Title:
CRANK SHAFT
Document Type and Number:
Japanese Patent JP2016098862
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a crank shaft capable of reducing a weight while suppressing degradation of rigidity.SOLUTION: A shoulder portion of an arm of a crank shaft is provided with a recessed hole. When a direction connecting a center of a journal and a center of a pin is a vertical direction, and a direction orthogonal to the vertical direction is a lateral direction when viewed from the axial direction of the journal, the cross-sectional shape in the direction orthogonal to a depth direction of the hole is provided with a first bottom side in which a length in the lateral direction of the cross-sectional shape becomes longest, and a second bottom side disposed in an upper direction or a lower direction of the first bottom side through the center of gravity of the cross-sectional shape, and laterally connecting a pair of inflection points separating most from the first bottom side. A relationship of α/β≥1 is established when one of the first bottom side and the second bottom side is an upper side, the other is a lower side positioned at a lower direction of the upper side, a length of the upper side is α, and a length of the lower side is β.SELECTED DRAWING: Figure 3
Inventors:
KAGEYAMA KENTA
IIZUKA MITSUHISA
OWAKI SUSUMU
IIZUKA MITSUHISA
OWAKI SUSUMU
Application Number:
JP2014234023A
Publication Date:
May 30, 2016
Filing Date:
November 18, 2014
Export Citation:
Assignee:
AICHI STEEL WORKS LTD
International Classes:
F16C3/08; F16C3/14
Domestic Patent References:
| JP2010230027A | 2010-10-14 | |||
| JP2010230036A | 2010-10-14 | |||
| JPH03130911U | 1991-12-27 | |||
| JPH024017U | 1990-01-11 | |||
| JPS582417U | 1983-01-08 | |||
| JP2005114131A | 2005-04-28 | |||
| JP2009133331A | 2009-06-18 | |||
| JPH01145910U | 1989-10-06 |
Attorney, Agent or Firm:
Tomoaki Higashiguchi
Shindo Motoko
Kudo snow
Shindo Motoko
Kudo snow