Pushrod engine with multiple independent lash adjusters for each pushrod
First Claim
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1. A valvetrain for a multiple-cylinder internal combustion engine having a camshaft disposed within an engine block for operating two valves from a single camshaft lobe, the valvetrain comprising:
- a lifter having a roller for contacting the camshaft lobe and reciprocating within the engine block in response thereto;
a pushrod engaging the lifter;
a bucket follower engaging the pushrod and reciprocating within a corresponding bore in response thereto, the bucket follower including first and second hydraulic lash adjusters; and
first and second rocker arms each associated with a respective one of the first and second hydraulic lash adjusters and a respective one of the two valves.
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Abstract
A multiple-cylinder internal combustion engine having a camshaft-driven valvetrain with a camshaft disposed within an engine block includes at least two intake and/or exhaust valves with multiple valves operated by a common lifter and pushrod that engages a follower having multiple independent lash adjusters coupled to associated rocker arms. The lifter contacts the common camshaft lobe and a corresponding pushrod that engages a reciprocating bucket follower with a compliant coupling to corresponding rocker arms.
28 Citations
13 Claims
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1. A valvetrain for a multiple-cylinder internal combustion engine having a camshaft disposed within an engine block for operating two valves from a single camshaft lobe, the valvetrain comprising:
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a lifter having a roller for contacting the camshaft lobe and reciprocating within the engine block in response thereto; a pushrod engaging the lifter; a bucket follower engaging the pushrod and reciprocating within a corresponding bore in response thereto, the bucket follower including first and second hydraulic lash adjusters; and first and second rocker arms each associated with a respective one of the first and second hydraulic lash adjusters and a respective one of the two valves. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for actuating at least two gas exchange valves associated with a single cylinder in a multiple-cylinder internal combustion engine having a camshaft disposed within an engine block, the method comprising:
actuating the at least two gas exchange valves substantially simultaneously using a single lifter and pushrod associated with a follower having at least two corresponding independent lash adjustment mechanisms that engage corresponding rocker arms to actuate the gas exchange valves. - View Dependent Claims (8, 9, 10, 11, 12, 13)
Specification
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Current AssigneeFord Global Technologies, LLC (Ford Motor Company)
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Original AssigneeFord Global Technologies, LLC (Ford Motor Company)
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InventorsDiggs, Matthew
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Primary Examiner(s)Chang; Ching
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Application NumberUS11/539,238Publication NumberTime in Patent Office711 DaysField of Search123/90.16, 123/90.2, 123/90.39, 123/90.41, 123/90.45, 123/90.44, 745/59, 745/67, 745/69US Class Current123/90.41CPC Class CodesF01L 1/14 Tappets hydraulic tappets f...F01L 1/18 Rocking arms or leversF01L 1/181 Centre pivot rocking armsF01L 1/2422 by means or a hydraulic adj...F01L 1/255 between cam and rocker armF01L 1/26 characterised by the provis...F01L 2305/00 Valve arrangements comprisi...Y10T 74/2107 Follower
