Patent Publication Number: US-8534249-B2

Title: Rocker arm assembly with an anti-inversion feature

Description:
FIELD OF THE INVENTION 
     This invention relates to rocker arm assemblies for a valve train of an internal combustion engine and, more particularly, to an anti-inversion feature used in a rocker arm assembly to ensure proper orientation of a support pin, on which the rocker arm is rotatably mounted, is maintained. 
     BACKGROUND OF THE INVENTION 
     Pedestal mounted rocker arm assemblies have a rocker arm rotatably mounted on a support pin which in turn is fixed to a cylinder head through a pedestal. The support pin is also known as a trunnion. Conventionally, the support pin rests on the pedestal, also known as a support block, which positions the overall rocker arm assembly away from the cylinder head. One end of the rocker arm is in contact with the push rod while the other end of the rocker arm is in contact with a valve shaft. 
     Roller bodies, also referred to as radial bearings, are conventionally used between the support pin and the rocker arm to facilitate rotational movement of the rocker arm on the support pin and to handle radial loads. 
     Moreover, an inner sleeve and an outer sleeve can be used. When incorporated into the rocker arm assembly, the inner sleeve and the outer sleeve are positioned between a through-hole in the rocker arm and the support pin is affixed within the inner sleeve. Furthermore, the rocker arm assembly can include rolling elements that are positioned between the inner sleeve and outer sleeve to accommodate radial loads. 
     Rocker arm assemblies can also be subject to axial forces or thrust forces. These axial forces occur when certain parts are out of alignment, for example, when the rocker arm pallet and the socket, the lower end of the push rod and the socket, or the valve shaft and the rocker arm pallet are out of alignment. Such rocker arm assemblies are often referred to as “offset rocker arm assemblies.” 
     To ensure the support pin, which typically has a flat upper surface and a concave lower surface that contacts the pedestal, does not become inverted prior to final installation a captured fastener is typically affixed in a centrally located bore in the support pin. Essentially, a captured fastener is a washer that has a circular flange extending from one side of the washer with threading on the inside of the flange. A bolt is also typically inserted in the captured fastener and bore prior to final assembly. 
     Rocker arm assemblies utilizing a captured fastener are known, see, for example, U.S. Pat. No. 6,694,936 and U.S. patent application No. 2008/0098971. Such rocker arms employ a captured fastener and a fastening bolt to ensure the support pin does not become inverted prior to final installation of the rocker arm to the engine. The use of the captured fastener and fastening bolt adds to the cost and packaging envelope of the rocker arm assembly. Also, in certain instances, captured fasteners cannot be used. 
     Additionally, see, for example, U.S. Pat. No. 5,437,209, which discloses a rocker arm assembly. The support pin of the rocker arm assembly has a D-shaped feature at each end to prevent the support pin from inverting. The support pin engages in a D-shaped hole stamped into the outer bearing cup, coupled with an inner bearing sleeve that has a specified range of diametric clearances to the support pin journal, preventing the support pin from inverting. The geometry required to achieve the D-shaped features on the support pin and associated components is complex, which adds to the overall cost and time required to manufacture the rocker arm components that incorporate the D-shaped feature. 
     SUMMARY OF THE INVENTION 
     The present invention is directed to an anti-inversion feature that is incorporated into a rocker arm assembly. The anti-inversion feature prevents the support pin from inverting prior to final assembly of the rocker arm in an internal combustion engine. Thus, incorporating the anti-inversion feature into the rocker arm assembly will ensure the support pin remains in an upright position and will not become inverted between initial assembly and final installation in an internal combustion engine. 
     Specifically, the anti-inversion feature can be a washer, a plate, a plug, or a sleeve. The washer, which is intended for use with a cylindrical support pin, has a predominately flat face on one side and a curved face on the other. The curved face of the washer is intended to rest on a mating curved surface of the support pin. The plate, which has a flange that extends into the bore of the support pin, can include various combinations of a tab(s) and/or a protrusion(s) that extend in an upward direction, contacting the walls of a central opening in the rocker arm and/or downward direction, contacting the support pin. The plug, which can resemble any desirable shape, must be removed prior to final assembly and the sleeve, which is tubular, can be hollow and can either be removed or remain fixed in the bore of the support pin. 
     Broadly, the present invention can be defined as a rocker arm assembly for use in an internal combustion engine that comprises a rocker arm which has a transverse through-hole, a support pin which has a body with a centrally located bore and which is positioned in the through-hole and about which the rocker arm rocks, a bearing which is positioned at each end of the support pin in the through-hole between the support pin and the rocker arm, and an anti-inversion part which is affixed in the bore of the support pin. 
     The rocker arm can further comprise an outer sleeve that abuts an inner circumferential wall of the through-hole and an outer bearing wall that extends radially inward and covers the through-hole. Also, the rocker arm can further comprise an inner sleeve that abuts an outer circumferential wall of the support pin and an inner bearing wall that extends radially inward and covers an axial end wall of the support pin. The outer bearing wall can abut the inner bearing wall and can accommodate axial loads. Additionally, rolling elements can be positioned between and in contact with the inner sleeve and outer sleeve to accommodate radial loads. 
     The body of the support pin can have a flat upper surface and a curved lower surface. Alternatively, the body of the support pin can be entirely cylindrical with a central section and two ends. The central section can have a smooth, cylindrical surface and the ends, which are located on each side of the central section, can be stepped and narrower in diameter than the central section. 
     In one aspect of the invention, anti-inversion part can be a washer with a centrally located hole that has a first surface and a second surface. The first surface can be predominately flat and the second surface can have a predominately curved contour. The first surface further can have beveled faces at an edge of the washer and at the hole, and the second surface can have beveled faces along the curved contour. The second surface of the washer can engage a curved surface on a top portion of the support pin. Also, a fastening bolt can be secured in the bore of the support pin with the washer providing spacing between the bolt and the support pin. When a bolt is secured in the bore, the first surface of the washer is in contact with a head of the bolt and the second surface of the washer is in contact with the body of the support pin. 
     Further, the rocker arm can have a central opening, which is defined by a first wall, a second wall, a third wall, and a fourth wall. The first wall and the third wall face each other and the second wall and the fourth face each other and are transverse to the first wall and the third wall. 
     In accordance with another aspect of the invention, the anti-inversion feature can be a plate with a beveled hole connected to a hollow extension that engages in the bore of the supporting pin. The plate can be rectangular and, upon movement of the rocker arm, the plate is contactable with any of the walls of the rocker arm. 
     Alternatively, the plate can be predominately circular and have a tab which extends in a transverse direction. The tab can be at least one protrusion which extends in a generally upward direction. The protrusion can extend from an axial extending end of the tab and has a finger extending in a generally horizontal direction that contacts anywhere on the rocker arm, such as at an oil rail on a top area of the rocker arm. 
     In a further aspect of the invention, the plate can have a first generally extending vertical flange and a second generally extending vertical flange in opposite transverse directions. The first vertical flange and the second vertical flange can be contactable with the first wall or the third wall of the central opening of the rocker arm. The plate further can have tabs which are bendable downwardly, engaging the support pin to prevent the plate from rotating during tightening of a fastening bolt. The tabs can be on opposite sides of the plate, next to the first vertical flange and the second vertical flange, and diagonally opposite each other. 
     In yet another aspect of the invention, the anti-inversion feature can be a removable plug. The plug can have an upper portion, a central portion, and a lower portion. The upper portion and the lower portion can each be any shape. For example, the upper portion and the lower portion can be X-shaped or can be shaped in the form of a plus sign. The central portion can also be any shape, such as a circular disk, located between the upper portion and the lower portion. The lower portion is press fit in the bore of the support pin, the central portion rests on the support pin to keep the plug located vertically on the support pin, and the upper portion extends vertically from the central portion and is contactable upon movement of the rocker arm with walls in a central opening of the rocker arm, preventing inversion of the support pin. 
     In yet a further aspect of the invention, the anti-inversion feature can be a sleeve, which can be hollow. The sleeve can extend through the bore of the support pin and rocker arm, and is contactable upon movement of the rocker arm with bottom walls of the rocker arm, preventing inversion of the support pin. The sleeve can be removable if desired. Also, a bolt can be inserted in the sleeve during assembly of the rocker arm. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The present invention will be further understood and appreciated by reading the following description in conjunction with the accompanying drawings, in which: 
         FIG. 1  is a perspective view of the rocker arm assembly with an anti-inversion washer installed in the rocker arm assembly; 
         FIG. 2  is a perspective view of the rocker arm assembly with the washer and fastening bolt installed; 
         FIG. 3  is a perspective view of the washer; 
         FIG. 4  is a perspective view of a cylindrical support pin; 
         FIG. 5  is a side view illustrating the washer and the fastening bolt being installed in the rocker arm assembly; 
         FIG. 6  is a side cross-sectional view illustrating the washer and the fastening bolt installed in the rocker arm assembly; 
         FIG. 7  is a transverse cross-sectional view of the rocker arm assembly with the washer and the fastening bolt in an installed state; 
         FIG. 8  is a perspective view of the rocker arm assembly with one embodiment of an anti-inversion plate installed in the rocker arm assembly; 
         FIG. 9  is a perspective view of a cylindrical support pin; 
         FIG. 10  is a perspective view of the plate; 
         FIG. 11  is a transverse cross-sectional view of the rocker arm assembly with the rectangular plate in an installed state; 
         FIG. 12  is a side cross-sectional view illustrating the plate installed in the rocker arm assembly; 
         FIG. 13  is a side cross-sectional view illustrating the plate installed in the rocker arm assembly with the plate contacting one of the walls of the rocker arm; 
         FIG. 14  is a side cross-sectional view illustrating the plate installed in the rocker arm assembly with the plate contacting a wall of the rocker arm opposite the wall that the plate contacted in  FIG. 13 ; 
         FIG. 15  is a perspective view of the rocker arm assembly with an alternative embodiment of the anti-inversion plate installed in the rocker arm assembly; 
         FIG. 16  is a perspective view of the alternate embodiment plate; 
         FIG. 17  is a transverse cross-sectional view of the rocker arm assembly with the plate of  FIG. 16  in an installed state; 
         FIG. 18  is a side cross-sectional view illustrating the plate of  FIG. 16  installed in the rocker arm assembly; 
         FIG. 19  is a side cross-sectional view illustrating the plate of  FIG. 16  installed in the rocker arm assembly with the plate contacting one of the walls of the rocker arm; 
         FIG. 20  is a side cross-sectional view illustrating the plate of  FIG. 16  installed in the rocker arm assembly with the plate contacting a wail of the rocker arm opposite the wall that the plate contacted in  FIG. 19 ; 
         FIG. 21  is a perspective view of the rocker arm assembly with a further alternative embodiment of the anti-inversion plate in an installed state; 
         FIG. 22  is a top view of the further alternate embodiment of the plate in  FIG. 21  installed in the rocker arm assembly; 
         FIG. 23  is a perspective view of the further alternate embodiment plate; 
         FIG. 24  is a transverse cross-sectional view of the rocker arm assembly with the plate of  FIG. 23  in an installed state; 
         FIG. 25  is a side cross-sectional view illustrating the plate of  FIG. 23  installed in the rocker arm assembly; 
         FIG. 26  is a side cross-sectional view illustrating the plate of  FIG. 23  installed in the rocker arm assembly with the plate contacting one of the walls of the rocker arm; 
         FIG. 27  is a side cross-sectional view illustrating the plate of  FIG. 23  installed in the rocker arm assembly with the plate contacting a wall of the rocker arm opposite the wall that the plate contacted in  FIG. 26 ; 
         FIG. 28  is a perspective view of an anti-inversion plug installed in the rocker arm assembly; 
         FIG. 29  is a perspective view of the plug; 
         FIG. 30  is a transverse cross-sectional view of the rocker arm assembly with the plug in an installed state; 
         FIG. 31  is a side cross-sectional view illustrating the plug installed in the rocker arm assembly; 
         FIG. 32  is a side cross-sectional view illustrating the plug contacting one of the walls of the rocker arm; 
         FIG. 33  is a perspective view of an anti-inversion sleeve installed in the rocker arm assembly; 
         FIG. 34  is a perspective view of the sleeve; 
         FIG. 35  is a transverse cross-sectional view of the rocker arm assembly with the sleeve in an installed state; 
         FIG. 36  is a side cross-sectional view illustrating the sleeve installed in the rocker arm assembly; and 
         FIG. 37  is a side cross-sectional view illustrating the sleeve contacting one of the bottom walls of the rocker arm. 
     
    
    
     DETAILED DESCRIPTION OF THE DRAWINGS 
       FIG. 1  illustrates a rocker arm assembly  10  which accommodates an anti-inversion part  12 . The rocker arm assembly  10  has a rocker arm  14  which rotates about a support pin  16 . The support pin  16  passes through a transverse through-hole  18  in the side walls  20 ,  22  of the rocker arm  14 . The support pin  16  has a bore  24 , on which the anti-inversion washer  12  is positioned, centrally located in the body of support pin  16 . The bore  24  is positioned in a central opening  26  of rocker arm  14 . The central opening  26  has a first wall  28 , a second wall  30 , a third wall  32 , and a fourth wall  34 . The first wall  28  and the third wall  32  face each other and the second wall  30  and the fourth wall  34 , which are transverse to the first wall  28  and the third wail  32 , face each other. 
     The rocker arm assembly  10  is a straight line rocker arm. However, it should be understood that the anti-inversion parts  12 ,  70 ,  82 ,  102 ,  118 ,  126  of the present invention can also be used in offset rocker arm assemblies where the push rod, the ball socket and the rocker arm pallet (all not shown) do not lie on the same longitudinal plane. Such a rocker arm assembly is often chosen to accommodate large exhaust and intake port geometries which are needed to meet engine power requirements while meeting packaging constraints. 
       FIG. 2  illustrates the rocker arm assembly  10  with the washer  12  and a fastening bolt  36  installed. 
       FIG. 3  illustrates the washer  12 . The washer  12 , as shown, has a flat top  38  with beveled edges  40 ,  42  and a curved bottom  44  that also has beveled edges  46 . 
       FIG. 4  illustrates the support pin  16  that is intended for use with the washer  12 . The support pin  16  has a central section  48  and two ends  50 ,  52 . The central section  48 , in which the bore  24  is located, has a predominately smooth, cylindrical surface and bevel surface  54  surrounding the bore  24  and beveled surfaces  56 ,  58  at the sides of the central section  48  where the ends  50 ,  52  and the central section  48  meet. The ends  50 ,  52 , which are located on each side of the central section  48 , are stepped  60  and narrower in diameter than the central section  48 . 
       FIG. 5  illustrates the rocker arm assembly  10  with the washer  12  and the fastening bolt  36 , prior to final installation, being installed in the rocker arm assembly  10 . 
       FIG. 6  illustrates a side cross-sectional view of the rocker arm assembly  10  with the washer  12  and the fastening bolt  36  installed. As illustrated, the washer  12  rests predominately on the cylindrical support pin  16 . 
     As shown in  FIG. 7 , the through-hole  18  passes through the rocker aim side walls  20 ,  22 . The support pin  16  is positioned in the through-hole  18  and allows the rocker arm  14  to rotate. A bearing  62 ,  64  is positioned at each axial end of the support pin  16 . Each bearing  62 ,  64 , as shown, optionally has an inner sleeve  66 , an outer sleeve  68 , and rolling elements  69  positioned between the inner sleeve  66  and the outer sleeve  68 . The rolling elements  69  are illustrated as generally cylindrical, however, needle rollers or spherical rollers can be employed. This arrangement handles radial forces in the rocker arm assembly. 
       FIG. 8  illustrates a perspective view of one embodiment of another anti-inversion part, a plate  70 , installed in the rocker arm assembly  10 . The plate  70  is installed in a bore  72  of a support pin  74  and prevents the support pin  74  from inverting by contacting either the first wall  28  or the third wall  32  of the central opening  26 . 
       FIG. 9  illustrates the support pin  74 . The support pin  74  has a central section  49  and two ends  50 ,  52 . The central section  49 , in which the bore  72  is located, has a predominately flat upper surface and a curved lower surface with a bevel surface  54  surrounding the bore  72  and beveled surfaces  56 ,  58  at the sides of the central section  49  where the ends and the central section  49  meet. The ends  50 ,  52 , which are located on each side of the central section  49 , are stepped  60  and narrower in diameter than the central section  49 . 
       FIG. 10  illustrates a perspective view of the plate  70  which, as shown, is rectangular. The plate  70  has a central hole  76  that is beveled  78  connected to a hollow extension  80 . The hollow extension  80  is fixed in the bore  72  of the support pin  74 . 
       FIG. 11  illustrates a cross-sectional view of the rocker arm assembly  10  with the rectangular plate  70  installed. As shown, bearings  62 ,  64  are positioned at each axial end of the support pin  74  with an inner sleeve  66 , an outer sleeve  68  and rolling elements  69  positioned between the inner sleeve  66  and the outer sleeve  68 . 
     Similarly,  FIG. 12  illustrates a side cross-sectional view of the plate  70  installed in the rocker arm assembly  10 . 
       FIGS. 13-14  illustrate the plate  70  contacting one of the walls  28 ,  32  of the rocker arm  14  when the rocker arm  14  is in motion, which prevents the support pin  74  from inverting. 
       FIG. 15  illustrates a perspective view of another plate  82 , installed in the rocker arm assembly  10 . The plate  82  is installed in the bore  72  of the support pin  74  and prevents the support pin  74  from inverting by contacting one or more of the walls  28 ,  30 ,  32 ,  34  of the central opening  26 . Additionally, the fastening bolt  36  can be installed in a hole  84  of the plate  82  and the bore  72  of the support pin  74 . 
       FIG. 16  illustrates a perspective view of the plate  82 . The plate  82 , as shown, is predominately circular and has a hole  84  that is beveled  86  connected to a hollow extension  88 , which is fixed in the bore  72  of the support pin  74 . The plate  82  also has a tab  90  protruding from the predominately circular shape. Extending vertically from transverse ends of the tab  90  are two flanges  92 ,  94 . Each flange  92 ,  94  has a finger  96 ,  98  that is contactable with the rocker arm  14 . The fingers  96 ,  98  may, for example, contact an oil rail  100  on a top are of the rocker arm  14 . Alternatively, the plate  82  can also utilize only one flange  92  or  94  and one finger  96  or  98  on one side of the tab  90 . Further, alternatively the flanges  92 ,  94  and fingers  96 ,  98  can extend from an axial end of the tab  90 . 
       FIG. 17  illustrates a cross-sectional view of the rocker arm assembly  10  with the plate  82  installed. As shown, bearings  62 ,  64  are positioned at each axial end of the support pin  74  with an inner sleeve  66 , an outer sleeve  68 , and rolling elements  69  positioned between the inner sleeve  66  and the outer sleeve  68 . 
     Similarly,  FIG. 18  illustrates a side cross-sectional view of the plate  82  installed in the rocker arm assembly  10 . 
       FIGS. 19-20  each illustrate the plate  82  contacting at least one of the walls  28 ,  30 ,  32 ,  34  of the rocker arm  14  when the rocker arm  14  is in motion, which prevents the support pin  74  from inverting. 
       FIGS. 21-22  illustrates a perspective view and a top view, respectively, of yet another plate  102 , installed in the rocker arm assembly  10 . The plate  102  is installed in the bore  72  of the support pin  74  and prevents the support pin  74  from inverting by contacting either the first wall  28  or the third wall  32  of the central opening  26 . Additionally, the fastening bolt  36  can be installed in a hole  104  of the plate  102  and bore  72  of the support pin  74 . 
       FIG. 23  illustrates a perspective view of the plate  102 . The plate  102  has a hole  104  that is beveled  106  connected to a hollow extension  108 , which is fixed in the bore  72  of the support pin  74 . The plate  102  further has flanges  110 ,  112  protruding in a predominately vertical direction from opposing sides of the plate  102 . The plate also includes tabs  114 ,  116  adjacent to each flange  110 ,  112  and oppose each other diagonally. The tabs  114 ,  116  are bendable to aid in securing the plate  102  to the support pin  74 . 
       FIG. 24  illustrates a cross-sectional view of the rocker arm assembly  10  with the plate  102  installed. As shown, bearings  62 ,  64  are positioned at each axial end of the support pin  74  with an inner sleeve  66 , an outer sleeve  68  and rolling elements  69  positioned between the inner sleeve  66  and the outer sleeve  68 . 
       FIG. 25  illustrates a side cross-sectional view of the plate  102  installed in the rocker arm assembly  10 . 
       FIGS. 26-27  each illustrate the plate  102  contacting one of the walls  28 ,  32  of the rocker arm  14  when the rocker arm  14  is in motion, which prevents the support pin  74  from inverting. 
       FIG. 28  illustrates a perspective view of the rocker arm assembly  10  with a plug  118  installed in the bore  72  of the support pin  74 . The bore  72  is positioned in a central opening  26  in the rocker arm  14  on a flat section  120  of the support pin  74 . 
     As shown in  FIG. 29 , the plug  118  has an upper section  122 , a central section  124 , and a lower section  126 . As illustrated, the upper section  122  and the lower section  126  resemble an X-shaped or a plus symbol. The central section  124 , which connect the upper section  122  and the lower section  126 , takes the shape of a circular disk. However, the upper section  124 , the lower section  126  and the central section  124  can each resemble any desired shape. 
       FIG. 30  illustrates a cross-sectional view of the rocker arm assembly  10  with the plug  118  installed in the bore  72  of the support pin  74 . The lower section  126  is press fit in the bore  72  of the support pin  74 , the central section  124  rests on the support pin  74  to keep the plug  118  located vertically on the support pin  74  and the upper section  122  extends vertically from the central section  124  and is contactable upon movement of the rocker arm  14  with walls in a central opening  124  of the rocker arm  14 , preventing inversion of the support pin  74 . As shown, bearings  62 ,  64  are positioned at each axial end of the support pin  74  with an inner sleeve  66 , an outer sleeve  68 , and rolling elements  69  positioned between the inner sleeve  66  and the outer sleeve  68 . 
       FIG. 31  illustrates a side cross-sectional view of the rocker arm assembly  10  with the plug  118  installed in the bore  72  of the support pin  74 . 
       FIG. 32  illustrates a side cross-sectional view of the rocker arm assembly  10  with the plug  118  installed in the bore  72  of the support pin  74  in rotation. As shown, the upper section  122  of the plug  118  prevents the support pin  74  from inverting by contacting one of the walls  28 ,  32  or the central opening  26  in the rocker arm  14 . 
       FIG. 33  illustrates a perspective view of the rocker arm assembly  10  with a sleeve  128  installed in the bore  72  of the support pin  74 . The bore  72  is located in a central opening  26  in the rocker arm  14  on the flat section  120  of the support pin  72 . 
     As shown in  FIG. 34 , the sleeve  128  is hollow and has a nominal wall thickness. 
       FIG. 35  illustrates a cross-sectional view of the rocker arm assembly  10  with the sleeve  128  press fit in the bore  72  of the support pin  74 . The sleeve  128  extends beyond the support pin  74  and rocker arm  14 , and is contactable upon movement of the rocker arm  14  with bottom walls  130  of the rocker arm  14 , preventing inversion of the support pin  72 . As shown, bearings  62 ,  64  are positioned at each axial end of the support pin  16  with an inner sleeve  66 , an outer sleeve  68 , and rolling elements  69  positioned between the inner sleeve  66  and the outer sleeve  68 . 
       FIG. 36  illustrates a side cross-sectional view of the rocker arm assembly  10  with the sleeve  128  installed in the bore  72  of the support pin  74 . 
       FIG. 37  illustrates a side cross-sectional view of the rocker arm assembly  10  with the sleeve  128  installed in the bore  72  of the support pin  74  and the support pin  72  in rotation. As shown, the lower section  126  of the sleeve  128  prevents the support pin  72  from inverting by contacting one of the bottom walls  130  of the rocker arm  14 . 
     REFERENCE CHARACTERS 
     
         
           10  Rocker Arm Assembly 
           12  Washer 
           14  Rocker Arm 
           16  Support Pin 
           18  Through-hole 
           20  Side Wall 
           22  Side Wall 
           24  Bore 
           26  Central Opening 
           28  First Wall 
           30  Second Wall 
           32  Third Wall 
           34  Fourth Wall 
           36  Fastening Bolt 
           38  Flat Top 
           40  Beveled Edge 
           42  Beveled Edge 
           44  Concave Bottom 
           46  Beveled Edge 
           48  Central Section 
           49  Central Section 
           50  End 
           52  End 
           54  Beveled Surface 
           56  Beveled Surface 
           58  Beveled Surface 
           60  Stepped Surface 
           62  Bearing 
           64  Bearing 
           66  Inner Sleeve 
           68  Outer Sleeve 
           69  Rolling Elements 
           70  Plate 
           72  Bore 
           74  Support Pin 
           76  Hole 
           78  Beveled Surface 
           80  Extension 
           82  Plate 
           84  Hole 
           86  Beveled Surface 
           88  Extension 
           90  Tab 
           92  Flange 
           94  Flange 
           96  Finger 
           98  Finger 
           100  Oil Rail 
           102  Plate 
           104  Hole 
           106  Beveled Surface 
           108  Extension 
           110  Flange 
           112  Flange 
           114  Tab 
           116  Tab 
           118  Plug 
           120  Flat Section 
           122  Upper Section 
           124  Middle Section 
           126  Lower Section 
           128  Sleeve 
           130  Bottom Walls