Propeller shaft and yoke structure of universal joint used for the propeller shaft

摘要

A propeller shaft has a first yoke having a fixing portion, a pair of first bifurcated yoke portions extending from one end portion of the fixing portion in an axial direction, and a first bearing hole formed at each first yoke portion and securing therein a first bearing that holds a cruciform shaft; a second yoke coupled to the first yoke through the cruciform shaft and secured to a predetermined member, and having a mounting flange, and a bolt insertion hole which is formed at the mounting flange and into which a bolt to secure the second yoke to the predetermined member is inserted; and a securing member securing the mounting flange of the second yoke to the predetermined member through the bolt by a fastening tool. Each first yoke portion is provided with a first concave portion that slides thereon an outer circumferential surface of the fastening tool.

主权项

1. A propeller shaft comprising:
a shaft part; a first yoke having
(a) a fixing portion fixed to the shaft part;(b) a pair of first yoke portions having a bifurcated shape that extends from one end portion of the fixing portion in an axial direction, and each of the first yoke portions having a first concave portion that is shaped to accommodate thereon an outer circumferential surface of a fastening tool; and(c) a first bearing hole formed at a top end portion of each first yoke portion and securing therein a first bearing that holds a cruciform shaft; and a second yoke coupled to the first yoke through the cruciform shaft and secured to a predetermined member, the second yoke having
(d) a mounting flange provided, at a predetermined pitch distance, with four bolt insertion holes, each of which a bolt to secure the second yoke to the predetermined member is inserted to; and(e) a pair of second yoke portions having a bifurcated shape that extends from the mounting flange toward the first yoke in the axial direction, each of the second yoke portions having, at both side surfaces thereof, a second concave portion that is shaped into an arc-shaped groove in cross section and that extends in a longitudinal direction of each of the second yoke portions.