| 摘要 |
Mechanical shifting device for a toothed-wheel change-speed transmission for motor vehicles for engaging and disengaging positive dog clutches, with shift rails of rectangular cross-section arranged parallel to the transmission shaft and each assigned to one gate in the basic transmission, which shift rails are, for example, arranged as an assembly at an angle of 45 DEG relative to the centre of the transmission shaft and are mounted on the transmission case. The shift rails are provided with recesses into which drivers, of rounded shape at the contact surfaces, of shift rockers and/or shift fingers mounted in the transmission case and, for example, arranged on a shifting shaft engage or are secured by shift rails on the shifting forks. All the shift rails (2, 3, 4), which have the same cross-section, are supported directly and jointly in the transmission case at at least two points and, for interaction with the approximately vertically or horizontally arranged shift fingers (91, 92, 93), can be pivoted through 90 DEG . The common centre of rotation of the shift rail is arranged in such a way that the same shift rockers or shifting forks are in each case actuated by the associated shift rails and that the respective shift rockers and/or shifting forks assigned to the gates remain unaltered as regards position and shape. The shift rails are guided primarily in circular bearing bushes (8, 80) which can be held fixed on the housing, both ... Original abstract incomplete. <IMAGE>
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