Firma Carl Freudenberg

Karl Hoff

Herbert Schumacher

Erich Habel

Hermann Metzner

A joint pin seal for a caterpillar track. The join pin seal comprises a support ring of hard elastomer material having a cylindrical inner wall. The support ring is firmly pressed in a housing bore which is adjacent a relatively movable machine part to be sealed. The support ring comprises a stiffening ring contacting the rear wall of the housing bore and a lip ring adjacent the machine part to be sealed. The lip ring has a sealing lip which presses against the surface of the machine part to be sealed. The stiffening ring is tapered in notch-like fashion into said lip ring forming a membrane at the transition into the lip ring and provides the support ring with a notch between the lip ring and the stiffening ring. A pressure ring, formed from a softer elastomer material, is disposed within the notch and contacts the housing bore wall. The pressure ring presses the sealing lip into the relatively movable machine part to be sealed. The ratio of the average radial distance from the membrane to the sealing lip to the average radial distance from the center line of the pressure ring area contacting the lip ring to the sealing lip is about 0.7 to 1.4.

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Monchen-Gladbach, Germany

Karl Hoff