Engine valve train with inner and outer cam followers
This patent describes a valve train for an internal combustion engine of the type having an engine block means including a cylinder and with a cylinder head defining two inlet ports and two exhaust ports for the cylinder, a valve reciprocably located in each of the inlet ports and the exhaust ports with the two valves associated with the inlet ports alternating with the two valves associated with the exhaust ports, with all the valves being arranged in a splayed configuration. The engine block means further include an upper support member fixed to the cylinder head, an engine driven camshaft operatively mounted in the engine block means and having a pair of axially spaced apart exhaust cams thereof and an inlet cam thereon located between the exhaust cams, rocker arms each operatively associated at one end thereof with an associate one of the valves, a stepped bore in the cylinder head and upper support means formed at right angles to the cams on the camshaft and above the cams, plural means each defining a rocking support intermediate the ends of an associate one of the valves, and a tubular inner inlet lifter and a tubular outer lifter reciprocably journaled in the stepped bore with the inner lifter engaging the inlet cam and being operative to engage the opposite end of each one of the rocker arm associated with the inlet valves. The outer lifter engages the exhaust cams and is operative to engage the opposite end of each one of the rocker arms associated with the exhaust valves, the axis of reciprocation of the inner and outer lifters being located on the intersection of two imaginary planes extending through the axis of reciprocation of opposed sets of the valves.
- Assignee:
- General Motors Corp., Detroit, MI
- Patent Number(s):
- US 4741301
- OSTI ID:
- 7224612
- Resource Relation:
- Patent File Date: Filed date 28 Nov 1986
- Country of Publication:
- United States
- Language:
- English
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