Sealing device
A sealing device for sealing an annular space formed between an outer member and an inner member. The sealing device includes a seal member and a slinger member, the slinger member includes a slinger extension ring portion provided on an outer side in radial direction further than an outer diameter side end portion of a slinger ring portion, facing an axially outer side end surface of the outer member, and extending in radial direction. A first labyrinth extending in radial direction is formed between the slinger extension ring portion and the outer member, an outer side end portion of the first labyrinth in radial direction opening toward an outer space. A second labyrinth extending in axial direction is formed between an outer diameter side slinger cylindrical portion and a seal fitting cylindrical portion, the second labyrinth communicating with the first labyrinth.
1. A sealing device for sealing an annular space, the sealing device being attached on an axially outer side end portion of the annular space formed between an outer member and an inner member which coaxially rotate in a relative manner, the axially outer side end portion of the annular space being on an outer space side,
the sealing device comprising:
a seal member to be fitted to an inner peripheral surface of the outer member; and
a slinger member to be fitted to an outer peripheral surface of the inner member,
the seal member comprising:
a core body; and
a seal lip which is integrated with the core body and is constituted with an elastic body in contact with the slinger member,
the core body comprising:
a seal fitting cylindrical portion to be fitted to the inner peripheral surface of the outer member; and
an inner diameter side seal ring portion extending into an inner side in a radial direction from an axially inner side end portion of the seal fitting cylindrical portion,
the slinger member comprising:
a slinger fitting cylindrical portion to be fitted to the outer peripheral surface of the inner member,
a slinger ring portion extending from an axially outer side end portion of the slinger fitting cylindrical portion to an outer side in the radial direction,
an outer diameter side slinger cylindrical portion extending from an outer diameter side end portion of the slinger ring portion to an axially inner side and facing an inner peripheral surface of the seal fitting cylindrical portion, and
a slinger extension ring portion provided on the outer side in the radial direction further than the outer diameter side end portion of the slinger ring portion, facing an axially outer side end surface of the outer member, and extending in the radial direction,
wherein a first labyrinth is formed between the slinger extension ring portion and the outer member, an outer side end portion of the first labyrinth in the radial direction being open toward an outer space, the first labyrinth being a gap extending in the radial direction,
wherein a second labyrinth is formed between the outer diameter side slinger cylindrical portion and the seal fitting cylindrical portion, the second labyrinth communicating with the first labyrinth and being a gap extending in an axial direction, and
wherein the slinger extension ring portion is made exclusively of rubber or magnetic rubber.
2. The sealing device according to claim 1 ,
the core body further comprising an outer diameter side seal ring portion extending from an axially outer side end portion of the seal fitting cylindrical portion to the outer side in the radial direction so as to face the axially outer side end surface of the outer member,
wherein the first labyrinth is formed between the outer diameter side seal ring portion and the slinger extension ring portion.
3. The sealing device according to claim 2 ,
wherein the outer diameter side seal ring portion has a cover constituted with an elastic body on an axially outer side surface, and
wherein the first labyrinth is formed between the cover and the slinger extension ring portion.
4. The sealing device according to claim 3 ,
wherein a plurality of protrusions are provided on an axially outer side surface of the cover, the protrusions projecting outward in the axial direction and being provided annularly along a circumferential direction.
5. The sealing device according to claim 1 ,
wherein a plurality of protrusions are provided on an axially inner surface of the slinger extension ring portion, the protrusions projecting inward in the axial direction and being provided annularly along a circumferential direction.
6. The sealing device according to claim 5 ,
wherein the protrusions provided at the slinger extension ring portion are formed so as to increase in diameter inward in the axial direction.
7. The sealing device according to claim 2 ,
wherein a plurality of protrusions are provided on an axially inner surface of the slinger extension ring portion, the protrusions projecting inward in the axial direction and being provided annularly along a circumferential direction.
8. The sealing device according to claim 3 ,
wherein a plurality of protrusions are provided on an axially inner surface of the slinger extension ring portion, the protrusions projecting inward in the axial direction and being provided annularly along a circumferential direction.
9. The sealing device according to claim 4 ,
wherein a plurality of protrusions are provided on an axially inner surface of the slinger extension ring portion, the protrusions projecting inward in the axial direction and being provided annularly along the circumferential direction.
10. The sealing device according to claim 7 ,
wherein the protrusions provided at the slinger extension ring portion are formed so as to increase in diameter inward in the axial direction.
11. The sealing device according to claim 8 ,
wherein the protrusions provided at the slinger extension ring portion are formed so as to increase in diameter inward in the axial direction.
12. The sealing device according to claim 9 ,
wherein the protrusions provided at the slinger extension ring portion are formed so as to increase in diameter inward in the axial direction.