CN100445544C - Piston with pressure-reducing piston ring - Google Patents
Piston with pressure-reducing piston ring Download PDFInfo
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- CN100445544C CN100445544C CNB2006100204447A CN200610020444A CN100445544C CN 100445544 C CN100445544 C CN 100445544C CN B2006100204447 A CNB2006100204447 A CN B2006100204447A CN 200610020444 A CN200610020444 A CN 200610020444A CN 100445544 C CN100445544 C CN 100445544C
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Abstract
The present invention relates to a piston with a pressure reducing piston ring, which relates to an engine piston. In order to solve the problem that the piston rings in the existing pistons have big friction loss due to bearing thrust at the backs of the rings, the present invention is provided. The piston comprises a piston body, a piston ring groove and a piston ring in the piston ring groove, wherein the piston ring groove is open laterally on the piston body, the piston ring groove is composed of an upper and a lower notches, openings at the upper part are deep, and openings at the lower part are shallow. An inner ring and an outer ring tightly contacted with the inner ring are arranged in the upper notch, an outer tension ring tightly contacted with the outer ring is arranged in the lower notch, the outer ring and the inner ring can be fixed rings or inner tension rings, and a step is made of materials separated from the piston body, wherein the thermal coefficients of expansion of the materials are the same as those of the outer tension ring. The present invention has the advantages that the thrust at the backs of the rings received by the piston ring is reduced, friction loss caused by the thrust is reduced, and sealing and airtight effects are strengthened. The present invention can be widely suitable for reciprocating piston engines and other occasions needing sealed high pressure gas to do work.
Description
Technical field
The present invention relates to a kind of piston of motor, particularly a kind of piston with pressure-reducing piston ring that can reduce piston ring to cylinder inner wall pressure.
Background technique
The piston reciprocating type explosive motor is since invention, develop rapidly through more than 100 years, its fuel economy is still very low, except that the heat loss that accounts for more than 60%, piston, piston ring in power stroke because the effect of the ring back of the body thrust that puts on piston ring that the side pressure of connecting rod transmission and pressurized gas expansion working produce, the wearing and tearing of piston ring and cylinder inner wall have further been aggravated, increase surface friction drag on the one hand, weaken on the other hand and seal the effect of holding one's breath, reduced the capacity for work of gasified fuel, internal combustion engine thermal efficiency is reduced greatly, and this problem is never effectively solved.Studies show that according to related data and old engine scuffing degree, piston ring in the power stroke since the effect of pressurized gas piston ring press to the ring back of the body surface friction drag merit that thrust produced of cylinder inner wall and wearing and tearing to account for wear and tear in the cylinder 50～60%.The condition of piston head is very abominable in addition, makes various material production thermal fatigue phenomenons under the High Temperature High Pressure effect.In this case, according to researching and analysing of related data, the frictional loss merit between piston and piston ring and the cylinder inner wall is bigger 3 times than the frictional loss merit of connecting rod bearing.(contain the ring back of the body thrust that piston ring self elastic force, pressurized gas are pressed to piston ring cylinder inner wall and act on the various pressure that pressure ratio on the connecting rod bearing acts on the cylinder inner wall, the side pressure that the crankshaft-link rod operation produces etc.) big 3 times, so the friction factor of cylinder inner wall and piston ring is bigger more than 9 times than the friction factor between the connecting rod bearing.Therefore, reduce piston ring and press to the effective ways that the pressure of cylinder inner wall is reduction surface friction drag merit and wearing and tearing.
Recently, German engineer " uses the laser exposure cylinder bearing face " and tests out exactly basically the fuel oil that sliding friction consumes in the cylinder to reach as high as 75%.According to Sohu.com's message " utilizing laser technique Audi research and development automobile fuel saving new technology "---Xinhua News Agency Beijing special despatch on November 10th, 2004: Germany " Business " publishes article recently and points out, " lower fuel consumption; higher power---in the competition of the following automobile of development, the automaker just urgently seeks the innovation in motor research and development field.The researcher of Audi company claims: utilize the laser exposure cylinder bearing face can make engine fuel consumption descend 75% at most, and make cylinder bearing face and wear of piston-rings reduce by 90%.They place hope on laser, and it can make the top layer vaporization of working surface." this shows; after the cylinder sleeve piston of internal-combustion engine, piston ring design are produced; its coefficient of sliding friction is just decided; and be the fixed value (the aggravation meeting along with wearing and tearing changes to the direction that increases certainly) of a quite stable in the identical time period; in this case, reduce or eliminate the pressure or the coefficient of sliding friction that cause skimming wear all can reduce or eliminate frictional loss.Thereby the work that the Germany engineer is done is to reduce the coefficient of sliding friction significantly to reduce the surface friction drag oil consumption, reaches the fuel-economizing purpose of energy saving.
Summary of the invention
The objective of the invention is in order to solve that the existing piston Reciprocating engine exists because piston ring is subjected to ring carries on the back thrust and cause that frictional loss is big, and then the big deficiency of energy consumption, provide a kind of and can reduce the suffered ring back of the body thrust of piston ring, strengthen the effect that sealing is held one's breath, reduce friction loss significantly, reach the piston with pressure-reducing piston ring of energy-conservation purpose.
The objective of the invention is to realize by following technical proposals:
Piston with pressure-reducing piston ring comprises the piston ring groove on piston body, the piston body, the piston ring in the piston ring groove, and the notch up and down of the connection that piston ring groove is dark by upper opening, lower openings is shallow constitutes, and it has cambered outwards step in notch inboard down; Piston ring comprises and being arranged in the notch and the interior ring that the bottom surface contact with the upper-end surface of step, outer expansion ring, the bottom surface in the notch contacts with the upper-end surface of outer expansion ring and the outer shroud of the outer side contacts of inboard and interior ring down; In the ring external diameter greater than the diameter of step less than the internal diameter of outer expansion ring; The outside of outer expansion ring contacts with the inner wall sealing of cylinder, and the external diameter of outer shroud is less than the diameter of cylinder inner wall; Interior ring and outer shroud are inner pressure ring, or retaining ring.The external diameter of outer expansion ring is being unkitted when allocating cylinder into, is slightly larger than the diameter of cylinder inner wall, be fitted into cylinder after, its outside relies on himself elastic force closely to contact with cylinder inner wall, and cylinder inner wall is applied with outside power, so be referred to as outer expansion ring.The height of outer expansion ring equates with the thickness of step, also can be unequal.
Above-mentioned interior ring and outer shroud are inner pressure ring, or retaining ring.Described inner pressure ring is meant that its internal diameter is slightly less than the external diameter of its inboard contactant and (at interior ring, is meant the groover rot diameter of piston ring groove; At outer shroud, the external diameter of ring in being meant), and itself have elasticity, after assembling, its inboard contactant is applied with inside pressure, so be referred to as inner pressure ring.Described retaining ring is meant that it is fixed in the groove, can not apply inside pressure to its inboard contactant, also can not apply outside tension force to the contactant in its outside.The production fit of retaining ring can have two kinds, and a kind of is when producing, and cuts into several closed retaining rings, is installed in before casting for piston then in the piston ring groove, because the almost not wearing and tearing of this ring can be used for a long time; A kind of is to change retaining ring on the basis of existing piston ring, with the mutual interlock of barbed portion, and with rivet, screw or fixing pin or other mechanical means breach is fixed, and is convenient to produce and installation.
Be connected with spring between above-mentioned outer shroud and the outer expansion ring.This spring is in piston ring working in reciprocating mode process, and tension outer shroud and outer expansion ring make and avoid occurring unsettled gas leakage between the two.Outer expansion ring is provided with the position limit pin that protrudes its upper-end surface, and the corresponding position, bottom surface that outer shroud contacts with the upper-end surface of outer expansion ring is provided with restraining groove, and position limit pin stretches in the restraining groove, and position limit pin and restraining groove are loose fit.The effect that position limit pin and restraining groove are set is to avoid outer shroud and outer expansion ring to break spring owing to rotating mutually in the course of the work.
Be provided with magnet in the above-mentioned outer shroud, outer expansion ring is for being made by the metal that magnet attracts, and this structure also is in order to strengthen the tension effect of outer shroud and outer expansion ring in piston ring working in reciprocating mode process, to make and avoid occurring unsettled gas leakage between the two.
In the piston with pressure-reducing piston ring of above-mentioned any structure, described interior ring is made of an interior ring that laminates up and down and interior two rings.
Above-mentioned outer expansion ring is made of outer Zhang Yihuan that laminates up and down and outer Zhang Erhuan.
Above-mentioned outer Zhang Yihuan and the cross section of outer Zhang Erhuan are the tack tilted conical of inclination laterally; On the pattern that the cross section of outer Zhang Yihuan and outer Zhang Erhuan is combined into, there is " V " font breach that is rotated counterclockwise 90 ° of angles in its outside.
Or the cross section of above-mentioned outer expansion ring is laterally the tack tilted conical that tilts, and the excircle diameter of its upper-end surface is greater than the excircle diameter of its lower end surface.
Or the thickness of above-mentioned outer Zhang Erhuan is thin ring less than the thickness of outer Zhang Yihuan.
The cross section of above-mentioned outer Zhang Yihuan is the tack tilted conical of inclination laterally, and the excircle diameter of its upper-end surface is greater than the excircle diameter of its lower end surface.
In the above-mentioned piston with pressure-reducing piston ring that does not have spring, described interior ring is made of an interior ring that laminates up and down and interior two rings; The cross section of outer Zhang Yihuan and outer Zhang Erhuan is the tack tilted conical of inclination laterally; The cross section outer upper of outer Zhang Yihuan is downward-sloping, and the cross section outer lower portion of outer Zhang Erhuan is inclined upwardly.
In the above-mentioned piston with pressure-reducing piston ring that contains spring, described interior ring is made of an interior ring that laminates up and down and interior two rings; Described outer expansion ring is made of outer Zhang Yihuan that laminates up and down and outer Zhang Erhuan, and the cross section of outer Zhang Erhuan and outer Zhang Erhuan is the tack tilted conical of inclination laterally, and the excircle diameter of its upper-end surface is greater than the excircle diameter of its lower end surface; The upper-end surface of outer Zhang Yihuan is provided with a convex edge, with the lower end of fixing spring, on its sectional shape, a leg-of-mutton breach is arranged between upper-end surface and the lower end surface.
Above-mentioned interior ring is in the independent whole piston with pressure-reducing piston ring, and described outer expansion ring is made of outer Zhang Yihuan that laminates up and down and outer Zhang Erhuan.
Above-mentioned outer Zhang Yihuan and the cross section of outer Zhang Erhuan are the tack tilted conical of inclination laterally; On the pattern that the cross section of outer Zhang Yihuan and outer Zhang Erhuan is combined into, there is " V " font breach that is rotated counterclockwise 90 ° of angles in its outside.
The cross section of above-mentioned outer Zhang Yihuan is the tack tilted conical of inclination laterally, and the excircle diameter of its upper-end surface is greater than the excircle diameter of its lower end surface.
Above-mentioned interior ring is in the independent whole piston with pressure-reducing piston ring, and the cross section of described outer expansion ring is the tack tilted conical that tilts laterally, and the excircle diameter of its upper-end surface is greater than the excircle diameter of its lower end surface.
Above-mentioned does not have spring, interior ring in the independent whole piston with pressure-reducing piston ring, and described outer expansion ring is made of outer Zhang Yihuan that laminates up and down and outer Zhang Erhuan; The cross section of outer Zhang Yihuan and outer Zhang Erhuan is the tack tilted conical of inclination laterally; The cross section outer upper of outer Zhang Yihuan is downward-sloping, and the cross section outer lower portion of outer Zhang Erhuan is inclined upwardly.
In the piston with pressure-reducing piston ring of above-mentioned any structure, described step and piston body are not an integral body, and step is fixedlyed connected with piston body, and the hot expansion system of step is consistent with the thermal expansion coefficient of outer expansion ring.
Above-mentioned interior ring is in the independent whole piston with pressure-reducing piston ring, and described outer shroud is made of outer two rings that laminate up and down and an outer ring; The outer peripheral surface of outer two rings contacts with the inwall of cylinder.
The cross section of above-mentioned outer two rings is a triangle, and the lower end surface is the inclined-plane; There is inclined downward the upper-end surface of an outer ring, and this inclined-plane coincide with the lower end surface of outer two rings and contacts.
Above-mentioned outer shroud is made of outer two rings that laminate up and down and an outer ring; The outer peripheral surface of outer two rings contacts with the inwall of cylinder; The cross section of outer two rings is a triangle, and the lower end surface is the inclined-plane; There is inclined downward the upper-end surface of an outer ring, and this inclined-plane coincide with the lower end surface of outer two rings and contacts.
The various combination structure of the piston ring that all above-mentioned structures all are the quantity difference of carrying out in a piston ring groove, shape difference, structure is different is to reach effect airtight, decompression.Multistage if desired airtight prevent gas leakage, leakage of oil can be offered the piston ring grooves of several as above-mentioned structure more on piston body, in each piston ring groove according to above-mentioned composite structure be provided with in many groups ring, outer shroud, outer expansion rings etc. make up airtight, reduce pressure.
The laminated structure of outer shroud and outer expansion ring is set in same piston ring groove, shutoff breach each other prevents gas leakage mutually on the one hand, alleviated the unsettled gas leak phenomenon that former piston ring occurs on the other hand to a certain extent in the stroke conversion, and by the space between the space between outer shroud and the cylinder inner wall and outer shroud and the piston ring groove upper surface, the expansive force of pressurized gas is acted on the upper surface and the outer circumference surface of outer shroud, strengthened between outer shroud and the outer expansion ring, the sealing effect of surface of contact between outer shroud and the interior ring; The pressurized gas that discharged most of energy by said structure have not had to continue downward leakage on the one hand, outer expansion ring is close to cylinder inner wall under the effect of elastic force on the other hand, further stoped its downward leakage again, and since the pressurized gas leakage at the outer expansion ring back side by outer shroud, interior ring and step sealing, pressurized gas reduce greatly to the ring of outer expansion ring back of the body thrust (thrust that the inboard back of piston ring is applied), correspondingly reduced the pressure of outer expansion ring greatly to cylinder inner wall, and then reduced frictional force between outer expansion ring and the cylinder inner wall greatly, also just reduced frictional loss.
The interior ring structure that setting separates with outer shroud, except that the sealing surface that has increased between itself and the step, ring can move up and down in also playing, can when expanded by heating is inhomogeneous, not influence the effect of sealing (if interior ring and outer shroud adopt overall structure because of step, when step expanded by heating and outer expansion ring are asynchronous, the part that this ring is contacted with step is raised or is reduced, and causes the space to occur between this ring and the outer expansion ring and leak gas, and has increased the ring back of the body thrust of outer expansion ring.), and can avoid overall structure to do the time spent being subjected to outside high pressure gas, inboardly cause surface friction drag and gas leak phenomenon with contacting of piston ring groove inwall.Setting separates with piston body, and the expansion coefficient step identical with the expansion system of outer expansion ring, also is in order further to solve the step same problem that asynchronous expansion with outer expansion ring causes of being heated.The diameter parameters scope of ring also is to contact with outer expansion ring for fear of interior ring in being provided with, because be heated back outer expansion ring and the asynchronous gas leak phenomenon that causes of step expansion.
The outer expansion ring structure of tapered cross-section is set, makes it under the constant situation of self elastic force size, reduce the area of contact with cylinder inner wall, thereby pressure is increased exponentially, can play the effect of better seals high pressure gas.And the structure that the multiple tracks ring structure that employing laminates up and down and many piston ring grooves add the multiple tracks ring, can avoid under the situation of not encircling back of the body thrust, increasing air loss, as calculating with per pass ring air loss 50%, the second road ring air loss then only accounts for 25% of total tolerance, by that analogy, the 4th road ring air loss just has only 6.25%; As calculating with per pass ring air loss 30%, air loss has only 0.81% during to the 4th road ring, moreover many rings of laminated structure, but the also breach of each road ring of shutoff self strengthens obturation effect.
This shows, adopt the present invention of said structure, compared with prior art, can reduce the suffered ring back of the body thrust of piston ring, also just reduced the pressure between piston ring and the cylinder inner wall, under the constant situation of friction factor, reduced surface friction drag between the two significantly, thereby reduced frictional loss; By the employing of various technical patterns, when reducing the suffered ring of piston ring back of the body thrust, the sealing that the has strengthened piston ring effect of holding one's breath has kept the capacity for work of the pressurized gas in the cylinder, has improved fuel economy, reaches the fuel-economizing purpose of energy saving.Thereby the present invention with above-mentioned advantage, not only applicable in the reciprocating-piston engine, can also be applied to the occasion that other needs airtight pressurized gas work done, can improve its energy conversion efficiency significantly, reduce energy consumption.
Description of drawings
Fig. 1 is the structural representation of the embodiment of the invention 1;
Fig. 2 is the cross-sectional schematic representation of the embodiment of the invention 1;
Fig. 3 is the structural representation of the embodiment of the invention 2;
Fig. 4 is the structural representation of the embodiment of the invention 3;
Fig. 5 is the structural representation of the embodiment of the invention 4;
Fig. 6 is the structural representation of the embodiment of the invention 5;
Fig. 7 is the structural representation of the embodiment of the invention 6;
Fig. 8 is the structural representation of the embodiment of the invention 7;
Fig. 9 is the structural representation of the embodiment of the invention 8;
Figure 10 is the structural representation of the embodiment of the invention 9;
Figure 11 is the structural representation of the embodiment of the invention 10;
Figure 12 is the structural representation of the embodiment of the invention 11;
Figure 13 is the structural representation of the embodiment of the invention 12;
Figure 14 is the structural representation of the embodiment of the invention 13;
Figure 15 is the structural representation of the embodiment of the invention 14;
Figure 16 is the structural representation of the embodiment of the invention 15;
Figure 17 is the structural representation of the embodiment of the invention 16;
Figure 18 is the structural representation of the embodiment of the invention 17;
Figure 19 is the structural representation of the embodiment of the invention 18;
Figure 20 is the structural representation of the embodiment of the invention 19;
Figure 21 is the structural representation of the embodiment of the invention 20;
Figure 22 is the structural representation of the embodiment of the invention 21;
Figure 23 is the structural representation of the embodiment of the invention 22;
Figure 24 is the structural representation of the embodiment of the invention 23;
Figure 25 is the structural representation of the embodiment of the invention 24;
Figure 26 is the structural representation of the embodiment of the invention 25;
Figure 27 is the structural representation of the embodiment of the invention 26;
Figure 28 is the structural representation of the embodiment of the invention 27;
Number in the figure, the 1st, piston body, the 2nd, cylinder, the 3rd, piston ring groove, the 4th, interior ring, the 5th, outer shroud, the 6th, outer expansion ring, the 7th, spring, the 8th, position limit pin, the 9th, step, the 10th, restraining groove, the 41st, an interior ring, the 42nd, interior two rings, the 51st, an outer ring, the 52nd, outer two rings, the 61st, outer Zhang Yihuan, the 62nd, outer Zhang Erhuan.
Embodiment
The present invention is further illustrated below in conjunction with specific embodiments and the drawings.
Embodiment 1: as shown in Figure 1 and Figure 2, the piston with pressure-reducing piston ring includes the piston ring groove 3 on piston body 1, the piston body 1, the piston ring in the piston ring groove 3, and the piston body 1 that is with piston ring is arranged in the cylinder 2.Piston ring groove 3 is two sections stepped circular grooves that groove depth is different, and the epimere groove depth is big, and the hypomere groove depth is little, thereby forms step 9 on piston body 1.Piston ring is divided into the outer shroud 5 that is arranged in piston ring groove 3 epimeres, be enclosed within the interior ring 4 in the outer shroud 5 and be arranged on the outer expansion ring 6 of piston ring groove 3 hypomeres.Outer shroud 5 is identical with the thickness of interior ring 4, but both thickness is all less than the height of piston ring groove 3 epimeres, the internal diameter of interior ring 4 is greater than the diameter of the piston body 1 at piston ring groove 3 epimere bottom land places, and the external diameter of interior ring 4 is greater than the diameter of the piston body 1 at piston ring groove 3 hypomere bottom land places.The inboard of outer shroud 5 closely contacts with the outside of interior ring 4, and its external diameter is less than the inner diameter of cylinder 2.Outer shroud 5 and interior ring 4 can be retaining rings, be that self does not have elastic force, there is not outside tension force, also do not have inside pressure, the production fit of retaining ring can have two kinds, and a kind of is when producing, cut into the retaining ring that several seal, the almost not wearing and tearing of this ring before casting for piston, are installed in then in the piston ring groove, owing to can be used for a long time; A kind of is to change retaining ring on the basis of existing piston ring, with the mutual interlock of barbed portion, and with rivet, screw or fixing pin or other mechanical means breach is fixed, and is convenient to produce and installation.Outer shroud 5 and interior ring 4 also can be simultaneously or not be inner pressure ring simultaneously, and promptly its internal diameter external diameter of being slightly less than its inboard contactant (at interior ring, is meant the groover rot diameter of piston ring groove; At outer shroud, the external diameter of ring in being meant), and itself have elasticity, after assembling, its inboard contactant is applied with inside pressure, so be referred to as inner pressure ring.The external diameter of outer expansion ring 6 is slightly larger than the inner diameter of cylinder 2 when not assembling, its internal diameter is slightly larger than the internal diameter of outer shroud 5; After being fitted in piston ring groove 3 and the cylinder 2, the outside of outer expansion ring 6 closely contacts with the inwall of cylinder 2 under the effect of self elastic force.The thickness of outer expansion ring 6 equates that with the height of step 9 its upper-end surface contacts with the lower end surface of outer shroud 5.
For fear of the lower end surface of outer shroud 5 and upper-end surface unsettled gas leakage in stroke of outer expansion ring 6, the tight contact of strengthening both is to strengthen obturation effect, evenly be provided with four springs 7 in the outside of outer shroud 5, the two ends up and down of spring 7 are separately fixed at the outer circumference edge of outer shroud 5 and the upper-end surface of outer expansion ring 6; Break spring 7 for fear of rotating mutually between outer shroud 5 and the outer expansion ring 6, the upper-end surface of outer expansion ring 6 is provided with the position limit pin 8 of four protrusions, is provided with restraining groove 11 in the relevant position of outer shroud 5, and position limit pin 8 stretches in the restraining groove 11, and loose fit with it.
Before adopting the present invention, offer three piston ring grooves on the piston body, be provided with piston ring one in each piston ring groove 3, self elastic force sum of three road piston rings is 90kg * 9.8N/kg=882N.The external diameter of per pass piston ring is that 10cm, thickness are 0.25cm.The pressurized gas pressure that produces in the power stroke is 818N/cm
2, the surplus pressurized gas of considering leakage are combined into about 30% the effect of second and third road piston ring, and then three road piston rings are 818N/cm to the pressure sum of cylinder 2 inwalls
2* (1+30%)=1063.4N/cm
2Then cylinder 2 inwalls are owing to the side pressure sum (not containing the side pressure that the connecting rod transmission applies) that self elastic force of the expansion of pressurized gas and piston ring is subjected to is 1063.4N/cm
2* (10cm * 3.14 * 0.25cm)+882N=9229.69N.
After adopting the present invention, outer expansion ring 6 is identical with original piston ring, to have only himself elastic force be 882N to the pressure of 6 pairs of cylinder 2 inwalls of each road outer expansion ring in theory, then the suffered side pressure of cylinder 2 inwalls has only employing the present invention 882/9229.69 * 100%=9.5% in the past, and side pressure reduces amplitude and reaches 90.5%.
Embodiment 2: as shown in Figure 3, basic structure such as embodiment 1, wherein interior ring 4 is made of that laminate up and down, a unidimensional interior ring 41 and interior two rings 42.
Embodiment 3: as shown in Figure 4, basic structure such as embodiment 2, wherein outer expansion ring 6 is made of the outer Zhang Yihuan 61 and the outer Zhang Erhuan 62 that laminate up and down.There is a leg-of-mutton breach in the outside, cross section of outer Zhang Yihuan 61 with the inwall contact position of cylinder 2, and the outside of upper-end surface contacts with the inwall of cylinder 2, is fixing the lower end of spring 7 on the upper-end surface; The upper-end surface external diameter of outer Zhang Erhuan 62 is suitable with the inner diameter of cylinder 2, and the external diameter of lower end surface external diameter and piston body 1 is suitable, and its cross section is acclivitous tack tilted conical.
Embodiment 4: as shown in Figure 5, basic structure such as embodiment 2, wherein the diameter of the external diameter of the upper-end surface of outer expansion ring 6 and cylinder 2 inwalls is suitable, and the external diameter of lower end surface is less than the diameter of cylinder 2 inwalls, and its cross section is acclivitous tack tilted conical.
Embodiment 5: as shown in Figure 6, basic structure such as embodiment 2, wherein outer expansion ring 6 is made of with outer Zhang Erhuan 62 the outer Zhang Yihuan 61 that laminates up and down.
Embodiment 6: as shown in Figure 7, basic structure such as embodiment 2, wherein outer expansion ring 6 by laminate up and down, the laterally zygomorphic outer Zhang Yihuan 61 in cross section and outer Zhang Erhuan 62 constitute, the diameter of the upper-end surface external diameter of outer Zhang Yihuan 61 and cylinder 2 inwalls is suitable, the lower end surface external diameter is less than the diameter of cylinder 2 inwalls, and the cross section is acclivitous tack tilted conical; The diameter of the lower end surface external diameter of outer Zhang Erhuan 62 and cylinder 2 inwalls is suitable, and the upper-end surface external diameter is less than the diameter of cylinder 2 inwalls, and the cross section is downward-sloping tack tilted conical.
Embodiment 7: as shown in Figure 8, basic structure such as embodiment 2, wherein outer expansion ring 6 is made of the outer Zhang Yihuan that laminates up and down 61 and outer Zhang Erhuan 62, and the thickness of outer Zhang Erhuan 62 is obviously little many than outer Zhang Yihuan 61, is thin the ring.
Embodiment 8: as shown in Figure 9, basic structure such as embodiment 2, wherein outer expansion ring 6 is made of the outer Zhang Yihuan 61 and the outer Zhang Erhuan 62 that laminate up and down.The diameter of the external diameter of the upper-end surface of outer Zhang Yihuan 61 and cylinder 2 inwalls is suitable, and the external diameter of lower end surface is less than the diameter of cylinder 2 inwalls, and its cross section is acclivitous tack tilted conical; The thickness of outer Zhang Erhuan 62 is obviously little many than outer Zhang Yihuan 61, is thin ring.
Embodiment 9: as shown in figure 10, basic structure such as embodiment 1, wherein outer expansion ring 6 is made of with outer Zhang Erhuan 62 the outer Zhang Yihuan 61 that laminates up and down.
Embodiment 10: as shown in figure 11, basic structure such as embodiment 1, wherein outer expansion ring 6 by laminate up and down, the laterally zygomorphic outer Zhang Yihuan 61 in cross section and outer Zhang Erhuan 62 constitute, the diameter of the upper-end surface external diameter of outer Zhang Yihuan 61 and cylinder 2 inwalls is suitable, the lower end surface external diameter is less than the diameter of cylinder 2 inwalls, and the cross section is acclivitous tack tilted conical; The diameter of the lower end surface external diameter of outer Zhang Erhuan 62 and cylinder 2 inwalls is suitable, and the upper-end surface external diameter is less than the diameter of cylinder 2 inwalls, and the cross section is downward-sloping tack tilted conical.
Embodiment 11: as shown in figure 12, basic structure such as embodiment 1, wherein the diameter of the external diameter of the upper-end surface of outer expansion ring 6 and cylinder 2 inwalls is suitable, and the external diameter of lower end surface is less than the diameter of cylinder 2 inwalls, and its cross section is acclivitous tack tilted conical.
Embodiment 12: as shown in figure 13, the piston with pressure-reducing piston ring includes the piston ring groove 3 on piston body 1, the piston body 1, the piston ring in the piston ring groove 3, and the piston body 1 that is with piston ring is arranged in the cylinder 2.Piston ring groove 3 is two sections stepped circular grooves that groove depth is different, and the epimere groove depth is big, and the hypomere groove depth is little, thereby forms step 9 on piston body 1.Piston ring is divided into the outer shroud 5 that is arranged in piston ring groove 3 epimeres, be enclosed within the interior ring 4 in the outer shroud 5 and be arranged on the outer expansion ring 6 of piston ring groove 3 hypomeres.Outer shroud 5 is identical with the thickness of interior ring 4, but both thickness is all less than the height of piston ring groove 3 epimeres, the internal diameter of interior ring 4 is greater than the diameter of the piston body 1 at piston ring groove 3 epimere bottom land places, and the external diameter of interior ring 4 is greater than the diameter of the piston body 1 at piston ring groove 3 hypomere bottom land places.The inboard of outer shroud 5 closely contacts with the outside of interior ring 4, and its external diameter is less than the inner diameter of cylinder 2.Outer shroud 5 and interior ring 4 can be retaining rings, be that self does not have elastic force, there is not outside tension force, also do not have inside pressure, the production fit of retaining ring can have two kinds, and a kind of is when producing, cut into the retaining ring that several seal, the almost not wearing and tearing of this ring before casting for piston, are installed in then in the piston ring groove, owing to can be used for a long time; A kind of is to change retaining ring on the basis of existing piston ring, with the mutual interlock of barbed portion, and with rivet, screw or fixing pin or other mechanical means breach is fixed, and is convenient to produce and installation.Outer shroud 5 and interior ring 4 also can be simultaneously or not be inner pressure ring simultaneously, and promptly its internal diameter external diameter of being slightly less than its inboard contactant (at interior ring, is meant the groover rot diameter of piston ring groove; At outer shroud, the external diameter of ring in being meant), and itself have elasticity, after assembling, its inboard contactant is applied with inside pressure, so be referred to as inner pressure ring.The external diameter of outer expansion ring 6 is slightly larger than the inner diameter of cylinder 2 when not assembling, its internal diameter is slightly larger than the internal diameter of outer shroud 5; After being fitted in piston ring groove 3 and the cylinder 2, the outside of outer expansion ring 6 closely contacts with the inwall of cylinder 2 under the effect of self elastic force.The thickness of outer expansion ring 6 equates that with the height of step 9 its upper-end surface contacts with the lower end surface of outer shroud 5.The diameter of the external diameter of the upper-end surface of outer expansion ring 6 and cylinder 2 inwalls is suitable, and the external diameter of lower end surface is less than the diameter of cylinder 2 inwalls, and its cross section is acclivitous tack tilted conical.
Embodiment 13: as shown in figure 14, the piston with pressure-reducing piston ring includes the piston ring groove 3 on piston body 1, the piston body 1, the piston ring in the piston ring groove 3, and the piston body 1 that is with piston ring is arranged in the cylinder 2.Piston ring groove 3 is two sections stepped circular grooves that groove depth is different, and the epimere groove depth is big, and the hypomere groove depth is little, thereby forms step 9 on piston body 1.Piston ring is divided into the outer shroud 5 that is arranged in piston ring groove 3 epimeres, be enclosed within the interior ring 4 in the outer shroud 5 and be arranged on the outer expansion ring 6 of piston ring groove 3 hypomeres.Outer shroud 5 is identical with the thickness of interior ring 4, but both thickness is all less than the height of piston ring groove 3 epimeres, the internal diameter of interior ring 4 is greater than the diameter of the piston body 1 at piston ring groove 3 epimere bottom land places, and the external diameter of interior ring 4 is greater than the diameter of the piston body 1 at piston ring groove 3 hypomere bottom land places.The inboard of outer shroud 5 closely contacts with the outside of interior ring 4, and its external diameter is less than the inner diameter of cylinder 2.Outer shroud 5 and interior ring 4 can all be retaining rings, can all be inner pressure rings also, or one of them is inner pressure ring, and another is a retaining ring.The external diameter of outer expansion ring 6 is slightly larger than the inner diameter of cylinder 2 when not assembling, its internal diameter is slightly larger than the internal diameter of outer shroud 5; After being fitted in piston ring groove 3 and the cylinder 2, the outside of outer expansion ring 6 closely contacts with the inwall of cylinder 2 under the effect of self elastic force.The thickness of outer expansion ring 6 equates that with the height of step 9 its upper-end surface contacts with the lower end surface of outer shroud 5.Interior ring 4 is made of that laminate up and down, a unidimensional interior ring 41 and interior two rings 42.
Embodiment 14: as shown in figure 15, basic structure such as embodiment 14, wherein the diameter of the external diameter of the upper-end surface of outer expansion ring 6 and cylinder 2 inwalls is suitable, and the external diameter of lower end surface is less than the diameter of cylinder 2 inwalls, and its cross section is acclivitous tack tilted conical.
Embodiment 15: as shown in figure 16, basic structure such as embodiment 13, wherein outer expansion ring 6 is made of with outer Zhang Erhuan 62 the outer Zhang Yihuan 61 that laminates up and down.
Embodiment 16: as shown in figure 17, basic structure such as embodiment 15, the upper-end surface external diameter of the Zhang Yihuan 61 of its China and foreign countries is suitable with the diameter of cylinder 2 inwalls, and the lower end surface external diameter is less than the diameter of cylinder 2 inwalls, and the cross section is acclivitous tack tilted conical; The diameter of the lower end surface external diameter of outer Zhang Erhuan 62 and cylinder 2 inwalls is suitable, and the upper-end surface external diameter is less than the diameter of cylinder 2 inwalls, and the cross section is downward-sloping tack tilted conical.
Embodiment 17: as shown in figure 18, basic structure such as embodiment 15, the lower end surface external diameter of the Zhang Yihuan 61 of its China and foreign countries is suitable with the diameter of cylinder 2 inwalls, and the upper-end surface external diameter is less than the diameter of cylinder 2 inwalls, and the cross section is downward-sloping tack tilted conical; The diameter of the upper-end surface external diameter of outer Zhang Erhuan 62 and cylinder 2 inwalls is suitable, and the lower end surface external diameter is less than the diameter of cylinder 2 inwalls, and the cross section is acclivitous tack tilted conical.
Embodiment 18: as shown in figure 19, the piston with pressure-reducing piston ring includes the piston ring groove 3 on piston body 1, the piston body 1, the piston ring in the piston ring groove 3, and the piston body 1 that is with piston ring is arranged in the cylinder 2.Piston ring groove 3 is two sections stepped circular grooves that groove depth is different, and the epimere groove depth is big, and the hypomere groove depth is little, thereby forms step 9 on piston body 1.Piston ring is divided into the outer shroud 5 that is arranged in piston ring groove 3 epimeres, be enclosed within the interior ring 4 in the outer shroud 5 and be arranged on the outer expansion ring 6 of piston ring groove 3 hypomeres.Outer shroud 5 is identical with the thickness of interior ring 4, but both thickness is all less than the height of piston ring groove 3 epimeres, the internal diameter of interior ring 4 is greater than the diameter of the piston body 1 at piston ring groove 3 epimere bottom land places, and the external diameter of interior ring 4 is greater than the diameter of the piston body 1 at piston ring groove 3 hypomere bottom land places.The inboard of outer shroud 5 closely contacts with the outside of interior ring 4, and its external diameter is less than the inner diameter of cylinder 2.Outer shroud 5 and interior ring 4 can all be retaining rings, also can all be that inner pressure ring or one of them are inner pressure rings, and another is a retaining ring.The external diameter of outer expansion ring 6 is slightly larger than the inner diameter of cylinder 2 when not assembling, its internal diameter is slightly larger than the internal diameter of outer shroud 5; After being fitted in piston ring groove 3 and the cylinder 2, the outside of outer expansion ring 6 closely contacts with the inwall of cylinder 2 under the effect of self elastic force.The thickness of outer expansion ring 6 equates that with the height of step 9 its upper-end surface contacts with the lower end surface of outer shroud 5.Outer expansion ring 6 is made of with outer Zhang Erhuan 62 the outer Zhang Yihuan 61 that laminates up and down.The lower end surface external diameter of the Zhang Yihuan 61 of its China and foreign countries is suitable with the diameter of cylinder 2 inwalls, and the upper-end surface external diameter is less than the diameter of cylinder 2 inwalls, and the cross section is downward-sloping tack tilted conical; The diameter of the upper-end surface external diameter of outer Zhang Erhuan 62 and cylinder 2 inwalls is suitable, and the lower end surface external diameter is less than the diameter of cylinder 2 inwalls, and the cross section is acclivitous tack tilted conical.
Embodiment 19: as shown in figure 20, the piston with pressure-reducing piston ring includes the piston ring groove 3 on piston body 1, the piston body 1, the piston ring in the piston ring groove 3, and the piston body 1 that is with piston ring is arranged in the cylinder 2.Piston ring groove 3 is two sections stepped circular grooves that groove depth is different, and the epimere groove depth is big, and the hypomere groove depth is little, thereby forms step 9 on piston body 1.Piston ring is divided into the outer shroud 5 that is arranged in piston ring groove 3 epimeres, be enclosed within the interior ring 4 in the outer shroud 5 and be arranged on the outer expansion ring 6 of piston ring groove 3 hypomeres.Outer shroud 5 is identical with the thickness of interior ring 4, but both thickness is all less than the height of piston ring groove 3 epimeres, the internal diameter of interior ring 4 is greater than the diameter of the piston body 1 at piston ring groove 3 epimere bottom land places, and the external diameter of interior ring 4 is greater than the diameter of the piston body 1 at piston ring groove 3 hypomere bottom land places.The inboard of outer shroud 5 closely contacts with the outside of interior ring 4, and its external diameter is less than the inner diameter of cylinder 2.Outer shroud 5 and interior ring 4 can all be retaining rings, can all be inner pressure rings also, or one be inner pressure ring, and another is a retaining ring.The external diameter of outer expansion ring 6 is slightly larger than the inner diameter of cylinder 2 when not assembling, its internal diameter is slightly larger than the internal diameter of outer shroud 5; After being fitted in piston ring groove 3 and the cylinder 2, the outside of outer expansion ring 6 closely contacts with the inwall of cylinder 2 under the effect of self elastic force.The thickness of outer expansion ring 6 equates that with the height of step 9 its upper-end surface contacts with the lower end surface of outer shroud 5.Step 9 separates with piston body 1, and its used material is identical with the hot expansion system of outer expansion ring 6 used materials.
Embodiment 20: as shown in figure 21, basic structure such as embodiment 19, wherein the diameter of the external diameter of the upper-end surface of outer expansion ring 6 and cylinder 2 inwalls is suitable, and the external diameter of lower end surface is less than the diameter of cylinder 2 inwalls, and its cross section is acclivitous tack tilted conical.
Embodiment 21: as shown in figure 22, the piston with pressure-reducing piston ring includes the piston ring groove 3 on piston body 1, the piston body 1, the piston ring in the piston ring groove 3, and the piston body 1 that is with piston ring is arranged in the cylinder 2.Piston ring groove 3 is two sections stepped circular grooves that groove depth is different, and the epimere groove depth is big, and the hypomere groove depth is little, thereby forms step 9 on piston body 1.Piston ring is divided into the outer shroud 5 that is arranged in piston ring groove 3 epimeres, be enclosed within the interior ring 4 in the outer shroud 5 and be arranged on the outer expansion ring 6 of piston ring groove 3 hypomeres.Outer shroud 5 is identical with the thickness of interior ring 4, but both thickness is all less than the height of piston ring groove 3 epimeres, the internal diameter of interior ring 4 is greater than the diameter of the piston body 1 at piston ring groove 3 epimere bottom land places, and the external diameter of interior ring 4 is greater than the diameter of the piston body 1 at piston ring groove 3 hypomere bottom land places.The inboard of outer shroud 5 closely contacts with the outside of interior ring 4, and its external diameter is less than the inner diameter of cylinder 2.Outer shroud 5 and interior ring 4 can all be retaining rings, can all be inner pressure rings also, or one be inner pressure ring, and another is a retaining ring.The external diameter of outer expansion ring 6 is slightly larger than the inner diameter of cylinder 2 when not assembling, its internal diameter is slightly larger than the internal diameter of outer shroud 5; After being fitted in piston ring groove 3 and the cylinder 2, the outside of outer expansion ring 6 closely contacts with the inwall of cylinder 2 under the effect of self elastic force.The thickness of outer expansion ring 6 equates that with the height of step 9 its upper-end surface contacts with the lower end surface of outer shroud 5.Wherein outer expansion ring 6 is made of with outer Zhang Erhuan 62 the outer Zhang Yihuan 61 that laminates up and down, and outer Zhang Erhuan 62 thickness are significantly less than outer Zhang Yihuan 61, is thin ring.
Embodiment 22: as shown in figure 23, basic structure such as embodiment 21, the external diameter of the upper-end surface of the Zhang Yihuan 61 of its China and foreign countries is suitable with the diameter of cylinder 2 inwalls, and the external diameter of lower end surface is less than the diameter of cylinder 2 inwalls, and its cross section is acclivitous tack tilted conical.
Embodiment 23: as shown in figure 24, the piston with pressure-reducing piston ring includes the piston ring groove 3 on piston body 1, the piston body 1, the piston ring in the piston ring groove 3, and the piston body 1 that is with piston ring is arranged in the cylinder 2.Piston ring groove 3 is two sections stepped circular grooves that groove depth is different, and the epimere groove depth is big, and the hypomere groove depth is little, thereby forms step 9 on piston body 1.Piston ring is divided into the outer shroud 5 that is arranged in piston ring groove 3 epimeres, be enclosed within the interior ring 4 in the outer shroud 5 and be arranged on the outer expansion ring 6 of piston ring groove 3 hypomeres.Outer shroud 5 is identical with the thickness of interior ring 4, but both thickness is all less than the height of piston ring groove 3 epimeres, the internal diameter of interior ring 4 is greater than the diameter of the piston body 1 at piston ring groove 3 epimere bottom land places, and the external diameter of interior ring 4 is greater than the diameter of the piston body 1 at piston ring groove 3 hypomere bottom land places.The inboard of outer shroud 5 closely contacts with the outside of interior ring 4, and its external diameter is less than the inner diameter of cylinder 2.Outer shroud 5 and interior ring 4 can all be retaining rings, can all be inner pressure rings also, or one be inner pressure ring, and another is a retaining ring.The external diameter of outer expansion ring 6 is slightly larger than the inner diameter of cylinder 2 when not assembling, its internal diameter is slightly larger than the internal diameter of outer shroud 5; After being fitted in piston ring groove 3 and the cylinder 2, the outside of outer expansion ring 6 closely contacts with the inwall of cylinder 2 under the effect of self elastic force.The thickness of outer expansion ring 6 equates that with the height of step 9 its upper-end surface contacts with the lower end surface of outer shroud 5.Wherein outer expansion ring 6 is made of the outer Zhang Yihuan 61 and the outer Zhang Erhuan 62 that laminate up and down, and the diameter of the upper-end surface external diameter of outer Zhang Yihuan 61 and cylinder 2 inwalls is suitable, and the lower end surface external diameter is less than the diameter of cylinder 2 inwalls, and the cross section is acclivitous tack tilted conical; The diameter of the lower end surface external diameter of outer Zhang Erhuan 62 and cylinder 2 inwalls is suitable, and the upper-end surface external diameter is less than the diameter of cylinder 2 inwalls, and the cross section is downward-sloping tack tilted conical.
Embodiment 24: as shown in figure 25, the piston with pressure-reducing piston ring includes the piston ring groove 3 on piston body 1, the piston body 1, the piston ring in the piston ring groove 3, and the piston body 1 that is with piston ring is arranged in the cylinder 2.Piston ring groove 3 is two sections stepped circular grooves that groove depth is different, and the epimere groove depth is big, and the hypomere groove depth is little, thereby forms step 9 on piston body 1.Piston ring is divided into the outer shroud 5 that is arranged in piston ring groove 3 epimeres, be enclosed within the interior ring 4 in the outer shroud 5 and be arranged on the outer expansion ring 6 of piston ring groove 3 hypomeres.Outer shroud 5 is identical with the thickness of interior ring 4, but both thickness is all less than the height of piston ring groove 3 epimeres, the internal diameter of interior ring 4 is greater than the diameter of the piston body 1 at piston ring groove 3 epimere bottom land places, and the external diameter of interior ring 4 is greater than the diameter of the piston body 1 at piston ring groove 3 hypomere bottom land places.The inboard of outer shroud 5 closely contacts with the outside of interior ring 4, and its external diameter is less than the inner diameter of cylinder 2.Outer shroud 5 and interior ring 4 can all be retaining rings, can all be inner pressure rings also, or one be inner pressure ring, and another is a retaining ring.The external diameter of outer expansion ring 6 is slightly larger than the inner diameter of cylinder 2 when not assembling, its internal diameter is slightly larger than the internal diameter of outer shroud 5; After being fitted in piston ring groove 3 and the cylinder 2, the outside of outer expansion ring 6 closely contacts with the inwall of cylinder 2 under the effect of self elastic force.The thickness of outer expansion ring 6 equates that with the height of step 9 its upper-end surface contacts with the lower end surface of outer shroud 5.Wherein outer expansion ring 6 is made of the outer Zhang Yihuan 61 and the outer Zhang Erhuan 62 that laminate up and down.
Embodiment 25: as shown in figure 26, basic structure such as embodiment 24, wherein outer shroud 5 is made of outer two rings 52 that laminate up and down and an outer ring 51, and the cross section of outer two rings 52 is triangular in shape, the lower end surface is the inclined-plane, and the upper-end surface external diameter of outer two rings 52 is suitable with the diameter of cylinder 2 inwalls; The inclined-plane that an outer ring 51 upper-end surface has the inclined-plane, lower end surface with outer two rings 52 to adapt, the external diameter of an outer ring 51 is less than the diameter of cylinder 2 inwalls.
Embodiment 26: as shown in figure 27, basic structure such as embodiment 24, wherein outer shroud 5 is made of outer two rings 52 that laminate up and down and an outer ring 51, and the thickness of outer two rings 52 is significantly less than the thickness of an outer ring 51, is thin ring, and the diameter of its external diameter and cylinder 2 inwalls is suitable; The diameter of an outer ring 51 is less than the diameter of cylinder 2 inwalls.
Embodiment 27: as shown in figure 28, the piston with pressure-reducing piston ring includes the piston ring groove 3 on piston body 1, the piston body 1, the piston ring in the piston ring groove 3, and the piston body 1 that is with piston ring is arranged in the cylinder 2.Piston ring groove 3 is two sections stepped circular grooves that groove depth is different, and the epimere groove depth is big, and the hypomere groove depth is little, thereby forms step 9 on piston body 1.Piston ring is divided into the outer shroud 5 that is arranged in piston ring groove 3 epimeres, be enclosed within the interior ring 4 in the outer shroud 5 and be arranged on the outer expansion ring 6 of piston ring groove 3 hypomeres.Outer shroud 5 is identical with the thickness of interior ring 4, but both thickness is all less than the height of piston ring groove 3 epimeres, the internal diameter of interior ring 4 is greater than the diameter of the piston body 1 at piston ring groove 3 epimere bottom land places, and the external diameter of interior ring 4 is greater than the diameter of the piston body 1 at piston ring groove 3 hypomere bottom land places.The inboard of outer shroud 5 closely contacts with the outside of interior ring 4, and its external diameter is less than the inner diameter of cylinder 2.Outer shroud 5 and interior ring 4 can all be retaining rings, can all be inner pressure rings also, or one be inner pressure ring, and another is a retaining ring.The external diameter of outer expansion ring 6 is slightly larger than the inner diameter of cylinder 2 when not assembling, its internal diameter is slightly larger than the internal diameter of outer shroud 5; After being fitted in piston ring groove 3 and the cylinder 2, the outside of outer expansion ring 6 closely contacts with the inwall of cylinder 2 under the effect of self elastic force.The thickness of outer expansion ring 6 equates that with the height of step 9 its upper-end surface contacts with the lower end surface of outer shroud 5.Wherein outer shroud 5 is made of outer two rings 52 that laminate up and down and an outer ring 51, and the cross section of outer two rings 52 is triangular in shape, and the lower end surface is the inclined-plane, and the upper-end surface external diameter of outer two rings 52 is suitable with the diameter of cylinder 2 inwalls; The inclined-plane that an outer ring 51 upper-end surface has the inclined-plane, lower end surface with outer two rings 52 to adapt, the external diameter of an outer ring 51 is less than the diameter of cylinder 2 inwalls.Step 9 separates with piston body 1, and its used material is identical with the hot expansion system of outer expansion ring 6 used materials.
Claims (12)
1, piston with pressure-reducing piston ring, comprise piston body (1), piston body (1) is gone up the piston ring groove (3) of transverse opening, piston ring in the piston ring groove (3), piston ring groove (3) is dark by upper opening, the notch up and down of the connection that lower openings is shallow constitutes, it has cambered outwards step (9) in notch inboard down, piston ring comprises and being arranged in the notch and the interior ring (4) that the bottom surface contacts with the upper-end surface of step (9), outer expansion ring (6) in the following notch, the bottom surface contacts with the upper-end surface of outer expansion ring (6) and the outer shroud (5) of the outer side contacts of inboard and interior ring (4), the external diameter of interior ring (4) is greater than the diameter of step (9), the outside of outer expansion ring (6) contacts with the inner wall sealing of cylinder (2), it is characterized in that:
The external diameter of interior ring (4) is less than the internal diameter of outer expansion ring (6);
The external diameter of outer shroud (5) is less than the diameter of cylinder (2) inwall;
Interior ring (4) and outer shroud (5) are inner pressure ring, or retaining ring.
2, the piston with pressure-reducing piston ring as claimed in claim 1 is characterized in that: be connected with spring (7) between described outer shroud (5) and the outer expansion ring (6); Outer expansion ring (6) is provided with the position limit pin (8) that protrudes its upper-end surface, outer shroud (5) is provided with restraining groove (10) with the corresponding position, bottom surface that the upper-end surface of outer expansion ring (6) contacts, position limit pin (8) stretches in the restraining groove (10), and position limit pin (8) is loose fit with restraining groove (10).
3, the piston with pressure-reducing piston ring as claimed in claim 1 is characterized in that: described outer shroud is provided with magnet in (5), and outer expansion ring (6) is for being made by the metal that magnet attracts.
4, as claim 1 or 2 or 3 described pistons with pressure-reducing piston ring, it is characterized in that: ring (4) is made of an interior ring (41) that laminates up and down and interior two rings (42) in described.
5, the piston with pressure-reducing piston ring as claimed in claim 4 is characterized in that: described outer expansion ring (6) is made of outer Zhang Yihuan (61) that laminates up and down and outer Zhang Erhuan (62).
6, the piston with pressure-reducing piston ring as claimed in claim 5 is characterized in that: the cross section of outer Zhang Yihuan (61) and outer Zhang Erhuan (62) is the tack tilted conical of inclination laterally; On the pattern that outer Zhang Yihuan (61) and both cross sections of outer Zhang Erhuan (62) are combined into, there is " V " font breach that is rotated counterclockwise 90 ° of angles in its outside.
7, the piston with pressure-reducing piston ring as claimed in claim 4 is characterized in that: the cross section of described outer expansion ring (6) is the tack tilted conical of inclination laterally, and the excircle diameter of its upper-end surface is greater than the excircle diameter of its lower end surface.
8, the piston with pressure-reducing piston ring as claimed in claim 5 is characterized in that: the cross section of outer Zhang Yihuan (61) is the tack tilted conical of inclination laterally, and the excircle diameter of its upper-end surface is greater than the excircle diameter of its lower end surface.
9, as claim 1 or 2 or 3 or 5 or 6 or 7 or 8 described pistons with pressure-reducing piston ring, it is characterized in that: described step (9) is not an integral body with piston body (1), step (9) is fixedlyed connected with piston body (1), and the hot expansion system of step (9) is consistent with the thermal expansion coefficient of outer expansion ring (6).
10, the piston with pressure-reducing piston ring as claimed in claim 9 is characterized in that: described outer shroud (5) is made of outer two rings (52) that laminate up and down and an outer ring (51); The outer peripheral surface of outer two rings (52) contacts with the inwall of cylinder (2).
11, the piston with pressure-reducing piston ring as claimed in claim 10 is characterized in that: the cross section of described outer two rings (52) is a triangle, and the lower end surface is the inclined-plane; There is inclined downward the upper-end surface of an outer ring (51), and this inclined-plane coincide with the lower end surface of outer two rings (52) and contacts.
12, as claim 1 or 2 or 3 or 5 or 6 or 7 or 8 described pistons with pressure-reducing piston ring, it is characterized in that: described outer shroud (5) is made of outer two rings (52) that laminate up and down and an outer ring (51); The outer peripheral surface of outer two rings (52) contacts with the inwall of cylinder (2); The cross section of outer two rings (52) is a triangle, and the lower end surface is the inclined-plane; There is inclined downward the upper-end surface of an outer ring (51), and this inclined-plane coincide with the lower end surface of outer two rings (52) and contacts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100204447A CN100445544C (en) | 2006-03-09 | 2006-03-09 | Piston with pressure-reducing piston ring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100204447A CN100445544C (en) | 2006-03-09 | 2006-03-09 | Piston with pressure-reducing piston ring |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1818365A CN1818365A (en) | 2006-08-16 |
| CN100445544C true CN100445544C (en) | 2008-12-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006100204447A Expired - Fee Related CN100445544C (en) | 2006-03-09 | 2006-03-09 | Piston with pressure-reducing piston ring |
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| Country | Link |
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| CN (1) | CN100445544C (en) |
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|---|---|---|---|---|
| US3583293A (en) * | 1969-01-10 | 1971-06-08 | Richard L De Biasse | Piston-rod device and components thereof |
| US3656766A (en) * | 1969-12-15 | 1972-04-18 | Robert Geffroy | Piston and piston rings unit for an internal combustion engine |
| US4011030A (en) * | 1975-10-31 | 1977-03-08 | Caterpillar Tractor Co. | Engine seal assembly |
| CN2080567U (en) * | 1990-12-05 | 1991-07-10 | 李常在 | Multilayer composite piston ring |
| US5392692A (en) * | 1994-03-14 | 1995-02-28 | Ford Motor Company | Antiblow-by piston and seal construction for high temperature applications |
| CN2244623Y (en) * | 1995-12-07 | 1997-01-08 | 祁振先 | Efficient energy-saving piston device |
| CN2278089Y (en) * | 1996-06-24 | 1998-04-08 | 于占鳌 | Compensation type piston |
| CN2390011Y (en) * | 1999-07-23 | 2000-08-02 | 广西玉柴机器股份有限公司 | Piston combustion chamber of YC 6112 ZLQ diesel engine |
| JP2000337509A (en) * | 1999-05-28 | 2000-12-05 | Nissan Motor Co Ltd | Combination piston ring device |
-
2006
- 2006-03-09 CN CNB2006100204447A patent/CN100445544C/en not_active Expired - Fee Related
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3583293A (en) * | 1969-01-10 | 1971-06-08 | Richard L De Biasse | Piston-rod device and components thereof |
| US3656766A (en) * | 1969-12-15 | 1972-04-18 | Robert Geffroy | Piston and piston rings unit for an internal combustion engine |
| US4011030A (en) * | 1975-10-31 | 1977-03-08 | Caterpillar Tractor Co. | Engine seal assembly |
| CN2080567U (en) * | 1990-12-05 | 1991-07-10 | 李常在 | Multilayer composite piston ring |
| US5392692A (en) * | 1994-03-14 | 1995-02-28 | Ford Motor Company | Antiblow-by piston and seal construction for high temperature applications |
| CN2244623Y (en) * | 1995-12-07 | 1997-01-08 | 祁振先 | Efficient energy-saving piston device |
| CN2278089Y (en) * | 1996-06-24 | 1998-04-08 | 于占鳌 | Compensation type piston |
| JP2000337509A (en) * | 1999-05-28 | 2000-12-05 | Nissan Motor Co Ltd | Combination piston ring device |
| CN2390011Y (en) * | 1999-07-23 | 2000-08-02 | 广西玉柴机器股份有限公司 | Piston combustion chamber of YC 6112 ZLQ diesel engine |
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| Publication number | Publication date |
|---|---|
| CN1818365A (en) | 2006-08-16 |
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