US1659799A - Piston - Google Patents

Description

G. C. AUSTIN Feb. 21 1928.

PISTON Filed Dec. 14, 1925 Y INVENTOR (fizonc e C. AUSTIN Patented Feb. 21, 1928.

NITEDY STATES PATENT OFFICE.

GEORGE G. AUSTIN, OF LOS ANGELES, CALIFORNIA, ASSlEGNOR F ONE-HALF TO SAMUEL QUARTER, OF LOS ANGELES; CALIFORNIA.

PISTON.

Application filed December 14, 1925. Serial No. 75,284.

This invention relates to that type of internal combustion engine pistons shown in my application, Serial No. 598,153, filed October 31, 1922,' for United States Letters- Patent for piston, in which thepiston is shown as having ia continuous peripheral slot separating the skirt portion from the head portion; the portions thus separated being connected to each other by webs that extend from the head portion to the wrist pin bosses so that the heat of the head portion will be transmitted to the skirt portion only through. said' webs and bosses which are subjected to the cooler air nside the 115 open end of the piston.

It is found in practicev that with sa1d type of piston a distortion occurs in the periphery of the separated skirt port1on, wh1ch causes two areas of heavy contact w1th the cylinder separated by areas of lighter contact on each side of the axis of the wrist P111.

An object/of this invention is to prevent such distortion and to maintain the cylindrical portions of the periphery in true form during engine operation.

This invention is broadly new, basic and pioneer in that I provide the cyli ndr1ca] portions of the piston on oppos1te sides of the axis-of the wrist pin with internal brldging and such bridging is preferably in the form of thin segmental ribs.symmetr1cally arranged on opposite sides of the plane in which the axes of the piston and wrist pin lie.

By this means the expansion of the arcs of the skirt that have heretofore been subject to said heavy contact with the cylmder, is controlled; and such ortions practicall maintain their conformity tothe cylindrical walls of the combustion chamber.

Other objects, advantages and features of invention may appear from the accompanying drawing the subjoined detailed description and the appended claims.

The accompanying drawing illustrates the invention.

Figure l isa side elevation of an internal combustion engine pistonconstructed in accordance with this invention with three bridges on each side of the axial planes of the cylinder and the wrist 'oin.

Fig. 2 is a view looking into the open end of the piston shown in Fig. i.

Fig. 3 is an axial section on line :5 Fig. 1.

Fig. 4 is a cross section on line :12, Figs. 1, 3 and 6.

Fig. 5 is a cross section on line w, Fig. 1. 4 Fig. 6 is an" elevation at right angles to Fig. 1, showing a slot at the lower end of the skirt.

Thepiston is shown provided at its head 1 with the usual peripheral packing ring grooves 2 the lowermost one of which is extended by aslot 3 to separate from the piston head 1 the skirt 4 that is provided with wrist pin bearing bosses 5, which are supported by internally arranged columns 6 extending from the head 1 to the wrist pin bosses 5, which they support, thus connecting the head 1 with the skirt 4:. The principal advantage of locating slot 3 .in the lowermost packing ring groove seat, is that the ring will partially seal the slot and prevent an unrestricted flow of lubricating oil through the slot from the cylinder Walls. The oil ring on apiston scrapes the cylinder walls and functions to remove the oil therefrom. Should the escape of oil be unrestricted, the upper walls of the cylinder will become dry and are subject to scoring by the piston proper. This is a ruinous condition that has been alleviated in the present invention by the provision of the peripheral slot located in the manner stated in con and the wrist pin bosses5, lie.

The skirt may or may not be provided'os with the longitudinal and transverse slots 9 and 10 to give freedom of expansion and contraction to thelower end of the skirt.

In Figs. 1 and 3 said slots are omitted and in Fig. 6' the slots are shown.

I claim.

l. A piston provided with wrist pin bearzoo ings; columns for supporting the bearings;

a rib integral with the piston head and the base of said columns and segmental bridging extending transversely of the shirt on op osite sides of a plane intersecting the co umns and adapted to control the distor- I tion of that portion of the piston skirt that is bridged during the period of unequal expansion and contraction of the head and skirt.

2. A piston havin a slot .separatingthe piston head from t e skirt of the piston V and having internal columns connecting the skirt with the head and segmental bridging extending transversely of the skirt on up x v posrte sids of a plane intersectlng the col- 10 umns andodapted to control distortion of that portion of the piston skirt that is bridged.

In testimony whereof, I have hereunto set my hand at Los Angeles, California, this 5th day of December, 1925.

GEORGE e. AUSTIN,

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