Abstract: A propeller shaft (PS) has a balance piece (9) on the outer peripheral side of a stub shaft body section (31) of a stub shaft (3), which is axially separated from both spline sections (25, 34), which are spline fitting sections. Due to this configuration, changes in the gap in both spline sections (25, 34) when the balance piece (9) is welded are minimized, and the occurrence of new rotational imbalance can be minimized. As a result, rotational imbalance in the propeller shaft (PS) due to the balance piece (9) can be corrected appropriately and easily.

Abstract: A propeller shaft (PS) has a balance piece (9) on the outer peripheral side of a stub shaft body section (31) of a stub shaft (3), which is axially separated from both spline sections (25, 34), which are spline fitting sections. Due to this configuration, changes in the gap in both spline sections (25, 34) when the balance piece (9) is welded are minimized, and the occurrence of new rotational imbalance can be minimized. As a result, rotational imbalance in the propeller shaft (PS) due to the balance piece (9) can be corrected appropriately and easily.

Abstract: A universal joint includes: a yoke; cups; a cross shaft; a plurality of needles; washers each including; a washer main body portion which has a circular plate shape, and which is disposed between one of the cup bottom portions, and one of the shaft portions, a needle side raised portion which has an annular shape, which is integrally formed on an outer circumference side of one of the washer main body portion, and which protrudes toward the needle side, and a cup bottom portion side raised portion which has an annular shape, which is integrally formed on the outer circumference side of the one of the washer main body portions, and which protrudes toward the cup bottom portion side.

Abstract: A low surface-roughness part is formed at a first tapered part, and, as a result, the roughness of an opening-edge of a groove part of an internal spline part that opens at the first tapered part is reduced, and surface pressure applied by the opening edge to a tooth of an external spline part can be reduced. As a result, the opening edge of the groove part of the internal spline part can be kept from digging into the tooth, and variation, between products, in the insertion load of a second shaft part can be suppressed.

Abstract: In a coupling structure for a propeller shaft and a propeller shaft, a propeller shaft-side adapter includes: a flange portion of the propeller shaft-side adapter extending in a radial direction relative to a rotation axis of a rotation shaft, and connected to a flange portion of a vehicle-side adapter; a center pin accommodating portion formed on the rotation axis, and into which a center pin provided to the vehicle-side adapter is inserted; and an inner peripheral portion formed between the flange portion of the propeller shaft-side adapter and the center pin accommodating portion in the radial direction relative to the rotation axis, which is opposed to the vehicle-side adapter in a direction of the rotation axis, and in which a distance from the rotation axis in the radial direction relative thereto decreases extending away from the flange portion of the vehicle-side adapter in the rotation axis direction.

Abstract: A propeller shaft (1) that is a power transmission shaft has a shaft member (2) as a tubular body made of iron-based metal and a balance weight (3) made of iron-based metal and welded to an outer peripheral surface of this shaft member (2). At least a part of the balance weight (3) of the propeller shaft (1) is covered with a sacrificial metal coating (4) made of sacrificial corrosion prevention material that contains metal whose ionization tendency is higher than that of metal forming the shaft member (2). With this, it is possible to suppress local progression of corrosion at a periphery of the balance weight (3) and improve durability of the propeller shaft (1) .

Abstract: A power transmission shaft includes: a bearing including a cylindrical portion, an internal spline portion, and an internal spline side annular groove including a bottom surface, and a first side wall and a second side wall, the first side wall which includes a first inclination surface inclined with respect to the rotation axis of the shaft portion, and on which the circlip is abutted in a state where a radius of the circlip is decreased within the internal spline side annular groove, and the second side wall on which the circlip is abutted in the state where the radius of the circlip is decreased within the internal spline side annular groove.

Abstract: A propeller shaft (1) that is a power transmission shaft has a shaft member (2) as a tubular body made of iron-based metal and a balance weight (3) made of iron-based metal and welded to an outer peripheral surface of this shaft member (2). At least a part of the balance weight (3) of the propeller shaft (1) is covered with a sacrificial metal coating (4) made of sacrificial corrosion prevention material that contains metal whose ionization tendency is higher than that of metal forming the shaft member (2). With this, it is possible to suppress local progression of corrosion at a periphery of the balance weight (3) and improve durability of the propeller shaft (1).

Abstract: A propeller shaft as a power transmission shaft is provided between vehicle-side first second shaft parts, and a first tube as a first shaft member is connected to the first shaft part through a first joint member and to the second shaft part through a second joint member. The first tube is connected to the first joint member through a first collar member and to the second joint member through a second collar member. The first collar member includes a first main body part exposed from a first end portion of the first tube, and a first insertion part inserted into the inside of the first end portion. In at least the first collar member, the maximum value of the outer diameter of the first main body part is set to be no greater than the maximum value of the outer diameter of the first insertion part.

Abstract: A propeller shaft includes: a cylindrical boot member including a protruding portion, and a boot band tightening portion; a shaft member which is inserted into the boot member, and which includes a first diameter portion having an outside diameter greater than an inside diameter of the protruding portion, a groove portion which has an outside diameter smaller than the outside diameter of the first outside diameter portion, and in which the protruding portion is received, and a second outside diameter portion having an outside diameter greater than the outside diameter of the first outside diameter portion; and a boot band tightened on the boot band tightening portion.

Abstract: A propeller shaft includes an outer ring member having a bottom section through which a vent hole is formed, on a first end part connected to a shaft member. The propeller shaft further includes an inner ring member provided to the inner peripheral side of a second end part of the outer ring member on the side axially opposite to the first end part and connected to a rod member; a ball member between the inner and outer ring members, which is lubricated by grease; a plate member attached to the inner peripheral part of the outer ring member and forming an auxiliary chamber with the bottom section; and a communication path. The communication path allows communication between the first end part side and the second end part side of the outer ring member with the plate member interposed therebetween.

Abstract: According to the present invention, a low surface-roughness part (114a) is formed at a first tapered part (114), and, as a result, the roughness of an opening-edge of a groove part (113a) of an internal spline part (113) that opens at the first tapered part (114) is reduced, and surface pressure applied by the opening edge to a tooth (123b) of an external spline part (123) can be reduced. As a result, the opening edge of the groove part (113a) of the internal spline part (113) can be kept from digging into the tooth (123b), and variation, between products, in the insertion load of a second shaft part (12) can be suppressed.

Abstract: A low surface-roughness part is formed at a first tapered part, as a result, the roughness of an opening-edge of a groove part of an internal spline part that opens at the first tapered part is reduced, and surface pressure applied by the opening edge to a tooth of an external spline part can be reduced. As a result, the opening edge of the groove part of the internal spline part can be kept from digging into the tooth, and variation, between products, in the insertion load of a second shaft part can be suppressed.

Abstract: A propeller shaft includes constant-velocity joints at both the end portions of a first shaft member.

Abstract: A propeller shaft includes a rotational shaft and a constant-velocity joint. The constant-velocity joint includes an inner race member connected to the rotational shaft, a rolling member disposed on an outer periphery of the inner race member in a radial direction relative to a direction of a rotational axis of the rotational shaft, and a tubular outer race member provided on an outer periphery of the rolling member in the radial direction and configured so that a rotational force of the rotational shaft is transmitted thereto via the rolling member. The outer race member has first and second end portions of the outer race member in the direction of the rotational axis. The outer race member includes a centering portion provided at the first end portion and formed so as to be smaller than a maximum diameter of the outer race member in the radial direction.

Abstract: In a propeller shaft, a crowning portion of a male spline portion is provided in a predetermined range including a front end portion in an axial direction, and a tooth tip surface is shaped in such a manner that a tooth thickness thereof gradually increases from the front end portion toward an intermediate portion of the male spline portion in the axial direction.

Abstract: A propeller shaft (1), as a power transmitting shaft, of the present invention is configured such that a snap ring (8) as a retaining ring can be inserted inwards into a first penetration slot (31) formed at a tubular portion body (33) of a tubular portion (30) from a radial direction outer side. With this, good workability of assembly of the snap ring (8) is secured. Further, an engagement-stop state of a second shaft (3) by the snap ring (8) can be visually checked from the outside through the first penetration slot (31), then check of an engagement state by the snap ring (8) can be made.

Abstract: A propeller shaft as a power transmission shaft includes a CFRP tube formed in a cylindrical shape as a shaft member, wherein a helical layer portion mainly bearing torsional strength and bending strength is made of carbon fiber of first carbon fiber material having a relatively high tensile strength (or a tensile elasticity), and wherein a hoop layer portion that is disposed at least one of inside and outside of the helical layer portion in a radial direction with respect to a rotational axis thereof and that does not bear torsional strength or bending strength is made of carbon fiber of second carbon fiber material having a tensile strength (or a tensile elasticity) lower than that of the first carbon fiber material.

Abstract: A propeller shaft as a power transmission shaft is provided between vehicle-side first second shaft parts, and a first tube as a first shaft member is connected to the first shaft part through a first joint member and to the second shaft part through a second joint member. The first tube is connected to the first joint member through a first collar member and to the second joint member through a second collar member. The first collar member includes a first main body part exposed from a first end portion of the first tube, and a first insertion part inserted into the inside of the first end portion. In at least the first collar member, the maximum value of the outer diameter of the first main body part is set to be no greater than the maximum value of the outer diameter of the first insertion part.

Abstract: A power transmission shaft includes: a bearing including a cylindrical portion, an internal spline portion, and an internal spline side annular groove including a bottom surface, and a first side wall and a second side wall, the first side wall which includes a first inclination surface inclined with respect to the rotation axis of the shaft portion, and on which the circlip is abutted in a state where a radius of the circlip is decreased within the internal spline side annular groove, and the second side wall on which the circlip is abutted in the state where the radius of the circlip is decreased within the internal spline side annular groove.