# US 2014/0190298 A1 · Wave gear device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0190298 A1 - Document ID: US20140190298A1 - Status: Published application - Kind: A1 - Application number: 14/002,480 - Filed: 2013-01-09 - Published: 2014-07-10 - Earliest claimed: 2013-01-09 - Assignees: Harmonic Drive Systems Inc. - Inventors: Masaru Kobayashi; Yuki Honda - Web page: https://patentgrep.com/patent/US20140190298A1 ## CPC - F16H 49/001: {Wave gearings, e.g. harmonic drive transmissions} - F16H 57/04: Features relating to lubrication or cooling {or heating} (control of lubrication or cooling in hydrostatic gearing F16H61/4165) - Y10T 74/19642: Directly cooperating gears - F16H: GEARING - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract The interior space of a cup-shaped flexible externally toothed gear of a cup-type wave gear device is divided into a front interior space and a rear interior space by a partition mechanism. A lubricant is filled in the front interior space at the side of a wave generator, to which lubrication is required. The volume of the front interior space is set so that a necessary amount of lubricant is filled. Since the lubricant is not necessary to fill in the entire interior space of the flexible externally toothed gear, the amount of lubricant to be filled can be reduced. ## Claims ### Claim 1 A wave gear device characterized in comprising: a rigid internally toothed gear; a flexible externally toothed gear having a cylindrical barrel part capable of deflecting to a non-circular shape, a diaphragm extending radially inwards or outwards from a rear opening end of the cylindrical barrel part, and a disc-shaped or ring-shaped boss formed on an inner peripheral edge or an outer peripheral edge of the diaphragm; a wave generator mounted on an inside of an external teeth formation portion on a side towards a front opening end of the cylindrical barrel part, the wave generator deflecting the cylindrical barrel part to a non-circular shape so that the flexible externally toothed gear is partially engaged with the rigid internally toothed gear, and the wave generator moving positions of engagement between the two gears in a circumferential direction; and a partition mechanism, which rotates integrally with the flexible externally toothed gear, and partitions an interior space in the cylindrical barrel part into a front interior space on a side towards the wave generator and a rear interior space on a side towards the diaphragm. ### Claim 2 (depends on 1) The wave gear device according to claim 1, wherein the partition mechanism has an elastic body capable of elastically deforming with the cylindrical barrel part, and the elastic body maintains a state of contact with an inner peripheral surface of the cylindrical barrel part along an entire circumference at a portion between the wave generator and the diaphragm. ### Claim 3 (depends on 2) The wave gear device according to claim 2, wherein the partition mechanism has a support member for supporting the elastic body, a circular groove is formed on an outer peripheral surface of the support member and along the outer peripheral surface, and the elastic body is mounted in the circular groove. ### Claim 4 (depends on 3) The wave gear device according to claim 3, wherein the support member has an end surface facing the wave generator, and the end surface is a flat surface perpendicular to a center axis of the wave generator, or a concave conical surface centered on a position on the center axis. ### Claim 5 (depends on 3) The wave gear device according to claim 3, wherein the support member is made from steal, non-ferrous metal or plastic. ### Claim 6 (depends on 1, 2, 3, 4, 5) The wave gear device according to any one of claims 1 to 5, further comprising: an output flange; a holding member; and fastening bolts for fastening the holding member, the boss and the output flange in a state in which the boss is sandwiched between the holding member and the output flange, wherein the flexible externally toothed gear is a cup-shaped flexible externally toothed gear. ### Claim 7 (depends on 1) The wave gear device according to claim 1, further comprising: an output flange; a holding member; and fastening bolts for fastening the holding member, the boss and the output flange in a state in which the boss is sandwiched between the holding member and the output flange, wherein the flexible externally toothed gear is a cup-shaped flexible external gear, the partition mechanism has an elastic body capable of elastically deforming with the cylindrical barrel part, the holding member has a support portion for supporting the elastic body, a circular groove is formed on an outer peripheral surface of the supporting portion and along the outer peripheral surface, the elastic body is mounted in the circular groove, and the elastic body is located at a position between the wave generator and the diaphragm, and maintains a state of contact with an inner peripheral surface of the cylindrical barrel part along an entire circumference of the elastic body. ### Claim 8 (depends on 7) The wave gear device according to claim 7, wherein the support portion has an end surface facing the wave generator, and the end surface is a flat surface perpendicular to a center axis of the wave generator, or a concave conical surface centered on a position on the center axis. ### Claim 9 (depends on 7, 8) The wave gear device according to claim 7 or 8, wherein the support portion is made from steal, non-ferrous metal or plastic. ### Claim 10 (depends on 1, 2, 3, 4, 5) The wave gear device according to any one of claims 1 to 5, further comprising an output shaft, wherein the flexible externally toothed gear is a silk hat-shaped flexible externally toothed gear, and the boss of the flexible externally toothed gear is coaxially fastened to an outer peripheral portion of the output flange. ### Claim 11 (depends on 3, 4, 5) The wave gear device according to any one of claims 3 to 5, wherein the flexible externally toothed gear is a silk hat-shaped flexible externally toothed gear, the boss of the flexible external gear is coaxially fastened to an outer peripheral portion of the output flange, and the support member is coaxially fastened to a center portion of the output flange.