Eccentric Oscillation Gear Device And Method For Producing Eccentric Oscillation Gear Device

Abstract

Disclosed is an eccentric oscillation gear device which rotates a second counterpart member with respect to a first counterpart member at a rotational speed obtained by reducing an input rotational speed at a predetermined rotational speed ratio. The eccentric oscillation gear device is provided with an external cylinder which is connected to the first counterpart member and which has an inner surface provided with a plurality of internal teeth; a crank shaft which has an eccentric portion and which rotates about an axis of the crank shaft within the external cylinder by a rotative force being input to the crank shaft; an externally toothed gear which is attached to the eccentric portion and which oscillates and rotates in association with an eccentric rotation of the eccentric portion while meshing with the internal teeth; a carrier which is connected to the second counterpart member and fitted in the external cylinder and which rotates about an axis of the external cylinder with respect to the external cylinder by receiving a rotative force of the externally toothed gear; and a carrier bearing which supports the carrier within the external cylinder with respect to the external cylinder so that the carrier is rotatable about the axis of the external cylinder. The carrier bearing has an inner ring portion which is fitted onto the carrier and which is rotatable about the axis of the external cylinder integrally with the carrier, an outer ring portion which is fitted in the external cylinder and which is rotatable about the axis of the external cylinder integrally with the external cylinder, and a roll member which is rotatably disposed between the inner ring portion and the outer ring portion. A gap in which the roll member is movable in a radial direction of the external cylinder is formed between the inner ring portion and the outer ring portion.

Description

technical field [0001] The present invention relates to an eccentric oscillating gear device and a method for manufacturing the eccentric oscillating gear device. Background technique [0002] At present, the following gear device is known, that is, with the rotation of the crankshaft, the externally toothed gear meshes with the internal teeth provided on the inner wall of the casing to oscillate and rotate, so that the rotational speed of the input crankshaft is reduced at a specified rotational speed ratio to obtain a reduced rotational speed. The output rotates. Such a gear device is disclosed in, for example, Patent Document 1 below. [0003] The gear unit disclosed in this Patent Document 1 is used in a speed reducer, reduces the rotational speed of the rotational force input from the motor, and transmits the rotational force at the reduced rotational speed to a target member (crank arm). The gear device includes a casing, and a case that is rotatably arranged in the ...

AI Technical Summary

Problems solved by technology

[0007] However, in order to prevent the gear unit from being damaged due to the radial load, it is necessary to insert a radial load shaft between the torque transmission shaft for transmitting the rotational force and the target member.

Therefore, there is a problem that the number of parts increases in this structure

In addition, in this structure, it is necessary to provide a small-diameter portion on the torque transmission shaft, or to use a spline structure at the joint of the radial load shaft and the torque transmission shaft, so there is also a problem that the structure of the gear device is complicated.

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