Sumitomo Rubber Industries Limited

Nakata Engineering Co., Ltd.

Hiroshi Ihara

Hiroyuki Onimatsu

Naoyasu Nakao

Noboru Ishihara

Nozomu Nishioka

In a gear pump device for rubber extrusion, prolongation of the maintenance intervals is intended by preventing rubber scorch occurring at the gear support-shaft portion. It has a bushing ringinserted in a gear-housing boreof a housing. The bushing ringrotatably supports a support-shaft portionof a gearaccommodated in the gear-housing bore. The bushing ringhas a bearingand a sealing meansbuilt-in. The sealing meansincludes a seal ringof which cross section is ]-shaped and which has a first lip portioncontacting with the outer peripheral surface of the support-shaft portion, a second lip portiondisposed outside thereof in the radial direction, and a side wall portionconnecting between outer ends in the axial direction, of the first and second lip portions

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Kobe, Japan

Hiroshi Ihara