CN111255592A - Piston of alcohol fuel internal combustion engine - Google Patents
Piston of alcohol fuel internal combustion engine Download PDFInfo
- Publication number
- CN111255592A CN111255592A CN202010253431.4A CN202010253431A CN111255592A CN 111255592 A CN111255592 A CN 111255592A CN 202010253431 A CN202010253431 A CN 202010253431A CN 111255592 A CN111255592 A CN 111255592A
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- China
- Prior art keywords
- piston
- combustion engine
- internal combustion
- pin hole
- oil
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Classifications
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- 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
- F02F3/28—Other pistons with specially-shaped head
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- 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
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- 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
- F02F3/10—Pistons having surface coverings
- F02F3/12—Pistons having surface coverings on piston heads
- F02F3/14—Pistons having surface coverings on piston heads within combustion chambers
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- 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
- F02F3/16—Pistons having cooling means
- F02F3/20—Pistons having cooling means the means being a fluid flowing through or along piston
- F02F3/22—Pistons having cooling means the means being a fluid flowing through or along piston the fluid being liquid
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
The invention relates to a piston of an alcohol fuel internal combustion engine. At present, the piston of the traditional gasoline engine can be corroded by alcohol fuel and combustion products thereof in an alcohol internal combustion engine, meanwhile, the alcohol internal combustion engine has high compression ratio, high explosion pressure and high instantaneous temperature, the top of the piston and the head of the piston of the gasoline engine are easy to ablate at high temperature, and the heat insulation and heat resistance are poor. A piston of an alcohol fuel internal combustion engine comprises the following components: the piston comprises a piston top (1), a piston head (2), a piston skirt (6) and a piston pin seat (8), wherein the piston top is a forming top, the cross section of a convex part is approximate to a waist-round shape, the rest part is of a flat top structure, a valve avoiding pit is arranged on the piston top, the piston head mainly comprises a rectangular fire bank, two gas ring grooves (3) and an oil ring groove (4), the two gas ring grooves are filled with gas rings for sealing and heat conduction, and the oil ring groove is filled with a combined oil ring for oil scraping and oil distribution and auxiliary gas sealing. The invention is applied to the alcohol fuel internal combustion engine.
Description
The technical field is as follows:
the invention relates to a piston of an alcohol fuel internal combustion engine.
Background art:
with the increasing energy crisis and air pollution problems, the internal combustion engine industry is actively seeking clean alternative fuels. Alcohols are considered to be one of the most promising clean alternative fuels for internal combustion engines, because the physicochemical properties of the alcohols are similar to those of gasoline, and the alcohols can be extracted from plants and belong to renewable energy sources; the octane value of the alcohols is high, the antiknock property is good, and the combustion products are free of pollution; the adoption of alcohol fuel can alleviate the energy contradiction and reduce the pollution, so that the alcohol fuel is currently paid more attention by various countries.
Because the octane number of the alcohol is high and the antiknock property is good, the internal combustion engine can adopt higher compression ratio to improve the power, the torque and the like of the internal combustion engine, and the piston is required to have higher mechanical strength; the alcohol combustion products are acidic and have a corrosive effect on the piston of the internal combustion engine, and meanwhile, the alcohol fuel and the alcohol combustion products can dilute and deteriorate lubricating oil, so that the lubricating environment of the piston in a cylinder hole is influenced.
The prior art has the following defects:
(1) at present, the piston is basically a piston of a traditional gasoline and diesel internal combustion engine at home, and the piston technology of an alcohol fuel internal combustion engine is basically blank.
(2) The piston of a conventional gasoline engine is corroded by alcohol fuel and its combustion products in the alcohol internal combustion engine.
(3) The alcohol internal combustion engine has high compression ratio, large explosion pressure and high instantaneous temperature, and the top and the head of the piston of the traditional gasoline engine are easy to ablate at high temperature, so that the heat insulation and the heat resistance are poor.
(4) The alcohol fuel and the combustion products thereof dilute and deteriorate lubricating oil in the cylinder hole, and the lubricating property and the cooling property of the traditional piston in the cylinder are reduced, so that the faults of cylinder pulling and the like are easily caused.
(5) The piston of the traditional gasoline engine has large relative mass, low mechanical strength and low bearable explosion pressure.
The invention content is as follows:
the invention aims to provide a piston of an alcohol fuel internal combustion engine, which has the advantages of high mechanical strength, high corrosion resistance, high wear resistance and the like.
The above purpose is realized by the following technical scheme:
a piston of an alcohol fuel internal combustion engine comprises the following components: the piston top forms one part of a combustion chamber of an internal combustion engine and bears high temperature and high pressure of fuel combustion, the piston top is a forming top, the cross section of a convex part is approximate to a waist-round shape, the rest part is a flat-top structure, a valve avoiding pit is arranged on the piston top, the piston head mainly comprises a rectangular fire bank, two gas ring grooves and an oil ring groove, the two gas ring grooves are filled with gas rings for sealing and heat conduction, the oil ring groove is filled with a combined oil ring for oil scraping, oil distribution and auxiliary air sealing, a round oil return hole is arranged in the oil ring groove 4, an opening of the round oil return hole is communicated with the top end of the piston skirt through the middle upper part of the oil ring groove, and the piston skirt is of a semi-slipper type and lightens the mass of the piston; the skirt molded lines are in an elliptical shape in the circumferential direction and in an asymmetric barrel surface shape in the longitudinal direction, and the outer side wall of the piston pin boss and the inner cavity of the piston are provided with latticed reinforcing ribs to enhance the mechanical strength of the piston. .
In the piston of the alcohol fuel internal combustion engine, the piston pin seat is provided with a piston pin hole which is a special-shaped pin hole, the diameter of the piston pin hole is increased from two ends to the axial direction of the piston from the axial direction of the piston pin hole, the center line of the piston pin hole deviates to the side subjected to lateral pressure in the power stroke, and the piston pin runs in the piston pin hole at a high speed.
According to the piston of the alcohol fuel internal combustion engine, the surface wear resistance of the piston pin hole is enhanced by the anodic oxidation layer on the inner surface of the piston pin hole, the whole surface of the piston is subjected to anodic oxidation treatment, and the thickness of the oxidation layer is 12 microns. The surface wear resistance is enhanced, the high temperature is effectively isolated, and the corrosion of fuel and combustion products is prevented.
The invention has the beneficial effects that:
1. the whole surface of the invention is anodized, which can isolate the high temperature of the combustion chamber at the top of the piston and prevent the piston from ablation; the alcohol fuel and combustion products can be prevented from corroding the piston body; the wear resistance and self-lubricity of the piston skirt surface and the piston pin bore surface can be increased.
The piston top is a formed top, so that the form of a combustion chamber is changed, and the combustion requirement of alcohol fuels is better met. Redundant lubricating oil on the cylinder wall can flow back to the oil pan through an oil return hole in the oil ring groove, so that the phenomenon of engine oil burning is prevented.
The molded line of the piston skirt part of the invention shows an elliptical shape in the circumferential direction and an asymmetric barrel surface shape in the longitudinal direction, thereby ensuring that the piston still has a reasonable fit clearance with a cylinder hole after being heated and expanded or deformed by load, and reducing the occurrence of faults such as cylinder scuffing and the like. The skirt part of the piston is in a half slipper type, so that the mass is reduced, the elasticity is increased, the piston is suitable for a high-speed internal combustion engine, and the reciprocating inertia force is reduced.
The piston pin hole seat and the piston inner cavity are provided with the latticed reinforcing ribs, so that the integral mechanical strength of the piston can be ensured. The central line of the piston pin hole deviates to the side which is pressed by the side in the power stroke, so that the piston can stably move and change direction in the cylinder, and the occurrence of the cylinder knocking phenomenon is reduced. The piston pin hole is a horn-shaped special-shaped pin hole, so that the stress distribution of the pin hole can be uniform, and the bearing capacity of the pin hole is improved.
Description of the drawings:
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic view of the structure of the piston skirt.
Fig. 3 is a cross-sectional view of fig. 2.
Fig. 4 is a top view of fig. 1.
Fig. 5 is a bottom view of fig. 1.
In the figure: 1. the piston comprises a piston top, 2, a piston head, 3, a gas ring groove, 4, an oil ring groove, 5, an oil return hole, 6, a piston skirt, 7, a reinforcing rib, 8, a piston pin seat, 9 and a piston pin hole.
The specific implementation mode is as follows:
example 1:
a piston of an alcohol fuel internal combustion engine comprises the following components: the piston comprises a piston top 1, a piston head 2, a piston skirt 6 and a piston pin boss 8, wherein the piston top forms a part of a combustion chamber of the internal combustion engine, the piston top is a forming top, wherein the cross section of the convex part is similar to a waist-round shape, the rest part is a flat-top structure, the top of the piston is provided with an air valve avoiding pit, the piston head is mainly composed of a rectangular fire bank, two gas ring grooves 3 and an oil ring groove 4, the two gas ring grooves are filled with gas rings for sealing and heat conduction, the oil ring groove is provided with a combined oil ring for oil scraping, oil distributing and auxiliary gas sealing, a circular oil return hole 5 is arranged in the oil ring groove, the opening of the piston pin is communicated with the top end of the piston skirt part through the middle upper part of the oil ring groove and the inner cavity of the piston, the piston skirt part is in a semi-slipper type, the molded line of the skirt part is in an oval shape in the circumferential direction and is in an asymmetric barrel surface shape longitudinally, and the outer side wall of the piston pin seat and the inner cavity of the piston are provided with grid-shaped reinforcing ribs 7.
Example 2:
according to the piston of the alcohol fuel internal combustion engine of the embodiment 1, the piston pin hole 9 is formed in the piston pin boss, the piston pin hole is a special-shaped pin hole, the diameter of the piston pin hole is increased from two ends to the axial direction of the piston from the axial direction of the piston pin hole, the center line of the piston pin hole deviates to the side receiving the side pressure in the power stroke, and the piston pin runs in the piston pin hole at a high speed.
Example 3:
the piston for an alcohol fuel internal combustion engine according to embodiment 1 or 2, characterized in that: the surface wear resistance of the piston pin hole is enhanced by the anodic oxidation layer on the inner surface of the piston pin hole, the whole surface of the piston is subjected to anodic oxidation treatment, and the thickness of the oxidation layer is 12 micrometers.
Claims (3)
1. A piston of an alcohol fuel internal combustion engine comprises the following components: piston top, piston head, piston skirt portion and piston key seat, characterized by: piston crown constitute the partly of internal-combustion engine combustion chamber, piston crown be the shaping top, wherein bulge cross sectional shape is similar waist circular, and the rest is the flat top structure, piston crown be equipped with the valve and dodge the hole, piston head mainly constitute by rectangle firepower bank, twice gas ring annular and oil ring annular, twice gas ring annular pack into gas ring seal heat conduction, the oil ring annular pack into combination oil ring frizing oil distribution, supplementary gas seal, oil ring annular 4 in have circular oil return hole, its opening is through oil ring annular in upper portion and piston skirt portion top and piston inner chamber link up, piston skirt portion be half slipper formula, the skirt molded lines are oval-shaped in circumference, vertically be asymmetric barrel face form, piston pin boss lateral wall and piston inner chamber be equipped with latticed strengthening rib.
2. The piston for an alcohol-fueled internal combustion engine according to claim 1, wherein: the piston pin seat is provided with a piston pin hole which is a special-shaped pin hole, the diameter of the piston pin hole is increased from two ends to the axial direction of the piston from the axial direction of the piston pin hole, the central line of the piston pin hole deviates to the side which is subjected to lateral pressure in the power stroke, and the piston pin rotates in the piston pin hole at a high speed.
3. The piston for an alcohol-fueled internal combustion engine according to claim 2, wherein: the surface wear resistance of the piston pin hole is enhanced by the anodic oxidation layer on the inner surface of the piston pin hole, the whole surface of the piston is subjected to anodic oxidation treatment, and the thickness of the oxidation layer is 12 micrometers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010253431.4A CN111255592A (en) | 2020-04-02 | 2020-04-02 | Piston of alcohol fuel internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010253431.4A CN111255592A (en) | 2020-04-02 | 2020-04-02 | Piston of alcohol fuel internal combustion engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111255592A true CN111255592A (en) | 2020-06-09 |
Family
ID=70953344
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010253431.4A Pending CN111255592A (en) | 2020-04-02 | 2020-04-02 | Piston of alcohol fuel internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111255592A (en) |
-
2020
- 2020-04-02 CN CN202010253431.4A patent/CN111255592A/en active Pending
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