US1506253A - Piston - Google Patents

Description

Aug. 26 ,1924. 1,506,253

A. PONDELICK PISTON Filed May 51 1923 Patented Aug. 26, 1924.

UNITED STATES ANTON PONDELICK, OF CHICAGO, ILLINOIS.

PISTON.

Application filed May 31,

To all whom it may concern:

Be it known that I, ANTON PONDELICK, a a

citizen of the United States, and a resident of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Pistons, of which the following is a specification.

My invention relates'to pistons, partlcularly to pistons for use in explosive engines. My invention may be considered as an improvement on the structure disclosed in my co-pending application Serial No. 531,069, filed January 23, 1922, in which construction the piston body is composed in greater part of lighter metal such as aluminum or aluminum alloy intimately surrounded by bands of heavier metal such as cast iron which reenforce the structure and which take up the wear.

Unless the bands or rings are intimately interlocked with the material in the piston body against lateral, radial, and turning movement they may become displaced as the piston rapidly travels and cause the destructive wearing of the cylinder walls, or to bind. Such binding would of course tend to loosen the bands'still more and then they would still further interfere with proper operation and would cause the engine to become noisy. Tn structures such as disclosed in Werra Patent No. 1,195,305 of August 22, 1916, where the bearing rings are of increased diameter, T have found that such rings soon start to rattle and to wear un evenly so that the engine becomes noisy in a very short time. An important object of my invention is therefore to provide improved arrangement for intimately interlocking the bearing bands or rings with the piston body so that there fwill be no chance for relative movement in any direction.

Another object is to provide animproved arrangement for intimately interlocking with the piston body the bushings which journal the connecting rod wrist pin so that these bushings cannot become loosened.

My improved construction and arrangement is fully disclosed on the accompanyin drawing in whichig. 1 is a side elevational view,'partly in vertical diametral section,

2 is a sectional view on plane 2--2,

3 is a'plan view of a bearing ring,

Fig. 4= is an end view of one of the bushings, and

1923. Serial No. 642,442.

Fig. 5 is a side view. of the bushing.

The body 10 of the piston structure has the radially inwardly extending bearing lugs 11 and 12 for the connecting rod wrist pin.

The body is of aluminum or other light weight metal and at its upper end has the usual peripheral notches 13 for the piston for packing rings, the application of which is well known in the art. Near its lower end the body has the rectangular groove or channel 14 which extends entirely around the body and receives the bearing ring 15. This bearing ring is placed in the mould before the aluminum is cast therein. and the ring will then be intimately surrounded by the aluminum. To intimately interlock the ring with the body I provide tongues and grooves suitably arranged toprevent relative movement in any direction. As shown the upper and lower walls of the channel 14 have the annular ridges or tongues 16 and 17 and the transverse ridges or tongues 18. The ring on its upper and lower sides has corresponding annular grooves 19 and 20 and transverse grooves 21. The tongues are of course formed in the body when the aluminum'is cast and the grooves of the rings will then receive the tongues and the rings will be intimately interlocked with the body and prevented from moving relatively either laterally or radially or turning.

Below the piston ring grooves 13 1 provide a groove 22 for a wearing ring 23 which is intimately interlocked with the piston body in the same manner as is the ring 15. After casting of the body around the bearing rings the structure is machined and the bearing rings are given a slightly greater diameter in' order that they alone will have bearing engagement with the cylinder sides. By thus intimately interlocking the bearing rings with the piston body they can never work loose or become displaced and the engine will always operate without noise and the friction will be reduced to a minimum.

In the bearing lugs 11' and 12 for the wrist pin are inserted bearing bushings 24 which are also intimately interlocked against any relative movement with reference to the body. As shown these bushings do not extend entirely outwardly through the lugs and in their outer ends they are provided with an annular groove 25, and on their cylindrical faces with helical grooves 26, into which grooves the aluminum engages during the casting operation to form tongues I thus provide a very simple, efficient and,

durable piston structure which is very light and which retains its reenforcing' bearing rings in proper position and holds them against any displacement.

I do not desire to be limited to the exact construction and arrangement shown and described, as modifications can be made which will still come within the scope of the invention.

I claim as follows:

1. In a piston structure, the combination of the cylindrical body having a circumferenti-al channel of rectangular cross section, longitudinal and transverse tongues extending from the upper and lower walls of said channel, a bearing ring in said channel, and longitudinal and transverse grooves in the upper and lower faces of said ring for receiving said longitudinal and transverse tongues whereby to lock said ring against lateral, radial, and turning movement.

2. In a piston structure, the combination of the cylindrical body having a circumferential channel, a closed bearing ring fitting in said channel, means for interlocking said .of said ring, said ring being of heavier metal and said body being of lighter metal cast around said ring whereby the metal of the body will form tongues for engaging in the grooves of the ring to thereby lock said ring to the body against radial, lateral, and turning movement.

4. In a piston, the combination of the cylindrical body, radial bearing lugs extending inwardly from said body, bushings in said lugs, there being an annular groove in the outer end of each bushing and helical grooves on the cylindrical sides thereof, said body being cast around said bushings whereby the metal will flow into said grooves to thereby interlock said bushings with the body against lateral and turning movement.

In witness whereof, I hereunto subscribe my name this 28th day of May, A. D., 1923.

ANTON PONDELICK.

Images