Mercedes-benz Aktiengesellschaft

Walter Burbock

Peter Linden

Gerhard Doll

Dieter Burger

Volker Keck

Helmut Seitz

The invention resides in a hollow rocker-arm shaft with multiple internal passages for an internal combustion engine which rocker-arm shaft consists of two shell sections forming circular segments which are welded together by a weld seam extending along the longitudinal edges of the circular segments and at least one dividing wall extends through the interior of the hollow shaft between the weld seams and divides the interior of the hollow shaft into at least two passages.

Hollow rocker-arm shaft for internal combustion engines

A device for induction heating of the inside of cylinder liners of reciprocating-piston engines to a transformation temperature, for the purpose of hardening. An inductor head is equipper with an aligning device designed as a spreadable cage which is equipped on the outside with clamping bars, clamping bosses a clamping shells which can be applied free from play and under the effect of force against the inner surface of the cylinder liner. The inductor loop is also displaced radially and brought into the working position by means of these clamping shells. Heating and hardening is carried out only with the inductor head in the clamped and exactly aligned state, whereas, after the clamping shells and the inductor loops have been released, a further indexed movement of the inductor head is possible. The work is carried out at relatively high alternating-current frequencies in the range between 400 and 500 kHz and at relatively high energy densities in the range above 5 kw/cm.sup.2 .

Growing community of inventors

Stuttgart, Germany

Walter Burbock