| 摘要 |
PURPOSE:To reduce the dividing places of the upper cover and improve the mechanical strength thereof by a method wherein the upper cover is formed into two-pieces and the configuration of a large diametral opening for the inserting hole of the upper cover is made so as to have a dimension of the outer diameter of the upper cover plus the working room therefor. CONSTITUTION:In case the upper cover 1 is hang to mount, the upper cover can be hang with the working room g1 formed between the inner peripheral surface of the inside diameter DV1 of the upper end opening of a barrel 3 and the working room h3 is formed between the opposing surfaces f1, f2 of the opening 8 side and the end faces F1, F2 of the connecting side. The working rooms g1, g2 are formed between a main shaft flange 6 and the upper cover 1 and between the upper cover 1 and the opening of the upper end of the barrel respectively. According to this method, the cover may be hang and lowered smoothly and safely. The upper cover is divided into two pieces, therefore, the other upper cover 1 may be mounted by turning it by 180 deg. in the barrel 3 to mount it. |
