JPH0946969A - Electric motor unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an electric motor unit capable of combining rotating forces of a plurality of motors and using them for driving and outputting. SOLUTION: Provided are a drive shaft 2 equipped with an main gear 3 in an intermediate portion, a plurality of motors 4a to 4f are arranged in a circular form around the drive shaft by installing pinions 5a to 5f having the same diameter and being engaged with the main gear respectively, a unit, bracket 6 supporting the drive shaft in a freely rotatable form by 6a, and an unit cover 7 supporting the drive shaft inserted to an inserting hole 7a between the hole 7a and the bracket in a freely rotatable manner.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric motor unit which combines the rotational forces of a plurality of motors and outputs the combined driving force.

[0002]

2. Description of the Related Art Conventionally, a motor is usually used as a single unit, and the idea of combining the torques of a plurality of motors to drive the same driven object has not been generally accepted.

[0003]

However, in recent years, the range to be driven by the motor has been expanding more and more,
The types of motors themselves are DC motors, induction motors, stepping motors, spindle motors,
Vibration wave motor using piezoelectric element such as ultrasonic motor,
There is no choice but to enumerate with minute electrostatic motors, etc., and there are many cases where it is not possible to drive with the conventional motor alone.

Therefore, an object of the present invention is to provide an electric motor unit capable of combining a plurality of motors to combine a rotational force for the purpose of driving the same load and outputting the combined drive.

[0005]

In order to achieve the above-mentioned object, the present invention provides a plurality of motor groups in which a pinion having the same diameter and the same pitch is mounted on a rotary shaft in a circular arrangement around a main gear of a drive shaft. Then, in the same plane orthogonal to the axial direction, each pinion of each motor is configured to mesh with the main gear.

Further, a plurality of motor groups in which pinions having the same diameter and the same pitch are mounted on the rotary shaft are arranged in a horizontal row so that the respective pinions sequentially mesh with each other, and only the rotary shaft of the final motor is projected to drive the drive shaft. Is rotatably fitted in the unit cover and held.

Further, a plurality of motor groups each having a pinion having the same diameter and the same pitch at the front end and a connecting member attached at the rear end are connected in a vertical row by engaging the pinions with the connecting member. I am configuring.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION According to a first aspect of the present invention, there is provided a drive shaft having a main gear mounted in the middle thereof, and a drive shaft having the same diameter which meshes with the main gear. A plurality of motor groups mounted in a circle around the drive shaft by mounting a pinion, a unit bracket that rotatably supports the end of the drive shaft, and the drive shaft that is rotatable between the unit bracket The electric motor unit is provided with a unit cover that holds the unit body to cover the unit body.

According to this structure, it is possible to form a disk-type electric motor unit that combines the rotational forces of a plurality of circularly arranged motors and outputs the combined driving force via the drive shaft.

Another structure for achieving the object of the invention according to the present application is, as described in claim 2, a plurality of motors arranged in a horizontal row so that pinions having the same diameter are mounted and meshed in order. An electric motor unit comprising a group, a drive shaft in which a rotary shaft of a final end motor is extended in an axial direction, and a unit cover that rotatably fits the drive shaft and holds a unit.

According to this structure, it is possible to configure a flat plate type motor unit that combines the rotational forces of a plurality of motors arranged in parallel in a horizontal row to drive and output from the drive shaft of the motor at the final end.

[0012] In another configuration for achieving the object of the invention according to the present application, as described in claim 3, pinions of the same diameter are engaged at the tips of the respective rotating shafts and engaged with the pinions at the next stage at the ends. An electric motor unit is provided with a plurality of motor groups having connecting members mounted therein and connected in a vertical line, and a plurality of oil tanks mounted at respective connecting portions of the motor groups.

According to this structure, it is possible to construct a cylindrical motor unit that combines the rotational forces of a plurality of motors arranged in series in a vertical line to drive and output from the leading edge side.

[0014]

【Example】

(First Embodiment) An embodiment of the present invention will be described below with reference to the drawings. 1 is a perspective view of an electric motor unit according to a first embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a circular electric motor unit that outputs the rotational forces of a plurality of motors by synthesis.
Reference numeral 2 is a drive shaft in the electric motor unit 1, 3 is a main gear mounted on the drive shaft 2, 4 is a plurality of motors constituting the electric motor unit 1, and FIG. 1 shows a case of six constitutions 4a to 4f. (Especially not limited to 6). 5 is a motor 4
Pinions attached to the rotating shafts 4y of a to 4f, 5a each
6 pieces of 5f are shown. 6 is a bracket of the electric motor unit 1, and 7 is a unit cover for holding and covering the unit together with the placket 6.

With the above-mentioned structure, the main shaft 3 is attached to the drive shaft 2.
Is fitted and fixed, and the end side of the drive shaft 2 is rotatably supported by a bearing 6a (sliding bearing, rolling bearing, etc.) provided on the bracket 6. The rotation shafts 4y of the motors 4a to 4f (only the motor 4a is additionally described) are equipped with the pinions 5a to 5f having the same diameter and the same pitch, respectively. Are evenly arranged at 60 ° intervals around the drive shaft 2 (the supporting portion of the motor is not shown). Insertion hole 7 of unit cover 7
The tip end of the drive shaft 2 is rotatably inserted into and abuts on the a, and the unit main body is held and covered by the unit cover 7.

In this state, if the motors 4a to 4f are simultaneously rotated at the same number of revolutions by connecting to the load for driving the drive shaft 2, the combined rotational force of the motors 4a to 4f causes the load to pass through the drive shaft 2. Can be driven.

Thus, the electric motor unit 1 shown in FIG.
Since the entire shape of the can be configured as a disc, it can be used in a way similar to a conventional motor in terms of usage and installation location.

Further, FIG. 2 is a characteristic comparison diagram of the DC motor and the ultrasonic motor. Generally, the DC motor of the electromagnetic motor shown in FIG. 2 (a) rotates at high speed and low due to the electromagnetic induction phenomenon. Although the efficiency increases with torque, the ultrasonic motor using the piezoelectric ceramic shown in Fig. 2 (b), on the contrary, has the characteristic of exhibiting high efficiency at low speed and high torque. The case of a sonic motor is more effective.

On the other hand, in the case of an electromagnetic motor, it is almost always used in an efficient, high-speed rotation and low torque state.
The effect of the torque synthesis of the present invention is not so remarkable as in the case of the ultrasonic motor during steady low torque and high speed rotation. However, due to the characteristic that the loss increases at low speeds, it is possible to fully anticipate the effect of supplementing the rotating force when starting or when low speed driving is required, or when the rotating force decreases due to fluctuations of the motor or the load side even during steady rotation. be able to.

As described above, although the present invention has different effects depending on the type of motor, by selecting and configuring the type and number of motors according to the respective purpose, it is possible to change from the DC motor to the vibration wave motor to the electrostatic wave. It can be applied to all torque control type motors including motors. (Second Embodiment) FIG. 3 is a perspective view of an electric motor unit according to a second embodiment of the present invention. FIG. 3A is a perspective view of a main part of the electric motor unit, and FIG. 3B is a perspective view of the electric motor unit in the horizontal layout example. FIG. 4 is a perspective view showing a vertical layout example of the electric motor unit shown in FIG.

In the second embodiment shown in the drawing, as shown in FIG. 3A, the motors 4a to 4e are arranged side by side in parallel so that the respective pinions 5a to 5e mesh with each other in sequence.
As shown in (b), the drive shaft 2a is inserted into the insertion hole of the unit cover 7b to hold the unit. It should be noted that although five motors 4a to 4e are illustrated, the number of motors is not limited to five. Further, the holding mechanism portion of the unit including each motor support portion of the unit cover 7b is not shown.

In the second embodiment thus constructed, for example, as shown in FIG. 3A, the motor 4a is rotated clockwise, the motor 4b is rotated counterclockwise, and the motor 4c is rotated counterclockwise.
When the motor 4d is rotated clockwise, the motor 4d is rotated counterclockwise, and the motor 4e is rotated clockwise, the combined rotational force in the clockwise direction can be output from the drive shaft 2a. In this case, the motor 4
If the rotation direction of a is counterclockwise, the drive output of the unit can be counterclockwise.

The second embodiment has the same effects as the previous embodiment, and as shown in FIG. 3 (b), since a flat plate type motor unit 1a having a reduced height can be constructed, a space in the height direction is formed. It is suitable for arranging in a place where is limited. 4 is a vertical arrangement example in which the unit of FIG. 3 is set up, and is suitable for a place where there is a margin in the height direction and a space in the width direction is limited. (Third Embodiment) FIG. 5 is a perspective view of an electric motor unit according to a third embodiment of the present invention. FIG. 5 shows a perspective view of the same electric motor unit 1b viewed from the front left and the front right. The third embodiment shown in FIG. 5 is an example in which the motors 4a to 4e are arranged in series in a vertical line, whereas the motors in the second embodiment are arranged in a horizontal line in parallel, and a pinion is provided at the tip like a motor 4e. An internal gear joint 8e, which is a connecting member that engages with the pinion 5d of the next-stage motor 4d, is mounted at the end of 5e, and an oil tank 9 for supplying lubricating oil having oil packings 10 at the connecting portions respectively. Is inserted.

In this case, when the motors 4a to 4e are simultaneously rotated in the clockwise direction as indicated by arrows, for example, the clockwise combined rotational force can be output via the pinion 5e of the motor 4e at the tip.

The third embodiment has the same effect as that of the first embodiment, and since it can be formed into a tubular shape, there is no space in the depth and width directions, and there is only a vertically elongated space. It is optimal for placement in a place where there is no space in the height and width directions and only a long and narrow space can be taken.

[0026]

According to the first aspect of the present invention, a plurality of motor groups in which a drive shaft on which a main gear is mounted and a pinion of the same diameter that meshes with the main gear are mounted and which are arranged in a circle around the drive shaft are provided. And a unit bracket that rotatably supports the drive shaft, and a unit cover that rotatably holds the drive shaft between the unit bracket, so that it is a disk type that combines the rotational forces of multiple motors to output the drive. The electric motor unit can be configured.

According to the second aspect of the present invention, a plurality of motor groups are arranged in a horizontal row so that pinions of the same diameter are mounted and meshed in order, and a drive shaft in which the rotary shaft of the end motor is extended. Since the unit cover for holding the unit is provided, it is possible to configure a flat plate type motor unit that combines the rotational forces of a plurality of motors arranged in a row and outputs the combined driving force.

According to the third aspect of the present invention, a plurality of motor groups connected in a vertical line and a connecting member for connecting the pinion to the tip of the rotary shaft and a pinion to the end of the rotary shaft are attached to each connecting portion. With multiple oil tanks,
It is possible to configure a vertically long, cylindrical electric motor unit that combines the rotational force of each motor and outputs the combined driving force.

[Brief description of drawings]

FIG. 1 is a perspective view of an electric motor unit according to a first embodiment of the present invention.

FIG. 2 is a comparison diagram of characteristics of the DC motor and the ultrasonic motor of the present invention.

FIG. 3 is a perspective view of an electric motor unit according to a second embodiment of the present invention.

FIG. 4 is a perspective view of a vertical layout example of the electric motor unit shown in FIG.

FIG. 5 is a perspective view of an electric motor unit according to a third embodiment of the present invention.

[Explanation of symbols]

 1 electric motor unit 2 drive shaft 3 main gear 4 motor 5 pinion 6 unit bracket 7 unit cover 8 connecting member 9 oil tank

Claims (3)

[Claims] 1. A drive shaft having a main gear mounted in the middle, a plurality of motor groups having circularly arranged pinions of the same diameter that mesh with the main gear and arranged around the drive shaft, and the drive unit. An electric motor unit comprising: a unit bracket that rotatably supports a terminal end of a shaft; and a unit cover that rotatably holds the drive shaft between the unit bracket and the unit cover. 2. A plurality of motor groups arranged in a horizontal row so that pinions of the same diameter are mounted and meshed in order, a drive shaft in which a rotary shaft of a final end motor is axially extended, and the drive. An electric motor unit comprising a unit cover that rotatably fits a shaft and holds the unit. 3. A plurality of motor groups, each of which has a pinion of the same diameter attached to the tip of each rotating shaft and a connecting member which engages with a pinion of the next stage at the end thereof, are connected in a vertical line, and each of the motor groups. An electric motor unit comprising a plurality of oil tanks that are inserted and attached to the connecting portion.