CN105952772A - Crankshaft oil hole structure for improving torsional fatigue strength of crankshaft and processing method - Google Patents
Crankshaft oil hole structure for improving torsional fatigue strength of crankshaft and processing method Download PDFInfo
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- CN105952772A CN105952772A CN201610563510.9A CN201610563510A CN105952772A CN 105952772 A CN105952772 A CN 105952772A CN 201610563510 A CN201610563510 A CN 201610563510A CN 105952772 A CN105952772 A CN 105952772A
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- connecting rod
- oilhole
- straight
- oil hole
- trunnion
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C3/00—Shafts; Axles; Cranks; Eccentrics
- F16C3/04—Crankshafts, eccentric-shafts; Cranks, eccentrics
- F16C3/06—Crankshafts
- F16C3/14—Features relating to lubrication
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Ocean & Marine Engineering (AREA)
- Mechanical Engineering (AREA)
- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
Abstract
The invention relates to a crankshaft oil hole structure for improving the torsional fatigue strength of a crankshaft and a processing method. A spindle straight oil hole is drilled in the central part of each main journal; a connecting rod straight oil hole is drilled 5mm beneath a center line of each connecting rod neck; each spindle straight oil hole and each connecting rod straight oil hole are perpendicular to a plane defined by axial center lines of the corresponding main journal and the corresponding connecting rod neck; the spindle straight oil hole in each main journal communicates with the connecting rod straight oil hole in the adjacent connecting rod neck through an inclined oil-hole; and each inclined oil-hole is located in a plane defined by axial center lines of the corresponding main journal and the corresponding connecting rod neck, and penetrates through a crank arm. The crankshaft oil hole structure for improving the torsional fatigue strength of the crankshaft provided by the invention is reasonable in structure, the stress concentration in the inclined oil-holes of connecting rods is greatly reduced, and the torsional fatigue strength of the crankshaft is improved. A tool for drilling the inclined oil-holes can enable the inclined oil-holes to be more accurate in positioning and positioning, and is simpler and more convenient to operate.
Description
Technical field
The present invention relates to a kind of engine crankshaft, a kind of crankshaft oil hole structure and machining method improving crankshaft torsion fatigue strength.
Background technology
Bent axle is one of most important parts in internal combustion engine, and its intensity is directly connected to the reliability of complete machine.Bent axle failure mode mainly has flexural fatigue to lose efficacy and torsional fatigue was lost efficacy two kinds, recently as internal combustion engine towards the development in high power density direction, internal combustion engine volume constantly reduces, power constantly increases, part has reached 18-22MPa, considerably beyond the power of IC engine of traditional 8-12MPa, occur that the ratio that torsional fatigue was lost efficacy in bent axle lost efficacy is gradually increasing therewith.Therefore, the anti-torsion fatigue strength of bent axle is had higher requirement.
Bent axle, when engine interior operates, needs oil lubrication between axle journal and bearing shell, this lubricating oil is to be circulated by the oilhole on crankshaft journal to supply.The oil hole structure that at present a lot of engine crankshafts use is: drill straight oilhole on trunnion, and not drill straight oilhole on connecting rod neck, connecting rod neck is connected with the straight oilhole on trunnion by inclined oil hole of air.This simple in construction, it is simple to processing, is therefore used by most of crankshaft designs manufacturers.This oil hole structure can make to produce at inclined oil hole of air on connecting rod neck the biggest distorting stress concentration phenomenon, greatly reduces the anti-torsion fatigue strength of bent axle.Being drawn by FEM Simulation (FEA), crank-shaft link neck inclined oil hole of air is subject to the position that distorting stress is the weakest, easily causes stress and concentrates, crack under the effect reversing alternate load at inclined oil hole of air, causes bent axle torsional fatigue in early days to be lost efficacy.Actual proof, a lot of off-axises all start fracture at connecting rod neck inclined oil hole of air.Along with the design of electromotor develops towards high speed, densification, light-weighted direction, mechanical load is continuously increased, and has higher requirement the intensity of bent axle.This oil hole structure reduces the anti-torsion fatigue strength of bent axle, it is impossible to meet the Modern Engine development requirement to crankshaft strength.
Summary of the invention
The technical problem to be solved is to overcome above-mentioned the deficiencies in the prior art, it is provided that a kind of rational in infrastructure, and processing simplicity, it is possible to increase crankshaft torsion fatigue strength reduces and avoid the crankshaft oil hole structure and machining method that bent axle ruptures at connecting rod neck inclined oil hole of air.
The present invention solves above-mentioned technical problem and the technical scheme is that a kind of crankshaft oil hole structure improving crankshaft torsion fatigue strength, it is characterized in that: a straight oilhole of main shaft is bored in each trunnion center；A straight oilhole of connecting rod is bored at 5mm below each connecting rod neck centrage；The straight oilhole of main shaft and the straight oilhole of connecting rod are perpendicular to plane determined by trunnion and connecting rod neck longitudinal center line, and main shaft straight oilhole diameter oilhole straight with connecting rod diameter is identical；The straight oilhole of main shaft on each trunnion is connected by an inclined oil hole of air with the straight oilhole of connecting rod on an adjacent connecting rod neck, and inclined oil hole of air is positioned in plane determined by corresponding trunnion and connecting rod neck longitudinal center line, and inclined oil hole of air penetrates crank arm.
The processing method of the crankshaft oil hole structure of the present invention above-mentioned raising crankshaft torsion fatigue strength, is characterized in that: first, installs two fasteners on clamp body principal plane, and two fasteners clamp bent axle the first trunnion and the 7th trunnion respectively；Laying at clamp body simultaneously and equidistantly install six guiders above crank position, each guider has the center of a bullport, the center of bullport and each inclined oil hole of air to be processed of bent axle on the same line；Then boring a straight oilhole of main shaft on each trunnion, the straight oilhole of main shaft is positioned at trunnion center, penetrates trunnion at trunnion center；Each connecting rod neck bores a straight oilhole of connecting rod, the straight oilhole of connecting rod penetrates connecting rod neck at 5mm below connecting rod neck longitudinal center line, the straight oilhole of main shaft and the straight oilhole of connecting rod are perpendicular to plane determined by the longitudinal center line of place trunnion and connecting rod neck, and connecting rod straight oilhole diameter oilhole straight with main shaft diameter is identical；On corresponding crank arm, boring an inclined oil hole of air one by one by each guider, inclined oil hole of air penetrates crank arm, and inclined oil hole of air is positioned in the plane that the longitudinal center line of connecting rod neck and trunnion determines jointly, is connected by straight with connecting rod for straight for main shaft oilhole oilhole；Then process oilhole fillet at the straight oilhole of main shaft and the straight oilhole of connecting rod with inclined oil hole of air junction.
A straight oilhole of connecting rod is bored at 5mm below the present invention each connecting rod neck centrage, the connecting rod straight oilhole shape in connecting rod neck surface is than regular shape on connecting rod neck surface of the inclined oil hole of air of prior art, the most rounded, rather than the oblong of former inclined oil hole of air structure, substantially reduce the distorting stress at this to concentrate, thus improve the anti-torsion fatigue strength of bent axle.Calculated by simulation, improve the bent axle anti-torsion fatigue ratio original structure after oilhole and improve about 30%.Compared with prior art, present configuration is more reasonable, is greatly reduced the stress at connecting-rod inclined oilhole and concentrates, improves the anti-torsion fatigue strength of bent axle.Bore inclined oil hole of air frock and can make the locating and machining of inclined oil hole of air more accurately, operate easier.
Accompanying drawing explanation
The invention will be further described below in conjunction with the accompanying drawings.
Fig. 1 is the oil hole structure schematic diagram of the present invention.
Fig. 2 be in Fig. 1 A-A to generalized section.
Fig. 3 is the inclined oil hole of air processing tool schematic diagram of the present invention.
In figure: 1. the straight oilhole of main shaft, the 2. straight oilhole of connecting rod, 3. inclined oil hole of air；4. clamp body, 5. guider, 6. bent axle, 7. fastener.
Detailed description of the invention
It can be seen that a kind of crankshaft oil hole structure improving crankshaft torsion fatigue strength from Fig. 1, Fig. 2, a straight oilhole of main shaft 1 is bored in each trunnion center；A straight oilhole of connecting rod 2 is bored at 5mm below each connecting rod neck centrage；The straight oilhole of main shaft 1 and the straight oilhole of connecting rod 2 are perpendicular to plane determined by trunnion and connecting rod neck longitudinal center line, and main shaft straight oilhole 1 diameter oilhole straight with connecting rod 2 diameter is identical；The straight oilhole of main shaft 1 on each trunnion is connected by an inclined oil hole of air 3 with the straight oilhole of connecting rod 2 on an adjacent connecting rod neck, and inclined oil hole of air 3 is positioned corresponding in plane determined by trunnion and connecting rod neck longitudinal center line, and inclined oil hole of air 3 penetrates crank arm.
The straight oilhole of connecting rod of the present invention 1 and the straight oilhole of main shaft 3 are provided with oilhole fillet with inclined oil hole of air 2 junction, and connecting rod straight oilhole 1 diameter oilhole straight with main shaft with oilhole fillet diameter 3 diameter is identical.That is the straight oilhole of connecting rod 1 and the straight oilhole of main shaft 3 oilhole to be carried out rounding process, inclined oil hole of air is without rounding.
It it is inclined oil hole of air processing tool schematic diagram of the present invention shown in Fig. 3.Installing two fasteners 7 on clamp body 4 principal plane, two fasteners 7 clamp bent axle 6 first trunnion and the 7th trunnion respectively；Clamp body 4 principal plane equidistantly installs six guiders 5 by bolt above crank position.The bullport of each guider 5 is with corresponding inclined oil hole of air on the same line.
From figure 3, it can be seen that the processing method of the crankshaft oil hole structure of raising crankshaft torsion fatigue strength of the present invention, first, installing two fasteners 7 on clamp body 1 principal plane, two fasteners 7 clamp bent axle the first trunnion and the 7th trunnion respectively；Laying at clamp body simultaneously and equidistantly install six guiders 5 above crank position, each guider 5 has the center of a bullport, the center of bullport and each inclined oil hole of air to be processed of bent axle on the same line.Then boring a straight oilhole of main shaft 1 on each trunnion, the straight oilhole of main shaft 1 is positioned at trunnion center, penetrates trunnion at trunnion center；Each connecting rod neck bores a straight oilhole of connecting rod 2, the straight oilhole of connecting rod 2 penetrates connecting rod neck at 5mm below connecting rod neck longitudinal center line, the straight oilhole of main shaft 1 and the straight oilhole of connecting rod 2 are perpendicular to plane determined by the longitudinal center line of place trunnion and connecting rod neck, and connecting rod straight oilhole 2 diameter oilhole straight with main shaft 1 diameter is identical；On corresponding crank arm, boring an inclined oil hole of air 3 one by one by each guider 5, inclined oil hole of air 3 penetrates crank arm, and inclined oil hole of air 3 is positioned in the plane that the longitudinal center line of connecting rod neck and trunnion determines jointly, is connected by straight with connecting rod for straight for main shaft oilhole 1 oilhole 2；Then process oilhole fillet at the straight oilhole of main shaft 1 and the straight oilhole of connecting rod 2 with inclined oil hole of air 3 junction.And connecting rod straight oilhole 2 diameter oilhole straight with main shaft with oilhole fillet diameter 1 diameter is identical.
A straight oilhole of connecting rod is bored at 5mm below the present invention each connecting rod neck centrage, the connecting rod straight oilhole shape in connecting rod neck surface is than regular shape on connecting rod neck surface of the inclined oil hole of air of prior art, the most rounded, rather than the oblong of former inclined oil hole of air structure, substantially reduce the distorting stress at this to concentrate, thus improve the anti-torsion fatigue strength of bent axle.Calculated by simulation, improve the bent axle anti-torsion fatigue ratio original structure after oilhole and improve about 30%.Present configuration is more reasonable, is greatly reduced the stress at connecting-rod inclined oilhole and concentrates, improves the anti-torsion fatigue strength of bent axle.Bore inclined oil hole of air frock and can make the locating and machining of inclined oil hole of air more accurately, operate easier.
Claims (3)
1. improving a crankshaft oil hole structure for crankshaft torsion fatigue strength, a straight oilhole of main shaft is bored in each trunnion center；A straight oilhole of connecting rod is bored at 5mm below each connecting rod neck centrage；The straight oilhole of main shaft and the straight oilhole of connecting rod are perpendicular to plane determined by trunnion and connecting rod neck longitudinal center line, and main shaft straight oilhole diameter oilhole straight with connecting rod diameter is identical；The straight oilhole of main shaft on each trunnion is connected by an inclined oil hole of air with the straight oilhole of connecting rod on an adjacent connecting rod neck, and inclined oil hole of air is positioned in plane determined by corresponding trunnion and connecting rod neck longitudinal center line, and inclined oil hole of air penetrates crank arm.
The crankshaft oil hole structure of raising crankshaft torsion fatigue strength the most according to claim 1, it is characterized in that: the straight oilhole of described connecting rod and the straight oilhole of main shaft are provided with oilhole fillet with inclined oil hole of air junction, and connecting rod straight oilhole diameter oilhole straight with main shaft with oilhole fillet diameter diameter is identical.
3. a processing method for the crankshaft oil hole structure improving crankshaft torsion fatigue strength described in claim 1, is characterized in that: first, installs two fasteners on clamp body principal plane, and two fasteners clamp bent axle the first trunnion and the 7th trunnion respectively；Laying at clamp body simultaneously and equidistantly install six guiders above crank position, each guider has the center of a bullport, the center of bullport and each inclined oil hole of air to be processed of bent axle on the same line；Then boring a straight oilhole of main shaft on each trunnion, the straight oilhole of main shaft is positioned at trunnion center, penetrates trunnion at trunnion center；Each connecting rod neck bores a straight oilhole of connecting rod, the straight oilhole of connecting rod penetrates connecting rod neck at 5mm below connecting rod neck longitudinal center line, the straight oilhole of main shaft and the straight oilhole of connecting rod are perpendicular to plane determined by the longitudinal center line of place trunnion and connecting rod neck, and connecting rod straight oilhole diameter oilhole straight with main shaft diameter is identical；On corresponding crank arm, boring an inclined oil hole of air one by one by each guider, inclined oil hole of air penetrates crank arm, and inclined oil hole of air is positioned in the plane that the longitudinal center line of connecting rod neck and trunnion determines jointly, is connected by straight with connecting rod for straight for main shaft oilhole oilhole；Then process oilhole fillet at the straight oilhole of main shaft and the straight oilhole of connecting rod with inclined oil hole of air junction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610563510.9A CN105952772A (en) | 2016-07-18 | 2016-07-18 | Crankshaft oil hole structure for improving torsional fatigue strength of crankshaft and processing method |
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| CN201610563510.9A CN105952772A (en) | 2016-07-18 | 2016-07-18 | Crankshaft oil hole structure for improving torsional fatigue strength of crankshaft and processing method |
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| CN105952772A true CN105952772A (en) | 2016-09-21 |
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| CN201610563510.9A Pending CN105952772A (en) | 2016-07-18 | 2016-07-18 | Crankshaft oil hole structure for improving torsional fatigue strength of crankshaft and processing method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107052396A (en) * | 2017-04-14 | 2017-08-18 | 江苏万力机械股份有限公司 | The design method of oilhole angle in mid frequency induction hardening bent axle |
| CN109262206A (en) * | 2018-09-27 | 2019-01-25 | 武汉重工铸锻有限责任公司 | The processing method of high speed crankshaft oil hole |
| CN110740836A (en) * | 2017-06-14 | 2020-01-31 | 阿尔芬·凯斯勒机械制造有限责任公司 | Method and device for work hardening crankshafts |
-
2016
- 2016-07-18 CN CN201610563510.9A patent/CN105952772A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107052396A (en) * | 2017-04-14 | 2017-08-18 | 江苏万力机械股份有限公司 | The design method of oilhole angle in mid frequency induction hardening bent axle |
| CN110740836A (en) * | 2017-06-14 | 2020-01-31 | 阿尔芬·凯斯勒机械制造有限责任公司 | Method and device for work hardening crankshafts |
| CN109262206A (en) * | 2018-09-27 | 2019-01-25 | 武汉重工铸锻有限责任公司 | The processing method of high speed crankshaft oil hole |
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Application publication date: 20160921 |