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发明授权
CN101530991B 击打工具 有权

击打工具
摘要：
本发明提供一种击打工具，其能够在确保锤砧与金属轴承之间的所需的润滑的同时，实现锤砧的缩短化。在冲击式起子机(1)的锤砧(9)内，沿半径方向形成有连接孔(32)，该连接孔连接主轴(7)的小径部(27)所嵌合的轴承孔(26)和在锤砧(9)的外周面凹陷设置的外槽(33)，但在这里以较深地形成锤砧(9)的外槽(33)的深度(D1)，使之达到锤砧(9)的外径(D)的3％～10％的范围，并将连接孔(32)以在外槽(33)中的锤砧轴向的后端处开口的方式向后方平行移动。
摘要（英）：

The invention provides an impact tool that can implement shorten of an anvil while assuring the smooth needed between the anvil and the metal bearings. A connecting opening (32) is formed in the redius direction in an anvil (9) of impulse type screwdriver, an outer groove (33) formed on an outer periphery of the anvil (9) and opposed to the metal bearing; and a connecting opening (32) radially extending in the anvil (9) and connecting the bearing hole (26) and the outer groove (33) to provide a communication therebetween. The outer groove (33) is formed to have a depth (D1) in the range of 3-10% of an outer diameter (D) of the anvil (9), and the connecting opening (32) opens at a rear end of the outer groove (33) in an axial direction of the anvil.

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