PURPOSE: To provide a forced lubrication system in which oil of sufficient pressure and quantity for lubricating respective engaged parts can be supplied and the construction is simple and profitable in cost, in combination consisting of a sprocket chain, a sprocket wheel, and a PTO pump driven at high speed and high power. ;CONSTITUTION: A center hollow part 13 is provided on the axis of a sprocket wheel 3 which is spline-fitted to the shaft of a PTO pump 4 and drives the PTO pump by chain drive. A plurality of oil passages 14 communicated to the engaging part of the sprocket wheel 3 with the sprocket chain 2 are formed radially from the center hollow part 13, and an oil jet port 9 to supply oil into the center hollow part 13 is arranged on the end part 131 of the axis of the center hollow part 13.;COPYRIGHT: (C)1993,JPO&Japio
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