| US 7,540,808 B2 | ||
| Power transmission shaft, power transmission device incorporating the same and method of forming the same | ||
| Hiroyuki Iwashita, Chita-gun (Japan); Tadashi Naganawa, Chiryu (Japan); and Isashi Kashiwagi, Kariya (Japan) | ||
| Assigned to JTEKT Corporation, Osaka-shi (Japan) | ||
| Filed on Mar. 21, 2006, as Appl. No. 11/384,526. | ||
| Claims priority of application No. 2005-093286 (JP), filed on Mar. 28, 2005. | ||
| Prior Publication US 2006/0217209 A1, Sep. 28, 2006 | ||
| Int. Cl. F16D 3/84 (2006.01) | ||
| U.S. Cl. 464—175 | 9 Claims |
| 1. A power transmission shaft comprising:
a power transmission shaft member; and
a swaged boot-engaging groove on an outer circumference of the power transmission shaft member,
wherein a depth of the boot-engaging groove is set in the range 0.3 to 0.55 mm and an angle of inclination of an edge portion
of the swaged boot-engaging groove with respect to the outer circumference of the power transmission shaft member is set in
the range of 20 to 35 degrees, whereby the swaged boot-engaging groove does not exhibit underfill or rollover.
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