Internal combustion engine with torque converter

An internal combustion engine comprising:

• a torque converter, said torque converter being provided on a crankshaft having an axially extending center hole for supplying hydraulic oil to said torque converter;
• a return oil passage from said torque converter, said return oil passage being in communication with a hydraulic oil return passage formed in said crankshaft so as to extend axially of said crankshaft;
• a chamber, said chamber being defined by a pair of inner and outer oil seals for sealing a bearing mounted on said crankshaft;
• and
• an oil passage, said oil passage being in communication with a crankcase and having a check valve at a downstream end thereof,
• wherein a pipe is inserted in said center hole of said crankshaft to form a hydraulic oil passage leading to said torque converter, said hydraulic oil return passage from said torque converter, and a lubricating oil passage leading to an area surrounding said crankshaft.

An internal combustion engine, comprising:

• a crankshaft, said crankshaft having an axially extending center hole formed therein;
• an inner pipe and an outer pipe inserted into said axially extending center hole;
• and
• a torque converter, said torque converter being provided on said crankshaft;
• wherein a space between said inner pipe and said outer pipe forms a hydraulic oil supply passage to said torque converter.