CN1148663A

CN1148663A - Improvement for piston ring

Info

Publication number: CN1148663A
Application number: CN 95116138
Authority: CN
Inventors: 王伟明
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-10-19
Filing date: 1995-10-19
Publication date: 1997-04-30

Abstract

The present invention is applicable to the piston ring used for sealing fluid between piston and cylinder in reciprocating piston type machine, which is characterized by that the piston rings are tightly overlapped together, and their faying surfaces are distributed along the ring orifice changing direction, so that this piston ring overlapped structure can make the piston rings, cylinder and ring grooves form closed ring sealed surfaces, and the faying surface of the piston rings can be formed into a sealing band so as to can stop the sealed matter from passing through, therefore said invention can retain good sealing property and can prolong the service life of the piston ring.

Description

The improvement of piston ring

The present invention is applicable in reciprocating piston (or be called plunger, below identical) the formula machinery compression ring in the fluid-encapsulated piston ring, particularly conventional engine between the piston and cylinder barrel.

The present reciprocating piston type machinery that uses as motor, oil hydraulic pump, oil hydraulic motor etc., all has cylinder barrel and reciprocating piston in cylinder barrel.The common approximate circle cylinder of the profile of piston, mark has the cylinder of other form sections.Be provided with annular groove on piston, be equipped with piston ring in the annular groove, when sealing state, a certain end face and the cylinder barrel of piston ring and annular groove all are adjacent to sealing surface, and sealed material is difficult for passing through, thereby form sealing.Piston ring is made by the good rigid material of abrasion resistance properties such as metal, pottery usually, the piston ring of being made by rigid material will leave collar extension, adapt to by the size that changes the collar extension gap and to expand with heat and contract with cold and wear and tear the shadow of piston ring girth to because to have had collar extension, piston ring and annular groove end face and cylinder barrel to be adjacent to sealing surface all be annular from the collar extension disconnection.By general knowledge, collar extension is the main leakage way of piston ring.The detailed introduction of pair piston ring is arranged in many data such as " automobile constructions "

The purpose of this invention is to provide the better stiff piston ring of a kind of sealability, when it is expanded with heat and contract with cold and during effect of attrition, the sealing effect at collar extension place is constant.

The present invention is achieved in that when piston ring is packed cylinder barrel into piston after, when being in sealing state, overlapping being adjacent to of piston ring in the same annular groove, can be that many rings are overlapping, the two ends that are preferably a piston ring be overlapping, and faying surface prolongs the direction distribution that the collar extension gap changes.The overlapping subsides sealing surface of piston ring and cylinder barrel that can make is closed into annular, can make the sealing surface that is adjacent to of piston ring and annular groove end face be closed into annular, be adjacent between the sealing surface in above two closures, the overlapping face that is adjacent to of piston ring and piston ring forms sealing strip, and the effect of sealing strip is to stop sealed material to pass through from the overlapping face of being adjacent to of piston ring that is adjacent between the sealing surface at above two closed annulars.When the collar extension gap in certain range changed, the direction that overlapping piston ring can prolong the variation of collar extension gap relatively moved, and does not destroy sealability, and the scope that the collar extension gap changes and do not influence sealability can design on demand.

Advantage of the present invention is that piston ring is subjected to expanding with heat and contract with cold particularly after the influence of wearing and tearing, and the collar extension place still can keep good sealing property.

The example that provides below in conjunction with accompanying drawing is described further.

Fig. 1 is the structural drawing of piston ring after overlapping.

Fig. 2 is the top view of Fig. 1.

Fig. 3 is the sectional view that piston ring prolongs the T-T line among Fig. 1, and the piston ring among Fig. 3 is in sealing state with the piston cylinder barrel of having packed into.

Fig. 4 is the perspective view after piston ring decomposes among Fig. 1.

More than four accompanying drawings give the structure of having shown a kind of collar extension place, wherein (7) are inner ring surface, (8) are the piston ring end face.After piston ring (1) was overlapping, piston ring (1) was adjacent to sealing surface (4) in A place closure with cylinder barrel (2), and piston ring (1) is adjacent to sealing surface (5) in B place closure with piston ring groove (3); Be adjacent between the sealing surface (4) (5) above two, the faying surface (9) of piston ring (1) forms the sealing strip (6) that is similar to dash area among Fig. 4.Prolong the direction that the collar extension gap changes and distribute because overlapping between the piston ring (1) is adjacent to face (9), so when the collar extension gap changes, do not destroy the sealing that is adjacent to sealing surface (4) (5) and sealing strip (6) of two kinds of closures in to a certain degree.Faying surface between the piston ring (1) is adjacent to it by ring (1) self elasticity, sealed material pressure or spring.

Fig. 5 is the structural drawing at the good piston ring collar extension place of a kind of one-way sealing property.

Overlapping being adjacent in two ends of short piston ring of corrugated shape (12) and piston ring (11) in the accompanying drawing 5.Be equivalent to two collar extensions of two piston rings, adopt spring that it is adjacent in case of necessity.Also an end of short piston ring (12) and an end of piston ring (11) can be processed into one.This simple and easy in conjunction with making, be applicable to the demanding machinery of one-way sealing property.

Fig. 6 is the structural drawing of two short piston rings.

Fig. 7 is two structural drawing that short piston ring is combined into one among Fig. 6.

Fig. 8 is the structural drawing at a kind of piston ring collar extension place.

Short piston ring in accompanying drawing 6 or the accompanying drawing 7 can directly be placed in the annular groove, and the structure with all similar accompanying drawing 1 in piston ring composition two ends in the accompanying drawing 8 is adjacent to its maintenance with spring in case of necessity.Also an end of piston ring in the short piston ring of accompanying drawing 6 or accompanying drawing 7 and the accompanying drawing 8 can be made one with methods such as welding.

Claims

A kind ofly be used in reciprocating piston (or be called plunger, below identical) the formula machinery compression ring in the fluid-encapsulated piston ring, particularly conventional engine between the piston and cylinder barrel, it is characterized in that:

1, when sealing state, overlapping being adjacent to of piston ring in the same piston ring groove, the overlapping face of being adjacent to prolongs the direction distribution that the collar extension gap changes.
2, the overlapping front cover that is adjacent to of piston ring and a certain end face of annular groove that can make of piston ring becomes closed annular.
3, the overlapping sealing surface that is adjacent to of piston ring and cylinder barrel that can make of piston ring becomes closed annular.
4, overlapping can the making between piston ring and the piston ring of piston ring forms sealing strip, is adjacent between the sealing surface at above two closed annulars, and sealing strip stops sealed material to pass through from the overlapping face of being adjacent between piston ring and the piston ring.
5, when drawing together plug ring collar extension gap length and change in certain scope of design, the overlapping part of piston is prolonged the direction that the collar extension gap changes and is relatively moved, and does not destroy the seal action that above two closed shapes are adjacent to sealing surface and sealing strip.