| 摘要 |
A steering -joint device (13) arranged between a string section (11) and a drilling section (12) in a rock-drilling machine (1), the steering joint (13) including a universal- joint cross (131) supported in the string section (11) and the drilling section (12), pivotal around a first and a second pivot axis (1311, 1312), and the universal-joint cross (131) being provided with a first control arm (1313) supported in the string section (11) and a second control arm (1314) supported in the drilling section (12), wherein an end portion (1313a, 1314a) of each of the control arms (1313, 1314) is pivotally arranged in, respectively, a first and a second control-arm bearing (112, 122) in a slanted centre cut-out (115, 125) in an axially displaceable steering sleeve (114, 124), the steering sleeve (114) of the string section (11) having an axial direction which is perpendicular to the pivot axis (1311) of the universal-joint cross (131) through the string section (11) and is slanted relative to the pivot axis (1312) of the universal- joint cross (131) through the drilling section (12), and the steering sleeve (124) of the drilling section (12) having an axial direction which is perpendicular to the pivot axis (1312) of the universal-joint cross (131) through the drilling section (12) and is slanted relative to the pivot axis (1311) of the universal-joint cross (131) through the string section (11). |
