FLEXIBLE EXTERNALLY TOOTHED GEAR FOR WAVE GEAR DEVICE

摘要

A cup-shaped flexible externally toothed gear of a wave gear device, wherein a diaphragm plate slopes from a diaphragm internal peripheral edge portion contiguous to a boss part toward a diaphragm external peripheral edge portion contiguous to a cylindrical body portion in a direction in which the diaphragm external peripheral edge portion is at greater distance from an open end of the cylindrical body portion with respect to an orthogonal plane orthogonal to a central axis line of the device. The length dimension of the diaphragm plate and the length dimension of the cylindrical body portion in the axial direction can be increased. Therefore, the fatigue strength of the diaphragm plate and the load capacity of the wave gear device in which the flexible externally toothed gear has been incorporated can be increased.

主权项

1. A flexible externally toothed gear for a wave gear device comprising:
a boss constituted by a disc- or ring-shaped rigid body; a diaphragm plate that is continuous with an outer circumferential part of the boss and extends outward in a radial direction of the boss; a cylindrical cup body, continuous with a round outer periphery part of the diaphragm plate, that extends in a direction of a central axis of the boss and is capable of flexing in a radial direction thereof; and external teeth formed on a part of an outer circumferential surface of the cylindrical cup body at a side of an open end of the cylindrical cup body; the diaphragm plate being inclined with respect to a perpendicular plane that is perpendicular to the central axis, the diaphragm plate being inclined in a direction such that an outer periphery part of the diaphragm plate moves away from the open end of the cylindrical cup body, from an inner periphery part of the diaphragm plate toward the outer periphery part of the diaphragm plate, the outer periphery part of the diaphragm plate being continuous with the cylindrical cup body, and the inner periphery part of the diaphragm plate being continuous with the outer circumferential part of the boss.