Single seal with resilient member

A single seal assembly for the sealing of a rotary shaft extending through a wall of a housing and seal off a chamber inside the housing from outside the wall, said seal assembly comprising a flange adapted to be mounted on the wall, an outer sealing ring and an inner sealing ring disposed on the shaft within the chamber inside the housing, said sealing rings being in sliding and sealing contact with each other, the outer sealing ring being secured to the shaft for rotation therewith the inner sealing ring surrounding said shaft and connected to an axially extending tension coil spring, said axially extending coil spring having an outer end fastened to said outer sealing ring and rotating with the shaft, said coil spring having an inner end secured to said inner ring and producing a pulling force acting in a direction to pull the inner ring against the outer ring to increase contact between the sealing rings while developing a torque to drive the inner sealing ring in rotation with said shaft, wherein the inner sealing ring is provided with an internal groove following the pitch of the spring, said spring being threaded in the groove and ending with a straight axially directed part engaging a recess in the sealing ring, and the outer end of the coil spring is attached to an outer retaining ring secured to the outer sealing ring, said outer retaining ring being provided with an internal groove following the pitch of the spring, the spring being threaded in the groove and ending with a straight axially directed part engaging a recess in the outer retaining ring.

A single seal assembly for the sealing of a rotary shaft extending through a wall of a housing and, seal off a chamber inside the housing from outside the wall, said seal assembly comprising a flange adapted to be mounted on the wall, an outer sealing ring and an inner sealing ring disposed on the shaft within the chamber inside the housing, said sealing rings being in sliding and sealing contact with each other, the outer sealing ring being secured to the shaft for rotation therewith, the inner sealing ring surrounding said shaft and connected to an axially extending tension coil spring, said axially extending coil spring having an outer end fastened to said outer sealing ring and rotating with the shaft, said coil spring having an inner end secured to said inner ring and producing a pulling force acting in a direction to pull the inner ring against the outer ring to increase contact between the sealing rings while developing a torque to drive the inner sealing ring in rotation with said shaft, wherein the inner end of the coil spring is attached to the inner sealing ring by means of a retaining ring, which is provided with an internal groove following the pitch of the spring, the spring being threaded in the groove and ending with a straight axially directed part engaging a recess in the retaining ring, and the outer end of the coil spring is attached to an outer retaining ring secured to the outer seal ring, said outer retaining ring being provided with an internal groove following the pitch of the spring, the spring (8) being threaded in the groove and ending with a straight axially directed part engaging a recess in the outer retaining ring.