US2318954A

US2318954A - Internal combustion engine

Info

Publication number: US2318954A
Application number: US430318A
Authority: US
Inventors: Miller Ralph; Richard L Jansen; John W Anderson
Original assignee: American Locomotive Co
Current assignee: American Locomotive Co
Priority date: 1942-02-11
Filing date: 1942-02-11
Publication date: 1943-05-11
Anticipated expiration: 1960-05-11

Description

May 11, 1943. R. M ILLER ETAL INTERNAL COMBUSTION ENGINE Filed Feb. 11,1942

Patented May 11, 1943 UNITED STAT-ES PATENT OFFICE INTERNAL COMBUSTION ENGINE Application February 11, 1942, Serial No. 430,318

Claims.

This invention relates to internal combustion engines, and more particularly to connecting rodbearing box structures for a V-type engine.

In conventional V-type engines, it is customary to employ a two-piece bearing box, mounted on a crank of the engine crank shaft, to which is pivotally secured a connecting rod for one cylinder, the connecting'rod for the opposite cylinder being integrally formed with the upper section of the bearing box. In such a construction the integral connecting rod-box upper section can not be removed from the engine through the cylinder because of the large size of the box upper section. Thus it is necessary to remove such a connecting rod-box upper section through the crank case of the engine, which necessitates the disassemblage of a considerable number of parts of the engine.

The instant invention is an improvement of the above described conventional connecting rodbearing box structure, providing, in place .of the aforementioned integral connecting rod-box up- .per section, a connectingrod which isrigidly but removably connected to the .box upper section and which may be removed from the engine throughthe cylinder. The instantinven- .tion also includes an improved articulated joint between a connecting rod and, a bearing .box.

Anaobject of the present, invention is to provide a connecting rod-bearing box structure for a V- type internal combustion engine, having a rigid connecting rod separable from the box for removal from the engine through the engine cylinder with which it is associated.

A further object is to provide an improved articulated joint between a connecting. rod and a bearing box fora V-type internal combustion engine.

.Referring to the drawing forming a part. of this .application,.Figure 1 is a vertical transverse sectional View of a portion of an internal combustion engine embodying the present invention, taken through the center of an engine crank,

parts being shown in full and parts being broken away; Fig. 2 is a section of the bearing box and adjacent end of the articulated connecting rod, taken on the line IIII of Fig. 1, .a .part being shown in full; Fig. 3 is a section of the bearing .boxupper section and adjacent end of the rigid connecting rod, taken on the line III-III. of Fig. 1;-Fig. l-is an isometric viewof a connecting rod bushing; and Fig. 5 is an isometric view .of a connecting rod pin.

Referring to the drawing, only sufiicient of the engine has been shown to illustrate the present invention. The engine is of the V-type, opposite cylinders I and 2 being in the same transverse planeand diverging from a crank shaft 3. Crank shaft3 is hollow, and is adapted to containcrank case oil for lubricating the bearings of the connecting rods, as will presently appear.

A bearing boxlI is mounted on a hollow crank 5 of :the crank shaft. Thebox is made in two parts, a lower section 6 and an upper section 'I secured together by bolts 8, and containing a central orifice 9 and bushing I!) for mounting the box on the crank.

Uppersection I provides a fiat thrust face II directed toward cylinder 2 and a concave cylindrically shaped thrust face I2 directed toward cylinder I. Lugs I3,, one on either side of face II and providing therewith a groove, extend toward cylinder2, and lugs I l, one on either side of face I2, extend toward cylinder I. Lugs I3 have aligned orifices I5, there being two orifices in eachlug. A connecting rod i6, extending into cylinder, 2, has a lower end portion of tonguelike formation providing a bottom flat thrust face IT. The tongue-like end portion is disposed, with a working fit, in the groove between lugs I3 with itsface I! in engagement with face II. Orifices I8 are formed in the lower end of the rod in alignment with aligned orifices I5. The aligned orifices are tapered and tapered bolts I9 are disposed in the orifices and are drawn tight therein by nuts 20. The tapers of the orifices I5 and. I8 and bolts, I9 are so directed as to draw faces II and I1 tightly together when nuts 29 are drawn up. Therefore piston thruststransmitted through rod I6 to the crankshaft are taken by face II and no excessive shearing force falls on the bolts I9. Bolts I9 rigidly secure rod It .to box 4 while permitting removal therefrom.

Lugs I I have aligned circular orifices 2| of a radius similar to the radius of the face I2 and in axial alignment therewith. A bushing 22, best shown in Fig.4, is'disposed in the orifices 2I and on the face I2. Bushing 22 is cut away at its central portion providing a slot 23 of the width of the face I2 opening toward cylinder I,

I Tabs 24 adjacent the slot overlap faces 25 of the box adjacent face I2, preventing rotation of the bushing 22 in the orifices 2|.

A cylindrical pin 26, best shown in Fig. 5, is disposed in the bushing. An orifice 21 is formed V in the pin 26, extending from end to end thereof,

An articulated connecting rod 30, extending into cylinder I, and having a bottom flat .thrust face 3i, is disposed, with a working fit, between lugs M with its face 3| in engagement with face 29 and its side faces snugly engaging the adjacent side faces of the slot. An orifice 32 is formed in the lower end of the rod 30 in alignment with orifice 21. The aligned orifices 21 and 32 are tapered and a tapered bolt 33 is disposed in the orifices and is drawn tight therein by a nut 34. The tapers of the orifices 21 and 32 and bolt 33 are so directed as to draw faces 29 and 3| tightly together when the nut 34 is drawn up. Therefore piston thrusts transmitted through rod 30 to the crank shaft are taken by face 29 and no excessive shearing force falls on the bolt 33. The thrust is transmitted through pin 26 to the bushing 22 and therefrom to the box 4. Pin 25 floats in bushing 22, being held against endwise displacement by rod 3|] abutting lugs 14 at its sides, and therefore no shearing force falls on pin 26.

Rod is rigidly secured to pin 26 by the tapered bolt 33 and fiat faces 29 and 3| so that it moves bodily with pin 26, pin 26 being free to rock in bushing 22. Thus rod 30 is pivotally connected to box 4 and is further easily removable therefrom. In considering rod thrusts, pin 26 may be considered as part of rod 30 and thrusts are therefore transmitted from rod 39 to upper box section I, disregarding bushing 22 which is from a thrust standpoint part of section I.

The connecting rods I6 and 33 have central lubricating

oil bores

35 and 36 respectively. Crank 5 has an oil passage 3] connecting the hollow interior of the crank with an oil groove 38 formed in the inner face of the bushing l0. Bushing In further has

oil orifices

39 and 40 opening into groove 38, orifice 39 being in line with bore 35 and communicating therewith through a passage 4| formed in the upper box section i, and orifice 40 being in line with bore 36 and communicating therewith through a passage 42 formed in the upper box section 1, bushing 22 and pin 26, bolt 33 having a centrally disposed groove 43 permitting flow of oil thereby.

From the foregoing description, it will be seen that rods l6 and 30 may be separately disconnected from box 4 without disturbance of other parts of the engine, by removal of bolts [9 and 33 respectively, pin 26 and bushing 22 remaining with the box. The rods are removable from the engine through their respective cylinders, they being of a size to permit this, as clearly shown in Fig. 1.

It will further be seen that on account of the size of upper box section 1, rod iii if made integral therewith could not be removed from the engine through the cylinder.

Rod i6 takes the place of the conventional rigid rod formed integrally with the upper section of the box. If desired, it may be employed with a conventional articulated rod comparable to rod 30, or with any box upper section too large to pass with the rod through the cylinder. Similarly, rod 3!] may be employed with a conventional integral rod-upper box section construction if desired.

While there has been hereinbefore described an approved embodiment of this invention, it will be understood that many and various changes and modifications in form, arrangement of parts and details of construction thereof maybe made without departing from the spirit of the invention and that all such changesand modifications as fall within the scope of the appended claims are contemplated as a part of this invention.

The invention claimed and desired to be secured by Letters Patent is:

1. A connecting rod assembly comprising a bearing box; a connecting rod rigid at its inner end with said bearing box; an articulated connecting rod, said connecting rods being disposed at a V-angle to each other, said bearing box having a cylindrically concave face directed toward said articulated rod outer end, and 9. lug at each side of said face extending toward said rod outer end, each of said lugs having a circular orifice, said orifices and said concave face having a common axis; a pin extending through said orifices in rotatable association therewith and having a face opposite and in rotatable association with said concave face, said pin having a slot between said lugs opening toward said rod outer end, said slot having a bottom face directed toward said rod outer end, said articulated rod having its inner end disposed in said slot and having a face opposite said slot face, said opposite faces being respectively associated for transmitting thrusts; and a bolt extending through said articulated rod inner end and said pin rigidly connecting said articulated rod to said pin.

2. A connecting rod assembly comprising a bearing box; a connecting rod rigid at its inner end with said bearing box; an articulated connecting rod, said connecting rods being disposed at a V-angle to each other, said bearing box having a cylindrically concave face directed toward said articulated rod outer end, and a lug at each side of said face extending toward said rod outer end, each of said lugs having a circular orifice a bushing secured in said orifices in engagement therewith and with said face, and having a slot between said lugs opening toward said rod outer end and having a bottom concave face, and said orifices and said concave faces having a common axis; a rotatable pin mounted in said bushing, having a convexly faced portion opposite said bushing concave face and a slot between said lugs opening toward said rod outer end, said pin slot having a bottom face directed toward said rod outer end, said articulated rod having its inner end disposed in said pin slot and having a face opposite said pin slot face, said respective opposite faces being in aligned thrust association; and a bolt extending through said articulated rod inner end and said pin rigidly connecting said articulated rod to said pin.

3. A connecting rod assembly comprising a bearing box; a connecting rod rigid at its inner end with said bearing box; a connecting rod articulated at its inner end to said box, said connecting rods being disposed at a V-angle to each other, said articulated rod inner end and said box each being provided with lug means, one of said lug means having a pair of spaced lugs and the other of said lug means having a lug extending into said space, said box lug means extendin toward said articulated rod outer end and being cylindrically orificed to provide bearing means; a pin, said pin being cylindrically faced and mounted at its said facing in said bearing means, said box being cylindrically concavely faced concentric with said bearing means,.said pin being cylindrically faced opposite said box facing, and being in rotatable association with said bearing means and with said box facing, said rod lug means being faced and said pin being cut away and faced opposite said rod lug'means facing; and a bolt extending through said rod lug means and pin rigidly securing said articulated rod and pin together, said respective opposite facings being in aligned thrust association.

4. A connecting rod assembly comprising a bearing box member having an orifice for mounting same on a crank pin; a detachable connecting rod member for articulation at its outer end to a piston, one of said members having spaced lugs and a thrust face therebetween forming a groove open toward the other of said members and directed crosswise of the axis of said orifice, said other member having a tongue snugly fitting said groove and having an end thrust face opposite and parallel to said groove face; bolts parallel to the axis of said orifice, one at each side of and spaced from the longitudinal center line of said rod member, said bolts being tapered and engaging similarly tapered holes in said lugs and said tongue for drawing said faces in tight thrust engagement and holding said members rigidly together, said thrust faces being axially in alignment with said rod member; and a connecting rod member articulated to said box member, said connecting rod members being disposed at a V-angle to each other.

5. A connecting rod assembly comprising a bearing box having an orifice for mounting same on a crank pin; a detachable connecting rod for articulation at its outer end to a piston, said box having spaced lugs and a thrust face therebetween forming a groove open toward said rod and directed crosswise of the axis of saidorifice, said rod having a tongue snugly fitting said groove and having an end thrust face opposite and parallel to said groove face; bolts parallel to the axis of said orifice, one at each side of and spaced from the longitudinal center line of said rod, said bolts being tapered and engaging similarly tapered holes in said lugs and said tongue for drawing said faces in tight thrust engagement and holding said rod and box rigidly together, said thrust faces being axially in alignment with said rod; and a connecting rod articulated to said box, said connecting rods being disposed at a V-angle to each other.

RALPH MILLER. RICHARD L. JANSEN. JOHN W. ANDERSON.