Oil passage structure of chain-drive oil pump

An oil passage structure of a chain-driven oil pump, the structure being applicable to an automatic transmission device for an automobile in which a torque converter is accommodated in a torque converter housing, and a stator is attached to a stator shaft via a one-way clutch,

• wherein the structure comprises:
• a chain system, on the torque converter side of a center support;
• and
• an oil pump being driven via the chain system,
• the chain system transmitting, via a chain, drive force that has been transmitted to a drive sprocket to a driven sprocket placed in a position separated from the rotational center of the drive sprocket in a radial direction thereof,
• the center support, the chain, and the torque converter being provided sequentially along an axis direction of an input shaft of the torque converter,
• wherein the structure comprises a first oil passage to supply oil from the center support to the torque converter, the oil passage including a communication flow channel passing between an outer periphery surface of the driven sprocket and an outer periphery surface of the drive sprocket when viewed from the radial direction of the drive sprocket, and
• wherein the communication flow channel supplies oil from the center support side to the torque converter side, and
• wherein the communication flow channel passes between a lower end of the driven sprocket and an upper end of the drive sprocket when viewed from the axis direction of the drive sprocket.