JP2972966B2 - Planetary drive mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a planetary drive mechanism for a transmission or a processing machine.

[0002]

2. Description of the Related Art A conventional planetary drive mechanism does not slip in the rotational direction because a driving force is transmitted by gears, requires strict speed control, and is expensive. An apparatus for deforming a shaft by means of a planetary roller which rotates and revolves is known, for example, from Japanese Patent Application Publication No. 46-43980, in which three idler gears are interposed between a planetary gear and a sun gear, respectively. The structure is complicated and large. In addition, it is not easy to change the dimensions of the shaft member and to maintain the shaft member with this device. Although it is possible to stop the rotation of the shaft when deforming the shaft with this device, it is widely used because it requires two sets of expensive driving devices that can set the speed independently with almost the same capacity. Absent. A planetary drive mechanism using a friction wheel instead of a gear is conceivable, but in this case, there is the same problem as the planetary gear mechanism except that the degree of freedom of rotation due to the occurrence of slip between the friction wheels is increased. Further, when a driven friction wheel is brought into contact with the inner surface of the driven friction ring, and this friction wheel is driven by another drive source, this drive source becomes a negative drive source when the rotation of the shaft member is to be stopped. It will be a generator. Even if energy can be recovered by this generator, the amount of capital investment of the drive unit itself increases, and improvement is desired.

[0003]

SUMMARY OF THE INVENTION It is a first object of the present invention to provide a planetary drive mechanism capable of almost stopping the rotation of a shaft in order to overcome the above-mentioned problems of the prior art. It is a second object of the present invention to provide a planetary drive mechanism that minimizes an energy circulation path to reduce energy loss and equipment cost.

[0004]

The present invention will be described below with reference to the embodiment of FIG. (1) In the present invention, the center hole 2 of the driven gear 1 for roller rotation is used.
The body 4 of a set of three or four rollers is in contact with the inner surface of a friction ring 3 mounted on the roller, and the rotating shafts 5 of these rollers are twisted around the machine center axis 6 in the same direction. Part 7
Is supported by a bearing 8, and the bearing 8 is held in a pair of driven roller gears 9, 10 on both sides of the driven roller 1 for roller rotation so that the roller set revolves. The position of this roller is adjusted by the pressing mechanism 11 in the direction of the roller rotation shaft 5 with respect to the driven gear pairs 9 and 10, and the driven roller 1 for roller rotation and the driven gear pair 9 for roller revolution , And 10 are distributed and driven by distribution gears 13, 14, and 15 of the same drive shaft 12, and the ratio of the number of rotations of the driven roller 1 for roller rotation and the driven gear pair 9 and 10 for roller revolution is set to three rollers. Then 1.0
Between 9 and 1.14, 1.18 for 4-roller rollers
From 1.26 to 1.26, and the shaft 16 is deformed while being pressed in the axial direction while being pressed between the roller sets. This is a planetary drive mechanism.

[0005] In other words, the present invention provides a driven gear 1 for roller rotation in order to simplify and reduce the size of the drive system and the processing machine.
3 or 4 on the inner surface of the friction ring 3 attached to the center hole 2 of
The rollers of this set are brought into contact with each other to drive the rollers by utilizing the frictional force, and the reaction ring applied to the rollers is supported by the friction ring 3. These rollers support the shafts 7 at both ends of the roller 7 in a posture in which the rotation shaft 5 is twisted around the machine center axis 6 in the same direction.
However, since the processing reaction force is supported by the friction ring 3, the bearing 8 only needs to withstand mainly rotational force and axial force. The bearing 8 is held in the pair of driven gears for roller revolution 9 and 10 on both sides of the driven gear 1 for roller rotation to revolve the roller set. However, the weight of the revolving portion can be reduced and the size can be reduced. The position of this roller is adjusted in the direction of the roller rotation shaft 5 with a known screw-down mechanism 11 such as a screw or a hydraulic device with reference to the pair of driven gears 9 and 10 for roller revolution. The pressure reduction of the pressure reduction mechanism 11 may be performed when the revolution is stopped, or may be remotely controlled by a signal transmission using electromagnetic waves or light during the revolution operation. The operation direction of this rolling-down mechanism differs from the conventional method and is in the roller axis direction. The driven roller 1 for roller rotation and the driven gear pair 9 and 10 for roller revolving are distributed and driven by distribution gears 13, 14, and 15 of the same drive shaft 12, thereby facilitating synchronization of the speed relationship of the roller planetary motion. To almost stop the rotation of the shaft member 16 during the deformation processing, the driven gear 1 for roller rotation is used.
And the ratio of the number of rotations of the driven pair of roller revolving gears 9 and 10, that is, the value obtained by dividing the number of rotations of the driven gear 1 for roller rotation by the number of rotations of the driven pair of roller revolving gears 9 and 10. For a triplet roller, select between 1.09 and 1.14, and for a quadruple roller, select between 1.18 and 1.26. The lower limit of these values is a constraint condition due to the roller replacement work due to interference of adjacent rollers, the strength and structural design of the cage, etc.The upper limit of these values is provided if the roller diameter does not become too small and the roller gap becomes too large. Rather, it is a constraint to reduce problems with roller strength and work. Within such a range of the number of rotations, the shaft being deformed hardly rotates,
Such a slight rotation of the shaft does not require any special guiding device before and after, and also changes the state of the deformation of the shaft by gripping the shaft by another device close to this device, The rotation of the material can be easily stopped.

(2) In the present invention, the inner diameter of the friction ring 3 is increased toward the input side, and the roller set and the bearings 8 at both ends thereof are connected by a cage 17 to maintain the roller position on the input side. The roller is mounted on a cylindrical body 18 fitted in the diverted driven gear 9, and the roller is attached and detached by shifting the central axis of the cylindrical body 18 in the central axis length direction while keeping the central axis of the cylindrical body 18. 2. The planetary drive mechanism according to claim 1, wherein the housing for the driven gear for roller rotation is attached and detached at a right angle to the machine center shaft to replace the friction ring.

That is, in addition to the technology described in (1), the present invention is designed to cancel the axial force generated between the friction ring and the roller set, and to easily transfer the roller set to the entrance side. The inner diameter of the friction ring 3 is increased toward the entry side on the left side in FIG. As shown by the thin line in FIG. 1, the roller set and the bearings 8 at both ends thereof are connected by a cage 17 so that the roller set can be easily taken in and out from the input side, and the roller is kept in the attitude of the input side for revolving the roller. It is mounted on a cylindrical body 18 fitted into the driven gear 9. This fitting has a spline structure in which an external gear is fitted to, for example, an internal gear so that the rotational force of the driven gear 9 for roller revolution can be transmitted to the cylinder 18 and the cylinder 18 can slide in the axial direction. I do. By doing so, the cylindrical body 18 is moved in the central axis length direction while the machine central axis 6 is aligned, so that the roller can be easily attached and detached. As shown by a thin line in the lower part of FIG. 1, the housing 19 of the driven gear for roller rotation is attached and detached at right angles to the machine center shaft 6 so that the friction ring 3 can be easily replaced. Since little processing force or rotational force acts on the cage 17, the cage 17 can be reduced in size and weight.

[0008]

With the above construction, the present invention can provide a planetary drive mechanism capable of almost stopping the rotation of the shaft. Further, it is possible to provide a planetary drive mechanism that minimizes an energy circulation path to reduce energy loss and equipment cost.

[Brief description of the drawings]

FIG. 1 shows an example of a driving mechanism of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Driven gear for roller rotation 2 Center hole of driven gear for roller rotation 3 Friction ring 4 Roller body 5 Roller rotation shaft 6 Machine center shaft 7 Roller both ends shaft 8 Roller both ends shaft bearing 9, 10 For roller revolution Driven gear 11 Roll-down mechanism 12 Drive shaft 13, 14, 15 Distribution gear 16 Shaft 17 Cage 18 Cylindrical body 19 Housing for driven gear for roller rotation 20, 21 Housing for driven gear for roller revolution

Continuation of the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) B21B 13/00 B21B 13/20 B21B 19/02 B21B 35/12

Claims (2)

(57) [Claims] An inner surface of a friction ring attached to a central hole of a driven roller for roller rotation is brought into contact with a body of three or four sets of rollers, and the rotation axes of these rollers are arranged around the center axis of the machine. Support both ends of the roller with bearings in the same twisted posture,
This bearing is held in a pair of driven gears for roller revolution on both sides of the driven gear for roller rotation, so that the roller set revolves, and the roller is rotated with respect to the pair of driven gears for roller revolution. The position is adjusted by a rolling mechanism in the direction of the shaft, and the driven gear for roller rotation and the driven gear pair for roller revolution are distributed and driven by the distribution gear having the same drive shaft, and the driven gear for roller rotation is driven. And the ratio of the number of rotations of the driven gear pair for roller revolution is selected between 1.09 and 1.14 for a three-roller roller and between 1.18 and 1.26 for a four-roller roller. A planetary drive mechanism wherein the shaft member is deformed while being pressed in the axial direction by pressing the shaft member between the roller sets. 2. The inner diameter of the friction ring is increased toward the input side, and the roller set and the bearings at both ends thereof are connected by a cage to be fitted in the driven gear for roller revolution on the input side so as to maintain the attitude of the roller. The roller is attached to and detached from the cylinder by shifting the central axis of the cylinder in the central axis direction while keeping the center axis of the cylinder aligned with the machine center axis, and a housing for the driven gear for roller rotation. 2. The planetary drive mechanism according to claim 1, wherein the planetary gear is attached and detached at a right angle to the machine center axis to replace the friction ring.