CN201187358Y - Forged steel integrated piston made by laser welding with closed internal cooling oil cavity - Google Patents
Forged steel integrated piston made by laser welding with closed internal cooling oil cavity Download PDFInfo
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- CN201187358Y CN201187358Y CNU2008200219377U CN200820021937U CN201187358Y CN 201187358 Y CN201187358 Y CN 201187358Y CN U2008200219377 U CNU2008200219377 U CN U2008200219377U CN 200820021937 U CN200820021937 U CN 200820021937U CN 201187358 Y CN201187358 Y CN 201187358Y
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- forged steel
- laser welding
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Abstract
The utility model discloses a laser-welding forged steel integrated piston with a closed internal cold oil chamber, which solves the problems that the prior aluminum piston can not meet the requirements for high power, high strength and low emission of the engine and has the advantages of simple structure, easy fabrication and capability of meeting the requirements for high power, high strength and low emission of the engine. The laser-welding forged steel integrated piston comprises a piston body and a piston ring, wherein the piston body is integrated with the piston ring by the laser welding process, an internal cold oil chamber is arranged therebetween and communicates with the inner cavity of the piston via at least two oil inlet/outlet holes, and a pin hole is formed at the lower part of the piston body.
Description
Technical field:
The utility model relates to a kind of piston, relates in particular to a kind of laser welding forged steel integral piston with closed inner-cooling oil recess.
Technical background:
Being used for truck, engineering machinery, railway locomotive and marine engine is at present all developing to high-power, high load direction, reinforcing degree improves constantly, emission request is more and more stricter, though primary aluminum matter piston has lightweight advantage, aluminium material can not satisfy the requirement of motor high power, high reinforcement, low emission gradually.
At diesel engine piston high-power, high load, hinged pendulum mass formula structure piston is arranged at present, promptly piston head and piston skirt separate machined are made, and couple together by wrist pin, and piston head adopts cast iron or forged steel material, and piston skirt adopts the aluminium material manufacturing.This piston has increased processing cost, and has been difficult to form the cooling oil pocket of sealing because piston head separates manufacturing with piston skirt, and the piston cooling effect is poor, because need longer wrist pin to connect, overall weight also increases to some extent simultaneously.
Chinese patent CN 1610601A discloses a kind of method of making the forged steel piston, and this method is that the piston blank integral type is forged, and with a ring cowling of processing in addition, with the annular groove assembling that piston crown processes, goes into oil closed cavity.But its complex manufacturing technology, the manufacture cost height, structure of piston intensity has much room for improvement.
Chinese patent CN2851607Y discloses the method for another kind of manufacturing forged steel piston, this method is that forge respectively in head and skirt section, inner-cooling oil recess is to process the back respectively to form by friction welding in head and skirt section, friction welding is accepted its technology mode and device structure performance, precision is limit, conformity with series-produced its length dimension of friction welding piston is relatively poor, the inner-cooling oil recess size that causes piston weight and welding back to be produced differs greatly, thereby make the welding reject rate very high, directly influence engine performance, and welding overlap big (generally at 4-8mm), need carry out special processing to its welding overlap that is exposed, but the welding overlap of inner-cooling oil recess the inside can't be removed, and can have influence on the piston cooling effect.
The model utility content
The purpose of this utility model is exactly in order to solve the problem that present aluminum piston can not satisfy the requirement of motor high power, high reinforcement, low emission, provide a kind of have simple in structure, preparation process is easy relatively, can satisfy the motor high power, high strengthens, the laser welding forged steel integral piston of the band closed inner-cooling oil recess of the advantages such as requirement of low emission.
For achieving the above object, the utility model adopts following technological scheme:
A kind of laser welding forged steel integral piston with closed inner-cooling oil recess, it comprises piston only and piston ring body, by its welding of laser it is become one, cooling oil pocket in forming between the two after the welding, the cooling oil pocket is communicated with piston cavity by at least two turnover oilholes, but oil-feed and fuel-displaced, when piston is worked in motor, machine oil sprays into from oil inlet hole, and flows in annular cooling chamber, flows out from oil outlet, take away the heat of piston, to reduce the operating temperature at each position of piston, guarantee the functional reliability of piston and piston ring, the piston only bottom is a pin-and-hole; Owing to, piston overall structure rigidity is increased by welding formation sealing cooling oil pocket, make that particularly the distortion under work is hot of annular groove position is little at the pistons work position, can improve sealability, reduce engine emission.
On the described piston ring body at least one annular groove is arranged.
The skirt section design of described piston only has circular groove.
Laser welding zone between described piston only and piston ring body is cylindrical and two annular regions of end face, and position while welding can be adjusted according to the piston structure difference.
The utility model processes circular groove above the piston skirt, not only alleviated weight, and helps the machine oil oil return of oil ring groove position, has increased the skirt section flexibility simultaneously, help cylinder prepareding gap reduce reduce with engine oil consumption.
In piston pin hole direction both sides, forge and recessedly partially satisfying under the piston requirement of strength prerequisite, alleviated the weight of whole piston.Dodge the oil nozzle of installing on the engine body as need,, can design a breach in the lower end, piston skirt, when preventing that piston motion from arriving lower dead center and oil nozzle interfere.
The utility model is different from CN 1610601A patent part, forge respectively in head and skirt section, inner-cooling oil recess is to process the back respectively by laser bonding formation at head and skirt section, makes the forging of piston blank, the formation reduction of process of oil closed cavity, and structure of piston intensity is higher.And the forged steel piston of CN 1610601A patent disclosure is not a welded structure, but package assembly, its maximum shortcoming is the piston poor rigidity, the manufacturing process complexity.
The forged steel piston welding procedure of CN2851607Y patent disclosure is friction welding.But laser bonding is compared with friction welding, have remarkable advantages, the laser bonding size is very accurate, and piston structure of the present utility model can not change in welding back piston length, the forging of piston blank, the processing technology of oil closed cavity are simplified, and structure of piston intensity is higher.Do not have the welding overlap, piston does not have distortion, saves piston material, can make each workpiece inner-cooling oil recess size (the cooling oil pocket has better cooling effect) unanimity, piston weight is identical, can therefore not produce waste product, be fit to very much produce in batches, this is that friction welding is incomparable.
The beneficial effects of the utility model are: can replace aluminum piston and hinging structure piston, friction welding type piston with forged steel structure, have the intensity of lighter weight and Geng Gao to satisfy the reinforcement and the emission request of motor again, also have good anufacturability.
Description of drawings
Fig. 1 is a structural representation of the present utility model.
Wherein, 1. piston ring body, 2. piston only, 3. inner-cooling oil recess, 4. laser welding zone, 5. pin-and-hole, 6. skirt section, 7. circular groove, 8. annular groove.
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing and embodiment.
Embodiment 1:
Among Fig. 1, piston only 2 is the parts that forge respectively with piston ring body 1, and both by laser bonding together.One or multi-channel annular groove 8 is arranged on the piston ring body 1, and the laser welding zone 4 of it and piston only 2 is two annular regions up and down, and it forms inner-cooling oil recess 3 with 2 of piston onlies, and this inner-cooling oil recess 3 passes in and out oilholes by two or three and is communicated with piston cavity.On the skirt section 6 of piston only 2 circular groove 7 is arranged, in the bottom of piston only 2 pin-and-hole 5 is arranged, the both sides of pin-and-hole 5 forge recessed inclined to one side.
Claims (4)
1, a kind of laser welding forged steel integral piston with closed inner-cooling oil recess, it comprises piston only (2) and piston ring body (1), it is characterized in that, described piston only (2) becomes one by laser bonding and piston ring body (1), be interior cooling oil pocket (3) between the two, cooling oil pocket (3) is communicated with piston cavity by at least two turnover oilholes; Pin-and-hole (5) is arranged at piston only (2) bottom.
2, the laser welding forged steel integral piston of band closed inner-cooling oil recess as claimed in claim 1 is characterized in that, is processed with at least one annular groove (8) on the described piston ring body (1).
3, the laser welding forged steel integral piston of band closed inner-cooling oil recess as claimed in claim 1 is characterized in that, the skirt section (6) of described piston only (2) is provided with circular groove (7).
4, the laser welding forged steel integral piston of band closed inner-cooling oil recess as claimed in claim 1 is characterized in that, the laser welding zone (4) between described piston only (2) and piston ring body (1) is two annular regions up and down.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200219377U CN201187358Y (en) | 2008-05-08 | 2008-05-08 | Forged steel integrated piston made by laser welding with closed internal cooling oil cavity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200219377U CN201187358Y (en) | 2008-05-08 | 2008-05-08 | Forged steel integrated piston made by laser welding with closed internal cooling oil cavity |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201187358Y true CN201187358Y (en) | 2009-01-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200219377U Expired - Fee Related CN201187358Y (en) | 2008-05-08 | 2008-05-08 | Forged steel integrated piston made by laser welding with closed internal cooling oil cavity |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201187358Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104343575A (en) * | 2014-08-29 | 2015-02-11 | 大连滨城活塞制造有限公司 | Novel piston top of gas engine |
| CN108067808A (en) * | 2016-11-11 | 2018-05-25 | 强莉莉 | A kind of reproducing method of steel pistons |
| CN112548506A (en) * | 2020-12-11 | 2021-03-26 | 湖南江滨机器（集团）有限责任公司 | Remanufacturing method of steel piston |
-
2008
- 2008-05-08 CN CNU2008200219377U patent/CN201187358Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104343575A (en) * | 2014-08-29 | 2015-02-11 | 大连滨城活塞制造有限公司 | Novel piston top of gas engine |
| CN108067808A (en) * | 2016-11-11 | 2018-05-25 | 强莉莉 | A kind of reproducing method of steel pistons |
| CN112548506A (en) * | 2020-12-11 | 2021-03-26 | 湖南江滨机器（集团）有限责任公司 | Remanufacturing method of steel piston |
| CN112548506B (en) * | 2020-12-11 | 2022-07-05 | 湖南江滨机器（集团）有限责任公司 | Remanufacturing method of steel piston |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090128 Termination date: 20120508 |