Sealing device for a bearing unit
View Patent ↗Sealing device for a bearing unit having at least one contact lip operatively in sliding contact with a contact surface of the bearing unit and in turn provided with a wedge portion which forms with respect to the contact surface a first angle (α) facing a medium to be contained and a second angle (β) opposite the first angle, wherein during operating conditions, the second angle (β) is smaller than the first angle (α) and with a first surface having a concave shape, the concavity of which is defined by a first radius (R 1 ); wherein the second angle (β) is between 48° and 55° and the length of the first radius (R 1 ) is between 2.0 mm and 10.00 mm.
1. A sealing device for a bearing unit, comprising:
at least one contact lip which is operatively in sliding contact with a contact surface of the bearing unit, the at least one contact lip including:
a wedge portion which forms with respect to the contact surface a first angle (α) facing a medium to be contained, the wedge portion further forms with respect to the contact surface a second angle (β) opposite to the first angle, wherein the wedge portion is configured such that during operating conditions the second angle (β) is less than the first angle (α); and
a first surface, adjacent to the second angle (β), with a concave shape, the concavity of which is defined by a first radius (R 1 ).
2. The sealing device of claim 1 , wherein the second angle (β) is between 48° and 55°.
3. The sealing device of claim 1 , wherein the length of the first radius (R 1 ) is between 2.0 mm and 10.0 mm.
4. The sealing device of claim 1 , wherein the first angle (α) is between 50° and 65°.
5. The sealing device of claim 1 , wherein the first angle (α) is equal to 55° and the second angle (β) is equal to 54°.
6. The sealing device of claim 1 , further comprising a third angle (γ) between a radial direction and a second surface, opposite the first surface with respect to the wedge portion, where the third angle (y) is between 50° and 65°.
7. The sealing device of claim 1 , wherein a base thickness (HLT) of the contacting lip is between 0.3 mm and 1.2 mm.
8. The sealing device of claim 1 , further comprising a third concave surface defined by an angle of attack (δ), formed with the radial direction, by a depth (HG) and by a third radius (R 3 ).
9. The sealing device of claim 8 , wherein the angle of attack (δ) is between 20° and 35°.
10. The sealing device of claim 8 , wherein the depth (HG) is between 0.1 mm and 0.5 mm.
11. The sealing device of claim 8 , wherein the third radius (R 3 ) is between 0.2 mm and 0.8 mm.
12. A bearing unit provided with a sealing device according claim 1 .
13. A sealing device for a bearing unit, comprising:
at least one contact lip which is operatively in sliding contact with a contact surface of the bearing unit, the at least one contact lip including:
a wedge portion which forms with respect to the contact surface a first angle (α) facing a medium to be contained, the wedge portion further forms with respect to the contact surface a second angle (β) opposite to the first angle, wherein the wedge portion is configured such that during operating conditions the second angle (β) is less than the first angle (α); and
a first surface, adjacent to the second angle (β), with a concave shape, the concavity of which is defined by a first radius (R 1 ),
wherein the second angle (β) is between 48° and 55°, and further wherein the length of the first radius (R 1 ) is between 2.0 mm and 10.0 mm.
14. A sealing device for a bearing unit, comprising:
at least one contact lip which is operatively in sliding contact with a contact surface of the bearing unit, the at least one contact lip including:
a wedge portion which forms with respect to the contact surface a first angle (α) facing a medium to be contained, the wedge portion further forms with respect to the contact surface a second angle (β) opposite to the first angle, wherein the wedge portion is configured such that during operating conditions the second angle (β) is less than the first angle (α);
a first surface, adjacent to the second angle (β), with a concave shape, the concavity of which is defined by a first radius (R 1 ); and
a third concave surface defined by an angle of attack (δ), formed with the radial direction, by a depth (HG) and by a third radius (R 3 ),
wherein the second angle (β) is between 48° and 55°, and further wherein the length of the first radius (R 1 ) is between 2.0 mm and 10.0 mm.
15. The sealing device of claim 14 , wherein the angle of attack (δ) is between 20° and 35°.
16. The sealing device of claim 14 , wherein the depth (HG) is between 0.1 mm and 0.5 mm.
17. The sealing device of claim 14 , wherein the third radius (R 3 ) is between 0.2 mm and 0.8 mm.
18. The sealing device of claim 14 , wherein the length of the first radius (R 1 ) is between 2.0 mm and 10.0 mm.
19. The sealing device of claim 14 , wherein the first angle (α) is equal to 55° and the second angle (β) is equal to 54°.
20. The sealing device of claim 14 , further comprising a third angle (γ) between a radial direction and a second surface, opposite the first concave surface with respect to the wedge portion, where the third angle (y) is between 50° and 65°.