CN202883144U - Novel piston pin - Google Patents
Novel piston pin Download PDFInfo
- Publication number
- CN202883144U CN202883144U CN 201220554730 CN201220554730U CN202883144U CN 202883144 U CN202883144 U CN 202883144U CN 201220554730 CN201220554730 CN 201220554730 CN 201220554730 U CN201220554730 U CN 201220554730U CN 202883144 U CN202883144 U CN 202883144U
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- CN
- China
- Prior art keywords
- main body
- body portion
- piston pin
- hole
- endoporus
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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.)
- Expired - Fee Related
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- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
The utility model relates to a novel piston pin which comprises a main body portion. An inner hole is arranged in the main body portion, two ends of the inner hole are symmetrically arranged, the inner hole is sequentially provided with a chamfer conical hole, a first round hole, a second round hole and a third round hole from outside to inside, a plurality of oil passing holes are arranged in the main body portion in the radial portion, and the oil passing holes are communicated with the inner hole. The piston pin is simple and symmetrical in structure, convenient to process and high in processing accuracy, 20CrMnTi is utilized, the wall thickness reaches to 25mm, and carburization and quenching time can be prolonged to 17 hours to enable product quality to be stable.
Description
Technical field
The utility model relates to a kind of constituent elements of large-scale marine engine, is specifically related to a kind of Novel piston pin, and it is used for connecting piston and connecting rod and the gas load that piston bears is passed to connecting rod.
Background technique
Marine engine is generally large-scale diesel engine, and its single-machine capacity is 1108KW-1960KW, and power per cylinder is 185-245KW, and belonging to one-level increases motor.The working principle of this motor is the same with the principle of common engine, and the assembling of different is wrist pin and piston has increased the device of inner sleeve, and oil-through hole is arranged on the wrist pin.
Wrist pin is used for connecting piston and connecting rod, and the power that piston bears is passed to connecting rod or opposite.Wrist pin bears very large periodic shock load under high temperature condition, and because wrist pin pendulum angle in pin-and-hole is little, be difficult to form lubricant film, so lubricating condition is relatively poor.Wrist pin must have enough rigidity, intensity and wear resistance for this reason, and quality is as far as possible little, and pin should have suitable matching gap and good surface quality with pin-and-hole.In the ordinary course of things, the rigidity of wrist pin is particularly important, if wrist pin occurs bending and deformation, piston pin boss is damaged.
The structure shape of wrist pin is very simple, is a thick-wall hollow cylinder basically.Hole shape has cylindrical, two sections truncated cone shapes and combination shape in it.The cylindrical hole easy processing, but the quality of wrist pin is larger; Two sections wrist pin quality of cutting the shape endoporus are less, and maximum in the middle because of the suffered moment of flexure of wrist pin, so close to the beam of uniform strength, but cone hole machine is difficult.
The material of wrist pin is generally low carbon steel or low-carbon alloy steel, and such as 20Cr etc., the outer surface carburizing is hardened, and through fine finishing such as correct grinding and polishings, has so both improved surface hardness and wear resistance again, ensures again higher intensity and impact toughness.
Yet because 20Cr is essential coarse grained steel, at high temperature (more than 800 degree) the heating regular hour, crystal grain is grown up gradually; But the wrist pin product is high to requirement of strength, does not allow to produce coarse grain, must be fine acicular tempered martensite.Therefore, this product can not directly utilize carburizing temperature direct quenching, must be cooled to reheat about 600 ℃ to quench, and the process of cooling is exactly the process of crystal grain thinning, but so energy consumption is too large, and production capacity also is restricted.
In view of the foregoing, produce at present the wrist pin product both at home and abroad and adopt cold-extrusion technology more than 90%, the quality of blank directly has influence on the quality of extruded product before the extruding, now in industry blank-making method has: the flat both ends of the surface of band saw blanking+lathe, but there are many shortcomings in it, mainly is that cost is high, production capacity is low, waste of raw materials is large.
Therefore, for avoiding above-mentioned technical problem, necessaryly provide a kind of Novel piston pin, to overcome described defective of the prior art.
The model utility content
For addressing the above problem, the purpose of this utility model is to provide a kind of simple in structure, Novel piston pin that precision is high and easy to process.
For achieving the above object, the technological scheme that the utility model is taked is: a kind of Novel piston pin, and it comprises a main body portion, is provided with an endoporus in main body portion; The two ends of described endoporus are symmetrical arranged, and be provided with successively the chamfering conical bore from outside to inside, the first circular hole, the second circular hole and the 3rd circular hole; Radially be provided with some oil-through holes on described main body portion, this oil-through hole and endoporus are connected.
Novel piston pin of the present utility model further is set to: described the first circular hole and the 3rd circular hole are unidimensional endoporus.
Novel piston pin of the present utility model further is set to: adopt round-corner transition between described endoporus two ends and the 3rd circular hole.
Novel piston pin of the present utility model further is set to: the diameter of described main body portion is 115mm, and length is 216mm, and wall thickness is 25mm.
Novel piston pin of the present utility model also is set to: described main body portion is the main body portion of 20CrMnTi material.
Compared with prior art, the utlity model has following beneficial effect: Novel piston pin of the present utility model is simple in structure and symmetrical, make easy to process and machining accuracy high; It adopts 20CrMnTi, thereby carburizing and quenching time are prolonged greatly, makes quality of product better.
Description of drawings
Fig. 1 is the sectional view of Novel piston pin of the present utility model.
Embodiment
See also shown in the Figure of description 1, the utility model is a kind of Novel piston pin, and it comprises a main body portion 1, and the diameter of this main body portion 1 is 115mm, and length is 216mm, and wall thickness is 25mm.Described main body portion 1 is the main body portion 1 of 20CrMnTi material, the 20CrMnTi material can adopt direct carburizing quenching process, carburizing time has reached 12 hours, and the proper extension quenching time has reached 5 hours, and the carburizing and quenching time has amounted to 17 hours, prolong temper time to 3 hour, adopt this technique, broken through the heat treatment process of traditional miscellaneous goods, realized that excircle dimension is large, the super thick product heat treatment process of wall thickness has reached the usage requirement of wrist pin.
In main body portion 1, be provided with an endoporus 2.The two ends of described endoporus 2 are symmetrical arranged, and be provided with successively chamfering conical bore 3 from outside to inside, the first circular hole 4, the second circular hole 5 and the 3rd circular hole 6.Described the first circular hole 4 and the 3rd circular hole 6 are unidimensional endoporus.Adopt fillet 8 transition between described endoporus 2 two ends and the 3rd circular hole 6.Described the second circular hole 5 is the annular groove pilot hole.
Radially be provided with some oil-through holes 7 on described main body portion 1, this oil-through hole 7 and endoporus 2 are connected.
Novel piston pin of the present utility model can adopt the following steps manufacturing to form: raw material inspection, base, machining order, heat treatment, grinding, fine finishing, cleaning, packing.Be characterized in that product is large, Heavy Weight, inner hole precision be high.
Adopt wagon drill technique before the heat treatment, adopt the method for anchor clamps and coordinate setting to process Geometrical Tolerance Principle and the pitch-row requirement that each oilhole is guaranteed each hole, the boring endoporus adopts Programming on NC Lathe processing, guarantees the size of each endoporus, the length fitted position between two jump-ring slots.
Adopt the direct carburizing of multifunctional box oven, quenching, detailed process as mentioned above.
Grinding comprises inner hole grinding and grinding cylindrical after the heat treatment, because the endoporus tolerance is 0.02mm, must increase the size that the inner hole grinding operation guarantees endoporus.In the cylindrical grinding operation, excircle dimension is larger, and product weight is heavy, has reached the limit of centerless grinding machine, and product is difficult to transmission at the grinding cylindrical, need to readjust technique.When measuring outside diameter, the dial micrometer of measuring excircle dimension is adjusted and improved, the base plate reconditioning attenuation of dial micrometer is detected the scope of external diameter with increase.
In washing process, the wrist pin volume is large, and Heavy Weight can not clean according to traditional spray passing through type technique, is revised as dress intrusive mood ultrasonic cleaning process.
Above embodiment only is the preferred embodiment of this creation, not in order to limiting this creation, all in this creation spirit and principle within make any modification, be equal to replacement, improvement etc., all should be included within the protection domain of this creation.
Claims (5)
1. a Novel piston pin is characterized in that: comprise a main body portion, be provided with an endoporus in main body portion; The two ends of described endoporus are symmetrical arranged, and be provided with successively the chamfering conical bore from outside to inside, the first circular hole, the second circular hole and the 3rd circular hole; Radially be provided with some oil-through holes on described main body portion, this oil-through hole and endoporus are connected.
2. Novel piston pin as claimed in claim 1, it is characterized in that: described the first circular hole and the 3rd circular hole are unidimensional endoporus.
3. Novel piston pin as claimed in claim 2 is characterized in that: adopt round-corner transition between described endoporus two ends and the 3rd circular hole.
4. Novel piston pin as claimed in claim 3, it is characterized in that: the diameter of described main body portion is 115mm, and length is 216mm, and wall thickness is 25mm.
5. Novel piston pin as claimed in claim 4, it is characterized in that: described main body portion is the main body portion of 20CrMnTi material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220554730 CN202883144U (en) | 2012-10-26 | 2012-10-26 | Novel piston pin |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220554730 CN202883144U (en) | 2012-10-26 | 2012-10-26 | Novel piston pin |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202883144U true CN202883144U (en) | 2013-04-17 |
Family
ID=48074580
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220554730 Expired - Fee Related CN202883144U (en) | 2012-10-26 | 2012-10-26 | Novel piston pin |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202883144U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105081692A (en) * | 2015-08-04 | 2015-11-25 | 南车戚墅堰机车有限公司 | Machining method for tapered strength structure of oil hole of piston pin of large-powder diesel engine |
| DE102014219907A1 (en) | 2014-10-01 | 2016-04-07 | Federal-Mogul Nürnberg GmbH | Piston pin for an internal combustion engine and method for producing a piston pin |
-
2012
- 2012-10-26 CN CN 201220554730 patent/CN202883144U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102014219907A1 (en) | 2014-10-01 | 2016-04-07 | Federal-Mogul Nürnberg GmbH | Piston pin for an internal combustion engine and method for producing a piston pin |
| CN105081692A (en) * | 2015-08-04 | 2015-11-25 | 南车戚墅堰机车有限公司 | Machining method for tapered strength structure of oil hole of piston pin of large-powder diesel engine |
| CN105081692B (en) * | 2015-08-04 | 2017-07-11 | 南车戚墅堰机车有限公司 | A kind of processing method of the gradual change type strength structure of piston of high power diesel engine pin oilhole |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130417 Termination date: 20151026 |
|
| EXPY | Termination of patent right or utility model |