| 摘要 |
A hydraulic torque impulse generator, comprises a motor driven drive member (10) with a fluid chamber (23), an output spindle (11) connectable to a work piece and extending into the fluid chamber (23), two diametrically opposite seal elements (12, 13) movably supported in axial slots (32, 33) in the output spindle (11) for sealing cooperation with seal lands (24, 25) on the fluid chamber wall, axially extending seal ribs (27-30) on both of said fluid chamber wall and said output spindle (11), and a cam spindle (40) drivingly coupled to the drive member (10) and extending into a coaxial bore (34) in the output spindle (11) for engagement with the seal elements (12, 13) and moving the latters outwardly towards the fluid chamber wall in two relative angular positions between the drive member (10) and the output spindle (11). The cam spindle (40) has two diametrically opposite and differently shaped cam means (41, 42) for alternative engagement with high and low lift cam following portions (45-50) on the seal elements (12, 13) such that in one of the relative positions between the drive member (10) the output spindle (11) the seal elements (12, 13) are moved outwardly into sealing engagement with the seal lands (24, 25) and in the other of the relative positions between the drive member (10) and the output spindle (11) the seal elements (12, 13) are moved to positions where no sealing cooperation with the seal lands (24, 25) is obtained, thereby ensuring a single torque impulse only to be generated during each full revolution of the drive member (10) relative the output spindle (11). <IMAGE> |
