Title:
PISTON PIN AND METHOD FOR MANUFACTURING PISTON PIN
Document Type and Number:
WIPO Patent Application WO/2017/154375
Kind Code:
A1
Abstract:
A pin main body 10 is provided with a thinning hole 11 having: one-end-side and other-end-side large-diameter parts 11b, 11c provided to both longitudinal end sides of the piston main body; a central small-diameter part comprising a small-diameter part 11a and one-end-side and other-end-side medium-diameter parts 11d, 11e provided between the large-diameter parts; one-end-side and other-end-side first rounded parts 11f, 11h that are provided between the large-diameter parts and the central small-diameter part, the first rounded parts decreasing in inside diameter from the large-diameter-part sides toward the central-small-diameter-part sides, and the rate of change in inside diameter increasing from the large-diameter-part sides toward the central-small-diameter-part sides; and one-end-side and other-end-side second rounded parts 11g, 11i that are provided between the first rounded parts and the central small-diameter part, the second rounded parts decreasing in inside diameter from the first-rounded-part sides toward the central-small-diameter-part sides, and the rate of change in inside diameter decreasing from the first-rounded-part sides toward the central-small-diameter-part sides.
Inventors:
HIGASA YUTO (JP)
KOIZUMI SHIN (JP)
ZENKE MINORU (JP)
IDE TAKASHI (JP)
KOIZUMI SHIN (JP)
ZENKE MINORU (JP)
IDE TAKASHI (JP)
Application Number:
PCT/JP2017/001906
Publication Date:
September 14, 2017
Filing Date:
January 20, 2017
Export Citation:
Assignee:
HITACHI AUTOMOTIVE SYSTEMS LTD (JP)
International Classes:
F16J1/16; B21J5/06; B21K1/18
Foreign References:
| JP2001182830A | 2001-07-06 | |||
| US5027996A | 1991-07-02 | |||
| JP2001324017A | 2001-11-22 |
Attorney, Agent or Firm:
KOBAYASHI, Hiromichi et al. (JP)
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