technical data　linear actuator　Linipower Jack　technical data

Allowable buckling load calculation formula

The allowable buckling load of the jack's screw shaft is calculated using the formula below.

PCR = m× d2 L 2

Make sure that P CR > W×Sf.

P CR: Allowable buckling load N{kgf}

d: Thread root diameter mm (Please refer to Major Specifications page for each product.)

m: Support coefficient (Select the installation condition from the diagram below.)

L: Distance between points of action mm
(Maximum dimensions in the dimension table for each frame number. If End fitting is required, please refer to End fitting dimensions.)

W: Load per jack N{kgf}

Sf: Buckling safety factor (generally 4)

Installation status

ベース固定一軸端フリー
A Fixed base, free shaft end
m
SI units 2.5×104
Gravity Units {2.5×103}
両端クレビス支持
B Clevis support on both ends
m
SI units 10×104
Gravity Units {10×103}
ベース固定一軸端支持/固定
C Fixed base, single shaft end support/fixed
m
SI units 20×104
Gravity Units {20×103}
SI units

When calculating PCR when using JWM100USH5JI with a load of 49,000N and installation condition C (base fixed - shaft end supported/fixed),

  • P CR = 20×10 4 × 38.4 2 791* 2 = 695027N
    W×SF = 49000×4 (Sf = 4)
    = 196000N compared to
    P CR > W × Sf
    695027 > 196000 ... OK

    *L = 711 + 80 (I-shaped End fitting) = 791
    From the product dimensions table
{gravity unit}

When calculating PCR when using JWM100USH5JI with a load of 5000 kgf and installation condition C (base fixed - shaft end supported/fixed),

  • P CR = 20×10 3 × 38.4 2 791* 2 = 69502kgf
    W×SF = 5000×4 (Sf = 4)
    = 20000kgf compared to
    P CR > W × Sf
    69502 > 20000 ... OK

    *L = 711 + 80 (I-shaped End fitting) = 791
    From the product dimensions table
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