CN109236486A - Internal combustion engine novel steel pistons and internal combustion engine - Google Patents
Internal combustion engine novel steel pistons and internal combustion engine Download PDFInfo
- Publication number
- CN109236486A CN109236486A CN201811301315.4A CN201811301315A CN109236486A CN 109236486 A CN109236486 A CN 109236486A CN 201811301315 A CN201811301315 A CN 201811301315A CN 109236486 A CN109236486 A CN 109236486A
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- China
- Prior art keywords
- piston
- internal combustion
- combustion engine
- novel steel
- steel pistons
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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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
- F02F3/0015—Multi-part pistons
- F02F3/003—Multi-part pistons the parts being connected by casting, brazing, welding or clamping
-
- 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
- F02F3/26—Pistons having combustion chamber in piston head
-
- 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
-
- 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
- F02F3/003—Multi-part pistons the parts being connected by casting, brazing, welding or clamping
- F02F2003/0061—Multi-part pistons the parts being connected by casting, brazing, welding or clamping by welding
Landscapes
- 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)
Abstract
The present invention provides a kind of internal combustion engine novel steel pistons and internal combustion engine, wherein, internal combustion engine includes piston crown and piston skirt with novel steel pistons, piston skirt includes: the piston boss and piston pin hole being equipped with, the central axis of piston pin hole and the central axis upright of the novel steel pistons of internal combustion engine, piston pin hole upside are formula pressure-bearing surface structure free of discontinuities.According to the technical solution of the present invention, improve the bearing capacity on piston pin hole top, reduce that piston pin hole is glued, pulls and the generation of Cracking Failure phenomenon, improves the reliability and service life of piston entirety, be conducive to reliability, economy and the durability of promotion internal combustion engine complete machine.
Description
Technical field
The present invention relates to piston technical fields, in particular to a kind of internal combustion engine novel steel pistons and a kind of internal combustion
Machine.
Background technique
In internal combustion engine, piston is as the kernel component moved back and forth in cylinder, and operating condition is the harshest, work
Make maximum intensity, high thermic load, mechanical load and strong fretting wear is subject, often in high temperature, high load capacity, height
In the case where speed, insufficient lubrication, cooling difficulty, various failures are also easy to produce, directly affect the performance, economy, reliability of complete machine
And durability.
In the related technology, steel pistons pin hole top uses traditional two-part pressure-bearing surface structure, living under high explosion pressure
The pressure that plug pin hole top is born is huge, and piston pin hole gluing easily occurs, pulls even Cracking Failure, influences the reliable of complete machine
Property, economy and durability.
Summary of the invention
The present invention is directed to solve at least one of the technical problems existing in the prior art or related technologies.
For this purpose, it is an object of the present invention to provide a kind of novel steel pistons of internal combustion engine.
It is another object of the present invention to provide a kind of internal combustion engines.
To achieve the goals above, technical solution of the present invention provides a kind of internal combustion engine novel steel pistons, including work
Plug head and piston skirt, piston skirt include: the piston boss and piston pin hole being equipped with, the central axis of piston pin hole
With the internal combustion engine central axis upright of novel steel pistons, piston pin hole upside is formula pressure-bearing surface structure free of discontinuities.
In the present solution, by the central axis of piston pin hole and the central axis upright of the novel steel pistons of internal combustion engine, it is living
It is formula pressure-bearing surface structure free of discontinuities on the upside of plug pin hole, improves the bearing capacity on piston pin hole top, reduce piston pin hole glue
It closes, pull and the generation of Cracking Failure phenomenon, improve the reliability and service life of piston entirety, be conducive to promote internal combustion
Reliability, economy and the durability of machine complete machine.
Preferably, there are the annular oil cavity and circular cavity being equipped in piston crown；The outer circle of piston crown is inward-facing
Spill is at piston ring groove；It concaves to form combustion chamber among the top surface of piston crown.
In the present solution, by having the annular oil cavity being equipped with and circular cavity as inner-cooling oil recess in piston crown, it can
It to realize effective cooling, concaves to form piston ring groove by the periphery of piston crown, is conducive to strike off on casing wall
Lubricating oil reduces the loss of lubricating oil, by concaving to form combustion chamber among the top surface of piston crown, is advantageously implemented fuel
Active combustion, realize the function of piston, and convenient processing and manufacture.
Preferably, piston skirt further include: the first oilhole is run through between annular oil cavity and circular cavity, the first oilhole
Central axis upright in the central axis of piston pin hole, the central axis and internal combustion engine of the first oilhole are in novel steel pistons
Mandrel line is in angle；Second oilhole, runs through between circular cavity and piston pin hole, the central axis and internal combustion engine of the second oilhole
With the centerline axis parallel of novel steel pistons.
In the present solution, by running through the first oilhole between annular oil cavity and circular cavity, the central axis of the first oilhole
Perpendicular to the central axis of piston pin hole, the central axis and internal combustion engine of the first oilhole be in line with the central axis of novel steel pistons
Angle has penetrated through annular oil cavity and circular cavity, is advantageously implemented the left and right flowing of lubricating oil and teetertotters, realizes in being used as
Effective cooling of cold oil chamber, and occupy little space, compressive property is improved, by running through circular cavity and piston pin
The second oilhole between hole, the central axis of the second oilhole and the centerline axis parallel of the novel steel pistons of internal combustion engine can incite somebody to action
Parts of lubricating oil imports piston pin hole and plays certain lubricating action, is conducive to the cooperation fortune between piston pin hole and piston pin
It is dynamic, further improve the whole service life of piston.
Preferably, the first oilhole is arranged two, and the central axis of two the first oilholes is about the novel steel pistons of internal combustion engine
Central axis it is symmetrical.
In the present solution, be arranged two by the first oilhole, the central axis of two the first oilholes is about internal combustion engine with novel
The central axis of steel pistons is symmetrical, is further conducive to cooling and moderate lubrication oil enters piston pin hole lubrication, Er Qiezhan
It is small with space, improve compressive property.
Preferably, piston skirt further include: fuel feed hole and oil outlet are respectively arranged on the two sides of piston pin hole, and fuel feed hole goes out
Oilhole is penetrated through with the annular oil cavity of corresponding side respectively.
In the present solution, by the fuel feed hole and oil outlet of the two sides for being respectively arranged on piston pin hole, fuel feed hole, oil outlet difference
It is penetrated through with the annular oil cavity of corresponding side, realizes the oil inlet of the novel steel pistons of internal combustion engine and fuel-displaced, integrally resist in promotion piston
While pressing performance, effective operation of inner-cooling oil recess, cooling have been ensured.
Preferably, internal combustion engine is integral type steel pistons with novel steel pistons.
In the present solution, with novel steel pistons being integral type steel pistons by internal combustion engine, compressive property is further improved, into
One step improves the reliability and service life of piston entirety, is conducive to be promoted the reliability of internal combustion engine complete machine, economy and resistance to
Long property.
Preferably, piston crown and piston skirt are alloy steel piece, friction welding between piston crown and piston skirt.
In the present solution, being alloy steel piece by piston crown and piston skirt, so that the intensity of piston entirety is high, heat is swollen
It is swollen small, by friction welding between piston crown and piston skirt, compressive property is further improved, piston is further improved
Whole reliability and service life is conducive to the reliability, economy and the durability that promote internal combustion engine complete machine.
Preferably, piston ring groove includes twice compression oil ring groove with together with, and compression, compression ring are followed successively by under by top
Slot, oil ring groove.
In the present solution, including twice compression oil ring groove with together with by piston ring groove, compression ring is followed successively by under by top
Slot, compression, oil ring groove are conducive to strike off the lubricating oil on casing wall, reduce the loss of lubricating oil.
Technical solution of the present invention additionally provides a kind of internal combustion engine, including cylinder body and setting in the intracorporal piston of cylinder, piston
For the novel steel pistons of internal combustion engine for any one that above-mentioned technical proposal proposes.
In the present solution, the novel steel pistons of the internal combustion engine for any one that internal combustion engine proposes by adopting the above technical scheme, therefore
Whole beneficial effects of the novel steel pistons of internal combustion engine of any one with above-mentioned technical proposal proposition, details are not described herein.
By above technical scheme, using formula pressure-bearing surface structure free of discontinuities etc. on the upside of piston pin hole, piston pin hole is improved
The bearing capacity on top, reduce that piston pin hole is glued, pulls and the generation of Cracking Failure phenomenon, and it is whole to improve piston
Reliability and service life are conducive to the reliability, economy and the durability that promote internal combustion engine complete machine.
Additional aspect and advantage of the invention will provide in following description section, will partially become from the following description
Obviously, or practice through the invention is recognized.
Detailed description of the invention
Above-mentioned and/or additional aspect of the invention and advantage will become from the description of the embodiment in conjunction with the following figures
Obviously and it is readily appreciated that, in which:
Fig. 1 shows the internal combustion engine according to an embodiment of the invention structural schematic diagram of novel steel pistons；
Fig. 2 shows the internal combustion engine according to an embodiment of the invention structural schematic diagrams of novel steel pistons；
Fig. 3 shows the internal combustion engine according to an embodiment of the invention schematic top plan view of novel steel pistons,
Wherein, corresponding relationship of the Fig. 1 into Fig. 3 between appended drawing reference and component are as follows:
10 piston crowns, 102 annular oil cavities, 104 circular cavities, 106 piston ring grooves, 108 combustion chambers, 20 piston skirts,
202 piston bosses, 204 piston pin holes, 206 first oilholes, 208 second oilholes, 210 fuel feed holes, 212 oil outlets.
Specific embodiment
To better understand the objects, features and advantages of the present invention, with reference to the accompanying drawing and specific real
Applying mode, the present invention is further described in detail.It should be noted that in the absence of conflict, the implementation of the application
Feature in example and embodiment can be combined with each other.
In the following description, numerous specific details are set forth in order to facilitate a full understanding of the present invention, still, the present invention may be used also
To be implemented using other than the one described here other modes, therefore, protection scope of the present invention is not by described below
Specific embodiment limitation.
It is specifically described below with reference to internal combustion engine of the Fig. 1 to Fig. 3 to embodiment according to the present invention with novel steel pistons.
As shown in Figure 1 to Figure 3, the novel steel pistons of the internal combustion engine of embodiment according to the present invention, including piston crown 10
With piston skirt 20, piston skirt 20 includes: the piston boss 202 and piston pin hole 204 being equipped with, piston pin hole 204
The central axis upright of central axis and the novel steel pistons of internal combustion engine is formula pressure-bearing surface knot free of discontinuities on the upside of piston pin hole 204
Structure.
In the present embodiment, hung down by the central axis of piston pin hole 204 and the central axis of the novel steel pistons of internal combustion engine
Directly, it is formula pressure-bearing surface structure free of discontinuities on the upside of piston pin hole 204, improves the bearing capacity on 204 top of piston pin hole, reduce
Piston pin hole 204 is glued, pulls and the generation of Cracking Failure phenomenon, improves the reliability and service life of piston entirety,
Be conducive to be promoted reliability, economy and the durability of internal combustion engine complete machine.
As shown in Figure 1 to Figure 3, there are the annular oil cavity 102 and circular cavity 104 being equipped in piston crown 10；Piston
The periphery on head 10 concaves to form piston ring groove 106；It concaves to form combustion chamber 108 among the top surface of piston crown 10.
In the present embodiment, by having in the annular oil cavity 102 being equipped with and the conduct of circular cavity 104 in piston crown 10
Effective cooling may be implemented in cold oil chamber, concaves to form piston ring groove 106 by the periphery of piston crown 10, favorably
In striking off the lubricating oil on casing wall, the loss of lubricating oil is reduced, concaves to form burning among the top surface by piston crown 10
Room 108 is advantageously implemented the active combustion of fuel, realizes the function of piston, and convenient processing and manufacture.
As shown in Figure 1 to Figure 3, piston skirt 20 further include: the first oilhole 206 runs through annular oil cavity 102 and circle is empty
Between chamber 104, the central axis upright of the first oilhole 206 is in the central axis of piston pin hole 204, the center of the first oilhole 206
The central axis of axis and the novel steel pistons of internal combustion engine is in angle；Second oilhole 208, runs through circular cavity 104 and piston
Between pin hole 204, the central axis of the second oilhole 208 and the centerline axis parallel of the novel steel pistons of internal combustion engine.
In the present embodiment, by running through the first oilhole 206 between annular oil cavity 102 and circular cavity 104, the first oil
The central axis upright in hole 206 is in the central axis of piston pin hole 204, and the central axis and internal combustion engine of the first oilhole 206 are with newly
The central axis of fashioned iron piston is in angle, has penetrated through annular oil cavity 102 and circular cavity 104, has been advantageously implemented a left side for lubricating oil
It is right to flow and teetertotter, it realizes effective cooling as inner-cooling oil recess, and occupy little space, improves crushing resistance
Can, by running through the second oilhole 208 between circular cavity 104 and piston pin hole 204, the central axis of the second oilhole 208
With the internal combustion engine centerline axis parallel of novel steel pistons, parts of lubricating oil importing piston pin hole 204 can be played certain
Lubricating action, is conducive to the cooperative movement between piston pin hole 204 and piston pin, and the entirety for further improving piston uses the longevity
Life.
As shown in Figure 1 to Figure 3, the first oilhole 206 is arranged two, and the central axis of two the first oilholes 206 is about internal combustion
Machine is symmetrical with the central axis of novel steel pistons.
In the present embodiment, it is arranged two by the first oilhole 206, the central axis of two the first oilholes 206 is about internal combustion
Machine is symmetrical with the central axis of novel steel pistons, is further conducive to cooling and moderate lubrication oil enters piston pin hole 204
Lubrication, and occupy little space, improve compressive property.
As shown in Figure 1 to Figure 3, piston skirt 20 further include: fuel feed hole 210 and oil outlet 212 are respectively arranged on piston pin hole
204 two sides, fuel feed hole 210, oil outlet 212 are penetrated through with the annular oil cavity of corresponding side 102 respectively.
In the present embodiment, by being respectively arranged on the fuel feed hole 210 and oil outlet 212 of the two sides of piston pin hole 204, fuel feed hole
210, oil outlet 212 is penetrated through with the annular oil cavity of corresponding side 102 respectively, is realized the oil inlet of the novel steel pistons of internal combustion engine and is gone out
Oil has ensured effective operation of inner-cooling oil recess, cooling while promoting piston whole compressive strength.
Internal combustion engine is integral type steel pistons with novel steel pistons.
In the present embodiment, with novel steel pistons it is integral type steel pistons by internal combustion engine, further improves compressive property,
Further improve the reliability and service life of piston entirety, be conducive to be promoted the reliability of internal combustion engine complete machine, economy and
Durability.
Piston crown 10 and piston skirt 20 are alloy steel piece, friction welding (FW) between piston crown 10 and piston skirt 20
It connects.
It is alloy steel piece by piston crown 10 and piston skirt 20 in the present embodiment, so that the intensity of piston entirety
Height, thermal expansion is small, by friction welding between piston crown 10 and piston skirt 20, compressive property is further improved, into one
Step improves the reliability and service life of piston entirety, is conducive to the promotion reliability of internal combustion engine complete machine, economy and durable
Property.
Piston ring groove 106 include twice compression oil ring groove with together with, be followed successively by by top under compression, compression,
Oil ring groove.
In the present embodiment, includes twice compression oil ring groove with together with by piston ring groove 106, be followed successively by by top under
Compression, compression, oil ring groove are conducive to strike off the lubricating oil on casing wall, reduce the loss of lubricating oil.
The internal combustion engine of embodiment according to the present invention, including cylinder body and setting, in the intracorporal piston of cylinder, piston is above-mentioned
The novel steel pistons of internal combustion engine that one embodiment proposes.
In the present embodiment, the novel steel pistons of internal combustion engine for any one that internal combustion engine is proposed using above-described embodiment, therefore
Whole beneficial effects of the novel steel pistons of internal combustion engine of any one with above-described embodiment proposition, details are not described herein.
The technical scheme of the present invention has been explained in detail above with reference to the attached drawings, and the invention proposes a kind of internal combustion engine Novel steels
Piston and a kind of internal combustion engine, by, using formula pressure-bearing surface structure free of discontinuities etc., improving piston pin hole top on the upside of piston pin hole
Bearing capacity, reduce that piston pin hole is glued, pulls and the generation of Cracking Failure phenomenon, improve whole reliable of piston
Property and service life, be conducive to promoted internal combustion engine complete machine reliability, economy and durability.
In the present invention, term " first ", " second ", " third " are only used for the purpose of description, and should not be understood as indicating
Or imply relative importance；Term " multiple " then refers to two or more, unless otherwise restricted clearly.Term " installation ",
The terms such as " connected ", " connection ", " fixation " shall be understood in a broad sense, for example, " connection " may be a fixed connection, being also possible to can
Dismantling connection, or be integrally connected；" connected " can be directly connected, can also be indirectly connected through an intermediary.For this
For the those of ordinary skill in field, the specific meanings of the above terms in the present invention can be understood according to specific conditions.
In description of the invention, it is to be understood that the instructions such as term " on ", "lower", "left", "right", "front", "rear"
Orientation or positional relationship is to be based on the orientation or positional relationship shown in the drawings, and is merely for convenience of the description present invention and simplification is retouched
It states, rather than the device or unit of indication or suggestion meaning must have specific direction, be constructed and operated in a specific orientation,
It is thus impossible to be interpreted as limitation of the present invention.
In the description of this specification, the description of term " one embodiment ", " some embodiments ", " specific embodiment " etc.
Mean that particular features, structures, materials, or characteristics described in conjunction with this embodiment or example are contained at least one reality of the invention
It applies in example or example.In the present specification, schematic expression of the above terms are not necessarily referring to identical embodiment or reality
Example.Moreover, description particular features, structures, materials, or characteristics can in any one or more of the embodiments or examples with
Suitable mode combines.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (9)
1. a kind of novel steel pistons of internal combustion engine, including piston crown and piston skirt, which is characterized in that the piston skirt packet
It includes:
The piston boss and piston pin hole being equipped with, the central axis of the piston pin hole and the internal combustion engine are living with Novel steel
The central axis upright of plug, the piston pin hole upside is formula pressure-bearing surface structure free of discontinuities.
2. the novel steel pistons of internal combustion engine according to claim 1, which is characterized in that
There are the annular oil cavity and circular cavity being equipped in the piston crown；
The periphery of the piston crown concaves to form piston ring groove；
It concaves to form combustion chamber among the top surface of the piston crown.
3. the novel steel pistons of internal combustion engine according to claim 2, which is characterized in that the piston skirt further include:
First oilhole is run through between the annular oil cavity and the circular cavity, the central axis upright of first oilhole
In the central axis of the piston pin hole, the central axis of first oilhole and the center of the novel steel pistons of the internal combustion engine
Axis is in angle；
Second oilhole is run through between the circular cavity and the piston pin hole, the central axis of second oilhole and institute
State the internal combustion engine centerline axis parallel of novel steel pistons.
4. the novel steel pistons of internal combustion engine according to claim 3, which is characterized in that
First oilhole is arranged two, and the central axis of two first oilholes is about the novel steel pistons of the internal combustion engine
Central axis it is symmetrical.
5. the novel steel pistons of internal combustion engine according to claim 4, which is characterized in that the piston skirt further include:
Fuel feed hole and oil outlet, are respectively arranged on the two sides of the piston pin hole, and the fuel feed hole, the oil outlet are respectively and accordingly
The annular oil cavity of side penetrates through.
6. the novel steel pistons of internal combustion engine according to claim 5, which is characterized in that
The internal combustion engine is integral type steel pistons with novel steel pistons.
7. the novel steel pistons of internal combustion engine according to claim 6, which is characterized in that
The piston crown and the piston skirt are alloy steel piece, are rubbed between the piston crown and the piston skirt
Welding.
8. the novel steel pistons of internal combustion engine according to claim 7, which is characterized in that
The piston ring groove includes twice compression oil ring groove with together with, and compression, compression, oil ring are followed successively by under by top
Slot.
9. a kind of internal combustion engine, including cylinder body and setting are in the intracorporal piston of the cylinder, which is characterized in that the piston is such as right
It is required that the novel steel pistons of internal combustion engine described in any one of 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811301315.4A CN109236486A (en) | 2018-11-02 | 2018-11-02 | Internal combustion engine novel steel pistons and internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811301315.4A CN109236486A (en) | 2018-11-02 | 2018-11-02 | Internal combustion engine novel steel pistons and internal combustion engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109236486A true CN109236486A (en) | 2019-01-18 |
Family
ID=65080410
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811301315.4A Pending CN109236486A (en) | 2018-11-02 | 2018-11-02 | Internal combustion engine novel steel pistons and internal combustion engine |
Country Status (1)
| Country | Link |
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| CN (1) | CN109236486A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114810327A (en) * | 2022-05-20 | 2022-07-29 | 潍柴动力股份有限公司 | Combustion chamber and gas engine |
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| US20160186686A1 (en) * | 2014-12-30 | 2016-06-30 | Federal-Mogul Corporation | Reduced compression height dual gallery piston, piston assembly therewith and methods of construction thereof |
| CN207960788U (en) * | 2018-02-28 | 2018-10-12 | 强莉莉 | A kind of piston |
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| CN103032196A (en) * | 2012-12-21 | 2013-04-10 | 中国兵器工业集团第七0研究所 | Combined piston with built-in piston pin |
| CN204163872U (en) * | 2014-08-28 | 2015-02-18 | 河南柴油机重工有限责任公司 | A kind of porous oil pocket all-steel piston |
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Application publication date: 20190118 |
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