Abstract: Provided is a double-row roller bearing, which is capable of suppressing a frictional force from being increased due to variation in force of press contact between outer and inner rings and rollers to enable smoother relative rotational movement between the outer ring and the inner ring, and is also suitable for downsizing and higher in versatility.

Abstract: Provided is a ball joint capable of coupling a third mechanical element in a freely pivotable manner near a pivot center of a first mechanical element and a second mechanical element coupled to each other in a freely pivotable manner.

Abstract: Provided is a ball joint capable of coupling a third mechanical element in a freely pivotable manner near a pivot center of a first mechanical element and a second mechanical element coupled to each other in a freely pivotable manner.

Abstract: Provided is a double-row roller bearing, which is capable of suppressing a frictional force from being increased due to variation in force of press contact between outer and inner rings and rollers to enable smoother relative rotational movement between the outer ring and the inner ring, and is also suitable for downsizing and higher in versatility. The double-row roller bearing includes: the inner ring; the outer ring; and the plurality of rollers arranged between the inner ring and the outer ring. On an inner peripheral surface of the outer ring, a pair of lateral protruding portions continuous along a circumferential direction are formed at an interval in a direction of a rotation axis. On an outer peripheral surface of the inner ring, an intermediate protruding portion continuous along the circumferential direction is formed so as to be positioned between the lateral protruding portions.

Abstract: Provided is a method of manufacturing a spherical bearing having an inside member with a metal ball portion and an outside member having a ball support portion enclosing and supporting the ball portion of the inside member and connected to the inside member swingably or rotatably relative to each other, including the steps of performing injection molding in which the ball portion of the inside member is inserted as a core in a mold to mold a resin liner covering the ball portion, molding the outside member covering the resin liner by a casting in which the ball portion and the resin liner are inserted as a core in the mold, and after the completion of the casting, heating the resin liner covering the ball portion through the ball portion of the inside member.

Abstract: Provided is a seal plate (40) for a movement guide device that can be produced easily from optimal materials according to a usage environment of the movement guide device and can be produced simply at low cost. The seal plate (40) is mounted on a mobile block (2) that moves along a track rail (1) and closes a gap between the mobile block (2) and the track rail (1). The seal plate (40) includes a base material of a woven and knitted fabric or nonwoven fabric, and a binder component (40b) which is dispersed in the base material and partially binds together fibers (40a) which form the woven and knitted fabric or nonwoven fabric, and has a plurality of voids formed therein.

Abstract: A sealing member for a rolling device is applied to a rolling device with inner and outer members and a plurality of rolling members between so the rolling members can roll to allow relative rotational or linear movement of the outer member with respect to the inner member. The sealing member includes an inner and outer lip parts that press the inner and outer members, respectively. The outer lip part is less rigid than the inner lip part. The sealing member may have a substantially circular shape and surround the inner member. Alternatively, the sealing member may have a substantially plate-like shape and extend in a direction of relative movement of the outer member with respect to the inner member. The sealing member for a rolling device configured as described above and a rolling device provided with the sealing member can be adequately used even in a hostile environment.

Abstract: Provided is a motion guide device having a scooping portion that is not damaged even when a moving member is moved at high speed. When seen in an axial direction of a track shaft 1, a direction change path 10 is inclined relative to a contact angle line L1 (line connecting a center C of a ball 3 and a bottom P1 of a ball rolling groove 1a). The direction change path 10 including a scooping portion 17 has a cross section of Gothic arch groove shape formed of two arcs R1 in such a manner that the ball 3 is in contact with the direction change path 10 at two points. The direction change path 10 is twisted in such a manner that a locus 18 of the top of the Gothic arch groove shape approaches the contact angle line L1 at the scooping portion 17.

Abstract: Provided is a seal plate (40) for a movement guide device that can be produced easily from optimal materials according to a usage environment of the movement guide device and can be produced simply at low cost. The seal plate (40) is mounted on a mobile block (2) that moves along a track rail (1) and closes a gap between the mobile block (2) and the track rail (1). The seal plate (40) includes a base material of a woven and knitted fabric or nonwoven fabric, and a binder component (40b) which is dispersed in the base material and partially binds together fibers (40a) which form the woven and knitted fabric or nonwoven fabric, and has a plurality of voids formed therein.

Abstract: A thrust transfer device includes: a motor serving as a driving source; a sun gear rotatable to an output shaft of the motor, a plurality of nut members each provided with an outer peripheral external tooth meshed with the sun gear and provided with an inner peripheral nut side spiral screw groove; and a plurality of screw shafts, each provided, at an outer periphery thereof, with a screw side spiral screw groove corresponding to the nut side spiral screw groove, and reciprocally moved in accordance with nut rotation by fitting the screw side screw groove into the nut side screw groove; and an internal tooth gear meshed with the external tooth formed to each of the nut members. When the sun gear is rotated, the nut members perform planetary motion inside the internal tooth gear, by which the screw shafts are reciprocally moved in axial directions thereof.

Abstract: Provided is a method of manufacturing a spherical bearing having an inside member with a metal ball portion and an outside member having a ball support portion enclosing and supporting the ball portion of the inside member and connected to the inside member swingably or rotatably relative to each other, including the steps of performing injection molding in which the ball portion of the inside member is inserted as a core in a mold to mold a resin liner covering the ball portion, molding the outside member covering the resin liner by a casting in which the ball portion and the resin liner are inserted as a core in the mold, and after the completion of the casting, heating the resin liner covering the ball portion through the ball portion of the inside member.

Abstract: Provided is a method of manufacturing a spherical bearing having an inside member with a metal ball portion and an outside member having a ball support portion enclosing and supporting the ball portion of the inside member and connected to the inside member swingably or rotatably relative to each other, including the steps of performing injection molding in which the ball portion of the inside member is inserted as a core in a mold to mold a resin liner covering the ball portion, molding the outside member covering the resin liner by a casting in which the ball portion and the resin liner are inserted as a core in the mold, and after the completion of the casting, heating the resin liner covering the ball portion through the ball portion of the inside member.

Abstract: A sealing member for a rolling device is applied to a rolling device with inner and outer members and a plurality of rolling members between so the rolling members can roll to allow relative rotational or linear movement of the outer member with respect to the inner member. The sealing member includes an inner and outer lip parts that press the inner and outer members, respectively. The outer lip part is less rigid than the inner lip part. The sealing member may have a substantially circular shape and surround the inner member. Alternatively, the sealing member may have a substantially plate-like shape and extend in a direction of relative movement of the outer member with respect to the inner member. The sealing member for a rolling device configured as described above and a rolling device provided with the sealing member can be adequately used even in a hostile environment.

Abstract: A spindle driving mechanism 5 for a machine tool includes a screw shaft 11 formed with a spiral thread groove 11a in the outer peripheral surface thereof; a ball screw nut 12 that is provided with a spiral nut groove corresponding to the thread groove 11a in the inner surface thereof, and that is configured so as to perform reciprocating motion in the axis direction of the screw shaft 11 with the rotational motion of the screw shaft 11 around the axis; a hollow motor 21 including a cylindrical inner rotor 22 fixedly provided on the outer peripheral surface of the ball screw nut 12 to serve as a field flux producing source, and a cylindrical outer stator 23 for generating a rotating magnetic field for giving a rotational driving force to the inner rotor 22; a cylindrical casing 31 on one end side of which the outer stator 23 is fixedly provided and on the other end side of which a spindle 51 for the machine tool is fixedly provided; and an outer cylinder 41 for guiding the reciprocating motion of the casing 31

Abstract: Provided is a motion guide device having a scooping portion that is not damaged even when a moving member is moved at high speed. When seen in an axial direction of a track shaft 1, a direction change path 10 is inclined relative to a contact angle line L1 (line connecting a center C of a ball 3 and a bottom P1 of a ball rolling groove 1a) . The direction change path 10 including a scooping portion 17 has a cross section of Gothic arch groove shape formed of two arcs R1 in such a manner that the ball 3 is in contact with the direction change path 10 at two points. The direction change path 10 is twisted in such a manner that a locus 18 of the top of the Gothic arch groove shape approaches the contact angle line L1 at the scooping portion 17.

Abstract: A thrust transfer device includes: a motor serving as a driving source; a sun gear rotatable to an output shaft of the motor, a plurality of nut members each provided with an outer peripheral external tooth meshed with the sun gear and provided with an inner peripheral nut side spiral screw groove; and a plurality of screw shafts, each provided, at an outer periphery thereof, with a screw side spiral screw groove corresponding to the nut side spiral screw groove, and reciprocally moved in accordance with nut rotation by fitting the screw side screw groove into the nut side screw groove; and an internal tooth gear meshed with the external tooth formed to each of the nut members. When the sun gear is rotated, the nut members perform planetary motion inside the internal tooth gear, by which the screw shafts are reciprocally moved in axial directions thereof.

Abstract: Provided is a method of manufacturing a spherical bearing having an inside member with a metal ball portion and an outside member having a ball support portion enclosing and supporting the ball portion of the inside member and connected to the inside member swingably or rotatably relative to each other, including the steps of performing injection molding in which the ball portion of the inside member is inserted as a core in a mold to mold a resin liner covering the ball portion, molding the outside member covering the resin liner by a casting in which the ball portion and the resin liner are inserted as a core in the mold, and after the completion of the casting, and heating the resin liner covering the ball portion through the ball portion of the inside member.

Abstract: There are provided a spherical bearing and a method for manufacturing the same, in which both of a ball bearing section and a ball section made of metal can make light and smooth swinging and rotary motions for a long period of time without biased wear and seize-up of those members even if the solid bodies of them can contact with each other due to a discontinuous oil film under a heavy load. A resin liner that contacts the ball section of the inner member in a sliding relationship is embedded in the ball bearing section, and a resin sliding contact surface provided by the resin liner and the metal sliding surface are adjacent to each other without any gap to form a sliding contact surface at the bearing section.

Abstract: A rolling element interference preventer for a guide device prevents a number of rolling elements rolling at regular intervals in a continuous circulation path of the guide device from interfering with each other. The rolling element interference preventer is formed of a thermoplastic resin elastomer having a physical property in accordance with an expression, (A×B)÷C?18, where A represents a 10% elongation stress, B represents a tensile strength, and C represents a bending modulus of elasticity.

Abstract: A rolling element interference preventer for a guide device prevents a number of rolling elements rolling at regular intervals in a continuous circulation path of the guide device from interfering with each other. The rolling element interference preventer is formed of a thermoplastic resin elastomer having a physical property in accordance with an expression, (A×B)÷C≧18, where A represents a 10% elongation stress, B represents a tensile strength, and C represents a bending modulus of elasticity.