Engine camshaft and accessory drive

Claim 2

An internal combustion engine of the type having a cylinder block mounting a crankshaft and an overhead camshaft for rotation on coplanar axes, said block containing a coolant cavity for the circulation of cooling fluid therethrough, said engine including a toothed pulley mounted on said crankshaft at one end of said block a second toothed pulley mounted on said camshaft and aligned with said first toothed pulley, a water pump mounted on said one end of said block and arranged to deliver cooling fluid into said coolant cavity, said water pump having a drive pulley including a plurality of annular ridges and grooves and disposed generally intermediate and in alignment with said first and second toothed pulleys, the position on said block of said water pump and grooved pulley being adjustable to a limited extend in a direction generally transverse to the plane of said crankshaft and camshaft axes and a drive belt having a toothed interior surface in driving engagemenT with said first and second toothed pulleys and an exterior surface having longitudinal ridges and grooves mating with the ridges and grooves of said water pump drive pulley and in driving engagement therewith, whereby said camshaft is positively driven by said drive belt, said water pump is nonpositively driven by said drive belt and the tension on said belt may be adjusted by lateral adjustment of the position of said water pump on said block.

Claim 3

An internal combustion engine of the type having a cylinder block mounting a crankshaft and an overhead camshaft for rotation on coplanar axes, said block including a coolant cavity for the circulation of cooling liquid therethrough, said engine including a first toothed pulley mounted on said crankshaft at one end of said block, a second toothed pulley mounted on said camshaft and aligned with said first toothed pulley, a water pump mounted on said one end of said block and having an impeller extending into said coolant cavity, said impeller being arranged to deliver cooling fluid directly into said coolant cavity, the position of said water pump on said block being adjustable to a limited extent in a direction generally transverse to the plane of said crankshaft and camshaft axes, clearance being provided within said cylinder block for the necessary lateral movement of said impeller on account of such adjustment, a drive pulley carried on said water pump and drivably connected with said impeller, said drive pulley having a plurality of annular ridges and grooves and being disposed generally intermediate and in alignment with said first and second toothed pulleys, a fan drivably secured to said drive pulley for rotation therewith, and a drive belt having a toothed interior surface in driving engagement with said first and second toothed pulleys and an exterior surface having longitudinal ridges and grooves mating with the ridges and grooves of said water pump and fan drive pulley and in driving engagement therewith, whereby said camshaft is positively driven by said drive belt, said water pump and fan are nonpositively driven by said drive belt and the tension on said drive belt may be adjusted by lateral adjustment of the position of said water pump on said block.

Claim 4

An internal combustion engine of the type having a cylinder block mounting a crankshaft and an overhead camshaft for rotation on coplanar axes, said block including a coolant cavity for the circulation of cooling liquid therethrough, said engine including a first toothed pulley mounted on said crankshaft at one end of said block, a second toothed pulley mounted on said camshaft and aligned with said first toothed pulley, a water pump mounted on said one end of said block and having an impeller extending into said coolant cavity, said impeller being arranged to deliver cooling fluid directly into said coolant cavity, the position of said water pump on said block being adjustable to a limited extent in a direction generally transverse to the plane of said crankshaft and camshaft axes, clearance being provided within said cylinder block for the necessary lateral movement of said impeller on account of such adjustment, a drive pulley carried on said water pump and drivably connected with said impeller, said drive pulley having a plurality of annular ridges and grooves and being disposed generally intermediate and in alignment with said first and second toothed pulleys, a fan drivably secured to said drive pulley for rotation therewith, and a drive belt having a toothed interior surface in driving engagement with said first and second toothed pulleys and an exterior surface having longitudinal ridges and grooves mating with the ridges and grooves of said water pump and fan drive pulley and in driving engagement therewith, whereby said camshaft is positively driven by said drive belt, said water pump and fan are nonpositively driven by said drive belt and the tension on said drive belt may be adjusted by lateral adjustment of the position of said water pump on said block.