| 摘要 |
An object is to provide a backup ring manufacturable with an angle of a cut portion set to a standard cut angle even in the case of a product having a small diameter etc. due to dimensional limitation of a device used therewith, and is solved by a sealing device characterized in that a backup ring 1 is disposed in an annular gap 4 formed by disposing a sloped surface 20 on a member surface of one of two members, i.e., a shaft 2 and a housing 3 having a shaft hole in which the shaft 2 is inserted, with a distance from a counterpart member gradually reduced from a high pressure side toward a low pressure side, that the backup ring 1 is in contract with the sloped surface 20 on the low pressure side relative to a mounted seal member 5 made of an annular elastic member, that the backup ring 1 has an axially extending cylindrical portion 10 and a projecting portion 11 continuously disposed on an end portion of the cylindrical portion 10 on the high pressure side and formed to annularly project in a radial direction from the end portion toward the sloped surface 20, and that the projecting portion 11 has a radial tip surface made up of a taper surface 12 facing the sloped surface 20. |
| 主权项 |
1. A sealing device having a seal member made of an annular elastic material and a backup ring arranged in an annular gap, the annular gap being formed between two members that are a shaft and a housing having a shaft hole in which the shaft is inserted, the two members having a sloped surface disposed on a member surface of one of the two members with a distance from a counterpart member gradually reduced from a high pressure side toward a low pressure side, the backup ring being in contact with the sloped surface on the low pressure side relative to the seal member,
the backup ring having an axially extending cylindrical portion and a projecting portion continuously disposed on an end portion of the cylindrical portion on the high pressure side and formed to annularly project in a radial direction from the end portion toward the sloped surface, the projecting portion having a radial tip surface made up of a taper surface facing the sloped surface. |
