CN2338497Y

CN2338497Y - Leakage-free piston ring and piston associated with same

Info

Publication number: CN2338497Y
Application number: CN 97210985
Authority: CN
Inventors: 李明武
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-02-21
Filing date: 1997-02-21
Publication date: 1999-09-15
Anticipated expiration: 2007-02-21

Abstract

The utility model discloses a leakage-free piston ring and a piston associated with same. The utility model is characterized in that a lower ring is provided with a side overlap joint, and an upper ring is appressed with the lower ring and seals the side overlap joint of the lower ring in a ring groove of the piston. The utility model can efficiently prevent the phenomenon that blow-by and oil pumping of the opening portions of the piston ring affect the engine power, the leakage can not occur because the overlap joint gap increases due to the wear of the ring, and the service life is prolonged by 3-6 times.

Description

There are not the piston ring of leakage and supporting piston thereof

The utility model relates to piston and piston ring combination, relates in particular to a kind of nothing and leaks piston ring and supporting piston thereof.

The main piston assembly that is combined by piston, piston ring is widely used in fields such as Reciprocating engine, air compressor, refrigerator, oxygenerator, pneumatic machinery, steam power machinery.The garden plunger piston ring that uses on the piston has opening, and guarantees that according to different type of machines pressed on ring back piston ring opening part has the gap of leaving 0.15-0.35mm, in case the swollen cylinder of expanded by heating.Even existing piston adopts the ring of the opening that staggers more than the twice to form mazy type and seals depressed structure, still the defective that exists working medium to leak at opening inevitably.Take automobile engine as example, at expansion stroke, because opening part leaks the gases at high pressure after burning, cause engine power to descend; In compression stroke, opening part leaks fuel gas, and engine compression ratio is reduced, and affects engine power, and fuel gas is altered into crankcase simultaneously, has watered down lubricating oil.Gap-clearance of piston rings place also causes to scurry on the lubricant oil to firing chamber participation burning exhaust pollutant is increased.In use, along with the outer surface friction wear of inboard wall of cylinder liner and ring, encircle under the effect of self elastic force, keep fitting by the form that increases opened gap with inboard wall of cylinder liner, cause opened gap constantly to enlarge, gas blowby, the situations such as oil, power decline, tail gas pollution of scurrying are more and more serious.

The purpose of this utility model provides a kind of not gas blowby, does not scurry oil, keeps power stability, and the nothing of long service life is leaked piston ring and supporting piston thereof.

The utility model is made up of upper ring and lower ring, piston, alignment pin, and lower ring interface is designed to side overlap joint mouth, leaves one on the other two locating holes in the piston cannelure; Locate respectively at piston cannelure inner upper ring, lower ring, pressed on ring is close to lower ring and the lower ring of sealing side overlap joint mouth.

The utility model advantage is because lower ring opening is designed to side overlap joint mouth, and pressed on ring is close to the lower ring of sealing side overlap joint mouth all the time, so during reciprocating motion of the pistons, can not cause lower ring side to take the interface gas blowby, alter oily phenomenon, keep engine power stable, and on the basis of existing piston ring, can not increase because of the wearing and tearing overlap joint mouthful gap of ring and leak, prolonged 2-5 times of service life.

The utility model will be further described below in conjunction with drawings and Examples.

Fig. 1 is the utility model side view.

Fig. 2 is the utility model plan view.

As shown in Figure 1, piston 1 leaves one on the other two locating holes, is used for respectively locating pressed on ring 2, lower ring 3.Be close to lower ring 3 in piston 1 cannelure inner upper ring 2, and the pressed on ring 2 interfaces lower ring 3 sides overlap joint that staggers mouthful installs, with the lower ring of pressed on ring 2 bottom surfaces sealing 3 sides overlap joint mouthful.Mutually stagger 180 ° such as present embodiment pressed on ring 2 interfaces and lower ring 3 sides overlap joint mouth.And for example shown in Figure 2, can find out that from the A section after the outside was respectively grinding 50% in two terminations of lower ring 3, the side of formation was connected the overlap joint mouth, namely side is taken otch.Like this, topped lower in pressed on ring 2 forms leak free sealing ring.Lower ring 3 sides overlap joint mouthful product requires outer taking in the length to take weak point, leaves the expansion clearance of interior alignment pin position and 0.15-0.35mm after being convenient to install.Locating stud 4 inboard location are ring 3 down.Fig. 2 B section is that ring 2 structural representations are gone up in locating stud 4 location.When the utility model was reciprocating, two ring natures compressed up and down, and sealing is ring 3 sides overlap joint mouthful down, had prevented that effectively gap-clearance of piston rings place from leaking.

Claims

1, a kind of no leakage piston ring and supporting piston thereof that is made up of upper ring and lower ring, piston, alignment pin is characterized in that lower ring interface is designed to side overlap joint mouth, leaves one on the other two locating holes in the piston cannelure; Locate respectively at piston cannelure inner upper ring, lower ring, pressed on ring is close to lower ring and the lower ring of sealing side overlap joint mouth.