US1756761A - Piston and connecting rod - Google Patents

Description

A. E. REID PISTON AND CONNECTING ROD April 29, 1930.

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Filed Feb. 26, 1929 Patented Apr. 29, 1930 UNITED sures earner err-ice AIlLLAN E. REID, 0F BOSTON, MASSACHUSETTS, ASSIGNCR TO REID PISTON COMPANY, OF BROOKLINE, MASSACHUSETTS, A CORPORATION OF .LJIASSACI-IUSETTS PISTON AND CONNECTING ROD Application filed February 26, 1929. Serial No. 342,917.

This invention pertains to connecting rods and pistons of the type commonly employed in internal combustion engines, air compressore and the like, and relates more particular.-

1y to improved means'for uniting apiston and connecting rod. In my ,co-pending applica tion ,Serial No. 827,006 filed December 19, 1928, I have described some of the practical difliculties arising from the use of the usual wrist pin for uniting the piston and-rod, and

have broadly disclosed means illustrative of a novel genus'of connecting means of which the present invention is a specific embodiment. In the aforesaid application I described and broadly claimed an arrangement in which the usual separate wrist pin is eliminated with. consequent improved function and increased facility in assembly and separation of the parts, together with certain specific illustrations thereof, wherein a pivot member permanently united to the connecting rod turns in a bearing disposed inside of the piston.

. In accordance with the present invention I affix the pivot member to the piston, as for example making it an integral projection upon the inner surface of the piston, and with this pistonl employ a connecting rod which does not differ, except optionally as to the diameter of its journal opening, from connecting rods of usual type. This arrangementpossesses the desirable characteristics inherent in the generic construction, as more fully set forth in my aforesaid application, and as compared with the specific disclosure of said application possesses certain further advantages, as for example the permissive use of a connecting rod of substantially usual type, as already mentioned,simplification of parts, and greater ease in manufacture.

In the accompanying drawings, one desirable embodiment of the invention is illustrated by way of example, and in the drawings,

Fig. 1 is a vertical section, partly in elevat-ion, showing the piston and a part of its associated connecting rod and indicating the engine cylinder in broken lines;

Fig. 2 is a view similar to Fig. 1 but omitting the connecting rod and cylinder;

Fig. 3 isa transverse section substantially v on the line 33 of Fig. 2; and

F'g. i is a vertical section on the line H of Fig.1, omittingthe cylinder.

Referring to the drawings,'the invention isillustrated as embodied in a trunk piston 1 having the usual skirt portion 2 and head3, such pistons being commonly employed 1n in ternal combustion engines. In Fig. 1, the

piston is illustrated'as disposed within a cylinder 4 having a head 5.

VVithin' the piston I provide suitablesupporting means, for example the webs 6, 7

and 8, (Fig. 3) projecting integrally from 66 material, for example bronze having a finished peripheral surface. The supporting webs 6, 7 and 8 engage the cylindrical pivot member 9 at one end and support it with its his transverse to the axis of the piston and preferably, though not necessarily, at a point such that it is substantially symmetrical with the axis of the piston. That is to say, the ends ofthis cylindrical member 9 are preferably at substantially equal distances from the axis of the piston. V I Preferably the piston wall is furnished with an opening 11 through which suitable tools maybe introduced for machining and finishing the pivot member 9 with its bushing 10. The free or unsupported end 12 of the pivot member is spaced from the inner surface of thepiston body, as shown at 13, sufliciently to permit the head 14 of a connect ing rod 15 to be introduced between the end 1 2of the pivotmember and the inner surface of the piston body, as indicated in broken lines in Fig. 1.

. Thus, in assembling the parts, the end of V provided with an internal boss 19 of tapering sembled in this manner, the other en'd'of the connecting rod is attached to the crank on the crank shaft of the engine and is thereby kept in operative engagement with the pivot member 9.

Preferably the head 14 of the connecting rod is split and provided. with. outstanding bosses 16 and 17 at opposite sides of the gap,

'such'bosses receiving an adjusting bolt or screw 18, whereby the effective diameter of.

the journal opening in the connecting rod may be varied to take up wear. Since the head of the bolt 18 is exposed at the open end of the piston, wear may be taken up without removing the piston from the cylinder.

fdesired, the head of the piston may be form adapted to collect oil and to direct it to an oil receiving opening or openings 20 in the head 1 10f the connecting rod.

\Vhile I have shown integral webs 6, 7 and 8 for supporting the pivot member, I contemplate that other means may be used for retaining this part in 'operative position, and while the pivot member has here been shown as disposed symmetrically with respect to the axis of the piston, this is not wholly necessary, and-its position may be varied in accordance with circumstances, provided, however, that its free end is always spaced'from the piston wall sui'liciently to admit the head of the con necting rod between them.

I claim:

1. The combination of a piston with a connecting red, the connecting rod having a journal opening whose axis is transverse to that of the piston, and a pivot member permanently united tothe piston and adapted to fit within the opening in the connecting rod.

2. The combination of a hollow piston with a connecting rod, the connecting rod having ajournal opening and the piston having an internal pivot member permanently united to it,

saidconnecting rod being capable of assembly with the piston by movement of the connecting rod relatively to the piston such as to cause the journal opening in the rod to slip axially over the pivot member.

3. The combination of a piston and connecting rod useful in an internal combustion engine having a cylinder, said piston having a V pivot member permanently attached at one end to the piston body and free at its other end, the free end of the pivot member being spaced from adjacent parts to permit assembly of the connecting rod with the pivot mem ber without withdrawing the piston from the cylinder.

at. The combination with a trunk piston having a member projecting integrally from its inner surface, said member having a finished cylindrical portion constituting a pivot, with a connecting rod having a journal openingfor the reception of said pivot.

5. A trunk piston having an internal'pivot member-disposed with its axis transverse to that of the piston, and means permanently; connecting said pivot member tothe piston body, said pivot member being free at one end at least to permit assemblage of a connecting rod therewith without disturbing the connection between the pivot member and the piston body.

6. A. trunk piston having an internal pivot member disposed with its axis transverse to that of the piston, and means permanently connecting said pivot member to the pistonbody, said pivot member being arranged symmetrically with respect to the axis of thepis ton and being spaced at one'end'at least from the piston wall to permit assemblage of a con: necting rod therewith. 7

7. A trunk piston having an internal pivot member of annular form disposed symmetri 1 cally with respect to the axis of the piston and with'the axis of the pivot member transverse to that of the piston, and means engaging one end of the pivot Inemberfor-permanently attach-ingit to the piston body, the other end of the pivot member being spaced from the inner surface of the piston.

8. A trunk piston having webs projecting from its inner surface anda substantially cylindrical bearing member united at one end to said webs and supported thereby, the other end of the pivot member being free and extending beyond the webs for operative engagement with a connecting rod.

9. A trunk piston having an internal pivot member of substantially cylindrical form, and means uniting one end of said pivot'member to the piston body, the other end of the pivot member being free, said pivot member comprising a bushing of wear resistantmaterial adapted to enter within a journal opening in a-connecting rod whereby to form an articulated joint between the piston and rod;

Signed by me at Boston, Massachusetts, this 23rd day of February, 1929.

ALLAN E. REID.

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