Abstract: A method of manufacturing an outer joint member of a constant velocity universal includes forming cup and shaft members of medium carbon steel, preparing, as the cup member, a cup member having cylindrical and bottom portions integrally formed by forging, and a joining end surface formed on an outer surface of the bottom portion after the forging, preparing, as the shaft member, a shaft member having a joining end surface to be joined to the bottom portion of the cup member, and bringing the joining end surfaces of the cup and shaft members into abutment against each other. The method also includes welding the cup and shaft members from an outer side of the cup member to an abutment portion between the cup and shaft members in a radial direction of the cup member.

Abstract: For butt-welding, which includes bringing joining end surfaces of a cup member and a shaft member into abutment against each other and radiating a high energy intensity beam from a radially outer side, the shaft member has a recess on a radially inner side of the joining end surface to obtain a welded portion having a closed hollow cavity on a radially inner side after butt-welding. The joining end surface (protruding surface) of the cup member protrudes toward a radially inner side with respect to an inner diameter of the joining end surface of the shaft member. With this, a welded portion of an outer joint member of a constant velocity universal joint, which is manufactured by joining the cup member and the shaft member, can be improved in strength and quality.

Abstract: A power transmission shaft including a male spline formed in an outer periphery thereof, and a diameter increasing portion formed on a part of a tooth bottom of the male spline, which is located on an opposite side to an axial end of the power transmission shaft. The tooth bottom of the male spline has a substantially constant circumferential width extending up to an axial region of the diameter increasing portion. The diameter increasing portion includes a chamfered portion formed in the axial region of the diameter increasing portion, the chamfered portion connecting the tooth bottom and a tooth flank of the male spline to each other to reduce a tooth groove width.

Abstract: The present disclosure provides a method for preventing corrosion capable of sufficiently protecting a surface of an aluminum-based member (in particular, a contact surface with a gasket) from corrosion, particularly when the surface of the aluminum-based member is sealed by the gasket. The method for preventing corrosion of a surface of an aluminum-based member constituting a structure that sandwiches the gasket together with another member in a press contact state, wherein a surfactant is made to adhere to the surface of the aluminum-based member.

Abstract: The present disclosure provides a gasket for corrosion prevention, which can exhibit an excellent corrosion protection performance over a long period of time, without changing rubber characteristics of a rubber elastic body itself. The gasket for corrosion prevention includes a rubber elastic body and a surface active agent, and the surface active agent exists at least in an inner part of the rubber elastic body, in an impregnated state in which the surface active agent can exude to a surface of the rubber elastic body.

Abstract: For butt-welding, which includes bringing joining end surfaces of a cup member and a shaft member into abutment against each other and radiating a high energy intensity beam from a radially outer side, the shaft member has a recess on a radially inner side of the joining end surface to obtain a welded portion having a closed hollow cavity on a radially inner side after butt-welding. The joining end surface (protruding surface) of the cup member protrudes toward a radially inner side with respect to an inner diameter of the joining end surface of the shaft member. With this, a welded portion of an outer joint member of a constant velocity universal joint, which is manufactured by joining the cup member and the shaft member, can be improved in strength and quality.

Abstract: A method of manufacturing an outer joint member of a constant velocity universal includes forming cup and shaft members of medium carbon steel, preparing, as the cup member, a cup member having cylindrical and bottom portions integrally formed by forging, and a joining end surface formed on an outer surface of the bottom portion after the forging, preparing, as the shaft member, a shaft member having a joining end surface to be joined to the bottom portion of the cup member, and bringing the joining end surfaces of the cup and shaft members into abutment against each other. The method also includes welding the cup and shaft members from an outer side of the cup member to an abutment portion between the cup and shaft members in a radial direction of the cup member.

Abstract: A power transmission shaft including a male spline formed in an outer periphery thereof, and a diameter increasing portion formed on a part of a tooth bottom of the male spline, which is located on an opposite side to an axial end of the power transmission shaft. The tooth bottom of the male spline has a substantially constant circumferential width extending up to an axial region of the diameter increasing portion. The diameter increasing portion includes a chamfered portion formed in the axial region of the diameter increasing portion, the chamfered portion connecting the tooth bottom and a tooth flank of the male spline to each other to reduce a tooth groove width.

Abstract: There is provided a sealing structure and a gasket which can seal both of a portion where a groove for mounting the gasket is formed and a portion where a groove for mounting the gasket is not formed when the portions are connected. The gasket includes a first gasket portion 110 which has a first mounted portion 111 to be mounted in a first groove 211 to come in close contact with a bottom face 211a of the first groove 211 and which is formed in a shape along an end portion of an outer wall portion 210 and a second gasket portion 120 which has a second mounted portion 150 to be mounted in a second groove 221 near a portion connected to the first gasket portion 110 and which is formed in a shape along an end portion 220 of a partition wall 220, the second mounted portion 150 having an inclined face for coming in close contact with the inclined bottom face 221a of the second groove 221.

Abstract: A gasket in an integrated double-layered structure comprising an outer layer and an inner layer enclosed by the outer layer, in which the outer layer is a low-hardness rubber layer having a JIS A hardness of 40-70, and the inner layer is a high-hardness rubber layer having a JIS A hardness of 80-100, where a ratio h/h0 of height h of the inner layer to height h0 of the outer layer is preferably 0.3-0.8, and ratio d/d0 of height d of the inner layer to width d0 of the outer layer is preferably 0.5-0.8 in the longitudal cross-section as view from the width direction of the gasket, has a low reaction force, and distinguished sealability and insertibility, and used as inserted between two members, one of which has a groove for insertion.

Abstract: There is provided a sealing structure and a gasket which can seal both of a portion where a groove for mounting the gasket is formed and a portion where a groove for mounting the gasket is not formed when the portions are connected. The gasket includes a first gasket portion 110 which has a first mounted portion 111 to be mounted in a first groove 211 to come in close contact with a bottom face 211a of the first groove 211 and which is formed in a shape along an end portion of an outer wall portion 210 and a second gasket portion 120 which has a second mounted portion 150 to be mounted in a second groove 221 near a portion connected to the first gasket portion 110 and which is formed in a shape along an end portion 220 of a partition wall 220, the second mounted portion 150 having an inclined face for coming in close contact with the inclined bottom face 221a of the second groove 221.

Abstract: A gasket in an integrated double-layered structure comprising an outer layer and an inner layer enclosed by the outer layer, in which the outer layer is a low-hardness rubber layer having a JIS A hardness of 40-70, and the inner layer is a high-hardness rubber layer having a JIS A hardness of 80-100, where a ratio h/h0 of height h of the inner layer to height h0 of the outer layer is preferably 0.3-0.8, and ratio d/d0 of height d of the inner layer to width d0 of the outer layer is preferably 0.5-0.8 in the longitudal cross-section as view from the width direction of the gasket, has a low reaction force, and distinguished sealability and insertibility, and used as inserted between two members, one of which has a groove for insertion.