Method and device for work-hardening a crankshaft
AssigneeMaschinenfabrik Alfing Kessler GmbH
InventorsALFONS REEB, JOCHEN SCHMIDT, KONRAD GRIMM
Life of this patent
Estimating the term…
Abstract
The invention relates to a method for work-hardening a crankshaft (4) comprising connecting rod journals (5), main bearing journals (6) and crank webs (7), the connecting rod journals (5) and the main bearing journals (6) being provided with oil holes (31). According to the invention, at least one end (30) of one of the oil holes (31) and/or at least one cylindrical portion (38) of the oil holes (31) is/are work-hardened.
Claims20
A method for the work hardening of a crankshaft which has connecting-rod bearing journals, main bearing journals and crank webs, wherein the connecting-rod bearing journals and the main bearing journals have oil bores, wherein at least one oil bore end of one of the oil bores is work-hardened by virtue of an impact force being introduced into the oil bore end by means of an impact head of an impact tool, wherein the oil bore end has a bevel and/or has a transition radius at the transition to a running surface of the respective journal, wherein the transition radius and/or the bevel is impact-hardened, and wherein the impact head for the impact hardening has a shaping portion whose shape is adapted to the transition radius to be hardened and/or to the bevel of the oil bore end.
A method for the work hardening of a crankshaft which has connecting-rod bearing journals, main bearing journals and crank webs, wherein the connecting-rod bearing journals and the main bearing journals have oil bores, wherein at least one cylindrical portion of the oil bore is work-hardened, wherein a spherical body is pushed into the oil bore of one of the connecting-rod bearing journals and passes from there directly, or via a connecting bore, to the oil bore of one of the adjoining main bearing journals, wherein the connecting bore and/or the oil bore of the main bearing journal have an inner diameter which is at least as large as the outer diameter of the spherical body.
An apparatus for the impact hardening of a crankshaft, wherein the crankshaft has connecting-rod bearing journals, main bearing journals and crank webs, and wherein the connecting-rod bearing journals and the main bearing journals have oil bores, wherein an impact force is introduced into at least one oil bore end of one of the oil bores by means of an impact head of an impact tool in order to impact-harden a bevel of the oil bore end, wherein the impact head for the impact hardening has a shaping portion whose shape is adapted to the bevel of the oil bore end.
An apparatus for the work hardening of a crankshaft, wherein the crankshaft has connecting-rod bearing journals, main bearing journals and crank webs, and wherein the connecting-rod bearing journals and the main bearing journals have oil bores, wherein at least one cylindrical portion of one of the oil bores is work-hardened by virtue of a spherical body being pushed into the oil bore of one of the connecting-rod bearing journals and passing from there directly, or via a connecting bore, to the oil bore of one of the adjoining main bearing journals, wherein the connecting bore and/or the oil bore of the main bearing journal have an inner diameter which is at least as large as the outer diameter of the spherical body.
Dependencies are inferred from the claim text.