| 摘要 |
PROBLEM TO BE SOLVED: To prevent the generation of seizing caused by the shortage of the lubrication of a bearing with a simple structure by mounting a grease reservoir chamber opened to a bearing slide surface, inside a connecting rod. SOLUTION: When a motor 16 is driven by an electric signal from the external, its rotation driving force is transmitted to a connecting rod 9 through a drive gear 17, a driven gear 18, a crank shaft 20, a balance weight 23 and a crank pin 24, and the piston 10 is vertically reciprocated. On this occasion, an opening 9a as a grease reservoir chamber is formed inside the connecting rod 9, and a proper amount of grease is injected inside of the opening 9a. This opening 9a is opened to a crank side bearing slide surface 9b of the connecting rod 9, and the grease injected from the opening part 9aa flows toward the crank side bearing slide surface 9b. Whereby the durability of a bearing part can be improved without mounting a bearing member such as a bearing, a bush or the like on the bearing slide surface 9b.
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