Sealing device
A sealing device for sealing an annular space constituted by an inside member and an outside member which rotate relatively to each other includes a core metal having a cylindrical portion fitted to one of the inside member and the outside member, and a seal lip member fixed to the core metal and having a plurality of lip portions contacting the other of the inside member and the outside member. The lip portions includes a first lip portion provided at a position closest to the outside and blocking ventilation between the outside and a space existing between the lip portions, and another lip portion provided at a position farther from the outside than the first lip portion. The other lip portion is provided with a through-hole, which is open to front and rear surfaces and allow ventilation, at a position apart from a contact portion with the other member.
1. A sealing device for sealing an annular space constituted by an inside member and an outside member which rotate relatively to each other, the sealing device comprising:
a core metal having a cylindrical portion fitted to one of the inside member and the outside member; and
a seal lip member fixed to the core metal and having a plurality of lip portions contacting the other of the inside member and the outside member,
wherein the plurality of lip portions comprises a first lip portion provided at a position closest to the outside and blocking ventilation between the outside and a space existing between the lip portions, and another lip portion provided at a position farther from the outside than the first lip portion,
the other lip portion is provided with a through-hole, which is open to front and rear surfaces to allow ventilation, at a position apart from a contact portion with the other member,
the other lip portion comprises a second lip portion provided at a position which is closest to the annular space, and a third lip portion provided at a position which is second closest to the annular space, and
the through-hole is provided in each of the second lip portion and the third lip portion.
2. The sealing device according to claim 1 , wherein the through-hole is provided so as to be separated from the other member by 0.1 mm or more in a state in which the lip portion where the through-hole is provided comes into contact with the other member.
3. The sealing device according to claim 1 , wherein grease is supplied to the other lip portion so as to cover at least one of openings on the front side or the rear side of the through-hole.
4. The sealing device according to claim 3 , wherein the opening area of the through-hole is formed to have a size to allow air to pass hindering the grease from passing.
5. The sealing device according to claim 3 , wherein the through-hole is provided so as to be separated from the other member by 0.1 mm or more in a state in which the lip portion where the through-hole is provided comes into contact with the other member.