SU1760145A1 - Piston ring - Google Patents

Abstract

The invention relates to engine building. The ring consists of an L-shaped ring segment made of steel tape, a polymer filler and a spiral expander. The edge of the lower shelf of the segment is a scraper, and the vertical shelf consists of alternating solid surfaces and openings. The expander has unpolished and ground sections. Last he rests on the surface of the segment. The proposed design ensures uniform wear on the working surface. 2 hp f-ly, 5 ill.

Description

FIELD OF THE INVENTION The invention relates to engine-making, namely to structures of piston rings.

Known piston hoop with a conical working surface, made of special grades of cast iron 1J.

The disadvantages of the known piston ring include:

uneven wear of the ring surface around the perimeter (more in the area of the lock) caused by increased specific pressure in the area of the lock, since mainly piston rings, which are blackened by a copier, have a pear-shaped shape, radial pressure diagrams;

a change in the specific pressure on the wall of the cylinder during operation, caused by a gradual change in the height of the contacting working surface;

the need to use precise special equipment for casting and machining.

It is also known to have a piston ring made of a polymeric material and a metal expanding ring, separate parts of which are introduced into the polymeric material during the formation of 2J.

The prototype eliminates a number of deficiencies inherent in the analog:

a number of complex equipment (for foundry and mechanical processing) is not required for the manufacture of rings of a polymer material and a metal expansion element;

ring has a low specific consumption of materials.

However, it also has disadvantages:

the extrusion of the polymer filler under the action of gases and the transfer ring in the groove of the piston, i.e. reshaping under load under normal or high voltages;

wear of polymeric materials on the upper end of the ring;

uneven pressure of the worker on the wall of the cylinder, since Mostly such rings are made with a pear-shaped radial pressure diagram, otherwise the ring will have a low

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ring pressure on cylinder wall

The invention's durability is increased durability and uniform wear.

This goal is achieved by the fact that in a piston ring made of polymer filler and an annular element made of steel tape, some parts of which are embedded in a filler, the ring element is made in the form of an L-shaped ring segment, the outer edge of the lower flange of which is a scraper and the vertical the shelf is formed by alternating solid surfaces and openings formed by vertical ridges bent to the outer diameter.

The ring is provided with a spiral-type expander with ground and alternated ground and non-ground sections alternating around the perimeter.

The expander with ground sections is supported on the internal solid areas (surfaces) of the vertical flange.

Such a ring design eliminates the phenomenon of extrusion of the filler from the ring, and also reduces the end ring wear. Vertical bridges increase the ring stiffness and prevent it from twisting.

The uncoated areas present in the expander exclude the possibility of displacing the expander relative to the ring.

1 shows a cross section of a ring mounted in a piston groove; figure 2 is an annular element of steel tape, made in the form of an L-shaped segment in the isometry; FIG. 3 shows a spiral expander having ground sections; figure 4 - the proposed ring in the plan; figure 5 - ring with expander in isometric,

Piston ring consists of a ring L-shaped segment 1 of steel tape, polymer filler 2 and spiral expander 3

The outer edge 4 of the lower flange 5 of the steel segment 1 is a scraper, and the vertical shelf 6 consists of alternating continuous surfaces 7 and openings 8 formed by vertical ridges 9 bent to the outer diameter.

Holes 10 are made on the vertical shelf 6 and the vertical lintels 9 to improve the adhesion of the polymer filler 2 to the annular segment 1. The vertical lintels increase the rigidity of the ring and exclude the possibility of its twisting.

As the polymeric filler, for example, polytetrafluoroethylene, chlorotrifluoroethylene, vinyl and fluoride, hexafluoropropylene, vinyl fluoride, nylon, silica resin can be used.

The spiral expander 3 has alternating unprocessed 11 and ground 12 sections, with ground sections 12 it abuts against internal vertical solid surfaces 7 of the annular segment 1.

The uncoated areas 11 of the expander 3, resting at the end 13 of the vertical solid surfaces 7 of the shelf 6, prevent the expander 3 from moving relative to the annular segment 1.

The ring works as follows.

During operation, when the piston 14 moves downwards, the ring with vertical jumpers 9 abuts against the wall 15 of the piston groove 16, which eliminates the effect of squeezing the filler out of the ring, reducing its end wear. At the same time, the vertical jumpers increase the rigidity of the ring and exclude the possibility of its twisting, i.e. under the action of pressure arising in the annular space, the ring has

a slight deformation, which allows to reduce the gap ring-groove and thereby increase the compression properties of the ring and reduce wear on the ends.

At the same time, during operation, uniform wear occurs on the working surface due to the presence of a spiral dilator. The spiral expander, with its ground sections 12, rests on the inner vertical solid surfaces 7 of the segment, creating a uniform specific pressure of the ring on the wall of the cylinder 17. The magnitude of the working outer edge 4 of the ring remains constant even during wear. wear

The ring goes only in the radial direction. The uncoated areas of the expander 11 abut against the end 13 surfaces of the vertical solid surfaces 7 of the ring 1 and prevent its displacement.

relative to the ring 1, which also creates a constant specific pressure of the ring on the wall of the cylinder 17 and ensures uniform wear of the ring around the perimeter.

Compared with a serial ring of a similar purpose, the claimed design provides uniform wear on the working surface, and also allows to increase its lifespan from 8-10 thousand hours to 16 thousand hours.

Claims (3)

1. A piston ring made of a polymer filler and an annular element made of steel tape, some parts of which are embedded in a filler, that is, in order to increase durability, the annular element is designed as an L-shaped ring segment, the outer edge of the lower the shelves of which is a scraper and the vertical shelf is formed by alternating continuous surfaces and openings, about developed bent to the outer diameter of the jumpers. 2. The ring according to claim 1, characterized in that. that, in order to achieve uniform wear by creating a uniform specific pressure, the ring is provided with a spiral-type expander, with grinded and non-grinded portions alternating around the perimeter. 3. The ring according to claim 2, characterized in that the extender with the ground sections rests on the inner solid sections of the vertical flange. fig 2 five s fg / g3 fae. four