How to repair and replace crank pin of motorcycle?

Categories:Industry news
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Time of issue:2019-11-28
Views:5

(Summary description)Ontheonehand,thecrankpinconnectstheleftandrightcrankstogether,ontheotherhand,itconnectstheconnectingrodandthecrankshaftthroughthebigendholeoftheconnectingrod.Whentheengineisworking,theforceactingonthecrankpinisverylarge.Asthecrankpinofvarioustypesofvehicleshaslittledifferenceinmaterial,heattreatmentandmachiningaccuracyrequirements,itispossibletorepairandreplaceit.Butwhenconsideringthereplacementofcrankpin,wemustpayattentiontotwopoints:first,thestructuraldimensionofcrankpincanmeettheuserequirementsafterrepair;second,itcanmeetthelubricationrequirementsofengine. Thestructureofcrankpinisdifferentwithdifferentlubricationmethodsofcrankconnectingrodmechanism.Thereareusuallysolidpin,through-corepin,through-holepinandsoon.Theengineadoptsmixedlubricationmodels,suchasdomestic250andothermodels,whosecrankpinsaresolidpins,whichcanbereplacedbythroughpinswithsufficientstrengthduringrepair.Theengineadoptsseparatedlubrication(lubricatingoilismixedwithcombustiblemixtureincarburetor,andthenenterscrankcasetogether),suchasYamahadx100,yb100andothermodels.Thecrankpinismostlythrough-centerpin.Ontheonehand,itcanreduceweightonthebasisofsufficientstrength,ontheotherhand,itisconducivetooilmistcollusioninthecrankshaft,butifsolidpinisusedinstead,theeffectisnottoogreatObvious. Fortheenginemodelswithdirectionallubrication,suchasSuzukiA100,A50,A80,HondaCG125,CD70,etc.,thecrankpinisprovidedwithsmallholesforcirculatinglubricatingoil,soastolubricatethelargeendneedlerollerbearingofconnectingrod.Thiskindofcrankpinmustnotbereplacedbysolidpinorcrankpinwithincorrectoilholeposition. Somecrankpinscanbedirectlyusedinterchangeably,suchasthoseonYamaharx125andSuzuki125motorcycles.Ifnecessary,thecrankpinsonthesetwotypesofmotorcyclescanalsobeusedonXingfu250motorcycles,orthecrankpinsonXingfu250motorcyclescanbeusedonthesetwotypesofmotorcycles. Somecrankpinsoncarscanbeusedassubstitutesafterrepair.Forexample,thecrankpinofXingfu250motorcyclecanbeusedonYamahadx100motorcycleafterbeingshortened.IfthecrankpindiameterofYamahadx100motorcycleisprocessedfrom22mmto20mm,itcanbeusedonHondah100smotorcycle.Afterthediameterisreduced,thehardnessdoesnotdecrease.

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How to repair and replace crank pin of motorcycle?

(Summary description)Ontheonehand,thecrankpinconnectstheleftandrightcrankstogether,ontheotherhand,itconnectstheconnectingrodandthecrankshaftthroughthebigendholeoftheconnectingrod.Whentheengineisworking,theforceactingonthecrankpinisverylarge.Asthecrankpinofvarioustypesofvehicleshaslittledifferenceinmaterial,heattreatmentandmachiningaccuracyrequirements,itispossibletorepairandreplaceit.Butwhenconsideringthereplacementofcrankpin,wemustpayattentiontotwopoints:first,thestructuraldimensionofcrankpincanmeettheuserequirementsafterrepair;second,itcanmeetthelubricationrequirementsofengine. Thestructureofcrankpinisdifferentwithdifferentlubricationmethodsofcrankconnectingrodmechanism.Thereareusuallysolidpin,through-corepin,through-holepinandsoon.Theengineadoptsmixedlubricationmodels,suchasdomestic250andothermodels,whosecrankpinsaresolidpins,whichcanbereplacedbythroughpinswithsufficientstrengthduringrepair.Theengineadoptsseparatedlubrication(lubricatingoilismixedwithcombustiblemixtureincarburetor,andthenenterscrankcasetogether),suchasYamahadx100,yb100andothermodels.Thecrankpinismostlythrough-centerpin.Ontheonehand,itcanreduceweightonthebasisofsufficientstrength,ontheotherhand,itisconducivetooilmistcollusioninthecrankshaft,butifsolidpinisusedinstead,theeffectisnottoogreatObvious. Fortheenginemodelswithdirectionallubrication,suchasSuzukiA100,A50,A80,HondaCG125,CD70,etc.,thecrankpinisprovidedwithsmallholesforcirculatinglubricatingoil,soastolubricatethelargeendneedlerollerbearingofconnectingrod.Thiskindofcrankpinmustnotbereplacedbysolidpinorcrankpinwithincorrectoilholeposition. Somecrankpinscanbedirectlyusedinterchangeably,suchasthoseonYamaharx125andSuzuki125motorcycles.Ifnecessary,thecrankpinsonthesetwotypesofmotorcyclescanalsobeusedonXingfu250motorcycles,orthecrankpinsonXingfu250motorcyclescanbeusedonthesetwotypesofmotorcycles. Somecrankpinsoncarscanbeusedassubstitutesafterrepair.Forexample,thecrankpinofXingfu250motorcyclecanbeusedonYamahadx100motorcycleafterbeingshortened.IfthecrankpindiameterofYamahadx100motorcycleisprocessedfrom22mmto20mm,itcanbeusedonHondah100smotorcycle.Afterthediameterisreduced,thehardnessdoesnotdecrease.

Categories:Industry news
Author:
Origin:
Time of issue:2019-11-28
Views:5

On the one hand, the crank pin connects the left and right cranks together, on the other hand, it connects the connecting rod and the crank shaft through the big end hole of the connecting rod. When the engine is working, the force acting on the crank pin is very large. As the crank pin of various types of vehicles has little difference in material, heat treatment and machining accuracy requirements, it is possible to repair and replace it. But when considering the replacement of crank pin, we must pay attention to two points: first, the structural dimension of crank pin can meet the use requirements after repair; second, it can meet the lubrication requirements of engine.

The structure of crank pin is different with different lubrication methods of crank connecting rod mechanism. There are usually solid pin, through-core pin, through-hole pin and so on. The engine adopts mixed lubrication models, such as domestic 250 and other models, whose crank pins are solid pins, which can be replaced by through pins with sufficient strength during repair. The engine adopts separated lubrication (lubricating oil is mixed with combustible mixture in carburetor, and then enters crankcase together), such as Yamaha dx100, yb100 and other models. The crank pin is mostly through-center pin. On the one hand, it can reduce weight on the basis of sufficient strength, on the other hand, it is conducive to oil mist collusion in the crankshaft, but if solid pin is used instead, the effect is not too great Obvious.

For the engine models with directional lubrication, such as Suzuki A100, A50, A80, Honda CG125, CD70, etc., the crank pin is provided with small holes for circulating lubricating oil, so as to lubricate the large end needle roller bearing of connecting rod. This kind of crank pin must not be replaced by solid pin or crank pin with incorrect oil hole position.

Some crankpins can be directly used interchangeably, such as those on Yamaha rx125 and Suzuki 125 motorcycles. If necessary, the crankpins on these two types of motorcycles can also be used on Xingfu 250 motorcycles, or the crankpins on Xingfu 250 motorcycles can be used on these two types of motorcycles.

Some crank pins on cars can be used as substitutes after repair. For example, the crank pin of Xingfu 250 motorcycle can be used on Yamaha dx100 motorcycle after being shortened. If the crank pin diameter of Yamaha dx100 motorcycle is processed from 22mm to 20mm, it can be used on Honda h100s motorcycle. After the diameter is reduced, the hardness does not decrease.

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