Patent ID: 6027646
Filing Date: 2000-02-22
Classification: B01D,F01M

Abstract:
A canister oil filter for an internal combustion engine comprising a tubular housing having a central axis, a head having an inlet duct for incoming unfiltered oil and an outlet duct for filtered oil disposed on an upper end of the tubular housing and a removable cover disposed on a lower end of the tubular housing, an adapter plate with a boss disposed adjacent the head with the boss extending into the housing, the boss having a counterbore generally concentric with the axis of the tubular housing, an outlet port disposed in a bottom portion of the counterbore registering with the outlet duct in the head and an inlet port disposed outside of the boss registering with the inlet duct in the head, a retainer collar slidably disposed in the counterbore, a groove is disposed in the counterbore and cooperates with a retaining ring extending from the retainer collar to capture the retainer collar within the counterbore and allow the retainer collar to slide back and forth in the counterbore, a spring disposed in the counterbore biases the retainer collar away from the bottom portion of the counterbore, the cover having a fixed collar disposed concentric with the tubular housing, a plurality of cylindrical filter elements having sealed ends with a central opening in each sealed end and an elastomer seal circumscribing each of the central opening, the filter elements being stacked within the housing with the elastomer seals of adjacent filter elements abutting, the elastomer seal on the filter element adjacent the retainer collar abuts the retainer collar, the elastomer seal on the end of the filter element adjacent the cover fits over the fixed collar and abuts the cover, the stack of filter elements having a length that is greater than a distance between the cover and the retainer collar thereby compressing all of the elastomer seals and the spring and forcing the unfiltered oil to pass through the filter elements before reaching the outlet duct even when high pressure spikes during engine start-up cause surges of high pressure incoming oil to impinge on the filter element adjacent the inlet port as the bias of the spring on the retainer collar and the force from the impinging incoming oil are generally in the same direction.