CN102865344A - Crank connecting rod assembly for two-stroke engine and method for processing threads on crank - Google Patents
Crank connecting rod assembly for two-stroke engine and method for processing threads on crank Download PDFInfo
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- CN102865344A CN102865344A CN2012102972263A CN201210297226A CN102865344A CN 102865344 A CN102865344 A CN 102865344A CN 2012102972263 A CN2012102972263 A CN 2012102972263A CN 201210297226 A CN201210297226 A CN 201210297226A CN 102865344 A CN102865344 A CN 102865344A
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- crank
- connecting rod
- stroke engine
- needle bearing
- screw thread
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Abstract
The invention relates to an engine crank, in particular to a crank connecting rod assembly for a two-stroke engine. The crank connecting rod assembly for the two-stroke engine consists of a left crank, a right crank, a connecting rod, a crank pin and a needle bearing, wherein the lower end of the connecting rod is connected with the left crank and the right crank through the crank pin and the needle bearing; and fit clearances among the connecting rod, the crank pin and the needle bearing are 0.012-0.018mm. The crank connecting rod assembly has the advantages that by optimization and structural improvement, a lubricating condition of the crank connecting rod assembly is reduced, the overall reliability of the crank is increased, the engine runs stably, noise is reduced, a durability test of an overall rack of the engine is strengthened, the fuel consumption rate is reduced, and by a series of improvements such as optimization of a gas squeezing structure of a shell of the engine and the improvement of a cylinder body, emission pollutants and particles of the two-stroke engine completely meet requirements on a second stage of the national standard GB/T21633-2000.
Description
Technical field
The present invention relates to engine crankshaft, is a kind of two stroke engine crank-connecting rod group.
Background technique
Connecting rod is that motor is realized work cycle, finishes the main movement part of transformation of energy.The Chinese government more and more payes attention to environmental protection and the higher requirement of energy-saving and cost-reducing proposition in recent years; For mini engine and component manufacturing thereof; associating State General Administration for Quality Supervision of China environmental protection section is in establishment in the end of the year 2010 and issued the first standard GB/T 26133-2010 of China " restriction of mini engine tailpipe emission and method of measurement " (first and second stage of China), and this standard and European Union's standard and USS United States Standard are basically identical.
Summary of the invention
The object of the invention is to rush by the structure optimization below the bent axle and innovation and two improvement and the optimization of other Component of motor, come it to improve the reliability and stability of motor, so that tail gas discharging pollutant satisfies the second stage requirement of standard GB/T/T21633-2000 fully, provide that a kind of connecting rod and crank fit up gap, the left and right sides are more accurate, two stroke engine crank-connecting rod group various and that reliability is high conforms.
Purpose of the present invention realizes by following approach:
A kind of two stroke engine crank-connecting rod group, formed by left crank, right crank, connecting rod, crank pin, needle bearing, the lower end of connecting rod by crank pin and needle bearing and left crank be connected crank and be connected, the matching gap of described connecting rod, crank pin and needle bearing is 0.012-0.018mm.
Described right crank adopts three layers of stepped construction, is comprised of right crank dress pedestal, the right crank charge of oil envelope diameter of axle and right crank screw thread.
Described right crank charge of oil envelope diameter of axle length is 14-16mm.
Described connecting rod tip top increases oilhole and is convenient to lubricate, dispel the heat.
There is Woodruff key slots and keyways at described left crank frustum place.
The present invention also provides left and right sides crank Screw thread process method to be: behind the blank forging, and left and right sides crank screw thread roughing, then the semi finishing core diameter of thread carries out carburizing heat treatment to left and right sides crank; Thread surface is done conservation treatment, does screw thread fine finishing again, to left and right sides crank secondary heat treatment again; Last machining screw is to the finished product requirement, and is above for guaranteeing the sufficient toughness of thread root, avoids the screw thread fracture, increases reliability and the working life of product.
The invention has the beneficial effects as follows:
By improving precision and the automaticity of processing and Inspection equipment, make connecting rod and left and right sides crank three's fit up gap be controlled at the 0.012-0.018mm scope, optimize the fit up gap of connecting rod and left and right sides crank and the roughness of fitting surface, reduced the requirement of integral shaft to lubricating condition.
Be increased to 14-16mm by right crank charge of oil director Feng degree length, be used for increasing tail gas cleaning passage and other series of measures such as grade, so that oil inflame is more abundant.
Increase oilhole by the connecting rod tip top, be used for lubricating, dispelling the heat, reach the raising reliability and help the raising life-span.
Innovate by left and right sides crank Thread Machining Process, behind the blank forging, left and right sides crank screw thread roughing, then the semi finishing core diameter of thread carries out carburizing heat treatment to left and right sides crank; Thread surface is done conservation treatment, does screw thread fine finishing again, to left and right sides crank secondary heat treatment again; Last machining screw is to the finished product requirement, and is above for guaranteeing the sufficient toughness of thread root, avoids the screw thread fracture, increases reliability and the working life of product.
By optimizing and the structure lifting, make its lubricating condition reduce the whole crank shaft Reliability Enhancement, the motor operation is more steady, and noise also has reduction, and the whole stand endurance test of motor is strengthened, increase tail gas cleaning passage and other series of measures such as grade, so that oil inflame is more abundant.Fuel consumption rate reduces, and cooperates a series of improvement such as the structure optimization of motor body squish, cylinder body improvement, and two stroke engine of the present invention discharges pollutants and particle satisfies the requirement of China's second stage fully.
Description of drawings
Below in conjunction with accompanying drawing the present invention is described in further detail:
Fig. 1 is structural representation of the present invention;
1 is left crank, and 2 is right crank, and 3 is connecting rod, and 4 is crank pin, and 5 is needle roller, 6 is needle bearing, and 7 is right crankshaft cushion cap, and 8 is the right crank charge of oil envelope diameter of axle, and 9 is right crank screw thread, 10 is left crank screw thread, and 11 is left crank frustum, and 12 is Woodruff key slots and keyways, and 13 is oilhole.
Embodiment
As shown in Figure 1, a kind of two stroke engine of the present invention crank-connecting rod group, formed by left crank 1, right crank 2, connecting rod 3, crank pin 4, needle bearing 6, the lower end of connecting rod 3 by crank pin 4 are connected with needle bearing with left crank 1 be connected crank 2 and be connected, the matching gap of described connecting rod 3, crank pin 4 and needle bearing 6 is 0.012-0.018mm.
Described right crank 2 adopts three layers of stepped construction, is comprised of right crank dress pedestal 7, the right crank charge of oil envelope diameter of axle 8 and right crank screw thread 9.
The described right crank charge of oil envelope diameter of axle 8 length are 14-16mm.
Described connecting rod 3 large end tops increase oilhole 13 and are convenient to lubricate, dispel the heat.
There is Woodruff key slots and keyways 12 at described left crank frustum 11 places.
Left and right sides crank Screw thread process method is: behind the blank forging, and left and right sides crank screw thread roughing, then the semi finishing core diameter of thread carries out carburizing heat treatment to left and right sides crank; Thread surface is done conservation treatment, does screw thread fine finishing again, to left and right sides crank secondary heat treatment again; Last machining screw is to the finished product requirement, and is above for guaranteeing the sufficient toughness of thread root, avoids the screw thread fracture, increases reliability and the working life of product.
By optimizing and the structure lifting, make its lubricating condition reduce the whole crank shaft Reliability Enhancement, the motor operation is more steady, and noise also has reduction, and the whole stand endurance test of motor is strengthened, increase tail gas cleaning passage and other series of measures such as grade, so that oil inflame is more abundant.Fuel consumption rate reduces, and cooperates a series of improvement such as the structure optimization of motor body squish, cylinder body improvement, and two stroke engine of the present invention discharges pollutants and particle satisfies the requirement of China's second stage fully.
Claims (6)
1. two stroke engine crank-connecting rod group, formed by left crank, right crank, connecting rod, crank pin, needle bearing, the lower end of connecting rod by crank pin and needle bearing and left crank be connected crank and be connected, it is characterized in that: the matching gap of described connecting rod, crank pin and needle bearing is 0.012-0.018mm.
2. a kind of two stroke engine crank-connecting rod group as claimed in claim 1 is characterized in that: described right crank adopts three layers of stepped construction, is comprised of right crank dress pedestal, the right crank charge of oil envelope diameter of axle and right crank screw thread.
3. a kind of two stroke engine crank-connecting rod group as claimed in claim 2 is characterized in that: described right crank charge of oil envelope diameter of axle length is 14-16mm.
4. a kind of two stroke engine crank-connecting rod group as claimed in claim 2 is characterized in that: described connecting rod tip top increases oilhole and is convenient to lubricate, dispel the heat.
5. a kind of two stroke engine crank-connecting rod group as claimed in claim 1, it is characterized in that: there is Woodruff key slots and keyways at described left crank frustum place.
6. a kind of two stroke engine crank-connecting rod group as claimed in claim 1, left and right sides crank Screw thread process method is:
Behind the blank forging, left and right sides crank screw thread roughing, then the semi finishing core diameter of thread carries out carburizing heat treatment to left and right sides crank;
Thread surface is done conservation treatment, does screw thread fine finishing again, to left and right sides crank secondary heat treatment again;
Last machining screw is to the finished product requirement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102972263A CN102865344A (en) | 2012-08-21 | 2012-08-21 | Crank connecting rod assembly for two-stroke engine and method for processing threads on crank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102972263A CN102865344A (en) | 2012-08-21 | 2012-08-21 | Crank connecting rod assembly for two-stroke engine and method for processing threads on crank |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102865344A true CN102865344A (en) | 2013-01-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012102972263A Pending CN102865344A (en) | 2012-08-21 | 2012-08-21 | Crank connecting rod assembly for two-stroke engine and method for processing threads on crank |
Country Status (1)
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| CN (1) | CN102865344A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103912571A (en) * | 2014-03-18 | 2014-07-09 | 永康市嘉宏工具制造有限公司 | Gasoline engine crushing pickaxe, electric crushing pickaxe or percussion drill-type impact crank structure |
| CN109648264A (en) * | 2018-12-25 | 2019-04-19 | 上海安皑迪实业有限公司 | A kind of processing technology of metal base upper boom connection |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5088345A (en) * | 1990-06-09 | 1992-02-18 | Stihl Andreas | Composite crankshaft for a two-stroke engine |
| JPH09264156A (en) * | 1996-03-28 | 1997-10-07 | Koyo Seiko Co Ltd | Crankshaft supporting structure for 2-cycle engine |
| CN201321895Y (en) * | 2008-12-04 | 2009-10-07 | 重庆歇马机械曲轴有限公司 | Crank connecting rod assembly of dune buggy engine |
| CN101798954A (en) * | 2009-02-10 | 2010-08-11 | 重庆动源摩托车配件销售有限公司 | Crank-connecting rod mechanism for engine of miniature cross-country motorcycle |
| CN101936328A (en) * | 2010-08-23 | 2011-01-05 | 青岛迈特动力部件有限公司 | Four-stroke crankshaft |
| CN202812031U (en) * | 2012-08-21 | 2013-03-20 | 青岛迈特园林机械零部件有限公司 | Crank connecting rod group used for two-stroke engine |
-
2012
- 2012-08-21 CN CN2012102972263A patent/CN102865344A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5088345A (en) * | 1990-06-09 | 1992-02-18 | Stihl Andreas | Composite crankshaft for a two-stroke engine |
| JPH09264156A (en) * | 1996-03-28 | 1997-10-07 | Koyo Seiko Co Ltd | Crankshaft supporting structure for 2-cycle engine |
| CN201321895Y (en) * | 2008-12-04 | 2009-10-07 | 重庆歇马机械曲轴有限公司 | Crank connecting rod assembly of dune buggy engine |
| CN101798954A (en) * | 2009-02-10 | 2010-08-11 | 重庆动源摩托车配件销售有限公司 | Crank-connecting rod mechanism for engine of miniature cross-country motorcycle |
| CN101936328A (en) * | 2010-08-23 | 2011-01-05 | 青岛迈特动力部件有限公司 | Four-stroke crankshaft |
| CN202812031U (en) * | 2012-08-21 | 2013-03-20 | 青岛迈特园林机械零部件有限公司 | Crank connecting rod group used for two-stroke engine |
Non-Patent Citations (1)
| Title |
|---|
| 李树茗: "摩托车用曲轴总成径向间隙非破坏性检测法", 《摩托车技术》, no. 3, 15 June 1994 (1994-06-15), pages 16 - 17 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103912571A (en) * | 2014-03-18 | 2014-07-09 | 永康市嘉宏工具制造有限公司 | Gasoline engine crushing pickaxe, electric crushing pickaxe or percussion drill-type impact crank structure |
| CN109648264A (en) * | 2018-12-25 | 2019-04-19 | 上海安皑迪实业有限公司 | A kind of processing technology of metal base upper boom connection |
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Application publication date: 20130109 |