CN2317319Y - Combined piston ring - Google Patents

Abstract

The utility model belongs to an engine component, and specifically is a combined piston ring used for engines. The purpose of the utility model is to improve the service life of the piston ring. The utility model comprises a combined piston ring which is formed by that two piston rings are overlapped together, each section of the two piston rings is respectively trapezoidal, the whole section of the slope portions of the two piston rings after overlapped is quadrate, and the openings of the two piston rings are overlapped in the staggered mode; a surface which is processed by chromium plating improves the abrasion resistance, the other surface is worn endlessly and can compensate the side gap variation caused by the wear, thereby, the service life of the piston ring can be prolonged.

Description

Compound piston ring

The utility model relates to the piston ring in a kind of cylinder.

At the motor casing top half because of being subjected to high temperature in the cylinder, the influence of motion of hyperbaric environment high speed and lubricated difficulty, shorten the working life of piston ring, can improve its wear-resisting property and its life-span is significantly improved by carry out chromium plating on the surface of piston ring in the prior art, but wear of piston-rings is still inevitable, the result of wearing and tearing then makes piston ring side clearance further increase, the also corresponding increase of piston ring gap, the former will make motor produce the oil firing phenomenon, the latter will make pressurized gas scurry into crankshaft room, engine power descends, and machine oil quickens rotten, thereby has reduced efficiency of engine.

The compound piston ring that the purpose of this utility model is to design a kind of long service life and improves engine operation efficient.

For achieving the above object, the technical solution adopted in the utility model is: compound piston ring, and it is superimposed together by the two-piston ring and constitutes, and the cross section separately of two-piston ring is trapezoidal, its inclined-plane fits together and constitutes square-section integral body, and the opening dislocation of two-piston ring is superimposed.

As shown from the above technical solution, one in two piston rings is mainly played the steam packing effect, another had both had the steam packing effect, also redeeming simultaneously, can compensate the sideshake that increases owing to wearing and tearing, thereby can prolong the working life of piston ring, and then can guarantee that motor has stable working efficiency.

Description of drawings

Fig. 1 is a structural representation of the present utility model;

Fig. 2 is the A-A sectional view among Fig. 1;

Fig. 3 is that user mode of the present utility model is schemed with reference to outfit.

The utility model is described in further detail below in conjunction with drawings and Examples.

Embodiment:

As shown in Figure 1, 2, compound piston ring comprises two piston rings (10), (20), and both are superimposed together, and the cross section separately of two-piston ring (10), (20) is trapezoidal, and the cross section after superimposed is square.

Shown in Fig. 2,3, two-piston ring (10), (20) cross section symmetry that compensates one another, promptly two piston rings (10), (20) cross section are the trapezoidal of symmetry, are shaped as rectangular after two trapezoid cross sections are superimposed, and this can well assemble easily with standardized piston (30).

With reference to Fig. 1,2,3, piston ring (10), (20) its boundary dimension under free state is bigger slightly than cylinder (40) internal diameter, when it packs cylinder into piston (30) after, just produce suitable elastic force and be close on the cylinder (40), piston ring (10), (20) are pressed on the groove lower end surface of piston (30) under the effect of combustion steam pressure, the pressure that expands moves down with piston (30) and constantly descends, and the combustion steam pressure is attached on cylinder (40) wall piston (10), (20) to the active force of the ring back of the body more tightly.Combustion vapour can not directly drain to from the incision of piston ring (10) on the piston ring (20), it must be around the incision to piston ring (20), because during concrete the use, the otch of two-piston ring (10), (20) is oppositely placed, promptly two otch be separated by 180 the degree, like this, upper and lower piston ring (10), (20) just constitute an integral body of guaranteeing to seal.The broadside that is in following piston ring (20) is external, and its chrome-faced is handled, make it have wear resistance, and be in the outer surface coating not of the piston ring (10) of top, like this, under the effect of expansive force, the outer surface of piston ring (10) weares and teares gradually, carrying out along with wearing and tearing, piston ring (10) then constantly outwards stretches, therefore, piston ring (10), (20) superimposed height still constantly increases, and selects the bevel angle at superimposed place, makes the value added of superimposed height can compensate the value added of its sideshake just, this has just eliminated piston ring play and adverse effect of causing up and down in piston (30) groove, thereby improves the working life of piston ring and can stablize efficiency of engine.

Claims (3)

1. compound piston ring, it is characterized in that: the cross section separately of two-piston ring (10), (20) is trapezoidal, and its inclined-plane fits together and constitutes square-section integral body, and the opening dislocation of two-piston ring (10), (20) is superimposed.

2. compound piston ring according to claim 1 is characterized in that: described two-piston ring (10), (20) cross section are mutually symmetrical, the formation that is superimposed together rectangular.

3. compound piston ring according to claim 1 and 2 is characterized in that: external and its chrome-faced processing of the broadside of piston ring (20).

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