Overhead camshaft

Abstract: An in-line type multi-cylinder, double overhead cam, internal combustion engine having a balancer shaft arrangement that is driven directly off the crankshaft at a point intermediate of the ends of the crankshaft. To permit a more compact engine assembly, the balancer shaft also functions as an accessory drive shaft for driving a number of accessories including the camshafts of the engine.

Abstract: A number of embodiments of double overhead cam shaft V type engines wherein the drive arrangement for the camshafts permits not only a compact design but also one in which the timing loadings are decreased to improve engine life, performance and reduced servicing.

Abstract: PURPOSE:To reduce the size and cost of a cylinder head, by providing sprockets on cam shafts for an intake and an exhaust valves so that the sprockets are partially juxtaposed in the axial direction of the shafts and by engaging twin chains with the sprockets to drive them. CONSTITUTION:In an engine of double overhead cam type, the distance between a first cam shaft 2 for an intake valve 1 and a second cam shaft 4 for an exhaust valve 3 is reduced and sprockets 5, 6 on the cam shafts are partially juxtaposed. Twin sprockets 8 are secured on a crankshaft 7. Twin chains 9 are engaged with eh sprockets 8 and the sprockets 5, 6 respectively. According to this constitution, by cylinder head of the engine is made compact. Since the cam shafts 2, 4 are driven through the twin chains 9, the intake valve 1 and the exhaust valve 3 are kept from becoming asynchronous to each other in opening and closing.

Abstract: PURPOSE:To shorten the overall width of a valve operating mechanism, by setting up an end pivot of a rocker arm in the central part of a cylinder head. CONSTITUTION:Each of end pivots 25 and 26 supporting rocker arms 30 and 31 used for a suction valve 11 and an exhaust valve 12 is set up in the central part of a cylinder head 14. Each of these rocker arms 30 and 31 is rocked by cam shafts 28 and 29. Comparing such a case that these end pivots are set up outside the valve, width L2 comes small so that a valve operating mechanism and the cylinder head both also come compact in size.