Abstract: As a stopper for restricting movement of a rotary shaft 31 of a transmission device 3 and a shaft part 41 of a first drive-side joint member J11 in a direction of approaching each other, a stopper part 5 is formed separately from the shaft part 41 and a yoke body part 42 of the first drive-side joint member so that the stopper function of the first drive-side joint member J11 is guaranteed by the separately-formed stopper part 5 in the present invention. With this configuration, a change in the gravity center position of the first drive-side joint member caused due to build-up processing on the shaft part or the yoke body part is suppressed. It is possible to restrict relative movement of the first drive-side joint member and the rotary shaft while ensuring adequate machining for formation of a shaft-part-side seal surface on the first drive-side joint member.

Abstract: A water-impermeable cover includes an opening part extending toward an opening part of a holding ring of a stub shaft of a propeller shaft, and is disposed to face the opening part of the holding ring. The water-impermeable cover is fixed at a position to face the opening part of the holding ring of the stub shaft, and the opening part of the water-impermeable cover extends to approach the opening part of the holding ring: therefore, even if muddy water etc. scatters obliquely toward the opening part of the holding ring, the risk of muddy water etc. entering the opening part of the holding ring is reduced, and as a result, also the risk of muddy water etc. entering an interior of a center bearing is reduced.

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 includes a shaft section connected between an input shaft and an output shaft via respective constant velocity joints, wherein the input shaft is connected to a drive source of a vehicle, and the output shaft is connected to driving wheels. The constant velocity joint includes a circlip-restricting surface to engage with a circlip provided in an outer peripheral surface of the input or output shaft, for restricting movement of the first or second shaft in an axial direction. The circlip-restricting surface is implemented by a first inclined surface and a second inclined surface, wherein the second inclined surface is closer to a rotational axis of the shaft section, and wherein the first inclined surface has an acute angle with respect to the axial direction, and the second inclined surface has a smaller angle with respect to the axial direction.

Abstract: A power transmission device includes: a coupling member including an insertion hole, and having an axial elastic force; a connection member which includes a connection hole, and which is connected to the coupling member by a bolt inserted through the connection hole and the insertion hole; a sleeve member which is disposed within the connection hole and the insertion hole, and within which the bolt is inserted; and a ring member disposed within the connection hole, including an outer circumference surface abutted on an inner circumference surface of the connection hole, and including a through hole through which the sleeve member is inserted to penetrate.

Abstract: A propeller shaft includes a shaft section connected between an input shaft and an output shaft via respective constant velocity joints, wherein the input shaft is connected to a drive source of a vehicle, and the output shaft is connected to driving wheels. The constant velocity joint includes a circlip-restricting surface to engage with a circlip provided in an outer peripheral surface of the input or output shaft, for restricting movement of the first or second shaft in an axial direction. The circlip-restricting surface is implemented by a first inclined surface and a second inclined surface, wherein the second inclined surface is closer to a rotational axis of the shaft section, and wherein the first inclined surface has an acute angle with respect to the axial direction, and the second inclined surface has a smaller angle with respect to the axial direction.