Gear mechanism, planetary gear device, rotating bearing device, and magical planetary gear speed reducer

A rotating bearing device using a planetary gear device comprising a sun gear having a sun spur gear, an internal gear having an internal spur gear, and a planetary gear having a planetary spur gear meshed between the spur gears of the sun gear and internal gear, wherein

• the sun gear coaxially has a sun screw-shaped gear rotating integrally with the sun spur gear, the internal gear coaxially has a female screw-shaped gear rotating integrally with the internal spur gear, the planetary gear coaxially has a planetary screw-shaped gear rotating integrally with the planetary spur gear, the sun screw-shaped gear and the planetary screw-shaped gear are formed in screw shapes being in reverse directions to each other, equal in lead angle, and equal in screw pitch and are meshed with each other, the female screw-shaped gear of the internal gear and the planetary screw-shaped gear are formed in screw shapes equal in lead angle and equal in screw pitch to each other and are meshed with each other, the planetary spur gear is meshed with the sun spur gear and is also meshed with the internal spur gear, a ratio of effective screw diameters of the meshing sun screw-shaped gear and planetary screw-shaped gear is coincident with a ratio of screw thread numbers, and a ratio of effective screw diameters of the meshing female-screw-shaped gear and planetary screw-shaped gear is coincident with a ratio of screw thread numbers, and
• wherein the planetary gears are supported about axes at equiangular intervals around the sun gear, and a number of the planetary gears is equal to a sum of a thread number of the sun screw-shaped gear of the sun gear and a thread number of the female screw-shaped gear of the internal gear or a divisor of the sum of these threads numbers.

A two-stage planetary gear device for which a first-stage planetary gear mechanism comprising a sun gear having a sun spur gear and a planetary gear having a planetary spur gear meshed between the spur gears of the sun gear and an internal gear and a second-stage planetary gear mechanism comprising a sun gear having a sun spur gear and a planetary gear having a planetary spur gear meshed between the spur gears of the sun gear and the internal gear are disposed inside the common internal gear, and a planetary shaft of the first-stage planetary gear is coupled to the second-stage sun gear, wherein

• the first-stage and second-stage sun gears coaxially have sun screw-shaped gears rotating integrally with the sun spur gears, the common internal gear coaxially has a female screw-shaped gear rotating integrally with the internal spur gear, the first-stage and second-stage planetary gears coaxially have planetary screw-shaped gears rotating integrally with the planetary spur gears, the sun screw-shaped gear and the planetary screw-shaped gear are formed in screw shapes being in reverse directions to each other, equal in lead angle, and equal in screw pitch and are meshed with each other, the female screw-shaped gear of the internal gear and the planetary screw-shaped gear are formed in screw shapes equal in lead angle and equal in screw pitch to each other and are meshed with each other, the planetary spur gear is meshed with the sun spur gear and is meshed with the internal spur gear, a ratio of effective screw diameters of the meshing sun screw-shaped gear and planetary screw-shaped gear is coincident with a ratio of screw thread numbers, and a ratio of effective screw diameters of the meshing female-screw-shaped gear and planetary screw-shaped gear is coincident with a ratio of screw thread numbers, and
• wherein the planetary gears are supported about axes at equiangular intervals around the sun gear, and a number of the planetary gears is equal to a sum of a thread number of the sun screw-shaped gear of the sun gear and a thread number of the female screw-shaped gear of the internal gear or a divisor of the sum of these threads numbers.

A magical planetary gear mechanism having planetary gears comprising a pair of planetary spur gears at both coaxial ends of a screw-shaped gear, sun gears comprising a pair of sun spur gears meshed with the pair of planetary spur gears and a sun screw-shaped gear coaxially arranged with the sun spur gears, and internal spur gears comprising a pair of internal spur gears meshed with the pair of planetary spur gears, and female screw-shaped gears coaxially arranged with the internal spur gears,

• wherein the pair of sun spur gears is separated from the sun gears, or the pair of internal spur gears is separated from the internal spur gears,
• wherein a separated pair of sun spur gears or a separated pair of internal spur gears have a difference in a tooth number ratio relative to the pair of planetary spur gears,
• wherein the screw-shaped gears of the sun gears and the screw-shaped gears of the planetary gears are formed in screw shapes being in reverse directions to each other, equal in lead angle, and equal in screw pitch and are meshed with each other, the female screw-shaped gears of the internal gears and the screw-shaped gears of the planetary gears are formed in screw shapes equal in lead angle and equal in screw pitch to each other and are meshed with each other, a ratio of effective screw diameters of the meshing sun screw-shaped gears and planetary screw-shaped gears is coincident with a ratio of screw thread numbers, and a ratio of effective screw diameters of the meshing female-screw-shaped gears and planetary screw-shaped gears is coincident with a ratio of screw thread numbers, and
• wherein the planetary gears are supported about axes at equiangular intervals around the sun gears, a number of the planetary gears is equal to a sum of a thread number of the sun screw-shaped gears of the sun gears and a thread number of the female screw-shaped gears of the internal gears or a divisor of the sum of these threads numbers.

A magical planetary gear speed reducer comprising a fixed internal gear to be fixed, a plurality of planetary gears to be disposed at an inner circumferential side of the fixed internal gear, a sun gear to be disposed at an inner circumferential side of the plurality of planetary gears, and a driven internal gear to be disposed at an outer circumferential side of the plurality of planetary gears,

• wherein the planetary gear is provided with a first planetary spur gear and a second planetary spur gear, the fixed internal gear meshes with the second planetary spur gear, the first planetary spur gear meshes with a driven internal spur gear provided inside the driven internal gear, the sun gear is provided with a first sun spur gear and a second sun spur gear, the second sun spur gear meshes with the second planetary spur gear of the planetary gear, the first sun spur gear meshes with the first planetary spur gear of the planetary gear, and differences in a ratio of tooth number are provided between the fixed internal gear and the second planetary spur gear, and between the driven internal spur gear and the first planetary spur gear,
• wherein the sun gear coaxially has a sun screw-shaped gear rotating integrally with the first sun spur gear and the second sun spur gear, the driven internal gear coaxially has a driven female screw-shaped gear rotating integrally with the driven internal spur gear, the planetary gear coaxially has a planetary screw-shaped gear rotating integrally with the first planetary spur gear and the second planetary spur gear, the sun screw-shaped gear and the planetary screw-shaped gear are formed in screw shapes being in reverse directions to each other, equal in lead angle, and equal in screw pitch and are meshed with each other, the driven female screw-shaped gear of the driven internal gear and the planetary screw-shaped gear are formed in screw shapes, equal in lead angle and equal in screw pitch to each other, and are meshed with each other, the planetary spur gear is meshed with the sun spur gear and with the driven internal spur gear, a ratio of effective screw diameters of the meshing sun screw-shaped gear and planetary screw-shaped gear is coincident with a ratio of screw thread numbers, and a ratio of effective screw diameters of the meshing driven female-screw-shaped gear and planetary screw-shaped gear is coincident with a ratio of screw thread numbers, and
• wherein the planetary gears are supported about axes at equiangular intervals around the sun gear, a number of the planetary gears is equal to a sum of a thread number of the sun screw-shaped gear of the sun gear and a thread number of the driven female screw-shaped gear of the driven internal gear or a divisor of the sum of these threads numbers.