Cov hniav Z
Kauv bevel iav
Kauv bevel iav
Kaw gear kis feem ntau muaj kev ceev dua. Txhawm rau txhim kho kev ruaj ntseg ntawm kev sib kis thiab txo qhov cuam tshuam thiab kev co, nws yog qhov zoo dua kom muaj cov hniav ntau dua. Tus naj npawb ntawm cov hniav ntawm tus pinion tuaj yeem yog z1=2040. Qhib (ib nrab-qhib) iav kis tau tus mob, vim tias cov hniav iav feem ntau yog hnav, txhawm rau tiv thaiv lub iav los ntawm me me, ntau cov hniav yuav tsum tsis txhob siv rau pinion, feem ntau z{{2} }.
Helix lub kaum sab xis
β>0 sab laug-xa;
<0 is="">
Cov hniav
pn=ptcos (cov ntawv sau npe n thiab t sawv cev rau cov cim ntawm kev coj ua ib txwm muaj thiab lub ntsej muag kawg raws li)
Modulus
The modulus refers to the ratio of the pitch p between the two adjacent teeth on the same side tooth profile to the circumference ratio π (m=p/π), in millimeters. Modulus is one of the most basic parameters of modulus gear teeth. The modulus of straight, helical and conical gears can all refer to the standard modulus series table (GB/T 1357-1987).
mn{0}}mtcos
m=p/ π
The index circle of the gear is the basis for designing and calculating the size of each part of the gear, and the circumference of the index circle of the gear=πd=z p
Modulus m yog ib qho tseem ceeb parameter uas txiav txim siab qhov loj ntawm lub iav. Lub iav nrog tib tus naj npawb ntawm cov hniav muaj qhov loj dua, thiab nws qhov loj me kuj loj dua.
siab lub kaum sab xis
rb=rcos =1/2mzcos
At the tangent point P of the pitch circles of the two gears, the acute angle between the common normal line of the two tooth profile curves (ie the force direction of the tooth profile) and the common tangent line of the two pitch circles (ie the instantaneous direction of motion at point P) is called The pressure angle is also called the engagement angle. For a single gear, it is the tooth profile angle. The pressure angle of a standard gear is generally 20". In some occasions, =14.5 degree , 15 degree , 22.50 degree , and 25 degree are also used.
Txoj kab uas hla ntawm lub voj voog index
d=mz
Center nrug
a=1/2m(z1 plus z2)
Kho meshing tej yam kev mob
m1=m2, 1= 2, 1= 2
In order to prevent the gear from undercutting, for the standard straight-edge cylindrical gear with =20o, z1 Greater than or equal to 17 should be taken. Z2=u·z1.
Ntxiv qhov siab coefficient thiab lub taub hau clearance coefficient
—Ha, C
Thaum ob lub iav meshed, tus hniav ntxeev ntawm ib lub iav ib txwm nkag mus rau hauv cov hniav hauv paus ntawm lwm lub iav. Txhawm rau tiv thaiv thermal expansion los ntawm topping thiab kom muaj qhov chaw rau lubricating roj, qhov siab ntawm cov hniav hauv paus hniav yuav tsum siab tshaj qhov siab ntawm cov hniav. Vim li no, qhov addendum qhov siab coefficient thiab lub taub hau clearance coefficient tau qhia.
Cov hniav ib txwm: ha =1; C=0.25 Tus hniav luv: ha =0.8; C=0.3
