Provided is a planetary gear reduction device (1) equipped with: a sun gear (5) that is affixed concentric with respect to the input shaft for the motive power and has external teeth; multiple planet gears (7) that have external teeth and mesh with the aforementioned sun gear (5); a ring gear (9) that has internal teeth and meshes with the aforementioned planet gears (7); a planet gear (11) that supports he multiple planet shafts (13), which are the axes of rotation for each of the planet gears (7), and that outputs the orbital motion of the multiple planet gears (7) as first motive power; and a tubular support member (27) that is connected so as to be unable to rotate relative to the ring gear (9) and that outputs the rotation of the ring gear (9) as second motive power. A flexible structure (41) having a V-shaped vertical cross section that is recessed toward the inner diameter is provided at one location in the axial central direction of the tubular support member (27). Thus, rigidity can be ensured and misalignment can be prevented while limiting an increase in the weight of the device.

Planetary gear reducer

Involves a trajectory extraction step (S2) for extracting the relative movement trajectory of the convex teeth pins (12b) of a mating gear (a fixed shaft) (12) in relation to a concave-convex gear (an oscillating gear) (15) when transmitting power between the mating gear (12) and the concave-convex gear (15), and a processing step (S4) for, when processing the concave teeth (15b) of the concave-convex gear in the concave teeth forming surface of a disk-shaped workpiece that is unprocessed with the concave teeth (15b), moving at least either a disk-shaped workpiece or a processing tool in a manner such that the relative movement trajectory of the processing tool in relation to the disk-shaped workpiece matches the relative movement trajectory of the convex teeth pins (12b) in relation to the concave convex gear (15), which was extracted in the trajectory extraction step.

Processing method and processing device for concave-convex gear

The invention provides a method for grinding a face gear by a formed grinding wheel The face gear 1, a plate grinding wheel 2 and a straight gear 3 as well as a diamond pen 4 and a saucer grinding wheel 5 which are used for finishing a worm are adopted in the method The method is characterized in that during the machining process, the face gear 1 rotates around Z-f, and the plate grinding wheel 2 rotates around an axis Zw thereof at a constant rotating speed and swings around an axis of a gear shaper cutter 3 at the same time; every time when the plate grinding wheel swings at an angle, the plate grinding wheel performs back-and-forth feed movement for once along the radial direction of the face gear in a cyclic manner until one complete tooth space is machined; and after one complete tooth space is machined, the face gear performs indexing movement for machining the next tooth space until one complete face gear is machined The method provided by the invention has the beneficial effects that by adopting the existing formed gear grinding wheel and gear grinding equipment, high-precision generation of the tooth surface of the face gear is realized, the effect of high-precision machining of the face gear is achieved, and the comprehensive transmission performance of the face gear is improved

Method for grinding face gear by formed grinding wheel

A planetary gear system (P) includes a sun gear (2), a ring gear (4) a carrier (6) located between the sun and ring gears (2, 4), and planet pinions (8, 10) organized in two arrays and supported on flexpin assemblies (32, 34) in the carrier (6). All of the gearing is helical, with the sun and ring gears (2, 4) having their teeth arranged in at double helix angles (herringbone) and the planet gears (8, 10) at single helix angles. The pinions (8) of the one array engage the teeth of one angle on the sun and ring gears (2, 4) and the pinions (10) of the other array engage the teeth of the other angle on the sun and ring gears (2, 4). Torque transfers through the carrier (6) through two torque paths (a, b) - one to the flexpin assemblies (32) for one array and the other to the flexpin assemblies (34) of the other array - and the paths (a) is stiffer than the path (b). Owing to the helical cut of the teeth the planet pinions (8, 10) of the two arrays exert oppositely directed axial forces (A) on the sun gear (2). The sun gear (2) is free to shift axially or float with respect to the planet pinions (8, 10) of the two arrays, so the axial forces (A) imparted to the sun gear, while opposite, are equal. Hence, the tangential forces (T), which transfer the torque, are likewise equal, notwithstanding the difference in flexibility of the two torque paths (a, b). Even though the carrier (6) may undergo different deflections at the flexpin assemblies (32, 34) for the two arrays of planet pinions (8, 10), the planet pinions (8, 10) of the two arrays transfer torques of equal magnitude.

Two-array planetary gear system with flexpins and helical gearing

A planetary gear reducer (1) includes: a sun gear (5) having external teeth and fixed concentrically to a power input shaft (3); a plurality of planet gears (7) having external teeth and mashing with the sun gear (5); a ring gear (9) having internal teeth and meshing with the planet gears (7); a planet carrier (11) configured to support a plurality of planet shafts (13), each of which is a rotational axis of a corresponding one of the planet gears (7), and to output revolution of the plurality of planet gears (7) as first power; and a cylindrical support (27) connected to the ring gear (9) such that the cylindrical support (27) is non-rotatable relative to the ring gear (9), the cylindrical support (27) being configured to output rotation of the ring gear (9) as second power. The cylindrical support (27) includes, at its one part along the direction of a central axis, a flexible structure (41) which is curved radially inward and has a V-shaped longitudinal section. This configuration makes it possible to both obtain rigidity and prevent misalignment while suppressing an increase in the weight of the gear reducer.

Planetary gear reduction device

PROBLEM TO BE SOLVED: To provide a manufacturing method and machining device for a face gear that can lower the cost of a high-speed and heavy-load speed change gear for a helicopter transmission and the like. SOLUTION: The machining device for a face gear wheel comprises a cutting means for feeding a milling cutter 11A with a straight or near-straight tooth shape in a radial direction of a face gear wheel 3 while adjusting the pressure angle of the face gear wheel 3 to a proper value, and a grinding means for feeding a disklike grinding wheel in a radial direction of the face gear wheel 3 while adjusting the pressure angle of the face gear wheel 3 to a proper value. The cutting and grinding work manufactures the face gear wheel 3.

Manufacturing method and machining device for face gear wheel

PROBLEM TO BE SOLVED: To reduce cost of a speed change device of high speed and high load by executing topological cutting while adjusting so that face gear wheel pressure angle becomes a correct value, by the use of a milling cutter having tooth profile of straight line or similar to a straight line. SOLUTION: In a face gear, a straight tooth profile changing pressure angle at respective positions in the radial direction, a small bow shaped curved tooth profile, or a curved tooth profile curved inside and outside against a reference straight line is formed by topological cutting. When the straight tooth profile or the tooth profile similar to a straight line is manufactured by a face gear machining device 10, a milling cutter having the straight tooth profile or the tooth profile similar to a straight line is used, and cutting is executed so that the pressure angle of the face gear wheel becomes a correct value by adjusting the angle of a C1 axis according to the respective positions of the Z-axis. COPYRIGHT: (C)2000,JPO

Face gear set, manufacture of face gear wheel, and machining device thereof

A cooling mechanism for a gear is provided with: a gear comprising a plurality of teeth that extend in a specific direction; and a nozzle that sprays oil toward the tooth surfaces of the gear. The nozzle extends in a specific direction and has a narrower width than the intervals between the tips of the plurality of teeth.

Cooling mechanism for gear

PROBLEM TO BE SOLVED: To provide a planetary gear speed reducer superior in service life performance by restraining the occurrence of misalignment. SOLUTION: The planetary gear device (1) includes: a sun gear (5) having external teeth; a plurality of planet gears (7) having external teeth and meshing with the sun gear (5); a ring gear (9) having internal teeth and meshing with the planet gears (7); and a planet carrier (11) which supports a plurality of planet shafts (13) which are rotational axes of the plurality of planet gears (7) by an annular base plate (17) integrally formed at one-end sides (33) of the planet shafts (13) to support the one-end sides and an annular back plate (19) which supports other ends of the plurality of planet shafts, and relatively positions the plurality of planet gears. In the planet shafts (13) or the planet carrier (11), rigidity in the vicinity of the one end-side portions (33) of the planet shafts is set lower than rigidity in the vicinity of the other ends. COPYRIGHT: (C)2010,JPO&INPIT

Planetary gear speed reducer

PROBLEM TO BE SOLVED: To provide an oil supply structure to a planetary gear device capable of using a seal ring even when a pressure of a lubrication oil is high or a circumferential speed is fast.SOLUTION: An oil supply structure to a planetary gear device includes: a planetary gear device including a cylindrical body which is the cylindrical body rotating with a carrier for holding a planetary gear and in which a lubrication oil introduction port is formed; an annular body which is the annular body for sliding with the cylindrical body and including a lubrication oil supply passage communicating with the lubrication oil introduction port; a pair of seal rings which is mounted on the cylindrical body or the annular body on both sides of the lubrication oil introduction port in the axial direction; a bypass passage for bypassing each of the pair of seal rings; and a pair of decompression mechanisms arranged between the pair of seal rings and the lubrication oil introduction port or outside of the pair of seal rings, and for restricting the flow of the lubrication oil between the cylindrical body and the annular body.SELECTED DRAWING: Figure 1

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Papers

Manufacturing method and machining device for face gear wheel

Face gear set, manufacture of face gear wheel, and machining device thereof

Cooling mechanism for gear

Planetary gear speed reducer

Oil supply structure to planetary gear device

広文 赤堀

Papers

Manufacturing method and machining device for face gear wheel

Face gear set, manufacture of face gear wheel, and machining device thereof

Cooling mechanism for gear

Planetary gear speed reducer

Oil supply structure to planetary gear device

広文赤堀