龍彦 五井

Bio: 龍彦 五井 is an academic researcher. The author has contributed to research in topics: Pressure angle & Machining. The author has an hindex of 3, co-authored 4 publications receiving 20 citations.

Manufacturing method and machining device for face gear wheel

Abstract: 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.

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

Abstract: 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

Low-loss gear device

Abstract: PROBLEM TO BE SOLVED: To decrease the supply amount of lubricating oil, reduce loss due to such decrease, and further reduce the pressure of air around a gear to thereby decrease windage loss by supplying the lubricating oil to a meshing part of gears in the mist lubricating state in a small amount. SOLUTION: This low-loss gear device is a gear box 1 in which gear trains 21, 31, 32, 41 are housed in a case 4. The plurality of gears 32, 41 meshing with each other are covered with a shroud 16, the shroud 16 is provided with a lubricating oil supply port 19 for supplying lubricating oil to a meshing part 50 of the gears 32, 41 and a discharge port 10 for causing the air in the shroud 16 to flow out, the pressure in the shroud 16 is lowered by the pumping action of the gears, and also lubricating oil drawing action to the meshing part 50 of the gears 32, 41 is performed. COPYRIGHT: (C)2008,JPO&INPIT

Planetary gear speed reducer

Abstract: 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 reducer

Abstract: 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.

Lubricating system for gear train

Abstract: This invention provides a lubricating system for a gear train including: a lubricating oil supply port configured to supply a lubricating oil in a direction vertical to both axes of a pair of gears and toward a mesh point at which the pair of gears are meshed with each other; a shroud configured to cover at least teeth of the pair of gears so as to form a flow passage of the lubricating oil between the pair of gears and the shroud; and a pair of discharge ports respectively configured to discharge the lubricating oil from the flow passage. The pair of discharge ports are respectively positioned at two portions of the shroud respectively opposed to the mesh point across respective axes of the pair of gears.

Processing method and processing device for concave-convex gear

Abstract: 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.

Gear baffle configured with lubricant outlet passage

Abstract: A transmission system may include a first bevel gear, a second bevel gear and a baffle. The second bevel gear is meshed with the first bevel gear, and includes a plurality of gear teeth arranged in a circumferential array. The baffle includes a baffle wall and a baffle outlet. The baffle wall is arranged next to and covers a subset of the gear teeth. The baffle outlet forms a lubricant outlet passage that extends through the baffle wall.

Gear train lubricating device

Abstract: A lubrication device, which is for a gear train (5) having a plurality of gears which engage with one another, is provided with a shroud (7) which covers the gear train (5), and a housing (9) which covers the shroud (7). The shroud (7) comprises an oil-supply nozzle (25) which supplies oil (OL) to engaging sections (21) of the gear train (5), and oil drain ports (41) for discharging the oil (OL). The housing (9) comprises suck-out ports (43) which are in the lower part of the housing and which suck the oil (OL) discharged from the oil drain ports (41) out to the outside. A guide body (47) is provided between the shroud (7) and the housing (9) and guides the oil (OL) which has been discharged from the oil drain ports (41) in the shroud (7) downward through the space (S) between the shroud (7) and the housing (9).