SU37951A1 - Expansion device for piston rings - Google Patents

Description

Piston rings are a particularly important part of the engine, at the same time the most difficult to perform. The need for combination in the manufacture of a piston ring of sufficient strength and the same spring action requires that the technological process be carried out with great care; Moreover, the specific chemical composition of the rings and the hardness tests do not determine their elastic properties and are only a relative criterion for evaluating their future work on a twin. The rings are strong enough, but weakly elastic, cause when the engine is running, heavy smoking, ejection of oil, an increase in the consumption of the latter and, ultimately, burn and break. Relatively soft rings are obviously weakly elastic and show similar disadvantages. Excessively high elasticity causes premature wear of the ring and the working surface of the cylinder, thereby increasing friction losses.

The present invention, related to spacers to piston rings using a coil spring, has a purpose; 1) the exclusion of marriage in the manufacture of piston rings, which is attached only to the necessary and sufficient strength at)

this chemical composition of naturally obtained elasticity; 2) increase the service life of the piston ring, and 3) simple structural design of the spacer is possible, which would allow it to be easily applied to already existing piston and ring designs.

In FIG. 1 is a graph illustrating the theoretical rationale for the proposed fixture; FIG. 2- a cross-section of the piston with a spacer installed; FIG. 3 - longitudinal section of the piston on the DM; in fig. 2, and FIG. 4 is the same, otherwise.

The proposal is based on the principle of increasing the elasticity of the ring with the help of tangential forces applied at the ring lock from the spring located there. Normally and satisfactorily working ring creates at each point of its contact with the working surface of the cylinder equal efforts P (Fig. 1), pressing the ring against the wall of the cylinder. These forces are known to be achieved by cutting in the ring. On the basis of the rules of theoretical mechanics, these forces P can be replaced for each half of the ring (relative to the cutout) by one force passing through a given point

application, and one pair. Thus, we will have in the ring ring two forces -P / and P / and two pairs -P / and P / P / P /, equal and opposite to each other in sign. Id in the reverse order, i.e. applying the forces P / and Pg in the ring of the ring, obtain an identical picture, namely, the force P around the circumference of the ring. Thus, by applying force and P /, it is possible to create a condition of a normally and satisfactory working piston ring.

FIG. Figures 2 and 3 depict a piston ring 5 mounted on the piston 6 of normal construction and having recesses A at its lock, into which the thrust pins 1 are inserted with beveled end parts 1. The thrust pins 1 create above-curved forces and PZ. These forces are obtained from the coil spring 4, which rests on the adjusting washers 2 and the pins 1. The spring 4 and the pins 1 are placed in the guide sleeve 3, pressed into the piston casing 6. The notches A are made in the compressed state of the ring. For the case depicted in FIG. 2 and 3, the thrust pins of the right tool rest on two rings at once, and of the left pivot on one ring. When designing the structures of the rings, the spring 4 and the pins 1 are placed in the piston, as shown in FIG. four.

The subject matter of the invention.

The expansion device for the piston rings using a coil spring, characterized in that the stops for the coil spring 4 are made in the form of pins 1 with washers 2 placed in the guide sleeve 3 and skirchennym parts entering the recesses A, selected at the ends of the ring 5 .

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