A sealing ring includes: a sealing body of a rubber-elastic sealing material; and an intermediate element which is connected to the sealing body. The sealing body includes a retaining collar which delimits an undercut. The intermediate element is arranged in the undercut and assigned to the retaining collar in a non-adhered and non-destructively detachable manner.

A rotary seal seals a high-pressure region from a low-pressure region and has an assembly sleeve made of a rubber elastic material and at least one pressure-activatable rotary seal element with a seal edge. When a specified differential pressure value is exceeded, the seal edge of the rotary seal element rests sealingly against the seal surface of a machine part, thereby directly displacing a support element elastically supported on the rubber elastic assembly sleeve. When the specified differential pressure value is undershot, the support element is moved rearwards axially in the direction of the high-pressure region such that the seal edge of the rotary seal element is moved backwards into the seal edge rest position in which the rotary seal element lies against the seal surface without contact surface pressure or substantially without contact surface pressure or is arranged at a distance from the seal surface.

A rotary seal seals a high-pressure region from a low-pressure region and has an assembly sleeve made of a rubber elastic material and at least one pressure-activatable rotary seal element with a seal edge. When a specified differential pressure value is exceeded, the seal edge of the rotary seal element rests sealingly against the seal surface of a machine part, thereby directly displacing a support element elastically supported on the rubber elastic assembly sleeve. When the specified differential pressure value is undershot, the support element is moved rearwards axially in the direction of the high-pressure region such that the seal edge of the rotary seal element is moved backwards into the seal edge rest position in which the rotary seal element lies against the seal surface without contact surface pressure or substantially without contact surface pressure or is arranged at a distance from the seal surface.

A sealing arrangement for detecting thickness (t) of a sealing element (2) of a seal (1) wherein the sealing surface (3) at frontside of the sealing element (2) is arranged to be in sliding contact with sealed surface (4), wherein at least one sensor (5) measures the thickness of the sealing element (2) and is mounted to the surrounding component (10) of the sealed surface (4). The sensor (5) is positioned opposite the sealing element (2). The sensor (5) receives a response from a transverse border of the sealing element (2) or from an electrically conductive insert (6) or from an insert (6) of magnetic material, which insert (6) is embedded within the sealing element (2) or is connected to the backside of the sealing element (2). The thickness (t) is detected and/or measured along the length of the sealing element (2).

A seal ring has, on an outer peripheral surface side thereof, a pair of recessed parts 140 extending in a circumferential direction on both sides in a width direction thereof to form a projection part 120 between the pair of recessed parts 140, and has a plurality of ribs 130 connected to the projection part 120 and extending to lateral surfaces of the seal ring at intervals in the circumferential direction inside the pair of recessed parts 140, and a plurality of ribs 130 arranged on a sealed region side among the plurality of ribs 130 have lateral-wall surfaces on an upstream side in a relative rotation direction of a housing with respect to a shaft, each of the lateral-wall surfaces having inclined surfaces inclined from the upstream side to a downstream side in the relative rotation direction of the housing from the projection part 120 toward the lateral surfaces of the seal ring.

A seal ring has, on an outer peripheral surface side thereof, a pair of recessed parts 140 extending in a circumferential direction on both sides in a width direction thereof to form a projection part 120 between the pair of recessed parts 140, and has a plurality of ribs 130 connected to the projection part 120 and extending to lateral surfaces of the seal ring at intervals in the circumferential direction inside the pair of recessed parts 140, and a plurality of ribs 130 arranged on a sealed region side among the plurality of ribs 130 have lateral-wall surfaces on an upstream side in a relative rotation direction of a housing with respect to a shaft, each of the lateral-wall surfaces having inclined surfaces inclined from the upstream side to a downstream side in the relative rotation direction of the housing from the projection part 120 toward the lateral surfaces of the seal ring.

A sealing device seals a gap between a housing and a rotational shaft located in a shaft hole provided in the housing. The sealing device includes: an annular mounted part that is to be mounted on an inner peripheral surface of the shaft hole; an inner annular part located radially inside of the mounted part; a seal lip extending from the inner annular part and for being in contact with the outer peripheral surface of the rotational shaft; a bellows part connecting the mounted part with the inner annular part; a sound insulation ring fixed to the mounted part and expanding radially inward from the mounted part, the sound insulation ring including an opening through which the rotational shaft passes; and a circular annular sound insulation lip projecting from the inner annular part or the bellows part toward the sound insulation ring and including a distal end being in slidable contact with the sound insulation ring. The sound insulation ring includes a circular annular part with which the distal end of the sound insulation lip is in contact, and a protruding wall disposed radially inside of the circular annular part and radially outside of the opening, the protruding wall protruding toward the inner annular part.

A sealing unit (115) for sealing an annular gap (109) formed between a seal wear ring (106) and a seal carrier (112) has a sealing ring holder (118) which is U-shaped in a receptacle region and which, together with the receptacle region, encloses a fixing region (209) of the sealing ring (121).

A sealing unit (115) for sealing an annular gap (109) formed between a seal wear ring (106) and a seal carrier (112) has a sealing ring holder (118) which is U-shaped in a receptacle region and which, together with the receptacle region, encloses a fixing region (209) of the sealing ring (121).

A seal assembly is disclosed for providing a seal against a body. The assembly includes an elastically-deformable sealing member with a sealing surface facing a surface of the body. The assembly also includes a shape memory alloy biasing member. The biasing member is configured to bias the sealing surface to different positions with respect to the surface of the body or with different pressures against the surface of the body in response to a displacement response of the shape memory alloy to thermal stimulus. The body can be dynamic relative to the sealing member such as a rotatable shaft, static relative to the sealing member such as a case or housing, or can be either static or dynamic in response to the SMA displacement such as a snubber assembly.