wherein said transmission cover member extends to enclose said reduction gear means to form {HEAD ~ a wet type chamber} to hold {TAIL ~ a lubricant} to immerse said reduction gear means; and 
wherein said transmission cover member extends to enclose said reduction gear means to form { HEAD ~ a wet type chamber } to hold { TAIL ~ a lubricant } to immerse said reduction gear means ; and
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH