Patent Document

TECHNICAL FIELD  
         [0001]    This invention relates to journal bearings and particularly in an application for rotary machinery that requires at least two bearings and where the journal bearing will provide the function of these two bearings.  
         BACKGROUND OF THE INVENTION  
         [0002]    As one skilled in this technology appreciates, the customary bearings utilized for the piston rods and fly wheel utilized on piston engines powering motorcycles are roller bearings. One set of the roller bearings are utilized on the male connection and two sets of roller bearings are utilized on the complementary female connection. In a higher speed motorcycle that, for example, is used for racing and its speed is nearly 200 miles per hour and can accelerate to that speed in less than seven (7) seconds, the roller bearings utilized in the lower speed motorcycles are not adequate to support the load and metallic bushings are utilized and these types of bushings have not met with much success. It will be noted that the rotary speed of these engines are generally in the area of 6000 revolutions per minute and the pounds per square inch per feet per minute or PV is generally in the area of 65,000,000. Hence, it is obvious, that the load on the bearing is such that the selection of bearings used for these applications present a major problem and it is the objective of this invention to solve this problem. Moreover, as a consequence of conceiving a bearing to solve the problem for the high speed motorcycle, I have found that this invention has application for the lower speed motorcycle inasmuch as it requires fewer component parts and is less expensive than the heretofore known bearings. In the same vein, the bearings of this invention is not limited to motorcycle and combustion engine applications, it can be utilized wherever two bearings are required and the machinery can accept an inner bearing surface and an outer bearing surface of the journal bearing of this invention.  
           [0003]    In other words, I have found that I can provide for the same application that heretofore required at least three sets of roller, ball or journal bearings, a single journal bearing where the inner diameter and outer diameter are designed to accommodate bearing surfaces. In an alternate embodiment, a roller bearing or ball bearing can be incorporated into the journal bearing so that in essence, two bearings replace the three bearings without sacrificing any function of the three bearings.  
         SUMMARY OF THE INVENTION  
         [0004]    An object of this invention is to provide an improved journal bearing design that includes working surfaces on the inner diameter and the outer diameter.  
           [0005]    A feature of this invention is that the bifurcated end of a female piston rod and the end of the complementary male piston rod are supported by a single journal bearing with the bifurcated end being rotary supported by the inner diameter of the journal bearing and the end of the male piston rod is supported on the outer diameter by the same journal bearing and the bearing is locked in the bifurcated end.  
           [0006]    A feature of this invention is a unique journal bearing that is characterized as being simple in design, to assemble and is relatively inexpensive. In one embodiment the material utilized is silicon nitride.  
           [0007]    A still further feature of this invention is the incorporation of a roller or ball bearing within the journal bearing so that the inner rotating mechanism is supported by the roller or ball bearing and the outer rotating or articulating mechanism is supported by the outer diameter surface of the journal bearing.  
           [0008]    The foregoing and other features of the present invention will become more apparent from the following description and accompanying drawings. 
       
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0009]    These figures merely serve to further clarify and illustrate the present invention and are not intended to limit the scope thereof  
         [0010]    [0010]FIG. 1 is a schematic illustration of prior art reciprocating piston “V” type engine showing the piston rods connected to the fly wheel;  
         [0011]    [0011]FIG. 2 is a fragmentary exploded plan view showing the details of this invention;  
         [0012]    [0012]FIG. 3 is a fragmentary view in elevation showing the invention assembled;  
         [0013]    [0013]FIG. 4 is a fragmentary bottom plan view of the assembled invention of FIG. 3;  
         [0014]    [0014]FIG. 5 is an enlarged fragmentary sectional and plan view of FIG. 2 modified to exemplify another embodiment where a roller bearing is mounted on the inner diameter of the journal bearing so that it rotary supports the inner rotary member; and  
         [0015]    [0015]FIG. 6 is a plan end view of FIG. 5. 
     
    
     DETAILED DESCRIPTION OF THE INVENTION  
       [0016]    While this invention is being described in its preferred embodiment for a high speed motorcycle application, as one skilled in this art will appreciate this invention has application for any type of rotary motion machine where at least two bearings are required and the inner diameter of the inventive journal bearing is one working surface and the outer diameter is another working surface and where the bearing is fixed in place. Suffice it to say that the journal bearing of this invention is fixed in place and one rotary member is rotary supported on the inner diameter of the bearing and another rotary member is rotary supported on the outer diameter of the bearing. It also should be understood that in the preferred embodiment one of the piston rods of the V-type of combustion engine rotates 360 degrees while the other piston rod operating in unison with the first piston rod articulates over a small angle. In another embodiment of this invention a roller bearing supported in a cage is mounted on the inner surface of the inside diameter of the journal bearing so that it rotary supports the inner rotating member. Obviously, as one skilled in this art will appreciate, ball bearings can be readily substituted for the roller bearings and the bearing selection will be predicated on costs and load factors.  
         [0017]    The invention can best be understood by referring to FIG. 1 which schematically illustrates a prior art V-type combustion engine generally illustrated by reference numeral  10  having a pair of angularly disposed cylinders  12  and  14  and pistons  16  and  18  respectively disposed therein. Piston rod  20  is suitably and hingedly connected to piston  16  and piston rod  22  is suitably and hingedly connected to piston  18  in any well known manner. The remote ends of piston rods are suitably connected to a pair of fly wheels where only fly wheel  24  is shown. The other fly wheel is mounted on the opposite face of the piston rod  20  and each fly wheel is connected to the piston rod  20  and piston rod  22  via the eccentric pin or shaft crank journal  26 .  
         [0018]    As is apparent from the foregoing, the piston rods when displaced drive the fly wheel in the direction of arrow A and in turn, drive the main shaft  30  for extracting power from the engine. As this invention is merely concerned with the bearings supporting the piston rods  20  and  22  to fly wheel  24 , the description of the drive train for powering the motorcycle is omitted here from for the sake of brevity and convenience. Suffice it to say that the drive wheel drives either a spoke, pulley or power gear that, in turn, drives the wheel of the motorcycle.  
         [0019]    The invention can best be seen by referring to FIG. 2 which shows the piston rod  20  having a bifurcated end  32  including arms  34  and  36 . The journal bearing of this invention generally illustrated by reference numeral  40  comprises a cylindrical body  42  having a central through bore  44 , an outer working surface  46  on the outer diameter and an inner working surface  48  on the inner diameter. Obviously, these surfaces are suitably finished as is typical in journal bearings to accommodate the rotary motion of the rotary machine. In this embodiment as best seen through FIGS. 2 through 4, the bearing  40  is shrunk fitted into the aligned complementary bores  50  and  52  formed in arms  34  and  36 , respectively, of the bifurcated end  32 . The fit is done in a well known manner by heating the bifurcated end and shrinking the bearing  40  just prior to inserting the bearing into the central bore. The heat/cool ratio for the shrink fit is predicated on the end use of the rotary machine. Obviously the respective end portions  54  and  56  are rigidly secured to the inner diameter surface of the bores  50  and  52  so that the bearing can not rotate during the entire operating envelope of the engine.  
         [0020]    The end portion  60  of male piston rod  22  includes a through bore  62  whose diameter is slightly larger than the outer diameter of the journal bearing  40  so that it can articulate about the outer surface  46  thereof. In assembling the unit the bearing  40  is first fitted into the bores of the female piston rod  20  and the male piston rod  22  is then inserted into the bifurcated portion of female piston rod  20  noting that the bore  62  aligns with the bore  44  of the bearing  40 . The now assembled male piston rod  22 , female piston rod  20  and journal bearing  40  are installed on the shaft crank journal  26 .  
         [0021]    The bearing surfaces are lubricated by feeding pressurized oil into the passage  70 , into drilled hole  72  formed in the shaft crank journal  26  and then, into a plurality of circumferentially spaced drilled holes  73  where the oil migrates to the bearing surfaces of the bifurcated portion  32  and the female piston rod  20  (an annular space out of proportion is shown in FIG. 3 for purposes of illustrating the bearing surface, but in actuality these surfaces are closely spaced) where the space is sufficient to define a hydrodynamic film of oil, and the bearing surface  74  intermediate the ends of journal bearing  40 . The oil is pumped in a well known manner with commercially available equipment including a sump pump that collects and returns the spent oil to the pumping system for continuous flow of oil into and out of the bearing.  
         [0022]    It is apparent from the foregoing that the shaft crank journal  26  rotates 360 degrees around the journal bearing  40  within the central bores  50  and  52  at the speed (rpm) of the fly wheel being powered by the pistons of the engine and that the male piston rod  22  articulates about the outer surface portion  74  of the journal bearing  40 .  
         [0023]    In another embodiment as is exemplified by FIG. 5, the journal bearing  40  is utilized in the same manner as the apparatus is described in connection with FIGS.  1 - 4  except in this embodiment a roller bearing generally illustrated by reference numeral  80  is inserted in the central bore  44  of journal bearing  40 . The roller bearing comprises a commercially available suitable cage  82  having the annular end members  84  and  86  and a plurality of spaced axial rods  88 , separating the rollers  90 . When this embodiment is utilized in the embodiment of FIG. 2, the shaft crank journal  26  will fit inside of the roller bearing  80  and will be rotary supported thereby. In other words the rollers engage the surface on the inner diameter of the journal bearing and the shaft crank journal  26 . The male piston rod will be rotary supported in the same manner as was described in connection with FIGS. 2 through 4, namely the journal bearing  40  will extend through the bores in the bifurcated section of the female piston rod and the male piston rod will be mounted over the top of the journal bearing so that the outer diameter surface of the journal bearing supports the articulating motion of the male piston rod. The shaft crank journal  26  will, obviously, be rotary supported by the rollers  90  of the roller bearing  80 . As one skilled in this art will appreciate, when designing the actual hardware of a rotary machine, the type of bearing will be predicated on the loads, speeds and cost of the component parts. However, by virtue of this invention, in one embodiment, a single bearing serves the purpose of three bearings without sacrificing function and durability, and in the other embodiment two bearings serve the same purpose of the three bearings and, again without sacrificing function and durability.  
         [0024]    By virtue of this invention the flywheel is rotary driven by the pistons in a V-shaped engine utilizing a single journal bearing  40  or a combined journal bearing and roller bearing that serve the dual function of supporting the female piston rod  20  and the male piston rod  22  and eliminating the need of three bearings that have heretofore been utilized for the same environment. In the high speed motorcycle environment the material that is preferred for the journal bearing is silicon nitride while in a lower speed motorcycle environment the material for the journal bearing can be any well known bearing material such as bronze, brass, aluminum, iron or their alloys etc.  
         [0025]    Although this invention has been shown and described with respect to detailed embodiments thereof, it will be appreciated and understood by those skilled in the art that various changes in form and detail thereof may be made without departing from the spirit and scope of the claimed invention.

Technology Category: 2