| 摘要 |
PROBLEM TO BE SOLVED: To improve durability of a link connecting part and to reduce the cost. SOLUTION: A lower link 13 and an upper link constituting a double link piston crank mechanism are rockably connected to each other by a first connecting pin supported in a full-float form. A first bearing part 21 of the lower link 13 is forked to support both end parts of the first connecting pin, and the upper link is interposed between both of them. A bearing hole 22 is formed and penetrated in the first bearing part, and the bearing hole 22 is not provided with the conventional crowning 107 for relaxing edge contact, so that one simple cylindrical surface is formed. This connecting part is rocked so that satisfactory oil film formation is enabled by wedge effect in a space up to the first connecting pin, and omission of the crowning can enlarge an oil film formation area to improve the lubricating state. COPYRIGHT: (C)2007,JPO&INPIT
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