CN1259621A - Uniformly tightening method of diesel engine cylinder cover screw - Google Patents
Uniformly tightening method of diesel engine cylinder cover screw Download PDFInfo
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- CN1259621A CN1259621A CN 99101527 CN99101527A CN1259621A CN 1259621 A CN1259621 A CN 1259621A CN 99101527 CN99101527 CN 99101527 CN 99101527 A CN99101527 A CN 99101527A CN 1259621 A CN1259621 A CN 1259621A
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- cylinder
- cylinder cover
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- diesel engine
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Abstract
A uniformly tightening method for cylinder cover screw of diesel oil engine is characterized in that after uniform force is used to tighten the cylinder cover screw of diesel oil engine, the cylinder cover and pad system pressing mould is set up to make three D limited element rigidity calculation, optimize the tightening degree of each screw and increase tightening force, then according to the tightening degree the tightening force is increased. That is it adopts non-uniform torsional moment pressing method to achieve the aim of uniformly pressing cylinder pad and increse the sealing performance during operation equipment.
Description
The present invention relates to a kind of uniformly tightening method of diesel engine cylinder cover screw, especially a kind of uniformly tightening method of diesel engine cylinder cover screw.
Traditional diesel engine cylinder cover screw all adopts evenly and fastens.Since the nineties, the in-cylinder pressure of highly supercharged diesel engine approaches to 20Mpa, and the gasket seal between cylinder cap and cylinder sleeve must evenly compress and could guarantee sealing.Air cylinder head structure complexity, its rigidity are difficult to realize axisymmetric.Still adopt the screw of arranging with axisymmetric evenly to compress method, must make gasket seal compress inequality, thereby the cylinder cap gas leak phenomenon occur.
The objective of the invention is to overcome the deficiency of above-mentioned prior art and a kind of uniformly tightening method of realizing the diesel engine cylinder cover screw that the cylinder pad evenly compresses is provided.
Purpose of the present invention can reach by following measure, a kind of uniformly tightening method of diesel engine cylinder cover screw, after it is characterized in that the equal power of cylinder cover of diesel screw fastened, set up cylinder cap cylinder mattress system pressure die shape, through the three-dimensional finite element Rigidity Calculation, the tightening force of each screw-driving number of degrees of optimization and increase, then according to tighten the number of degrees and increase to chase after the tightness number system tight, realize evenly fastening of cylinder pad.
Compared with the prior art the present invention has following advantage: owing to taked a kind of uniformly tightening method of diesel engine cylinder cover screw, realized evenly compressing of cylinder pad, increased the sealing of cylinder cap, stopped the cylinder cap gas leak phenomenon
Description of drawings:
Fig. 1 is cylinder cap entity appearance figure,
Fig. 2 is a cylinder cap entity appearance sectional view.
Fig. 3 is screw, pad, accessory plate entity appearance figure.
Fig. 4 is cylinder cap entity and screw, pad, accessory plate assembling appearance figure,
Fig. 5 is the appearance of left-half finite element.
Fig. 6 is the appearance of right half part finite element.
Fig. 7 is a pad external diameter schematic representation,
Fig. 8 is the shift diagram of right half part cylinder pad,
Fig. 9 is a cylinder cap right half part shift diagram, and 1,2,3,4 is screw,
Figure 10 is a cylinder cap left-half shift diagram, and 1,2,3,4 is screw,
Figure 11 is the shift diagram of left-half cylinder pad,
Figure 12 is the vector absolute value deformation pattern of cylinder pad left-half osculating element after " adding stubborn 18 degree, subtract 26 degree, subtract 4 degree, constant " in the screw order.
Figure 13 for twist 26 degree through adding, subtract 24 degree in the screw order, constant, add 8 and spend " after the vector absolute value deformation pattern of cylinder pad right half part osculating element.
Describe the present invention in detail below in conjunction with accompanying drawing:
After solid modelling is finished shown in Fig. 1～4, then carried out the finite element moulding, because cylinder cap is too complicated, can't carry out whole finite element moulding, therefore cylinder cap is divided into left and right sides two-part carries out the finite element moulding, as Fig. 2 is the entity of left-half, Fig. 5, Fig. 6 be about the finite element moulding of half part, cylinder cap is taked tetrahedron element, left-half is 50306 unit, right half part is 61641 unit, and cylinder head material is a spheroidal graphite cast iron, and its elastic modulus E is according to mechanical design handbook E=1.3-1.8 * 10
4It is 1.55 * 10 that kg/mm gets intermediate value
4Kg/mm=1519 * 10
5N/mm, the mild steel copper facing pad between cylinder cap and the cylinder sleeve and the Young's modulus of cylinder adopt the E:2.068 * 10N/mm of common ISO steel, and the unit adopts each 36 unit about the rectangular element pad, each 1478 unit about cylinder liner; Because cylinder liner is suspended on the body, therefore handle as fixing at the boundary conditions of suspension place, the bolt load basis: moment of torsion 110NM chases after tight 90 ° requirement, and the bolt here is the common coarse thread of M24, according to its friction factor of mechanical design handbook is f=0.2, when friction factor is f
v=0.35, table 1 has been listed the pitch t of several V-threads, inner diameter d
2, middle footpath d
1, according to formula tg φ=t/ π d---1. table 1:
1. α is the lift angle of screw thread in the formula, φ
vBe equivalent friction angle.Tg φ during coarse thread
v=0.35 φ
v=19.29004622 ° of screw-down torques:
The 2. middle Q of formula
PBe tightening force, D
OThe pad external diameter as shown in Figure 7.Moment of torsion is M
ωCalculate during=110NM: Q
P=14.05748KN.Bolt rigidity
Here A is the bolt sectional area, and l is a bolt length.So ought chase after tight 90 degree again, when bolt elongates 3/4=0.75mm:
This load is added on each bolt hole center, adopt rigid element to link to each other between Centroid and the hole week cell node, adopt osculating element between cylinder cap and the mild steel packing ring, when calculating each bolt in view of the above and evenly tightening, the distortion of cylinder cap and pad thereof such as Fig. 8, Fig. 9, Figure 10, Figure 11, the displacement here is meant the synthetic of three coordinate figure vectors, Fig. 8, marked start element that packing ring contacts with cylinder cap number among Fig. 9, other surperficial osculating element is pressed the in-line arrangement row, and osculating element amount of deformation vertically lists in table 2, table 3, this shows, the maximum deformation quantity of left-half and the difference of least amount of deformation are 0.01358mm, and mean value is 0.0294mm, and near the modification amount No. 1 bolt is less, illustrate that rigidity herein is bigger, should increase pretightening force.The maximum modification amount of right half part and the difference of minimum variant amount are 0.01209mm, and mean value is 0.02943mm, and by table and figure as seen, near the modification amount No. 1 bolt is less, illustrates that rigidity herein is bigger, should increase pretightening force,
| Tooth form | t(mm) | ????d 1 | ??d 2 | ????tgα | ????α |
| Tooth is thick | ??3 | ?20.752 | ?22.051 | ?0.043305503 | ?2.479673258 |
| Closely-pitched | ??2 | ?21.835 | ?22.701 | ?0.028043688 | ?1.606363973 |
| ??1.5 | ?22.376 | ?23.026 | ?0.0207358998 | ?1.187909306 | |
| ??1 | ?22.917 | ?23.35 | ?0.0136321150 | ?0.784142802 |
Table 2: the axial modification (E-02mm) of packing ring left-half osculating element
Table 3: the axial modification (E-02mm) of right half part packing ring osculating element
Tightening the number of degrees according to result of calculation as Fig. 9, bolt order, increase and decrease shown in Figure 10, the corresponding relation of tightening between angle and pretightening force is as shown in table 4, here L+18-26-4 be expressed as add on the basis of No. 1 bolt shown in Figure 9 90 degree of left-half twist subtract on 18 degree, No. 2 bolt 90 degree bases twist 26 degree promptly 64 degree, subtract for No. 3 and twist 4 degree, do not increase for No. 4 and do not subtract that promptly 90 degree are constant.Table 4:
| Element | ?82665 | ?82666 | ?82667 | ?82668 | ?82669 | ?82670 | ?82671 |
| Axial displacement | -2.639 | -2.591 | -2.821 | -2.744 | -2.915 | -3.041 | -2.819 |
| Element | ?82672 | ?82673 | ?82674 | ?82675 | ?82676 | ?82677 | ?82678 |
| Axial displacement | -2.592 | -2.582 | -2.776 | -3.145 | -3.161 | -3.159 | -3.441 |
| Element | ?82679 | ?82680 | ?82681 | ?82682 | ?82683 | ?82684 | ?82685 |
| Axial displacement | -3.243 | -3.145 | -3.279 | -3.259 | -2.990 | -2.771 | -3.093 |
| Element | ?82686 | ?82686 | ?82688 | ?82689 | ?82690 | ?82691 | ?82692 |
| Axial displacement | -3.051 | -3.069 | -3.282 | -3.258 | -3.343 | -3.220 | -3.173 |
| Element | 82693 | ?82694 | ?82695 | ?82696 | ?82697 | ?82698 | ?82699 |
| Axial displacement | -3.291 | -3.174 | -3.123 | -2.863 | -2.371 | -2.328 | -2.301 |
| Element | ?82700 | ?Average | |||||
| Axial displacement | -2.083 | ?Min | Max | -2.948 |
| ?Element | ?134747 | ?134748 | ?134749 | ?134750 | ?134751 | ?134752 |
| Axial displacement | -2.291 | -2.371 | -2.694 | -2.597 | -2.683 | -3.961 |
| ?Element | ?134753 | ?134754 | ?134755 | ?134756 | ?134757 | ?134758 |
| Axial displacement | -3.082 | -2.763 | -2.689 | -2.779 | -2.881 | ?3.350 |
| ?Element | ?134759 | ?134760 | ?134761 | ?134762 | ?134763 | ?134764 |
| Axial displacement | -3.488 | -3.448 | -3.238 | -3.102 | ?3.2990 | -3.500 |
| ?Element | ?134765 | ?134766 | ?134767 | ?134768 | ?134769 | ?134770 |
| Axial displacement | -3.483 | -3.315 | -3.195 | -3.276 | -3.196 | -2.711 |
| ?Element | ?134771 | ?134772 | ?134773 | ?134774 | ?134775 | ?134776 |
| Axial displacement | -2.647 | -2.993 | -2.998 | -2.898 | -2.761 | -2.734 |
| ?Element | ?134777 | ?134778 | ?134779 | ?134780 | ?134781 | ?134782 |
| Axial displacement | -2.830 | -2.814 | -2.779 | -2.766 | -2.739 | -2.603 |
| ?Element | Average | |||||
| Axial displacement | ??Min | ?Max | -2.943 |
| Twist and subtract the number of degrees | ????2 | ????3 | ????4 | ????5 | ????10 |
| The pretightening force that increases | 5.773124 | ?8.659686 | ?11.54625 | ?14.432813 | ?28.86562 |
| Tighten the number of degrees | ????14 | ????18 | ????20 | ????24 | ????28 |
| What increase subtracts power in advance | 40.411868 | ?51.958116 | ?57.77124 | ?69.277488 | 80.823736 |
Table 5: 18 subtract 26 through increasing, subtract the axial modification (E-0.2mm) of packing ring left-half osculating element behind 4 degree in the bolt order
| Element | ?82665 | ?82666 | ?82667 | ?82668 | ?82669 | ?82670 | ?82671 |
| Axial displacement | -2.548 | -2.515 | -2.738 | -2.626 | -2.760 | -2.898 | -2.661 |
| ?Element | ?82672 | ?82673 | ?82674 | ?82675 | ?82676 | ?82677 | ?82678 |
| Axial displacement | -2.438 | -2.448 | -2.621 | -2.928 | -2.929 | -2.919 | -3.144 |
| ?Element | ?82679 | ?82680 | ?82681 | ?82682 | ?82683 | ?82684 | ?82685 |
| Axial displacement | -2.948 | -2.874 | -3.022 | -3.088 | -2.774 | -2.599 | -2.889 |
| ?Element | ?82686 | ?82686 | ?82688 | ?82689 | ?82690 | ?82691 | ?82692 |
| Axial displacement | -2.799 | -2.836 | -3.080 | -3.116 | -3.276 | -3.234 | -3.244 |
| ?Element | ?82693 | ?82694 | ?82695 | ?82696 | ?82697 | ?82698 | ?82699 |
| Axial displacement | -3.396 | -3.326 | -3.270 | -3.028 | -2.585 | -2.551 | -2.534 |
| ?Element | ?82700 | ?Average | |||||
| Axial displacement | -2.331 | ?Min | ?Max | -2.858 |
Table 6: twist 26 through adding, subtract 24, constant, the axial modification (E-02mm) that adds packing ring right half part osculating element behind 8 degree in the bolt order
| Element | ?134747 | ?134748 | ?134749 | ?134750 | ?134751 | ?134752 |
| Axial displacement | -2.613 | -2.706 | -3.093 | -2.963 | -3.038 | -3.348 |
| Element | ?134753 | ?134754 | ?134755 | ?134756 | ?134757 | ?134758 |
| Axial displacement | -3.496 | -3.071 | -2.925 | -2.964 | -2.993 | -3.429 |
| Element | ?134759 | ?134760 | ?134761 | ?134762 | ?134763 | ?134764 |
| Axial displacement | -3.532 | ?-3.464 | -3.224 | -3.079 | -3.264 | -3.437 |
| Element | ?134765 | ?134766 | ?134767 | ?134768 | ?134769 | ?134770 |
| Axial displacement | -3.409 | -3.244 | -3.135 | -3.218 | -3.141 | -2.673 |
| Element | ?134771 | ?134772 | ?134773 | ?134774 | ?134775 | ?134776 |
| Axial displacement | -2.620 | -2.968 | -2.984 | -2.904 | -2.784 | -2.771 |
| Element | ?134777 | ?134778 | ?134779 | ?134780 | ?134781 | ?134782 |
| Axial displacement | -2.888 | -2.879 | -2.847 | -2.835 | -2.802 | -2.658 |
| Element | ?Average | |||||
| Axial displacement | ??Min | ?Max | -3.038 |
This shows that after adjusting pretightening force by above-mentioned measure, the modification amount maximum value of left-half and the difference of minimum value are 0.01065mm, do not reduce 0.00293mm before adjusting pretightening force, are 78.42% of initial value; Mean value is that the modification amount maximum value of 0.02858mm. right half part and the difference of minimum value are 0.00919mm, does not reduce 0.0029 before adjusting pretightening force, is 76.01% of initial value; Mean value is 0.03038mm.The two-part mean value in the left and right sides remains basically stable, and increases 0.000025mm than the mean value that does not increase after pretightening force increases.
Claims (1)
- The uniformly tightening method of 1 one kinds of diesel engine cylinder cover screws, after it is characterized in that the equal power of the cylinder cover screw of diesel engine fastened, set up cylinder cap cylinder mattress system pressure die shape, through the three-dimensional finite element Rigidity Calculation, the tightening force of each screw-driving number of degrees of optimization and increase, then according to tighten the number of degrees and increase to chase after the tightness number system tight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99101527 CN1259621A (en) | 1999-01-05 | 1999-01-05 | Uniformly tightening method of diesel engine cylinder cover screw |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99101527 CN1259621A (en) | 1999-01-05 | 1999-01-05 | Uniformly tightening method of diesel engine cylinder cover screw |
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| Publication Number | Publication Date |
|---|---|
| CN1259621A true CN1259621A (en) | 2000-07-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 99101527 Pending CN1259621A (en) | 1999-01-05 | 1999-01-05 | Uniformly tightening method of diesel engine cylinder cover screw |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1259621A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103034744A (en) * | 2011-10-08 | 2013-04-10 | 唐文献 | Simulation method of temperature field of cylinder head of low-speed diesel engine |
-
1999
- 1999-01-05 CN CN 99101527 patent/CN1259621A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103034744A (en) * | 2011-10-08 | 2013-04-10 | 唐文献 | Simulation method of temperature field of cylinder head of low-speed diesel engine |
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