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