Patent ID: 7163481

Claim:
A driving force transmitting system for a motor vehicle having an idling-stop system, comprising: a mechanical oil pump to be driven by an internal combustion engine and operatively connected to an automatic transmission device for supplying working fluid to the automatic transmission device; an electric oil pump to be driven by an electric motor and operatively connected to the automatic transmission device for supplying working fluid to the automatic transmission device, wherein the electric oil pump is provided in parallel with the mechanical oil pump; a forward movement clutch operatively connected between the internal combustion engine and the automatic transmission device for transmitting a driving force of the internal combustion engine to the automatic transmission device when the forward movement clutch is mechanically coupled by operation of the working fluid; a first valve provided in a first passage connecting the mechanical oil pump with the forward movement clutch at an output side of the mechanical oil pump for opening the first passage so that the working fluid discharged from the mechanical oil pump may flow to the forward movement clutch and for closing the first passage so that the working fluid is prevented from flowing from the forward movement clutch to the mechanical oil pump; a manual valve operatively linked with a shift lever of the motor vehicle and provided in the first passage between the first valve and the forward movement clutch for controlling the flow of the working fluid depending on a position of the shift lever; an oil circuit branching off from the first passage at a point between the mechanical oil pump and the first valve, so that the working fluid discharged from the mechanical oil pump flows into the oil circuit; and an oil pressure control device for controlling oil pressure of the working fluid to be supplied to the automatic transmission device, wherein the working fluid flows into the oil pressure control device through the manual valve, wherein an output side of the electric oil pump is operatively connected to the first passage at a jointing point between the first valve and the manual valve so that the electric oil pump is connected to the forward movement clutch through the manual valve, wherein the idling-stop system actuates the electronic oil pump to operate during idling-stop of the internal combustion engine, so that the working fluid is supplied from the electric oil pump to the forward movement clutch to engage the forward movement clutch during said idling-stop of the internal combustion engine.