Discharge control apparatus of hydraulic pump for automatic transmission
AssigneeFuji Jukogyo Kabushiki Kaisha
InventorToshio Kobayashi
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Abstract
In an automatic transmission, the amount of transmission fluid discharged is controlled by a flow control valve. A fixed displacement type pump is connected with a bypass passage through which a part of fluid discharged from a discharge port of the pump flows back to a suction port of the pump. A flow control valve is provided in the bypass passage so as to regulate the amount of discharged fluid at an approximate equal level according to a feedback pressure generated in a pressure regulating valve.
Claims4
A control system of a hydraulic pump for an automatic transmission having an engine connected to said automatic transmission for transmitting power and for directly driving said hydraulic pump, a transmission case entirely enclosing said automatic transmission, a pump cover connected to said transmission case for covering said hydraulic pump, a wall section provided in front of said hydraulic pump for covering thereof, and a pressure regulating valve operatively connected to a delivery port of said hydraulic pump for controlling a line pressure of said control system, comprising:
- a flow control valve included in said pump cover and operatively connected between said hydraulic pump and said pressure regulating valve for controlling a supply of hydraulic oil to said control system;
- an oil passage formed in said wall section for communicating between an oil chamber of said flow control valve and a feedback pressure port of said pressure regulating valve for urging an end of said flow control valve to be displaced by a feedback pressure;
- and
- a bypass passage formed in said wall section for communicating between said delivery port and a first port of said flow control valve;
- wherein
- said flow control valve accurately regulates a delivery pressure in accordance with said feedback pressure so as to effectively economize fuel consumption in a rigid compact configuration.
Dependencies are inferred from the claim text.