| 摘要 |
715,086. Securing parts to shafts. ROLLSROYCE, Ltd. Feb. 6 1953 [Feb. 13, 19521. No. 3890/52. Class 80 (2) [Also in Groups XXII, XXV, XXVI and XXXIV] A structure including parts 10, 11, Fig. 1, secured together by a separable joint, comprises a plurality of securing .elements 12 such as bolts, dowels &c. interconnecting the parts, each of the securing elements having an axial portion of which the cross-section 12a is substantially oval and engages in a circular aperture in at least one of the parts, the apertures which receive the oval portions having a diameter to fit the major axis of the said oval portions and the securing elements being located with respect to the parts so that the oval portions have their minor axes meeting substantially at a point, or on an axis, about which relative radial expansion of the parts tends to take place. The device is intended to provide a separable joint between parts which in use tend to expand or contract differentially about a focal point or axis, e.g. in gas turbine engines where two parts of differing material are interconnected and are subjected internally or externally.to a heated gas, so that owing to the different coefficients of thermal expansion of the materials, differential expansion tends to take place between the parts. As applied to securing a rotating labyrinth seal 90, Fig. 13, to a flange 91 on the end of a shaft 92 of a turbine rotor 93, bolts 94 are passed through circumferentially spaced holes in the members and have portions 95 of oval crosssection with their. minor axes extending through the axis of rotation of the rotating parts. The bolts 94 are formed with flats 94a co-operating with a flange extension on the flange 91. |
