CN102926832B - SUV automobile two VVT overhead camshaft engine timing chain and making method - Google Patents
SUV automobile two VVT overhead camshaft engine timing chain and making method Download PDFInfo
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Abstract
The present invention relates to a kind of SUV automobile two VVT overhead camshaft engine timing chain and making method, when motor Maximum Power Output 103KW, Maximum Torque 180N.m, the highest crankshaft sprocket rotating speed 6000rpm, camshaft clamping torque 28N.m, (1) timing chain tensile strength >=10KN, circumferential tension≤1650N; In timing system drive chain the arc diameters that are outer, inner plate two end part of outer link and inner link be 7.6max, outer link and inner link carrier bar on be respectively equipped with two chain pin axis holes and pitch-row be respectively 8mm, inner link two inner plates between interior distance be 4.6min.Advantage: one is meet timing chain tensile strength >=10KN, circumferential tension≤1650N requirement; Two is that bearing pin adopts 75 material surface chromising enhancement process, and tensile strength reaches 11-12KN, can meet the demand of the two VVT motor car engine of high-power, high moment of torsion SUV+ completely; Four is that roller to adopt after cold-heading+the pre-heat treatment+tempering mode of quenching, and effectively eliminates circumferential crack stress and concentrates, improve impact resistance.
Description
Technical field
The present invention relates to that a kind of Seamless Steel Tube appears that assembling, bearing pin tensile strength reach 11-12KN, roller adopt cold-heading after+the pre-heat treatment+tempering mode of quenching, effectively can eliminate circumferential crack stress to concentrate, improve SUV automobile two VVT overhead camshaft engine timing chain and the making method of chain impact resistance, belong to auto parts and components and manufacture 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 formula: h corresponding timing chain indent 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 above formula, the radius r of the side circular arc of timing chain and guide rail contact, the i.e. radius of curvature of circular arc type guide rail, the following formula of basis of this radius: rn=(An/2)/sin (α n/2), in 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: one is roll sleeve and inner plate flattens, bearing pin adopts 30CrMnTi material Carburization Treatment, and tensile strength is low, is only 7.9-8.2KN; Two is that to roll roller poor in seam crossing circularity, increases under free state with impact force during sprocket engagement, easily chipping; Three be punching rod for chamfered transition, easily produce cut (degree of depth large likely change formation of crack into) to workpiece and degree of symmetry is bad, roller has obvious ring-shaped step; Four is tear easily produce area of stress concentration with part itself after perforation, and after heat treatment, distortion is cracked afterwards; Five be punching rod for chamfered transition, easily produce cut (degree of depth large likely change formation of crack into) to workpiece and degree of symmetry is bad, roller has obvious ring-shaped step; Five is tear easily produce area of stress concentration with part itself after perforation, and after heat treatment, distortion is cracked afterwards; Six is because undershoot rod coaxality form tolerance control upper during cold-heading is not good, separately rushing stick end is straight chamfered transition, the roller that cold-heading goes out has a circle ring-shaped step rushing bottom surface, it is alternatively formation of crack, after heat treatment stress is concentrated, fatigue strength reduces, and bears the complex working condition of the incessantly many impacts of Automotive Engine Chain roller high speed variable load.
Summary of the invention
Purpose of design: avoid the deficiency in background technique, design that a kind of Seamless Steel Tube appears that assembling, bearing pin tensile strength reach 11-12KN, roller adopt cold-heading after+the pre-heat treatment+tempering mode of quenching, effectively can eliminate circumferential crack stress to concentrate, improve SUV automobile two VVT overhead camshaft engine timing chain and the making method of chain impact resistance.
Design proposal: in order to realize above-mentioned purpose of design.1, SUV automobile to be appeared assembling with two VVT overhead camshaft engine timing chain Seamless Steel Tube, and bearing pin adopts the design of 75 material surface chromising enhancement process, is one of technical characteristics of the present invention.The object done like this is: it can improve the tensile strength of bearing pin effectively, makes the tensile strength of bearing pin reach 11-12KN, meets the demand of the two VVT motor car engine of high-power, high moment of torsion SUV+ completely.2, the design of roller cold-upsetting technique+the pre-heat treatment+tempering process of quenching is technical characteristics two of the present invention.The object done like this is: effectively eliminate roller circumferential crack stress and concentrate, improve impact resistance.3, the strict accuracy of manufacturing controlling punching rod, and change its end into arc transition, and after cold-heading, increase the anti-station squeezed, effectively remove ring-shaped step, avoid the generation in source, crack.4, carbonitriding is quenched the selection of tempering process parameters, is technical characteristics four of the present invention.The object done like this is: adopt 850 degree of quenchings, 180 degree of low-temperature temperings, its surface is made to define the hardened layer with 0.10-0.13mm, this hardened layer surface hardness 610-625HV, heart portion reach 470-480HV, make its heart portion have higher hardness support, fundamentally avoid insufficient strength and cause cracked.
Technological scheme 1: the two VVT overhead camshaft engine timing chain 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, (1) timing chain tensile strength >=10KN, circumferential tension≤1650N; In timing system drive chain the arc diameters that are outer, inner plate two end part of outer link and inner link be 7.6max, outer link and inner link carrier bar on be respectively equipped with two chain pin axis holes and pitch-row be respectively 8mm, inner link two inner plates between interior distance be 4.6min.
Technological scheme 2: the two VVT overhead camshaft engine timing chain making method of a kind of SUV automobile, the roller making method in described timing system drive chain is as follows: (1) draw materials: the 42CRrMo getting Φ 5.9mm, cuts 3.05mm thick; (2) thick upsetting: in roughcast by the thick upsetting of 42CRrMo of thick 3.05mm, Φ 5.9mm be thick 3mm, on Φ 6.21mm, Φ 4mm in the middle part of surrounding arc limit, bottom; (3) smart upsetting: in smart mould by roller material essence upsetting after thick upsetting be thick 3.03mm, on Φ 6.29mm, Φ 4mm in the middle part of surrounding arc limit, bottom; (4) stretch: the roller material after smart upsetting being stretched as external diameter in stretching die is Φ 6.32mm, internal diameter Φ 4.83mm, high 5.65mm+0 or 0.05; (5) length shaping: the roller material after stretching is carried out shaping, the external diameter Φ 6.35mm of the roller material after shaping, high 5.62mm-0 or 0.1 in sizing die; (6) bore a hole: obtain roller; (7) inner hole refined squeezes: employing mould squeezes the roller essence after perforation, and the roller outer diameter after essence is crowded 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; (8) stress relief annealing: 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 stove cooling; (9) roll burr: 80-150Kg roller part is placed in 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 with 150-200r/mim, 8-12mim during dehydration; (10) carbonitriding is quenched tempering: adopt 850 degree of quenchings, 180 degree of low-temperature temperings, make its surface have the hardened layer of 0.10-0.13mm, surface hardness 610-625HV, heart portion 470-480HV, and heart portion has hardness and supports; (11) roll bright: after tempering of carbonitriding being quenched, 80-150Kg roller part is placed in anistree cylinder, then add 0.5Kg soda ash, 0.5Kg spaonin powder, add water and make the water surface exceed part 3-4cm, index drum rotating speed 55-60r/mim, cleaning 60 hours; (12) rough polishing: bright rear 4-5Kg roller part will be rolled and be placed in ion lapping machine, and then add 0.2-0.3Kg brightening agent, adding water makes the water surface exceed part 3-7cm, adds Φ 5mm high aluminium ceramic, index drum rotating speed 130-140r/mim, polishing 63mim; (13) essence is thrown: 4-5Kg roller part after rough polishing is placed in ion lapping machine, then adds 0.2-0.3Kg brightening agent, and adding water makes the water surface exceed part 3-8cm, adds Φ 2mm high aluminium ceramic, index drum rotating speed 130-140r/mim, polishing 64mim.
The present invention is compared with background technique, one is at maximum power 103KW, Maximum Torque 180N.m, the highest crankshaft sprocket rotating speed 6000rpm, during camshaft clamping torque 28N.m, the application meets timing chain tensile strength >=10KN, circumferential tension≤1650N requirement; Two is adopt Seamless Steel Tube to appear assembling, and bearing pin adopts 75 material surface chromising enhancement process, and tensile strength reaches 11-12KN, can meet the demand of high-power, high moment of torsion SUV+ pair of VVT motor car engine completely; Three is that roller to adopt after cold-heading+the pre-heat treatment+tempering mode of quenching, and effectively eliminates circumferential crack stress and concentrates, improve impact resistance; Four is that the precision that punching rod manufactures strictly controls, and changes its end into arc transition, increases the anti-station squeezed, effectively remove the generation of ring-shaped step after cold-heading.
Accompanying drawing explanation
Fig. 1 is the block diagram of SUV automobile by two VVT overhead camshaft engine timing chain making method.
Fig. 2 is the main TV structure schematic diagram 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 chain 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, (1) timing chain tensile strength >=10KN, circumferential tension≤1650N; In timing system drive chain the arc diameters that are outer, inner plate two end part of outer link and inner link be 7.6max, outer link and inner link carrier bar on be respectively equipped with two chain pin axis holes and pitch-row be respectively 8mm, inner link two inner plates between interior distance be 4.6min.The two end portions Magnification that described chain hinge pin stretches out outer link outer plate is not less than 3% respectively and diameter is 3.14min after increasing; Its extension length is 0.85min; Its augmenting portion periphery is angular type and inclined-plane on end face and horizontal plane angle 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 described timing system chain, surface hardness 610-625HV, heart portion 470-480HV.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 method of a kind of SUV automobile, the roller making method in described timing system drive chain is as follows: (1) draw materials: the 42CRrMo getting Φ 5.9mm, cuts 3.05mm thick; (2) thick upsetting: in roughcast by the thick upsetting of 42CRrMo of thick 3.05mm, Φ 5.9mm be thick 3mm, on Φ 6.21mm, Φ 4mm in the middle part of surrounding arc limit, bottom; (3) smart upsetting: in smart mould by roller material essence upsetting after thick upsetting be thick 3.03mm, on Φ 6.29mm, Φ 4mm in the middle part of surrounding arc limit, bottom; (4) stretch: the roller material after smart upsetting being stretched as external diameter in stretching die is Φ 6.32mm, internal diameter Φ 4.83mm, high 5.65mm+0 or 0.05; (5) length shaping: the roller material after stretching is carried out shaping, the external diameter Φ 6.35mm of the roller material after shaping, high 5.62mm-0 or 0.1 in sizing die; (6) bore a hole: obtain roller; (7) inner hole refined squeezes: employing mould squeezes the roller essence after perforation, and the roller outer diameter after essence is crowded 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; (8) stress relief annealing: 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 stove cooling; (9) roll burr: 80-150Kg roller part is placed in 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 with 150-200r/mim, 8-12mim during dehydration; (10) carbonitriding is quenched tempering: adopt 850 degree of quenchings, 180 degree of low-temperature temperings, make its surface have the hardened layer of 0.10-0.13mm, surface hardness 610-625HV, heart portion 470-480HV, and heart portion has hardness and supports; (11) roll bright: after tempering of carbonitriding being quenched, 80-150Kg roller part is placed in anistree cylinder, then add 0.5Kg soda ash, 0.5Kg spaonin powder, add water and make the water surface exceed part 3-4cm, index drum rotating speed 55-60r/mim, cleaning 60 hours; (12) rough polishing: bright rear 4-5Kg roller part will be rolled and be placed in ion lapping machine, and then add 0.2-0.3Kg brightening agent, adding water makes the water surface exceed part 3-7cm, adds Φ 5mm high aluminium ceramic, index drum rotating speed 130-140r/mim, polishing 63mim; (13) essence is thrown: 4-5Kg roller part after rough polishing is placed in ion lapping machine, then adds 0.2-0.3Kg brightening agent, and adding water makes the water surface exceed part 3-8cm, adds Φ 2mm high aluminium ceramic, index drum rotating speed 130-140r/mim, polishing 64mim.
The circularity that Seamless Steel Tube can eliminate seam crossing is completely poor, and during chain operation, circularity difference will increase extra impact vector to roller, strengthens the shock-resistant ability of roller, and has obvious reduction to chain noise; 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 eliminate cold-heading stress, the rate of expansion in circumferential crack source of slowing down, and effectively improves roller impact resistance.
It is to be understood that: although above-described embodiment to be contrasted detailed text description to mentality of designing of the present invention; but these text descriptions; just the simple text of mentality of designing of the present invention is described; instead of the restriction to mentality of designing of the present invention; any do not exceed mentality of designing of the present invention combination, increase or amendment, all fall within the scope of protection of the present invention.
Claims (6)
1. the two VVT overhead camshaft engine timing system drive chain of SUV automobile, is characterized in that: when motor Maximum Power Output 103KW, Maximum Torque 180N.m, the highest crankshaft sprocket rotating speed 6000rpm, camshaft clamping torque 28N.m,
(1) timing system drive chain tensile strength >=10KN, circumferential tension≤1650N;
In timing system drive chain the arc diameter maximum values that are outer, inner plate two end part of outer link and inner link be 7.6mm, outer link and inner link carrier bar on be respectively equipped with two chain pin axis holes and pitch-row be respectively 8mm, inner link two inner plates between interior apart from minimum value be 4.6mm.
2. the two VVT overhead camshaft engine timing system drive chain of SUV automobile according to claim 1, is characterized in that: the two end portions Magnification that described chain hinge pin stretches out outer link outer plate is not less than 3% respectively and minimum diameter is 3.14mm after increasing; Its extension length minimum value is 0.85mm; Its augmenting portion periphery is angular type and inclined-plane on end face and horizontal plane angle are 25 degree.
3. the two VVT overhead camshaft engine timing system drive chain of SUV automobile according to claim 1, is characterized in that: the extrusion pressure of the outer plate of described chain hinge pin and outer link is 500N.
4. the two VVT overhead camshaft engine timing system drive chain of SUV automobile according to claim 1, is characterized in that: chain hinge pin adopts 75 material surface chromising enhancement process, and tensile strength is 11-12KN.
5. the two VVT overhead camshaft engine timing system drive chain of SUV automobile according to claim 1, is characterized in that: the hardened layer of roller 0.10-0.13mm in described timing system drive chain, surface hardness 610-625HV, heart portion 470-480HV.
6. the two VVT overhead camshaft engine timing system drive chain making method of SUV automobile as claimed in claim 1, is characterized in that the roller making method in described timing system drive chain is as follows:
(1) draw materials: the 42CrMo getting Φ 5.9mm, cut 3.05mm thick;
(2) thick upsetting: in roughcast by the thick upsetting of 42CrMo of thick 3.05mm, Φ 5.9mm be thick 3mm, on Φ 6.21mm, Φ 4mm in the middle part of surrounding arc limit, bottom;
(3) smart upsetting: in smart mould by roller material essence upsetting after thick upsetting be thick 3.03mm, on Φ 6.29mm, Φ 4mm in the middle part of surrounding arc limit, bottom;
(4) stretch: the roller material after smart upsetting being stretched as external diameter in stretching die is Φ 6.32mm, internal diameter Φ 4.83mm, high 5.65mm+0 or 0.05;
(5) length shaping: the roller material after stretching is carried out shaping, the external diameter Φ 6.35mm of the roller material after shaping, high 5.62mm-0 or 0.1 in sizing die;
(6) bore a hole: obtain roller;
(7) inner hole refined squeezes: employing mould squeezes the roller essence after perforation, and the roller outer diameter after essence is crowded 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;
(8) stress relief annealing: 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 stove cooling;
(9) roll burr: 80-150Kg roller part is placed in 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/min, cleaning 2-3 hour, then dewater with 150-200r/min, 8-12min during dehydration;
(10) carbonitriding is quenched tempering: adopt 850 degree of quenchings, 180 degree of low-temperature temperings, make its surface have the hardened layer of 0.10-0.13mm, surface hardness 610-625HV, heart portion 470-480HV, and heart portion has hardness and supports;
(11) roll bright: after tempering of carbonitriding being quenched, 80-150Kg roller part is placed in anistree cylinder, then add 0.5Kg soda ash, 0.5Kg spaonin powder, add water and make the water surface exceed part 3-4cm, index drum rotating speed 55-60r/min, cleaning 60 hours;
(12) rough polishing: bright rear 4-5Kg roller part will be rolled and be placed in ion lapping machine, and then add 0.2-0.3Kg brightening agent, adding water makes the water surface exceed part 3-7cm, adds Φ 5mm high aluminium ceramic, index drum rotating speed 130-140r/min, polishing 63min;
(13) essence is thrown: 4-5Kg roller part after rough polishing is placed in ion lapping machine, then adds 0.2-0.3Kg brightening agent, and adding water makes the water surface exceed part 3-8cm, adds Φ 2mm high aluminium ceramic, index drum rotating speed 130-140r/min, polishing 64min.
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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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Families Citing this family (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 |
| 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 |
| CN115637404A (en) * | 2022-11-16 | 2023-01-24 | 杭州东华链条集团有限公司 | Pin shaft machining process and chain |
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| CN201843654U (en) * | 2010-11-15 | 2011-05-25 | 杭州顺峰链业有限公司 | Automobile timing chain |
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| CN202991163U (en) * | 2012-11-16 | 2013-06-12 | 杭州顺峰链业有限公司 | Timing chain of double variable valve timing (VVT) overhead camshaft engine for sport utility vehicle (SUV) |
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| JPS5716147A (en) * | 1980-06-30 | 1982-01-27 | Mitsubishi Metal Corp | Sintered oil-containing roller chain bush |
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| GB859387A (en) * | 1957-12-10 | 1961-01-25 | Renold Chains Ltd | Improvements in or relating to chains |
| CN201843654U (en) * | 2010-11-15 | 2011-05-25 | 杭州顺峰链业有限公司 | Automobile timing chain |
| CN201991999U (en) * | 2010-11-15 | 2011-09-28 | 杭州顺峰链业有限公司 | Oil pump chain of automobile engine |
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Effective date of registration: 20161226 Address after: 311121 Haishu Road, Yuhang District, Zhejiang, No. 12 Hangzhou Road Patentee after: HANGZHOU SFR TECHNOLOGY CO., LTD. Address before: Hangzhou City, Zhejiang province Yuhang District 311121 Haishu changqian Road No. 12 Patentee before: Hangzhou Sunfun Chain Co., Ltd. |