a worm shaft 22 and a worm wheel 23 that mesh with the worm shaft 22 in a gear housing 21 that is integrally assembled with the yoke housing 14. The worm shaft 22 is rotatably supported by a pair of bearings 24 provided in the gear housing 21 at a coaxial position with the drive shaft 15 of the motor body 11.

The drive shaft 15 and the worm shaft 22 as a driven shaft are drive-connected by a joint device 12 housed in the gear housing 21. Then, the rotational driving force of the drive shaft 15 is transmitted to the worm shaft 22 via the joint device 12, and the rotation of the worm shaft 22 is transmitted to the output shaft (not shown) of the motor 10 via the worm wheel 23. It has become.

As shown in FIGS. 2 and 3, the joint device 12 has a resin drive-side rotating body 30 connected so as to rotate integrally with the drive shaft 15 and a resin connected so as to rotate integrally with the worm shaft 22. The driven side rotating body 40 is provided with a rubber cushioning member 50 interposed between the driving side rotating body 30 and the driven side rotating body 40.

Here, in the connection with the joint device 12, the drive shaft 15 connected to the drive side rotating body 30 is made of metal, and the tip portion is configured as a tip connecting portion 15a having a width across flats. Further, the worm shaft 22 connected to the driven side rotating body 40 is also made of metal, and the base end portion is configured as a base end connecting portion 22a having a width across flats.

The drive-side rotating body 30 includes a connecting shaft portion 31 for connecting to the tip end portion of the drive shaft 15, a disc portion 32 extending radially outward from the connecting shaft portion 31, and a central portion of the disc portion 32. The cylindrical portion 33 projecting on the side opposite to the connecting shaft portion 31 and the three drive-side projecting portions 34 projecting on the peripheral edge portion of the disk portion 32 (diameterally outside of the cylindrical portion 33). Have. The drive-side protrusions 34 are arranged at equal intervals in the circumferential direction and form a substantially T-shape in the axial direction. Each drive-side protrusion 34 has an inner portion 34a located on the inner side in the radial direction and an outer portion 34b located on the outer side in the radial direction and projecting to both sides in the circumferential direction from the inner portion 34a.

The connecting shaft portion 31 has a connecting hole 35 into which the tip portion of the drive shaft 15 including the tip connecting portion 15a is fitted. The connecting hole 35 includes a circular hole 36 corresponding to a columnar portion that is a part of the shaft body of the drive shaft 15 on the front side in the insertion direction of the drive shaft 15, and a tip connecting portion 15a having a width across flats on the back side in the insertion direction. It has a corresponding width across flats 37. A cylindrical portion of a part of the shaft body of the drive shaft 15 is fitted into the circular hole 36 of the connecting hole 35, and a tip connecting portion 15a of the drive shaft 15 is fitted (including press-fitting) into the width across flats 37. To do. As a result, the drive-side rotating body 30 is coaxially and integrally rotatably connected to the drive shaft 15.

The two-sided width hole 37 of the present embodiment will be described in more detail. As shown in the axially orthogonal cross sections of FIGS. 4 and 5, the two-sided width hole 37 has a pair of parallel flat surface portions 37x and each flat surface portion. It has a pair of arc portions 37y connecting both ends in the width direction (orthogonal direction of the axis) of 37x. Each flat surface portion 37x has one press-fitting portion 37a in a range of about 1/4 in the width direction on both sides in the width direction, and a recessed portion 37b in a range of approximately 1/2 in the width direction between the press-fitting portions 37a. Further, a semicircular regulating protrusion 37c is provided at the center of the recessed portion 37b in the width direction, that is, at the center of the flat surface portion 37x in the width direction. Each press-fitting portion 37a is continuously provided in the width direction, and the recessed portion 37b is also continuously provided in the portion other than the regulation protrusion 37c in the width direction. Further, the regulation protrusion 37c is provided at a protruding height equivalent to that of the press-fitting portion 37a. The two-sided width hole 37 has a line-symmetrical shape of the center line in the width direction.

In the depth direction (axial direction) of the width across flat holes 37, each press-fitting portion 37a and the regulating protrusion 37c are provided in a range of approximately 1/2 on the back side in the insertion direction. Further, slope portions 37d and 37e whose heights gradually increase from the front side to the back side are provided so as to be continuous with each press-fitting portion 37a and the regulation protrusion 37c on the front side in the insertion direction. The slope portions 37d and 37e of the press-fitting portion 37a and the regulation protrusion 37c are set at the same point and at the same inclination.

On the other hand, the two-sided width-shaped tip connecting portion 15a of the drive shaft 15 is a pair of parallel flat surface portions 15x and a pair of arcuate portions connecting both ends in the width direction (axis orthogonal direction) of each flat surface portion 15x. It has 15y.

Then, when the tip connecting portion 15a of the drive shaft 15 is fitted (press-fitted) into the two-sided width hole 37, the flat surface portion 15x of the tip connecting portion 15a is guided by the slope portions 37d and 37e of the two-sided width hole 37. Then, it is press-fitted between the press-fitting portions 37a of the flat surface portion 37x. The flat surface portion 15x of the tip connecting portion 15a is in pressure contact with the press-fitting portions 37a on both sides of the flat surface portion 37x of the two-sided width hole 37 in the width direction and the regulation protrusion 37c in the central portion in the width direction, whereas the concave portion 37b is It is non-contact. The press-fitting portion 37a and the regulating protrusion 37c are slightly crushed by pressure contact with the flat surface portion 15x of the tip connecting portion 15a. The two-sided width hole 37 is provided with a recessed portion 37b to reduce the insertion resistance of the tip connecting portion 15a while ensuring a press-fitting holding force with the tip connecting portion 15a at the press-fitting portion 37a. The regulation protrusion 37c is provided to reduce rattling with the tip connecting portion 15a (flat surface portion 15x) even if the use progresses (detailed action will be described later). The arc portion 15y of the tip connecting portion 15a is in contact (or press-fitted) with the arc portion 37y of the width across flat hole 37.

As shown in FIGS. 2 and 3, the driven-side rotating body 40 has a disk portion 42 provided with a connecting hole 41 in the central portion for connecting to the base end portion of the worm shaft 22, and a disk portion 42. It has three driven-side projecting portions 43 projecting at the peripheral edge of the surface facing the driving-side rotating body 30. The connecting hole 41 is composed of a width across flat hole corresponding to the base end connecting portion 22a of the worm shaft 22. The base end connecting portion 22a of the worm shaft 22 is press-fitted into the connecting hole 41 to fit. As a result, the driven side rotating body 40 is coaxially and integrally rotatably connected to the worm shaft 22.

The driven side protrusions 43 are arranged at equal intervals in the circumferential direction. Then, the driven-side rotating body 40 is combined with the driving-side rotating body 30 so that its own driven-side projecting portion 43 and the driving-side projecting portion 34 of the driving-side rotating body 30 alternate in the circumferential direction. At that time, the driven side protrusion 43 and the outer portion 34b of the drive side protrusion 34 can be in direct contact with each other in the circumferential direction, and the driven side protrusion 43 and the inner portion 34a of the drive side protrusion 34 are peripheral to each other. Indirect contact is possible with the buffer member 50 (buffer protrusion 53 described later) interposed therebetween in the direction.

A rubber annular cushioning member 50 is arranged between the discs 32 and 42 of the driving side rotating body 30 and the driven side rotating body 40. The cushioning member 50 has a ring portion 52 provided with a through hole 51 for outer fitting into the cylindrical portion 33 of the drive-side rotating body 30 in the central portion, and a radial outer side of the annular portion 52 at equal intervals in the circumferential direction. It has six cushioning protrusions 53 extending to the surface. Each buffer protrusion 53 does not reach the outer portion 34b of the drive side protrusion 34 in the radial direction, and is interposed between the inner portion 34a of the drive side protrusion 34 and the driven side protrusion 43 in the circumferential direction. .. Even if the shock absorber 50 has an axial deviation (parallel deviation or inclination) between the drive side rotating body 30 that is fitted and connected to the drive shaft 15 and the driven side rotating body 40 that is fitted and connected to the worm shaft 22. It is possible to absorb the gaps set between the rotating bodies 30 and 40 and the cushioning member 50 or the cushioning member 50 itself is elastically deformed.

Further, as shown in FIGS. 3A and 3B, when the rotational driving force is transmitted from the drive shaft 15 to the worm shaft 22, the drive side protrusion 34 and the driven side protrusion 43 rotate in the circumferential direction. The drive transmission is performed by engaging. At that time, the cushioning protrusion 53 of the cushioning member 50 interposed between the inner portion 34a of the driving side protrusion 34 and the driven side protrusion 43 elastically compresses, so that the driving side protrusion 34 and the driven side protrusion 43 The generation of collision noise with is reduced. Further, in the cushioning member 50 (buffering protrusion 53), compression of a predetermined amount or more is restricted by the contact between the outer portion 34b of the driving side protrusion 34 and the driven side protrusion 43, so that the cushioning member 50 is early. It is also reduced that the function deteriorates.

Next, the operation of the connecting portion of the motor 10 with the drive shaft 15 in the joint device 12 will be described.
In the present embodiment, the drive side rotation between the drive shaft 15 shown in FIG. 5 (a) before the tip connecting portion 15a is inserted and the initial state after the tip connecting portion 15a shown in FIG. 5 (b) is inserted (press-fitted). As can be seen from the shape comparison of the two-sided width hole 37 of the body 30, due to the pressure welding of the flat surface portion 15x of the tip connecting portion 15a, the press-fitting allowance is small at each press-fitting portion 37a of the flat surface portion 37x of the two-sided width hole 37. Crushing occurs. Further, a slight crush occurs even in the regulation protrusion 37c having the same protrusion height as the press-fitting portion 37a.

Then, as the use of the motor 10 (joint device 12) progresses, as shown in FIG. 5C, each press-fitted portion 37a receives a rotational load from the flat surface portion 15x of the tip connecting portion 15a and is crushed by compression deformation. I will go. In the case of the present embodiment, the amount of deformation of each press-fitted portion 37a is suppressed toward the inner end portion side as compared with the compression deformation at the outer end portion in the width direction closer to the arc portion 37y.

Here, in the tip connecting portion 15a for transmitting the rotational driving force, the radial side away from the axial center L0, that is, the flat surface portion 15x of the tip connecting portion 15a, the lateral outer end side in the width direction, occurs in the flat surface portion 15x. The rotational load is large. Therefore, each press-fitted portion 37a is more likely to undergo compressive deformation toward the outer end portion in the width direction closer to the arc portion 37y.

However, in the present embodiment, the regulation protrusion 37c is provided at the center of the flat surface portion 37x in the width direction, so that the displacement of the tip connecting portion 15a of the two-sided width hole 37 in the direction between the flat surface portions 37x is restricted. , The compression deformation on the inner end side in the width direction of each press-fitted portion 37a is suppressed. Further, since the regulation protrusion 37c located at the center of the flat surface portion 37x in the width direction is less likely to receive the rotational load generated by the flat surface portion 15x of the tip connecting portion 15a and is less likely to undergo compression deformation of itself, each of the two-sided width holes 37. It is possible to regulate the displacement of the tip connecting portion 15a in the direction between the flat surface portions 37x for a long period of time. As a result, in the present embodiment, the amount of play D1 between the tip connecting portion 15a and the width across flats 37 (the amount of displacement of the tip connecting portion 15a in the direction between each flat surface portion 37x) is suppressed to be small over a long period of time. There is. Unless the regulation protrusion 37c itself is compressed and deformed, the backlash amount D1 is suppressed to substantially zero.

On the other hand, in the comparative examples shown in FIGS. 6A to 6C, the regulation protrusion 37c is omitted. In the initial state from before the insertion of the tip connecting portion 15a shown in FIG. 6A to after the insertion (press fitting) shown in FIG. Occurs. Then, as the use of the motor 10 (joint device 12) progresses, as shown in FIG. 6C, each press-fitted portion 37a undergoes compression deformation on the outer end portion side in the width direction closer to the arc portion 37y.

In addition, in the comparative example in which the regulation protrusion 37c is omitted, the tip connecting portion 15a is allowed to be displaced in the direction between the plane portions 37x of the width across flat holes 37, so that the tip connecting portion is in a state of being displaced. When the rotational load generated by the flat surface portion 15x of 15a is received, the compression deformation of each press-fitting portion 37a on the inner end portion side in the width direction also increases. If the compression deformation of each press-fitting portion 37a on the inner end side in the width direction also progresses, the displacement of the tip connecting portion 15a of the two-sided width hole 37 in the direction between the plane portions 37x is further expanded, leading to a vicious cycle. As a result, in the comparative example, the amount of play D2 between the tip connecting portion 15a and the width across flat hole 37 becomes large at an early stage.

As described above, in the present embodiment, even if the motor 10 (joint device 12) is used, the rattling (axis deviation) between the tip connecting portion 15a and the width across flat hole 37 can be suppressed to be small for a long period of time. It has become. Therefore, it is possible to maintain the connected portion of the joint device 12 (driving side rotating body 30) with the drive shaft 15 in a stable connected state.

Next, the effects of this embodiment will be described below.
(1) In the flat surface portion 15x of the tip connecting portion 15a of the drive shaft 15 for transmitting the rotational driving force, the rotational load is larger toward the outer end portion in the width direction, so that the press-fitted portion 37a in the flat surface portion 37x of the width across flat hole 37 is Compressive deformation (crushing) is more likely to proceed toward the outer end side in the width direction. Further, as the compression deformation of the press-fitting portion 37a progresses, when the tip connecting portion 15a of the two-sided width hole 37 is displaced in the direction between the plane portions 37x, the compression deformation of the press-fitting portion 37a on the inner end side in the width direction is added. Also progresses, and the backlash between the tip connecting portion 15a and the width across flat hole 37 expands.

In the present embodiment, based on this, the regulation protrusion 37c is provided at the center of the flat surface portion 37x of the two-sided width hole 37 in the width direction, so that the tip connecting portion of the two-sided width hole 37 in the direction between each flat surface portion 37x is provided. The displacement of the 15a can be regulated, and the progress of the backlash between the tip connecting portion 15a and the width across flat hole 37 can be suppressed. Further, since the regulation protrusion 37c located at the center of the flat surface portion 37x in the width direction is less likely to receive the rotational load generated by the flat surface portion 15x of the tip connecting portion 15a and is less likely to undergo compression deformation of itself, each of the two-sided width holes 37. The displacement of the tip connecting portion 15a in the direction between the flat surface portions 37x can be regulated for a long period of time. Therefore, even if the use of the joint device 12 progresses, the connected portion between the drive side rotating body 30 and the drive shaft 15 can be maintained in a stable connected state, and the motor 10 can perform stable rotational drive for a long period of time. ..

(2) Since the regulation protrusion 37c has a protruding height equivalent to that of each press-fitting portion 37a, between the flat portions 37x of the two-sided width hole 37 from the initial insertion of the tip connecting portion 15a into the two-sided width hole 37. The displacement of the tip connecting portion 15a in the direction can be regulated.

(3) When the tip connecting portion 15a is inserted into the width across flat holes 37 by the slope portions 37d and 37e provided on the front side in the insertion direction of the tip connecting portion 15a in each press-fitting portion 37a and the regulation protrusion 37c, each press-fitting portion is performed. The tip connecting portion 15a can be smoothly inserted without being caught by the portion 37a and the regulation protrusion 37c.

(4) Since each of the press-fitting portion 37a and the regulating protrusion 37c is composed of one each, it is possible to reduce the complexity of the shape of the two-sided width hole 37 (planar portion 37x) as much as possible.
The above embodiment may be changed as follows.

A semicircular regulating protrusion 37c is provided at the center of the flat surface portion 37x (concave portion 37b) of the two-sided width hole 37 in the width direction, but the shape, number, position, etc. are not limited to this. It may be changed as appropriate.
For example, as shown in FIG. 7A, a rectangular regulation protrusion 37c1 may be used. One regulation protrusion 37c1 is provided at the center of the flat surface portion 37x (recessed portion 37b) in the width direction.

Further, as shown in FIG. 7B, the trapezoidal regulating protrusion 37c2 may be used. One regulation protrusion 37c2 is also provided at the center of the flat surface portion 37x (recessed portion 37b) in the width direction.
Further, as shown in FIG. 7C, three semicircular regulation protrusions 37c3 may be used. One of the regulation protrusions 37c3 is arranged at the center of the flat surface portion 37x (recessed portion 37b) in the width direction, and the remaining two are arranged at equal intervals on both sides thereof.

-Although the regulation protrusion 37c has a protrusion height equivalent to that of the press-fitting portion 37a, the regulation protrusion 37c can be regulated from the initial stage of insertion of the tip connection portion 15a into the width across flat hole 37, so that the regulation protrusion 37c can be regulated. The protrusion height may be set to 37a or more of the press-fitting portion. Further, the protruding height of the regulation protrusion 37c may be set lower than that of the press-fitting portion 37a.

-Other than the above, the shape (configuration) of the width across flats 37 may be changed as appropriate. For example, a plurality of press-fitted portions 37a may be arranged side by side. Further, a press-fitting portion or a recessed portion may be provided in the arc portion 37y of the width across flat hole 37.

-Applied to the connection structure between the tip connecting portion 15a of the drive shaft 15 and the width across flats 37 of the drive side rotating body 30 of the joint device 12, but the base end connecting portion 22a of the worm shaft 22 on the driven shaft side. It may be applied to the connecting structure between the joint device 12 and the connecting hole 41 which is a width across flats hole of the driven side rotating body 40 of the joint device 12.

-The joint device 12 has functions such as transmission of rotational driving force, reduction of shaft deviation, and reduction of collision noise in the drive connection between the drive shaft 15 and the worm shaft 22 which is a driven shaft. A functional joint device may be used. For example, a joint device having a clutch function that locks the rotation of the worm shaft 22 when a force for rotating the worm shaft 22 is applied from the load side while transmitting the rotational driving force from the drive shaft 15 to the worm shaft 22 may be used.

-The configuration of the motor 10 may be changed as appropriate. Although the motor body 11 is not particularly mentioned, it may be composed of a brushed DC motor or a brushless motor. Further, the deceleration mechanism of the deceleration unit 13 is composed of the worm shaft 22 and the worm wheel 23, but the configuration of the deceleration mechanism is not limited to this and may be changed as appropriate.

-Although it was applied to the joint device 12 built in the motor 10, it may be applied to a joint device other than the motor that coaxially drives and connects the two rotating shafts.

11 ... Motor body, 12 ... Joint device, 15 ... Drive shaft (rotating shaft), 15a ... Tip connecting part (connecting part), 15x ... Flat part, 15y ... Arc part, 22 ... Worm shaft (rotating shaft, driven shaft) , 22a ... Base end connecting portion (connecting portion), 30 ... Driving side rotating body (rotating part), 37 ... Width across flats, 37a ... Press-fitting portion, 37b ... Concave portion, 37c ... Regulatory protrusion, 37c1, 37c2 , 37c3 ... Regulatory protrusion, 37d, 37e ... Slope portion, 37x ... Plane portion, 37y ... Arc portion, 40 ... Driven side rotating body (rotating part), 41 ... Connecting hole (width across flats).

Claims (5)

A joint device including a rotating component having a width across flats into which the connecting portion is inserted in order to drive and connect the connecting portion having a width across flats provided at the end of the rotating shaft.
Connecting portion of the rotary shaft, to which has a pair of flat portions which extends parallel, and a pair of arcuate portion connecting between the both widthwise ends of each of these planar portions, respectively,
Two surface width hole of the rotating component has a pair of flat portions which extends parallel, and a pair of arcuate portion connecting between the both widthwise ends of each of these planar portions, respectively,
Each flat surface portion of the two-sided width hole is located on both side portions in the width direction of the flat surface portion, and the press-fitting portion that press-fits the connecting portion to each flat surface portion of the connecting portion and the press-fitting portion of each of the connecting portions. A recessed portion located between the portions and not in contact with each plane portion of the connecting portion, and a regulation located at the center of each plane portion of the two-sided width hole in the width direction and projecting in the recessed portion. A joint device characterized by having a protrusion. In the joint device according to claim 1,
The joint device, wherein the regulation protrusion is configured with a protrusion height equal to or higher than that of each press-fitting portion. In the joint device according to claim 1 or 2.
A joint device characterized in that a slope portion whose height gradually increases from the front side to the back side is provided on the front side in the insertion direction of the connection portion in each of the press-fitting portions and the regulation protrusion portion. In the joint device according to any one of claims 1 to 3.
Each of the press-fitting portions located on both side portions in the width direction of each plane portion of the two-sided width hole and the regulation protrusion located at the center portion in the width direction of each plane portion of the two-sided width hole are 1 respectively. A joint device characterized by being composed of individual pieces. A motor configured to transmit the rotational driving force of a drive shaft generated in the motor body to a driven shaft arranged coaxially with the drive shaft.
A motor according to any one of claims 1 to 4, wherein the joint device according to any one of claims 1 to 4 is used for a connecting structure between the drive shaft and the rotating shaft on at least one side of the driven shaft.

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