Patent Abstract:
A four-stroke engine constructed using a gear with a port synchronized to the crankshaft by a power gear, and channels to direct the intake gases from the crankshaft housing into the combustion cylinder and to direct the exhaust gases out of the combustion cylinder into the atmosphere.

Full Description:
BACKGROUND OF THE INVENTION 
     TECHNICAL FIELD 
     This invention relates to internal combustion engines, which are employed in model aviation airplanes or other applications that can utilize two-stroke or four-stroke internal combustion engines. The four-stroke internal combustion engines are more desirable for their quietness of operation and high torque ability at lower Revolutions Per Minute. The four-stroke internal combustion engines that are currently available are heavier than desired and require constant maintenance and adjustment of the gears, cams, valves, valve seats, push rods, rod bearings, springs, rocker arms, bolts, lock nuts and various other parts. 
     REFERENCE CITED 
     United States Patents 
     U.S. Pat. No. 968,200 August 1910 Scott . . . 123/73 
     U.S. Pat. No. 1,165,135 December 1915 Seitz . . . 123/78 
     U.S. Pat. No. 3,418,993 December 1968 Scheiterlein et al . . . 123/195 
     U.S. Pat. No. 4,907,544 March 1990 Burrahm . . . 123/26 
     BRIEF SUMMARY OF THE INVENTION 
     The present invention provides a four-stroke internal combustion engine with means for the injection of a fuel and air mixture into the combustion chamber of the engine using stationary port placement and synchronized port rotation using gears. An Important feature of the present invention is that it requires no cams, push rods, rocker arms, springs or valves. 
    
    
     DESCRIPTION OF THE DRAWINGS 
     Other objects and attendant advantages of the present invention will be readily appreciated as the same becomes better understood by reference to the following detailed description when considered in connection with the accompanying drawings wherein, 
     FIG. 1 is a view of a preferred embodiment of the instant invention, 
     FIG. 2 is a view showing the relationship of the intake and exhaust passages of the instant invention, 
    
    
     DESCRIPTION OF THE INVENTION 
     Referring to the drawings, wherein like numerals indicate like or corresponding parts, a preferred embodiment of the four-stroke internal combustion engine is generally shown at  10  of FIG.  1 . 
     The engine includes a hollow crankshaft  12 , which is disposed in the engine housing or block  14  the same as a two-stroke internal combustion engine. The piston rod  16  connects the hollow crankshaft  12  to the piston  18 . The power gear  20  is mounted to the hollow crankshaft  12  so as to rotate with it. The ported gear  22  with the port  24  is rotably mounted in the engine housing  14  and engaged with the power gear  20  so as to rotate one-half of a rotation every time the hollow crankshaft  12  and power gear  20  rotates one whole revolution. 
     The gear cover  56  is mounted on the engine housing  10  and contains the port  28 , channel  30 , port  38 , channel  40  and gear bearing  58 . 
     As the hollow crankshaft  12  rotates counter-clockwise from the position shown in FIG. 1, the crankshaft intake port  44  in the hollow crankshaft  12  is positioned to close with respect to the engine housing port  42  in the engine housing  14 , thereby sealing the crankshaft housing chamber or crankcase  26  and compressing the air-fuel mixture inside the crankshaft housing chamber  26 , the chamber  32 , channel  30  and port  28 . As the piston  18  continues downward, the power gear  20  rotates the ported gear  22  causing the port  24  to present itself to the port  28  allowing the compressed air-fuel mixture to enter the passage  34  and into the cylinder compression chamber  48  when the piston  18  clears the port  34  as shown in FIG.  2 . This completes the first downward stroke. 
     As the hollow crankshaft  12  continues to rotate in the counterclockwise direction, the piston rod  16  forces the piston  18  upward, passing the passage  34  therefore closing off the cylinder compression chamber  48  and compresses the air-fuel mixture. At this point the crankshaft intake port  44  presents itself to the engine housing port  42  in the engine housing  14  and allows the passage of air into the crankshaft housing chamber  26  along with aspirated fuel, and continues to allow the intake into the crankshaft housing chamber  26  until the piston  18  reaches the upper limit of its travel at the top. This completes the second stroke. The check valve  50  restricts any back flow into the crankshaft-housing chamber  26  during the second stroke. 
     The compression caused by the piston  18  heats the air-fuel mixture in the cylinder chamber causing the heating element in the glow plug  54  to ignite the air-fuel mixture, forcing the piston  18  into a downward power stroke. As the piston  18  passes the port  36 , the expanded gasses pass through the port  36  on their way out of the engine. The port  24  in the ported gear  22  comes into position allowing the gasses to pass on through the port  38 , the channel  40 , and out to the atmosphere. The piston  18  is now at the extreme downward end of the third stroke. The crankshaft intake port  44  has been closed with respect to the engine housing port  42  throughout the complete third stroke and the air-fuel mixture has again been compressed in the crankshaft housing chamber  26 , the chamber  32 , channel  30  and port  28 . 
     The port  24  in the ported gear  22  is still in position to allow any remaining burnt gasses to pass through the port  36  to the port  38  and from the cylinder chamber through the bypass  46  between the engine housing and the sleeve  52 . 
     As the piston  18  starts its upward motion, it forces what remaining burnt gasses that are in the cylinder compression chamber  48  to pass out through the bypass  46  in the engine housing and the sleeve  52 . The crankshaft intake port  44  is again in position with the engine housing port  42  to allow the air-fuel mixture to again fill the crankshaft housing chamber  26 , while the check valve  50  restricts any back flow. This completes the fourth stroke.

Technology Classification (CPC): 5