50 is dispensed with and the roller 44 is mounted directly via its outer jacket in the recess 66 designed as a half shell the tappet body 42 has in its outer jacket an annular groove 70 which extends in the axial direction for example starting from the bottom region 54 into the jacket region 56 of the tappet body 42 the annular groove 70 is arranged in the axial direction such that it is in overlap with the issue of the feed line 48 of the lubricant into the receptacle 46 constantly that is to say throughout the entire lifting movement of the tappet body 42 and therefore of the pump piston 12 a discharge line 72 for lubricant leads from the annular groove 70 through the tappet body 42 into the recess 66 the discharge line 72 may be formed by at least one bore although a plurality of bores in particular two bores lying diametrically opposite one another may also be provided which in each case issue into the recess 66 in the region of the axial ends of the roller 44 lubricant is thus fed via the discharge line 72 to the mounting of the roller 44 in the tappet body 42 the.