Process for grinding crankpins of a crankshaft and grinder for this purpose
AssigneeNaxos-Union Schleifmittel-Und Schleifmaschinenfabrik
InventorDieter Lehmann
Life of this patent
Estimating the term…
Abstract
A process for successive grinding of crankpins of crankshaft by a grinder includes clamping the crankshaft at two spaced center journals thereof and rotating the crankshaft around the axis of a crankpin to be ground. To enable the maintenance of highly acurate production tolerances even for small quantities and large crankshafts in an economical manner, only crankpins directly adjacent to the center journals that are clamped are ground. Different clamping positions of the crankshaft are offset axially from one another by the center-to-center distance between two adjacent crankpins of the center journals or a multiple thereof.
Claims29
In a process for successive grinding of crankpins of a crankshaft having a plurality of spaced crankpins and main bearing journals, wherein said crankshaft is clamped and rotated about an axis of each crankpin during grinding thereof by a grinder, the improvement comprising:
- sequentially locating said crankshaft in plural clamping positions that are offset relative to each other axially of said crankshaft by a distance equal to a center-to-center spacing between two adjacent said crankpins or said journals or a multiple of said spacing;
- at each said clamping position, clamping said crankshaft at two said journals thereof, the two journals being clamped at any said clamping position being different than the two journals that are clamped in any other said clamping position;
- and
- at each said clamping position, rotating said crankshaft only about the axis of at least one selected said crankpin that is immediately adjacent at least one of said journals that is clamped at the respective said clamping position, and grinding said at least one selected crankpin by said grinder.
A grinding apparatus for successive grinding of crankpins of a crankshaft having a plurality of spaced crankpins and main bearing journals, said apparatus comprising:
- two chucks mounted at a distance from each other to enable said chucks to clamp the crankshaft at two of the journals thereof and to rotate the thus clamped crankshaft about the axis of at least one selected crankpin that is immediately adjacent at least one of the journals that is clamped;
- a device to sequentially locate the crankshaft in plural clamping positions that are offset relative to each other axially of the crankshaft by a distance equal to a center-to-center spacing between two adjacent crankpins or journals or a multiple of said spacing, such that the two journals clamped by said chucks at any said clamping position are different than the two journals that are clamped by said chucks in any other said clamping position;
- and
- a grinder movable to grind the at least one selected crankpin.
Dependencies are inferred from the claim text.