초록 ▼

A hydraulic coupling device includes left and right vane pumps which discharge working oil in response to the relative rotation of main driven wheels and left and right subsidiary driven wheels. First orifices are defined in a side plate disposed between the left and right vane pumps to permit commu

A hydraulic coupling device includes left and right vane pumps which discharge working oil in response to the relative rotation of main driven wheels and left and right subsidiary driven wheels. First orifices are defined in a side plate disposed between the left and right vane pumps to permit communication between intake ports and discharge ports in the vane pumps. Orifices are defined in the side plate to permit communication between the intake ports and between the discharge ports in the vane pumps. With the above arrangement, in a hydraulic coupling device of a power transmitting system in a four-wheel drive vehicle, the formation of the orifices can be easily carried out, and the characteristics of the orifices can be stabilized.

대표청구항 ▼

[ What is claimed is:] [1.]1. A power transmitting system in a four-wheel drive vehicle having an engine, left and right main driven wheels and left and right subsidiary driven wheels, comprising an input shaft driven by the engine and coupled to the left and right main driven wheels, a left drive s

[ What is claimed is:] [1.]1. A power transmitting system in a four-wheel drive vehicle having an engine, left and right main driven wheels and left and right subsidiary driven wheels, comprising an input shaft driven by the engine and coupled to the left and right main driven wheels, a left drive shaft coupled to the left subsidiary driven wheel, a right drive shaft coupled to the right subsidiary driven wheel, a left vane pump having an intake port and a discharge port, operated in accordance with a difference between numbers of rotation of said input shaft and said left drive shaft, a right vane pump having an intake port and a discharge port, operated in accordance with a difference between numbers of rotation of said input shaft and said right drive shaft, said left and right vane pumps positioned between said left and right subsidiary driven wheels, left first orifice positioned between said intake port and said discharge port in said left vane pump, a right first orifice positioned between said intake port and said discharge port in said right vane pump, an intake second orifice positioned between said intake port in said left vane pump and said intake port in said right vane pump, a discharge second orifice positioned between said discharge port in said left vane pump, and said discharge port in said right vane pump, a cam ring, and a side plate, wherein each of said vane pumps includes a plurality of vanes and a rotor accommodated in a space surrounded by said cam ring and said side plate, said plurality of vanes radially, slidably carried on the rotor are in sliding contact at outer ends thereof with said cam ring, and wherein said left and right first orifices communicate between said left and right intake ports and said left and right discharge ports respectively and are formed in said side plate of the vane pumps.