Apparatus for producing variable ratio gearing |
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| 申请号 | US3732780D | 申请日 | 1970-10-01 | 公开(公告)号 | US3732780A | 公开(公告)日 | 1973-05-15 |
| 申请人 | MAAG ZAHNRAEDER & MASCHINEN AG; | 发明人 | WYDLER R; RUESCH E; | ||||
| 摘要 | A variable ratio gear component, such as a motor vehicle steering segment, is produced by arranging that relative motion between a workpiece forming the component and a tool includes a normal generating component and a graduated additional generating component, the latter being imparted to the workpiece tangentially to the generating path of the tool and workpiece. An adaptation of a gear cutting machine is described to provide for the inclusion of such an additional motion derived from the rotation of the workpiece relative to the table. | ||||||
| 权利要求 | 1. In a gear cutting machine having a table for carrying a workpiece and tool mounting means, means producing relative generating motion between a tool on said mounting means and said workpiece that is modified from normal generating motion in order to generate on said workpiece a plurality of teeth, adapted for a varying ratio gear tooth system comprising, in combination, a carrier on which the workpiece table is rotatably mounted for rotational displacement of the workpiece, slide means on which the carrier is mounted for linear displacement of the table and workpiece, drive means for said rotational and linear displacements to produce a normal generating motion between the tool and the workpiece, cam means secured relative to the table for rotation therewith, follower assembly means engaging said cam means and connected to said carrier to provide a supplementary relative linear displacement between the table and the tool in accordance with the profile of the cam means such as to produce an additional generating motion between the tool and the workpiece modifying the normal generating motion whereby to produce a generating curve adapted for said varying ratio system. 2. A gear cutting machine according to claim 1 wherein said drive means compromises a drive input, a spindle connected to said input to be rotated thereby, a nut element engaging said spindle to be displaceable therealong upon rotation of the spindle, said nut element being connected to the carrier whereby operation of the drive input produces linear displacement of the workpiece for said normal generating motion, means permitting relative displacement between the tool and the workpiece in said linear motion direction of the nut element relative to the carrier, said cam means being arranged to control said relative displacement and thus to impart said additional generating motion to the workpiece. 3. A gear cutting machine according to claim 2 wherein said follower assembly means comprises a lever having a pivot axis on the carrier and an adjustment element connected to said lever at a position eccentric to said pivot axis on the carrier, a receiving recess in said nut element directed transversely to said linear displacement direction, said adjustment element being engaged by said recess whereby displacement of the adjustment element by pivoting of the lever produces linear movement of the carrier relative to said nut element in the direction of linear displacement. 4. A gear cutting machine according to claim 2 wherein bias means apply a force to the carrier against the direction of carrier movement to provide a resistance of substantially constant force acting against the displacement of the carrier as the workpiece is being cut. 5. A gear cutting machine according to claim 4 wherein said bias means comprise a piston and cylinder unit, a base or sub-frame portion of the machine providing a support for the reaction force developed by said unit. |
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