Transmission Oil Filter Assembly

摘要

A transmission filter assembly utilizes a filter cartridge that slides axially with respect to the filter chamber. In normal operation, a spring pushes the filter cartridge into a position such that fluid flows into the interior of the cartridge, through filter media, and then radially out of the cartridge. If the pressure drop across the filter is excessive, the pressure forces the filter cartridge to slide to a position in which fluid bypasses the filter media. In this bypass mode, fluid does not flow into the interior of the cartridge and therefore has a very low tendency to dislodge previously captured contaminants. Two sets of tabs position the cartridge radially within the chamber. The two sets are separated axially to prevent tilting of the cartridge.

主权项

1. A transmission comprising:
a hydraulic pump configured to draw fluid from a sump and supply the fluid at increased pressure to a pump outlet circuit; a control system configured to route fluid from a line pressure circuit to a plurality of clutches; a housing defining a filter chamber with an inlet port connected to the pump outlet circuit and an outlet port connected to the line pressure circuit; a filter cartridge configured to slide within the filter chamber, the filter cartridge having two sets of tabs spaced axially away from one another and configured to position the filter cartridge radially within the filter chamber while permitting circumferential fluid flow between an exterior surface of the cartridge and an interior surface of the chamber, the filter cartridge containing filter media; and a spring biasing the filter cartridge toward a first position with respect to the filter chamber in which fluid flow from the pump outlet circuit to the line pressure circuit is constrained to pass through the filter media, and wherein a pressure difference between the pump outlet circuit and the line pressure circuit biases the filter cartridge toward a second position in which fluid flow from the pump outlet circuit to the line pressure circuit bypasses the filter media.