| 摘要 |
Single-motored, compact, multipurpose instrument for accurate reaming. The instrument is composed of a boring bar which is held in its position by two balancing supports. The first support contains both the driving head of the boring bar and the device for the differential movement of the tool. The second support has the function of positioning the bar. The instrument can be applied for the on site activity of reaming couplings for shafts and flywheels in thermal powerplants, oil refineries, shipyards, paper mills, chemical factories and steel mills. The tool carrier slides through the inside of a slot which is machined on the boring bar. The movement of the tool carrier is continuous and composed of two gears (Fig. 1 (A) and (B)) having the same pitch diameter as each other, but having a number of teeth which differs by one unit. Both (Fig. 1 (A)) and (Fig. 1 (B)) mesh with another gear which, by rolling around the gear (Fig. 1 (A)), makes the gear (Fig. 1 (B)) rotate with the same number of rotations minus one tooth. The differential motion is transferred on to the nut screw which is made to rotate of a certain angle, so the tool carrier makes a linear movement. The same idea works if one uses the spindle of another tooling machine as a motorization.
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