CN104165101B - Composite piston pin for internal combustion engine - Google Patents
Composite piston pin for internal combustion engine Download PDFInfo
- Publication number
- CN104165101B CN104165101B CN201410385400.9A CN201410385400A CN104165101B CN 104165101 B CN104165101 B CN 104165101B CN 201410385400 A CN201410385400 A CN 201410385400A CN 104165101 B CN104165101 B CN 104165101B
- Authority
- CN
- China
- Prior art keywords
- piston pin
- matrix
- obturator
- pin matrix
- combustion engine
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- 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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- 239000002131 composite material Substances 0.000 title claims abstract description 13
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 11
- 239000011159 matrix material Substances 0.000 claims abstract description 49
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 10
- 239000010959 steel Substances 0.000 claims abstract description 10
- 239000000463 material Substances 0.000 claims description 12
- 229910000838 Al alloy Inorganic materials 0.000 claims description 8
- 239000007787 solid Substances 0.000 claims description 3
- 238000011049 filling Methods 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 6
- 238000005299 abrasion Methods 0.000 abstract description 2
- 230000001603 reducing effect Effects 0.000 abstract description 2
- 238000005452 bending Methods 0.000 abstract 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000005336 cracking Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005242 forging Methods 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 230000004580 weight loss Effects 0.000 description 2
- 239000004411 aluminium Substances 0.000 description 1
- 238000005255 carburizing Methods 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
Abstract
The invention discloses a composite piston pin for an internal combustion engine. The composite piston pin comprises a piston pin matrix and a filling body located in the piston pin matrix. The piston pin matrix is in a cylinder shape, the inner surface of the piston pin matrix is smooth and straight, and the thickness of the piston pin matrix is 10-35 percent of the external diameter of the cylinder of the piston pin matrix. The shape of the outer surface of the filling body is matched with the shape of an inner hole of the piston pin matrix, the filling body is pressed into the piston pin matrix in an extruding mode, and the filling body is in interference fit with the piston pin matrix. Due to the fact that the piston pin is internally provided with the filling body, the piston pin matrix is supported, the strength of the piston pin can be enhanced, bending deformation and ellipse deformation caused during working can be reduced, the local contact stress between the piston pin and the piston pin hole are reduced, abrasion between the piston pin and the pin hole is reduced, and the risk that the piston pin looses the effect is reduced. The thickness of the piston pin steel matrix can be adjusted in a large range on the basis that the rigidity and strength are guaranteed, and the overall weight reducing effect is obvious.
Description
Technical field
The present invention relates to a kind of internal combustion engine composite piston pin.
Background technology
In recent years, engine is constantly developing towards high power, high load capacity and light-weighted direction, therewith to piston pin
Weight, intensity and reliability etc. it is also proposed higher requirement, this be accomplished by from structure and material constantly being reformed and
Optimize.
Piston pin is in the inside of cylinder, forms high-speed motion during work, and inertia force is larger, starts particularly with high speed
Machine, reciprocal inertia force reaches as high as more than 3000 times conducting oneself with dignity, and therefore reducing weight is to be considered in structure design one
Key factor.In addition, piston pin transmits load and motion in the course of the work, the flexural deformation thus causing is to lead to piston pin
Hole cracking and the main cause of piston pin inefficacy, thus the rigidity of structure is also the factor that be must take in design process.For this reason,
Domestic outer piston pin manufactures and designs business and is devoted to developing new structure lightweight, that intensity is high, and topmost method is to subtract
Thin-walled is thick, though this method can effectively reduce the weight of piston pin, there is also some shortcomings.First wall thickness reduction have certain
Limit, excessively thin wall thickness can make intensity can not meet requirement；Secondly, in surfaces externally and internally carburizing process, core carburized layer thickness is not
Easy to control, easy through hardening during quenching, reduces the comprehensive mechanical performance of piston pin；In addition it is to make up thinning wall thickness under high load capacity operating mode
The impact that intensity is caused, needs to carry out diamond-like coating process in piston pin surface, so that cost is significantly increased.
In view of this, how to reduce the weight of piston pin and ensure that the structural strength of piston pin becomes those skilled in the art urgently
The problem that need to solve.
Chinese patent cn 102878286 a discloses a kind of interior reinforcing type piston pin, and it is added using putting into one in pin cylinder
Gu block, the more position of stress in the middle of pin is made to be reinforced.But, this patent only provides from the angle of stress and supports, and supports
Effect and validity not clear and definite, and, adding reinforcement block in middle part, to be likely to cause middle rigidity excessive, thus drawing
Play both sides transitional region tension to increase sharply or even Cracking Failure.
Content of the invention
The purpose of the present invention is for overcoming above-mentioned the deficiencies in the prior art, providing a kind of internal combustion engine composite piston pin, should
Piston pin reduces the weight of piston pin on the basis of ensureing structural strength, improves the reliability of moving parts and the effect of engine
Rate.
For achieving the above object, the present invention adopts following technical proposals:
A kind of internal combustion engine composite piston pin, including piston pin matrix and position obturator in the inner, described piston pin base
Body is cylindrical, and its inner surface is smooth straight, and piston pin matrix wall thickness is the 10～35% of its cylindrical outer diameter；Described filling
External surface shape and piston pin matrix internal via shape are adapted, obturator be pressed in piston pin matrix by way of extruding and
Both form interference fit.
The length of described obturator is less than the length of piston pin matrix.
Described obturator is hollow form, and its diameter of bore is less than the 30% of piston pin matrix outer diameter.
Described obturator is solid.
There are chamfering or rounding in described piston pin matrix surfaces externally and internally two ends.
Described obturator is aluminium alloy light material.
Described piston pin matrix is steel material.
Described piston pin outer surface of matrix forms matching relationship with piston pin hole and connecting rod small end hole.
By extrusion forging with aluminium alloy bar according to piston pin length segment, at room temperature, by fix on forcing press
Punch applies pressure to the aluminium alloy bar of preparation, and aluminium alloy bar produces plastic flow deformation under three-dimensional compressive stress effect,
Aluminium alloy bar dense structure and have continuous fiber flow direction after deformation, closely can be combined together with piston pin matrix.
With respect to Chinese patent cn 102878286 a mentioning in background technology, composite piston proposed by the invention
Pin, what it was increased in centre is not simple reinforcement block, but the elasticity that mode is arranged on pin endoporus such as to extrude
Obturator, it forms interference fit and piston pin body between, during work can the flexural deformation of banking pin and ovalizing deflection, thus
Reduce and sell the abrasion to piston pin hole and impact.In addition in obturator, the presence of endoporus can make the weight of piston pin, and then
Reduce inertia force during link assembly work, improve the stability of motion in cylinder.
In the present invention, piston pin base inner surface is smooth straight, no step or cone angle, and piston pin matrix is steel body,
Its wall thickness is greatly reduced, and wall thickness is the 30%～70% of conventional piston pin wall thickness.And due to obturator aluminum material close
Degree is far below steel material, and therefore piston pin overall weight reduces by 10%～20% than traditional.
During work, piston pin loads piston pin hole and connecting rod small end hole, and its outer surface forms interference fit or gap with hole
Cooperation, and then transmit motion and load.There is obturator due in the middle of piston pin, matrix is defined with support, therefore can increase
The intensity of piston pin simultaneously reduces the flexural deformation being occurred during work and ovalizing deflection, and then reduce the office and between piston pin hole
Portion's contact stress, reduces wearing and tearing between pin and pin-and-hole and reduces the risk that its generation was lost efficacy.In the base that ensure that rigidity and intensity
On plinth, the wall thickness of piston pin steel body can have larger adjustment space, and its overall weight loss effect is notable.
Brief description
A kind of piston pin structural representation that Fig. 1 is provided by the embodiment of the present invention；
Fig. 2 is the longitudinal sectional view of piston pin in Fig. 1；
In figure, 1 is piston pin matrix, and 2 is piston pin obturator, and 3 is base inner surface, and 4 is matrix wall thickness, and 5 is matrix
End-beveling or rounding, 6 is filling external surface, and 7 is obturator internal bore radius, and 8 is filling body length, and 9 is length thereof.
Specific embodiment
The present invention is further described with reference to the accompanying drawings and examples.
As shown in figure 1, Multi-part piston pin, it includes piston pin matrix 1 and piston pin obturator 2.Wherein obturator 2 is
The light materials such as aluminium alloy.
As shown in Fig. 2 piston pin matrix 1 hollow, inner surface 3 is straight, and middle part wall thickness 4 is 2～25mm, and wall thickness is piston pin
The 10～35% of the cylindrical outer diameter of matrix, in addition matrix surfaces externally and internally two ends be provided with chamfering or rounding 5.In matrix 2 endoporus
Insert aluminium bar, make its outer surface 6 and base inner surface 3 form interference fit by way of forging and stamping.Obturator can be hollow form,
It is alternatively solid, its endoporus can be obtained by machining mode, obturator internal bore radius 7 are 0～10mm.The length of obturator
8 are less than length thereof 9.
Piston pin base inner surface is smooth straight, no step or cone angle, and piston pin matrix is steel body, and its wall thickness is significantly
Reduce, wall thickness is the 30%～70% of conventional piston pin wall thickness.And the density due to the aluminum material of obturator is far below steel
Material, therefore piston pin overall weight reduce by 10%～20% than traditional.
During work, piston pin loads piston pin hole and connecting rod small end hole, and its outer surface 3 and hole form interference fit or gap
Cooperation, and then transmit motion and load.Due to there being obturator 2 in the middle of piston pin, support is defined to matrix 1, therefore can increase
Plus the intensity of piston pin reduce the flexural deformation being occurred during work and ovalizing deflection, and then reduce and between piston pin hole
Localized contact stress.On the basis of ensure that rigidity and intensity, the wall thickness of piston pin steel body 1 can have larger adjustment empty
Between, its overall weight loss effect is notable.
Although the above-mentioned accompanying drawing that combines is described to the specific embodiment of the present invention, not model is protected to the present invention
The restriction enclosed, one of ordinary skill in the art should be understood that on the basis of technical scheme, and those skilled in the art are not
Need to pay the various modifications that creative work can make or deformation still within protection scope of the present invention.
Claims (5)
1. a kind of internal combustion engine composite piston pin, is characterized in that, including piston pin matrix and position obturator in the inner, described work
Plug pin matrix is cylindrical, and its inner surface is smooth straight, and piston pin matrix wall thickness is the 10 ~ 35% of its cylindrical outer diameter；Described
Obturator external surface shape is adapted with piston pin matrix internal via shape, and obturator is pressed into piston pin matrix by way of extruding
In and both form interference fit；
Described obturator is hollow form, and its diameter of bore is less than the 30% of piston pin matrix outer diameter；
Described obturator is aluminium alloy light material；
Described piston pin matrix is steel material.
2. internal combustion engine as claimed in claim 1 composite piston pin, is characterized in that, the length of described obturator is less than piston pin
The length of matrix.
3. internal combustion engine as claimed in claim 1 composite piston pin, is characterized in that, described piston pin matrix surfaces externally and internally two ends
There are chamfering or rounding.
4. internal combustion engine as claimed in claim 1 composite piston pin, is characterized in that, described piston pin outer surface of matrix and piston
Pin-and-hole and connecting rod small end hole form matching relationship.
5. a kind of internal combustion engine composite piston pin, is characterized in that, including piston pin matrix and position obturator in the inner, described work
Plug pin matrix is cylindrical, and its inner surface is smooth straight, and piston pin matrix wall thickness is the 10 ~ 35% of its cylindrical outer diameter；Described
Obturator external surface shape is adapted with piston pin matrix internal via shape, and obturator is pressed into piston pin matrix by way of extruding
In and both form interference fit；
Described obturator is solid；
Described obturator is aluminium alloy light material；
Described piston pin matrix is steel material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410385400.9A CN104165101B (en) | 2014-08-06 | 2014-08-06 | Composite piston pin for internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410385400.9A CN104165101B (en) | 2014-08-06 | 2014-08-06 | Composite piston pin for internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104165101A CN104165101A (en) | 2014-11-26 |
| CN104165101B true CN104165101B (en) | 2017-01-18 |
Family
ID=51909057
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410385400.9A Active CN104165101B (en) | 2014-08-06 | 2014-08-06 | Composite piston pin for internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104165101B (en) |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1670564A (en) * | 1925-09-28 | 1928-05-22 | Chrysler Corp | Method of making piston pins |
| US2770511A (en) * | 1954-11-22 | 1956-11-13 | Continental Motors Corp | Wrist pin assembly |
| US4362590A (en) * | 1979-06-25 | 1982-12-07 | Exxon Research And Engineering Co. | Hybrid piston pin |
| JPH07127522A (en) * | 1993-03-30 | 1995-05-16 | Isuzu Motors Ltd | Piston of combustion engine |
| JP2008286288A (en) * | 2007-05-16 | 2008-11-27 | Toyota Motor Corp | Piston structure and engine |
| DE202009014904U1 (en) * | 2009-12-22 | 2010-05-12 | A.G. Porta S.P.A., Beinasco | Piston pin for an internal combustion engine |
| DE102010050345A1 (en) * | 2010-11-05 | 2012-05-10 | Mahle International Gmbh | Hybrid bolt for connecting a piston for an internal combustion engine with a connecting rod and pressing device for producing the hybrid pin |
| CN204113472U (en) * | 2014-08-06 | 2015-01-21 | 山东滨州渤海活塞股份有限公司 | Internal-combustion engine composite piston pin |
-
2014
- 2014-08-06 CN CN201410385400.9A patent/CN104165101B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN104165101A (en) | 2014-11-26 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20170727 Address after: 256600 No. twenty-one, No. 569, Bohai Road, Shandong, Binzhou Patentee after: BINZHOU BOHAI PISTON Co.,Ltd. Address before: 256602, No. 21, 569 Bohai Road, Bincheng District, Shandong, Binzhou Patentee before: SHANDONG BINZHOU BOHAI PISTON Co.,Ltd. |
|
| TR01 | Transfer of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of invention: Composite piston pins for internal combustion engines Granted publication date: 20170118 Pledgee: Binzhou branch of China CITIC Bank Co.,Ltd. Pledgor: BINZHOU BOHAI PISTON Co.,Ltd. Registration number: Y2024980014544 |