Abstract: In an electromagnetic clutch, a rotor includes a cover portion that covers a radially outer end of an armature from a radially outer side. The cover portion, the radially outer end of the armature, and a wall of the rotor define a discharge passage that is formed into a ring shape centered on a rotating shaft and is open on a first end side in an axis line direction for discharging abrasion powder generated by friction between walls. The cover portion includes a tapered surface that is shaped such that an area in a cross sectional plane of the discharge passage which is orthogonal to an axis of the rotating shaft becomes larger toward the first end side in the axis line direction.

Abstract: In an electromagnetic clutch, a rotor includes a cover portion that covers a radially outer end of an armature from a radially outer side. The cover portion, the radially outer end of the armature, and a wall of the rotor define a discharge passage that is formed into a ring shape centered on a rotating shaft and is open on a first end side in an axis line direction for discharging abrasion powder generated by friction between walls. The cover portion includes a tapered surface that is shaped such that an area in a cross sectional plane of the discharge passage which is orthogonal to an axis of the rotating shaft becomes larger toward the first end side in the axis line direction.

Abstract: A power transmission device includes a pulley 1 and a hub 2 having an inner hub 21, a rubber damper 22 and an outer hub 23. A hub side engagement portion 24 formed of an elastic material and arranged at either one, or both, of an inner peripheral surface and an outer peripheral surface of the outer hub engages with a pulley side engagement portion 12, which is arranged at a position corresponding to the outer hub, of the pulley in a concavo-convex fitting to thereby constitute a torque transmission structure between the hub and the pulley. The hub side engagement portion and the pulley side engagement portion have a concavo-convex outer shape and mesh with each other. A ring-like dust invasion prevention portion 28 covers a front surface of said concavo-convex fitting.

Abstract: A hub for use in a power transmission apparatus comprises cylindrical portion 81 and outer ring 83 including a plurality of tongue-like reinforcing portions 83c each protruded radially inward from the peripheral end of the corresponding one of the plurality of protrusions 83b. When the distance from point C where the rear-side end surface of the cylindrical portion 81 and hub-side engaging portion 85 are connected with each other, to rear-side end surface D of reinforcing portions 83c is given a, and the distance from rear-side end surface D of reinforcing portions 83c to radially innermost front-side portion E is given b, distance b is less than one half of distance a.

Abstract: A power transmission device includes a pulley 1 and a hub 2 having an inner hub 21, a rubber damper 22 and an outer hub 23. A hub side engagement portion 24 formed of an elastic material and arranged either one, or both, of inner peripheral surface and outer peripheral surface of the outer hub engages with a pulley side engagement portion 12, arranged at a position corresponding to the outer hub, of the pulley in concavo-convex fitting to thereby constitute a torque transmission structure between the hub and the pulley. The hub side engagement portion and the pulley side engagement portion have a concavo-convex outer shape and mesh with each other.

Abstract: A power transmission apparatus includes a pulley 1 having a belt attached thereto to transmit the rotating drive force, a hub 2 which connects the pulley to a rotating shaft of a driven device, a bearing 7 which rotatably supports the pulley, and a sleeve ring 5 which is fitted and secured to the pulley and attaches the bearing to the pulley to prevent it relatively moving. The sleeve ring is provided, on its first end opposite to the driven device, with a bent portion 5b against which the bearing abuts to restrict further movement of the bearing. An annular retainer 6 is provided on the portion of the bearing adjacent to the drive device. The bearing is secured to the sleeve ring through the annular retainer by calking a second end 5a of the sleeve ring opposite to the first end. The sleeve ring is provided with a projection 5f which projects in the axial direction from the rear surface of the pulley and a casing 9 is provided with an annular groove 9c which at least partly receives therein the projection.

Abstract: A power transmission system including an integrally molded hub and elastic member, where stress is inhibited from concentrating at the gate marks remaining after integral molding. In a pulley driven by a belt, a plastic pulley side relief section 1a provided at a pocket section of the pulley and a plastic hub side relief section provided on an iron outer ring of the hub engaged at the pocket section whereby power is transmitted from the pulley to the shaft. The hub side relief section and outer ring forming parts of the hub, the iron inner hub to be fastened to the shaft, and the plastic cylindrical part are integrally molded so that the gate mark for plastic injection is formed near to or further to the outer circumference of the outer ring.

Abstract: An aspect of the present invention inheres in a semiconductor light-emitting element includes a light-emitting functional stacked body including a light-emitting region having a light-emitting function, and including a light extraction surface for extracting light emitted from the light-emitting region, and an upward convex lens disposed on the light extraction surface.

Abstract: A power transmission device includes: a pulley 1 rotatably attached to a casing 9; a hub 2 connected to the pulley 1 by an engagement of protrusions with recesses; and a power shutoff member 3 interposed between the hub 2 and a rotary shaft 4. The power shutoff member and the rotary shaft 4 are joined to each other by means of screwing. When a water intrusion path formed between a hub side seating face of the hub and a shaft side seating face 44 of the rotary shaft is formed into a labyrinth structure, water is prevented from entering the seating face. An engagement portion 35 on the power shutoff member side is engaged with a hub side engagement portion 21a so that it can be accommodated in the hub side engagement portion 21a, and the power shutoff member can be rotated together when the hub is rotated. An engagement gap formed between a power shutoff member side engagement portion and a hub side engagement portion in the radial direction perpendicular to an axis of the rotary shaft is in a range from 0.

Abstract: A bearing according to the present invention includes a cylindrical member formed on and around an outer member of a usual bearing. To firmly connect the cylindrical member to the outer member, grooves having an inclination relative to the axial direction of the bearing are formed so that the grooves do not cross one another on the outer surface of the outer member. The cylindrical member is made of a resin material by molding, and the resin, which is melted by heat in the molding process, enters into and adheres to the grooves. In this manner, the cylindrical member is firmly connected to the outer member so that movement in both of the rotational and axial directions of the bearing is prevented. The grooves formed on the outer surface of the outer member may be grouped, and their inclination relative to the axial direction may be alternately reversed group by group.

Abstract: A semiconductor light-emitting device includes a substrate having two main surfaces; and an active layer forming part, which is made of a compound semiconductor material, formed on one of the main surfaces, and includes an active layer. A plurality of holes, which pass through the active layer, are formed from the upper surface of the active layer forming part; a plurality of hollow parts, each of which corresponds to each hole, are provided between the active layer and the substrate; and the area of each hollow part is larger than that of the corresponding hole in plan view, and spreads on the lower surface of the active layer forming part, so as to expose a part of the lower surface of the active layer forming part, which overlaps the hollow part in plan view.

Abstract: A light-emitting device has a main semiconductor region formed via an n-type AlInGaN buffer region on a p-type silicon substrate, the latter being sufficiently electroconductive to provide part of the current path through the device. Constituting the primary working part of the LED, the main semiconductor region comprises an n-type GaN layer, an active layer, and a p-type GaN layer, which are successively epitaxially grown in that order on the buffer region. A heterojunction is created between p-type substrate and n-type buffer region. Carrier transportation from substrate to buffer region is expedited by the interface levels of the heterojunction, with a consequent reduction of the drive voltage requirement of the LED.

Abstract: A light-emitting diode is built on a silicon substrate which has been doped with a p-type impurity to possess sufficient conductivity to provide part of the current path through the LED. The p-type silicon substrate has epitaxially grown thereon a buffer region of n-type AlInGaN. Further grown epitaxially on the buffer region is the main semiconductor region of the LED which comprises a lower confining layer of n-type GaN, an active layer for generating light, and an upper confining layer of p-type GaN. In the course of the growth of the buffer region and main semiconductor region there occurs a thermal diffusion of gallium and other Group III elements from the buffer region into the p-type silicon substrate, with the consequent creation of a p-type low-resistance region in the substrate. Interface levels are created across the heterojunction between p-type silicon substrate and n-type buffer region.

Abstract: A power transmission device (10) comprises a rotatable rotary part (1, 2) to which a rotational drive force is transmitted from a drive source and a power transmission shut-off member (3) that shuts off transmission of an excessive torque between the rotary part and a rotating shaft (4) of a device to be driven. The power transmission shut-off member is threadedly coupled to the rotating shaft and can rotate with the rotating shaft. The rotary part is installed so as to be sandwiched between the power transmission shut-off member and the rotating shaft. A disc spring (8), installed between the power transmission shut-off member and the rotary part, is further provided. A caulked part (204a) for preventing a part of the power transmission shut-off member from dropping is provided on the front end side of the rotating shaft.

Abstract: A power transmission device includes a pulley 1 and a hub 2 having an inner hub 21, a rubber damper 22 and an outer hub 23. A hub side engagement portion 24 formed of an elastic material and arranged at either one, or both, of an inner peripheral surface and an outer peripheral surface of the outer hub engages with a pulley side engagement portion 12, which is arranged at a position corresponding to the outer hub, of the pulley in a concavo-convex fitting to thereby constitute a torque transmission structure between the hub and the pulley. The hub side engagement portion and the pulley side engagement portion have a concavo-convex outer shape and mesh with each other. A ring-like dust invasion prevention portion 28 covers a front surface of said concavo-convex fitting.

Abstract: A power transmission apparatus includes a pulley 1 having a belt attached thereto to transmit the rotating drive force, a hub 2 which connects the pulley to a rotating shaft of a driven device, a bearing 7 which rotatably supports the pulley, and a sleeve ring 5 which is fitted and secured to the pulley and attaches the bearing to the pulley to prevent it relatively moving. The sleeve ring is provided, on its first end opposite to the driven device, with a bent portion 5b against which the bearing abuts to restrict further movement of the bearing. An annular retainer 6 is provided on the portion of the bearing adjacent to the drive device. The bearing is secured to the sleeve ring through the annular retainer by calking a second end 5a of the sleeve ring opposite to the first end. The sleeve ring is provided with a projection 5f which projects in the axial direction from the rear surface of the pulley and a casing 9 is provided with an annular groove 9c which at least partly receives therein the projection.

Abstract: A power transmission apparatus (10) includes a rotary portion (1) to which turning driving force from a driving source is transmitted and which can rotate, a power cutoff member (3) mechanically connected to the rotary portion (1) and one of the ends of a rotary shaft (5) of a driven apparatus and cutting off transmission of excessive torque between them, and a cap (4) connected to the end of the rotary shaft (5) on one hand and fastened by screw meshing to the power cutoff member (3) on the other hand, and transmitting power from the power cutoff member (3) to the rotary shaft (5). The rotary portion (1), the power cutoff member (3), the cap (4) and the rotary shaft (5) all rotate integrally with one another. The cap (4) has a flange portion (4h) protruding in a radial direction with respect to an axis of the rotary shaft (5) and supporting an axial force.

Abstract: An aspect of the present invention inheres in a semiconductor light-emitting element includes a light-emitting functional stacked body including a light-emitting region having a light-emitting function, and including a light extraction surface for extracting light emitted from the light-emitting region, and an upward convex lens disposed on the light extraction surface.

Abstract: In a power transmission 1 in which a pulley 2 and a hub 5 are engaged with each other, in protrusions 51 of the hub 5 side and in protrusions 22 of the pulley 2 side located on an outer circumferential side with respect to an outer hub 53, an annular dust flange 51d is provided which protrudes and expands to the outside in the radial direction from a front side portion which adjoins protrusions 51c of an elastic portion 52. When an outer circumferential end of this dust flange 51d is elastically, tightly contacted with a sealing portion 23 of the pulley 2, a front face of the protrusions 22 can be completely covered.

Abstract: A hub for use in a power transmission apparatus comprises cylindrical portion 81 and outer ring 83 including a plurality of tongue-like reinforcing portions 83c each protruded radially inward from the peripheral end of the corresponding one of the plurality of protrusions 83b. When the distance from point C where the rear-side end surface of the cylindrical portion 81 and hub-side engaging portion 85 are connected with each other, to rear-side end surface D of reinforcing portions 83c is given a, and the distance from rear-side end surface D of reinforcing portions 83c to radially innermost front-side portion E is given b, distance b is less than one half of distance a.