US1699656A - Rocker arm - Google Patents

Description

Jan. 22, 1929. 1,699,656

J. T. FAGAN ROCKER ARM Filed May 28, 1926 3 Sheets-Sheet 1 Egg nlllll I} 1' 1 Mb I llll Jan. 22, 1929. 1,699,656

J. T. FAGAN ROCKER ARM Filed May 28', 1926 s sheets-sheet 2 Meniorf 3 Sheets-Sheet 3 J. T. FAGAN Jan.'22, 1929.

ROCKER ARM Filed May 2a, 1926 Patented Jan. 22, 1929.

OHN T. FAGAN, orcLnvELi-inig rinrem's. OHIO.

ROCKER ARM.

Application filed May 28,

This invention relates to rocker arms, such for example as are used to operate the valves known as the overhead type of an internal combustion engine.

An objectof the invention is to provide a rocker arm that is quiet in operation;

- A further object is to provide a rocker arm that has a practically frictionless hearing, and on which bearing there is practically no movement of the arm;

A further obj ect is to provide a rockerarm in whicl'r the wearing parts are made replaceable and of a superior quality of hardened steel; 7

A further object is to provide a rocker arm that maybe readily detached from the shaft for repairs when necessarywithout dismantling a number of parts auxiliary thereto;

A further object is to provide a simplified shaft for use in connection with rocker arms;

A furtherob-j'ect is to construct the shaft so that a rocker arm may be readily attached thereto and detached therefrom;

A further object is to provide a simplified :f shaft which supports a detachable bearing A further object is to provide a sectional shaft from which one section may be re moved without disturbing the remainder of the shaft; e e

Othef objects will appear upon reading the specification. i

In the accon'ipanying drawings,

Figures 1, 2, 3, ando are side, top, bottom, and left and right end views, respectively, of one form of a rockerarm.

Fig. 6 is a side view, partly in section, ofa modified form but showing also a sectionjof a shaft with its spring seating conical recess and bearing edge, and the grooved bearingplate, also the spring and the end of a pin or screw which centers and retains the upper end of the spring; N

Figs. 7 8, and 9 are bottom, andleft and right end views respectively, of Fig. 6;

Fig. 10 is a view on the line 10- -10 of Fig. 1, showing the bearing plate support, and half-round groove therein;

Figs. 11 and 12 are side and top views respectively in elevation, of a modification in r i which the arm is made of stampings;

Fig. 13 is view of a longitudinal section on the line 1313 of Fig. 12;

Fig. 14; is a view of a vertical section on the line 1-=l.l4 of Fig-11;.

1926. Serial No. 112,262.

Fig. 15 is a view of a horizontal section on the line'15-15 of Fig. 11; e

ig. 16 is a plan View, looking at the right hand end of Fig. 11; i

17 illustrates side, top and end views of the grooved bearing plate;

Fig. 18 an edge View of a detachable hardened steel contact shoe, shown inplace in Figs. 11, 12 and 13; p,

Figure 19 illustratestop and side views of a metal threaded nut 23, shown in section in Fig. 13, and which provides for the adjustment of the threaded bolt 8 so that the valves may be given the proper timing, and co-opcrates with the upper lock to secure the bolt in adjustment;

Figs. 20 and 21 are side and top plan views of an upper stamping, such as shown in Figs. 11, 12, and 13, but having thespringretaining pin stamped from the metal;

Fig. 22 is a top plan View of ametal strip, to be bent into a shaft, having portions pressed up to form cone shaped cups for the springs upon thecompletion of the shaft;

Fig. 23 is a transverse section on the line 23-23 of Fig. 22; f

Figs. 24, and 25 are sectional views. showing the stagesof bending andpressing to complete the shaft, Fig. 25 being a section on the line 25-25 ofFig. 28;

Fig. 26 is also a sectional view on the line 25-25, of Fig. 28, also showing the bearing edge in place, and also showing in elevation the ends of a bolt; e

Figs. 27 and 28 are side and top plan views, respectively, ofthe completed shaft;

Fig. 29 is a view in perspective of a further modified shaft, in which strips of steel are suitably milled and drilled, and clamped and bolted together, with the bearing edge held between the metal strips;

Fig. 30 is a view ofa vertical section on the line 30-3O of Fig. 29;

Fig. 31 is a view of a vertical section on the line 3131 of Fig. 29, showing the coneshaped recess, and the bearing edge.

Fig. 32 is a perspective view of a detached bearing edge; y I

Fig. 33 is a perspective sectional view on the line 3333 of Fig. 37, showing how the end of the shaft is secured to a support;

Fig. 34 is a. perspective view partly in section showing one type, for example a forging, of a completely ssembled rocker arm mounted on theshaft;'

Figs. 35 and 36 are top and end )lan views, respectively, of a sectional shat such as shown in Fig. 29; Fig. 35 showing one of the clamps and bolt removed, and showing the joint between two sections of the shaft-,- Fig. 37 is a side view, partly in elevation and partly in section, of the mounted shaft; and i Fig. 38 is a sectional view on the line In the modification shown in Figs. 1 to 10 inclusive, a die casting 1, made preferabl of aluminum and provided with ample sti enin-g webs .2, has an opening 3 through which passes a shaft 4, Fig. 6, upon which the rocker armis mounted. The casting in Fig. 1 is provided with a detachable shoe, 5, at the right end, made of hardened steel, and, isprovided with an enlargement 6 at the left end through which is drilled a hole 7, Fig. 3, for. a bolt 8, Fig, 6. The casting is further provided with an especially shaped base 9 in the opening 3 for holding a bearing plate 10, Fig. 6. In Figs. 1 and 2, an upper hole 11 is provided through which passes a screw or pin, now shown, to engage the upper end of a spring 12, Fig. 6, a pin 16 being shown in Fi 6 y,

In Fig. 6, at the right is shown a removable bolt 13, the face 14 of which is hardened, and which takes the place of the shoe 5 in Fig. 1. At the left of Fig. 6 is the bolt 8, having the hemispherical head 15 made of hardened steel. At the top of the opening is a pin 16, referred to above, which retains and centers the upper end of the spring 12, the lower end of which is seated in the cup 17 of the shaft 4. Securely held in the shaft 4, is a hardened steel-bearing edge 18, one form of which is shown in Fig. 32, and which is provided with a lower rounded edgc comparable to a half of a round steel rod of small diameter, the bearing edge restingin the hardened steel bearing block 10, see also Fig. 17, there being a very small, practically no movement, of the hearing 10 at the point of support during use. The small contact surface of the rounded edge of the bearing on the block provides a substantially frictionless bearing, substantially free from wear, and is also noiseless. The bearing corresponds to a roller hearing, The hemispherical surface 15. on the bolt 8, rests in any type of hemispherical recess in the top of a push rod, not shown.

In the modification shown in Figs. 11 to 16, the rocker arm is made of metal stampings, or of thin metal forgings. The stamping 20 is of thin sheet metal, provided with lateral sockets or supports 21 to receive the bearing plate 22, Fig. 13. At the left end is an enlargement to receive the threaded block 23, Figs. 13, 15, and 19, through which passes the bolt 8. At the right end, a de- The free extremity of the arm is provided with a springretaining pin or rivet, 27, Fig. 13, or may have a tongue of metal pressed downwards, at28, Figs. 20 and 21. The shaft 4. with its bearing edge and spring, shown in Fig. 13, is assembled as in Fig. 6. The completely assembled rocker arm shown in Figs. 11, 12, and 13 may be applied to the shaft while the shaft is in place, and is substantially balanced on each side of the bearing edge,

Illustrations in Figs. 22 to 28 show a modified shaft made of a metal stamping or forging, In Fig. 22, a metal strip 30, punched for bolt holes 31, and additional holes 32, with punched-up flaring sides, 33, Figs. 22 and 23, at properly located intervals. is stamped or forged through the stages represented by Figs. 24 and 25,; Fig. 25 representing a completed shaft on. the cross section 25- 25 of Fig- 28. As a result of stamping or forging with proper tools, the sides 3333 are flared outwards, forming the spring-holding cup of the shaft. The stamping or forging of the strip is conducted so that the holes 31 register to receive the bolt 34, Fig. 26, and the flatundeforrned sides 35 of the sheet 30 form the parallel sides 36 of the completed shaft, the opening 37 between the sides 36 receiving the bearing edge 38, also shown in Fig. 32.

The bolt holes 31 are located so as to register with the hole 39 in bearing edge 38, Fig. 32. In Figs. 29 to 38 are shown views of a further modification in. which the component parts comprise parallel strips of steel, 40. suitably milled to form recesses 41 on each side, Figs. 29 and 31, and drilled to receive bolts 42, Figs. 29 and 30. The strips -40 are further milled, or drilled after assembly, as at 50, Fig. 35, to receive the bolts 43, Figs. 29 and 33, which aid in maintaining the strips 40-4-40 properly spaced. Upon assembly, the spaced strips 40-40 receive the bearin edge 38, Fig. 32, the bolt 42 passing througii the hole 39; the cuts 45 in the bearing edge 38 cooperating'with the milled recesses 41, Figs. 29 and 31, to form the spring-holding cup 46, Figs. 29, 31, 34, 35, and 38. The up per and lower edges of the strips 40 are fur ther clamped by clamps 47, 47, Figs. 29, 31, 33, 35 and 37, the clamps 47-47 being drilled to receive the bolt 43, which bolts may enter a threaded hole in the engine at 48, or may be secured in posts 49-49, Fig. 37, thereby being rigidly supported. The shaft in Fig. 35 is shown in sections at Ill) 43, shown in Fig. v37, and the removal of the upper clamps 47, 4:7.

The assembled rocker armshown in Figs, 1 to 9 isslipped over the shaft, the bearing plate 10 pressed against the bearing edge 18, and the spring 12 placed in thecup l7 and centered around the pin 16; the shaft is then secured in its place in the engine; a

With the type of rocker arm shown in Figs. 11 to 16, the rocker arm comprisesa forked construction when completely assembled, and the shaft is secured in place by straddling the forked members over. the shaft, and the spring placed in thecup and around the pin 27. r i i i In operation, the valve stem 55, Fig. 34, is struck by the shoe 24 and actuated, the rocker arm receiving its motion from the engine by the ordinary operating rod, not shown, which strikes the ball-shaped head of the bolt 8. In normal operation, the actual movement at thepointof support be. tween the bearing edge 38 and bearing plate 22, Figs. 13 and -3et,and in Fig. 6 at18 and 10, is an oscillating or rolling movement and so slight as to be negligible; substantially no signs of wear appeared after a test corresponding to over thirty thouand miles of travel ofan automobile. The operation of the arm is also noiseless. At the endof the test above noted, substantiallyno wear was observed on the surfaces 5, or 14,01. 24, or the bolt head 15.jj

I claim:

1. A rocker arm for internal combustion engines,comprising an arm, a bearing plate, said bearing plate supported in said arm, an open-forked arm including a spring retaining means, and removable wear-resisting impact surfaces on opposite ends of said rocker arm.

2. A rocker arm comprising a metal stamping, bearing-supports secured in said stamping, an open forked arm extending over and spaced above said bearing-supports, a spring centering agent in said arm, and the extremities of said metal stamping con structed to receive wear-resisting impact surfaces.

3. A rocker arm comprising a metal stamping, bearing-supports secured in said stamping, an open forked overhanging arm spaced above said bearing supports, a hearing in said supports, a spring centering agent in said arm and located over the bearin and wear-resisting impact surfaces de tachably secured to said metal stamping.

4. A rocker arm comprising a metal stamping, bearing-supports;secured in said stamping, a separate stamping comprising an overhanging arm spaced above said bearing supports and provided with means to engage therocker arm stamping, a spring centering agent in said arm and located above the bearing-supports, and means to hold detachable wear resisting surfaces on said rocker arm stamping.

, 5. In combination, arocker arm comprising an open forked assembly of arms con structed to straddle a shaft, a shaft located between said forked arms, said shaft provided with a spring seating means, a spring centering agent on one of said arms, a bean mg-support on .one of said arms, bearing surface in saidisupporhand, a bearing on said shaft cooperating with said bearing surface, a spring cooperating with said shaft and one of said arms to retain the shaft hearing in firm. but oscillatable relation with said bearing surface and thereby support said rocker arm upon said shaft. y

6. A shaft comprising parallel sides, said sides spaced to receive a detachable bearing edge, cooperating spring retainingrecesses on the surface opposite tothebearing edge surface, and said sidesprovided with means to retain the same in cooperative registry with the bearing edge. 7 i

7. A shaft comprising parallel strips,sai 1l strips spaced to receive a detachable bean. ing edge, each Of'SELiCl strips containing a recess, the recesses on thetwo strips ,cooperatingto form a spring holding cup, a detachable bearing edge, saidbearing edge constructed to fit between the strips and aportion thereof to form the bOttOm edge of said springholding cup, means to retain said bearing edge inplace, means to securely maintain the two strips in register, and means to secure the shaft to a support.

8. A shaft comprising parallel strips, said strips provided with recesses on their inner faces, said recesses located to cooperate and form a spring holding cup, a detachable bearing edge, a part of said edge constructed to form the bottom of said cup, and provided with a bolt hole, each of said strips provided with a bolt hole and located to register with each other and with the hole in the bearing edge, a bolt to clamp said strips and bearing edge together, clamp arranged to engage the strips near their ends and constructed to receive a bolt, said second bolt located to secure said shaft to a support.

9. In combination with a rocker arm, a detachable rigidly supportedvbearing edge" comprising a thin plate and rovided with a rounded edge, a bearingsur ace, said bearing surface arranged to roll over said edge during its movement.

10. A rocker arm comprising a trough like body, a curved transwerse surface on the lower part of and inside of said trough, and an opening through one end of said body.

11. A rocker arm comprising a troughlike body, lateral supports within said trough, and side walls extending above the supports.

12. A rocker arm comprising a troughlike body, a passage atone end of said body, lateral supports extending in the walls of said body, said walls extending-above said lateral supports. I

13. rocker arm comprisin a troughlike body, a depressed interme iate portion in said trough, lateral supports extending in the walls of said body, said walls extending above said lateral supports.

a 14. A rocker arm comprising a trough like body, a passage at one end of said body, a depressed intermediate portion in said trough, lateral supports extending in the walls of said body, said walls extending above the level of said lateral supports.

15. A rocker arm comprising a troughlike body, a passage at one end of said body, a curved depressed portion inside of and on the lower'part of said body, upwardly extending walls from said depressed portion, and a detachable hardened wearing surface on said body.

16. A rocker arm comprising a troughlike body, a passage at one end of said body, a curved depressed ortion inside of and on the lower art of said body, upwardly extending wal s from said depressed portion, lateral supports in said walls, anda detachable hardened wearing surface on said body. 1 y y 17. The combination comprising a troughlike rocker arm body, lateral extensions in the walls of said body, a shaft having a reeacso section extending into the trough between the walls and into [the lateral extensions, said shaft section having a rounded bearing surface on its lower edge.

18. The combination comprising atroughlike rocker arm body, a curved depressed portion inside of and on the lower part of said body, upwardly extending walls from said depressed portion, lateral extensions in said walls, a shaft having a section depending into said lateral extensions, said shaft zection having a lower rounded bearing surace.

19. A rocker arm comprising a troughlike metal stamping, and a threaded block rigidly engaged by said stamping.

20. Arocker arm comprising a trough like metal stamping, a threaded block in said stamping, and portions of the walls of said stamping folded into positive engagement with said block and securely holding the same.

21. A rocker arm comprising a trouhlike metal stamping, a threaded block rig idly engaged by said stamping, a hardened detachable wearing element engaged by said threaded block, and a lock-nut-agent cooperating with said threaded block to firmly hold said detachable wearing element.

22. The combination comprising a troughlike metal rocker arm stamping, a threaded passage at one end of said stamping, a depressed intermediate portion in said stamping, lateral portions in said stamping, side walls extending above the lateral portions, and a shaft having a section depending into said lateral port-ions, said shaft section having a lower rounded bearing surface.

In testimony whereof I hereby afiix my signature.

JOHN T. FAGAN.

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