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US 3,998,200 AGranted
Reciprocating engine
OwnerKenneth J. Sudholtinventor
Life of this patent
Estimating the term…
Abstract
An engine includes a block having at least one cylinder in which a piston reciprocates. The piston is connected through a piston connecting rod to a lever arm, and the lever arm is in turn connected to the eccentric crank pin of a crankshaft through a crank connecting rod. The lever arm is positioned and moved not only by the piston and crankshaft, but also by a positioning cam which bears against one end of the arm. The arrangement is such that throughout the entire power stroke the force transmitted to the crankshaft is applied through a relatively large moment arm, thus providing greater torque for the engine. The arrangement results in a relatively large angle between the crank connecting rod and the crank arm and permits greater eccentricity on the crank arm.
Claims8
An engine comprising:
- a block having at least one cylinder;
- a piston movable axially in the cylinder through a power stroke and other strokes;
- a crankshaft rotatable in the block;
- linkage means between piston and the crankshaft for coupling the two together such that crankshaft rotates in a predetermined relation to the axial reciprocating movement of the piston in the cylinder, the linkage means including a lever arm, a piston connecting rod extended between the piston and the lever arm and being pivotally connected to the lever arm, and a crank connecting rod pivotally connected to the lever arm and to the crankshaft in offset relation to the axes of rotation thereof;
- and positioning means acting on the lever arm of the linkage means to position the linkage means such that a full stroke of the piston is translated into less than 180.degree. of rotational movement for the crankshaft, the positioning means including a cam which rotates in predetermined relation to the crankshaft and bears against the lever arm beyond the location where the connecting rod is pivotally connected to the lever arm and such that the connecting rod is pivotally connected to the lever arm between the pivotal connection of the piston connecting rod to the lever arm and the point at which the cam bears against the lever arm.
2 more elements
An engine comprising:
- a block having at least one cylinder;
- a piston movable axially in the cylinder through a power stroke and other strokes;
- a crankshaft rotatable in the block and including a crank arm and a crankpin with the crankpin being on the crank arm and offset from the axis of rotation for the crankshaft;
- linkage means between piston and the crankshaft for coupling the two together such that crankshaft rotates in a predetermined relation to the axial reciprocating movement of the piston in the cylinder, the linkage means including a lever arm, a piston connecting rod extended between the piston and the lever arm and being pivotally connected to the lever arm, and a crank connecting rod pivotally connected to the lever arm and to the crankpin of the crankshaft so as to be in offset relation to the axis of rotation for the crankshaft, and positioning means acting on the lever arm of the linkage means to position the linkage means such that a full stroke of the piston is translated into less than 180.degree. of rotational movement for the crankshaft and the angle between the crank arm and the crank connecting rod is relatively large for the entire duration of the power stroke for the piston.
1 more element
An engine comprising:
- a block having at least one cylinder therein;
- a piston movable axially in the cylinder through a power stroke and other strokes;
- a crankshaft rotatable in the block about a fixed axis of rotation and having a crank arm and a crankpin located on the crank arm such that it is offset from the fixed axis of rotation;
- a lever arm located between the piston and crankshaft;
- a piston connecting rod extended between the piston and the lever arm and being pivotally connected to both;
- a crank connecting rod extended between the crankpin on the crankshaft and the lever arm and being pivotally connected to both, the crank connecting rod being pivotally connected to the lever arm at a location offset from the location at which the piston connecting rod is connected to the lever arm;
- and a cam connected with and powered by the crankshaft, the cam bearing against the lever arm at a location offset from the pivotal connections of the piston and crank connecting rods to the lever arm, the cam being configured such that it causes the crank connecting rod to be at a relatively large angle with respect to the crank arm for the entire duration of the power stroke so that a force transmitted through the crank connecting rod is applied to the crank arm at a relatively large moment arm.
4 more elements
Dependencies are inferred from the claim text.