Nok Corporation

Toshiyuki Maeda

Yoshiyuki Abe

Yuhei Tabuchi

The present invention is to provide a sealing device that has a small number of parts as three or less to achieve a more compact sealing device. The sealing device is combined an inner seal ring, an outer seal ring held in an outer circumferential holding groove of the inner seal ring, and a back ring. The outer seal ring satisfies a dimensional size relationship of T&#x3e;A when T is the radial thickness dimension of the outer seal ring, G is the protrusion gap dimension, R is the radial width dimension of the chamfered sections on the edges of the open side of the seal installation groove, and A is the sum of the protrusion gap dimension G and the radial width dimension R of the chamfered sections on the edges of the open side.

Sealing device

Object: To provide a sliding member with a low friction coefficient in which, when fine dents are formed in a surface of the sliding member by dimpling using a laser, no hard raised portions are generated, and which does not damage a mating member; and to provide a process for producing the sliding member. Solution Means: A sliding member comprising a polyamide resin and 10 to 50 wt % of a fibrous filler selected from the group consisting of carbon fibers, aramid fibers, and whiskers, and having fine dents formed in a sliding surface thereof by dimpling using a laser; and a process for producing a sliding member comprising adding 10 to 50 wt % of a fibrous filler selected from the group consisting of carbon fibers, aramid fibers, and whiskers to a polyamide resin, and forming fine dents in a sliding surface of the sliding member by dimpling using a laser.

Sliding member and process for producing the same

A sealing device in which a good lubricating oil film is formed along the entire circumference of a sliding surface. The sealing device () is fitted in an annular groove formed in either of two elements that are a housing having a shaft hole and a shaft inserted through the shaft hole, and the sealing device () seals an annular gap between the two elements. The sealing device () has a seal ring () sliding against the other element by relative axial movements of the two elements. In the seal ring (), on each of axially opposite ends of a sliding surface () sliding against the other element, there are formed grooves () extending from an end surface () of the seal ring () toward the axial center of a sliding surface ().

A sealing device is provided which is capable of reducing its sliding resistance. In a sealing devicewhich is fitted into an annular groove formed in one of a housing with a shaft hole and a shaft inserted into said shaft hole and serves to seal an annular gap between these two members, and which includes a seal ringmade of a resin that is in sliding contact with the other of the two members, and an elastic ringthat is fitted between the seal ringand the annular groove, the seal ring has a plurality of concave portionsformed on its sliding surfacewhich is in sliding contact with the other member.

Sealing device and production method thereof

A sealing device () having: a slide ring () and a back ring (). The sealing device () is configured to seal an annular gap between a housing having a shaft hole, and a shaft inserted through the shaft hole. The slide ring () has: a through-cut (), comprising a circumferential cut (A), and axial cuts (B) extending from both ends of the circumferential cut, along the axial direction; and multiple parting lines (A,B) formed on a surface of the slide ring (). The parting lines (A,B) are arranged so that the parting lines (A,B) are not overlapped with the circumferential cut (A) exposed at the junction surface of the slide ring () with the back ring (), throughout the lengthwise direction of the circumferential cut.

A sealing device in which a good lubricating oil film is formed along the entire circumference of a sliding surface. The sealing device () is fitted in an annular groove formed in either of two elements that are a housing having a shaft hole and a shaft inserted through the shaft hole, and the sealing device () seals an annular gap between the two elements. The sealing device () has a seal ring () sliding against the other element by relative axial movements of the two elements. In the seal ring (), on each of axially opposite ends of a sliding surface () sliding against the other element, there are formed grooves () extending from an end surface () of the seal ring () toward the axial center of a sliding surface (). Further, in the seal ring (), the boundary between each groove () and the sliding surface () is formed only by lines inclined relative to the direction of sliding of the sliding surface (), and grooves () are circumferentially adjacently arranged in the seal ring () so that regions each having the boundary formed by the inclined lines are continuous along the entire circumference of the sliding surface ().

Growing community of inventors

Kitaibaraki, Japan

Toshiyuki Maeda