Hydraulic cam follower
AssigneeSchaeffler Technologies AG & Co. KG
InventorsFlorin Bugescu, Richard Best
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AssigneeSchaeffler Technologies AG & Co. KG
InventorsFlorin Bugescu, Richard Best
Estimating the term…
A hydraulic cam follower for simultaneous actuation of several equal-acting gas-exchange valves, especially for a tappet pushrod valve train of an engine, includes an outer part, whose base forms a cam contacting surface, and from whose head hollow-cylindrical guides extend in the same number as the valves in a direction towards the base. A housing of a hydraulic play compensation element is provided in each guide and sits with its bottom side on an inside of the bottom of the outer part. A concentric pressure piston is guided in a borehole starting from a head end of each housing so it can move axially. A non-return valve is located at a bottom-side base of the piston and a high-pressure space is formed axially between the base and the bottom side of the housing. A reservoir for hydraulic medium is formed between the base and a head end of the piston.
A hydraulic cam follower for the simultaneous actuation of several equal-acting gas exchange valves for a tappet pushrod valve train of an internal combustion engine, the cam follower comprising an outer part, having a bottom that forms or is at least indirectly connected to a cam contacting surface, and hollow cylindrical round broached or round reamed guides extend from a head of the outer part, in a number equal to a number of the equal-actuated gas exchange valves, in a direction toward the bottom, wherein in each of the hollow cylindrical guides a housing of a hydraulic play equalization element is provided with fine machined, ground outer casing that sits with a bottom side thereof on an inner side of the bottom of the outer part, wherein a concentric pressure piston is guided in a borehole of each of the housings starting from a head-side end of each of the housings and the concentric pressure piston is arranged so that it can move axially via an outer casing thereof, a non-return valve is provided at a bottom-side base of the concentric pressure piston, and a high-pressure space is provided axially between the bottom-side base and a bottom side of the housing, and a reservoir for hydraulic medium is formed between the bottom-side base and a head-side end of the pressure piston.
Dependencies are inferred from the claim text.