| 摘要 |
A variable-throat exhaust turbocharger can be provided, in which is used a means to reduce wear of the contact surfaces of the connection pin parts which are formed integral with the lever plates or the drive ring and the grooves into which the connection pin parts are engaged, and which has a means to prevent slipping out of the drive ring from the nozzle mount toward the lever plate to prevent probable occurrence of fail in action of the variable nozzle mechanism caused by the slipping out of the drive ring is provided by the invention. In the invention, the connection pin parts to make connection between the lever plates and drive ring of the variable throat mechanism are formed integral with either the lever plates or the drive ring by extrusion or by precision casting, and at least the connection pin parts or grooves into each of which each of the connection pin parts is engaged are treated with surface hardening including diffusion coating.
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