JP2003014060A - Electrically driven roller for conveying heavy product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To mount a roller even in a narrow space, to lighten and miniaturize an entire moving device of a heavy product, and facilitate handling. SOLUTION: A ball bearing 60 of a wave generator 58 is disposed inside the opening end of a thin cup like flexible spline 62 having flexibility having a plurality of teeth in its outer periphery, the tooth part of the outer periphery is deformed into an elliptical shape, tooth parts near both ends of the major axis side of the flexible spline 62 are fitted to a tooth part in the inner periphery of a circular spline 64 having slightly more teeth than that of the flexible spline 62, and a harmonic drive type speed reduction mechanism 33 is constituted. Rotation of the wave generator 58 rotated by a driving source 21 via a first shaft 46A rotates a drive roller 31 with a driving force outputted as a reduction rotation from the circular spline 64.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to an electric roller for conveying a heavy load, which is used for carrying in and out of a heavy load such as a large transformer, a large machine tool, and an air conditioner, and a reduction mechanism thereof. The present invention relates to an improved electric roller for conveying heavy goods.

[0002]

2. Description of the Related Art Conventionally, when moving various kinds of heavy goods, for example, an electric roller for carrying heavy goods has been used which moves the heavy goods directly by moving them directly. The electric drive roller that drives the electric roller itself for transporting heavy goods is driven by decelerating the rotation output from a built-in motor used as a drive source during transfer to a predetermined slow rotation. There is.

[0003]

The drive roller for driving in the conventional electric motor for conveying heavy goods as described above, in order to convey heavy goods, keeps the conveying speed within a prescribed safe speed. The deceleration mechanism is used for.
However, in the conventional reduction gear mechanism, in order to transmit the rotation speed output from the motor as a reduced rotation speed within the specified range to the drive roller, a large reduction gear ratio is required. In addition, it is bulky in weight and complicated in structure, which makes it difficult to handle.

Therefore, the present invention was created in view of the various existing circumstances as described above, and can be incorporated even in a narrow space in a device, thereby reducing the weight and size of the entire electric roller for carrying heavy objects. It is an object of the present invention to provide an electric roller for carrying a heavy object that can be handled and is easy to handle.

[0005]

In order to achieve the above object, in the present invention, the drive roller 31 supported together with the casters 2 is decelerated on the flat box-shaped frame 1 having a substantially rectangular shape in a plane. In the electric roller for conveying heavy goods, which is provided with the speed reducing mechanism 33 for rotating, the speed reducing mechanism 3
3, the input shafts 46A and 46B rotated and driven by the drive source 21 are inserted and fixed in the center of the elliptical rotary body 59, and a flexible ball bearing 60 is mounted on the outer periphery of the elliptical rotary body 59. And a ball cup 60 of the wave generator 58 is installed inside the opening end of the flexible thin cup-shaped flexspline 62 having a plurality of teeth engraved on the outer periphery. Tooth portions of the flexspline 62 are deformed into an elliptical shape, and the tooth portions of the inner circumference of the circular spline 64, which are engraved with slightly more than the number of teeth of the flexspline 62, mesh with the tooth portions near both ends of the flexspline 62 on the long axis side. Rotation of the wave generator 58, which is rotationally driven by the drive source 21 via the input shafts 46A and 46B, to the flexspline 62. Drive roller 31 by a driving force outputted as the reduced rotation from the circular spline 64
It is designed to be driven to rotate. The reduction mechanism 3
3 is inside the drive roller 31. A circular spline 64 is fitted and fixed inside the drive roller 31, and both ends of the flexspline 62 deformed into an elliptical shape are attached to the inner peripheral teeth of the circular spline 64. The drive roller 3 is provided on the side end surface of the flexspline 62 housed inside the drive roller 31 while meshing with the adjacent tooth portions.
Sleeves 47A, 47 that are rotatably supported relative to each other
One end of B is fixed, and the other ends of the sleeves 47A and 47B facing the outside of the drive roller 31 are rotated and stopped by engagement and disengagement with a locking means arranged adjacent to the drive roller 31. The locking portion 47J is provided, and the sleeve 47
A, 47B or a side end surface of the flexspline 62, which is inserted from the outside, is connected to a wave generator 58 at the end of the input shaft 46A, 46B. The flexspline 62 is engaged with a sleeve 47A. , 47
In the state of being held unrotatable by B, the input shafts 46A, 4
The rotation of the wave generator 58 rotatably driven by 6B is such that the drive roller 31 is rotated at a reduced speed via the circular spline 64. The speed reduction mechanism 70 is disposed between the drive source 21 and the drive roller 31, fixes the circular spline 72 inside one end of the housing 9 fixed to the frame 58, and forms a tooth portion on the inner circumference of the circular spline 72. In addition, the tooth portions near both ends on the major axis side of the flexspline 74 deformed into an elliptical shape are respectively engaged, and the side end surface of the flexspline 74 housed inside the housing 9 faces the inside from one end of the housing 9. As described above, one end of a sleeve 76 rotatably supported by the housing 9 is fixed, and a wave generator 88 is inserted through and fixed to an input shaft 85 rotatably supported by the other end of the housing 9 so that one end side faces the outside. The other end of the input shaft 85, which is inserted through the side end surface of the spline 74, is rotatably supported by one end of the sleeve 76, and is in contact with the drive source 21. The rotation of the wave generator 88 which is driven to rotate via the input shaft 85 which is, flexspline 7
4 is output to the sleeve 76 as decelerated rotation, and the decelerated rotation is output from the sleeve 76 to the drive roller 31 via the transmission means 82.

In the electric roller for conveying heavy goods according to the present invention, when the driving roller 31 is driven, for example,
When the drive source 21 is activated by operating an operation switch such as a remote controller, the elliptical wave generator 58 is rotationally driven via the input shafts 46A and 46B. When the reduction mechanism 33 is mounted inside the drive roller 31 rotatably supported by the base frame,
Before activating the drive source 21, the flexspline 62 is held in a non-rotatable state via the sleeves 47A and 47B engaged with the locking means. Then, when the drive source 21 is driven, the elliptic rotary body 59 of the wave generator 58 fixed to the input shafts 46A and 46B rotates inside the fixed flexspline 62 via the ball bearing 60. The long axis that rotates following the rotation of the elliptical rotating body 59 elastically deforms the teeth on the outer circumference of the flexspline 62 into an elliptical shape, while meshing the teeth near the ends of the long axis with the teeth on the inner circumference of the circular spline 64. Rotate while letting. here,
When the number of teeth on the inner circumference of the circular spline 64 is Zc and the number of teeth on the outer circumference of the flexspline 62 is Zf, the reduction ratio i =
The drive roller 31 given by (Zc-Zf) / Zc and having the circular spline 64 fixed thereto follows the rotation of the long axis of the wave generator 58 and the input shafts 46A and 46A.
It is driven as decelerated rotation in the same direction as the rotation direction of B.
Further, when the speed reduction mechanism 70 is arranged between the drive source 21 and the drive roller 31, when the drive source 21 is activated, the elliptical rotating body of the wave generator 88 is driven by the input shaft 85 connected to the drive source 21. 89 rotates inside the flexspline 74 via a ball bearing 90.
The major axis of the elliptical rotary body 89 rotates while elastically deforming the tooth portions on the outer circumference of the flexspline 74 into an elliptical shape, while engaging the tooth portions near both ends of the major axis with the tooth portions on the inner circumference of the housing 9.
The flexspline 74 is rotationally driven in the opposite direction. That is, when the number of teeth on the inner circumference of the circular spline 72 is Zc and the number of teeth on the outer circumference of the flexspline 74 is Zf, the reduction ratio i = (Zf-Zc) / Zf is given. When Zf <Zc, the flexspline 74 is given. Input shaft 85
The rotation is reverse to the rotation direction of. Therefore, the drive roller 31 output from the sleeve 76 connected to the side end of the flexspline 74 via the transmission means 82 is the input shaft 8
It is driven as decelerated rotation in the direction opposite to 5.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION A first embodiment of the present invention will be described below with reference to the drawings. Reference numeral 1 shown in FIGS. 1 to 6 is a flat box-shaped frame having a substantially rectangular shape in a plane. The driven casters 2 are supported on the substantially four corners, and the left and right sides of the substantially central portion include a speed reduction mechanism 33 which will be described later.
A pair of left and right drive rollers 31 for traveling drive are provided on both sides, which are provided as schematic views in FIGS. 2 and 3. A drive source 21 such as a motor which is rotationally driven by a commercial power source of 100V is arranged at the rear portion of the frame 1, and transmission of a driving force by an operation switching mechanism 41 arranged at substantially the center is switched via a clutch mechanism 51. The drive roller 31 is rotated by so that the drive roller 31 travels on the conveyance road surface together with the driven caster 2.

The frame 1 itself is made of a robust material that supports the object P to be placed and bears the load. Further, the turntable 7 is rotatably supported by a rotary shaft supported through a pivot bearing formed in the top plate portion 3 above the frame 1 and a ball bearing arranged in the top plate portion 3. The transported object P placed on the turntable 7 has a load supported by the frame 1 side portion, and the turntable 7 itself is transported by the transported object P.
It is possible to perform relative alignment in any direction with respect to.

The output shaft 22 of the drive source 21 is mounted to the front, and is connected via an operation switching mechanism 41 which is supported and arranged in a gear chamber 42 which is partitioned and formed in a substantially central portion of the frame 1. The drive source 2 is provided to the drive roller 31 arranged in the drive roller support chamber 32 formed on the left and right sides of the gear chamber 42 respectively.
The driving force of 1 is transmitted and output.

In the transmission mechanism 41, as shown in FIGS. 2 and 3, the drive bevel gear 43 and the free bevel gear 44 are coaxial with each other between the partition walls before and after partitioning and forming the gear chamber 42. The front and rear partition walls are supported so that their surfaces face each other, and the drive bevel gear 43 is connected to the output shaft 22 of the drive source 21.
And the free bevel gear 44 is in a free rotation state. At this time, the free bevel gear 44 has the operation switching mechanism 4
It is provided in order to configure a braking mechanism (not shown) together with the strength balance of strength of itself. Then, one end side (upper side) of the drive roller bearing chamber 32 on the upper side is connected to the speed reduction mechanism 3
The first hollow shaft 47A (upper side in FIGS. 2 and 3), which is the sleeve on one side supported by the drive roller 31 via the shaft 3, is inserted into the shaft hole of the first hollow shaft 47A in the gear chamber 42 and the one first shaft 46A. A first bevel gear 45A in the drawing is pivotally attached to the other end of the shaft in a free rotation state via a bearing 48, and the first bevel gear 45A is meshed with the drive bevel gear 43 and the free bevel gear 44, respectively.

On the other hand, the second shaft 46B, one end of which is supported by the drive roller 31 through the speed reduction mechanism 33 on the lower side of the drive roller support chamber 32 in the figure, is the second hollow as a sleeve via the bearing. It is inserted into the shaft hole of the shaft 46B so as to face the inside of the gear chamber 42, and the second shaft 46B (lower side in FIGS. 2 and 3) in the gear chamber 42 has a second end at the other end.
The bevel gear 45B is fitted and the second bevel gear 45B is meshed with the drive bevel gear 43 and the free bevel gear 44, respectively. In this manner, in the gear chamber 42, the first bevel gears face each other so that the drive bevel gears 43 and the free bevel gears 44 arranged to face each other are engaged with each other so as to be sandwiched from the side direction. 45A and the second bevel gear 45B are arranged to face each other, and the first bevel gear 45A and the second bevel gear 45B are arranged.
Each of them is always rotated in the opposite direction.

Then, as will be described later, the first shaft 4
First bevel gear 45A, second bevel gear 45B than the length of 6A
The length is made longer by an amount corresponding to each facing distance, and a stroke range for sliding a clutch 52 of a clutch mechanism 51 described later along the first shaft 46A is set. In addition, the above hollow shafts 47A, 47
7B has a double structure with the upper and lower shafts 46A, 46B, etc., and the outer peripheries of these boss shafts are connected via bearings to the upper and lower partition walls of the gear chamber 42 and the inside of the rotary shaft of the drive roller 31. Is supported by the first shaft 4
Although 6A and the second shaft 46B are coaxially located, they are separated from each other and rotate independently.

As shown in FIGS. 2 and 3, the first shaft 4
6A, the other end of each of the second shafts 46B penetrates into the drive roller bearing chamber 32 side together with each of the first hollow shaft 47A and the second hollow shaft 47B, and is installed inside the rotary shafts of the pair of drive rollers 31 to decelerate. Each of them is linked to the mechanism 33 so that the frame 1 can be smoothly moved by a fine movement. This drive roller 31
Is driven to rotate by the driving force of the driving source 21 via the speed reduction mechanism 33 provided inside the device.

Here, the speed reducing mechanism 33 will be described in detail. As shown in FIGS. 1 to 4, the speed reduction mechanism 33 has a first
One end of each of the shaft 46A and the second shaft 46B on the side of the drive roller 31 that is inserted into the rotary shaft is linked to a wave generator 58 mounted inside the rotary shaft of the drive roller 31. More specifically, in FIG. 4, for the sake of convenience, the speed reduction mechanism 33 mounted inside the left drive roller 31 will be described with reference to FIG. 5. Inside the drive roller 31 rotatably supported by the frame 1, a first hollow shaft 46A serving as a sleeve is rotatably supported via a bearing 48, and the first hollow shaft 46A drives the hollow shaft. A locking claw 47J is formed on the outer periphery of the other end facing the outside of the roller 31, which is a locking portion that can be engaged with and disengaged from a free movement canceling mechanism (not shown) as locking means arranged adjacent to the drive roller 31. It is possible to rotate or stop by engaging or disengaging with this release mechanism.

A wave generator 58 is formed in an elliptical shape by coating a flexible ball bearing 60 on the outer periphery of an elliptical rotating body 59 at the end of a shaft 47A which is an input shaft inserted through the hollow shaft 46A. Are fixed via bolts B2. A side end surface of the flexspline 62 housed inside the drive roller 31 is fixed to an end portion of the hollow shaft 46A. The flex spline 62 is formed into a flexible thin-walled cup shape having a plurality of teeth engraved on the outer circumference, and the ball bearing 60 of the wave generator 58 is installed inside the open end of the flex spline 62. The tooth part of is deformed into an elliptical shape.

An annular circular spline 64 having a plurality of teeth engraved on its inner periphery is fixed inside the drive roller 31 via a bolt B1, and the teeth on the inner periphery of the circular spline 64 are fixed. , This circular spline 6
The tooth portions in the vicinity of both ends on the major axis side of the flex spline 62 having the outer teeth formed by reducing the number of the inner teeth by two are meshed with each other, and the tooth portions are completely separated at the minor axis portion. There is. In this way, the harmonic drive type reduction mechanism is configured.

Next, the clutch mechanism 51 will be described.
As shown in FIGS. 2 to 4, this clutch mechanism 51
Is arranged coaxially with the speed reduction mechanism 33 of the drive roller 31 so as to switch between the forward / backward movement and the turning movement of the frame 1, and the first shaft 46A and the second shaft 46B are arranged.
It extends from the position of the first bevel gear 45A by a length corresponding to the facing interval between the first bevel gear 45A and the disc-shaped clutch 52 is axially movable via a key to the extended portion of the first bevel gear 45A. There is. For example, four or six clutch pins 53 are pierced and fixed to the side surface of the clutch 52 along the circumference, and the first bevel gear 45A and the second bevel gear 45 are provided.
On the opposite flat side surface of B, a circular concave portion is formed around the gear rotation axis, and at this circular concave portion, for example, four places or six portions are formed to face the clutch pin 53 along the circumference.
Clutch holes 55 are formed at the points. The clutch 52 is slid by a shifter member 57 that is shifted by the magnetic attraction force of the solenoid 56.

Therefore, the clutch 52 has the second bevel gear 45B.
When it slides, the clutch pin 53 is engaged and connected to the clutch hole 55 on the side surface of the second bevel gear 45B, whereby the clutch 52 and the second bevel gear 45B are integrated, and the drive rollers 31 on both sides are decelerated. While being decelerated via the mechanism 33, the frame 1 is rotated in the same direction to move the entire frame 1 forward and backward. Further, in order to switch between the forward drive state and the reverse drive state at this time, the drive source 21
It suffices to reverse the rotation direction of. On the contrary, the clutch 52 disengages from the second bevel gear 45B, the first bevel gear 45A and the second bevel gear 45B become free, and the first bevel gear 45A has the first shaft 46A and the second bevel gear 45B has the second bevel gear 45B. The drive bevel gears 4 are connected to each of the shafts 46B by being integrally connected.
A first bevel gear 45A which is rotated in reverse by meshing with the third bevel gear 45A,
The second bevel gears 45B respectively rotate the left and right drive rollers 31 in opposite directions via the respective first shaft 46A and second shaft 46B, so that the entire frame 1 is swung on the spot.

A free movement canceling mechanism (not shown) for free rotation of the drive roller 31 for manually moving the frame 1 is provided inside the top plate 3 of the frame 1. By locking each of the hollow shaft 47A and the second hollow shaft 47B, the drive roller 31 is brought into a rotationally driven state by the driving source 21, and conversely, the first hollow shaft 47A and the second hollow shaft 4 are driven.
By unlocking each of 7B, the drive roller 3
1 is in a freely rotatable state, so that the frame 1 can be manually moved when the drive source 21 is stopped.

The operation of the speed reduction mechanism 33 having the above structure will be described below. First, as shown in FIGS. 2 to 5, when decelerating the pair of drive rollers 31,
First hollow shaft 47A, second hollow shaft 47B
The locking claw 47J at the other end is locked with the locking portion of the free movement releasing mechanism. Therefore, by driving the drive source 21, the drive bevel gear 4 of the output shaft 22 of the drive source 21 is driven.
First bevel gear 45A and second bevel gear 45B meshing with No. 3
Are simultaneously driven to rotate. By the rotation of the first bevel gear 45A and the second bevel gear 45B, the second shaft 46B and the first shaft 46A are rotationally driven in the same direction via the clutch pin 53 of the clutch 52.

Further, the speed reducing mechanism 33 mounted on the left drive roller 31 shown in FIGS. 4 and 5 will be described. The flex spline 62 fixed to the end of the first hollow shaft 47A is in a stopped state, and in this state,
The elliptical rotary body 59 of the wave generator 58 rotates with the first shaft 46A inside the flexspline 62 in a fixed state via a ball bearing 60.

The operation of the decelerated rotation according to this embodiment at this time will be described with reference to FIG. First shaft 46A
Elliptical rotator 5 of wave generator 58 fixed to
9 rotates inside the flexspline 62 in the fixed state via the ball bearing 60. The long axis that rotates following the rotation of the elliptical rotating body 59 elastically deforms the teeth on the outer circumference of the flexspline 62 into an elliptical shape, while meshing the teeth near the ends of the long axis with the teeth on the inner circumference of the circular spline 64. Rotate while letting. Here, the number of teeth on the inner circumference of the circular spline 64 is Zc, and the number of teeth on the outer circumference of the flexspline 62 is Zf.
Then, the drive roller 31 provided with the reduction ratio i = (Zc−Zf) / Zc and having the circular spline 64 fixed thereto follows the rotation of the major axis of the wave generator 58 and the rotation direction of the first shaft 46A. It is driven as decelerated rotation in the same direction.

That is, in the initial state before activation shown in FIG. 6A, the reference point P1 on the elliptical rotator 59 of the wave generator 58, the reference point S of the flexspline 62 and the reference point P2 of the circular spline 64 are It is located on the same radius. Therefore, as shown in FIG. 6B, the elliptical rotator 59 is rotated clockwise by the first shaft 46A to move the reference point P1 by 90 degrees. At this time, since the flexspline 62 is in a non-rotatable state, the reference point S thereof remains stationary, and the circular spline 64 meshing with the outer teeth of the flexspline 62 is the same as the elliptic rotary body 59. It slowly rotates around, and the reference point P2 rotates slightly to the right. Next, as shown in FIG. 6C, when the ellipsoid of revolution 59 makes one revolution and the reference point P1 comes to the original position and coincides with the reference point S of the flexspline 62, the circular spline 64 The reference point P2 is decelerated and rotated in the same rotation direction of (Zc-Zf) / Zc.

Next, a second embodiment of the present invention is shown in FIG.
This will be described with reference to FIG. In addition, common components are denoted by the same reference numerals, and detailed description thereof will be omitted. The drive source 21 similar to that in the first embodiment is mounted between the left and right side walls at the rear portion of the frame 68, and
The driving force of the driving source 21 is decelerated and output to the driving roller 31 via the speed reduction mechanism 70 supported and arranged by the substantially cylindrical housing 9 fixed to the central portion of 8 so that it is rotated together with an auxiliary wheel (not shown). I am doing it.

The speed reduction mechanism 70 is arranged between the drive source 21 and the long barrel-shaped drive roller 31 supported on the front portion of the frame 68, and is fixedly mounted on the bottom surface or the top surface of the frame 68. An annular circular spline 72 is fixed inside one end of the housing 9. Housing 9
A drive shaft 85 serving as an input shaft having a sprocket 86 for transmitting the driving force from the drive source 21 at one end facing the outside is rotatably attached to the other end of a sleeve 76, which will be described later, on a cover 78 closing one end of the sleeve 78. It is supported.

An elliptical rotary body 89 of a wave generator 88 is fixed to the drive shaft 85, and a flexible ball bearing 90 which is wound around the outer circumference of the elliptical rotary body 89 and deformed into an elliptical shape is flexsplined. The tooth portions near the both ends on the major axis side of the outer periphery of the flex spline 74 which is fitted into the inside of one end side of the 74 and is deformed into an elliptical shape meshes with the tooth portions of the inner periphery of the circular spline 72, respectively. It is housed.

Further, on the side end surface of the flexspline 74, a sleeve which is rotatably supported by the other end of the housing 9 and the side wall 77 of the frame 68 so as to face the inside from one end of the housing 9 and serves as an output side for decelerated rotation. One end of 76 is fixed, and a support shaft 80 is rotatably supported by the inside of one end of the sleeve 76 and the side wall 77 of the frame 68 so as to be slidable and freely rotatable with respect to the sleeve 76. Clutch teeth are formed on one end side of the sleeve 76, and can be engaged with the clutch teeth of a sprocket 82 serving as a transmission means fixed to the support shaft 80. When the clutch teeth mesh with each other, the decelerated rotation of the sleeve 76 causes the sprocket 8 connected to the sleeve 76 to rotate.
The drive roller 31 is rotatably driven via the chain that is stretched over 2.

The speed reducing mechanism 70 according to the present embodiment having the above-described structure, when the driving force from the driving source 21 is transmitted to the drive shaft 85 via the sprocket 86, the wave fixed to the drive shaft 85. The elliptical rotary body 89 of the generator 88 rotates inside the flexspline 74 connected to the sleeve 76 via the ball bearing 90. The flexspline 74 is rotationally driven in the direction opposite to the rotational direction of the drive shaft 85. . Ellipsoid of revolution 89
The long axis that rotates following the rotation of
4 The teeth on the outer circumference are elastically deformed into an elliptical shape, and the teeth near the both ends of the long axis are rotated while meshing with the teeth on the inner circumference of the circular spline 72.

Here, when the number of teeth on the inner circumference of the circular spline 72 is Zc and the number of teeth on the outer circumference of the flexspline 74 is Zf, the reduction ratio is given by i = (Zf-Zc) / Zf,
When Zf <Zc, the rotating direction of the flexspline 74 is reverse to the rotating direction of the drive shaft 85.
Therefore, the drive roller 31 output from the sleeve 76 connected to the side end of the flexspline 74 via the sprocket 82 is driven as decelerated rotation in the direction opposite to the drive shaft 85.

That is, in the initial state before activation shown in FIG. 8A, the reference point P1 of the elliptic rotary body 89 of the wave generator 88, the reference point S of the flexspline 74 and the reference point P2 of the circular spline 72 are It is located on the same radius. Therefore, as shown in FIG. 8B, the elliptical rotator 89 is rotated clockwise by the drive shaft 85 to move the reference point P1 by 90 degrees. At this time, since the circular spline 72 is in a non-rotatable state, the reference point P1 thereof remains stationary, and the flex spline 74 meshing with the internal teeth of the circular spline 72 rotates counterclockwise. , The reference point S moves slightly to the left. Next, as shown in FIG. 8C, when the elliptic rotary body 89 makes one rotation and the reference point P1 comes to the original position, the reference point S of the flexspline 74 is (Zf-Zc).
/ Zf This means decelerated rotation in the opposite direction. The decelerated rotation of the flexspline 74 is caused by the sprocket 82 and the chain via the sleeve 76 to drive the drive roller 31.
Be transmitted to.

[0031]

The present invention is configured as described above,
The input shafts 46A, 46B, 85, which are rotationally driven by the drive source 21, are inserted and fixed in the centers of the elliptical rotary bodies 59, 89, and ball bearings 60, 90 are provided on the outer circumferences of the elliptical rotary bodies 59, 89. An elliptical wave generator 58, 88 is formed, and the wave generator 5 is provided inside the opening end of the flexspline 62 having a plurality of teeth engraved on its outer circumference.
8 and 88 ball bearings 60 and 90 are installed to deform the outer peripheral teeth into an elliptical shape, and the teeth of the circular splines 64 and 72 are engraved slightly more than the number of teeth of the flexsplines 62 and 74. Flexspline 6
Harmonic drive type reduction mechanism 33, 70 in which tooth portions near both ends of the long axis of 2, 74 are engaged with each other
However, the speed reduction mechanism 3
Since the whole 3 can be miniaturized, the structure of the mechanism can be made simple without being bulky in terms of the outer shape and weight of the electric roller for conveying heavy goods.

In particular, in the present invention, the circular spline 64 is fitted and fixed in the driving roller 31,
The tooth portions on the inner circumference of the circular spline 64 mesh with the tooth portions near both ends on the major axis side of the flexspline 62 deformed into an elliptical shape, and on the side end surface of the flexspline 62 housed inside the drive roller 31, Sleeves 47A and 4B that are fixed to one end of the sleeves 47A and 47B that are rotatably supported inside and that are exposed to the outside of the drive roller 31
A locking portion 47J that rotates and stops at the other end of 7B by engaging and disengaging with a locking means disposed adjacent to the drive roller 31.
And the input shafts 46A and 46A through which the side end surfaces of the sleeves 47A and 47B and the flexspline 62 are inserted from the outside.
When the speed reduction mechanism 33 of the harmonic drive system, which is formed by connecting the wave generator 58 to the end of B, is mounted inside the pair of drive rollers 31, respectively,
Since a space is formed on the lower surface of the drive roller 31, the operation switching mechanism 41, the clutch mechanism 51, the free movement canceling mechanism, and the like can be incorporated in each drive roller 31. Therefore, since the speed reduction mechanism 33 has a unit configuration incorporated in the drive roller 31, the drive roller 31 can be replaced in a unit and maintenance is facilitated.

In addition, the teeth on the inner circumference of the circular spline 72 fixed to the inside of one end of the housing 9 fixed to the frame 68 have teeth near the both ends on the major axis side of the flexspline 74 deformed into an elliptical shape. The sleeve 7 is rotatably supported by the housing 9 so as to face the inside from one end of the housing 9 on the side end surface of the flexspline 74 housed inside the housing 9 while engaging the respective parts.
6, one end of 6 is fixed, and a wave generator 88 is inserted and fixed to an input shaft 85 which is rotatably supported by the other end of the housing 9 so that one end side faces the outside.
The drive source 21 and the drive roller 31 are provided with a harmonic drive type reduction mechanism 70 in which the other end of the input shaft 85, which is inserted through the side end face thereof, is rotatably supported by one end of the sleeve 76.
Since it can be mounted in the housing 9 independently fixed between the drive roller 31 and the drive roller 31, the speed reduction mechanism 70 itself is configured as a unit and can be independently maintained from the drive roller 31. . In addition, by interposing a transmission mechanism (sprocket, chain) having a predetermined rotation ratio between the drive source 21 and the drive roller 31, a desired reduction ratio can be obtained.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a speed reduction mechanism incorporated in an electric roller for carrying heavy goods of the present invention.

FIG. 2 is a plan cross-sectional view showing a state in which a speed reducing mechanism of an electric roller for carrying heavy goods according to a first embodiment of the present invention is incorporated inside a drive roller.

FIG. 3 is likewise an enlarged plan sectional view of a main part.

FIG. 4 is a cross-sectional view of an operation switching mechanism and a reduction mechanism when the clutch arrangement is viewed from the front.

FIG. 5 is a sectional view of a drive roller on one side on which a reduction mechanism is mounted.

FIG. 6 is likewise an operation explanatory view of the speed reduction mechanism.

FIG. 7 is a plan cross-sectional view showing a state in which a reduction mechanism of an electric roller for conveying heavy goods according to a second embodiment of the present invention is arranged in the middle of a drive source and a drive roller.

FIG. 8 is likewise an explanatory view of the operation of the reduction mechanism.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Frame 2 ... Followed caster 3 ... Top plate 7 ... Turntable 21 ... Drive source 22 ... Output shaft 31 ... Drive roller 32 ... Drive roller support chamber 33 ... Reduction mechanism 41 ... Operation switching mechanism 42 ... Gear chamber 43 ... Drive Bevel gear 44 ... Free bevel gear 45A ... First bevel gear 45B ... Second bevel gear 46A ... First shaft (input shaft) 46B ... Second shaft (input shaft) 47A ... First hollow shaft (sleeve) 47B ... Second Hollow shaft 47J ... Locking pawl 48 ... Bearing 51 ... Clutch mechanism 52 ... Clutch 53 ... Clutch pin 55 ... Clutch hole 56 ... Solenoid 57 ... Sictor member 58 ... Wave generator 59 ... Elliptical rotor 60 ... Ball bearing 62 ... Flexspline 64 Circular spline 68 Frame 70 Speed reducer 72 Circular spline 74 Click splines 76 ... sleeve 77 ... side wall 80 ... support shaft 82 ... sprocket 85 ... drive shaft (input shaft) 86 ... sprocket 88 ... wave generator 89 ... oval rotational body 90 ... ball - bearings B1, B2 ... bolt P ... conveyed object

Claims (3)

[Claims] 1. An electric roller for conveying heavy goods, comprising a deceleration mechanism for decelerating and rotating a drive roller supported together with a caster on a flat box-shaped frame having a substantially rectangular shape in a plane, wherein the deceleration mechanism is an elliptical rotating body. An input shaft, which is driven to rotate by a drive source, is inserted and fixed at the center of the ellipsoidal rotor, and a ball bearing having flexibility is installed on the outer periphery of the elliptical rotor to form an elliptical wave generator. A flexible thin cup-shaped flexspline with engraved teeth is internally provided with a ball bearing of a wave generator inside the open end to deform and form the outer peripheral tooth portion into an elliptical shape. It is made by meshing the teeth on the inner circumference of the circular spline, which are engraved slightly more, with the teeth near the ends on the long axis side of the flexspline.
The rotation of a wave generator that is rotationally driven by a drive source via an input shaft, and the drive roller that is output as a decelerated rotation from a flexspline or a circular spline rotationally drives a drive roller. Electric transport roller. 2. The deceleration mechanism is inside a drive roller, a circular spline is fitted and fixed inside the drive roller, and a long axis of a flexspline deformed into an elliptical shape is formed on a tooth portion of an inner circumference of the circular spline. The tooth portions near both ends of the side are engaged with each other, and one end of a sleeve rotatably supported in the drive roller is fixed to the side end surface of the flexspline housed inside the drive roller, and the drive is performed. The other end of the sleeve facing the outside of the roller is provided with an engaging portion for rotating and stopping by engaging and disengaging with an engaging means arranged adjacent to the driving roller, and the side end surface of the sleeve or the flexspline is provided. A wave generator is connected to the end of the input shaft inserted from the outside, and the flexspline is held non-rotatably by a sleeve engaged with a locking means. The electric roller for conveying a heavy goods according to claim 1, wherein in the state, the rotation of the wave generator rotationally driven by the input shaft is rotated by decelerating the drive roller via the circular spline. 3. The speed reduction mechanism is arranged between a drive source and a drive roller, and a circular spline is fixed inside one end side of a housing fixed to the frame, and a tooth portion of an inner circumference of the circular spline is provided. The elliptical deformed flexspline meshes with the teeth near the both ends of the major axis, and the side end surface of the flexspline housed inside the housing is rotatable in the housing so that it faces the inside from one end of the housing. While fixing one end of the rotatably supported sleeve, insert and fix the wave generator into the input shaft rotatably supported at the other end of the housing so that one end side is exposed to the outside, and insert the other side of the flexspline into the input shaft. The end is rotatably supported on one end of the sleeve,
The rotation of the wave generator rotationally driven via the input shaft connected to the drive source is output to the sleeve via the flexspline as decelerated rotation, and the decelerated rotation is output from the sleeve to the drive roller via the transmission means. The electric roller for conveying heavy goods according to claim 1.