Hydraulic cam follower
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Sep 14, 2010
Issued Date -
N/A
app pub date -
Nov 28, 2007
filing date -
Nov 28, 2006
priority date (Note) -
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Abstract
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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