CN116576035A - Engine and cylinder liner - Google Patents

Engine and cylinder liner Download PDF

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Publication number
CN116576035A
CN116576035A CN202310777799.4A CN202310777799A CN116576035A CN 116576035 A CN116576035 A CN 116576035A CN 202310777799 A CN202310777799 A CN 202310777799A CN 116576035 A CN116576035 A CN 116576035A
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CN
China
Prior art keywords
area
pits
cylinder liner
depth
preset
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CN202310777799.4A
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Chinese (zh)
Inventor
王勇
张红菊
王刚
王晨阳
朱强
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ZYNP Corp
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ZYNP Corp
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Priority to CN202310777799.4A priority Critical patent/CN116576035A/en
Publication of CN116576035A publication Critical patent/CN116576035A/en
Pending legal-status Critical Current

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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
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/004—Cylinder liners
    • 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 
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)

Abstract

The application relates to the technical field of engines, and particularly discloses an engine and a cylinder liner. By applying the engine and the cylinder liner provided by the application, the concave points with larger depth and thinner distribution density are adopted in the first area, so that the lean oil state can be improved, and the boundary lubrication is changed into mixed lubrication; the second area adopts pits with smaller depth and denser distribution density, so that the contact area is reduced, the thickness of an oil film is reduced, the friction coefficient in a dynamic pressure lubrication state is reduced, and further the oil consumption is reduced.

Description

Engine and cylinder liner
Technical Field
The application relates to the technical field of engines, in particular to an engine and a cylinder liner.
Background
Engines are important components of automobiles, including cylinder liners and pistons disposed within the cylinder liners, with the pistons reciprocating within the cylinders of the cylinder liners. The surface structure of the inner wall of the cylinder liner directly affects the wear resistance, lubricity and antifriction of the device.
With the increasing environmental protection policy, the emission requirements of engines are becoming increasingly stringent, and the cylinder liner, which is one of the important parts of the engine, must assist the complete machine in meeting the emission requirements. And the property parameters of the surface structure of the inner wall of the cylinder body can cause the conditions of increased oil consumption, unstable air leakage and the like of the engine, and the whole engine cannot reach the new emission standard.
In summary, how to effectively solve the problems of increased fuel consumption, unstable air leakage and the like of the engine caused by insufficient performance of the inner wall surface of the engine is a problem to be solved by those skilled in the art at present.
Disclosure of Invention
In view of the above, an object of the present application is to provide an engine and a cylinder liner that can effectively solve the problems of an increase in fuel consumption and an unstable air leakage of an engine due to insufficient performance of an inner wall surface of the engine.
In order to achieve the above purpose, the present application provides the following technical solutions:
the utility model provides a cylinder liner, includes the cylinder liner body, the inner wall of cylinder liner body has divided first region, second region and third region in proper order, at least first region and/or the second region is provided with a plurality of pits, just the degree of depth of the pit of first region is first default depth, arranges the area rate and is first default area rate, the degree of depth of the pit of second region is second default depth, arranges the area rate and is second default area rate, first default depth is greater than the second default depth, first default area rate is less than the second default area rate.
Optionally, in the cylinder liner, the first preset area rate ranges from 1% to 30%, and the second preset area rate ranges from 10% to 50%.
Optionally, in the cylinder liner, the first preset depth ranges from 3 μm to 10 μm, and the second preset depth ranges from 1 μm to 8 μm.
Optionally, in the cylinder liner, a maximum oil storage volume of each concave point is 0.006mm 3 。
Optionally, in the cylinder liner, a cross-sectional area of each of the pits is not more than 0.6mm 2 。
Optionally, in the cylinder liner, the third area is provided with the pits, the depth of the pits in the third area is the first preset depth, and the arrangement area rate is the first preset area rate.
Optionally, in the cylinder liner, a plurality of concave points are distributed in a plurality of rows along the circumferential direction of the inner wall of the cylinder liner body, a plurality of columns are distributed along the axial direction of the inner wall of the cylinder liner body, the concave points of every two adjacent rows are distributed in a staggered manner along the axial direction, and the concave points of no two adjacent columns are distributed in a staggered manner along the circumferential direction.
Optionally, in the cylinder liner, the length of the first region satisfies the following formula:
Ⅰ＝L2+aL1+b(L-L2+H)
wherein I is the length of the first area, L is the stroke of the piston, L1 is the fire bank height, L2 is the distance from the uppermost end to the lowermost end of each ring groove of the piston, H is the height of a first ring groove, a and b are both coefficients, a is more than 0.1 and less than 0.5, and b is more than 0.1;
when the starting point of the first area is that the piston moves to the top dead center, the fire bank height of the piston is more than a preset distance, and the preset distance d= (1-a) L1 is formed, wherein d is the preset distance;
the boundary between the second area and the third area is the position corresponding to the first ring groove of the piston when the piston runs to the bottom dead center;
the termination point of the third region is the lower end surface of the cylinder liner.
Optionally, in the cylinder liner, a basic reticulate pattern is arranged on the inner wall of the cylinder liner body, the average peak-to-valley height range of the basic reticulate pattern is 1-4.5 μm, the average peak-to-peak interval range is 20-52 μm, and the reticulate pattern axial included angle of the basic reticulate pattern is more than 135 DEG
The cylinder liner comprises a cylinder liner body, wherein a first area, a second area and a third area are sequentially formed in the inner wall of the cylinder liner body, a plurality of pits are formed in at least the first area and/or the second area, the depth of the pits in the first area is a first preset depth, the arrangement area rate is a first preset area rate, the depth of the pits in the second area is a second preset depth, the arrangement area rate is a second preset area rate, the first preset depth is larger than the second preset depth, and the first preset area rate is smaller than the second preset area rate.
By using the cylinder liner provided by the application, the inner wall of the cylinder liner body is divided into the first area, the second area and the third area according to the running state of the piston ring group, and a plurality of pits are formed in at least the first area and/or the second area, and pits with larger depth and thinner distribution density are adopted for the first area, so that the lean oil state can be improved, and the boundary lubrication is changed into mixed lubrication; the second area adopts pits with smaller depth and denser distribution density, so that the contact area is reduced, the thickness of an oil film is reduced, the friction coefficient in a dynamic pressure lubrication state is reduced, and further the oil consumption is reduced.
In order to achieve the above object, the present application also provides an engine comprising any one of the cylinder liners described above. Since the cylinder liner has the technical effects described above, an engine having the cylinder liner should have the corresponding technical effects.
Drawings
In order to more clearly illustrate the embodiments of the application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of a cylinder liner according to one embodiment of the present application in a partitioned manner;
FIG. 2 is a schematic diagram of a pit arrangement;
FIG. 3 is a schematic cross-sectional view of the cylinder liner of FIG. 2 at a recess;
FIG. 4 is a schematic view of another pit arrangement;
FIG. 5 is a schematic cross-sectional view of the cylinder liner of FIG. 4 at a recess.
The figures are marked as follows:
a first region 100, a second region 200, and a third region 300;
cylinder liner body 1, recess 11, piston 2.
Detailed Description
The embodiment of the application discloses an engine and a cylinder liner, which are used for improving the performance of the inner wall surface of the engine so as to reduce the oil consumption and the air leakage of the engine.
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Referring to FIG. 1, FIG. 1 is a schematic view of a cylinder liner according to one embodiment of the present application.
In one embodiment, the cylinder liner provided by the application comprises a cylinder liner body 1, wherein the inner wall of the cylinder liner body 1 is sequentially divided into a first area 100, a second area 200 and a third area 300, and at least the first area 100 and/or the second area 200 is provided with a plurality of pits 11. That is, pits 11 may be provided in each of the first area 100, the second area 200, and the third area 300; or pits 11 are provided in both the first area 100 and the second area 200, and pits 11 are not provided in the third area 300; or the second region 200 is provided with pits 11, and the first region 100 and the third region 300 are not provided with pits 11; or the first region 100 is provided with pits 11, and the second and third regions 200 and 300 are not provided with pits 11. No pits 11 are provided above the first region 100. The depth of the pits 11 in the first area 100 is a first preset depth, the arrangement area ratio is a first preset area ratio, the depth of the pits 11 in the second area 200 is a second preset depth, the arrangement area ratio is a second preset area ratio, the first preset depth is greater than the second preset depth, and the first preset area ratio is less than the second preset area ratio. The arrangement area ratio, i.e., the lost area ratio, means the ratio of the total lost area corresponding to each pit 11 on the inner wall to the total surface area corresponding to the inner wall. That is, the depth of the pits 11 in the first area 100 is larger, the distribution density is thinner, the depth of the pits 11 in the second area 200 is smaller, and the distribution density is denser. The inner wall surface texture of the cylinder liner body 1 is smooth, the friction resistance is small, meanwhile, texture grooves are shallow, oil storage is small, friction can be effectively reduced, oil consumption is reduced, the concave points 11 are arranged, lubricating oil can be better adhered in the concave points 11, so that the lubricating oil can flexibly stretch when an object moves, and smooth platform surfaces around the oil storage concave points 11 are supporting bodies for stretching the lubricating oil, so that a fluid dynamic lubricating oil film layer is formed. Therefore, the first region 100, the second region 200 and the third region 300 are divided according to the operation state of the piston ring set, and a plurality of pits 11 are formed in at least the first region 100 and/or the second region 200, so that the wear resistance and the lubrication requirement of the piston 2 when operating to different positions can be considered.
By using the cylinder liner provided by the application, the inner wall of the cylinder liner body 1 is divided into the first area 100, the second area 200 and the third area 300 according to the running state of the piston ring group, and a plurality of pits 11 are formed in at least the first area 100 and/or the second area 200, and the pits 11 with larger depth and thinner distribution density are adopted for the first area 100, so that the lean oil state can be improved, and the boundary lubrication is changed into mixed lubrication; the second area 200 adopts pits 11 with smaller depth and denser distribution density, reduces the contact area, reduces the thickness of an oil film, reduces the friction coefficient in a dynamic pressure lubrication state, and further reduces oil consumption.
In one embodiment, the cross-sectional area of the individual pits 11 of the second area 200 is not smaller than the cross-sectional area of the individual pits 11 of the first area 100. I.e. the cross-sectional area of the pits 11 of the first area 100 is smaller to improve the lean condition, the cross-sectional area of the pits 11 of the second area 200 is larger, the contact area is reduced, the oil film thickness is reduced, and the friction coefficient in the dynamic pressure lubrication condition is reduced.
In one embodiment, the first predetermined area ratio ranges from 1% to 30% and the second predetermined area ratio ranges from 10% to 50%. That is, the distribution density of pits 11 in the first area 100 is relatively thin, and the distribution density of pits 11 in the second area 200 is relatively dense.
In one embodiment, the first predetermined depth ranges from 3 to 10 μm and the second predetermined depth ranges from 1 to 8 μm. I.e. the depth of the pits 11 of the first area 100 is larger and the depth of the pits 11 of the second area 200 is smaller.
In one embodiment, the maximum oil storage volume of each pit 11 is 0.006mm 3 . The size of the pit 11 is controlled by setting the maximum oil storage volume of the pit 11.
In one embodiment, the cross-sectional area of each pit 11 is no greater than 0.6mm 2 . The shape of the pits 11 is not particularly limited in the present application, and the cross section of the pits 11 may be circular, polygonal, or the like. The size of the pits 11 is controlled by setting the cross-sectional area of the pits 11.
In one embodiment, the third area 300 is provided with pits 11, and the depth of the pits 11 of the third area 300 is a first preset depth, and the arrangement area ratio is a first preset area ratio. The third region 300 is provided with the same pits 11 as the first region 100 to achieve a similar effect.
In some embodiments, referring to fig. 2 and 3 and fig. 4 and 5, a plurality of concave points 11 are distributed in a plurality of rows along the circumferential direction of the inner wall of the cylinder liner body, and a plurality of columns are distributed along the axial direction of the inner wall of the cylinder liner body, the concave points 11 of each two adjacent rows are distributed along the axial direction in a staggered manner, and the concave points 11 of two adjacent columns are not distributed along the circumferential direction in a staggered manner. The pits 11 are divided into a plurality of rows and a plurality of columns, the pits 11 of each row are circumferentially arranged, the pits 11 of each column are axially arranged, the pits 11 are integrally spirally arranged, so that the pits 11 of the n+1th layer are positioned between the adjacent pits 11 of the n layer and are distributed in a 'delta' shape, namely, the pits 11 of the adjacent two rows are distributed in a staggered manner along the axial direction, and the pits 11 of the adjacent two columns are distributed in a staggered manner along the circumference, so that each pit 11 is relatively independent and sealed. The concave points 11 are arranged in the above way, so that the number of the concave points 11 is the largest, the area ratio is large, and the contact area between the concave points and the piston ring is reduced, namely the friction area of the piston ring is reduced, and the friction is reduced; when the lubricating oil is matched with a piston ring, the lubricating oil is uniform, and the problems of piston ring blowby, piston ring abrasion and the like are avoided.
In one embodiment, the length of the first region 100 satisfies the following equation:
Ⅰ＝L2+aL1+b(L-L2+H)
wherein I is the length of the first area 100, L is the stroke of the piston 2, L1 is the fire bank height, L2 is the distance from the uppermost end to the lowermost end of each ring groove of the piston 2, a and b are both coefficients, a is more than 0.1 and less than 0.5, and b is more than 0.1;
when the starting point of the first area 100 is that the piston 2 runs to the top dead center, the fire bank height of the piston 2 is more than a preset distance, and the preset distance d= (1-a) L1, wherein d is the preset distance, and a and L1 have the same meaning as those in the first area length calculation formula; the boundary between the second area 200 and the third area 300 is the position corresponding to the first ring groove of the piston 2 when the piston 2 runs to the bottom dead center; the termination point of the third region 300 is the lower end surface of the cylinder liner.
Referring to fig. 1, the first region 100 is located above a stroke center C, which is the center position of a standard stroke M. When the starting point of the standard stroke M is that the piston 2 runs to the upper dead point, the oil ring groove corresponds to the position; the standard stroke M end point is the corresponding position of the first ring groove when the piston 2 runs to the bottom dead center;
i.e. m=l-l2+h
Wherein L is the stroke of the piston 2, L2 is the distance from the uppermost end to the lowermost end of each ring groove of the piston 2, namely the distance from the uppermost end of the first ring groove to the lowermost end of the last ring groove, and H is the height of the first ring groove;
when the starting point of the first area 100 is that the piston 2 runs to the top dead center, the distance between the fire bank height of the piston 2 and (1-a) L1 is above; the length i of the first region 100 satisfies i=l2+al1+bm=l2+al1+b (L-l2+h), and the end point of the first region 100 can be obtained based on the start point of the first region 100 and the length of the first region 100. The starting point of the second area 200 is the ending point of the first area 100, the ending point of the second area 200 is the starting point of the third area 300, that is, the boundary point of the two, specifically, the position corresponding to the first ring groove of the piston 2 when the piston 2 runs to the bottom dead center. The termination point of the third region 300 is located at the lower end surface of the cylinder liner.
The first region 100 or more is a thermal land region of the piston 2, and since the piston ring cannot reach the region, abrasion does not occur, and thus the pit 11 is not provided in the first region 100 or more in terms of use and processing costs. The first area 100, the second area 200 and the third area 300 are divided by the above, and the same or different pits 11 on the three areas are arranged, so that different friction and lubricity can be provided at different positions of the sliding stroke of the piston 2 according to the running state of the piston 2, the sliding performance of the inner surface of a cylinder hole is improved to the greatest extent, the oil storage on the surface is uniform, the wear resistance of a cylinder sleeve and a piston ring pair is improved, and meanwhile, the antifriction and oil consumption reduction are realized.
Further, the second region 200 is provided with large, shallow and dense pits 11, the arrangement area ratio of the pits 11 is 10% -50%, and the oil storage volume of the single pits 11 is 0.00015-0.0048mm 3 The depth of the pits 11 is 1-8 μm, and the cross-sectional area of a single pit 11 is 0.15-0.6mm 2 The method comprises the steps of carrying out a first treatment on the surface of the The first region 100 and the third region 300 are provided with small, deep and thin pits 11, the area ratio of the pits 11 is 1% -30%, and the oil storage volume of the single pits 11 is 0.00045-0.006mm 3 The depth of the pits 11 is 3-10 μm.
In one embodiment, the inner wall of the cylinder liner body is provided with a basic reticulation, the average peak-to-valley height Rz of the basic reticulation ranges from 1 to 4.5 mu m, the average peak spacing S ranges from 20 to 52 mu m, and the reticulation axial included angle of the basic reticulation is larger than 135 degrees. The basic reticulate pattern is a smooth mirror surface reticulate pattern, the smoother the basic reticulate pattern is, the smaller the friction resistance is, meanwhile, the shallow oil storage of texture grooves is less, and the more obvious the antifriction and oil consumption reduction effects are. Based on the setting of pit 11, when the basic reticulation of inner wall adopts like setting up above, can be better with pit 11 cooperation, realize good antifriction and lubricated effect.
In one embodiment, the inner wall surface is polygonal, and the roundness of the 3-6 edges is not more than 3.5 μm, the roundness of the 7-9 edges is not more than 1 μm, the roundness of the 10-20 edges is not more than 0.35 μm, and the cylindricity of the inner surface is not more than 0.008mm. The base surface is machined to approximate a standard circle before machining the pits 11, but irregular vibration patterns and undulations appear on the circumference of the inner surface due to superposition of machining, which is called a polygon for effectively evaluating such irregularities, which is to amplify and subdivide the roundness into a plurality of undulations, the roundness error limit value of the Undulation (UPR) numerical range of each circumference is calculated using the attenuation function of EQ 1. By making the above definition for the parameters of the polygon, the more accurate the control of the basic surface shape is, the more favorable is the lubrication effect and the air tightness when the engine works.
The cylinder liner in each embodiment can be manufactured by processing in a mode of pit pre-processing, pit forming processing and pit post-processing, and specifically comprises the following steps:
s1: and machining before pits, namely performing allowance-removing profiling machining and forming machining on the inner holes and the outer circles of the cylinder sleeve blank by adopting a high-precision machine tool, wherein the specific process flow comprises rough machining, semi-finishing, pre-finishing honing the inner holes and finishing honing the inner holes. And before pit machining, pre-finishing honing and finishing honing are carried out on the whole surface of the inner wall of the cylinder liner, so that the requirements of the cylindricity and the polygon of the inner hole and the requirements of basic texture parameters are met.
S2: and (3) pit forming processing, namely placing the large opening of the cylinder liner obtained in the step (S1) on a positioning seat of equipment downwards, and gasifying and impacting the inner wall of the cylinder liner to form a plurality of pits by means of laser etching, angular sand blasting, abrasive gas jet flow and the like.
Specifically, the pits are integrally spirally distributed, and a blowing device is added for synchronous blowing in the processing process, so that the bottoms of the formed pits are ensured not to retain metal residues.
S3: and (3) pit post-treatment, namely, polishing the whole cylinder hole by using polishing sand strips and other equipment, and removing residual scum around pits on the inner wall. Ensuring that the peak top roughness Rpk of the inner surface texture is less than or equal to 0.15 mu m.
And gasifying and impacting the inner wall of the cylinder sleeve by means of laser etching, angular sand blasting, abrasive gas jet flow and the like to form a plurality of pits. The concave points on the inner wall are uniform in structure, and the groove depth is consistent and high in stability.
In order to more clearly illustrate the effect of the pit arrangement in the different areas of the above embodiments, several specific embodiments are described below.
Example 1
In the embodiment 1, the first area is a low-speed area of piston operation, the starting point is a position above the thermal bank height of the piston, the distance from the upper surface of the cylinder sleeve supporting shoulder is 10mm, the whole length is 30mm, the second area is a high-speed area of piston operation, and the whole length is 103mm; the third area is a low-speed area of piston operation, the starting point is the position of the ending point of the second area, and the whole length is 65mm from the ending point to the lower end surface of the cylinder sleeve. The first area, the second area and the third area are all provided with pits, and the starting point of the first area is upwards provided with no pits.
The starting point of the first area is that the vicinity of the piston fire bank height is upward, namely, the preset distance is more than the piston fire bank height, the preset distance is (1-a) L1=10.2, and the result is rounded;
the first zone length i=l2+al1+bm=l2+al1+b (L-l2+h) =25+0.32×15=29.8, the result is rounded, where l2=25, a=0.32, b=0, l=125, l1=15, h=2.5. M=l-l2+h=125-25+2.5=102.5, the result is rounded.
The pits of the inner wall surface are distributed by adopting staggered spiral lines, and the cross-sectional area of a single pit in the first area is 0.15mm 2 Single pit oil storage volume 0.0006-0.0012mm 3 The depth is 4-8 mu m, and the arrangement area ratio of pits is 1.5%; the cross-sectional area of the individual pits in the second area is 0.15mm 2 A single pit oil storage volume 0.000225-0.00045mm 3 The depth is 1.5-3.0 μm, and the arrangement area ratio of pits is 12%; the third region has the same pit density and arrangement as the first region. The starting point of the first area is upward without pits. The basic texture parameter of the inner wall of the cylinder liner is average peak-valley height rz=3.52 mu m, average peak interval S=38 mu m, and the axial included angle of the reticulation is 150 degrees, so that the whole inner wall surface has uniform texture.
The cylinder liner is specifically prepared according to the following steps:
and (3) machining before pits, namely performing allowance-removing profiling machining and forming machining on the inner hole and the outer circle of the cylinder sleeve blank by adopting a high-precision machine tool, wherein the specific process flow comprises rough machining, semi-finishing, pre-finishing honing the inner hole and finish honing the inner hole. Before pit processing, pre-finish honing and finish honing are carried out on the whole surface of the inner wall of the cylinder sleeve, so that the cylindricity of the inner surface is 0.005mm, and the inner hole is polygonal: the 3-6 edges are not more than 3 mu m, the 7-9 edges are not more than 0.8 mu m, and the 10-20 edges are not more than 0.3 mu m; and (3) basic texture parameter requirements.
And (3) pit forming processing, namely placing the cylinder liner obtained in the steps with the large opening facing downwards on a laser equipment positioning seat, gasifying and impacting the inner wall of the cylinder liner by using a laser, and performing pit processing from top to bottom. Specific laser parameters: the optical fiber laser is adopted, and the power is as follows: 50W, frequency: 50KHz, focal length: 5mm. The plurality of pits are divided into a plurality of rows and a plurality of columns, the pits of each row are arranged along the circumference, the pits of each column are arranged along the axial direction, each pit of two adjacent rows and each pit of two adjacent columns are arranged in a staggered manner, the circumferences of the interlaced pits are aligned, and each pit of the spaced columns is aligned radially. The pits are integrally spirally distributed, so that the n+1th layer of pits are positioned between the adjacent two pits of the n layer to form a ' Chinese character ' pin ', and each pit is relatively and independently sealed, thereby reducing the contact area between the piston ring and the cylinder wall surface and achieving the effects of friction reduction and oil consumption reduction. And a blowing device is added in the laser carving process to perform synchronous blowing, so that the formed micro-pit bottom is ensured not to remain metal residues.
And (3) pit post-treatment, namely, integrally polishing cylinder holes by using a sponge sand strip, and removing residual scum around the laser pits on the inner wall. Polishing reaches the peak top roughness Rpk of the inner surface: 0.06-0.12 μm.
Example 2
In example 2, the starting point is the position above the elevation of the piston fire bank, 8mm above the bearing shoulder of the cylinder sleeve, and the whole length is 24mm; the overall length of the second region is 151mm; the starting point of the third area is the position of the ending point of the second area, and the whole length of the ending point reaches 66mm from the lower end surface of the cylinder liner. The first area and the second area are provided with pits, and the starting point of the first area is upward and the third area is not provided with pits.
The starting point of the first area is the preset distance of the piston fire bank height upwards, the specific preset distance (1-a) is L1=7.5, and the result is rounded; the first zone length i=l2+al1+bm=l2+al1+b (L-l2+h) =19.5+0.25×10+0.01× (170-19.5+3) = 23.535, and the result is rounded; where l2=19.5, a=0.25, b=0.01, l=170, l1=10, h=3 are taken. M=l-l2+h=170-19.5+3=153.5, the result is rounded;
the pits on the inner wall surface adopt staggered spiral lines respectively, and the cross-sectional area of a single pit in the first area is 0.1mm 2 The oil storage volume of single pit is 0.0004-0.0008mm 3 The depth is 4-8 mu m, and the arrangement area ratio of pits is 1.8%; the cross-sectional area of the individual pits in the second area is 0.2mm 2 The oil storage volume of a single pit is 0.00028-0.00056mm 3 The depth is 1.4-2.8 mu m, and the arrangement area ratio of pits is 17%; the starting point of the first area is upward and the third area is not provided with pits. The basic texture parameter of the inner wall of the cylinder liner is average peak-valley height rz=2.8 mu m, average peak interval S=32 mu m and axial included angle of reticulation is 155 degrees, so that the whole inner wall surface has uniform texture.
The preparation method of the cylinder liner and the like is the same as that of the cylinder liner in example 1, and is not repeated here.
In order to more clearly illustrate the effect of the pit arrangement in the different areas of the above examples, examples 3-6 and comparative examples are described below. In example 3, pits were provided in the first region, the second region, and the third region, example 4, in which pits were provided in the first region and the second region, respectively, the third region was not provided with pits, example 5, in which pits were provided in the second region, the first region and the third region were not provided with pits, example 6, in which pits were provided in the first region, and the second region and the third region were not provided with pits. The first, second and third areas of the inner wall of the cylinder liner in examples 3 to 6 are divided identically to the three areas in example 1, and the inner wall of the cylinder liner is obtained by processing the same preparation method as in example 1, wherein the average peak-to-valley height Rz of the basic texture of the inner wall is 2.8-3.52 μm, the average peak interval S is 30-38, the axial included angle of the reticulate pattern is 150 degrees, and the concave point state of the inner wall is specifically as follows:
example 3
The individual pit cross-sectional area of the first and third regions was 0.1mm 2 Single pit oil storage volume 0.00065mm 3 The arrangement area ratio of pits is 1.8%; the individual pit cross-sectional area of the second region was 0.2mm 2 The oil storage volume of a single pit is 0.0003mm 3 The arrangement area ratio of pits is 17%.
Example 4
The cross-sectional area of the individual pits of the first area is 0.1mm 2 The oil storage volume of a single pit is 0.00065mm 3 The arrangement area ratio of pits is 1.8%; the cross-sectional area of the individual pits of the second area is 0.2mm 2 The oil storage volume of a single pit is 0.0003mm 3 The arrangement area ratio of pits is 17%.
Example 5
The cross-sectional area of the individual pits of the second area is 0.2mm 2 The oil storage volume of a single pit is 0.0003mm 3 The arrangement area ratio of pits is 17%.
Example 6
The cross-sectional area of the individual pits of the first area is 0.1mm 2 The oil storage volume of a single pit is 0.00065mm 3 The arrangement area ratio of pits is 1.8%.
Comparative example
The average peak-to-valley height Rz of the inner wall basic texture ranges from 5 to 7 mu m, and the axial included angle of the reticulate pattern is 135 degrees.
The cylinder liners of examples 3 to 6 and comparative examples were tested under the following specific test conditions:
model 13L diesel engine, alloy bainite cylinder sleeve, steel piston, DLC ring;
full-speed full-load experiment tests abrasion loss and oil consumption, and rotating speed: rated rotational speed nt=1800 rpm, load: the accelerator is fully opened, and the running duration is 1000 hours;
the reverse drag experiment measures the reverse drag work (friction work), the rotation speed: the variable frequency control is adopted, the engine is not supplied with oil, and the reverse dragging device drags the engine to stably operate at any rotating speed of 150-7200r/min;
power: 30-110kw;
analog quantity: torque 4-20mA output;
and (2) mounting: the dynamometer, the reverse dragging motor and the dynamometer end support are required to be arranged on the same iron bottom plate. The torque meter is placed between the reverse towing motor and the overrunning clutch.
The friction work, abrasion loss and fuel consumption obtained by the test are shown in table 1.
Table 1 comparison of test results of examples 3 to 6 and comparative examples
It can be seen that the frictional work of the cylinder liners in examples 3 to 6 was reduced by taking the frictional work detected by the conventional textured cylinder liner test as standard 1; the abrasion loss detected by the conventional reticulate pattern cylinder liner test is taken as a standard 1, the abrasion loss of the cylinder liners in the examples 3 to 6 is reduced, and the abrasion loss reduction amplitude is the largest in the example 3; the fuel consumption of the cylinder liners of examples 3 to 6 was also reduced by taking the fuel consumption detected by the conventional reticulate pattern cylinder liner test as standard 1.
Based on the cylinder liner provided in the above embodiments, the present application also provides an engine including any one of the cylinder liners of the above embodiments. Since the engine employs the cylinder liner of the above embodiment, the engine is advantageous with reference to the above embodiment.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. The cylinder liner is characterized by comprising a cylinder liner body, wherein a first area, a second area and a third area are sequentially divided into the inner wall of the cylinder liner body, at least the first area and/or the second area are/is provided with a plurality of pits, the depth of each pit in the first area is a first preset depth, the arrangement area rate is a first preset area rate, the depth of each pit in the second area is a second preset depth, the arrangement area rate is a second preset area rate, the first preset depth is larger than the second preset depth, and the first preset area rate is smaller than the second preset area rate.
2. The cylinder liner of claim 1, wherein the first predetermined area ratio is in the range of 1% to 30% and the second predetermined area ratio is in the range of 10% to 50%.
3. The cylinder liner of claim 1, wherein the first predetermined depth ranges from 3 to 10 μm and the second predetermined depth ranges from 1 to 8 μm.
4. A cylinder liner according to claim 1, wherein each of the pits has a maximum oil storage volume of 0.006mm 3 。
5. A cylinder liner according to claim 1, wherein each of the pits has a cross-sectional area of no more than 0.6mm 2 。
6. The cylinder liner of claim 1, wherein the third region is provided with the pits, and the depth of the pits in the third region is the first predetermined depth, and the arrangement area ratio is the first predetermined area ratio.
7. The cylinder liner of claim 1, wherein a plurality of the pits are distributed in a plurality of rows along the circumferential direction of the inner wall of the liner body, and a plurality of columns are distributed along the axial direction of the inner wall of the liner body, the pits of each adjacent two rows being distributed in an axially offset manner, and the pits of no adjacent two columns being distributed in a circumferentially offset manner.
8. A cylinder liner according to any one of claims 1 to 7, wherein the length of the first region satisfies the following formula:
Ⅰ＝L2+aL1+b(L-L2+H)
wherein I is the length of the first area, L is the stroke of the piston, L1 is the fire bank height, L2 is the distance from the uppermost end to the lowermost end of each ring groove of the piston, H is the height of a first ring groove, a and b are both coefficients, a is more than 0.1 and less than 0.5, and b is more than 0.1;
when the starting point of the first area is that the piston moves to the top dead center, the fire bank height of the piston is more than a preset distance, and the preset distance d= (1-a) L1 is formed, wherein d is the preset distance;
the boundary between the second area and the third area is the position corresponding to the first ring groove of the piston when the piston runs to the bottom dead center;
the termination point of the third region is the lower end surface of the cylinder liner.
9. Cylinder liner according to any one of claims 1 to 7, characterized in that the inner wall of the cylinder liner body is provided with basic texture, and that the basic texture has an average peak-to-valley height in the range of 1 to 4.5 μm and an average peak-to-peak spacing in the range of 20 to 52 μm, and that the basic texture has a texture axial included angle of more than 135 °.
10. An engine comprising a cylinder liner according to any one of claims 1 to 9.
CN202310777799.4A 2023-06-28 2023-06-28 Engine and cylinder liner Pending CN116576035A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310777799.4A CN116576035A (en) 2023-06-28 2023-06-28 Engine and cylinder liner

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310777799.4A CN116576035A (en) 2023-06-28 2023-06-28 Engine and cylinder liner

Publications (1)

Publication Number Publication Date
CN116576035A true CN116576035A (en) 2023-08-11

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Family Applications (1)

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Country Link
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