US Patent: 4,261,234
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| Lathe for Machining a Crankshaft
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Patentee:
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| Hermann Berbalk (exact or similar names) - Göppingen, Stuttgart Region, Baden-Württemberg, Germany |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Aug. 17, 1979 |
| Granted: |
Apr. 14, 1981 |
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Joel Havens
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Description: |
| Abstract:
A lathe for simultaneously machining the line bearings of a crankshaft is provided with a turret shaft rotatably mounted on a cross slide for rotation about an axis parallel to the spindle axis. This shaft carries a plurality of turrets each turret being provided with a set of cutting tools on its periphery and being fixed to the turret shaft. Upon withdrawal of the turrets from the workpiece the turret shaft can be indexed to thereby bring the next set of tools into position preparatory to the inward feed of the turret shaft for engagement of the tools with the crankshaft. Two sets of such turrets can be provided on opposite sides of the spindle axis for simultaneous cutting operation on opposite sides of each line bearing of the crankshaft.
Claim:
A lathe comprising a bed, a spindle-stock thereon, a work spindle rotatably mounted in said spindle-stock for rotation about a spindle axis, means for mounting a crankshaft blank on said work spindle for common rotation therewith, at least one cross slide on said bed mounted for movement thereon transversely to said spindle axis, a plurality of coaxial bearings fixed to said cross slide, the common axis of said bearings extending parallel to said spindle axis, a turret shaft rotatably mounted in said bearings, turrets mounted on said turret shaft between said bearings, each turret being fixed to said shaft and being provided with a set of circumferentially distributed mounting means for mounting cutting tools on said turret, an indexing mechanism for step-wise rotation of said turret shaft, the distance of the cutting edges of said tools from said turret shaft exceeding the length of the crank-arms of said crankshaft blank and the distance between said turrets corresponding to the distance between the line bearings of said crankshaft blank. |
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