The apparatus 1, wherein {HEAD ~ the gear} and the balance shaft comprise {TAIL ~ cast iron}, which has a phosphorous component of at most 0.03 mass percent 
comprise
The apparatus 1 , wherein { HEAD ~ the gear } and the balance shaft comprise { TAIL ~ cast iron } , which has a phosphorous component of at most 0.03 mass percent
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH