Compact crank drive mechanism with guided pistons
This patent describes an improved engine of the type having at least two pistons which reciprocate with a desired phase difference in two adjacent cylinders in a housing and having a crankshaft linked to the pistons by a crank drive mechanism formed by a yoke and a rocking lever. The yoke has a central pair of pivot axes and a pair of laterally distal pivot axes spaced on opposite sides of the central axes and each connected by a connecting rod to a different one of the pistons. One of the cental pivot axes is rotatably attached to a throw of the crankshaft. The rocking lever is pivotally attached to one end to the second central pivot axis of the yoke and extending laterally into pivotal attachment with the housing wherein the improvement comprises: (a) a first one of the pistons having a rigidly attached piston rod to form a first rocker piston which is pivotally connected to the yoke distal pivot axis which is laterally opposite the rocking lever, the first piston having a portion extending substantially into its cylinder, and (b) the second piston having a rocker piston having rigidly attached piston rod pivotally attached to the other yoke distal pivot axis.
- Assignee:
- NOV; NOV-88-016058; EDB-88-130661
- Patent Number(s):
- US 4738105
- OSTI ID:
- 7224481
- Country of Publication:
- United States
- Language:
- English
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