METHODS OF SETTING A TAPPET IN AN ENGINE
First Claim
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1. A method of setting a tappet in an engine, the method comprising:
- setting a crankshaft within a first range of crankshaft rotation angles, wherein a cam coupled to the crankshaft is configured to provide cam lobe lift when the crankshaft is set within the first range of crankshaft rotation angles, and wherein the cam lobe lift translates a tappet screw, coupled to the cam, towards a valve by a distance less than a gap defined between the valve and the tappet screw, wherein the distance corresponds to a predetermined tappet clearance value defined when the crankshaft is set within a second range of crankshaft rotation angles; and
adjusting the tappet screw such that a zero gap tappet clearance is defined between the valve and the tappet screw.
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Abstract
A method of setting a tappet in an engine. The method includes setting a crankshaft at a predetermined crankshaft rotation angle. A cam coupled to the crankshaft is configured to provide cam lobe lift when the crankshaft is set at the predetermined crankshaft rotation angle. The cam lobe lift translates a tappet screw, coupled to the cam, towards a valve by a distance less than a gap defined between the valve and the tappet screw. The method also includes adjusting the tappet screw such that a zero gap tappet clearance is defined between the valve and the tappet screw.
7 Citations
20 Claims
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1. A method of setting a tappet in an engine, the method comprising:
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setting a crankshaft within a first range of crankshaft rotation angles, wherein a cam coupled to the crankshaft is configured to provide cam lobe lift when the crankshaft is set within the first range of crankshaft rotation angles, and wherein the cam lobe lift translates a tappet screw, coupled to the cam, towards a valve by a distance less than a gap defined between the valve and the tappet screw, wherein the distance corresponds to a predetermined tappet clearance value defined when the crankshaft is set within a second range of crankshaft rotation angles; and adjusting the tappet screw such that a zero gap tappet clearance is defined between the valve and the tappet screw. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of setting a tappet in an engine, the method comprising:
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defining a predetermined tappet clearance value; determining a cam profile of a cam as a function of cam lobe lift and camshaft rotation angle; determining a range of target camshaft rotation angles for a camshaft, coupled to the cam, that facilitates producing a cam lobe lift value equal to the predetermined tappet clearance value; and determining a range of crankshaft rotation angles that corresponds to the range of target camshaft rotation angles. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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20. A method of setting a tappet in an engine, the method comprising:
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adjusting a tappet screw coupled to a cam such that a gap defined between a valve and the tappet screw is greater than a predetermined tappet clearance; setting a crankshaft within a first range of crankshaft rotation angles, wherein the cam is coupled to the crankshaft, and the cam is configured to provide cam lobe lift when the crankshaft is set within the range of crankshaft rotation angles, wherein the cam lobe lift translates the tappet screw towards the valve by a distance less than the gap, wherein the distance corresponds to a predetermined tappet clearance value defined when the crankshaft is set within a second range of crankshaft rotation angles; and adjusting the tappet screw such that a zero gap tappet clearance is defined between the valve and the tappet screw, wherein the predetermined tappet clearance is defined between the valve and the tappet screw when the cam does not provide the cam lobe lift.
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Specification