VIBRATION FREE PISTON ENGINE

• US 3,791,227 A
• Filed: 04/21/1972
• Issued: 02/12/1974
• Est. Priority Date: 04/21/1972
• Status: Expired due to Term

• Current Assignee: Myron E. Cherry
• Original Assignee: Myron E. Cherry
• Inventors: Cherry, Myron E.
• Primary Examiner(s): Wyche, Benjamin W.
• Assistant Examiner(s): Shoemaker, F. D.
• Application Number:
  US05/245,836
• Time in Patent Office: 662 Days
• Field of Search: 74/52,603,604 123/192B
• US Class Current: 74/52
• CPC Class Codes: F01B 9/02 with crankshaft
• CPC Class Codes: F16H 21/365 with planetary gearing having a ratio of 2:1 between sun gear and planet gear
• CPC Class Codes: Y10T 74/18272 Planetary gearing and slide
• CPC Class Codes: Y10T 74/2184 Vibration dampers

Abstract

In combination with an apparatus having at least one stationary ring gear and one planet gear for each ring gear for converting rotary motion into rectilinear reciprocating motion of a reciprocating member attached to the pitch circle of the said planet gear by rotary attach means, a planet gear swallowing counterweight for each planet gear having mass sufficient to offset that of the reciprocating member, the counterweight having a cross sectional shape which is quadrilaterally symmetrical about its center of gravity, the center of gravity of the counterweight being located on a line passing through the pitch circle of the planet gear, diametrically opposite the reciprocating member and offset from the axis of the planet gear by a distance equal to one half the pitch diameter of the planet gear for substantially eliminating vibration therefrom while simultaneously providing offset counterbalancing for the reciprocating member.

Claims

1. In combination with an apparatus having a stationary ring gear and a planet gear engaging said ring gear for converting into rotary motion the rectilinear reciprocating motion of a reciprocating member rotatably attached to said planet gear at a point aligned with the pitch circle of said planet gear, a first counterweight carried by said planet gear to counterbalance the mass of said reciprocating member, said first counterweight being quadralaterally symmetrical and having its center of gravity aligned with the pitch circle of said planet gear opposite the point on the pitch circle with which the reciprocating member attachment point is aligned, a crankshaft upon which said planet gear is carried, rotated by movement of said planet gear within said ring gear, and a second counterweight carried by said crankshaft to rotate with said crankshaft in an opposite direction from said first counterweight to counterbalance said first counterweight and said reciprocating member, thereby substantially eliminating vibration of the apparatus.

2. The apparatus as set forth in claim 1 wherein said first counterweight is of circular shape.

3. Apparatus for changing rectilinear motion to rotational motion comprising:

a mounting block having two interior channels with perpendicular intersecting axes;

means within one of said channels providing rectilinear movement along the axis of said one channel, a pair of mutually parallel ring gears mounted within said block concentrically with the axis of said other channel, a pair of planet gears, each engaging a respective one of said ring gears, a pair of swallowing counterweights, each attached to a respective one of said planet gears, each being quadralaterally symmetrical about its center of gravity, and the center of gravity of each being aligned with the pitch circles of said planet gears;

a connecting rod journal interconnecting said swallowing counterweights, to which said rectilinear movement providing means is rotatAbly attached, said connecting rod journal having a center axis aligned with the pitch circles of said planet gears at a point opposite that with which said swallowing counterweights are aligned, whereby said rectilinear movement means exhibits only a component of motion along the axis of said one channel and the center of gravity of said swallowing counterweights exhibit only a component of motion perpendicular to the axes of both said one and said other channels, a pair of crankshaft members each mounted to a respective planet gear and including, a shaft having an axis parallel to the axis of said other channel, a crankshaft counterweight, means for attachment to its respective planet gear, whereby when said planet gear rotates within said ring gear, said crankshaft member and crankshaft counterweight rotate, the counterweight thereby providing components of motion along the axis of said one channel and perpendicular to the axes of said one and said other channels to cancel the component of motion of said swallowing counterweights and the components of motion of said rectilinear movement providing means.

4. The apparatus of claim 3 wherein said swallowing counterweights are of circular shape.

5. The apparatus of claim 4 wherein said rectilinear movement providing means comprises a piston and a piston rod, said piston rod being operatively connected to said planetary gear.