Patent ID: 6447565
Filing Date: 2002-09-10
Classification: F16H,Y10T

Abstract:
A transmission vent assembly for venting a vehicular transmission comprising:a vent apparatus having a cylindrical tube portion received in a mounting hole of a transmission housing, a vent body portion integral and adjacent to said tube portion and having an exterior cylindrical surface of greater diameter than said tube portion, and a central bore defining an internal passage extending through a lower end of said tube to an upper surface of said vent body, said central bore having a larger diameter portion defining an open ended pocket formed in said upper surface of said vent body; a filter disposed in said open ended pocket to capture and condense fluid vapor and return fluid to said transmission through said internal passage; said vent body including a shoulder about said exterior cylindrical surface adjacent said upper surface and a double lead thread about said exterior cylindrical surface initiating at said shoulder and terminating at a lower end of said vent body; said transmission vent assembly further comprising a cap, formed in a cup-shape and press fittingly disposed over said vent body, and having a closed end seated on said upper surface of said vent body and a cylindrical wall extending therefrom about said exterior cylindrical surface of said vent body, said cap and said shoulder cooperate to form an annular air cavity and said cap and said double lead thread cooperate to define a first and a second threaded passage, said cap further including an outward impression in said closed end which cooperates with said upper surface of said vent body to define a connecting air passage; and two bidirectional air flow paths extending between said transmission and the atmosphere through said internal passage, said connecting air passage, said annular air cavity, and each of said two threaded passages, for equalizing pressure in said transmission to the atmosphere.