Apparatus for hardening a cylindrical bearing on a shaft by...

Details Apparatus for hardening a cylindrical bearing on a shaft by... Apparatus for hardening a cylindrical bearing on a shaft by...

2006-12-05

2006-12-05

Leung, Philip H. (Department: 3742)

Electric heating

Inductive heating

Specific heating application

C219S635000, C219S672000, C219S676000, C148S567000, C266S129000

Reexamination Certificate

active

07145115

ABSTRACT:
An apparatus for hardening cylindrical bearing locations on a shaft, in particular a crankshaft, in which transition radii to the adjacent shaft parts are of undercut design, is provided with a heating unit, which is connected to a power supply, and with an inductor. The inductor has two heating conductor arms, which are arranged at a distance from one another and each run in the peripheral direction of the bearing location that is to be hardened. Each of the two heating conductor arms is provided with an inner bearing-surface hardening branch and two outer radius hardening branches, the bearing-surface hardening branch in each case being mechanically connected to the radius hardening branches by current-carrying elements which bear the radius hardening branches. The mechanical connection is sufficiently elastic for the radius hardening branches to be displaceable relative to the bearing-surface hardening branch in the axial direction of the shaft that is to be hardened.

REFERENCES:
patent: 6140625 (2000-10-01), Gezarzick et al.
patent: 6160248 (2000-12-01), Ottenwaelder et al.
patent: 6399928 (2002-06-01), Gezarzick et al.

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