Spin-on filter assembly

1. A filter assembly removably-coupled to an inner surface of a filter head, comprising:

a filter body defining a mouth;

a filter element disposed in the filter body; and

a seal disposed on the mouth, the seal having a seal body defining a center axis;

wherein the seal body has an axial surface perpendicular to the center axis and an outer annular surface revolved about the center axis, the axial surface forming a first sealing surface with a corresponding axial surface of the filter head and a portion of the outer annular surface defining a substantially frustoconical shape that corresponds to and is interfaced with the inner surface of the filter head having a corresponding frustoconical shape, the portion of the outer annular surface forming a second sealing surface with the inner surface of the filter head.

2. The filter assembly of claim 1 , wherein a radius of the outer annular surface about the center axis increases from a plane of the axial surface along the center axis to a threshold radius.

3. The filter assembly of claim 2 , wherein the radius of the outer annular surface about the center axis decreases along the center axis after reaching the threshold radius.

4. The filter assembly of claim 1 , wherein the filter body defines a substantially cylindrical shape and has first and second opposite end portions, the first end portion defining the mouth.

5. The filter assembly of claim 1 , further comprising a cover disposed over the mouth, the seal body defining a groove received by at least one of a mouth rim of the filter body and the cover.

6. The filter assembly of claim 5 , further comprising a biasing element disposed in the filter body and biasing the filter element toward the mouth.

7. The filter assembly of claim 6 , further comprising a filter support disposed in the filter body and arranged to support at least a portion of the filter element on a side opposite of the biasing element, the biasing element biasing the filter element against the filter support.

8. A filter assembly comprising:

a filter body defining a mouth;

a filter element disposed in the filter body; and

a seal disposed on the mouth, the seal having a seal body defining a center axis;

wherein the seal body has an axial surface perpendicular to the center axis and an outer annular surface forming a shoulder with the axial surface, a portion of the outer annular surface extending away from the axial surface at an angle greater than 90 degrees, the axial surface being configured to form a first sealing surface with a corresponding axial surface of a filter head and the portion of the outer annular surface being configured to form a second sealing surface with an inner surface of the filter head.

9. The filter assembly of claim 8 , wherein a portion of the outer annular surface defining at least one of an arcuate and a substantially frustoconical shape.

10. The filter assembly of claim 8 , wherein the filter body defines a substantially cylindrical shape and has first and second opposite end portions, the first end portion defining the mouth.

11. The filter assembly of claim 8 , further comprising a cover disposed over the mouth, the seal body defining a groove received by at least one of a mouth rim of the filter body and the cover.

12. The filter assembly of claim 11 , further comprising a biasing element disposed in the filter body and biasing the filter element toward the mouth.

13. The filter assembly of claim 12 , further comprising a filter support disposed in the filter body and arranged to support at least a portion of the filter element on a side opposite of the biasing element, the biasing element biasing the filter element against the filter support.

14. A filter assembly comprising:

a filter body defining a mouth;

a filter element disposed in the filter body; and

a seal disposed on the mouth, the seal having a seal body defining a center axis;

wherein the seal body has first and second axial surfaces disposed opposite of each other and perpendicular to the center axis, wherein the seal body defines a interference-fit groove, wherein the seal body having an outer annular surface concentric with the center axis and defining a surface extending away from the first axial surface at an angle greater than 90 degrees, wherein the second axial surface attached to the mouth, the first axial surface being configured to form a first sealing surface with a corresponding axial surface of a filter head and the outer annular surface being configured to form a second sealing surface with an inner surface of the filter head.

15. The filter assembly of claim 14 , wherein a radius of the outer annular surface about the center axis increases from a plane of the first axial surface along the center axis to a threshold radius.

16. The filter assembly of claim 15 , wherein the radius of the outer annular surface about the center axis decreases along the center axis after reaching the threshold radius.

17. The filter assembly of claim 14 , wherein the filter body defines a substantially cylindrical shape and has first and second opposite end portions, the first end portion defining the mouth.

18. The filter assembly of claim 14 , further comprising:

a cover disposed over the mouth, wherein the valley-shaped interference-fit groove is received by at least one of a mouth rim of the filter body and the cover.

19. The filter assembly of claim 18 , further comprising a biasing element disposed in the filter body and biasing the filter element toward the mouth.

20. The filter assembly of claim 19 , further comprising a filter support disposed in the filter body and arranged to support at least a portion of the filter element on a side opposite of the biasing element, the biasing element biasing the filter element against the filter support.