US2047788A

US2047788A - Piston for internal combustion motors

Info

Publication number: US2047788A
Application number: US625586A
Authority: US
Inventors: Elmer C Long
Original assignee: Individual
Current assignee: Individual
Priority date: 1932-07-29
Filing date: 1932-07-29
Publication date: 1936-07-14
Anticipated expiration: 1953-07-14

Description

July 14, 1936 E c, L NG 2,047,788

PISTON FOR INTERNAL COMBUSTION MOTORS Filed July 29, 1932 INVENTOR ATTORNEY Patented July 14, 1936 UNITED STATES Ass eerie];

PISTON FOR INTERNAL COMBUSTION MOTORS 4 Claims.

This invention relates to an improvement in pistons of the type generally made of aluminum alloys and pertains more particularly to pistons used in internal combustion motors in which the heat of the motor is an essential to be taken into consideration with respect to pistons of this character, the invention in this application being a furthering of the inventions contained in my co- .pending applications Serial Nos. 281,175 and 339,892 filed March '7, 1919 and November 22, 1919 respectively.

The primary object of the invention is to provide a piston of an improved construction with means whereby a part of the piston skirt will be held against normal expansion.

Another object of the invention is toprovide a piston with a structure extending from the head to a part of the piston skirt whereby expansion of the head will cause the skirt part to be held 20 against moving too far outwardly by expansion.

A further object of the invention is to provide a piston with a separated or cut away part in the periphery of the skirt with means extending from the head to the separated part which is made 25 coaotable on the part when the head is expanded by heat.

Other and further objects will appear in the specification and be specifically pointed out in the appended claims, reference being had to the ac- 30 companying drawing, exemplifying the invention,

and in which:--

Figure 1 is a side elevation of this improved piston.

Figure 2 is a vertical section taken approxi- 35 mately on the line 2-2 of Fig. 1.

Figure 3 is a vertical section taken approximately on the line 33 of Fig. 2.

Figure 4 is an end elevation of the piston. Figure 5 is an inverted horizontal section taken 40 approximately on the line 5-5 of Fig. 2.

Figure 6 is an inverted horizontal section taken approximately on the line 6-6 of Fig. 3.

Referring by numerals to the accompanying drawing, I designates the head of a piston having 45 a side wall 2 in which the packing ring recesses 3 are formed, and depended from the side wall 2 is a skirt 4, said skirt being larger in diameter across its thrust sides than is the diameter of the side wall 2 of the head.

50 The pin boss sides 5 of the piston are each provided with a pin boss I5 and extending across the head I interiorly thereof are a plurality of webs I, said webs at their ends extending downwardly to respective pin bosses and are formed integral with the head, the pin boss sides and the pin bosses. The skirt 4 on each of its pin boss sides is provided with a relief 8.

The skirt 4 on one of its thrust sides is provided with a separated or cut away part 9, said part 9 being formed by providing a slot or gap 5 Iii on the pin boss sides 5 of the piston adjacent and around respective pin bosses and said slots being oppositely disposed. The slots II] are intersected beneath respective pin bosses by a slot Illa which extends from the open end of the piston, 10 and the slots I0 at their upper ends joining the transverse slot I I which is formed in the side wall 2 0f. the head.

The cut away part 9 is supported in approximate peripheral alinement with the skirt 4 by a bridge structure I2, said bridge structure comprising an arcuate wall l3 extending from the pin boss sides 5 of the piston on the interior thereof and also being connected with respective pin bosses 6, said wall It extending longitudinally in the piston and being joined to the cut away part 9 by a pair of diverging webs M.

The wall it and the inclined webs l4 connecting said wall and the cut away part 9 of the skirt 4 in the casting operation of the piston are extended to the head I of the piston as shown in Fig. 3 and in machining the piston, the gaps I0, Illa and adjoining transverse slot I I are made, the cutting operation when making the transverse slot II cutting through the arcuate wall I3 and joining webs l4 (see Figs. 3 and 6).

The extending of the wall l3 and the webs I4 to the piston head I and the arrangements of the plurality of webs l from the head to the pin bosses, provides a piston which can be readily die-cast with simplicity owing to the fact that means are provided for the dropping or withdrawing of cores from the molded piston.

After the machining or finishing of the piston and the skirt of the piston has been finished to 4 an approximate .002 clearance for fitting the piston in the cylinder of an internal combustion motor, the close clearance given is sufficient to prevent piston-slap of the piston in the cylinder in the starting of the motor or when the motor is running cold. Upon heated conditions within the cylinder, the head I by reason of receiving the expanding burning thrusts from gaseous charges will obviously receive a maximum of heat and consequently have maximum expansion. As the head expands, the opposing pin bosses 6 being connected with the side wall 2 of the head I will be moved outwardly with the expanding forces of the head and as the arcuate wall I3 is connected to the pin boss sides of the piston and the pin bosses, the outward movement given to the pin bosses from the head will tend to straighten or lengthen the Wall l3 and in so doing will pull the intermediate portions of the wall towards the pin bosses and as the wall I3 is connected to the cut away portion 9 by the webs M, the portion 9 will be pulled inwardly rather than be permitted to be moved outwardly.

The holding in or pulling in of the cut away part 9 of the skirt 4 during expansion of the piston and particularly the head of the piston will obviously eliminate and consequently prevent any excess expansion of the skirt on a diameter across the thrust sides of the piston and therefore there will be no seizing of the skirt in the cylinder as the skirt on the pin boss sides 5 is relieved as indicated at 8.

Attention is called to the inclination of the webs Hi from the arcuate wall I3. This is for the purpose of causing the end portion l5 of the cut away part 9 to be held or pulled inwardly during the expanding of that portion of the cut away part 9 between the points of connection of the webs I4 therewith.

Oppositely disposed in the skirt 4 from the cut away part 9 is a part l6, said parts forming thrust sides in the skirt, the part it difiering from the part 9 in that the part 9 is entirely cut away from the skirt and whereas the part H5 is integral with and depends from the side wall 2 of the head as shown at I! in Figs. 1, 3, and 6. Inasmuch as the part i6 is cut away from the part 9 by the slotting l and Illa, reinforcing means in the form of webs l8 are extended from the pin bosses 6 to the part l6, there being a web is from each pin boss to the part IE5. While the part Hi depends from the portion ll, the portion I1 is made relatively narrow in circumferential length by the transversely extending slotting H a on each pin boss side of the piston, said slottings I la extending from the slottings 10. This is for the purpose of making the part 16 yieldable for permitting free expansion and contraction of said part under thermal conditions.

Obviously constructional modifications of the device are possible without departing from the spirit of the present invention and therefore it is to be understood that it is not necessary to limit the invention by the terms used in the foregoing description, excepting such as the state of the art may require.

What I claim is:--

1. A one-piece piston comprising a head having a side wall and a skirt having opposed thrust sides, one of the thrust sides being separated from the side wall of the head and the other thrust side being continuous with the side wall of the head, opposed pin boss sides depending from the side wall of the head and separated from the thrust sides of the skirt, a pin boss extending from each pin boss side, a transversely extending wall joined at its ends with respective pin bosses, and connectors extending from said wall to the separated thrust side of the skirt.

2. A one-piece piston comprising a head having a side wall and a skirt having opposed separated thrust sides, one of the thrust sides being separated from the side wall of the head and the 10 other thrust side being continuous with the side wall of the head, opposed pin boss sides depending from the side wall of the head and separated from the thrust sides of the skirt, a pin boss extending from each pin boss side, a transversely extending wall joined at its ends with respective pin bosses, a pair of connectors joined with and diverging from said wall and being connected at their extending ends with said disconnected thrust side of the skirt, and supporting means extending from each pin boss to the other thrust side of the skirt.

3. A one-piece piston comprising a head having a side wall and a skirt having opposed separated thrust sides, one of the thrust sides being disconnected from the side wall of the head and the other thrust side being continuous with the side wall of the head, opposed pin boss sides depending from the side wall of the head and separated from the thrust sides of the skirt, a pin boss extending from each pin boss side, a transversely extending arcuate wall joined at its ends with respective pin boss sides and respective pin bosses, a pair of walls joined with and diverging from said arcuate wall and being connected at their extending ends with said disconnected thrust side of the skirt, and supporting means extending from each pin boss to the other thrust side of the skirt.

l. A one-piece piston comprising a head having a side wall and a skirt having opposed separated thrust sides, one of the thrust sides being disconnected from the side wall of the head and the other thrust side being continuous with the side wall of the head, opposed pin boss sides depending from the side wall of the head and separated from the thrust sides of the skirt, a pin boss extending from each pin boss side, a transversely extending arcuate wall joined at its ends with respective pin boss sides and respective pin bosses, a pair of walls joined with and diverging from said arouate wall and being connected at their extending ends with said disconnected thrust side of the skirt, and a web connecting each pin boss to the thrust side of the skirt which is continuous with the side wall of the head.

ELMER C. LONG.