| 摘要 |
PROBLEM TO BE SOLVED: To provide a hydraulic driving reduction gear that has radially and axially miniaturized components and high durability, by optimizing a support structure of especially the final stage planetary gear of a planetary gear mechanism built in the reduction gear. SOLUTION: A trunnion boss 25 is projectively and integrally provided at one end side of a fixing casing 11, a strut 27 is projected from a holder 24 for supporting the tip of the trunnion boss 25 toward the fixing casing 11, and the strut 27 is butted on a strut 28 projecting from the fixing casing 11 side and fastened by a bolt 30.
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