CN109989846B - Split steel top steel skirt piston - Google Patents
Split steel top steel skirt piston Download PDFInfo
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- CN109989846B CN109989846B CN201910401495.1A CN201910401495A CN109989846B CN 109989846 B CN109989846 B CN 109989846B CN 201910401495 A CN201910401495 A CN 201910401495A CN 109989846 B CN109989846 B CN 109989846B
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- oil
- annular
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 323
- 239000010959 steel Substances 0.000 title claims abstract description 323
- 230000017525 heat dissipation Effects 0.000 claims abstract description 24
- 238000000926 separation method Methods 0.000 claims abstract description 8
- 238000002485 combustion reaction Methods 0.000 abstract description 30
- 230000000694 effects Effects 0.000 abstract description 15
- 238000005520 cutting process Methods 0.000 abstract description 6
- 238000007789 sealing Methods 0.000 abstract description 5
- 239000003921 oil Substances 0.000 description 126
- 239000010687 lubricating oil Substances 0.000 description 42
- 238000000034 method Methods 0.000 description 18
- 230000008569 process Effects 0.000 description 14
- 238000001816 cooling Methods 0.000 description 7
- 238000012545 processing Methods 0.000 description 5
- 238000003780 insertion Methods 0.000 description 4
- 230000037431 insertion Effects 0.000 description 4
- 238000005461 lubrication Methods 0.000 description 4
- 238000005299 abrasion Methods 0.000 description 3
- 238000005219 brazing Methods 0.000 description 3
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 238000001125 extrusion Methods 0.000 description 3
- 238000007790 scraping Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000007665 sagging Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M9/00—Lubrication means having pertinent characteristics not provided for in, or of interest apart from, groups F01M1/00 - F01M7/00
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F3/00—Pistons
- F02F3/0015—Multi-part pistons
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F3/00—Pistons
- F02F3/0084—Pistons the pistons being constructed from specific materials
- F02F3/0092—Pistons the pistons being constructed from specific materials the material being steel-plate
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F3/00—Pistons
- F02F3/02—Pistons having means for accommodating or controlling heat expansion
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
The invention relates to the technical field of pistons of internal combustion engines, and discloses a split type steel top steel skirt piston, which comprises a piston body provided with an oil inlet, wherein the piston body comprises a piston steel top and a piston steel skirt, an oil cavity and an oil cover are arranged on the piston steel top, a piston pin seat is arranged on the piston steel skirt, a first oil cavity, a second oil cavity and an annular round platform are arranged in the piston steel top, a first stage, a second stage, a first positioning hole and a through hole are arranged in the annular round platform, a discharge hole is formed in the oil cover, an oil guide cover is arranged on the first stage, an oil drain hole is formed in the oil guide cover, and a heat dissipation groove is formed in the piston steel top; the bottom of the piston steel skirt is provided with a circular boss and a second positioning hole, the bottom of the piston steel skirt is provided with a separation hole, the top of the piston steel skirt is provided with an oil inlet hole, and the piston steel skirt is provided with a heat dissipation hole and an annular groove. The invention solves the problems of poor heat dissipation effect of the steel piston and failure of sealing of the piston ring when the steel piston runs due to the fact that the integral type middle channel steel cutting piston is overweight and the wall surface of the oil cavity is too thick in the prior art.
Description
Technical Field
The invention relates to the technical field of pistons of internal combustion engines, in particular to a split steel top steel skirt piston.
Background
Pistons, which are vital components of internal combustion engines, are subjected to alternating mechanical and thermal loads and operate at high speeds in environments at high temperatures and pressures during operation. The existing piston comprises a piston top and a piston skirt which are integrally formed, an oil cavity is formed in the piston top, when the piston works in a cylinder body of an internal combustion engine, the piston continuously generates acting force with a cylinder wall at high temperature and high pressure to generate friction and heat, lubricating oil in the oil cavity flows out to lubricate the piston on one hand, reduce friction between the piston and the cylinder body, cool the piston on the other hand, avoid deformation and expansion of the piston caused by overhigh temperature, and lead to drawing of a cylinder (the inner wall of the cylinder is pulled into very deep grooves, and the piston, a piston ring and the cylinder wall lose tightness when in friction, so that compression pressure of the cylinder is reduced and dynamic property is lost), and normal work of the piston is affected.
When an oil cavity is formed in the piston top of the existing steel piston, two methods exist: 1. a piston with brazing technology (namely, an oil cavity is formed after the top of the piston is cut, and then the cutting part of the steel top of the piston is welded back again); 2. the middle part of the steel piston skirt is cut, the method can lead to deformation of the ring groove wall of the piston placed on the top of the steel piston caused by the fact that the ring groove wall cannot be supported by the steel piston skirt when the steel piston runs, and the thickness of the wall of the piston ring groove is increased in order to obtain effective support of the steel piston skirt, so that the heat dissipation effect of the whole steel piston is reduced, the thickness of the wall of the piston ring groove is increased, the mass of the whole steel piston is increased, and the running efficiency of the steel piston is affected; on the other hand, the cutting groove of the steel piston skirt can lead to the generation of side thrust when the piston connecting rod pushes the whole steel piston to run, so that the steel piston skirt is contacted with the cylinder wall of the internal combustion engine, the whole steel piston is inclined when running, and the steel piston and the cylinder wall of the internal combustion engine generate a larger inclination angle, thereby leading the piston ring to be extruded by the cylinder wall of the internal combustion engine, causing the abrasion of the piston ring and further leading the sealing failure of the piston ring.
Disclosure of Invention
Aiming at the defects, the invention aims to provide a split steel top steel skirt piston, which solves the problems that in the prior art, the integral type middle channel steel cutting piston has poor heat dissipation effect and the piston ring seal can fail when the steel piston runs due to the fact that the mass of the integral type middle channel steel cutting piston is too heavy and the wall surface of an oil cavity is too thick.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
The split steel top steel skirt piston comprises a piston body provided with oil inlet holes, the piston body comprises a piston steel top and a piston steel skirt, an annular oil cover is arranged on the piston steel top, piston pin seats are formed in two opposite wall surfaces of the piston steel skirt, the piston steel top and the piston steel skirt are detachably connected, an annular round table is integrally formed in the middle of the bottom surface of the piston steel top, a cylindrical first oil cavity is formed in the annular round table, an annular second oil cavity is formed between the annular round table and the piston steel top, a first step is fixedly arranged outside the annular round table, a second step is fixedly arranged in the annular round table, a plurality of first positioning holes are formed in the top of the annular round table along the circumference, a plurality of through holes are formed in the wall surface of the annular round table, the oil cover is clamped on the first step, a plurality of oil guide holes are formed in the wall surface of the oil guide cover, and a heat dissipation groove is formed in the inner wall of the piston steel top where the second oil cavity is located; the integrated into one piece has circular boss bottom the piston steel skirt, circular boss and annular round platform interference fit, and a plurality of second locating holes relative with first locating hole position have been seted up to piston steel skirt bottom, are connected with the setting element between first locating hole and the second locating hole, a plurality of separation holes have been seted up to piston steel skirt inner bottom, open a plurality of louvres and annular on the piston steel skirt.
The principle of the invention is as follows: the piston steel top and the piston steel skirt can be divided into two separated units, and the piston steel top can be well independently provided with an oil opening cavity in the processing process, so that the piston steel top is not blocked by the piston steel skirt, and the processing difficulty is reduced; meanwhile, the piston steel top and the piston steel skirt are in interference fit through the annular round table and the round boss, so that the piston steel top and the piston steel skirt are fixedly connected, the first positioning hole and the second positioning hole are mutually aligned during the process, the first positioning hole and the second positioning hole are connected through the positioning piece to form secondary fixation, and the piston is prevented from loosening in the high-speed operation process. When the piston runs, lubricating oil enters the second oil cavity along the oil inlet hole of the piston body from the oil outlet hole on the oil cover and flows in the second oil cavity, the piston steel top where the second oil cavity is located is cooled, the heat dissipation groove is formed, the heat dissipation area of the piston steel top is increased, the heat dissipation performance of the piston steel top is further improved, after the lubricating oil in the second oil cavity is filled, the lubricating oil enters the first oil cavity in the annular circular table through the through hole on the wall surface of the annular circular table, the middle area of the piston steel top is cooled, after the lubricating oil in the second oil cavity is overflowed, the lubricating oil is discharged through the oil guide cover, the two oil drain holes and the separation holes on the piston steel skirt in sequence, and flows along the piston steel skirt to lubricate the piston steel skirt, and friction between the piston steel skirt and the cylinder body is reduced.
The invention has the beneficial effects that: in contrast to the prior art, the method has the advantages that,
1. The piston steel top and the piston steel skirt are made of steel, compared with the existing aluminum piston, the hardness and the strength are better, the operation is more stable, and under the same cylinder diameter of the internal combustion engine, the gap between the internal combustion engine cylinder wall and the split steel top steel skirt piston is smaller, the sealing performance of the piston ring and the internal combustion engine cylinder wall is better, and the piston ring can bear larger pressure when the combustion chamber is exploded, so that the compression ratio (namely the ratio of the total volume of the cylinder to the volume of the combustion chamber) of the internal combustion engine is improved.
2. The split type connection of the piston steel crown and the piston steel skirt shortens the length of the whole split type steel crown steel skirt piston, the area of an oil cavity formed is larger, and the wall thickness of a piston ring groove is designed to be thinner, so that the whole quality of the steel piston is reduced, the friction force is reduced when the split type steel crown steel skirt piston operates, the operation efficiency is better, and the heat dissipation performance of the split type steel crown steel skirt piston is improved; and through split type connection, the grooving process is reduced, so that when the piston connecting rod pushes the split type steel top steel skirt piston to do work, the inclination angle between the steel piston and the cylinder wall of the internal combustion engine, which is generated by side thrust, is reduced, the movement amplitude of the split type steel top steel skirt piston is more stable, the piston ring is prevented from being extruded by the cylinder wall of the internal combustion engine, the abrasion of the piston ring is reduced, and the sealing failure of the piston ring is avoided.
3. Through setting up circular boss and annular round platform, utilize circular boss and annular round platform interference fit, make piston steel roof and piston steel skirt fix, then set up first locating hole and second locating hole again, utilize the setting element to connect first locating hole and second locating hole and form the secondary to the piston fixedly, through dual fixing, reduce the relative motion between piston steel roof and the piston steel skirt, avoid the piston to take place not hard up at high-speed moving in-process, increase the stability of piston, thereby improve the work effect of piston.
4. Through offer the through-hole on annular round platform wall to set up the oil guide lid, make lubricating oil under the restriction of oil guide lid, abundant contact with first oil pocket, thereby make piston steel top middle part regional radiating effect better, cooperate the second oil pocket again, dispel the heat the cooling to the piston steel top is comprehensive, thereby avoid piston steel top to deform because of the high temperature.
5. Through setting up the annular, utilize the annular to play certain storage effect to the lubricating oil that flows through the piston steel skirt, be had lubricating oil in the annular promptly all the time, reach the effect that reduces friction between piston skirt and the internal-combustion engine cylinder wall to reduce the wearing and tearing of piston, the design of annular has also increased the area of contact of piston steel skirt and lubricating oil simultaneously, has improved the cooling effect.
6. In the prior art, a piston which adopts a brazing technology (namely, an oil cavity is formed after the top of the piston is cut, and then the cutting part of the steel top of the piston is welded back), under the cold state and the hot state, excessive expansion and shrinkage can be generated, and the tightness between the steel piston and the steel wall of the internal combustion engine and the efficiency during operation are affected; meanwhile, the stability of a metallographic structure of the steel piston is reduced, the material performance of a welding seam joint is poor, when the internal combustion engine is in overload operation or the gas discharge temperature is too high, the welding point is broken, and all problems of the brazing type piston cannot occur in the split type steel top steel skirt piston.
Further, the oil inlet hole is formed in the piston pin seat. The oil inlet hole is formed in the piston pin seat, so that the oil inlet mode of the split type steel top steel skirt piston lubricating oil is consistent with that of one of the existing integral pistons (namely, the lubricating oil enters the oil cavity from the oil inlet hole in the piston pin seat), and therefore, when the split type steel top steel skirt piston lubricating oil is actually installed and used, only the piston is required to be replaced, other parts are not required to be replaced, and the split type steel top steel skirt piston lubricating oil is convenient for installation of operators.
Further, the oil inlet is formed in the oil guide cover. The oil inlet hole is formed in the oil guide cover, so that lubricating oil enters the first oil cavity in the annular round table in advance, the middle area of the piston steel top is cooled, the lubricating oil enters the second oil cavity through the through hole, the piston steel top where the second oil cavity is located is cooled, and finally the lubricating oil is discharged through the oil discharge hole in the oil cover.
Further, the oil inlet is formed in the top of the piston steel skirt. Through seting up the inlet port at piston steel skirt top for lubricating oil can be faster enter into first oil pocket and second oil pocket in proper order, guarantee the abundant cooling, the heat dissipation of piston steel top.
Further, the oil guide cover is hollow, an annular plate is integrally formed at the top of the oil guide cover, a circular groove is formed in the inner bottom of the oil guide cover, a first spring is placed in the circular groove, the top of the first spring is propped against the bottom surface of the circular boss, and the annular plate is clamped on the first step; the oil cover is detachably connected with a plurality of spring seats, the spring seats are sleeved with second springs, and the top surfaces of the second springs are propped against the bottom surfaces of the piston steel skirts. Through the first spring, in the actual operation process of the split steel top steel skirt piston, the extrusion of the circular boss to the oil guide cover is ensured, the loosening of the oil guide cover is prevented, and the cooling of lubricating oil to the middle part of the piston steel top is influenced; and through the second spring, in the actual operation process of the split steel top steel skirt piston, the bottom of the piston steel skirt keeps extruding the oil cover at all times, so that the oil cover is prevented from loosening or displacing, and the piston steel top in the oil cavity area is influenced to cool by lubricating oil.
The oil cover is detachably connected with a plurality of spring seats, the spring seats are sleeved with second springs, and the top surfaces of the second springs are propped against the bottom surfaces of the piston steel skirts. Through the second spring, in the actual operation process of the split steel top steel skirt piston, the bottom of the piston steel skirt keeps extruding the oil cover at all times, and the oil cover is prevented from loosening or displacing, so that the temperature of the piston steel top in the oil cavity area is influenced by lubricating oil.
Further, the top of the annular round platform is fixedly connected with a bulge, and the bottom of the piston steel skirt is provided with a jack opposite to the bulge. Through the jack on protruding and the piston steel skirt, carry out the position to piston steel top and piston steel skirt and inject to make piston steel top and piston steel skirt more firm when the operation.
Further, threads are arranged in the first positioning holes, and the positioning pieces are bolts. The piston steel top and the piston steel skirt are convenient to detach and replace through the threads and the bolts of the first positioning holes.
Further, the radiating holes are formed in the wall surface of the piston steel skirt where the piston pin seats are located; the ring grooves are densely arranged at positions close to the bottom of the piston steel skirt, and sparsely arranged at positions far away from the bottom of the piston steel skirt. The heat dissipation holes achieve the effect of reducing the weight of the split steel top steel skirt piston on one hand, so that the reciprocating inertial force and vibration of the split steel top steel skirt piston are reduced (namely, the inertial force generated by the reciprocating linear motion of the piston assembly and the small end of the connecting rod in the cylinder) during operation, and the energy consumption is reduced; on the other hand, the heat dissipation effect of the piston steel skirt is improved, and the deformation of the split steel top steel skirt piston caused by heating in the running process is reduced; and when the piston is operated, the piston steel top and the piston steel skirt move up and down under the normal condition, in the process, lubricating oil on the wall surface of the cylinder body can timely contact with the ring grooves densely arranged on the top of the piston steel skirt, so that when the piston steel top and the piston steel skirt move, the piston steel top and the piston steel skirt can be better lubricated with the wall surface of the cylinder body, and meanwhile, the piston steel top and the piston steel skirt can be effectively cooled.
Further, a plurality of piston grooves are formed in the piston steel top, piston rings are embedded in the piston grooves, and a plurality of fine holes opposite to the positions of the ring grooves are formed in the piston steel top. In the running process of the piston, the cylinder body of the internal combustion engine and the split steel top steel skirt piston are sealed through the piston ring, gas leakage generated by combustion of a combustion chamber is prevented, lubricating oil on the inner wall of the cylinder is uniformly scraped, and a layer of oil film is covered on the inner wall of the cylinder, so that normal lubrication of the cylinder, the split steel top steel skirt piston and the piston ring is ensured; meanwhile, lubricating oil flows back to the outer wall of the piston steel skirt through the fine holes under the scraping action of the piston ring, and the piston steel skirt is lubricated and cooled.
Further, annular clamping seats are integrally formed at the top of the piston steel top, and caulking grooves which are matched with the annular clamping seats are formed in the bottom of the piston steel skirt. Through annular cassette and caulking groove, under normal operating, the piston steel skirt can be better support on the piston steel roof for the piston groove on the piston steel roof outer wall can be processed thinner, thereby has improved the radiating effect of piston steel roof, simultaneously, the piston connecting rod utilizes annular cassette and caulking groove when pulling this split type steel roof steel skirt piston long-term operation, and piston steel skirt bottom can be with the more effectual support of piston steel roof top, effectively prevents this split type steel roof steel skirt piston and warp because of stretching under high temperature, high pressure.
Drawings
FIG. 1 is a perspective view of an embodiment of a split steel crown steel skirt piston of the present invention;
FIG. 2 is an exploded view of an embodiment of a split steel crown steel skirt piston of the present invention;
FIG. 3 is a perspective view of a piston steel skirt from a top view in accordance with an embodiment of the present invention;
FIG. 4 is a perspective view of a piston steel skirt from the bottom in accordance with one embodiment of the present invention;
FIG. 5 is a schematic illustration of a piston steel crown in a semi-section in accordance with an embodiment of the present invention;
FIG. 6 is a schematic diagram of an oil inlet hole formed in a piston steel skirt according to a second embodiment of the present invention;
Fig. 7 is a schematic diagram of an oil inlet hole formed in an oil guiding cover in a third embodiment of the present invention.
Detailed Description
The following is a further detailed description of the embodiments:
reference numerals in the drawings of the specification include: piston steel crown 1, piston steel skirt 2, first oil chamber 3, oil cap 4, piston pin boss 5, annular round table 7, first step 8, second step 9, first locating hole 10, boss 11, through hole 12, discharge hole 13, oil guiding cap 14, oil drain hole 15, heat sink 16, annular clamping seat 17, fine hole 18, piston groove 19, circular boss 20, insertion hole 21, second locating hole 22, second oil chamber 24, oil inlet hole 25, annular groove 26, heat sink 27, caulking groove 28, spring seat 29, second spring 30, annular plate 31, circular groove 32, first spring 33, and separation hole 34.
An embodiment is substantially as shown in figures 1 to 5:
The split steel top steel skirt piston comprises a piston body, the piston body comprises a piston steel top 1 and a piston steel skirt 2, an annular oil cover 4 is arranged on the piston steel top 1, piston pin bosses 5 are arranged on two opposite wall surfaces of the piston steel skirt 2, an annular round table 7 is integrally formed on the bottom surface of the middle part of the piston steel top 1, a cylindrical first oil cavity 3 is formed in the annular round table 7, an annular second oil cavity 24 is formed between the annular round table 7 and the piston steel top 1, a first stage 8 is fixedly arranged outside the annular round table 7, a second stage 9 is fixedly arranged in the annular round table 7, four first positioning holes 10 are arranged at the top of the annular round table 7, a group of first positioning holes 10 are arranged in each two groups, two groups of first positioning holes 10 are oppositely arranged, a bulge 11 is fixedly connected at the top of the annular round table 7, threads are arranged in the first positioning holes 10, eight through holes 12 are arranged on the wall surface of the annular round table 7, every four through holes 12 are a group, two groups of through holes 12 are symmetrically arranged, an oil cover 4 is clamped on a first stage 8, a discharge hole 13 is formed in the oil cover 4, an oil guide cover 14 is clamped on a second stage 9, two oil drain holes 15 are formed in the wall surface of the oil guide cover 14, the two oil drain holes 15 are oppositely arranged, an annular clamping seat 17 is integrally formed at the top of the piston steel top 1, a plurality of fine holes 18 are formed in the piston steel top 1, the fine holes 18 are positioned at the top of the piston steel top 1 and on the annular clamping seat 17, when the piston steel top 1 is combined with a piston steel skirt 2, the fine holes 18 are just opposite to the piston steel skirt 2, three piston grooves 19 are formed in the side wall of the piston steel top 1, the fine holes 18 penetrate through the first piston grooves 19 close to the top of the piston steel top 1, piston rings are arranged in the three piston grooves 19, the piston rings in the uppermost piston grooves 19 of the piston steel top 1 are used for scraping oil, the piston rings in the two piston grooves 19 are used for sealing with the cylinder wall of the internal combustion engine, and the inner wall of the piston steel top 1 where the second oil cavity 24 is arranged is provided with a heat dissipation groove 16; the bottom of the piston steel skirt 2 is integrally formed with a circular boss 20, the circular boss 20 is in interference fit with the annular round table 7, the bottom of the piston steel skirt 2 is provided with an insertion hole 21 and four second positioning holes 22, the insertion hole 21 is opposite to the protrusion 11, the second positioning holes 22 are opposite to the first positioning holes 10, the piston steel crown 1 and the piston steel skirt 2 are detachably connected through connecting bolts between the first positioning holes 10 and the second positioning holes 22, under the condition that the cylinder diameter of the internal combustion engine is 190-200mm, the diameters of the first positioning holes 10 and the second positioning holes 22 are 16-22mm, the inner bottom of the piston steel skirt 2 is provided with two separation holes 34, the top of the piston steel skirt 2 is provided with an oil inlet hole 25, an oil pipe is connected between the oil inlet hole 25 and the discharge hole 13, the two opposite side walls of the piston steel skirt 2 are provided with eight ring grooves 26, the ring grooves 26 and the piston pin bosses 5 are positioned on different side walls of the piston steel skirt 2, the ring grooves 26 are densely arranged at positions close to the bottom of the piston steel skirt 2, the positions far from the bottom of the piston steel skirt 2 are sparsely arranged, and a plurality of large heat dissipation holes 27 are arranged on the piston wall surface of the piston steel skirt 2; the caulking groove 28 that fits annular cassette 17 has been seted up to piston steel skirt 2 bottom, and threaded connection has four spring holders 29 on the oil lid 4, and every two spring holders 29 are a set of, and two sets of spring holders 29 set up relatively, and the cover is equipped with second spring 30 on the spring holder 29, and second spring 30 top surface offsets with piston steel skirt 2 bottom surface and sets up.
The oil guide cover 14 is hollow, the distance between the bottom of the oil guide cover 14 and the inner bottom of the annular round table 7 is 5-6mm, an annular plate 31 is integrally formed at the top of the oil guide cover 14, a circular groove 32 is formed in the inner bottom of the oil guide cover 14, a first spring 33 is placed in the circular groove 32, the top of the first spring 33 is propped against the bottom surface of the circular boss 20, and the annular plate 31 is clamped on the second step 9.
The first embodiment is specifically implemented as follows: the first spring and the second spring in this embodiment are both made of a material that can withstand temperatures of 280 ℃. During processing, the piston steel crown 1 and the piston steel skirt 2 can be divided into two separated individuals, and the piston steel crown 1 and the piston steel skirt 2 can be independently processed, so that an oil cavity can be well opened on the piston steel crown 1 in the processing process, the obstruction from the piston steel skirt 2 can not be received, and the processing difficulty is reduced. The circular boss 20 is matched with the annular round table 7, and the radiating holes 27 are formed in the wall surface of the piston steel skirt 2, so that on one hand, the weight of the whole split steel top steel skirt piston is reduced, the running efficiency of the whole split steel top steel skirt piston is better, the heat dissipation is better, the vibration is reduced, the running is more stable, on the other hand, the stroke of lubricating oil is shortened, the lubricating oil can flow through the piston steel top 1 and the piston steel skirt 2 more rapidly, the effects of timely lubrication and cooling are realized, and the expansion and carbon deposition of the split steel top steel skirt piston are reduced; through annular cassette 17 and caulking groove 28, piston steel top 1 can better support on piston steel skirt 2 during operation, simultaneously, the piston groove 19 on the outer wall of piston steel top 1 can process more thinly to improved piston steel top 1's radiating effect, and when split type steel top steel skirt piston is long-term to prevent that piston groove 19 on piston steel top 1 from sagging, deformation because of excessive extrusion, thereby influence the leakproofness of piston ring, and then avoid the internal-combustion engine to increase unnecessary oil consumption. During assembly, the oil cover 4 is clamped onto the first stage 8, the second springs 30 are sleeved on the four spring seats 29, then the oil guide cover 14 is clamped onto the second stage 9, the first springs 33 are placed in the round grooves 32 of the oil guide cover 14, finally the annular round platform 7 of the piston steel crown 1 is in interference fit with the round boss 20 of the piston steel skirt 2, the protrusions 11 of the piston steel crown 1 are inserted into the insertion holes 21 of the piston steel skirt 2 to fix the positions, the two are initially butted, the four first positioning holes 10 on the annular round platform 7 and the four second positioning holes 22 on the piston steel skirt 2 are aligned with each other during the initial butt joint, the first positioning holes 10 and the second positioning holes 22 are connected through bolts to form secondary fixation, the split steel crown piston is prevented from loosening in the high-speed operation process, the first positioning holes 10 and the second positioning holes 22 for connecting the split steel crown piston are 12mm under the condition that the cylinder diameter of an internal combustion engine is 190-200mm, and the split steel crown piston is used for connecting the first positioning holes 10 and the second positioning holes 22 for connecting the piston steel crown 1 and the piston steel skirt 2 are better in strength and the second positioning holes 22-16 mm.
When the split steel top steel skirt piston runs, lubricating oil flows to the discharge hole 13 from the oil inlet hole 25 through the oil pipe and then enters the second oil cavity 24, so that the temperature of the piston steel top 1 where the second oil cavity 24 is located is reduced, and the heat dissipation area of the piston steel top 1 is increased due to the arrangement of the heat dissipation groove 16, and the heat dissipation performance of the piston steel top 1 is further improved; after the lubricating oil in the oil cavity is full, the lubricating oil enters the first oil cavity 3 below the oil guide cover 14 through eight through holes 12 on the wall surface of the annular round table 7, and the middle area in the piston steel top 1 is cooled; under the condition of the same cylinder diameter, the total area of the first oil cavity 3 and the second oil cavity 24 of the split type steel top steel skirt piston is 1-2 times of the area of the existing piston oil cavity, so that the heat dissipation area is larger, the heat dissipation and the temperature reduction of the piston steel top 1 can be more comprehensively realized, the deformation of the piston steel top 1 caused by high temperature can be avoided, after the first oil cavity 3 between the oil guide cover 14 and a gap of 5-6mm between the annular round table 7 is filled with lubricating oil, the lubricating oil flows out of the two oil drain holes 15 on the wall surface of the oil guide cover 14 and flows back from the two separation holes 34 of the piston steel skirt 2, meanwhile, the lubricating oil on the cylinder wall of the internal combustion engine can enter the eight ring grooves 26 and flow along the piston steel skirt 2, so that better lubrication can be generated between the piston steel top 1 and the wall surface of the piston steel skirt 2 when the piston steel top 1 and the piston steel skirt 2 move up and down, and meanwhile, the effective temperature reduction is realized; when the split steel top steel skirt piston runs, a piston ring in a piston groove 19 at the uppermost part of the piston steel top 1 slides on the inner wall of a cylinder of the internal combustion engine to uniformly scrape lubricating oil on the inner wall of the cylinder of the internal combustion engine, so that the normal lubrication of the cylinder, the split steel top steel skirt piston and the piston ring is ensured; meanwhile, the lubricating oil flows into the pores 18, and the pores 18 are opposite to the piston steel skirt 2, and the lubricating oil flows back by scraping of the piston rings, so that the lubricating oil flows back to the wall surface of the piston steel skirt 2, the piston steel crown 1 and the piston steel skirt 2 are lubricated and cooled, friction between the piston and a cylinder body is further reduced, so that abrasion and cylinder drawing of the piston are reduced (namely, the inner wall of the cylinder is drawn into very deep grooves, the piston ring and the gas ring lose tightness when in friction with the cylinder wall, so that compression pressure of the cylinder is reduced, and dynamic property is lost), and meanwhile, three piston grooves 19 formed on the split steel skirt piston are less than those on the existing piston, so that the friction coefficient (namely, the ratio of friction force between two surfaces and vertical force acting on one surface) between the split steel skirt piston and the cylinder wall of an internal combustion engine is reduced, and the power of the internal combustion engine using the split steel skirt piston is further improved.
The bottom of the piston steel skirt 2 keeps extruding the oil cover 4 at any time through the spring seat 29 and the second spring 30, so that the oil cover 4 is prevented from loosening or displacing, and the piston steel top 1 in the oil cavity area is affected to be effectively cooled by lubricating oil; through the first spring 33, the split type steel top steel skirt piston guarantees the moment extrusion of the round boss 20 to the oil guide cover 14 in the actual operation process, and prevents the loosening or displacement of the oil guide cover 14 from affecting the cooling of lubricating oil to the middle part of the piston steel top 1 and the normal flow of the lubricating oil.
Embodiment two:
As shown in fig. 6, this embodiment differs from the first embodiment in that: the oil inlet hole 25 is arranged on the piston pin boss 5. The arrangement mode is consistent with the oil inlet mode of one of the existing integral pistons, and the oil enters the oil cavity from the oil inlet holes 25 arranged on the piston pin boss 5, so that when the piston in the existing cylinder is replaced, the original piston is replaced by the split steel top steel skirt piston, other parts do not need to be slipped, and the installation and the use are more convenient.
Embodiment III:
As shown in fig. 7, this embodiment differs from the first embodiment in that: the oil inlet 25 is arranged in the middle of the circular groove 32 on the oil guide cover 14. The lubricating and cooling effects of this embodiment are the same as those of the first embodiment, and the difference is that the flowing directions of the lubricating oil are opposite, the lubricating oil of this embodiment sequentially enters the annular round table 7 from the two separation holes 34 of the steel top steel skirt and the oil inlet holes 25 formed on the oil guiding cover 14, then enters the oil cavity through the eight through holes 12 of the annular round table 7, and finally, the lubricating oil flows back from the oil drain hole on the oil cover 4.
The foregoing is merely exemplary embodiments of the present application, and specific structures and features that are well known in the art are not described in detail herein. It should be noted that modifications and improvements can be made by those skilled in the art without departing from the structure of the present application, and these should also be considered as the scope of the present application, which does not affect the effect of the implementation of the present application and the utility of the patent. The protection scope of the present application is subject to the content of the claims, and the description of the specific embodiments and the like in the specification can be used for explaining the content of the claims.
Claims (6)
1. The utility model provides a split type steel top steel skirt piston, is including the piston body that is equipped with the inlet port, and the piston body includes piston steel top and piston steel skirt, is equipped with annular oil cap on the piston steel top, has seted up the piston pin seat on two wall surfaces that the piston steel skirt is relative, its characterized in that: the piston steel top is detachably connected with the piston steel skirt, an annular round table is integrally formed in the middle of the bottom surface of the piston steel top, a cylindrical first oil cavity is formed in the annular round table, an annular second oil cavity is formed between the annular round table and the piston steel top, a first step is fixedly arranged outside the annular round table, a second step is fixedly arranged in the annular round table, a plurality of first positioning holes are formed in the top of the annular round table along the circumference, a plurality of through holes are formed in the wall surface of the annular round table, an oil cover is clamped on the first step, a discharge hole is formed in the oil cover, an oil guide cover is clamped on the second step, a plurality of oil drain holes are formed in the wall surface of the oil guide cover, and a heat dissipation groove is formed in the inner wall of the piston steel top where the second oil cavity is located; the piston steel skirt bottom is integrally formed with a circular boss, the circular boss is in interference fit with the annular round table, a plurality of second positioning holes opposite to the first positioning holes are formed in the piston steel skirt bottom, a positioning piece is connected between the first positioning holes and the second positioning holes, a plurality of separation holes are formed in the inner bottom of the piston steel skirt, and a plurality of heat dissipation holes and annular grooves are formed in the piston steel skirt;
The oil inlet is arranged on the piston pin seat or on the oil guide cover or on the top of the piston steel skirt; the oil guide cover is hollow, the distance between the bottom of the oil guide cover and the inner bottom of the annular round table is 5-6mm, an annular plate is integrally formed at the top of the oil guide cover, a circular groove is formed in the inner bottom of the oil guide cover, a first spring is placed in the circular groove, the top of the first spring is propped against the bottom surface of the circular boss, and the annular plate is clamped on the first step; the oil cover is detachably connected with a plurality of spring seats, the spring seats are sleeved with second springs, and the top surfaces of the second springs are propped against the bottom surfaces of the piston steel skirts.
2. The split steel crown steel skirt piston of claim 1 wherein: the top of the annular round table is fixedly connected with a bulge, and the bottom of the piston steel skirt is provided with a jack opposite to the bulge.
3. The split steel crown steel skirt piston of claim 2 wherein: the first positioning hole is internally provided with threads, and the positioning piece is a bolt.
4. A split steel crown steel skirt piston according to claim 3 wherein: the heat dissipation holes are formed in the wall surface of the piston steel skirt where the piston pin seats are located; the ring grooves are densely arranged at positions close to the bottom of the piston steel skirt, and sparsely arranged at positions far away from the bottom of the piston steel skirt.
5. The split steel crown steel skirt piston of claim 4 wherein: the piston steel top is provided with a plurality of piston grooves, piston rings are embedded in the piston grooves, and the piston steel top is provided with a plurality of fine holes opposite to the ring grooves.
6. The split steel crown steel skirt piston of claim 5 wherein: the piston steel top integrated into one piece has annular cassette, the caulking groove that agrees with annular cassette has been seted up to piston steel skirt bottom.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810474278.0A CN108547707A (en) | 2018-05-17 | 2018-05-17 | Split type steel top steel skirt piston |
| CN2018104742780 | 2018-05-17 |
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| Publication Number | Publication Date |
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| CN109989846A CN109989846A (en) | 2019-07-09 |
| CN109989846B true CN109989846B (en) | 2024-05-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810474278.0A Pending CN108547707A (en) | 2018-05-17 | 2018-05-17 | Split type steel top steel skirt piston |
| CN201920687579.1U Active CN210003403U (en) | 2018-05-17 | 2019-05-14 | Split piston |
| CN201910401495.1A Active CN109989846B (en) | 2018-05-17 | 2019-05-14 | Split steel top steel skirt piston |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810474278.0A Pending CN108547707A (en) | 2018-05-17 | 2018-05-17 | Split type steel top steel skirt piston |
| CN201920687579.1U Active CN210003403U (en) | 2018-05-17 | 2019-05-14 | Split piston |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108547707A (en) * | 2018-05-17 | 2018-09-18 | 象山浦动机械科技有限公司 | Split type steel top steel skirt piston |
| CN109341175B (en) * | 2018-10-22 | 2021-10-12 | 广东广垦绿色农产品有限公司 | Freshness retaining device based on air pressure preservation and refrigeration |
| CN112901365B (en) * | 2021-02-10 | 2022-06-21 | 李斯特技术中心（上海）有限公司 | Combined type piston and engine |
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| JPS61272453A (en) * | 1985-05-24 | 1986-12-02 | エム・ア−・エヌ・−ベ−・ウント・ヴエ−・デイ−ゼル・ゲゼルシヤフト・ミツト・ベシユレンクテル・ハフツング | Plunger piston consisting of oil-cooled multiple section of internal combustion engine |
| CN102330617A (en) * | 2011-08-31 | 2012-01-25 | 李钢 | Adaptive variable compression engine piston |
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2018
- 2018-05-17 CN CN201810474278.0A patent/CN108547707A/en active Pending
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| CA1062565A (en) * | 1977-04-12 | 1979-09-18 | Thomas J. Pearsall | Variable compression ratio piston |
| CN85100321A (en) * | 1985-04-01 | 1985-09-10 | 大连海运学院 | Diesal engine with oil-cushioned piston |
| JPS61272453A (en) * | 1985-05-24 | 1986-12-02 | エム・ア−・エヌ・−ベ−・ウント・ヴエ−・デイ−ゼル・ゲゼルシヤフト・ミツト・ベシユレンクテル・ハフツング | Plunger piston consisting of oil-cooled multiple section of internal combustion engine |
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| CN210003403U (en) | 2020-01-31 |
| CN108547707A (en) | 2018-09-18 |
| CN109989846A (en) | 2019-07-09 |
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