CN110469421A - A kind of built-up piston - Google Patents
A kind of built-up piston Download PDFInfo
- Publication number
- CN110469421A CN110469421A CN201810448533.4A CN201810448533A CN110469421A CN 110469421 A CN110469421 A CN 110469421A CN 201810448533 A CN201810448533 A CN 201810448533A CN 110469421 A CN110469421 A CN 110469421A
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- CN
- China
- Prior art keywords
- piston
- built
- annular
- connecting hole
- lower portion
- 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
-
- 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
-
- 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
- F02F3/16—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 discloses a kind of built-up pistons, including upper piston area, piston lower portion and connector, oil cooling passage in annular is offered on upper piston area, the bottom of oil cooling passage is equipped at least one connecting hole being centrosymmetric for ring heart in annular, and piston lower portion cooperates with upper piston area to be compressed and be fastenedly connected by connector and connecting hole.The present invention has the advantages that low manufacturing cost, easy to form, reliability and bonding strength height, energy loss of weight.
Description
Technical field
The invention mainly relates to technical field of internal combustion engines more particularly to a kind of built-up pistons.
Background technique
The discharge upgrading of internal combustion engine is the lasting requirement to ic engine industry, and piston is the key that push discharge upgrading zero
One of component, it is the important means for meeting emission request that steel construction piston, which substitutes constructed of aluminium piston, and all steel overall structure piston is adopted
With solid forging or casting and forming or seperated forging base welding fabrication, all steel overall structure piston weight is big, moulding process is difficult
Degree is big, is unfavorable for reducing the exercise load of piston connecting rod unit, to reduce moulding process difficulty and piston weight, the steel of the prior art
Top and aluminum skirt composite structure reduces piston weight while meeting head heat burden requirement, to solve the above problem very
Good solution, such as: CN201510040273.3 forms steel pistons and its processing side of interior cooling oil chamber based on laser welding
Method preferably resolves the formation problems of cooling oil chamber in piston；The bis- cooling oil chamber welded types of CN201220646167.1 are whole
Forged steel internal combustion engine is provided by a kind of double oil recess structure pistons of full steel structure friction welding；CN200820159361.0
A kind of built-up piston structure effectively reduces piston weight while meeting internal combustion engine high detonation pressure, the piston connecting rod unit of mitigation
Operating load；The improvement of 280/285 series cab use for diesel engine steel crown and aluminum skirt piston of CN02274796.6, provides by multiple
Bolted built-up piston.
Bolted fabricated structure piston is to reduce upper piston area thermic load and piston weight, provides good think of
Road and method, but there is following problems for the technical solution: first is that upper piston area steel structure support and interconnecting piece volume are thick and heavy, again
Amount is big, increases exercise load；Second is that the annular cooling oil duct of upper piston area is open architecture, hold in impulse stroke piston ring groove
Easy stress deformation, the abrasion for increasing annular groove；Third is that connector bears high temperature and pressure load repeatedly, bolt is also easy to produce stress relaxation
And Joint failure；Fourth is that the head that interior outer oil cavity connectivity structure is unfavorable for v-shaped structure engine piston is cooling, cooling effect is reduced
Fruit.
Summary of the invention
The technical problem to be solved by the present invention is to overcome the deficiencies in the prior art, provide a kind of manufacturing cost it is low, it is easy to form, can
High by property and bonding strength, energy loss of weight built-up piston.
In order to solve the above technical problems, the invention adopts the following technical scheme:
A kind of built-up piston, including upper piston area, piston lower portion and connector offer on the upper piston area cold in annular
Oil duct, it is described annular in oil cooling passage bottom be equipped at least one connecting hole being centrosymmetric for ring heart, the piston lower portion
Cooperate with upper piston area and compresses and be fastenedly connected by connector and connecting hole.
As a further improvement of the above technical scheme:
Oil cooling passage bottom is equipped with annular opening in the annular, and the annular opening is connected with an endless belt, the connecting hole
It is provided on endless belt.
The bottom of the upper piston area is equipped with recess portion, and upper piston area is set as annular groove wall on the outside of the recess portion, in the annular
Oil cooling passage is provided on recess portion and close to annular groove wall, and the top of the piston lower portion is equipped with the protrusion with recesses fit, described convex
The top surface in portion compresses the top surface of recess portion, and the lateral wall of protrusion is adjacent to the inner sidewall of annular groove wall.
The recess portion is equipped with upper half oil pocket of center in middle position, and the protrusion is equipped with lower half oil pocket of center in middle position,
Center oil pocket is collectively formed in half oil pocket of upper center and lower half oil pocket of center.
The protrusion offers weight loss groove in the position of the oil cooling passage in annular.
The piston lower portion is equipped with pin hole, and each axisymmetrical to the connecting hole relative to pin hole is arranged.
The endless belt is equipped with the connected unit to top bump, and the connecting hole is through the connected unit and is set as screw thread
Hole.
It is also provided with loss of weight deep gouge on the endless belt, is spaced apart on the loss of weight deep gouge and subtracts equipped with what is communicated with weight loss groove
Repeated hole.
The connector includes screw rod and countersunk head nut, and the screw rod is arranged in piston lower portion, screw rod one end and connecting hole
Threaded connection, the other end and countersunk head nut screw threads for fastening.
Compared with the prior art, the advantages of the present invention are as follows:
Built-up piston of the invention, including upper piston area, piston lower portion and connector offer on upper piston area cold in annular
Oil duct, the bottom opening of oil cooling passage is connected with an endless belt in annular, and it is in center for ring heart that endless belt, which is equipped at least one,
Symmetrical connecting hole, piston lower portion cooperates with upper piston area to be compressed and is fastenedly connected by connector and connecting hole.In the structure,
Upper piston area and piston lower portion are fastened together by endless belt and connector, oil cooling passage two sidewalls in endless belt and annular
Welding, for traditional circular weld, the present invention is by connector, so that upper piston area and piston lower portion form combination
Formula assembly connection, friction overlap will not be generated by not needing friction welding (FW), i.e., there is no the oxide skin particles on overlap surface in piston
It is brought into lubricating oil after oscillatory surge repeatedly in motion process, improves the use reliability of diesel engine；Unique section
Position and section structure are conducive to process and assemble positioning, improve processing efficiency so that its structure is simple；Upper piston area and work
The link position of plug lower part in oil cooling passage, can reduce upper piston area support portion thickness in annular, be conducive to mitigate upper piston area weight
Amount；Endless belt and connector in oil cooling passage, avoid high warm load in annular, reduce connector stress relaxation, benefit
In reduction connector Joint failure.
Detailed description of the invention
Fig. 1 is the schematic perspective view of built-up piston embodiment 1 of the present invention.
Fig. 2 is the schematic diagram of the section structure of built-up piston embodiment 1 of the present invention.
Fig. 3 is the broken section structural schematic diagram of built-up piston embodiment 1 of the present invention.
Fig. 4 is the overlooking structure diagram of built-up piston embodiment 1 of the present invention.
Fig. 5 is the schematic perspective view of upper piston area in built-up piston embodiment 1 of the present invention.
Fig. 6 is the main cross section structure diagram of upper piston area in built-up piston embodiment 1 of the present invention.
Fig. 7 is the schematic perspective view of piston lower portion in built-up piston embodiment 1 of the present invention.
Fig. 8 is the schematic diagram of the section structure of piston lower portion in built-up piston embodiment 1 of the present invention.
Fig. 9 is the schematic perspective view of endless belt in built-up piston embodiment 1 of the present invention.
Figure 10 is the schematic perspective view of built-up piston embodiment 2 of the present invention.
Figure 11 is the schematic diagram of the section structure of steel pistons embodiment 2 of the present invention.
Figure 12 is the overlooking structure diagram of steel pistons embodiment 2 of the present invention.
Each label indicates in figure:
1, upper piston area；11, oil cooling passage in annular；12, recess portion；121, upper half oil pocket of center；13, annular groove wall；2, piston lower portion；
21, protrusion；211, lower half oil pocket of center；212, weight loss groove；22, pin hole；3, connector；31, screw rod；32, countersunk head nut；4, ring
Shape band；41, connecting hole；42, connected unit；43, loss of weight deep gouge；44, lightening hole；5, center oil pocket.
Specific embodiment
The present invention is described in further details below with reference to Figure of description and specific embodiment.
Embodiment 1:
Fig. 1 to Fig. 9 shows the first embodiment of built-up piston of the present invention, including upper piston area 1, piston lower portion 2 and company
Fitting 3 offers oil cooling passage 11 in annular on upper piston area 1, and the bottom of oil cooling passage 11 is equipped at least one for ring heart in annular
The connecting hole 41 being centrosymmetric, piston lower portion 2 and the cooperation of upper piston area 1 are compressed and are fastened by connector 3 and connecting hole 41
Connection.In the structure, upper piston area 1 and piston lower portion 2 are fastened together by connector 3, compared to traditional annular
For weld seam, the present invention is not needed by connector 3 so that upper piston area 1 and piston lower portion 2 form combined type assembly connection
Friction welding (FW) will not generate friction overlap, i.e., there is no the oxide skin particles on overlap surface to be shaken repeatedly during piston motion
It is brought into lubricating oil after swinging impact, improves the use reliability of diesel engine；Unique cross section place and section structure, so that
Its structure is simple, is conducive to process and assemble positioning, improves processing efficiency；The link position of upper piston area 1 and piston lower portion 2 exists
In annular in oil cooling passage 11,1 support portion thickness of upper piston area can be reduced, is conducive to mitigate 1 weight of upper piston area；Connector 3 exists
In annular in oil cooling passage 11, high warm load is avoided, reduces 3 stress relaxation of connector, being conducive to, which reduces the connection of connector 3, loses
Effect.
In the present embodiment, 11 bottom of oil cooling passage is equipped with annular opening in annular, and annular opening is connected with an endless belt 4,
Connecting hole 41 is provided on endless belt 4.In the structure, upper piston area 1 and piston lower portion 2 are fastened by endless belt 4 and connector 3
It links together, 11 two sidewalls of oil cooling passage are welded in endless belt 4 and annular, endless belt 4 and connector 3 oil cooling passage in annular
In 11, high warm load is avoided, reduces 3 stress relaxation of connector, is conducive to reduce by 3 Joint failure of connector.
In the present embodiment, the bottom of upper piston area 1 is equipped with recess portion 12, and upper piston area 1 is set as annular groove on the outside of recess portion 12
Wall 13, oil cooling passage 11 is provided on recess portion 12 and close to annular groove wall 13 in annular, and the top of piston lower portion 2 is equipped with matches with recess portion 12
The protrusion 21 of conjunction, the top surface of protrusion 21 compress the top surface of recess portion 12, and the lateral wall of protrusion 21 is adjacent to the inner sidewall of annular groove wall 13.It should
In structure, by the cooperation of protrusion 21 and recess portion 12 and the setting of endless belt 4, so that oil cooling passage 11 forms closing in annular
Oil duct, and protrusion 21 and endless belt 4 improve the intensity of annular groove wall 13 to the lateral support of annular groove wall 13, are conducive to eliminate annular groove
Deformation, reduce annular groove inordinate wear.
In the present embodiment, recess portion 12 is equipped with upper half oil pocket 121 of center in middle position, and protrusion 21 is equipped in lower in middle position
Center oil pocket 5 is collectively formed in half oil pocket 211 of the heart, upper half oil pocket 121 of center and half oil pocket 211 of lower center.Especially tilting of the piston
It arranges under working condition, lubricating oil a part enters oil cooling passage 11 in annular, and another part enters center oil pocket 5, respectively to work
Portion 1 carries out oscillation cooling beyond the Great Wall, guarantees the cooling effect of upper piston area 1.
In the present embodiment, protrusion 21 offers weight loss groove 212 in the position of the oil cooling passage 11 in annular.The weight loss groove
212 can further reduced overall weight to 2 loss of weight of piston lower portion.
In the present embodiment, piston lower portion 2 is equipped with pin hole 22, axisymmetrical cloth of each pair of connecting hole 41 relative to pin hole 22
It sets.In this way, ensure that each pair of connecting hole 41 is distributed in 22 side of pin hole, the installation position of connector 3 is on the one hand ensured
It sets, on the other hand ensures that the stress of connection position is horizontal.
In the present embodiment, endless belt 4 is equipped with the connected unit 42 to top bump, and connecting hole 41 is through connected unit 42 and is arranged
For threaded hole.On the one hand the setting of the connected unit 42 ensure that the threaded engagement depth with connector 3, improve bonding strength,
On the other hand to form segmented oil duct in oil cooling passage 11 in annular, be conducive to engine tilts state or inclination arrangement
The equilibrium of working condition lower piston annulus is cooling.
In the present embodiment, it is also provided with loss of weight deep gouge 43 on endless belt 4, is spaced apart and is equipped with and weight loss groove on loss of weight deep gouge 43
212 lightening holes 44 communicated.The loss of weight deep gouge 43 and lightening hole 44 reduce the weight of endless belt 4, are conducive to further realize
Weight loss effect.
In the present embodiment, connector 3 includes screw rod 31 and countersunk head nut 32, and screw rod 31 is arranged in piston lower portion 2, screw rod 31
One end is threadedly coupled with connecting hole 41,32 screw threads for fastening of the other end and countersunk head nut.In the structure, screw rod 31 passes through piston lower portion
2 are threadedly coupled with connecting hole 41, and countersunk head nut 32 is by other end connecting screw 31, and when tightening, countersunk head nut 32 is driven under piston
2 clamping piston top 1 of portion, also settable gasket between countersunk head nut 32 and screw rod 31, to further increase fit sealing effect.
In the present embodiment, connected unit 42 is provided with two pairs, i.e. four screw rod, 31 connection structure, the work slightly larger suitable for volume
Plug.
Embodiment 2:
Figure 10 to Figure 12 shows second of embodiment of built-up piston of the present invention, and the piston is substantially the same manner as Example 1, area
Be not only that: in the present embodiment, connected unit 42 is provided with a pair, i.e. two screw rod, 31 connection structure, the work suitable for small volume
Plug.
Although the present invention is disclosed as above with preferred embodiment, however, it is not intended to limit the invention.It is any to be familiar with ability
The technical staff in domain, without deviating from the scope of the technical scheme of the present invention, all using the technology contents pair of the disclosure above
Technical solution of the present invention makes many possible changes and modifications or equivalent example modified to equivalent change.Therefore, all
Without departing from the content of technical solution of the present invention, according to the present invention technical spirit any simple modification made to the above embodiment,
Equivalent variations and modification, all shall fall within the protection scope of the technical scheme of the invention.
Claims (10)
1. a kind of built-up piston, it is characterised in that: including upper piston area (1), piston lower portion (2) and connector (3), the work
It is offered oil cooling passage in annular (11) on portion (1) beyond the Great Wall, the bottom of oil cooling passage (11) is equipped at least one for ring in the annular
The connecting hole (41) that the heart is centrosymmetric, the piston lower portion (2) and upper piston area (1) cooperation compress and pass through connector (3)
It is fastenedly connected with connecting hole (41).
2. built-up piston according to claim 1, it is characterised in that: oil cooling passage (11) bottom is equipped with ring in the annular
Shape opening, the annular opening are connected with an endless belt (4), and the connecting hole (41) is provided on endless belt (4).
3. built-up piston according to claim 2, it is characterised in that: the bottom of the upper piston area (1) is equipped with recess portion
(12), upper piston area (1) is set as annular groove wall (13) on the outside of recess portion (12), and oil cooling passage (11) is provided with recess portion in the annular
(12) on and close to annular groove wall (13), the top of the piston lower portion (2) is equipped with the protrusion (21) cooperated with recess portion (12), described
The top surface of protrusion (21) compresses the top surface of recess portion (12), and the lateral wall of protrusion (21) is adjacent to the inner sidewall of annular groove wall (13).
4. built-up piston according to claim 3, it is characterised in that: the recess portion (12) is equipped in upper in middle position
Half oil pocket of the heart (121), the protrusion (21) are equipped with lower half oil pocket of center (211), upper half oil pocket of center (121) in middle position
Center oil pocket (5) are collectively formed with lower half oil pocket of center (211).
5. built-up piston according to claim 4, it is characterised in that: the protrusion (21) is in the oil cooling passage in annular
(11) position offers weight loss groove (212).
6. built-up piston according to claim 5, it is characterised in that: the piston lower portion (2) is equipped with pin hole (22),
Each axisymmetrical to the connecting hole (41) relative to pin hole (22) is arranged.
7. built-up piston according to claim 5 or 6, it is characterised in that: the endless belt (4) is equipped with to top bump
Connected unit (42), the connecting hole (41) is through the connected unit (42) and being set as threaded hole.
8. built-up piston according to claim 7, it is characterised in that: it is heavy to be also provided with loss of weight on the endless belt (4)
Slot (43) is spaced apart the lightening hole (44) for being equipped with and communicating with weight loss groove (212) on the loss of weight deep gouge (43).
9. built-up piston according to any one of claim 1 to 6, it is characterised in that: the connector (3) includes spiral shell
Bar (31) and countersunk head nut (32), the screw rod (31) are arranged in piston lower portion (2), screw rod (31) one end and connecting hole (41) spiral shell
Line connection, the other end and countersunk head nut (32) screw threads for fastening.
10. built-up piston according to claim 8, it is characterised in that: the connector (3) includes screw rod (31) and sinks
Head nut (32), the screw rod (31) are arranged in piston lower portion (2), and screw rod (31) one end is threadedly coupled with connecting hole (41), is another
One end and countersunk head nut (32) screw threads for fastening.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810448533.4A CN110469421A (en) | 2018-05-11 | 2018-05-11 | A kind of built-up piston |
| PCT/CN2019/086196 WO2019214678A1 (en) | 2018-05-11 | 2019-05-09 | Combined piston |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810448533.4A CN110469421A (en) | 2018-05-11 | 2018-05-11 | A kind of built-up piston |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110469421A true CN110469421A (en) | 2019-11-19 |
Family
ID=68467813
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810448533.4A Pending CN110469421A (en) | 2018-05-11 | 2018-05-11 | A kind of built-up piston |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN110469421A (en) |
| WO (1) | WO2019214678A1 (en) |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2357569A1 (en) * | 1973-11-17 | 1975-05-22 | Motoren Turbinen Union | PISTON FOR RECEPTACLE COMBUSTION MACHINE |
| US6223710B1 (en) * | 1996-10-12 | 2001-05-01 | Mahle Gmbh | Built-up piston |
| CN101189424A (en) * | 2004-11-30 | 2008-05-28 | 马勒国际公司 | Two-part piston for a combustion engine |
| CN201326734Y (en) * | 2008-11-18 | 2009-10-14 | 湖南江滨机器（集团）有限责任公司 | Composite piston |
| CN201723321U (en) * | 2007-10-20 | 2011-01-26 | 马勒国际公司 | Pistons for internal combustion engine |
| CN202914197U (en) * | 2012-09-27 | 2013-05-01 | 常州南车柴油机零部件有限公司 | Combined steel-top aluminum-skirt piston |
| US20140331958A1 (en) * | 2011-03-04 | 2014-11-13 | Mahle International Gmbh | Piston for an internal combustion engine and method for its production |
| DE102015217614B3 (en) * | 2015-09-15 | 2017-02-02 | Federal-Mogul Nürnberg GmbH | Piston for an internal combustion engine and method for producing a piston for an internal combustion engine |
| CN107524542A (en) * | 2017-09-04 | 2017-12-29 | 常州中车柴油机零部件有限公司 | A kind of diesel engine composite piston |
| CN107630764A (en) * | 2017-08-10 | 2018-01-26 | 中国北方发动机研究所(天津) | A kind of NEW TYPE OF COMPOSITE heat insulation structural piston |
| CN109519298A (en) * | 2017-09-19 | 2019-03-26 | 强莉莉 | A kind of built-up piston |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19926568A1 (en) * | 1999-06-11 | 2000-12-14 | Mahle Gmbh | Cooled pistons for internal combustion engines |
-
2018
- 2018-05-11 CN CN201810448533.4A patent/CN110469421A/en active Pending
-
2019
- 2019-05-09 WO PCT/CN2019/086196 patent/WO2019214678A1/en active Application Filing
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2357569A1 (en) * | 1973-11-17 | 1975-05-22 | Motoren Turbinen Union | PISTON FOR RECEPTACLE COMBUSTION MACHINE |
| US6223710B1 (en) * | 1996-10-12 | 2001-05-01 | Mahle Gmbh | Built-up piston |
| CN101189424A (en) * | 2004-11-30 | 2008-05-28 | 马勒国际公司 | Two-part piston for a combustion engine |
| CN201723321U (en) * | 2007-10-20 | 2011-01-26 | 马勒国际公司 | Pistons for internal combustion engine |
| CN201326734Y (en) * | 2008-11-18 | 2009-10-14 | 湖南江滨机器（集团）有限责任公司 | Composite piston |
| US20140331958A1 (en) * | 2011-03-04 | 2014-11-13 | Mahle International Gmbh | Piston for an internal combustion engine and method for its production |
| CN202914197U (en) * | 2012-09-27 | 2013-05-01 | 常州南车柴油机零部件有限公司 | Combined steel-top aluminum-skirt piston |
| DE102015217614B3 (en) * | 2015-09-15 | 2017-02-02 | Federal-Mogul Nürnberg GmbH | Piston for an internal combustion engine and method for producing a piston for an internal combustion engine |
| CN107630764A (en) * | 2017-08-10 | 2018-01-26 | 中国北方发动机研究所(天津) | A kind of NEW TYPE OF COMPOSITE heat insulation structural piston |
| CN107524542A (en) * | 2017-09-04 | 2017-12-29 | 常州中车柴油机零部件有限公司 | A kind of diesel engine composite piston |
| CN109519298A (en) * | 2017-09-19 | 2019-03-26 | 强莉莉 | A kind of built-up piston |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2019214678A1 (en) | 2019-11-14 |
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