Abstract: An objective of the present invention is to quantitatively estimate the residual stress of an object. The present invention provides a method for estimating the residual stress of an object, the method comprising: irradiating an object with terahertz waves; measuring polarization intensity of the terahertz waves transmitted through or reflected by the object; and calculating tensile stress of the object based on the measured polarization intensity. In one embodiment, calculating the tensile stress includes calculating the tensile stress based on a relationship between polarization intensity and tensile stress derived from: a relationship between polarization intensity and tensile distance; and a relationship between tensile distance and tensile stress.

Abstract: An objective of the present invention is to provide a method, or the like, for estimating the convergence of dimensional changes in a molded article over time, by utilizing the polarization intensity of terahertz waves. The present invention provides a method for estimating the convergence of changes in the dimensions of a molded article over time, the method comprising: irradiating a molded article with terahertz waves at multiple positions thereon, wherein the molded article is irradiated with the terahertz waves at each position thereon in multiple orientations about the optical axis; measuring polarization intensities of the terahertz waves transmitted through or reflected from the molded article; and determining whether the polarization intensities at the multiple positions are in a given relationship with each other.

Abstract: An objective of the present invention is to provide a method, or the like, for estimating the convergence of dimensional changes in a molded article over time, by utilizing the polarization intensity of terahertz waves. The present invention provides a method for estimating the convergence of changes in the dimensions of a molded article over time, the method comprising: irradiating a molded article with terahertz waves at multiple positions thereon, wherein the molded article is irradiated with the terahertz waves at each position thereon in multiple orientations about the optical axis; measuring polarization intensities of the terahertz waves transmitted through or reflected from the molded article; and determining whether the polarization intensities at the multiple positions are in a given relationship with each other.

Abstract: This seal structure 1 is provided with an annular seal member 2, a shaft member 4 having a seal groove 5 where the inner peripheral side of said seal member 2 is arranged, and an inner peripheral wall member 6 which has an internal space surrounded by an inner peripheral wall 61, wherein the shaft member 4 is arranged in the internal space 62, and the annular seal member 2 is arranged in the seal groove 5 of the shaft member 4. The side of the outer periphery 21 of the annular seal member 2 is formed by overlapping, in the axial direction D1, a plurality of ring-shape parts 3 which are closed or unclosed when viewed in a radial direction D2; when viewed in the radial direction D2, on one side of a center axis C1 of the annular seal member 2, in a longitudinal cross-section of the plurality of ring-shape parts 3, one corner 32 of the two corners of the edge 31 facing the inner peripheral wall 61 of the inner peripheral wall member 6 contacts the inner peripheral wall 61 of the inner peripheral wall member 6.

Abstract: Provided is a tapered roller bearing (1) subjected to a thrust load and a radial load from a rotation axis (JX). The tapered roller bearing (1) comprises: a plurality of rollers (50) arranged radially between a pair of raceway surfaces (2a, 3a) tilted to one side relative to a plane (P1) perpendicular to the rotation axis (JX); and a retainer (4) disposed between the pair of raceway surfaces (2a, 3a) and having a plurality of pockets (41) for containing the rollers (50). Each of the rollers (50) has: a truncated circular conical roller body (51) having a diameter gradually increasing from the inner side toward the outer side in a radial direction (DD); and a circular conical roller outer section (52) continuous with the outer side of the roller body (51) in the radial direction (DD) and tapered toward the outer side in the radial direction (DD).

Abstract: An annular seal member 2 is formed by overlapping, in the axial direction D1, a plurality of ring-shape parts 3 which are closed or unclosed when viewed in a radial direction D2 orthogonal to the axial direction D1 of the annular seal member 2. A seal groove 5 has a groove bottom 51 with an outer diameter R51 that increases along the axial direction D1. The inner periphery 22 of the annular seal member 2 contacts the groove bottom 51, and the inner diameter R22 of the inner periphery 22 increases as the outer diameter R51 of the groove bottom 51 increases. By this means, the outer diameter R21 of the outer periphery 21 increases, and the side of the outer periphery 21 of the annular seal member 2 that has a smaller outer diameter R21 does not contact the inner peripheral wall 61 of an inner peripheral wall member 6, and the side of the outer periphery 21 of the annular seal member 2 that has a greater outer diameter R21 does contact the inner peripheral wall 61 of the inner peripheral wall member 6.

Abstract: Provided is a tapered roller bearing (1) subjected to a thrust load and a radial load from a rotation axis (JX). The tapered roller bearing (1) comprises: a plurality of rollers (50) arranged radially between a pair of raceway surfaces (2a, 3a) tilted to one side relative to a plane (P1) perpendicular to the rotation axis (JX); and a retainer (4) disposed between the pair of raceway surfaces (2a, 3a) and having a plurality of pockets (41) for containing the rollers (50). Each of the rollers (50) has: a truncated circular conical roller body (51) having a diameter gradually increasing from the inner side toward the outer side in a radial direction (DD); and a circular conical roller outer section (52) continuous with the outer side of the roller body (51) in the radial direction (DD) and tapered toward the outer side in the radial direction (DD).

Abstract: A production method for a ring-shaped part is provided with: an inner cutting step for reciprocating a first cutting blade in the radial direction D4 from a state of contact with the center of the thickness of one end 91a of a rotating cylindrical blank 91 and moving toward the other end 91b in the axial direction D1 to form a semicircular track while cutting the inner circumferential R1-side of the cylindrical blank 91; an outer cutting step before, after or simultaneously with the inner cutting step for reciprocating a second cutting blade in the radial direction D4 from a state of contact with the center of the thickness of the one end 91a of the rotating cylindrical blank 91 and moving toward the other end 91b in the axial direction D1 to form a semicircular track while cutting the outer circumferential R2-side of the cylindrical blank 91; and a separation step after the inner cutting step and the outer cutting step for cutting the portion 92 of the cylindrical blank 91, the inner circumferential R1-side

Abstract: An annular seal member 2 is formed by overlapping, in the axial direction D1, a plurality of ring-shape parts 3 which are closed or unclosed when viewed in a radial direction D2 orthogonal to the axial direction D1 of the annular seal member 2. A seal groove 5 has a groove bottom 51 with an outer diameter R51 that increases along the axial direction D1. The inner periphery 22 of the annular seal member 2 contacts the groove bottom 51, and the inner diameter R22 of the inner periphery 22 increases as the outer diameter R51 of the groove bottom 51 increases. By this means, the outer diameter R21 of the outer periphery 21 increases, and the side of the outer periphery 21 of the annular seal member 2 that has a smaller outer diameter R21 does not contact the inner peripheral wall 61 of an inner peripheral wall member 6, and the side of the outer periphery 21 of the annular seal member 2 that has a greater outer diameter R21 does contact the inner peripheral wall 61 of the inner peripheral wall member 6.

Abstract: This seal structure 1 is provided with an annular seal member 2, a shaft member 4 having a seal groove 5 where the inner peripheral side of said seal member 2 is arranged, and an inner peripheral wall member 6 which has an internal space surrounded by an inner peripheral wall 61, wherein the shaft member 4 is arranged in the internal space 62, and the annular seal member 2 is arranged in the seal groove 5 of the shaft member 4. The side of the outer periphery 21 of the annular seal member 2 is formed by overlapping, in the axial direction D1, a plurality of ring-shape parts 3 which are closed or unclosed when viewed in a radial direction D2; when viewed in the radial direction D2, on one side of a center axis C1 of the annular seal member 2, in a longitudinal cross-section of the plurality of ring-shape parts 3, one corner 32 of the two corners of the edge 31 facing the inner peripheral wall 61 of the inner peripheral wall member 6 contacts the inner peripheral wall 61 of the inner peripheral wall member 6.

Abstract: A production method for a ring-shaped part is provided with: an inner cutting step for reciprocating a first cutting blade in the radial direction D4 from a state of contact with the center of the thickness of one end 91a of a rotating cylindrical blank 91 and moving toward the other end 91b in the axial direction D1 to form a semicircular track while cutting the inner circumferential R1-side of the cylindrical blank 91; an outer cutting step before, after or simultaneously with the inner cutting step for reciprocating a second cutting blade in the radial direction D4 from a state of contact with the center of the thickness of the one end 91a of the rotating cylindrical blank 91 and moving toward the other end 91b in the axial direction D1 to form a semicircular track while cutting the outer circumferential R2-side of the cylindrical blank 91; and a separation step after the inner cutting step and the outer cutting step for cutting the portion 92 of the cylindrical blank 91, the inner circumferential R1-side

Abstract: A radial roller bearing can include an outer race having as a center axis a first axis extending in a first direction and an inner race having as the center axis the first axis. A group of rollers composed of a plurality of rollers arranged at intervals in the circumferential direction can be centered on the first axis between the outer raceway surface of the outer race and the inner raceway surface of the inner race and a cage can be provided for holding the group of rollers. A first regulating part can be provided for regulating the movement of the outer race to one side. A second regulating part can be provided for regulating the movement of the outer race to another side. The first regulating part and the second regulating part can be arranged at positions at which the distance between the first regulating part and the second regulating part is a prescribed distance longer than the outer race.

Abstract: The present invention has an outer race having as a center axis a first axis extending in a first direction; an inner race having as the center axis the first axis; a group of rollers composed of a plurality of rollers arranged at intervals in the circumferential direction centered on the first axis between the outer raceway surface of the outer race and the inner raceway surface of the inner race; a cage for holding the group of rollers; a first regulating part for regulating the movement of the outer race to one side; and a second regulating part for regulating the movement of the outer race to another side. The first regulating part and the second regulating part are arranged at positions at which the distance between the first regulating part and the second regulating part is a prescribed distance longer than the outer race.

Abstract: The present invention pertains to a motor 1 or a power generator provided with: a stator 2; a rotor 3 that rotates about a rotation shaft 313 so as to be apart from the stator 2 by a space K; and a buffering member 5 located in the space K.