WAVE GENERATOR AND STRAIN WAVE GEARING

摘要

A wave generator of a strain wave gearing has a plug, a wave generator bearing mounted to an outer peripheral surface of the plug, an input shaft protruding from the center of the plug to a first side running along a center axis, and a bearing arrangement on which a support bearing supporting the input shaft is arranged. Relative to an outer ring end surface of the wave generator bearing that faces the first side, a center-side plug end surface of a plug end surface facing the same direction is in a position withdrawn from the first side toward the opposite direction. The bearing arrangement is provided between the center-side plug end surface and the outer ring end surface encircling the input shaft. The input shaft can be fitted within the width dimension of the wave generator, and a strain wave gearing having a short axial length can be achieved.

主权项

1. A wave generator of a strain wave gearing, in which the wave generator is arranged coaxially inside a flexible externally toothed gear, flexes the externally toothed gear into a non-circular configuration to mesh partially with a rigid internally toothed gear, and causes to move meshed position between the externally toothed gear and the internally toothed gear in a circumferential direction, the wave generator of the strain wave gearing comprising:
a rigid plug; a wave generator bearing installed on a non-circular outer peripheral surface of the plug; and a bearing arrangement part; wherein the bearing arrangement part is a section having arranged therein a support bearing for supporting an input shaft connected to the plug from a first side along a central axis relative to the plug; the plug has a plug end surface facing the first side, and a center-side plug end surface portion of the plug end surface is set back toward a second side relative to an outer race end surface of an outer race of the wave generator bearing, the outer race end surface facing the first side and the second side being opposite the first side along the central axis; and the bearing arrangement part is formed in a portion between the outer race end surface and the center-side plug end surface portion, in a direction of the central axis.