Abstract:
A trochoidal design rotary piston engine design has an external axis cogwheel oil pump which has a smaller diameter drive cogwheel which drives a larger diameter size cogwheel where the larger diameter size cogwheel is coupled to an oil-metering pump. The layer cogwheel being supported in a side disk disposed at one side of an engine housing forming a combustion engine.

Description:
BACKGROUND OF THE INVENTION  
         [0001]    This application claims the priority of German application 100 26 447.6, filed May 27, 2000, the disclosure of which is expressly incorporated by reference herein.  
           [0002]    This invention refers to a trochoidal design rotary piston engine with a rotary housing, two side disks, one with a bearing supported eccentric shaft and a rotary piston.  
           [0003]    Such rotary piston engine, for example, is also known from the German Patent Document DE-C 40 03 663 (corresponding U.S. Pat. No. 5,199,863). In this type of a rotary piston engine, the supply of lubricant, cooling oil, and metered oil occurs by way of an additional set of devices propelled by the drive system of the rotary piston engine.  
           [0004]    An object of the invention is to accomplish the task of providing the engine with an efficient supply of lubricant, cooling oil, and metered oil in a simplified manner.  
           [0005]    This object has been achieved according to preferred embodiments of the invention in that the eccentric shaft in the area of one of the side disks is equipped with a cogwheel which forms a cogwheel pump with one of the side disk bearing supported cogwheels for pressure oil supply from which the drive of the oil metering pump is derived.  
           [0006]    This type of construction provides a basis for a very compact drive, including a pump.  
           [0007]    According to a further advantageous design development of the preferred embodiment of the invention, it is expected that the side disk mounted cogwheel will have a greater diameter, preferably at least twice the diameter, than the eccentric shaft cogwheel that would be connected to the oil-metering pump. That would also achieve that the oil-metering pump would be driven at a relatively lower rate of revolutions as it is found to be desirable in practice.  
           [0008]    Other objects, advantages and novel features of the present invention will become apparent from the following detailed description of the invention when considered in conjunction with the accompanying drawings. 
       
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0009]    [0009]FIG. 1 shows a perspective view of a rotary piston engine, constructed according to a preferred embodiment of the invention;  
         [0010]    [0010]FIG. 2 shows a partial radial section of the rotary piston engine of FIG. 1 in an area of a pump drive; and  
         [0011]    [0011]FIG. 3 shows a partial radial section of the rotary piston engine at another level with the rotary piston engine oil reservoir. 
     
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT  
       [0012]    The rotary piston engine represented in FIGS. 1 through 3 is also a subject of parallel patent applications, Filed in Germany on May 27, 2000 with respective application numbers 100 26 448.4 and 100 26 449.2. The contents of corresponding U.S. application serial numbers ______ and ______, filed May 29, 2001 are incorporated herein by reference thereto to aid in an understanding of the present invention.  
         [0013]    The rotary piston engine represented in FIGS. 1 through 3 has a left side disk  1 , a rotary piston housing  2 , and a right side disk  3 . Each side disk consists of a cast part; one forming a radial wall enclosing the engine combustion chamber, and one of these radial walls exhibits a deflected shape external side covered by the side disk cover. The side disk cover  4  of the right side disk  3  is equipped with an extension with a cogwheel pump housing  5 , a cylindrical housing  6  with an injection pump  7 , and a shaft seal ring  8  for the eccentric shaft  9 . Located on the cogwheel pump housing  5  is an oil-metering pump  10  that drips lubricating oil into the internal tracks of the rotary piston housing  2  and the side disks  1  and  3 .  
         [0014]    The cogwheel pump housing  5  is equipped with a supply line  11  in which the oil to be pumped is primed. Additionally, the cogwheel pump housing  5  has an outlet opening  30  to which the oil is delivered. The oil circulating in cycle with an oil cooler and an oil filter, and possibly also in a low pressure cooling cycle flows from the rotary piston engine through a drainage opening  12  of the side disk cover  4  of the right side disk  3  and a drainage opening  13  of the left side disk into an oil reservoir  22  (FIG. 3).  
         [0015]    The supply line  11 , as well as the drainage openings  12  and  13  are equi-directionally arranged, in the same direction, in the execution example in the axial direction, so that the oil reservoir  22 , with its type of nozzle connections can be inserted into these openings. At the same time, a nozzle type connection is formed for the supply opening  11  from the priming intake pipe ( 21 ), which is installed in the oil reservoir  22  and is extended down to its bottom. The nozzle type connections, that is the intake pipe  21 , which leads to the supply channel  20  of the intake chamber  19  of the cogwheel pump and both nozzles  25  are sealed with seal rings  23  and  24 .  
         [0016]    The cogwheel oil pump comprises a drive cogwheel  14 , which is installed on the eccentric shaft  9 . This drive cogwheel  14  meshes with a drive cogwheel  15  (FIG. 2) which is located in the side disk  3  and the pump housing  5  serving side disk cover  4 . This driven cogwheel  15  has a significantly larger diameter, that is, a diameter that is at least twice the diameter of the cogwheel  14 . The drive cogwheel  15  of the cogwheel pump is connected to an oil-metering pump shaft by a slotted tongue and groove link  16 . The driven cogwheel  14  and the cogwheel  15  in the axial direction are sealed on the one side by the interior surface of the cogwheel disk cover  4  and on the other side by the plane surface of an inset plate  18 .  
         [0017]    According to another preferred embodiment of the invention, three cogwheels are used, including the drive wheel  14 , an intermediate wheel, and then the driven wheel  15 . This will make it possible, should that be desired, to implement a separation of the two oil cycles; for example, a low pressure cooling cycle and the pressure oil lubrication cycle. The drive cogwheel  14  could also diverge from the represented design and be developed by cutting gears on the eccentric shaft  9 .  
         [0018]    The foregoing disclosure has been set forth merely to illustrate the invention and is not intended to be limiting. Since modifications of the disclosed embodiments incorporating the spirit and substance of the invention may occur to persons skilled in the art, the invention should be construed to include everything within the scope of the appended claims and equivalents thereof.