US1698074A - Device for reducing piston slap in internal-combustion engines - Google Patents

Description

Jan; 8, 1929. 1,698,074

" D. M. SOLENBERGER DEVICE FOR REDUCING rzsron SLAP m INTERNAL COMBUSTION ENGINES Filed Sept. 26, 1927 nunto a Jean /'Zv Salenbey er Patented Jan. 8, 11929.

UNITED sr TES PATENT OFFICE.

DEAN M. SOLENBERGEB OF CLEVELAND, OHIO, ASSIGNOR TO THE SIMPLEX PISTON RING COMPANY OF AMERICA, INC., A CORPORATION OF OHIO.

DEVICE FOR REDUCING PISTON SLA P IN INTERNAL-COMBUSTION ENGINES.

Application filed September 26,1927. Serial No. 222,095.

.ton together with means for exerting a preponderance of radial pressure between the ring and one side of the piston whereby said piston is held in closer contact with the opposite side of the cylinder.

The present invention is a construction of this general character in which the preponderance of pressure as between the ring and one sideof the piston is produced by. the use of an eccentric ring in connection with a cor rugated ribbon expander and located in a groove of uniform depth in the piston as hereinafter set forth.

Inthe drawings: Figure 1 is a horizontal-section through an engine cylinder and'the piston.

Figure 2- is a vertical section therethrough showing portions in elevation.

In thepresent state of the art piston rings reinforced by corrugated ribbon expanders located in the ring groove have been extensively used. 3 Where there is uniformity in the depth of the ring groove in the thickness of the ring and in the distributed radial pressure of the expander, a loose fitting piston will be centered with respect to the axis of the cylinder. This will notalways however, cf fectively prevent piston slap as the alternate pressure to one side or the other produced by the angularity of the rod may set up an oscillation which may be reinforced rather than retarded by the resiliency of the expander. If, however, there is a suflicient preponderance of pressure in one direction, the slap.- ping of the piston may be eliminated;

With the present invention this preponderance of pressure is developed through the use of an eccentric ringtogether with a uniformly corrugated ribbon expanderl' vThering is so proportioned that on one side the corrugations of the expander are but slightly deformed whereas on the diametrically opposite side these corrugations are highly compressed. Also the proportioning of the parts is such that they may be applied to the ordinary ring groove of a piston without alteration. Thus as shown A is the eccentric ring of pressure in one direction.

to exert a and B the corrugated ribbon ex ander both being located in the groove 0 of t e piston D. 7

As shown in Figure 1 the portion of the ring A of greatest radial thickness occupies the greater portion of the space within the ring groove so that the corrugations of-the expander B adjacent thereto are nearly fiattened out. Onthe other hand the corugations of. the expander adjacent to the radially thin portion of the ring are but slightly deformed. This results in pressing the piston in the direction indicated by the arrow againstthe cylinder wall and with sufiicient preponderancein pressure to lessen or en-- I tirely eliminate slap.

To increase the preponderance of pressure on one side of the piston I may employ a plurality of rings similarly formedand with very thick and thin portions respectively in ahgnment with each other. Thus, as shown portion in'vertical alignment with the thick portion of the ring A and its thin portion '75 in Figure 2 the second ring A. has its thick also in vertical alignment with the thin portion of said ring A. To avoid alignment of the gaps produced by trans-splitting the ring I preferably arrange these at a point inter- :mediate the thick and thin portions of the ring as indicated at E Figure 1. Thus rings of the same construction but reversed from bottom to top will bring these gaps E and E in. the two rings upon diametrically opposite sides of the piston.

What I claim as my invention is:

1. The combination with a cylinder,.of a piston loosely fitting the same and rovided with a ring groove, a corrugated ri bon ex pander located in said groove and a transsplit ring in said groove having a greater radial thickness on one side than on the diametrically opposite side whereby said expander is tensioned toexert a preponderance 2. The combination with a cylinder, of a piston loosely fitting the same and provided with a ring groove, of uniform depth, a corrugated ribbon expander located in said groove and a trans-s lit eccentric ring also said groove where ysaid expander is 1381181011611 preponderance of pressure on one side of the piston.

3. The combination- .with a cylinder, of a' piston loosely fitting the same and provided with a plurality of ring grooves, corrugated ribbon expanders in said grooves and trans- 1o ribbon expanders in said grooves and rings split rings in said grooves having greater radial thickness on one side than on the diametrically opposite side thereof and with the thick sides and the thin sides of the several rings respectively in alignment whereby said expander is tensioned to exert. preponderance of pressure on one side.

4; The combination with a cylinder, of a piston loosely fitting the same and provided with a plurality of ring grooves, corrugated in said grooves having a greater radial thickness on one side than on the diametrically opposite side, the thick and thin portions of the several rings being respectively in vertical ali out and said rings being trans-split intermediate the thick and thin portions thereof with the splits in adjacent rings out of vertical alignment.

In testimony whereof Iafiix my signature.

DEAN M. SOLENBERGER.

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