JP2021179254A - Single drive part support plate - Google Patents

Abstract

To provide a single drive part support plate for a rotary valve which enables reduction of the number of components and assembly work hours and downsizing and enables a motor side gear (for example, a worm) to engage with an engaged gear (for example, a worm wheel) easily and properly during assembly.SOLUTION: A single drive part support plate includes: a motor 15; and a reduction gear train 40 for transmitting rotational driving force of the motor 15. Further, the motor 15 and the reduction gear train 40 are assembled, an upper surface is covered with a cover 45, and a shaft fitting hole 32, in which an intermediate shaft part 22 of a valve body 20 may be rotatably fitted, is provided on a bottom surface. The reduction gear train 40 comprises: a first wheel provided at an output shaft of the motor 15; a gear train which engages with the first wheel; and a second wheel which engages with the gear train. A rotation axis of the second wheel is provided coaxially with the shaft fitting hole 32. A rotation axis of the motor 15 and the rotation axis of the second wheel are spaced a predetermined distance apart from each other and arranged in parallel to each other.SELECTED DRAWING: Figure 6

Description

INDUSTRIAL APPLICABILITY The present invention has various forms such as a flow path switching valve (multi-way valve), a flow rate adjusting valve, a pressure control valve, an on-off valve, etc., in which a valve body is rotated by a motor via a transmission mechanism consisting of a reduction gear train. With respect to the rotary valve used in, in particular a single drive support plate used in a rotary valve suitable for use in systems where the flowing fluid is hot water, hot water or cooling water.

As described in Patent Document 1, for example, this type of rotary valve is provided with a motor unit including a motor and a reduction gear train, a valve chamber and a plurality of ports, and the valve body rotates in the valve chamber. Generally, the freely arranged valve housing (valve body) is manufactured separately, and then the motor unit is assembled to the valve housing.

However, the rotary valve having such a configuration requires a member for supporting the rotating portion and a member for connecting them to each other on the motor unit side and the valve housing side, respectively, and it is disliked that the total number of parts and assembly man-hours increase. At the same time, there is a problem that it is difficult to reduce the size.

Therefore, some rotary valves have a motor, a reduction gear train, or the like incorporated in the valve housing.

Japanese Unexamined Patent Publication No. 2001-294717

However, it is known that a conventional rotary valve in which a motor, a reduction gear train, or the like is incorporated in a valve housing has the following problems.

That is, in the conventional rotary valve, the motor in which the gear is externally fitted and fixed to the output shaft and some of the gears constituting the reduction gear train are assembled on different support plates, and the support plate to which the motor is assembled is assembled in the valve housing. After mounting on the valve housing, a support plate with some of the gears that make up the reduction gear train is mounted on the valve housing. It is presumed that this is done mainly for the convenience of meshing between the gear on the motor side (for example, worm) and the gear that meshes with it (for example, worm wheel), but the support plate that supports the motor And the support plate that supports (a part of) the gear train are different, and they are individually attached to the valve housing, so the number of parts and assembly man-hours may increase.

The present invention has been made in view of the above problems, and an object thereof is to reduce the number of parts and assembly man-hours, to reduce the size, and to reduce the size of the gears (for example, worms) on the motor side at the time of assembly. ) And a gear (eg, a worm wheel) that meshes with it can be easily and properly meshed to provide a single drive support plate for a rotary valve.

In order to achieve the above object, the single drive unit support plate according to the present invention basically includes a motor and a transmission mechanism for transmitting the rotational driving force of the motor, and the motor and the motor. With a single drive unit support plate that is assembled with the transmission mechanism, the upper surface is covered with a cover, and a shaft fitting insertion hole is provided on the bottom surface into which the intermediate shaft portion of the valve body can be rotatably fitted. The transmission mechanism is composed of a first wheel provided on the output shaft of the motor, a gear train that meshes with the first wheel, and a second wheel that meshes with the gear train. The rotation axis of the wheel is provided coaxially with the shaft fitting hole, and the rotation axis of the motor and the rotation axis of the second wheel are arranged in parallel with each other at a distance of a predetermined distance. It is supposed to be.

In a preferred embodiment, the motor and the second wheel are assembled to the bottom surface of the single drive unit support plate so that the rotation axis of the motor and the rotation axis of the second wheel face in the vertical direction.

In another preferred embodiment, the wiring is connected to the motor and drives the motor to rotate, and a plurality of columns supporting the wiring are further provided.

In the single drive unit support plate according to the present invention, the motor, the valve body, and the transmission mechanism (for example, the reduction gear train) are directly assembled to the single drive unit support plate, and the drive unit support plate is attached to the valve housing. The motor and the valve body are assembled on the lower surface side of a single drive unit support plate to be fixed, and the transmission mechanism is assembled on the upper surface side thereof, and the drive unit support plate, that is, the motor and the transmission mechanism. A unit including a valve body is housed in a valve housing, and the drive unit support plate is placed and fixed on a mounting surface provided on the valve housing so that a rotary valve can be assembled. Therefore, the number of parts and assembly are compared to the conventional one in which the motor unit is assembled to the valve housing and the one in which the motor and some of the gears constituting the reduction gear train are assembled to different support plates. The number of man-hours can be reduced and the size can be reduced.

Further, since a slit-shaped notch is formed between the through hole of the output shaft of the motor in the drive unit support plate and the outer end surface, the drive unit support plate is in a posture in which the output shaft of the motor is facing upward. A gear (for example, a worm) provided on the output shaft is moved laterally from the side to the through hole, and a gear (for example, a worm) provided on the output shaft is finely adjusted in its vertical and rotational positions. ) Can be engaged from the side with a gear (for example, a worm wheel) supported by the drive unit support plate, so that both can be easily and appropriately engaged.

The whole perspective view which shows the appearance of one Embodiment of the rotary valve which concerns on this invention. FIG. 3 is a perspective view showing a state in which the cover of the rotary valve of the above embodiment is removed. FIG. 1 is a cross-sectional view taken along the line of sight of the XX arrow in FIG. FIG. 1 is a cross-sectional view taken along the line of sight of the arrow YY in FIG. The perspective view which shows the drive part support plate of the said one Embodiment. The perspective view which shows the state which the motor, the valve body, and the reduction gear train are assembled with the drive part support plate of the said one Embodiment. The perspective view mainly provided for the description of the component assembly procedure (1) of the rotary valve of the above-mentioned embodiment. The perspective view mainly provided for the description of the component assembly procedure (2) of the rotary valve of the above-mentioned embodiment. The perspective view mainly provided for the description of the component assembly procedure (3) of the rotary valve of the above-mentioned embodiment. The perspective view mainly provided for the description of the component assembly procedure (4) of the rotary valve of the above-mentioned embodiment. The perspective view mainly provided for the description of the component assembly procedure (5) of the rotary valve of the above-mentioned embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is an overall perspective view showing the appearance of an embodiment of the rotary valve according to the present invention, FIG. 2 is a perspective view showing a state in which the cover of the rotary valve is removed, and FIGS. 3 and 4 are FIGS. 1, respectively. It is sectional drawing which follows the XX, YY arrow line of sight. In this specification, the description indicating the position and direction such as up / down, left / right, front / back, etc. is based on the direction arrow display of FIGS. 1 and 2, and does not indicate the position / direction in the actual usage state. ..

The rotary valve 1 of the illustrated embodiment is used as a flow path switching valve (three-way valve) in a system in which the flowing fluid is hot water, hot water, or cooling water, such as a hot water supply facility, and is basically a motor. 15 (FIG. 6), a valve body 20 (FIG. 6) in which the rotational driving force of the motor 15 is transmitted via a reduction gear train (transmission mechanism) 40 described later, and a motor chamber 16 (FIG. 6) in which the motor 15 is housed. A valve housing 10 having an open upper surface and a valve housing 10 having an open upper surface and a valve chamber 12 (FIGS. 3 and 11) in which the valve body 20 and the valve body 20 are rotatably accommodated are provided in the lower half thereof, and a motor in the valve housing 10. A single (consisting of one member) placed on the mounting surface 14 which is the upper surface of the chamber 16 and the valve chamber 12 and fastened and fixed to the valve housing 10 with the tapping screws 38 and 38 (FIGS. 2 and 3). It has a drive unit support plate 30 and a cover 45 that is covered so as to cover the upper surface opening of the valve housing 10 and is fastened and fixed by a predetermined number of set screws 19.

Specifically, the valve housing 10 has a cylindrical body portion 11 having a valve chamber 12 formed therein and having outflow ports p1 and p2 made of joints on the right side and the front side of the outer peripheral portion thereof, respectively. On the upper surface side of the cylindrical body portion 11, a valve body 20 (cylindrical valve body portion 21) held in the shaft fitting insertion hole 32 of the drive unit support plate 30 is inserted into the valve chamber 12 from above. A circular opening 17 (FIGS. 3 and 11) is formed.

Further, in the stepped cylindrical portion of the cylindrical body portion 11 of the valve housing 10 below the valve chamber 12, a lower port member 18 having an inflow port p3 made of a joint having an open upper surface is interposed therein as an O-ring member. The ring 39 is sandwiched and internally fitted and fixed by ultrasonic welding or the like.

A cylindrical rubber sealing member 27 having a plurality of oval openings 28 formed at predetermined angular intervals on the outer periphery of the valve chamber 12 is provided before the lower port member 18 is internally fitted and fixed. It is inserted from the lower side and fixed by an appropriate method in order to prevent the valve body 20 from rotating. On the inner peripheral side of the rubber sealing member 27, the cylindrical valve body portion 21 of the valve body 20 is pushed in from above through the circular opening 17, that is, to seal with the rubber sealing member 27. The rubber seal member 27 is interpolated so as to be slidable and rotatable while compressing the rubber seal member 27 to the extent that a necessary compression allowance can be secured.

On the other hand, in the present embodiment, as shown in FIG. 6, the rotation axis O'of the motor 15 and the rotation axis O of the valve body 20 are arranged in parallel with each other at a predetermined distance from each other, and the valve housing 10 A square tubular body portion 13 having a motor chamber 16 formed therein is provided on the left rear side of the above.

Further, the reduction gear train 40 interposed between the motor 15 (output shaft 15A) and the valve body 20 (upper shaft portion 23) may refer to FIGS. 2, 6, 10, and the like. As can be seen, a first worm gear train including a first worm 41 (fixed to the outside) provided on the output shaft 15A of the motor 15 and a first worm wheel 42 meshing with the first worm 41, and the first worm wheel 42. A second worm gear train including a second worm 43 provided on the rotating shaft portion 42A of the above and a second worm wheel 44 externally fitted and fixed to an upper shaft portion 23 (described later) of the valve body 20 that meshes with the second worm 43. The reduction ratio is, for example, about 1/100.

Then, on the lower surface side of the drive unit support plate 30, the motor 15 has a drive unit support plate on the upper end surface of the main body portion 15B, as can be easily understood by referring to FIGS. 2, 5, 6, 10, and the like. The set screw 37, which is pressed against the lower surface of the 30 and screwed from above with the first worm 41 provided on the output shaft 15A (FIG. 10) protruding toward the upper surface side from the through hole 35 (FIG. 5). It is mounted and fixed by 37.

Further, in order to facilitate the assembly of the motor 15 (and the reduction gear train 40) to the drive unit support plate 30, in other words, the engagement between the first worm 41 and the first worm wheel 42, the drive unit support plate 30 is used. As shown in FIGS. 5 and 6, between the through hole 35 of the output shaft 15A of the motor 15 and the outer end surface, the motor 15 is in a posture in which the output shaft 15A to which the first worm 41 is fixed faces upward. A slit-shaped notch 36 is formed to laterally move the drive portion support plate 30 from the side to the through hole 35.

Further, on the upper surface side of the drive unit support plate 30, there is a bearing groove 33a having a semicircular cross section on the bottom surface and an open top surface, which rotatably supports both ends 42a and 42a of the rotation shaft portion 42A of the first worm wheel 42. A pair of columnar bearing portions 33, 33 provided are projected upward. Here, as shown in FIG. 4, the upper end surface of the columnar bearing portion 33 (bearing groove 33a) is substantially flush with or slightly above the upper end surfaces (top surfaces) of both end portions 42a and 42a of the rotary shaft portion 42A. It is designed to be located in. Further, as shown in FIG. 4, the cover 45 has both end portions 42a of the rotary shaft portion 42A rotatably supported by the bearing grooves 33a, 33a of the columnar bearing portions 33, 33 provided in the front-rear direction. In order to prevent the 42a from rising, a pair of columnar holding portions 46, 46 having a hollow inside, whose lower end surface is in contact with the upper end surfaces of the columnar bearing portions 33, 33, are projected downward. In other words, the columnar bearing portions 33, 33 provided on the drive unit support plate 30 and the columnar holding portions 46, 46 provided on the cover 45 form the rotating shaft portions 42A of the first worm wheel 42 and the second worm 43. Supporting bearings are configured.

Further, on the right front side of the through hole 35 in the drive unit support plate 30, a predetermined meat projecting up and down of the substrate portion 31 as can be clearly seen by referring to FIGS. 5 and 7 in addition to FIG. A shaft fitting insertion hole 32 composed of a thick cylindrical portion is provided.

On the other hand, the valve body 20 has a cylindrical valve body portion 21 in which oval openings are formed at intervals of 90 ° on the peripheral surface, and the valve body portion 20 is projected onto the cylindrical valve body portion 21 and has a shaft fitting hole. A second worm that is rotatably inserted into 32 and has a diameter smaller than that of the cylindrical valve body portion 21 and is projected onto the intermediate shaft portion 22 to form the final stage of the reduction gear train 40. The second worm wheel 44 has a cross-section race track type upper shaft portion 23 and a D-shaped protrusion 24 to which the wheel 44 is fitted and fixed by press fitting or the like, and as can be clearly seen with reference to FIG. On the lower surface of the cylinder, the upper end step hill surface of the cylindrical valve body portion 21, and the upper end surface and the lower end surface of the shaft fitting insertion hole 32, the valve body 20 is prevented from coming off with respect to the drive portion support plate 30 and the position is restricted in the vertical direction.

An O-ring 26 as a sealing member is interposed between the intermediate shaft portion 22 of the valve body 20 and the inner peripheral surface of the shaft fitting hole 32 in two stages, and is a circular shape formed on the valve chamber 12. An O-ring 34 as a sealing member is also interposed between the opening 17 (inner peripheral surface) and the outer peripheral surface of the shaft fitting hole 32. Further, here, the diameter of the circular opening 17 is substantially the same as the outer diameter of the cylindrical valve body portion 21 in the valve body 20 and the outer diameter of the cylindrical portion of the shaft fitting hole 32, or the cylindrical valve body portion 21 in the valve body 20. The outer diameter of the shaft and the outer diameter of the cylindrical portion of the shaft fitting hole 32 are slightly smaller than the outer diameter of the cylinder.

Further, in order to support and hold the printed wiring board 54 (FIG. 3), the drive unit support plate 30 has three columns 53 with small-diameter convex portions (around the rotating shaft portion 42A of the first worm wheel 42). In addition to being erected, six small-diameter convex portions 56 are also erected on the valve housing 10 (the left front portion in the valve housing 10).

Further, as can be clearly seen with reference to FIGS. 2 to 4, an annular shape formed on the outer peripheral upper end surface of the valve housing 10 in order to seal between the outer peripheral upper end surface of the valve housing 10 and the outer peripheral lower end surface of the cover 45. A rubber packing 47 as a sealing material having an endless ring in the groove is attached.

Next, referring to FIGS. 7 to 11, the procedure for assembling the motor 15, the reduction gear train 40, and the valve body 20 to the drive unit support plate 30, and the attachment of the drive unit support plate 30 to the valve housing 10 are performed. explain.

(1) First, as shown in FIG. 7, the O-rings 26 and 26 are mounted on the outer periphery (two annular grooves) of the intermediate shaft portion 22 of the valve body 20, and the O-rings 26 and 26 are mounted on the drive portion support plate 30. The O-ring 34 is mounted on the outer periphery (annular groove provided in) of the protrusion on the lower surface side in the shaft fitting insertion hole 32 formed of the provided cylindrical portion. Next, as shown in FIG. 8, the intermediate shaft portion 22 of the valve body 20 is pushed into the shaft fitting insertion hole 32, and the upper shaft portion 23 having a cross-section race track shape is projected above the shaft fitting insertion hole 32.

(2) Subsequently, as shown in FIGS. 8 and 9, the rearmost stage of the reduction gear train 40 provided with a fitting hole 44a that can be externally fitted (press-fitted) into the upper shaft portion 23. The constituent second worm wheel 44 is externally fitted and fixed by press fitting or the like. As a result, as described above, the valve body 20 (and the second worm wheel 44) is assembled to the drive unit support plate 30 in a rotatably and retaining state.

(3) Next, as shown in FIGS. 9 and 10, both ends 42a and 42a of the rotating shaft portion 42A of the first worm wheel 42 are moved upward to the bearing grooves 33a and 33a of the columnar bearing portions 33 and 33. I will put it in and accept it. At that time, the positions (rotation direction, vertical direction) of the second worm wheel 44 externally fitted and fixed to the upper shaft portion 23 of the valve body 20 and the second worm 43 provided on the rotation shaft portion 42A of the first worm wheel 42. Engage them while fine-tuning. In this case, both the second worm wheel 44 and the second worm 43 can be moved to some extent, so that they can be easily and appropriately engaged.

(4) Subsequently, as shown in FIGS. 10 and 6, the motor 15 is placed at the lower part of the output shaft 15A (first worm 41) in a posture in which the output shaft 15A provided with the first worm 41 faces upward. (Small diameter portion exposed from) is inserted into the slit-shaped notch 36 from the side of the drive portion support plate 30, and the motor 15 with the first worm 41 is laterally moved to the through hole 35, and its position (rotational direction, vertical direction). ) Is finely adjusted, and the first worm 41 is engaged with the first worm wheel 42 from the side. In this case, both the first worm 41 and the first worm wheel 42 can be moved to some extent, so that they can be easily and appropriately engaged. When the meshing is completed, the set screws 37 and 37 are screwed into the motor 15 (main body portion 15B) from above the drive unit support plate 30 (through the insertion hole provided in the drive unit support plate 30), and the motor 15 (main body portion 15B) is screwed into the motor 15 (through the insertion hole provided in the drive unit support plate 30). The upper end surface of the main body portion 15B) is mounted and fixed in a state of being pressed against the lower surface of the drive portion support plate 30. As a result, the assembly of the motor 15, the reduction gear train 40, and the valve body 20 to the drive unit support plate 30 is completed (the state shown in FIG. 6).

(5) Next, as shown in FIG. 11, a drive unit support plate 30 to which the motor 15, the reduction gear train 40, and the valve body 20 are assembled is provided, and the valve housing provided with the motor chamber 16 and the valve chamber 12. It is placed on the mounting surface 14 which is the upper surface of the motor chamber 16 and the valve chamber 12 so as to drop into the 10 from above, and is fastened and fixed to the valve housing 10 with the tapping screws 38 and 38 (FIGS. 2 and 3). As a result, the main body portion 15B of the motor 15 and the cylindrical valve body portion 21 of the valve body 20 are housed in the motor chamber 16 and the valve chamber 12 defined in the substantially lower half of the valve housing 10, respectively.

(6) Next, a cover 45 is covered so as to cover the upper surface opening of the valve housing 10 and tightened and fixed with a set screw 19 (FIGS. 1, FIG. 3, and FIG. 4). Here, an annular groove is formed on the upper end surface of the outer periphery of the valve housing 10, and a rubber packing 47 is mounted in the annular groove with a part thereof protruding upward, and the cover 45 is fastened to the valve housing 10. When fixed, as shown in FIGS. 3 and 4, the rubber packing 47 is sandwiched between the outer peripheral upper end surface of the valve housing 10 and the outer peripheral lower end surface of the cover 45 facing the outer peripheral upper end surface, and is also covered. The lower end surface of the columnar holding portion 46 provided on the 45 comes into pressure contact with the upper end surface of the columnar bearing portion 33. As a result, the positions of both end portions 42a and 42a of the rotation shaft portion 42A on the first worm wheel 42 in the vertical direction are restricted. In other words, the columnar bearing portions 33, 33 provided on the drive unit support plate 30 and the columnar holding portions 46, 46 provided on the cover 45 form the rotating shaft portions 42A of the first worm wheel 42 and the second worm 43. A bearing to be supported is configured, and the first worm wheel 42 and the second worm 43 are appropriately rotatably supported without the need for a separate shaft holding member or the like.

As can be understood from the above description, in the rotary valve 1 of the present embodiment, the motor 15, the valve body 20, and the reduction gear train 40 as the transmission mechanism are directly connected to the single drive unit support plate 30 made of one member. At the same time as being assembled, the drive unit support plate 30 is fixed to the valve housing 10. In particular, the motor 15 (main body 15B) and the valve body 20 (cylindrical valve body 21) are arranged on the lower surface side of the single drive unit support plate 30, and the reduction gear train 40 is arranged on the upper surface side thereof. Is assembled, and the drive unit support plate 30, that is, a unit including a motor 15, a reduction gear train 40, and a valve body 20 is housed in the valve housing 10, and the drive unit support plate 30 is provided in the valve housing 10. Since the rotary valve 1 can be assembled by mounting and fixing it on the mounting surface 14, the motor unit and the valve housing assembled separately can be assembled as in the conventional case. Compared to the motor and some of the gears that make up the reduction gear train, which are assembled to different support plates and then individually attached to the valve housing, the number of parts and assembly steps can be reduced, and the size can be reduced. be able to.

Further, since the slit-shaped notch 36 is formed between the through hole 35 of the output shaft 15A of the motor 15 and the outer end surface, the drive unit support plate 30 is placed with the motor 15 facing the output shaft 15A upward. The first worm 41 is moved laterally from the side of the wheel to the through hole 35, and the position of the first worm 41 provided in the output shaft 15A in the vertical direction and the rotational direction is finely adjusted, and the first worm 41 is moved to the columnar bearing portions 33, 33. Since it is possible to engage with the first worm wheel 42 supported by the above from the side, when the first worm 41 and the first worm wheel 42 are engaged and assembled after the motor 15 is attached to the drive unit support plate 30. Compared with, it can be easily and properly meshed.

Further, the columnar bearing portions 33, 33 provided on the drive portion support plate 30 and the columnar holding portions 46, 46 provided on the cover 45 do not require a separate shaft holding member or the like, and the first worm wheel Since the 42 and the second worm 43 are appropriately rotatably supported, the number of parts and the number of assembly steps can be reduced.

In the above embodiment, the reduction gear train 40 is composed of two sets of worm gear trains, but the configuration of the reduction gear train 40 as the transmission mechanism is not limited to that of the above embodiment, of course. Is. Further, the rotary valve 1 of the above embodiment is configured to function as a three-way valve having one inflow port and two outflow ports, but the rotary valve is a multi-way switching valve (flow path switching) such as a three-way valve. In addition to the valve), a flow rate adjusting valve, a pressure control valve, an on-off valve, or the like may be used as long as the valve body is rotated by a motor via a transmission mechanism.

Further, the rotary valve 1 of the above embodiment is used as a three-way valve for switching a flow path in a hot water supply facility. For example, in a cooling water circuit (engine cooling circuit, electronic device cooling circuit, etc.) in a vehicle. It may be used as a rotary valve for switching the flow path.

1 Rotary valve 10 Valve housing 11 Cylindrical body 12 Valve chamber 14 Mounting surface 15 Motor 15A Output shaft 16 Motor chamber 17 Circular opening 18 Lower port member 20 Valve body 21 Cylindrical valve body 22 Intermediate shaft 23 Upper shaft 25 Open 27 Rubber seal member 30 Drive part support plate 32 Shaft fitting insertion hole 33 Columnar bearing part 33a Bearing groove 35 Through hole 36 Slit-shaped notch part 40 Reduction gear train (transmission mechanism)
41 1st worm 42 1st worm wheel 42A Rotating shaft part 43 2nd worm 44 2nd worm wheel 45 Cover 46 Columnar holding part 47 Rubber packing (sealing material)
p1 Outflow port p2 Outflow port p3 Inflow port

Claims (3)

It has a motor and a transmission mechanism for transmitting the rotational driving force of the motor, and the motor and the transmission mechanism are assembled, the upper surface is covered with a cover, and the intermediate shaft portion of the valve body is rotatable. A single drive support plate with a shaft fitting hole on the bottom that can be fitted.
The transmission mechanism includes a first wheel provided on the output shaft of the motor, a gear train that meshes with the first wheel, and a second wheel that meshes with the gear train.
The rotation axis of the second wheel is provided coaxially with the shaft fitting hole.
A single drive unit support plate characterized in that the rotation axis of the motor and the rotation axis of the second wheel are arranged in parallel with each other at a distance of a predetermined distance. The motor and the second wheel are assembled to the bottom surface of the single drive unit support plate so that the rotation axis of the motor and the rotation axis of the second wheel face in the vertical direction. The single drive unit support plate according to claim 1. Wiring that is connected to the motor and drives the motor to rotate,
The single drive unit support plate according to claim 1 or 2, further comprising a plurality of columns for supporting the wiring.

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