US1466679A - Engine piston - Google Patents

Description

C. H. TAYLOR Sept. 4, 1923.

ENGINE PISTON Filed Oct, 6, 1919 2 Sheets-Sheet l Sept; 4, 1923.

c. H. TAYLOR ENGINE PISTON Filed Oct. 6, 1919 2 Sheets-Sheetl 2 Patented Sept. 4, 1923.

CECIL H. TAYLOR, 0F DETROIT, MIHIGAN'.

ENGINE PISTON.

Application led October 6, 1919. Serial No. 328,788.

To all whom it may concern Be it known that I, CEoiL H. TAYLOR, a citizen ofthe United States of America, residing at Detroit, in the county of Wayne and State of Michigan, have invented certain new and useful Improvements in Engine Pistons, of which the following'is a specification, reference being had therein to the accompanying drawings.-

The invention relates to engine pistons of the type in which the body ofthe piston is formed of pressed sheet metal, and it is the object of the invention to obtain a structure having various advantages as hereinafter set forth. Y

In the drawings:

Figure 1 is a central longitudinal section through a piston embodying my invention; Figures 2, 3 and 4 are similar views showing modified constructions;

'Figures 5and 6 are,respectively, central sections and plan View of a piston body blankishowing the manner of reinforcing the saine'` Figures 7 and 8 are central longitudinal sections in transverse planes showing still other modifications;

Figure 9 is a section similar to Figure 1 showing another modificationz L In the design of engine p1stons 1t 1s essential; first, to provide a cylindrical portion for fitting the walls of the engine cylinder and for carrying the sealing rings; second, a head which receives the direct pressure of the gases within the cylinder; and

third, bearings for the wrist pin which couples with the pitman-rod ex'tendlng to the crank. For forming the cylinder-engaging portion cast metal', and particularly cast iron, has been found to be well adapted. This material is not, however, as great 1n tensile strength as wrought metal and I, therefore, preferably formmy improved piston of a com site structure 1n which a cast metal ,skirt 1s combined with a pressed metal body. It is, however, absolutely essential that these parts be strongly united to each other, so as to withstand not only the pressure .of gases within the cylinder, but.

also inertia stresses-which at `high speed, are even greater, thank-the gaseous pressure. 'Ihis I have accomplished by forming the skirt as an annulus of relatively small mass surrounding" Va cup-shaped pressed' sheet metal- 'structure forming the b ody of the pistomvthe two parts being mtergraded,

preferably by welding. The pressed sheet metal body has attached thereto the bearings for the wrist pin, preferably by welding, and suitable reinforcements are preferably provided for transmitting the stresses from the head to the bearings.

. In detail and as shown in Figure 1, A is a pressed sheet metal cup-shaped body which is surrounded by the annulus B having a cylindrical skirt C with grooves D therein for receiving the piston rings. There is also provided an inwardly-extending flange E which lits against the pressed sheet metal body and is integrally united thereto by welding, as indicated at 'F whereby -an unbroken smooth surface for the head of the piston is obtained. TheV body A is formed with side walls A thereof extendin into contact with the wrist pin lbearings in a plane intermediate the ends of said bearings. Thimble flanges H may be pressed integral with the body to form a more extended contact for the bearing G andthe parts may.

then be welded, as indicated at I. Where further reinforcement is required, .a web J may be arranged in the central plane of the body and the bearings Gr and secured by welding. This web is preferably cut away at J to lighten the same.

In the construction shown in Figures 5 and 6, a reinforcing web is formed integral with the pressed sheet metal 'body by so drawing said body as to 'form the transversely folded portions K and K. With the construction as show n in Figures 7 and 8 the pressed sheet metal body is flared downward to form segmental bearings L and L on opposite sides of the cylinder in the plane of movement lof the pitman-rod. Between these se ents the body is flattened, as indicated at so as to leave a space between the walls and the cylinder and also to bring the plane of connection with the wrist pin bearings intermediate the ends thereof. The advantage of this construction is that the bearings are kept cool by contact with the air on all sides thereof, and reduction in unloaded friction surface.

The annulus B may be united with the pressed sheet metal body in various ways. Thus, as shown inFigure 1 the flange E merely abuts against the cup-shaped body and isfsecured by welded metal filling the V-shaped groove. In Figure 2 the flange E is provided with a down-turned portion E abutting against a shoulder E2 on the body and the Welded metal is lled into a V- shaped groove F. in Figure 3 the ange E engages a beveled portion N of the sheetstructure, O is a pressed sheet metal skirt' which is Welded to the pressed cup-shaped sheet metal body, and P, P are cast metal rings Welded thereto to form intermediate the same the grooves D for the piston rings. rlFhe rings P, P may be successively positioned on the member O and welded thereto, in that Way avoiding interference with each other during the Welding.

Whatl claim as my inventionr is:

1. Alpiston comprising a pressed sheet metal body having an integral head of smaller diameter than the cylinder, and a skirt of different metal for fitting the cylinder having an inwardly-extending iange the inner peripheral face of which is welded to said body.

2. A piston comprising a pressed sheet metal body cupped to form an integral head of smaller diameter than the cylinder, a skirt of different metal for fitting the cylinder surrounding said body and having an resem@ inwardly-extendng flange integrally united around the inner peripheral face thereof to the Wall of said cupped head.

3. A piston comprising a pressed sheet metal body cupped to form an integral head of smaller diameter than the cylinder, an annular skirt of different metal for iitting the cylinder integrally united around the inner periphery thereof to said body, and Wrist pin bearings intersecting said body intermediate their ends and rigidly attached thereto.

4; Ag piston comprising a pressed sheet metal body having a cupped end portion of smaller diameter than the cylinder with a flaring lower end forming diametrically opposite segments for fitting the cylinder with flattened side. Walls connecting said segments, an annular skirt integrally united around the inner periphery thereof to the cupped end portionv of said body, and Wrist pin bearings secured to said iattenedside Walls.

5. A piston comprising a body having a reduced head, a skirt surrounding said head and having a flange secured to said/ head, said skirt being spaced from said head a distance corresponding to the Width of said flange. s

1n testimony whereof l aHiX my signature.

' onori, n.' ramon.

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