Sealing system for mutually rotating machine parts

A seal ring (3) to be situated between two mutually axially movable and rotating machine parts (1, 5) which can be mutually eccentrically displaced, for preventing contaminants located on one side of said seal ring from passing by said seal ring, during movement of the two machine parts, to an opposed oil side of said seal ring, comprising:

• a scraper lip (12) being slidably engagable with one of the machine parts (1, 5) and integrally formed with a guide ring (16), concentrically guided in relation to that one machine part, and a support ring (7), secured to the other machine part (5, 1), being connected with said guide ring (16) and said scraper lip (12) via a radially yieldable intermediate wall (6), characterized in that
• said seal ring has a substantially z-shaped cross section and said guide ring has an elongate cylindrical surface for engaging said one machine part (1 or 5), in use, and guiding said scraper lip (12) with respect to said one machine part (1 or 5),
• said scraper lip (12) is axially stiff and forms a sealing edge (11) with a surface (12A), facing the contaminant side, said surface extends substantially perpendicularly to said one machine part, and said scraper lip (12) has a radial notch (9) of wedge-shaped cross section between said sealing edge (11) and said guide ring (16),
• said scraper lip (12), when assembled, abuts against said one machine part (1 or 5) and is movable relative to and forms an acute angle (31) with said one machine part,
• said seal ring comprising an elastomeric material having a tensile strength of more than 25 N/mm.sup.2, an abrasion of less than 50 m.sup.3 and a Shore-A hardness of more than 50, and
• said seal ring further includes a resilient shaft seal (2), for sealing said one machine part (1 or 5), located adjacent the seal ring (3) on the oil side.

A seal ring to be situated between two mutually axially movable and rotating machine parts (1, 5) which can be mutually eccentrically displaced for preventing a contaminant located on one side of said seal ring from passing by said seal ring, during movement of the two machine parts, to an opposed oil side of said seal ring, comprising:

• a scraper lip (12) being slidably engagable with one of the machine parts (1, 5) and integrally formed with a guide ring (16) that is concentrically guided in relation to that one machine part, and a support ring (7), secured to the other machine part (5, 1), being connected with said guide ring (16) and said scraper lip (12) via a radially yieldable intermediate wall (6), characterized in that
• said seal ring (3) has a generally z-shaped cross section and said guide ring has an elongate cylindrical surface for engaging said one machine part (1 or 5), in use, and guiding said scraper lip with respect to said one machine part (1 or 5),
• said seal ring is made of an elastomeric material having a tensile strength of more than 25 N/mm.sup.2, an abrasion of less than 50 m.sup.3 and a Shore-A hardness of more than 50,
• when said seal ring is assembled, said guide ring (16) faces the oil side of the seal and said scraper lip (12) extends substantially axially from said guide ring toward the contaminant side of the seal, said scraper lip (12) is axially stiff and forms a sealing edge (11) with a surface (12A), facing the contaminant side, said surface extends substantially perpendicularly to said one machine part, a radial notch (9) of wedge-shaped cross section is formed between said sealing edge (11) and said guide ring (16), and said scraper lip (12) abuts against said one machine part (1 or 5) and is movable relative to and forms with said one machine part an angle (31) of approximately 20 degrees, and
• said seal ring further includes a resilient shaft seal (2), for sealing said one machine part (1 or 5), located adjacent the seal ring (3) on the oil side.