| 摘要 |
A hydraulic cam follower ( 1 ) for the simultaneous actuation of several equal-acting gas-exchange valves is provided, especially for a tappet pushrod valve train of an internal combustion engine, and includes an outer part ( 2 ), whose base ( 3 ) forms or is at least indirectly connected to a cam contacting surface ( 4 ) and from whose head ( 5 ) hollow-cylindrical guides ( 6 ) extend in the same number as the equal-acting gas-exchange valves in a direction towards the base ( 3 ). Each guide ( 6 ) is formed by a cutting process, such as internal round reaming or internal round broaching, and a housing ( 7 ) of a hydraulic play compensation element ( 8 ) is provided in each guide with its outer casing ( 9 ) fine-machined by grinding, which housing ( 7 ) sits with its bottom side ( 10 ) on an inner side ( 11 ) of the bottom ( 3 ) of the outer part ( 2 ). A concentric pressure piston ( 14 ) is guided in a borehole ( 13 ) fine-machined by grinding starting from a head end ( 12 ) of each housing ( 7 ) with its outer casing ( 15 ), which is also fine-machined by grinding, so that it can move axially. A non-return valve ( 17 ) is located at a bottom-side base ( 16 ) of the pressure piston ( 14 ), and a high-pressure space ( 18 ) is formed axially between the base ( 16 ) and the bottom side ( 10 ) of the housing ( 7 ). A reservoir ( 20 ) for hydraulic medium is formed between the base ( 16 ) and a head end ( 19 ) of the pressure piston (14).
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