摘要 |
A hydraulic cam follower ( 1 ), such as a roller tappet, is provided. This is used for the actuation of two identically operating gas-exchange valves and should be installed inclined to the direction of the force of gravity. The cam follower ( 1 ) comprises a pot-shaped housing ( 2 ), whose bottom ( 3 ) is provided with a roller as a cam contacting element ( 4 ). In the housing ( 2 ), two guides ( 5 ) extending parallel to the direction of the internal combustion engine are provided, in each of which a pressure piston ( 6 ) is arranged so that it can move axially, whose end ( 7 ) away from the housing is constructed as a support for contact with a respective tappet pushrod. Each pressure piston ( 6 ) encloses a reservoir ( 11 ) for hydraulic medium. For each pressure piston ( 6 ), an opening ( 13 ) extends from the outer casing ( 12 ) of the housing ( 2 ) for feeding hydraulic medium to the reservoirs ( 11 ), wherein the openings ( 13 ) are arranged on a peripheral segment of the outer casing ( 12 ) lying at the top viewed in the direction of the force of gravity. Thus, a so-called double roller tappet is provided as a cam follower ( 1 ), which can store a sufficiently large amount of hydraulic medium despite its inclined installation.
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