Apparatus and method for a balanced internal combustion engine coupled to a drive shaft

• US 4,834,033 A
• Filed: 10/31/1986
• Issued: 05/30/1989
• Est. Priority Date: 10/31/1986
• Status: Expired due to Term

• Current Assignee: Melvin J. Larsen
• Original Assignee: Melvin J. Larsen
• Inventors: Larsen, Melvin J.
• Primary Examiner(s): BENNETT, HENRY A
• Application Number:
  US06/925,795
• Time in Patent Office: 942 Days
• Field of Search: 123/58 R, 123/58 A, 123/58 AB, 123/47 R, 123/47 A, 123/56 B, 123/56 BB, 123/56 BC, 123/56 C, 74/55, 74/57, 74/60, 74/22 A, 74/27, 74/84 A
• US Class Current: 123/56.8
• CPC Class Codes: F01B 3/045 by two or more curved surfaces, e.g. for two or more pistons in one cylinder
• CPC Class Codes: F02B 1/04 with fuel-air mixture admission into cylinder
• CPC Class Codes: F02B 2075/025 two
• CPC Class Codes: F02B 2075/125 Direct injection in the combustion chamber for spark ignition engines, i.e. not in pre-combustion chamber
• CPC Class Codes: F02B 75/26 Engines with cylinder axes coaxial with, or parallel or inclined to, main-shaft axis; Engines with cylinder axes arranged substantially tangentially to a circle centred on main-shaft axis
• CPC Class Codes: Y02T 10/12 Improving ICE efficiencies
• CPC Class Codes: Y10T 74/18312 Grooved
• CPC Class Codes: Y10T 74/18336 Wabbler type

Abstract

An internal combustion engine is described in which the piston movement is parallel to the drive shaft. The engine cylinders are arranged in opposed pairs and the piston rods directly coupled so that the power stroke in one cylinder can assist with the compression stroke in the associated cylinder. The coupled or common piston rods have attached thereto a carriage that engages in a cam groove in the drive shaft. The drive shaft cam groove receives the force of the carriage as it is propelled by the pistons and the resulting torque causes a rotation of the drive shaft. The cylinders include a precompression chamber that assists in the exchange of combustion products with air. The internal combustion engine does not require special cooling and does not require a starter motor.

Claims

1. An internal combustion engine comprising:

at least one pair of cylinders, wherein piston rods from each of said cylinder pairs are coupled;

a cam drum positioned generally parallel to each of said cylinder pairs, said cam drum having a cam groove, said groove encircling said cam drum in a predetermined path; and

a roller mechanism coupled to each of said coupled piston rods, each of said cylinder pairs positioned relative to said cam drum so that said roller mechanism is in said groove, rotation of said cam drum being determined by motion of said roller mechanism in said predetermined path, wherein said roller mechanism has a separate rotating element for contacting each side of said groove.

2. The internal combustion engine of claim 1 wherein each of said cylinders has a lower cylinder precompression chamber associated therewith, flow of air into said precompression chamber and flow of air out of said precompression chamber being determined by a position of a cylinder piston in said cylinder.

3. The internal combustion engine of claim 1 comprising at least two cylinder pairs, said at least two cylinder pairs symmetrically disposed with respect to said cam drum, wherein cylinders on opposite ends of said symmetrically disposed cylinder pairs have a power stroke activated simultaneously.

4. The internal combustion engine of claim 3 wherein fuel is injected and spark ignited as a stratified charge within said cylinders during a last stage compression or during said power stroke of said engine.

5. The internal combustion engine of claim 4 wherein said cylinders are fabricated from a ceramic material, said engine operating without special cooling apparatus.

6. The internal combustion engine of claim 5 wherein said piston and said cylinder are shaped to form a generally cylindrical combustion chamber into which fuel is injected and ignited when said piston is in a top dead center position.

7. The internal combustion engine of claim 6 further comprising a drive shaft, said drive shaft coupled to said cam drum by means of a viscous material.

8. The internal combustion engine of claim 4 further comprising sensor means for determining an angular position of said cam groove, said sensor means controlling said fuel injection and ignition.

9. The internal combustion engine of claim 8 further comprising electronic means for starting engine.

10. The internal combustion engine of claim 1 further comprising an air intake valve having said piston rod passing through an aperture in said intake valve;

and, a friction gland coupling said piston rod and said air intake valve.

11. The method of translating reciprocating motion of a rod into rotational motion of a cam drum and for translating rotational motion of said cam drum to reciprocating motion of said rod, said method comprising the steps of:

constraining said cam drum to have only rotational motion, said cam drum having a groove fabricated therein;

providing a carriage mechanism having at least two rotating members coupled thereto;

constraining said rod to move with translational motion;

coupling said carriage to said rod; and

positioning said rod to provide that a first rotating member engages a first wall of said drum groove structure and that a second rotating member engages a second wall of said drum groove.