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An automatic hand held transmission fluid changer includes a compact housing internally plumbed with a pair of open ended drain and supply tubes for connection at respective first ends with a pair of hoses connected at their respective opposite ends to remote waste and unused fluid tanks. The respec

An automatic hand held transmission fluid changer includes a compact housing internally plumbed with a pair of open ended drain and supply tubes for connection at respective first ends with a pair of hoses connected at their respective opposite ends to remote waste and unused fluid tanks. The respective tubes include second ends for connection with a second pair of hoses leading to respective upstream and downstream transmission components for, respectively, withdrawing used fluid from and introducing unused fluid to a transmission. A demand pump is connected in fluid circuit with the supply hose to flow unused fluid from the unused fluid tank to the supply tube. A controller is provided and acts to receive an electric signal proportional to the rate of fluid flow from a flow meter in the drain tube and to manipulate a control valve in the supply tube such that an automatic balancing of flow rates is achieved.

대표청구항 ▼

[ What is claimed is:] [1.] In a transmission fluid changing system having a pressurized unused fluid supply hose, a disposal hose, an unused fluid hose, a used fluid hose, a supply tank and a drain tank, a portable, automatic hand held controller apparatus comprising:a hand held, portable housing f

[ What is claimed is:] [1.] In a transmission fluid changing system having a pressurized unused fluid supply hose, a disposal hose, an unused fluid hose, a used fluid hose, a supply tank and a drain tank, a portable, automatic hand held controller apparatus comprising:a hand held, portable housing formed with oppositely disposed end walls, an interior compartment, a pair of exterior hand holds for being grasped by an operator to be carried thereby and manipulated about, and a pair of elongated, laterally spaced apart openings defining respective windows;coextensive, rigid supply and drain tubes housed in said compartment and projecting at their respective opposite ends outwardly through the respective said end walls to project from said housing to form, at the respective opposite ends thereof, a supply tube inlet and outlet and a drain tube inlet and outlet;respective supply inlet and outlet couplings at the respective said supply tube inlet and outlet and disposed exterior to the respective said end walls for connection, respectively, with said supply hose and said unused fluid hose;respective drain inlet and outlet couplings at the respective said drain tube inlet and outlet and disposed exterior to said housing for connection, respectively, with said used fluid hose and said disposal hose;respective drain and supply flow meters in the respective said drain and supply tubes for sensing the fluid flow rates through the respective said drain and supply tubes and generating respective electrical supply and drain flow signals corresponding to the respective flow rates;a pair of display devices mounted on said housing and electrically connected to the respective said flow meters for displaying the flow rates through the respective said drain and supply tubes;a pressure sensor and gauge mounted in said housing and connected to said drain tube for sensing and displaying the pressure in said drain tube;a pair of sight glasses in the respective said drain and supply tubes and disposed in confronting relation with the respective said windows in said housing;a control valve in said supply tube including an electrical operator; anda controller electrically coupled with said drain flow meter and said electrical operator and responsive to said electrical drain flow signal to control said control valve in said supply tube to maintain the flow rate therethrough substantially equal to the flow rate in said drain tube as sensed by said drain flow meter, whereby said housing may be grasped by said hand holds to be held by the operator and said supply inlet coupling connected to one end of said pressurized unused fluid supply hose and the other end of said pressurized unused fluid supply hose connected to said supply tank, said supply outlet coupling connected to one end of said unused fluid hose and the other end of said unused fluid hose connected to a first transmission fluid port, said drain inlet coupling connected to one end of said used fluid hose and the other end of said used fluid hose connected to a second transmission fluid port, and said drain outlet coupling connected to one end of said disposal hose and the other end of said disposal hose connected to said drain tank to flow unused fluid from said supply tank through said pressurized unused fluid supply hose, supply tube and unused fluid hose to said first transmission fluid port and flow used fluid from said second transmission fluid port through said used fluid hose, drain tube and disposal hose to said drain tank, while said controller receives said electrical flow signals from said drain flow meter and is responsive to said flow signals to manipulate said control valve accordingly to maintain substantially equal flow rates through said drain and supply tubes.