The analysis of the force of the spring coil is based on the formula (3), and the formula (4) is substituted into the formula (2) to obtain 2MdUD+PsindU2+(P+dP)sindU2+dPcosdU2f=0(5) because dU is small, take sindU2=dU2, cosdU2= 1, dPsindU2 = 0, then the formula (5) is simplified to dP2MD + P = - fdU (6) set the pressure of any two cross-sections of the spring wire are P1 and P2, respectively, the angle between the two sections is U, the (6) Take the integral QP1P2dP2MD+P=-fQU0dU circle as an open ring. When U=0, P2=0, after integration, P1+2MD=2Me-fUD(7). Because P2=0, effective pull force is obtained. Pf0=P1-P2=P1, P1=Pf0 is substituted into equation (7) and Pf0D2=M(e-fU-1) is the effective torque Tf0=M(e-fU-1)(8) Set spring and active The number of contact turns between the housing and the passive housing is N turns, then U=2PN, and the friction torque when the clutch is over is designed by the formula (8) Tf=M(e-2PNf-1)(9), the clutch transmits The working torque T is a known amount, and the relationship between the bending moment M on the cross section of the spring wire and the clutch operating torque T is M=Te2PNf-1 (10), and the formula (10) is substituted into the formula (9) to obtain Tf=T ( e-2PNf-1)e2PNf-1(11) The overrunning friction torque calculated by equation (11) is a negative value indicating super The frictional moment of the time is opposite to the direction of the friction torque at the working stroke. For the convenience of calculation, it is represented by a positive value, so equation (11) can be rewritten as Tf=T(1-e-2PNf)e2PNf-1(12) (12) is the calculation formula of the friction torque when the expansion type self-excited overrunning spring clutch is over. It can be seen from the formula (12) that the friction torque at the time of overtaking increases as the operating torque transmitted by the clutch increases, and decreases as the friction coefficient increases. Silicate can be used in many industries, it include different kinds of silicate, such as: Potassium Silicate, Potassium Sodium Silicate , Sodium Silicate and so on. Potassium silicate & Potassium sodium silicate with glassy lump and liquid mainly are used for welding industry, also can be used for Agriculture, oil drilling field. Powdery Instant Potassium Silicate is white powdery substance, can fast dissolve in water, resistant to cold and good uniformity. It is a special foamed alkali convenient to be used, transported and stored. Molecular formula: K2O·nSiO2·H2O, n varies with the specification the uses. Powdery Instant Potassium Silicate has better solubility and higher adhension compared with powdery instant sodium silcate and is widely used as adhesive in fireproof material, as auxiliary in drilling liquid of oil field and other special fields. Silicate Potassium Silicate,Potassium Silicate Sodium,Potassium Water Glass,Sodium Silicate SJZ Chenghui chemical co ltd , http://www.chenghuichemicals.com
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In order to obtain the relationship between the bending moment and the frictional moment, take a spring length of dl on the coil, and set the center angle of the micro-spring wire to dU, and the pressure on the left section of the micro-spring wire. For P, the pressure on the right section is P+dP, the bending moment on the two sections is M, the tension of the micro-segment spring wire is dF, the pressure of the outer casing to the micro-segment spring is dN, and the friction between the outer casing and the spring The coefficient is f. When the outer casing rotates in the direction of the spring rotation, the friction torque of the outer casing to the spring coil is Tf0 when the outer casing is over, and the friction force of the outer casing acting on the micro-segment spring wire is fdN, and the micro-section is in the above-mentioned forces. Under the action of the equilibrium state, it can list the equilibrium equation of the force of the micro-segment in the horizontal direction and the vertical direction PcosdU2-fdN-(P+dP)cosdU2=0(1)dF+PsindU2+(P+dP)sindU2-dN =0 (2) dN=-dPcosdU2f (3) is obtained by the formula (1). The negative sign in the equation indicates that the pressure between the housing and the coil is reduced due to the reduction of the coil when overriding. The relationship between the bending moment M and the tension of the spring wire dF is the diameter of the D spring in the formula dF=2MdUD(4).