CN102926832A - Timing chain of double VVT overhead camshaft engine for SUV and fabrication method - Google Patents
Timing chain of double VVT overhead camshaft engine for SUV and fabrication method Download PDFInfo
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- CN102926832A CN102926832A CN2012104603418A CN201210460341A CN102926832A CN 102926832 A CN102926832 A CN 102926832A CN 2012104603418 A CN2012104603418 A CN 2012104603418A CN 201210460341 A CN201210460341 A CN 201210460341A CN 102926832 A CN102926832 A CN 102926832A
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Abstract
The invention relates to a timing chain of a double VVT (variable valve timing) overhead camshaft engine for an SUV (sports utility vehicle) and a fabrication method. When the maximum output power of the engine is 103kW, the maximum torque of the engine is 180N.m, the maximum crankshaft sprocket speed is 6000rpm, and the compacting moment of a camshaft is 28N.m, (1) the tensile strength of the timing chain is greater than or equal to 10kN and the circumferential tension is less than or equal to 1650N; (2) arc diameters of two ends of outer and inner chain plates of outer and inner chain links in a transmission chain of a timing system is 7.6max; two chain pin shaft holes with 8mm of a pitch are formed on each of the chain plates of the outer and inner chain links; the distance between every two holes is 8mm; and the internal distance between the two chain plates of the inner chain link is 4.6min. The method has the advantages that: firstly, the requirements that the tensile strength of the timing chain is greater than or equal to 10kN and the circumferential tension is less than or equal to 1650N are met; secondly, the pin shafts adopt 75 material and the surfaces of the pin shafts are strengthened by chroming; the tensile strength reaches 11-12kN; the requirements of the high-power and high-torque SUV and double VVT vehicle engine are met; thirdly, rollers are subjected to cold heading, thermal pretreatment ,quenching and tempering; the stress concentration of circumferential cracks is eliminated effectively; and the impact resistance is improved.
Description
Technical field
The present invention relates to a kind of Seamless Steel Tube appear assembling, bearing pin tensile strength reach 11-12KN, roller and adopt cold-heading after+the pre-heat treatment+tempering mode of quenching, can effectively eliminate circumferential crack stress concentrates, improve the SUV automobile of chain impact resistance with two VVT overhead camshaft engine timing chains and making method, belong to auto parts and components and make the field.
Background technique
CN102312690A, title " design method of V-type automobile engine timing chain system ", the following formula of basis of timing chain indent sag value: hn=rn[1-cos (α n/2)], in the formula: the corresponding timing chain indent of h sag value; The radius of curvature of r timing chain and the side circular arc of corresponding guide rail contact; The radian of α timing chain and the side circular arc of corresponding guide rail contact.In the following formula, the radius r of the side circular arc that timing chain contacts with guide rail, be the radius of curvature of circular arc type guide rail, the following formula of the basis of this radius: rn=(An/2)/sin (α n/2) is in the formula: the radius of curvature of r timing chain and the side circular arc of corresponding guide rail contact; The profound length of A timing chain and the side circular arc of corresponding guide rail contact; The radian of α timing chain and the side circular arc of corresponding guide rail contact.Its deficiency: the one, roll sleeve and inner plate and flatten, bearing pin adopts 30CrMnTi material Carburization Treatment, and tensile strength is low, only is 7.9-8.2KN; The 2nd, it is relatively poor in seam crossing circularity to roll roller, under the free state during with sprocket engagement impact force increase, easily chipping; The 3rd, punching rod is the chamfering transition, and easily bad to workpiece generation cut (degree of depth large might change formation of crack into) and degree of symmetry, roller has obvious ring-shaped step; The 4th, tear easy generation area of stress concentration with part itself after the perforation, distortion is afterwards cracked after the heat treatment; The 5th, punching rod is the chamfering transition, and easily bad to workpiece generation cut (degree of depth large might change formation of crack into) and degree of symmetry, roller has obvious ring-shaped step; The 5th, tear easy generation area of stress concentration with part itself after the perforation, distortion is afterwards cracked after the heat treatment; The 6th, upper undershoot rod coaxality form tolerance control is not good during owing to cold-heading, other rushes stick end is straight chamfering transition, the roller that cold-heading goes out has a ring shape step rushing the bottom surface, also can be described as formation of crack, after heat treatment stress is concentrated, fatigue strength reduces, and bears the incessantly Automotive Engine Chain roller high speed variable load complex working conditions that impact more.
Summary of the invention
Purpose of design: avoid the deficiency in the background technique, design a kind of Seamless Steel Tube appear assembling, bearing pin tensile strength reach 11-12KN, roller and adopt cold-heading after+the pre-heat treatment+tempering mode of quenching, can effectively eliminate circumferential crack stress and concentrate, improve SUV automobile two VVT overhead camshaft engine timing chains and the making method of chain impact resistance.
Design proposal: in order to realize above-mentioned purpose of design.1, the SUV automobile is with the assembling of appearing of two VVT overhead camshaft engine timing chain Seamless Steel Tubes, and bearing pin adopts the design of 75 material surface chromising enhancement process, is one of technical characteristics of the present invention.The purpose of doing like this is: it can improve the tensile strength of bearing pin effectively, makes the tensile strength of bearing pin reach 11-12KN, satisfies the demand of the two VVT motor car engines of high-power, high moment of torsion SUV+ fully.2, the design of the roller cold-upsetting technique+the pre-heat treatment+tempering process of quenching is two of technical characteristics of the present invention.The purpose of doing like this is: effectively eliminate roller circumferential crack stress is concentrated, and improves impact resistance.3, excellent accuracy of manufacturing is rushed in strict control, and changes its end into arc transition, and increases the anti-station that squeezes after cold-heading, effectively removes ring-shaped step, has avoided the generation in source, crack.4, the carbonitriding selection of tempering process parameters of quenching is four of technical characteristics of the present invention.The purpose of doing like this is: adopt 850 degree to quench, 180 degree low-temperature temperings, make its surface form the hardened layer with 0.10-0.13mm, this hardened layer surface hardness 610-625HV, heart section reach 470-480HV, make its heart section have higher hardness and support, fundamentally avoid insufficient strength and cause cracked.
Technological scheme 1: the two VVT overhead camshaft engine timing chains of a kind of SUV automobile, when motor Maximum Power Output 103KW, Maximum Torque 180N.m, the highest crankshaft sprocket rotating speed 6000rpm, camshaft clamping torque 28N.m, ⑴ timing chain tensile strength 〉=10KN, circumferential tension≤1650N; ⑵ the interior distance that is respectively equipped with on the carrier bar that the arc diameters outer, the inner plate two end part of outer link and inner link are 7.6max, outer link and inner link in the timing system drive chain between two inner plates that two chain pin axis holes and pitch-row be respectively 8mm, inner link is 4.6min.
Technological scheme 2: the two VVT overhead camshaft engine timing chain making methods of a kind of SUV automobile, the roller making method in the described timing system drive chain is as follows: ⑴ draws materials: get the 42CRrMo of Φ 5.9mm, it is thick to cut 3.05mm; ⑵ thick upsetting: in roughcast with the thick upsetting of 42CRrMo of thick 3.05mm, Φ 5.9mm be thick 3mm, on middle part, arc limit Φ 4mm around the Φ 6.21mm, bottom; ⑶ smart upsetting: in smart mould with the smart upsetting of roller material after the thick upsetting be thick 3.03mm, on middle part, arc limit Φ 4mm around the Φ 6.29mm, bottom; ⑷ stretch: in stretching die the roller material after the smart upsetting being stretched as external diameter is Φ 6.32mm, internal diameter Φ 4.83mm, high 5.65mm+0 or 0.05; ⑸ length shaping: the roller material after will stretching carries out shaping in sizing die, external diameter Φ 6.35mm, the high 5.62mm-0 or 0.1 of the roller material after the shaping; ⑹ perforation: get roller; ⑺ inner hole refined squeezes: the roller after adopting mould to perforation is smart to be squeezed, and the roller outer diameter after smart the squeezing is Φ 6.35mm-0 or 0.05, internal diameter Φ 4.77mm+0.08 or 0.03, high 5.62mm+0 or 0.15; ⑻ stress relief annealing: the roller part is positioned over pit-type furnace, is warming up to 580-600 degree and steamed stuffed bun good seal performance, closes pit-type furnace, comes out of the stove with the stove cooling; ⑼ roll burr: 80-150Kg roller part places anistree cylinder, then add 10-15Kg silica sand, 0.5Kg washing agent, add water and make the water surface exceed part 3-4cm, index drum rotating speed 55-60r/mim, cleaning 2-3 hour, then dewater 8-12mim during dehydration with 150-200r/mim; ⑽ the carbonitriding tempering of quenching: adopt 850 degree to quench, 180 degree low-temperature temperings make its surface have the hardened layer of 0.10-0.13mm, surface hardness 610-625HV, and the 470-480HV of heart section, heart section has hardness and supports; ⑾ roll bright: carbonitriding is quenched, and 80-150Kg roller part places anistree cylinder after the tempering, then adds 0.5Kg soda ash, 0.5Kg spaonin powder, adds water and makes the water surface exceed part 3-4cm, index drum rotating speed 55-60r/mim, cleans 60 hours; ⑿ rough polishing: will roll bright rear 4-5Kg roller part and place the ion lapping machine, and then add the 0.2-0.3Kg brightening agent, and add water and make the water surface exceed part 3-7cm, add Φ 5mm high aluminium ceramic, index drum rotating speed 130-140r/mim, polishing 63mim; ⒀ smart throws: 4-5Kg roller part after the rough polishing is placed the ion lapping machine, then add the 0.2-0.3Kg brightening agent, add water and make the water surface exceed part 3-8cm, add Φ 2mm high aluminium ceramic, index drum rotating speed 130-140r/mim, polishing 64mim.
The present invention compares with background technique, the one, at maximum power 103KW, Maximum Torque 180N.m, the highest crankshaft sprocket rotating speed 6000rpm, during camshaft clamping torque 28N.m, the application has satisfied timing chain tensile strength 〉=10KN, circumferential tension≤1650N requirement; The 2nd, adopt the Seamless Steel Tube assembling of appearing, bearing pin adopts 75 material surface chromising enhancement process, and tensile strength reaches 11-12KN, can satisfy the demand of high-power, high moment of torsion SUV+ pair of VVT motor car engines fully; The 3rd, after the roller employing cold-heading+the pre-heat treatment+tempering mode of quenching, effectively eliminate circumferential crack stress and concentrate, improve impact resistance; The 4th, the precision that the punching rod is made is strictly controlled, and changes its end into arc transition, increases the anti-station that squeezes after cold-heading, the generation of effectively removing ring-shaped step.
Description of drawings
Fig. 1 is the block diagram that the SUV automobile is used two VVT overhead camshaft engine timing chain making methods.
Fig. 2 is the main TV structure schematic representation of timing chain.
Fig. 3 is that structural representation cuts open in the office of overlooking of timing chain.
Embodiment
Embodiment 1: with reference to accompanying drawing 2 and 3.The two VVT overhead camshaft engine timing chains of a kind of SUV automobile, when motor Maximum Power Output 103KW, Maximum Torque 180N.m, the highest crankshaft sprocket rotating speed 6000rpm, camshaft clamping torque 28N.m, ⑴ timing chain tensile strength 〉=10KN, circumferential tension≤1650N; ⑵ the interior distance that is respectively equipped with on the carrier bar that the arc diameters outer, the inner plate two end part of outer link and inner link are 7.6max, outer link and inner link in the timing system drive chain between two inner plates that two chain pin axis holes and pitch-row be respectively 8mm, inner link is 4.6min.The two end portions Magnification that described chain hinge pin stretches out the outer link outer plate be not less than respectively 3% and increase after diameter be 3.14min; Its extension length is 0.85min; Inclined-plane and horizontal plane angle that its augmenting portion periphery is on angular type and the end face are 25 degree.The extrusion pressure of the outer plate of described chain hinge pin and outer link is 500N; The extrusion pressure of the inner plate of described sleeve and inner link is 800N.Described bearing pin adopts 75 material surface chromising enhancement process, and tensile strength is 11-12KN.The hardened layer of roller 0.10-0.13mm in the described timing system chain, surface hardness 610-625HV, the 470-480HV of heart section.Described timing system chain tensile strength, i.e. Breaking load 〉=10KN, safety coefficient n=
=6.25.
Embodiment 2: with reference to accompanying drawing 1.The two VVT overhead camshaft engine timing chain making methods of a kind of SUV automobile, the roller making method in the described timing system drive chain is as follows: ⑴ draws materials: get the 42CRrMo of Φ 5.9mm, it is thick to cut 3.05mm; ⑵ thick upsetting: in roughcast with the thick upsetting of 42CRrMo of thick 3.05mm, Φ 5.9mm be thick 3mm, on middle part, arc limit Φ 4mm around the Φ 6.21mm, bottom; ⑶ smart upsetting: in smart mould with the smart upsetting of roller material after the thick upsetting be thick 3.03mm, on middle part, arc limit Φ 4mm around the Φ 6.29mm, bottom; ⑷ stretch: in stretching die the roller material after the smart upsetting being stretched as external diameter is Φ 6.32mm, internal diameter Φ 4.83mm, high 5.65mm+0 or 0.05; ⑸ length shaping: the roller material after will stretching carries out shaping in sizing die, external diameter Φ 6.35mm, the high 5.62mm-0 or 0.1 of the roller material after the shaping; ⑹ perforation: get roller; ⑺ inner hole refined squeezes: the roller after adopting mould to perforation is smart to be squeezed, and the roller outer diameter after smart the squeezing is Φ 6.35mm-0 or 0.05, internal diameter Φ 4.77mm+0.08 or 0.03, high 5.62mm+0 or 0.15; ⑻ stress relief annealing: the roller part is positioned over pit-type furnace, is warming up to 580-600 degree and steamed stuffed bun good seal performance, closes pit-type furnace, comes out of the stove with the stove cooling; ⑼ roll burr: 80-150Kg roller part places anistree cylinder, then add 10-15Kg silica sand, 0.5Kg washing agent, add water and make the water surface exceed part 3-4cm, index drum rotating speed 55-60r/mim, cleaning 2-3 hour, then dewater 8-12mim during dehydration with 150-200r/mim; ⑽ the carbonitriding tempering of quenching: adopt 850 degree to quench, 180 degree low-temperature temperings make its surface have the hardened layer of 0.10-0.13mm, surface hardness 610-625HV, and the 470-480HV of heart section, heart section has hardness and supports; ⑾ roll bright: carbonitriding is quenched, and 80-150Kg roller part places anistree cylinder after the tempering, then adds 0.5Kg soda ash, 0.5Kg spaonin powder, adds water and makes the water surface exceed part 3-4cm, index drum rotating speed 55-60r/mim, cleans 60 hours; ⑿ rough polishing: will roll bright rear 4-5Kg roller part and place the ion lapping machine, and then add the 0.2-0.3Kg brightening agent, and add water and make the water surface exceed part 3-7cm, add Φ 5mm high aluminium ceramic, index drum rotating speed 130-140r/mim, polishing 63mim; ⒀ smart throws: 4-5Kg roller part after the rough polishing is placed the ion lapping machine, then add the 0.2-0.3Kg brightening agent, add water and make the water surface exceed part 3-8cm, add Φ 2mm high aluminium ceramic, index drum rotating speed 130-140r/mim, polishing 64mim.
It is poor that Seamless Steel Tube can be eliminated the circularity of seam crossing fully, and circularity is poor during chain operation will increase extra impact vector to roller, strengthens the shock-resistant ability of roller, and the chain noise is had obvious reduction; Sleeve is appeared and can be strengthened the joint fastness of inner link, and improves whole chain lubrication ability, improves the life-span; The pre-heat treatment of roller can be eliminated cold-heading stress, the rate of expansion in the circumferential crack source of slowing down, Effective Raise roller impact resistance.
What need to understand is: although above-described embodiment is to the mentality of designing of the present invention detailed text description of contrasting; but these text descriptions; just the simple text of mentality of designing of the present invention is described; rather than to the restriction of mentality of designing of the present invention; any combination, increase or modification that does not exceed mentality of designing of the present invention all falls within the scope of protection of the present invention.
Claims (7)
1. a SUV automobile is characterized in that with two VVT overhead camshaft engine timing chains: when motor Maximum Power Output 103KW, Maximum Torque 180N.m, the highest crankshaft sprocket rotating speed 6000rpm, camshaft clamping torque 28N.m,
⑴ timing chain tensile strength 〉=10KN, circumferential tension≤1650N;
⑵ the interior distance that is respectively equipped with on the carrier bar that the arc diameters outer, the inner plate two end part of outer link and inner link are 7.6max, outer link and inner link in the timing system drive chain between two inner plates that two chain pin axis holes and pitch-row be respectively 8mm, inner link is 4.6min.
2. SUV automobile according to claim 1 is characterized in that with two VVT overhead camshaft engine timing chains: the two end portions Magnification that described chain hinge pin stretches out the outer link outer plate be not less than respectively 3% and increase after diameter be 3.14min; Its extension length is 0.85min; Inclined-plane and horizontal plane angle that its augmenting portion periphery is on angular type and the end face are 25 degree.
3. SUV automobile according to claim 1 is with two VVT overhead camshaft engine timing chains, and it is characterized in that: the extrusion pressure of the outer plate of described chain hinge pin and outer link is 500N; The extrusion pressure of the inner plate of described sleeve and inner link is 800N.
4. SUV automobile according to claim 1 is with two VVT overhead camshaft engine timing chains, and it is characterized in that: bearing pin adopts 75 material surface chromising enhancement process, and tensile strength is 11-12KN.
5. SUV automobile according to claim 1 is characterized in that: the hardened layer of roller 0.10-0.13mm in the described timing system chain, surface hardness 610-625HV, the 470-480HV of heart section with two VVT overhead camshaft engine timing chains.
6. SUV automobile according to claim 1 is characterized in that with two VVT overhead camshaft engine timing chains: described timing system chain tensile strength, i.e. Breaking load 〉=10KN, safety coefficient n=
=6.25.
7. a SUV automobile is characterized in that the roller making method in the described timing system drive chain is as follows with two VVT overhead camshaft engine timing chain making methods:
⑴ draw materials: get the 42CRrMo of Φ 5.9mm, it is thick to cut 3.05mm;
⑵ thick upsetting: in roughcast with the thick upsetting of 42CRrMo of thick 3.05mm, Φ 5.9mm be thick 3mm, on middle part, arc limit Φ 4mm around the Φ 6.21mm, bottom;
⑶ smart upsetting: in smart mould with the smart upsetting of roller material after the thick upsetting be thick 3.03mm, on middle part, arc limit Φ 4mm around the Φ 6.29mm, bottom;
⑷ stretch: in stretching die the roller material after the smart upsetting being stretched as external diameter is Φ 6.32mm, internal diameter Φ 4.83mm, high 5.65mm+0 or 0.05;
⑸ length shaping: the roller material after will stretching carries out shaping in sizing die, external diameter Φ 6.35mm, the high 5.62mm-0 or 0.1 of the roller material after the shaping;
⑹ perforation: get roller;
⑺ inner hole refined squeezes: the roller after adopting mould to perforation is smart to be squeezed, and the roller outer diameter after smart the squeezing is Φ 6.35mm-0 or 0.05, internal diameter Φ 4.77mm+0.08 or 0.03, high 5.62mm+0 or 0.15;
⑻ stress relief annealing: the roller part is positioned over pit-type furnace, is warming up to 580-600 degree and steamed stuffed bun good seal performance, closes pit-type furnace, comes out of the stove with the stove cooling;
⑼ roll burr: 80-150Kg roller part places anistree cylinder, then add 10-15Kg silica sand, 0.5Kg washing agent, add water and make the water surface exceed part 3-4cm, index drum rotating speed 55-60r/mim, cleaning 2-3 hour, then dewater 8-12mim during dehydration with 150-200r/mim;
⑽ the carbonitriding tempering of quenching: adopt 850 degree to quench, 180 degree low-temperature temperings make its surface have the hardened layer of 0.10-0.13mm, surface hardness 610-625HV, and the 470-480HV of heart section, heart section has hardness and supports;
⑾ roll bright: carbonitriding is quenched, and 80-150Kg roller part places anistree cylinder after the tempering, then adds 0.5Kg soda ash, 0.5Kg spaonin powder, adds water and makes the water surface exceed part 3-4cm, index drum rotating speed 55-60r/mim, cleans 60 hours;
⑿ rough polishing: will roll bright rear 4-5Kg roller part and place the ion lapping machine, and then add the 0.2-0.3Kg brightening agent, and add water and make the water surface exceed part 3-7cm, add Φ 5mm high aluminium ceramic, index drum rotating speed 130-140r/mim, polishing 63mim;
⒀ smart throws: 4-5Kg roller part after the rough polishing is placed the ion lapping machine, then add the 0.2-0.3Kg brightening agent, add water and make the water surface exceed part 3-8cm, add Φ 2mm high aluminium ceramic, index drum rotating speed 130-140r/mim, polishing 64mim.
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| CN201210460341.8A CN102926832B (en) | 2012-11-16 | 2012-11-16 | SUV automobile two VVT overhead camshaft engine timing chain and making method |
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|---|---|---|---|
| CN201210460341.8A CN102926832B (en) | 2012-11-16 | 2012-11-16 | SUV automobile two VVT overhead camshaft engine timing chain and making method |
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| CN102926832B CN102926832B (en) | 2016-01-13 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104368746A (en) * | 2014-11-19 | 2015-02-25 | 杭州持正科技有限公司 | Chain part progressive die secondary blanking technology |
| CN104565210A (en) * | 2014-12-25 | 2015-04-29 | 杭州持正科技有限公司 | Chromizing chain pin shaft and manufacturing method |
| CN104564967A (en) * | 2014-12-25 | 2015-04-29 | 杭州持正科技有限公司 | Chromizing timing chain for engine |
| CN105369192A (en) * | 2015-10-15 | 2016-03-02 | 青岛征和工业股份有限公司 | Method for lowering wear elongation ratio of tooth-shaped chain of engine |
| CN105382175A (en) * | 2014-09-03 | 2016-03-09 | 浙江诸暨建设链条制造有限公司 | Machining technology of chains |
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| GB859387A (en) * | 1957-12-10 | 1961-01-25 | Renold Chains Ltd | Improvements in or relating to chains |
| JPS5716147A (en) * | 1980-06-30 | 1982-01-27 | Mitsubishi Metal Corp | Sintered oil-containing roller chain bush |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105382175A (en) * | 2014-09-03 | 2016-03-09 | 浙江诸暨建设链条制造有限公司 | Machining technology of chains |
| CN104368746A (en) * | 2014-11-19 | 2015-02-25 | 杭州持正科技有限公司 | Chain part progressive die secondary blanking technology |
| CN104565210A (en) * | 2014-12-25 | 2015-04-29 | 杭州持正科技有限公司 | Chromizing chain pin shaft and manufacturing method |
| CN104564967A (en) * | 2014-12-25 | 2015-04-29 | 杭州持正科技有限公司 | Chromizing timing chain for engine |
| CN105369192A (en) * | 2015-10-15 | 2016-03-02 | 青岛征和工业股份有限公司 | Method for lowering wear elongation ratio of tooth-shaped chain of engine |
| CN105369192B (en) * | 2015-10-15 | 2018-11-16 | 青岛征和工业股份有限公司 | A method of reducing engine toothed chain wear elongation ratio |
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|---|---|
| CN102926832B (en) | 2016-01-13 |
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