Patent EA-003489-B1 (EA)
Title: Center tube with built in snap for automotive oil filter
Inventor: CLINE L STEVEN
IPC: B01D29/11
Filed: 2000-08-11
Abstract: 1. An oil filter assembly comprising: a filter housing formed to include a filter chamber, the filter housing including a base formed to include a release port located to drain oil from the filter chamber and a removable cover coupled to the base to form the filter chamber there between, a release valve mounted for movement relative to the base between an opened position allowing flow of oil from the filter chamber through the release port and a closed position blocking flow of oil from the filter chamber through the release port, a filter module positioned to lie in the filter chamber, the filter module including an exterior portion located in the filter chamber to contact oil admitted into the filter chamber through an oil inlet provided in the filter housing, the filter module being formed to include an interior portion defining a filtered-oil region located in the filter module to receive oil that has passed through the filter module from the exterior portion to the interior portion and arranged to discharge oil from the filter chamber through an oil outlet provided in the filter housing, a first biasing element arranged to urge the release valve away from the release port formed in the filter housing, and a second biasing element positioned to lie in a space formed between the filter module and the cover and arranged to urge the filter module in the filter chamber toward the base to move the release valve to the closed position against a biasing force generated by the first biasing element to maintain the release valve in the closed position. 2. The filter assembly of claim 1, wherein a spring constant associated with the second biasing element is greater than a spring constant associated with the first biasing element. 3. The filter assembly of claim 1, wherein the base is formed to include an outlet post arranged to extend into the filtered-oil region located in the filter module and formed to include the oil outlet provided in the filter housing and the filter module includes a filter seal arranged to slidably engage the outlet post to establish a sealed connection between the filter module and the outlet post to block flow of oil from the filtered-oil region through the release port via the filter chamber and to maintain the sealed connection during movement of the filter module in the filter chamber relative to the outlet post. 4. The filter assembly of claim 3, wherein the filter seal includes a sleeve arranged to surround and mate with the outlet post and a flange arranged to extend radially outwardly from the sleeve and engage the release valve during movement of the release valve from the opened position to the closed position. 5. The filter assembly of claim 3, wherein the base is also formed to include a release valve channel having an inlet opening at one end communicating with the filter chamber and an outlet opening at an opposite end communicating with the release port, the release valve is mounted for movement in the release valve channel between the opened position and the closed position, and the first biasing element is located in the release valve chamber and arranged to remain therein during movement of the release valve between the opened position and the closed position. 6. The filter assembly of claim 5, wherein the release valve includes a body arranged to engage the first biasing element and a valve head coupled to the body and arranged to extend into the filter chamber during movement of the release valve between the opened position and the closed position. 7. The filter assembly of claim 1, wherein the base is also formed to include a release valve channel having an inlet opening at one end communicating with the filter chamber and an outlet opening at an opposite end communicating with the release port, the release valve is mounted for movement in the release valve channel between the opened position and the closed position, and the first biasing element is located in the release valve chamber and arranged to remain therein during movement of the release valve between the opened position and the closed position. 8. The filter assembly of claim 1, wherein the release valve includes a body arranged to engage the first biasing element and a valve head coupled to the body and arranged to extend into the filter chamber during movement of the release valve between the opened position and the closed position. 9. The filter assembly of claim 8, wherein the filter module includes a filter seal arranged to engage the valve head during movement of the release valve between the opened position and the closed position. 10. The filter assembly of claim 1, wherein the base includes a bottom wall formed to include the release port and an annular side wall extending from the bottom wall toward the cover, the cover includes a top wall and a side wall extending from the top wall toward the bottom wall of the base, the side wall of the base threadedly engages the side wall of the cover to provide means for separating the cover from the base only after rotational movement of the cover about a central axis relative to the base and a predetermined amount of axial movement of the cover along the central axis relative to the base so that the release valve will move away from the closed position under a force generated by the first biasing element to cause oil in the filter chamber to begin to drain from the filter chamber past the release valve through the release port following rotational and axial movement of the cover relative to the base before separation of the cover from the base. 11. The filter assembly of claim 1, wherein the removable cover includes a top wall, a side wall coupled to the top wall and to the base, and an engagement plug appended to the top wall and positioned to lie in the filter chamber to mate with the filter module, and the second biasing element is arranged to extend into an annular space located between the engagement plug and a portion of the top wall of the removable cover. 12. The filter assembly of claim 11, wherein the filter module includes a plurality of flexible fingers that are arranged to surround a distal portion of the engagement plug and mate with channels formed in the distal portion of the engagement plug. 13. The filter assembly of claim 12, wherein the filter module further includes a filter element arranged to engage the release valve and formed to include the exterior portion and the interior portion, the filter module further includes a center tube arranged to extend into the filtered-oil region, the filter element is coupled to the center tube to move therewith, and the plurality of flexible fingers are coupled to the center tube to move therewith. 14. The filter assembly of claim 1, wherein the filter module further includes a filter element arranged to engage the release valve and formed to include the exterior portion and the interior portion and the filter module further includes a center tube arranged to extend into the filtered-oil region and coupled to the removable cover. 15. The filter assembly of claim 14, wherein the base is formed to include an outlet post arranged to extend into the filtered-oil region and into an oilconducting passageway formed in the center tube and the outlet post is formed to include the oil outlet provided in the base. 16. The filter assembly of claim 15, wherein the filter module further includes a filter seal arranged to slidably engage the outlet post to establish a sealed connection between the filter element, the center tube, and the outlet post to block flow of oil from the oil-conducting passageway formed in the center tube through the release port via the filter chamber. 17. An oil filter assembly comprising a filter housing base adapted to be mounted on an engine, the filter housing including a bottom wall and an annular side wall appended to the bottom wall to define a filter-receiving space therebetween, the bottom wall being formed to include a release port located to drain oil from the filter-receiving space, a release valve mounted for movement relative to the base between an opened position allowing flow of oil from the filter-receiving space and a closed position blocking flow of oil from the filter-receiving space through the release port, a first biasing element arranged to move the release valve relative to the base normally to the opened position, and valve actuator means for moving the release valve relative to the base against the first biasing element to the closed position normally to block flow of oil from the filter-receiving space through the release port, the valve actuator means being mounted for movement on the annular side wall of the base to cause the release valve to move under a biasing force generated by the first biasing element from the closed position toward the opened position to drain oil from the filter receiving space through the release port in response to movement of the valve actuator means away from the bottom wall of the base. 18. The filter assembly of claim 17, wherein the valve actuator means includes a filter module arranged to extend into the filter-receiving space to contact the release valve, the filter module includes an exterior portion located in the filter-receiving space to contact oil admitted into the filter-receiving space through an oil inlet provided in the base, and the filter module is formed to include an interior portion defining a filtered-oil region located in the filter module to receive oil that has passed through the filter module from the exterior portion to the interior portion and arranged to discharge oil from the filter-receiving space through an oil outlet provided in the base. 19. The filter assembly of claim 18, wherein the valve actuator means further includes a cover threadedly coupled to the annular side wall and a second biasing element positioned to lie in a space between the cover and the filter module and arranged to urge the fil