| 摘要 |
<p>The invention relates to a threaded joint for rock-drilling equipment of the type that includes female and male parts that are interconnected via threaded joints. The invention is particularly advantageous in connection with female parts (1) of the type that includes an internal trapezoidal thread in the form of a helix thread ridge, which is delimited by a top and two flanks (12a, 12b), a groove (13), having a bottom (14), running between two tops, and which thread ridge extends a plurality of turns between a front end and a rear end, the thread top touching an imaginary cylinder or cone that is concentric with a centre axis of the female part. According to the invention, the bottom (14) of the thread groove has a concave and partially circular cross-section shape along at least a part of the extension of the groove, and transforms into flanks via concave radius transitions (22), the radii (r2) of which decrease in the direction from the front end of the thread toward the rear one, at the same time as the radius (r1) of the groove bottom (14) increases in the same direction.</p> |
