US1548609A - Piston ring - Google Patents

Description

Aug. 4, 1925. 1,548,609

J. O. JUSTICE PISTON RING Filed May 29. 1923 J 0 Ja state,

cogee and State of Patented Aug. 4, 1925.

PATENT OFFICE.

JOHN OSLIN JUSTICE, OF COLUMBUS, GEORGIA.

"Heron RING.

Application flled flay 29, 1923. Serial m. 642,292.

To all whom it may concern:

Be it known that I, JOHNOSLIN JUSTICE, a citizen of the United States of America, residing at Columbus in the county of Mus- (iveorgia, have invented new and useful Improvements in Piston I as -'Rings, of which the following is a specification.

The object of the invention is to provide a piston ring consisting of main and supplemental elements cooperatively related so as to provide for extension of the ring laterally to adjust itself to oversize or old or worn ring grooves so that it may obtain a firm and perfect seating or fitting engagement in the oove.

A further object is to provide an expander in connection with the ring whereby lateral movement of the piston in the cylinder is prevented which results in what is commonly known as piston slap.

With these objects in view the invention consists in a construction and combination of parts ofwhich a preferred embodiment is illustrated without defining the limits of the invention.

Figure 1 is a side elevational view of the piston employed with the improved ring, the cylinder wall being shown in section.

Figure 2 is a vertical sectional view on an enlarged scale on the line 2-2 of Figure 1.

Figures 3 and 4 are respectively perspective views of the ring elements.

Figure 5 is a perspective view of the expander.

F"gure 6 is a perspective view of the lap joint at the connecting ends of the main element of the ring.

The ring consists of the main element 1 and the sup lemental element 2 both of which are spht to provide for the radial expansion of the ring to contact with the cylinder wall 3, the ring being carried in the usual groove of the iston 4.

The main ring 1 15 in reality the working rin being disposed against the u per wall of t e piston groove and on that side or face perpendicular with the peripheral face of the ring. On the opposite face or side, the working ring is beveled as indicated at 6 to provide an acute angle between the lower side of the ring and the peripheral face so that this side is inclined away from the bottom of the piston groove in the direction of the axis of the piston.

The supplemental ring 2 is in reality a jamb ring and its outer periphery'is' normally within the outer periphery of the Working ring, the jamb ring having an inclined side face 7 forming an acute angle with the inner face of the jamb ring and having contact with the inclined face 6 of the working ring. vThe bottom face of the j amb ring is square with the peripheral face and engages the lower side wall of the piston groove. Obviously radial expansion of the jamb ring will, by virtue of the contacting bevel faces 6 and 7, increase the effective width of the ring as a whole so that firm contact with the upper and lower side walls of the piston grooves is effected. The outer diameter of the jamb ring being 'less than thecorresponding diameter of the working ring, provides for considerable radial expansion of the former without contact with the cylinder wall. Thus the ring as a whole may be made to seat firmly in piston grooves of varying widths which will be found as a result of wear.

The workin ring is. provided with a la joint and at the meeting ends is expands laterally to substantially equal the Width of both itself and thejamb ring, one extremity being formed with an offset tongues overlapping the ton ue extension 9 onthe other extremity whic however, is provided with a lateral extension 10 substantially equal to the width of the jamb ring. The tongue 8, however, is reduced in thicknessby removal of a portion of the stock from the inner periphery, so that this tongue may ongage in a seat 11 formed in the lateral extension 10 beside the tongue 9, this seat being provided by removal of stock from the outer periphery of the terminal of the workmg ring.

The circumferential length of the jamb ring is reduced by the removal of a section to provide a clearance space for the ofiset tongue 8 and the lateral extension 10.

In order to expand the rin s, an expander is provided common to oth rings. This expander consists of a spring 12 formed with alternate arched and straight portions '13 and 14, the expander being in the form of a splitring to provide for radial extension. Longitudinally the expander is split on a centerline as indicated at 15 to providetwo spaced parallel spring elements which are connected together at the terminals of theexpander, the longitudinal split being terminated shortof the extremities of the sprin Thus-"one of the parallel elements of t e expander against the working. ring and the other against the jamb ring, the former being expanded rad ally for firm contact with the cylinder wall and the latter radially expanded for. the lateral expansion of the ring as a whole-Idue to the cam action between the bevel faces 6 and 7 of the working and jamb-rings.

Since the construction firm seating of the working ring against the upper side wall of the piston groove, the working ring may be ground at the surface to secure perfect contact with the upper wall of the groove, even though the groove be materially worn. Since the outer periphery of the jamb ring does not contact with the cylinder wall, a pocket is provided in the ring groove bounded by the lower edge of the working ring, the periphery of the jamb ring and the lower side walls of the cylinder groove, this pocket serving as an oil pocket for any excess oil from an cause and since the upper wall of the 011 pocket is defined by the lower beveled edge of the working ring, this beveled edge more effectively wipes off the oil from the cylinder wall than if it were square or perpendicular with the latter.

Having described the invention, what is claimed as new and useful is 1. A device for the purpose indicated comprising a working ring and a jamb ring having cooperative camming surfaces, the working ring being radially expansible and having a lap joint consisting of overlapping tongues the combined width of which is equal to the width of the working ring bears provides for the.

and the jamb ring, the jamb ring having a section removed to provide clearances ace for the overlappin joint of the wor mg ring,;and a radia expander common to both-rings.

2. A device for the purpose indicated comprising a working; ring and a 'amb ring having cooperative camming sur aces, the main ring being provided with a lap joint consisting of overlapping tongues of which one is formed in extension of the working ring and the other offset therefrom, said working ring bein provided with a lateral extension, said oiset tongue and lateral extension being respectively reduced in thickness on the inner periphery and outer periphery to provide a seat in the extension for the reduced portion of the-offset tongue, the combined width of the tongues approximating that of the main ring and jamb ring and the latter having a section removed to provide clearance space for the lateral extension and the offset tongue.

3. A device for the (purpose indicated comprising working an jamb rings of which the latter'is of less radial extent than the former, said rings being provided with cooperating camming surfaces to effect relative lateral movement on radial expansion of the jamb rings, and an expander consisting of alternate arched and straight portions, theexpander'being split on a longitudinal center line to provide two spaced parallel spring elements bearing re ctively on the inner peripheries of the wor ing and jamb rin s.

In testimony whereof he aflixes his signature.

JOHN OSLIN JUSTICE.

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