Camshaft support structure

Abstract

Support bases for supporting camshafts in a rotatable manner are mounted on the cylinder head of an internal combustion engine. The support bases are provided so as to be separated from each other in the axial direction of the camshafts. Each of the support bases comprises bearing portions which support the camshafts and a through-hole which extends in the axial direction of the camshafts. A rod is inserted through the through-holes, and the rod restricts the bearing portions from being displaced from positions at which the bearing portions are located while the internal combustion engine is stopped and cold.

1 .- 5 . (canceled) 
     
     
         6 . A camshaft support structure mounted on a cylinder head of an internal combustion engine, the camshaft support structure comprising support bases for supporting both an exhaust camshaft and an intake camshaft to be freely rotational, the structure comprising:
 the support bases are arranged apart from one another in an axial direction of the exhaust camshaft and the intake camshaft;   each support base has bearing portions, which support the exhaust camshaft and the intake camshaft, and a through hole, which is formed closer to the exhaust camshaft than to the intake camshaft and extends in the axial direction; and   the through holes receive a rod, which restricts the bearing portions from being displaced from an arrangement position at which the bearing portions are located when the internal combustion engine is stopped and cold.   
     
     
         7 . The camshaft support structure according to  claim 6 , wherein the rod is made of material having higher rigidity than the support bases. 
     
     
         8 . The camshaft support structure according to  claim 6 , wherein
 each support base includes a receiving member, which is mounted on the cylinder head and receives the exhaust camshaft and the intake camshaft, and cap members, which are mounted on a top surface of the receiving member and form the bearing portions together with the receiving member, and   the through hole is formed in the receiving member.   
     
     
         9 . The camshaft support structure according to  claim 6 , wherein the internal combustion engine includes a forced-induction device.