Abstract: The radius of curvature r1, r2 of the cross-sectional shape of an inner ring raceway lid is made smaller at a central portion 19 and larger at end portions 20. A contact ellipse at the end portions is made small by increasing the radius of curvature r2 of the end portions 20 to thereby secure an allowable moment load. In contrast with this, an angular gap is reduced by reducing the radius of curvature r1 of the central portion 19.

Abstract: A communication robot includes a speaker. By generating a sound or voice through the speaker, the human is requested to cause a robot to make a certain action. When the human makes an action to the robot, the movement of the robot head or arm assists for the action.

Abstract: A radial ball bearing 14 of the three point contact type or four point contact type is used for the rolling bearing for a compressor pulley. The offset amount &dgr;, that is the axial distance between the center &agr; of the radial load applied to the follower pulley 4 from the endless belt 11, and the center &bgr; of the radial ball bearing 14 is 40% or less of the diameter of the pitch circle. In addition, the radial clearance of the radial ball bearing 14 is 0.2% or less of the diameter of the pitch circle. With this construction, the durability of the rolling bearing to support the follower pulley 4 is secured while made compact.

Abstract: In a rolling bearing structured such that a plurality of rolling elements are respectively held between inner and outer rings by a retainer, grease is sealed in by a seal, a rotary body with the outer ring fitted therewith and a shaft with the inner ring fitted therewith can be connected together by a clutch mechanism and, when the rotary body and shaft are connected together by the clutch mechanism, the rolling bearing can be used on receiving a rotation load while the relative rotation between the inner and outer rings is zero, an initial radial clearance between the inner and outer rings is set such that a bearing effective clearance when the present rolling bearing is incorporated into between the rotary body and shaft can provide a positive value.

Abstract: The radius of curvature r1, r2 of the cross-sectional shape of an inner ring raceway 11d is made smaller at a central portion 19 and larger at end portions 20. A contact ellipse at the end portions is made small by increasing the radius of curvature r2 of the end portions 20 to thereby secure an allowable moment load. In contrast with this, an angular gap is reduced by reducing the radius of curvature r1 of the central portion 19.

Abstract: A ball bearing 36 supports a rotor 35 of an electromagnetic clutch 31 in such a manner that the rotor 35 can be rotated about the axis of the ball bearing 36. The ball bearing 36 includes an outer race 12, an inner race 13, a ball 14, and a retainer 15. The outer and inner races 12 and 13 are each formed in a circular-ring shape. The ball 14 is rollingably interposed between the outer and inner races 12 and 13. In the inner peripheral surface 16 and outer peripheral surface 17 of the outer and inner races 12 and 13, there are respectively formed grooves 12a and 13a each of which extends along the race peripheral direction and has an arc-shaped section. The grooves 12a and 13a are each formed in such a range in which their respective radii of curvature re and ri satisfy 1.0≦(re+ri)/Da≦0.9746 (Da/dm)−0.0304, where Da: the diameter of the ball, and dm: the mean value of the diameters of the inner and outer races of the ball bearing.

Abstract: A vehicle seat provided with a seat cushion the support frame of which is supported by a suspension mechanism, wherein the suspension mechanism includes a torsion bar spring loaded to resiliently support the support frame of the seat cushion, and wherein a spring adjustment mechanism is assembled with the suspension mechanism for adjusting the resilient force of the torsion bar spring.

Abstract: An omnidirectional vision sensor, which consists of a rotationally symmetrical convex mirror and a camera arranged opposite to the mirror, with clear and high quality image without having any disturbance due to the internal reflection of the light raised on the inner surface of the cylinder. The rays of light which internally reflect inside the cylinder pass through the production line of the rotational axis of the convex mirror, and thus these rays are eliminated before they reach the inner surface of the transparent cylinder. A tapered object on the vertex of the convex mirror is used to completely eliminate inner reflected rays of light.