CN2797657Y - Piston assembly with three piston-rings in one groove - Google Patents

Abstract

The utility model discloses a piston assembly with three piston rings in one groove, which belongs to an engine component. The piston assembly with three piston rings in one groove is composed of a piston, a ring groove on the piston, and piston rings in the ring groove, wherein the upper and the lower piston rings of which the cross sections are right-angle trapezoid and the piston ring which is provided with a trapezoidal cross section, clamped between the inclined planes of the piston rings and matched with the inclined planes are arranged in the ring groove; a gap is formed between the top ends of the upper and the lower piston rings and the middle piston ring. A pressure is exerted on a cylinder wall by the inclined planes of the piston rings because of the force of the piston for pushing the piston ring, therefore the sealing performance is raised.

Description

The three ring piston assemblies of one groove

Technical field

The utility model relates to engine pack, i.e. a kind of piston assembly of engine cylinder.

Background technique

The engine piston assembly is by piston and place on the piston piston ring in the annular groove to form, and piston ring can move with piston.Rely on the elasticity of piston ring self to be pressed on the effect of playing sealing on the cylinder wall.For the ease of assembling and making piston ring can rely on the elasticity of self to be pressed on the cylinder wall, piston ring is opening radially, so, there is a breach on the circumference of the sealing that piston is bad, having reduced the sealing of cylinder, is to leave the multiple tracks piston ring groove on piston for improving the present way that adopts of sealing, puts into one piston ring in each groove, the opening direction of piston ring staggers mutually, to improve the sealing of piston.But gap-clearance of piston rings place still regular meeting lose heart and to scurry oil, thereby influence the exhaust emissions quality.

Summary of the invention

The purpose of this utility model is the shortcoming that overcomes prior art, and an a kind of groove three ring piston assemblies of good airproof performance are provided.

The technical solution of the utility model is as follows: the three ring piston assemblies of an a kind of groove, it is made up of annular groove on piston, the piston and the piston ring in the groove, it is characterized in that in annular groove, being equipped with two piston rings that the cross section is a right-angled trapezium up and down, two inclined-planes of piston ring are relative, at the trapezoid cross section piston ring that is having between two piston ring inclined-planes up and down and the inclined-plane coincide, form the space between the top of two piston rings and intermediate piston evil idea up and down.

The power that a this groove three-ring type piston assembly, piston promote the piston ring motion has changed the sealing of cylinder greatly because of the inclined-plane of piston ring produces pressure to casing wall.

Description of drawings

Below in conjunction with drawings and Examples the utility model is described in further detail.

Fig. 1 is the utility model structural representation;

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

Fig. 3 is the utility model schematic diagram.

Among the figure: 1, cylinder barrel, 2,3,4, piston ring, 5, piston, 6, annular groove, 7, the space

Embodiment

As shown in Figure 1 and Figure 2, the utility model is made up of the piston ring that piston (5) is contained in the piston ring groove (6).Piston ring (2), (4) on two band inclined-planes up and down are housed in the annular groove (6), and the inclined-plane of two piston rings (2), (4) is relative up and down, accompanies the piston ring (3) of trapezoid cross section between two inclined-planes, between the front end of piston ring (3) and cylinder barrel (6) gapped (7).

Its sealing principle is as shown in Figure 3: the power F that piston (5) promotes the piston ring motion because of the inclined-plane of piston ring (3) to piston ring (2) and piston ring (4) effect, produce pressure N to the cylinder barrel wall, will change the sealing of cylinder greatly.Lubricant oil can be stored in space (7) between piston ring (2), (3), (4) and the casing wall, and the sharp-pointed acute angle Q of piston ring (2), (4) plays the effect of well striking off unnecessary lubricant oil.

Claims (1)

1, an a kind of groove three ring piston assemblies, it is made up of the piston ring in annular groove (6) on piston (1), the piston and the groove, it is characterized in that in annular groove (6), being equipped with two piston ring (2), (4) that the cross section is a right-angled trapezium up and down, two inclined-planes of piston ring (2), (4) are relative, between piston ring (2), (4) inclined-plane, have and trapezoid cross section piston ring (3) that the inclined-plane coincide, form space (7) between the top of trapezoid cross section piston ring (3) and two cross sections are right-angled trapezium up and down piston ring (2,4).