CN2414204Y - Compensation sealing type engine piston - Google Patents

Abstract

The utility model discloses a compensation sealing type engine piston. A piston body (1) is provided with three piston ring grooves, wherein a first air ring groove (2) is provided with a pair of air rings (13) lacking reverse thrust. A second air ring groove provided with a positioning tappet (5) and an anti-ellipse tappet (8) is provided with a pair of air rings (14, 15) of which the ends are correspondingly staggered. A third oil ring groove is provided with an oil ring (17) with a folded single side. The piston of the utility model has the advantages that the utility model has the sealing and compensation function, the leakage of the end gap and the back gap is reduced, the dynamic performance of the engine, the economy of the fuel and the starting performance of the engine are improved, and the maintenance-free period is extended.

Description

Compensation sealing formula engine piston

The utility model belongs to the engine fuel technical field, be specifically related to a kind of be used for the fuel automobile motor can prevent the compensation sealing formula piston that working gas leaks and lubricating oil is scurried into effectively.

Piston ring on the existing engine fuel piston expanding with heat and contract with cold when guaranteeing that it is worked in cylinder all leave certain clearance at the opening end of piston ring, but the leakage of working gas can be caused in this gap.According to data, even the new motor or the less motor working properly that weares and teares, the air leak amount of its piston also can reach 15-201/mm.Along with the service wear of piston ring, opened gap can increase gradually, and when the gap increased to a certain degree, the working efficiency of cylinder will seriously reduce.In addition, piston ring is to seal by self elastic force, and the elasticity that causes under secular distortion that each parts in service produce and the high temperature weakens, wearing and tearing etc. can cause that all piston ring produces back clearance and leaks.Back clearance leaks not only can reduce the power character of motor, the Economy of fuel and the startability of motor, also can make the machine oil of crankcase scurry into combustion chambers burn in a large number, the burn oil that Here it is it has often been said.In addition, contain a large amount of unsaturated hydrocarbon in the fuel, four oneself plumbous, imperfect combustion carbon granules etc. infiltrate machine oil by piston ring and can cause that machine oil is rotten.Especially in diesel engine, the vehicle of petty top grade no matter how, the long-time machine oil of operation will contaminated one-tenth black, and these impurity in the machine oil have quickened the wearing and tearing of workpiece in the motor as abrasive material.Also caused motor generally after automobile running 3-8 is ten thousand kilometers, just to need overhaul just because of these reasons.Fricting resistance loss in the existing cylinder accounts for 70-80% mainly from piston ring, and the major measure that solves is to reduce piston ring quantity, reduction piston ring elasticity now.The quantity of piston ring has reduced to three roads by four to five roads before 30 years, but reduces flexible approach because the influence that leaked by back clearance does not have big progress so far.The design people through concentrating on studies for many years, has developed a kind of compensation sealing formula piston at the deficiency of existing piston, has solved this problem well, evidence pistons work function admirable of the present utility model.

The purpose of this utility model is to provide a kind of processing easy, and good seal performance prevents that back clearance from leaking, and can reduce the surface friction drag between piston and cylinder effectively, improves the service behaviour of cylinder, prolongs the compensation sealing formula piston in non-maintaining cycle of motor.

The utility model is achieved in that by piston body and one group of piston ring to be formed, and three road piston ring grooves are arranged on the piston body, and first road is that compression, second road are oil ring groove for two compressions, the 3rd road.On the center circumferential of the second road compression, relatively be provided with bar hole quickly, a pair of location, have a pair of anti-ellipse bar quickly hole therebetween, two locate quickly the bar rotation is assemblied in by spring respectively symmetrically and locatees quickly in the bar hole, and anti-ellipse bar quickly is assemblied in the anti-ellipse bar quickly hole by spring.In the top compression ring groove, be equipped with lacking the anti-compression ring that pushes away; Be equipped with pair of end portions 180 ° the compression ring that staggers relatively in the second road compression, the end of two compression rings has and locatees the opening that the location convex shoulder of boom end quickly matches; Be equipped with monolateral folding oil starvation ring in the 3rd road oil ring groove 4.

Because piston of the present utility model has adopted location quickly bar and the anti-ellipse bar quickly with sealing compensation effect, solved the contradiction that improves between sealing and the reduction surface friction drag well, not only sealability is better than conventional piston greatly, and surface friction drag is little, reduce the back clearance leakage, thereby improved the compression efficiency of cylinder, improved the service behaviour of motor, prolong the non-maintaining phase of motor, improved the utilization efficiency/cost ratio of machineries such as automobile.

Below in conjunction with accompanying drawing and embodiment the utility model is further described, but the utility model is not limited to shown in the accompanying drawing.

Plan view is partly cutd open in the piston assembly of Fig. 1 the utility model;

Fig. 2 overlooks exploded sketch for the piston body of Fig. 1 partly cuts open along compression center, second road;

Fig. 3 for the location of the utility model quickly bar partly cut open schematic representation;

Fig. 4 is the plan view of Fig. 3;

Fig. 5 partly cuts open schematic representation for the anti-ellipse bar quickly of the utility model;

Fig. 6 is the left view of Fig. 5;

Fig. 7 for the utility model to lacking the anti-compression ring ring end connecting part structural representation that pushes away;

Fig. 8 is two compression ring ring end connecting parts structural representation of the utility model;

Fig. 9 is the monolateral folding oil starvation ring ring end connecting part structural representation of the utility model.

As shown in Figure 1, 2, the utility model is made up of piston body and one group of piston ring, and piston body 1 has three road piston ring grooves, and first road is that compression 2, second road are oil ring groove 4 for two compressions 3, the 3rd road.On the center circumferential of the second road compression, relatively be provided with bar hole 6 quickly, a pair of location, a pair of anti-ellipse bar quickly hole 9 is respectively arranged therebetween, hole 6,9 is uniformly distributed along the circumference, two locate quickly bar 5 rotations is assemblied in by spring 7 respectively symmetrically and locatees quickly in the bar hole 6, and anti-ellipse bar quickly 8 is assemblied in the anti-ellipse bar quickly hole 9 by spring 10.In top compression ring groove 2, be equipped with lacking the anti-compression ring 13 that pushes away; Being equipped with stagger relatively 180 ° the end of compression ring 14,15, two compression rings of pair of end portions in the second road compression 3 has and locatees the opening 12 that the location convex shoulder 11 of bar 5 ends quickly matches; Be equipped with monolateral folding oil starvation ring 17 in the 3rd road oil ring groove 4.

Fig. 3,4 shows and locatees the basic structure of bar 5 quickly.Locate quickly that an end of bar 5 has the spring blind hole, there is a location convex shoulder 11 that is offset to center one side the other end.

Fig. 5,6 show anti-ellipse bar quickly 8 basic structure its be the Cylindrical object that an end has the spring blind hole.

Fig. 7 shows top compression ring--and to lacking the anti-basic structure that pushes away compression ring 13, the stepped shaft overlap joint mouth that its two end part overlap is blocked the opening of this compression ring mutually, can reduce gas blowby effectively, has the effect that prevents that machine oil is rotten.If adorn usefulness in diesel engine, this ring is designed to the anti-twist type ring that pushes away, to reduce the pollution of waste gas to machine oil.This ring can be cancelled in some high-speed gasoline engines, so that reduce power loss.

Fig. 8 shows the second road compression ring--and with the basic structure of the two compression rings 14,15 of groove, the end of the two compression rings of the same groove of two overlappings is staggered 180 ° mutually, has blocked port gap each other mutually and has compensated the back clearance that the other side produces, and prevents oil, gas leakage.Also be provided with two near the collar extension of the middle lower end of dicyclo with hydraulic fluid port 16, be used to get rid of excessive machine oil.It is fixing that two ring openings are located quickly bar 5 by two in the second road compression respectively, prevents two compression ring counterparts in the working procedure.Together play with four anti-ellipse bars quickly 8 simultaneously and prevent that the back clearance that piston ring distortion and cylinder ovalization produce from leaking.Adopt the compression ring of this structure, the end gap size is little to the influence of engine performance, therefore can design end gap more greatly, to reduce the scuffing of cylinder bore fault that causes because of the engine water temperature height.

Form a very little trapped fuel chamber in the interlayer edge work of dicyclo, following ring is not scraped most oil film fully and is scraped by last ring and be stored in this space, and a preservation and uniform oil film action are played in the trapped fuel chamber, the then suitable return opening discharge of unnecessary machine oil.

Fig. 9 shows the 3rd road oil ring--the basic structure of monolateral folding oil starvation ring 17.Except that adopting the monolateral knuckle of steel disc formula, all the other are all identical with the conventional piston ring.

The action principle of each functional part of the present utility model and characteristics thereof:

1, quickly bar 5, anti-ellipse bar quickly 8 of two compressions in ad hoc second road of the utility model and the location that wherein is provided with, under the effect of spring force, the back clearance that not only can prevent piston ring effectively leaks and the leakage of piston ring inside groove, and the elasticity of piston ring self can weaken and not influence sealing, thereby reduced the influence that piston ring surface friction drag causes engine power.

2, compared with prior art, piston of the present utility model has been eliminated piston ring side clearance, has compensated back clearance, blocked the inside groove leakage, the waste gas of the feasible crankcase that bleeds reduces in a large number, and engine compression ratio is increased, and the mixed gas loss reduces, intake and exhaust are more abundant, the service behaviour of motor is improved, and it is easier to start, and the minimizing of exhausted air quantity that machine oil is not easy is contaminated, reduced the machine oil quantity of scurrying into cylinder simultaneously, made prolong the maintenance period of motor.

3,, overcome that service wear increasing of conventional piston ring opened gap or piston ring elasticity die down and the motor three that must carry out is protected operations because the elimination of end gap and locate the employing of indemnifying measures such as bar 5, anti-ellipse bar quickly 8 quickly.

4, because anti-ellipse effect and machine oil situation are improved the minimizing of rear engine wear extent, the uniform oil film action of dicyclo can make barrel wear reduce, piston ring gap can design more greatly, and the scuffing of cylinder bore fault that the water temperature height is caused reduces, and this can further prolong the engine overhaul cycle.

5, the conventional piston ring is to realize the back clearance sealing by the tension force of self, and is relatively poor to oval adaptability, and cylinder sleeve is irregular oval wearing and tearing, is the effect that obtains.Elasticity all designs very highly, has so just increased surface friction drag.And improved anti-back clearance leakage function after adopting compensation sealing formula piston technology, then the design flexibility of piston ring can be reduced the influence that the resistance of reducing friction causes engine power.In some high-speed gasoline engines, even can cancel top compression ring,, reduce the dynamic friction loss with the wearing and tearing of further minimizing cylinder.

6, the spring that plays the elastic compensating effect places internal piston deeply, no longer resemble and under high temperature, high pressure, oil starvation, high-speed friction condition, work the piston ring, so much more flexible than piston ring aspect selecting materials in processing, only need to consider elasticity factor just, thereby cut down finished cost.

7, the minimizing of piston ring air leakage has increased the cleanliness of crankcase, crankcase air inlet caliber can be reduced, and this has increased the crankcase depression degree, can reach the purpose that suppresses the oil sealing leakage of oil.

Claims (6)

1, a kind of compensation sealing formula engine piston, comprise piston body and one group of piston ring, piston body (1) has three road piston ring grooves, first road is that compression (2), second road are that two compressions (3), the 3rd road are oil ring groove (4), it is characterized in that: be equipped with in top compression ring groove (2) lacking the anti-compression ring (13) that pushes away; On the center circumferential of the second road compression, be provided with two and locate quickly bar hole (6), respectively be provided with a pair of anti-ellipse bar quickly hole (9) therebetween, locating quickly bar (5) flexibly is assemblied in and locatees quickly in bar hole (6), anti-ellipse bar quickly (8) flexibly is assemblied in the anti-ellipse bar quickly hole (9), in the second road compression (3), be equipped with the compression ring (14,15) that pair of end portions staggers mutually, the end of two compression rings with locate quickly bar (5) end and match; Be equipped with monolateral folding oil starvation ring (17) in the 3rd road oil ring groove (4).

2, compensation sealing formula engine piston as claimed in claim 1, it is characterized in that: the location that is provided with in the second road compression quickly bar hole (6) and anti-ellipse bar quickly hole (9) is uniformly distributed along the circumference, locate quickly bar (5) rotation and be assemblied in by spring (7) respectively symmetrically and locate quickly in bar hole (6), anti-ellipse bar quickly (8) is assemblied in by spring (10) to be prevented in the ellipse bar quickly hole (9).

3, as claim 1,2 described compensation sealing formula engine pistons, it is characterized in that: the two compression rings in the second road compression (3) leave opening (12) separately so that the location convex shoulder (11) of bar (5) end matches with locating quickly.

4, compensation sealing formula engine piston as claimed in claim 1 is characterized in that: the end of the two compression rings (14,15) in the second road compression (3) is staggered 180 ° mutually.

5, as claim 1,2 described compensation sealing formula engine pistons, it is characterized in that: locate quickly that an end of bar (5) has the spring blind hole, there is a location convex shoulder (11) that is offset to center one side the other end.

6, as claim 1,2 described compensation sealing formula engine pistons, it is characterized in that: anti-ellipse bar quickly (8) is the Cylindrical object that an end has the spring blind hole.

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