Abstract: A rolling bearing makes use of a porous rolling element and a selected kind of lubricant to impregnate with; is usable in various conditions; does not discharge foreign objects; and features low dust generation and long life. The rolling bearing includes an outer ring 2; an inner ring 1; and a plurality of rolling elements 3 assembled between mutually opposed outer ring track surface 2a and inner ring track surface 1a. The plurality of rolling elements 3 is provided by a combination of a porous rolling element 3a impregnated with a lubricant and a non-porous rolling element 3b.

Abstract: An object of the present invention is to provide a rolling bearing which makes use of a porous rolling element and a selected kind of lubricant to impregnate with; is usable in various conditions; does not discharge foreign objects; and features low dust generation and long life. A rolling bearing includes an outer ring 2; an inner ring 1; and a plurality of rolling elements 3 assembled between mutually opposed outer ring track surface 2a and inner ring track surface 1a. The plurality of rolling elements 3 is provided by a combination of a porous rolling element 3a impregnated with a lubricant and a non-porous rolling element 3b.

Abstract: A double-row angular contact ball bearing for a CT scanning device includes an inner member including a pair of raceway rings. The raceway rings have positioning holes into which a positioning member is inserted, to thereby suppress radial decentering of the raceway rings. Both the raceway rings are fastened by fixing bolts. The raceway rings have opposed end surfaces, and are fastened by the fixing bolts to bring the end surfaces into abutment against each other to apply a preload at a fixed position between balls and raceway surfaces. The following relationship is set: Db/h?0.26, where Db represents a diameter of each of the balls, and h represents a radial dimension from a center of each of the balls to an inner diameter of the inner member.

Abstract: A double-row angular contact ball bearing for a CT scanning device includes an inner member including a pair of raceway rings. The raceway rings have positioning holes into which a positioning member is inserted, to thereby suppress radial decentering of the raceway rings. Both the raceway rings are fastened by fixing bolts. The raceway rings have opposed end surfaces, and are fastened by the fixing bolts to bring the end surfaces into abutment against each other to apply a preload at a fixed position between balls and raceway surfaces. The following relationship is set: Db/h?0.26, where Db represents a diameter of each of the balls, and h represents a radial dimension from a center of each of the balls to an inner diameter of the inner member.

Abstract: A rotation transmission device includes coaxial input and output shafts (1 and 2), a pair of opposed bevel gears (3 and 4) rotatably mounted around the input shaft (1), and an intermediate bevel gear (5) meshing with the opposed bevel gears (3 and 4). The output shaft (2) and one of the opposed bevel gears (3) are rotationally fixed to each other. A first one-way clutch (6) is provided through which the rotation of the input shaft (1) is transmitted to the one of the opposed bevel gears (3). A second one-way clutch (7) is provided through which the rotation of the input shaft (1) in the reverse direction is transmitted to the other of the opposed bevel gears (4). Thus, the output shaft (2) can be rotated in the normal direction irrespective of whether the input shaft (1) is rotated in the normal direction or in the reverse direction.

Abstract: A switching device includes input and output gears 14, 15, and a rotational direction switching mechanism 10 disposed between the input and output gears. The switching mechanism includes intermediate bevel gears 22 supported on an intermediate shaft 12 and meshing with input and output bevel gears 16, 17, a control gear 39 having a release arm portion 41 and a stopper arm portion 42, and a one-way clutch fitted in a radially inner surface of a clutch receiving portion integral with the input bevel gear 16. When a spring clutch 25 is used as the one-way clutch, an adaptor portion 30 is provided on a coupling member 28 of the spring clutch 25, which is fitted on the intermediate shaft 12. When a roller clutch 55 is used as the one-way clutch, an adaptor portion 57 of the same structure is provided on its inner ring 56.

Abstract: A clutch unit includes axially arranged input, output and reverse input gears, and a spring clutch. The input and output gears respectively include radially opposed input and output clutch portions. The spring clutch is tightly bound to the input clutch portion and includes coil springs each having transmission and release hooks. With the transmission hooks in engagement with the output clutch portion, the release hooks are spaced forward from the transmission hooks. From an unlocking state, when the release portion is reverse rotated by distance c while pushing the release portions, the spring clutch is unlocked, and when a reverse rotational portion is reverse rotated by distance b, it engages a reverse rotation engaging portion. When the release portion is further reverse rotated after the spring clutch has been unlocked by distance a, the release portion engages the hook engaging portion and stops. a>b>c.

Abstract: A rotation transmission device is provided which is simple in structure and which can stably transmit rotation. It includes input and output shafts (1 and 2) which are coaxial with each other, a pair of opposed bevel gears (3 and 4) rotatably mounted around the input shaft (1), and an intermediate bevel gear (5) meshing with the opposed bevel gears (3 and 4). The output shaft (2) and one of the opposed bevel gears (3) are rotationally fixed to each other. A first one-way clutch (6) is provided through which the rotation of the input shaft (1) is transmitted to the one of the opposed bevel gears (3). A second one-way clutch (7) is provided through which the rotation of the input shaft (1) in the reverse direction is transmitted to the other of the opposed bevel gears (4). Thus, the output shaft (2) can be rotated in the normal direction irrespective of whether the input shaft (1) is rotated in the normal direction or in the reverse direction.

Abstract: The object is to provide a switching device for switching driving force between forward and reverse directions in which the same intermediate shaft can be used both when a spring clutch is used and when a roller clutch is used. The switching device includes an input gear 14, an output gear 15, and a switching mechanism 10 for switching the rotational direction disposed between the input and output gears. The switching mechanism 10 includes an intermediate bevel gears 22 supported on an intermediate shaft 12 and meshing with an input bevel gear 16 and an output bevel gear 17, a control gear 39 having a release arm portion 41 and a stopper arm portion 42, and a one-way clutch fitted in a radially inner surface of a clutch receiving portion integral with the input bevel gear 16. When a spring clutch 25 is used as the one-way clutch, an adaptor portion 30 is provided on a coupling member 28 of the spring clutch 25, which is fitted on the intermediate shaft 12.

Abstract: The object is to improve the control of a spring clutch, thereby simplifying the structure of a rotational direction switching clutch unit and thus reducing its cost. The clutch unit includes an input gear 12, an output gear 13 and a reverse input gear 14 which are axially arranged, and a spring clutch 26. The input gear 12 includes an input clutch portion 15, and the output gear 13 includes an output clutch portion 16 that is radially opposed to the input clutch portion 15. The spring clutch 26 is tightly bound to the input clutch portion 15. The spring clutch includes coil springs 27 each having a transmission hook 28 at one end and a release hook 29 at the other end. With the transmission hooks 28 in engagement with a hook engaging portion 21 of the output clutch portion 16, the release hooks 29 are spaced in a forward rotational direction from the transmission hooks 28 by a predetermined distance.