VISCOUS DAMPER ATTACHMENT STRUCTURE FOR SUPPLY PUMP OF COMMON RAIL FUEL INJECTION DEVICE

A viscous damper mounting structure for a supply pump of a common-rail fuel injection device that can minimize shape modifications on the engine side and changes in the supply pump shape or the like, enables the installation of a damper device on the drive shaft of a supply pump, and reduces the drive noise of the supply pump. The mounting structure includes a supply pump 2 that supplies a high-pressure fuel into an accumulator 3 of the common-rail fuel injection device, a supply pump gear 22 that is fixed by a fastening member to a supply pump camshaft 21 that drives the supply pump 2 via a gear train fitted with the supply pump 2 and connected to a crankshaft, a viscous damper 5 that inhibits rotation fluctuations of the supply pump gear 22, and a damper adapter 6 interposed between the viscous damper 5 and the supply pump gear 22.