Transmission oil filter assembly

Abstract

A transmission filter includes two outlets. One outlet, adapted to feed an engine-driven pump, protrudes diagonally from the front of the filter. The first outlet is sealed to the inlet of the engine-driven pump by a radial seal. The second outlet is arranged in a rear extension and is sealed to the inlet of an electric pump by a compression seal. The differing types of seals and relative orientations of the outlets make the assembly less sensitive to dimension variation due to production and assembly tolerances. The relative locations of the outlets also mitigate any flow interactions between the pumps when both operate simultaneously.

1 . A filter assembly comprising:
 a main body adapted to fit into a transmission sump, containing filter media, and having a bottom surface defining an inlet;   a rear extension extending from the main body and having a top surface defining a rear outlet hole; and   a front outlet tube projecting from a front of the main body and configured to slide into a pump inlet tube at an angle that is not perpendicular to a plane of the rear outlet hole.   
     
     
         2 . The filter assembly of  claim 1  wherein the rear extension further defines two mounting holes. 
     
     
         3 . The filter assembly of  claim 2  wherein a center of the rear outlet hole is between centers of the two mounting holes. 
     
     
         4 . The filter assembly of  claim 1  further comprising a compression seal surrounding the rear outlet hole. 
     
     
         5 . The filter assembly of  claim 1  further comprising a radial seal around the front outlet tube. 
     
     
         6 . A method of assembling a transmission comprising:
 installing first and second pumps each having first and second inlets respectively;   sealing a first outlet of a filter to the first inlet using a radial seal;   positioning a second outlet of the filter adjacent to the second inlet; and   bolting the filter to the second pump to compress a seal between the filter and the second inlet.   
     
     
         7 . The method of  claim 6  wherein positioning the second outlet of the filter adjacent to the second inlet comprises moving the filter parallel to an axis of an inlet tube of the first pump and diagonally with respect to an inlet of the second pump. 
     
     
         8 . The method of  claim 6  wherein installing the first pump comprises fastening the first pump directly to a transmission case. 
     
     
         9 . The method of  claim 8  wherein installing the second pump comprises fastening the second pump directly to the transmission case. 
     
     
         10 . The method of  claim 6  wherein the first pump is an engine driven pump. 
     
     
         11 . The method of  claim 10  wherein the second pump is an electric pump. 
     
     
         12 . A transmission comprising:
 a filter having a bottom surface defining a filter inlet, a top surface defining a rear outlet hole, and a front outlet tube projecting from a front end at an oblique angle relative to the top surface;   a first pump having a first inlet sealed to the front outlet tube by a radial seal; and   a second pump having a second inlet sealed to the top surface around the rear outlet hole by a compression seal wherein the first inlet is not parallel to the second inlet.   
     
     
         13 . The transmission of  claim 12  wherein the first pump is an engine driven pump. 
     
     
         14 . The transmission of  claim 12  wherein the second pump is an electric pump.