CN102135130A - Spheroidal cast iron crankshaft with novel oil hole structure - Google Patents
Spheroidal cast iron crankshaft with novel oil hole structure Download PDFInfo
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- CN102135130A CN102135130A CN2011101133204A CN201110113320A CN102135130A CN 102135130 A CN102135130 A CN 102135130A CN 2011101133204 A CN2011101133204 A CN 2011101133204A CN 201110113320 A CN201110113320 A CN 201110113320A CN 102135130 A CN102135130 A CN 102135130A
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- connecting rod
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- oil hole
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Abstract
The invention relates to a spheroidal cast iron crankshaft with a novel oil hole structure. Each mainshaft neck is provided with a mainshaft straight oil hole in a drilling way; each connecting rod neck is provided with a connecting rod straight oil hole in a drilling way; and the mainshaft straight oil hole on each mainshaft neck is communicated with the connecting rod straight oil hole of the adjacent connecting rod neck by an inclined oil hole. The mainshaft straight oil hole and the connecting hole straight oil holt that are communicated with each other are vertical to a plane that is determined by the coplanar axial central lines of the connecting neck and the mainshaft neck; and the inclined oil hole is arranged on the plane and passes through a crankshaft arm so that the connecting rod neck straight oil hole is communicated with the mainshaft neck straight oil hole. In the invention, the stress concentration at the connecting rod neck oil hole is reduced, and the anti-torsional fatigue strength of the spheroidal cast iron crankshaft can be improved, so that the shaft breaking rate of the spheroidal cast iron crankshaft can be reduced obviously.
Description
Technical field
The present invention relates to a kind of engine crankshaft, specifically a kind of ductile iron crankshaft of novel oilhole structure.
Background technique
When bent axle runs up, need oil lubrication between axle journal and the bearing shell in motor, provide lubricant oil so need bore oilhole on bent axle, the existence of these oilholes can reduce the antitorque commentaries on classics fatigue strength of bent axle to a certain extent.At present a lot of engine crankshafts adopt the forged steel material, though forged steel has good antifatigue, resistant to bending performance, the processing technology of forged steel crankshaft is comparatively complicated, and manufacturing efficiency is low, the cost height.Therefore, those skilled in the art expect to use always comprehensive mechanical performance preferably spheroidal graphite cast iron substitute forged steel and produce bent axle, although known spheroidal graphite cast iron has good comprehensive mechanical performance in the present technique field, but its antifatigue, resistant to bending ability are inferior to forged steel, so directly replace forged steel to produce bent axle simply with spheroidal graphite cast iron, and the structure of bent axle itself do not done corresponding adjust or change, the ductile iron crankshaft of producing like this is the technical requirements that can not satisfy the user.At present a lot of engine crankshafts (is example with tin bavin 81D), the oilhole structure of employing is: bore straight oilhole on main journal, do not bore straight oilhole on the connecting rod neck, the connecting rod neck links to each other with straight oilhole on the main journal by inclined oil hole of air.This oilhole structure can make generation very big warping stress concentration phenomenon in inclined oil hole of air place on the connecting rod neck, greatly reduces the antitorque commentaries on classics fatigue strength of bent axle.Actual proof, a lot of off-axises all begin to rupture from connecting rod neck inclined oil hole of air.Along with the design of motor develops towards speed up, compactness, light-weighted direction, mechanical load constantly increases, and strength of crankshaft is had higher requirement.This oilhole structure has reduced the antitorque commentaries on classics fatigue strength of bent axle, can not satisfy the requirement of modern motor development to crankshaft strength.
Summary of the invention
Technical problem to be solved by this invention is to overcome above-mentioned the deficiencies in the prior art, provides a kind of rational in infrastructure, processes easyly, and antitorque commentaries on classics fatigue strength height reduces and avoids the ductile iron crankshaft of bent axle from the novel oilhole structure of connecting rod neck inclined oil hole of air fracture.
The technological scheme that the present invention solves the problems of the technologies described above employing is: a kind of ductile iron crankshaft of novel oilhole structure, it is characterized in that: be drilled with the straight oilhole of a main shaft on its each main journal, be drilled with the straight oilhole of a connecting rod on each connecting rod neck, the straight oilhole of the main shaft on each main journal is communicated with by an inclined oil hole of air with the straight oilhole of connecting rod on the adjacent connecting rod neck.
The plane that straight oilhole of the main shaft of connection of the present invention and the straight oilhole of connecting rod are determined perpendicular to the longitudinal center line coplane of place connecting rod neck and main journal, described inclined oil hole of air is positioned on this plane, inclined oil hole of air penetrates crankweb, and straight oilhole of connecting rod neck and the straight oilhole of main journal are communicated with.
The straight oilhole of main shaft of the present invention is positioned at the main journal center, penetrates main journal in the main journal center; The straight oilhole of described connecting rod penetrates the connecting rod neck in the 5mm place below connecting rod neck longitudinal center line.
Straight oilhole of connecting rod of the present invention and the straight oilhole of main shaft and inclined oil hole of air joint are respectively equipped with the oilhole fillet, and the straight oilhole diameter of connecting rod is identical with the straight oilhole diameter of oilhole fillet diameter and main shaft.
The present invention bores oilhole always on each main journal, compare with the crude oil hole structure bent axle of same model, change has taken place in this straight oil-hole location, but the oilhole diameter is constant, and the rounding diameter of the straight oilhole of main journal of the diameter of oilhole rounding and crude oil hole structure is consistent.On each connecting rod neck, bore oilhole always, do not have straight oilhole on the crude oil hole structure crank-shaft link neck of same model.The straight oilhole of described connecting rod neck in the shape of connecting rod neck surface than the inclined oil hole of air of prior art regular shape on connecting rod neck surface, substantially rounded, but not the oblong of former inclined oil hole of air structure, reduce the warping stress concentration phenomenon at this place greatly, thereby improved the antitorque commentaries on classics fatigue strength of bent axle.Utilize finite element method, by analog computation, the antitorque commentaries on classics fatigue ratio of the bent axle after the improvement can improve about 33% originally.Against existing technologies, the present invention is rational in infrastructure, processes easy, the stress that has reduced connecting rod neck oilhole place is concentrated, improved the antitorque commentaries on classics fatigue strength of bent axle, fundamentally reduced and avoided bent axle from connecting rod neck inclined oil hole of air fracture, ductile iron crankshaft off-axis rate obviously descends.
Description of drawings
The invention will be further described below in conjunction with accompanying drawing.
Fig. 1 is a structural representation of the present invention.
Fig. 2 be among Fig. 1 A-A to generalized section.
Label is among Fig. 1: 1. the straight oilhole of connecting rod, 2. inclined oil hole of air, the 3. straight oilhole of main shaft.
Embodiment
As can be seen from Figure 1, the ductile iron crankshaft of a kind of novel oilhole structure of the present invention, be drilled with the straight oilhole 3 of a main shaft on its each main journal, be drilled with the straight oilhole 1 of a connecting rod on each connecting rod neck, the straight oilhole 3 of the main shaft on each main journal is communicated with by an inclined oil hole of air 2 with the straight oilhole 1 of connecting rod on the adjacent connecting rod neck.
As can be seen from Figure 2, straight oilhole 3 of the main shaft of connection of the present invention and the straight oilhole 1 of connecting rod are perpendicular to the definite plane of the longitudinal center line coplane of place connecting rod neck and main journal.And the straight oilhole 3 of described main shaft is positioned at the main journal center, penetrates main journal in the main journal center; The straight oilhole 1 of described connecting rod penetrates the connecting rod neck in the 5mm place below connecting rod neck longitudinal center line.That is to say the plane that the straight oilhole 1 of described connecting rod is determined perpendicular to the longitudinal center line coplane of place connecting rod neck and main journal, and on the connecting rod neck, be located axially at connecting rod neck center, be positioned at 5mm place, connecting rod neck longitudinal center line below on radially.Setting the plane that the longitudinal center line coplane of connecting rod neck and main journal determines is the A face, and a plane of passing connecting rod neck longitudinal center line and vertical A face is the B face, and so, the straight oilhole 1 of described connecting rod is just in the middle of the connecting rod neck, the 5mm place penetrates the connecting rod neck below the B face.
It can also be seen that from Fig. 2 described inclined oil hole of air 2 is positioned on the plane that the longitudinal center line coplane of connecting rod neck and main journal determines, inclined oil hole of air 2 penetrates crankweb, and straight oilhole 1 of connecting rod neck and the straight oilhole 3 of main journal are communicated with.
The straight oilhole 3 of straight oilhole 1 of the said connecting rod of the present invention and main shaft is provided with the oilhole fillet with inclined oil hole of air 2 joints, and straight oilhole 1 diameter of connecting rod is identical with straight oilhole 3 diameters of oilhole fillet diameter and main shaft.That is to say that straight oilhole 1 of connecting rod and the straight oilhole 3 of main shaft will carry out the oilhole rounding and handle, inclined oil hole of air is without rounding.
The present invention bores oilhole always on each main journal, compare with the crude oil hole structure bent axle of same model, change has taken place in this straight oil-hole location, but the oilhole diameter is constant, and the rounding diameter of the straight oilhole of main journal of the diameter of oilhole rounding and crude oil hole structure is consistent.On each connecting rod neck, bore oilhole always, do not have straight oilhole on the crude oil hole structure crank-shaft link neck of same model.The straight oilhole of described connecting rod neck in the shape of connecting rod neck surface than the inclined oil hole of air of prior art regular shape on connecting rod neck surface, substantially rounded, but not the oblong of former inclined oil hole of air structure, reduce the warping stress concentration phenomenon at this place greatly, thereby improved the antitorque commentaries on classics fatigue strength of bent axle.Utilize finite element method, by analog computation, the antitorque commentaries on classics fatigue ratio of the bent axle after the improvement can improve about 33% originally.
The present invention adopts above-mentioned oilhole structure, reduced the stress value at connecting rod neck oilhole place greatly, its antitorque ability of changeing tired is improved, thereby satisfied the requirement of user to the antitorque commentaries on classics fatigue strength of ductile iron crankshaft, practice shows has adopted ductile iron crankshaft off-axis rate of the present invention obviously to descend.Same model bent axle described in the present invention means the bent axle that meets same technical standard, and described technical standard comprises all technical standards such as NBS, industry standard and company standard.The present invention is rational in infrastructure, processes easyly, and the stress that has reduced connecting rod neck oilhole place is concentrated, and has improved the antitorque commentaries on classics fatigue strength of bent axle, fundamentally reduces and has avoided bent axle from the fracture of connecting rod neck inclined oil hole of air, and ductile iron crankshaft off-axis rate obviously descends.
Claims (4)
1. the ductile iron crankshaft of a novel oilhole structure, it is characterized in that: be drilled with the straight oilhole of a main shaft on its each main journal, be drilled with the straight oilhole of a connecting rod on each connecting rod neck, the straight oilhole of the main shaft on each main journal is communicated with by an inclined oil hole of air with the straight oilhole of connecting rod on the adjacent connecting rod neck.
2. the ductile iron crankshaft of novel oilhole structure according to claim 1, it is characterized in that: the plane that straight oilhole of the main shaft of described connection and the straight oilhole of connecting rod are determined perpendicular to the longitudinal center line coplane of place connecting rod neck and main journal, described inclined oil hole of air is positioned on this plane, inclined oil hole of air penetrates crankweb, and straight oilhole of connecting rod neck and the straight oilhole of main journal are communicated with.
3. the ductile iron crankshaft of novel oilhole structure according to claim 2 is characterized in that: the straight oilhole of described main shaft is positioned at the main journal center, penetrates main journal in the main journal center; The straight oilhole of described connecting rod penetrates the connecting rod neck in the 5mm place below connecting rod neck longitudinal center line.
4. the ductile iron crankshaft of novel oilhole structure according to claim 1, it is characterized in that: straight oilhole of described connecting rod and the straight oilhole of main shaft and inclined oil hole of air joint are respectively equipped with the oilhole fillet, and the straight oilhole diameter of connecting rod is identical with the straight oilhole diameter of oilhole fillet diameter and main shaft.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101133204A CN102135130A (en) | 2011-05-04 | 2011-05-04 | Spheroidal cast iron crankshaft with novel oil hole structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101133204A CN102135130A (en) | 2011-05-04 | 2011-05-04 | Spheroidal cast iron crankshaft with novel oil hole structure |
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| CN102135130A true CN102135130A (en) | 2011-07-27 |
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| CN2011101133204A Pending CN102135130A (en) | 2011-05-04 | 2011-05-04 | Spheroidal cast iron crankshaft with novel oil hole structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102434244A (en) * | 2011-11-17 | 2012-05-02 | 东风朝阳柴油机有限责任公司 | H-shaped cooling lubricating oil channel for crank shaft |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2858505B2 (en) * | 1992-05-08 | 1999-02-17 | 三菱自動車工業株式会社 | Crankshaft crankpin structure |
| CN100580260C (en) * | 2007-06-12 | 2010-01-13 | 天润曲轴股份有限公司 | Nodular cast iron crankshaft of engine |
| US20100107808A1 (en) * | 2008-08-01 | 2010-05-06 | Cummins Inc. | Method for increasing torsional fatigue strength in crankshafts |
| CN202031968U (en) * | 2011-05-04 | 2011-11-09 | 天润曲轴股份有限公司 | Ductile cast iron crankshaft with novel oil hole structure |
-
2011
- 2011-05-04 CN CN2011101133204A patent/CN102135130A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2858505B2 (en) * | 1992-05-08 | 1999-02-17 | 三菱自動車工業株式会社 | Crankshaft crankpin structure |
| CN100580260C (en) * | 2007-06-12 | 2010-01-13 | 天润曲轴股份有限公司 | Nodular cast iron crankshaft of engine |
| US20100107808A1 (en) * | 2008-08-01 | 2010-05-06 | Cummins Inc. | Method for increasing torsional fatigue strength in crankshafts |
| CN202031968U (en) * | 2011-05-04 | 2011-11-09 | 天润曲轴股份有限公司 | Ductile cast iron crankshaft with novel oil hole structure |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102434244A (en) * | 2011-11-17 | 2012-05-02 | 东风朝阳柴油机有限责任公司 | H-shaped cooling lubricating oil channel for crank shaft |
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Application publication date: 20110727 |