| 摘要 |
<p>An air motor 24 to be employed in a mine drilling apparatus, the motor includes a hollow body 26 formed of plastics material, a driven shaft 39 rotatably supported by the body 26, and incorporating a valve assembly 34, the body 26 having opposing pairs of external faces 58 within which there are mounted metal cylinder sleeves 29 which receive pistons 30, a cylinder head 31 of plastics material closing each cylinder 29, and a piston rod 32 coupling opposing pairs of pistons 30 and engaging the shaft 29 so that power is transmitted thereto.</p> |
