Abstract: A driving shaft includes yokes at both its ends and an intermediate slidable portion composed of a male shaft member and a female shaft member fitted with each other by means of splines. The male shaft member includes a hollow shaft member having an inner diameter larger than the outer diameter of one end of the female shaft member on the side of the male shaft member, and a splined male member having a splined slidable portion to be fitted in the splined hole of the female shaft member and a fixing portion fitted in the hollow shaft member. An elastic body interposed between the inner surface of the hollow shaft member and the outer surface of the fixing portion to fix the splined male member to the hollow shaft member. In producing such a driving shaft, before fitting the splined male member in the hollow shaft member, a resin coating is applied to either the inner surface of the hollow shaft member or the fixing portion of the splined male member.

Abstract: A driving shaft includes yokes at both its ends and an intermediate slidable portion composed of a male shaft member and a female shaft member fitted with each other by means of splines. The male shaft member includes a hollow shaft member having an inner diameter larger than the outer diameter of one end of the female shaft member on the side of the male shaft member, and a splined male member having a splined slidable portion to be fitted in the splined hole of the female shaft member and a fixing portion fitted in the hollow shaft member. An elastic body interposed between the inner surface of the hollow shaft member and the outer surface of the fixing portion to fix the splined male member to the hollow shaft member. In producing such a driving shaft, before fitting the splined male member in the hollow shaft member, a resin coating is applied to either the inner surface of the hollow shaft member or the fixing portion of the splined male member.

Abstract: A driving shaft includes yokes at both its ends and an intermediate slidable portion composed of a male shaft member and a female shaft member fitted with each other by means of splines. The male shaft member includes a hollow shaft member having an inner diameter larger than the outer diameter of one end of the female shaft member on the side of the male shaft member, and a splined male member having a splined slidable portion to be fitted in the splined hole of the female shaft member and a fixing portion fitted in the hollow shaft member. An elastic body interposed between the inner surface of the hollow shaft member and the outer surface of the fixing portion to fix the splined male member to the hollow shaft member. In producing such a driving shaft, before fitting the splined male member in the hollow shaft member, a resin coating is applied to either the inner surface of the hollow shaft member or the fixing portion of the splined male member.

Abstract: A propeller shaft includes male and female shafts, each having at one end a yoke and at the other end a spline sliding portion. At least one of these shafts is wholly made of a hollow tube and its one end is worked to form an integral yoke and the other end is plastically worked with a die to form an integral spline sliding portion. A separate yoke may be welded to the hollow tube. The spline sliding portion thus formed has spline teeth of an integer number within the range of numerals obtained by multiplying the numeral indicating a larger spline diameter in mm by 0.12 to 0.25. The spline teeth has a spline tooth root angle within the range of 90 to 120 degrees enclosed between side faces of adjacent spline teeth. The propeller shaft reduces man-hour for producing it to improve the production efficiency and hence reduce its cost.

Abstract: A propeller shaft includes male and female shafts, each having at one end a yoke and at the other end a spline sliding portion. At least one of these shafts is wholly made of a hollow tube and its one end is worked to form an integral yoke and the other end is plastically worked with a die to form an integral spline sliding portion. A separate yoke may be welded to the hollow tube. The spline sliding portion thus formed has spline teeth of an integer number within the range of numerals obtained by multiplying the numeral indicating a larger spline diameter in mm by 0.12 to 0.25. The spline teeth has a spline tooth root angle within the range of 90 to 120 degrees enclosed between side faces of adjacent spline teeth. The propeller shaft reduces man-hour for producing it to improve the production efficiency and hence reduce its cost.

Abstract: A driving shaft having splined male and female shafts. The spline tooth pattern of the male shaft seen in a cross-section comprises an inclined portion substantially similar to those of a symmetrical spline tooth pattern of a conventional male shaft, and an outwardly convex and gently curved portion starting from the outer end of the inclined portion and terminating in a smaller diameter portion at the bottom of the tooth pattern. The radius of the smaller diameter portion and the tooth width at the bottom of the tooth pattern are larger than those in the symmetrical spline tooth pattern of the conventional male shaft, thereby obtaining an improved driving shaft to transmit greater rotating torque. The spline sliding portion of the female shaft is formed from a hollow tube by press-forming in a manner that the outer diameter of the press-formed portion is larger than that of a hollow blank tube, thereby increasing the torque transmission diameter to reduce surface pressure resulting in prolonged service life.