Sealing material
The sealing material is configured to be installed in a dovetail groove. The sealing material has a seal cross-section including a main body arranged on a bottom surface of the dovetail groove, and a lip portion which is bent from an end of the main body and extends toward an outside of the dovetail groove. The seal cross-section has such a V shape that each of the main body and the lip portion extends linearly from a bending position between the main body and the lip portion. A width B 1 of the main body in a direction orthogonal to a direction in which the main body extends linearly is not more than a width B 2 of the lip portion in a direction orthogonal to a direction in which the lip portion extends linearly. This configuration provides the sealing material which can be used under an extremely low load.
1. A sealing material configured to be installed in a dovetail groove and having a closed annular shape,
the sealing material having a seal cross-section comprising
a main body arranged on a bottom surface of the dovetail groove, and
a lip portion bent from an end of the main body and extending toward an outside of the dovetail groove,
the seal cross-section having such a V shape that each of the main body and the lip portion extends linearly from a bending position between the main body and the lip portion,
said main body having a first front surface which abuts a bottom surface of the dovetail groove, and a first back surface located on a back side with respect to said first front surface and extends parallel to said first front surface,
said lip portion having a second front surface which abuts a side surface of the dovetail groove, and a second back surface located on a back side with respect to said second front surface and extends parallel to said second front surface, and
a width of the main body in a direction orthogonal to a direction in which the main body extends linearly between said first front surface and said first back surface being not more than a width of the lip portion in a direction orthogonal to a direction in which the lip portion extends linearly between said second front surface and said second back surface.
2. The sealing material according to claim 1 , wherein the width of the main body is equal to the width of the lip portion.
3. The sealing material according to claim 1 , wherein a length of the main body in the direction in which the main body extends linearly is equal to a length of the lip portion in the direction in which the lip portion extends linearly.
4. The sealing material according to claim 1 , wherein a length of the main body in the direction in which the main body extends linearly is larger than a length of the lip portion in the direction in which the lip portion extends linearly.
5. The sealing material according to claim 1 , wherein a length of the main body in the direction in which the main body extends linearly is smaller than a length of the lip portion in the direction in which the lip portion extends linearly.
6. The sealing material according to claim 1 , wherein the sealing material in the closed annular shape has an elongation percentage (((Rb−Ra)/Ra) ·100) of not less than 0% and not more than 4%, where Ra is an inner diameter of the sealing material in the closed annular shape and Rb is an inner diameter of the dovetail groove in a closed annular shape.
7. The sealing material according to claim 1 , wherein
a seal angle b formed by the first front surface and the second front surface satisfies a relation 0.7a£b£1.3a, where a is a groove angle formed by the bottom surface and the side surface of the dovetail groove.