Technical Data 　Linear actuator 　Linipower Jack Selection

Conditions required for selection

Machine to be used ..... Table or theatre lifter, conveyer line selector etc.

Layout ..... Patterns of multiple jack systems (4, 6 or more units), driving, coupling etc.

Maximum load (W) ..... Load or work weight 　N{kgf}

Screw Shaft Speed (V) ..... Required speed for jack 　m/min

Stroke ..... Actual stroke used 　mm

Screw type ..... Ball screw type (JWB)、High lead ball screw type (JWH)、Trapezoidal screw type (JWM)

Mounting style ..... Standard model (Lift or suspend, with or without rotation prevention )、Travel Nut Type (For lifting orFor suspending )

Installation Conditions ..... Fixed base, shaft end clevis, etc. ・For compression loads, consider buckling.

Expected life ..... Years jack will withstand (for JWB, JWH only )

Selection procedure

1. Calculation of adjusted Load Ws

Calculate the adjusted Load Ws by determining the service factor (Table 1) for specific load characteristic.

Adjusted Load Ws (N{kgf}) = Maximum load W (N{kgf})×Service factor Sf

Table 1 Service factor Sf

Load characteristics Usage examples Service factor
Smooth operation without impact
Small load inertia 		Opening/closing a valve
Adjusting a conveyor 		1.0～1.3
Operation with light impact
Medium load inertia 		Transfer systems
Various kinds of lifters 		1.3～1.5
Operation with large impact/vibration
Large load inertia 		Large transporting carriages, Holding the position of a press roller 1.5～3.0

Note) The above operation factor table shows general guidelines, and please apply the appropriate factor depending on actual condition.

2. Load per jack

Calculate load W per jack, by using the adjusted load Ws obtained above. For a synchronous drive, use a multiple factor (Table 2).

Load / jack W (N{kgf}) = Adjusted Load Ws (N{kgf}) No. of jacks ×Multiple factor fd

Table 2 Multiple factor fd

Number of multiple units ( units ) 2 3 4 5～8
Multiple factor 0.95 0.9 0.85 0.8

3. Jack Selection

Follow these steps to make a preliminary jack selection.

Points of preliminary jack selection

  • 1.Select (temporary) worm speed ratio by adjusting the screw shaft speed. If difficult to select, examine by H speed.
  • 2.Select a stroke for the jack with an extra margin with respect to the operating stroke.
  • 3.Select options based on your needs.

4. Verifying Buckling and Screw Shaft Speed

  • 1.Allowable Buckling Load
    For a compressive load, verify that it does not exceed the allowable buckling load. (Click here )
    If it exceeds the allowable value, increase jack size and recalculate.
  • 2.Allowable screw shaft speed
    If using a travel nut, verify that it does not exceed the allowable shaft speed. (Click here )
    If it exceeds the allowable value, increase jack size and recalculate.

5. Confirming Required Input speed

Determine the required input speed, using the required screw shaft speed.

N = V ℓ ×R

N：Input speed r/min

V：Screw Shaft Speed m/min

ℓ：Screw lead m

R：Worm Reduction Ratio

6. Verifying Required Input Torque

Calculate required input torque.

T = W×ℓ 2×π×R×η + To

T：Necessary input torque 　N・m{kgf･m}

W：Lift load 　N{kgf}

ℓ：Screw lead 　m

π：Pi (circular ratio) 　3.14

R：Worm Reduction Ratio

η：Jack overall efficiency

To：Idling torque without load 　N・m{kgf･m}

  • Note)
    For screw lead, gear ratio, overall efficiency and no-load idle torque, see the major specifications page for each product.
    Pay attention to the unit of screw lead. Example) 8mm → 0.008m

7. Verifying Input Capacity

SI Unit 　P = T×N 9550

Gravity unit 　P = T×N 974

T：Necessary input torque 　N・m{kgf･m}

P：Required input capacity 　kW

N：Input speed 　r/min

8. Allowable Overhang Load

When installing a sprocket, gear, or belt to the input shaft, confirm that any overhang load applied to the shaft decreases to the allowable OHL or less. (Click here )

If it exceeds the allowable value, increase jack size and recalculate.

9. Life check (JWB/JWH only )

Check if wear life is sufficient. (Click here )

When increasing travel distance, increase jack size and recalculate.

※Life cannot be calculated for JWM (trapezoidal screw) type.

10. Selecting Your Options

Select options that best suit your needs.

  • ・Output Option ・Installation Option
  • ・Position Sensor Option ・Input Option
  • ・Accessory Option

(Refer to drawing library for each product )

11. Determining the jack body model number

Determine the actual Linipower Jack number that meets the above conditions.

Parts Options

Motor

Determine the required drive unit capacity for synchronous drive Pt value.

1. Overall Torque Tt

Add the torque required for each jack T1 to 4 on the drive unit side to determine the overall Torque Tt.

[Required Torque per Jack ]

T1～4 = T (Gearbox efficiency ) No. of gearbox

[Required Torque for the Drive Unit ]

Tt = T1 + T2 + T3 + T4

T1～4：Required torque for each jack on the drive unit side 　N・m{kgf･m}

T：Required input torque per jack 　N・m{kgf・m}

Gearbox efficiency ：Assume 0.9

Tt：Required Torque for the Drive Unit 　N・m{kgf・m}

For a four unit system (Figure 1), T1 to 4 = T0.92.

Fig. 1

4 unit system

2. Verifying allowable input shaft torque

Be certain that the required input torque calculated is within the allowable input shaft torque.

Example)
If jacks are arranged in a linear structure as shown in Fig. 2, the drive unit input shaft transfers the total input torque required for both jacks.
This doubled torque should not exceed the allowable input torque.

Fig. 2

Verifying allowable input shaft torque

Required input torque for Jack A TA

Required input torque for Jack B TB

Required torque at the motor Tt = TA + TB < Allowable Torque on Input Shaft

3. Determine the required drive unit capacity Pt

Determine Pt with input speed N and overall Torque Tt calculated at the above 1.

SI Unit 　Pt = Tt×N 9550

Gravity unit 　Pt = Tt×N 974

Pt：Total required torque at the drive unit 　kW

Tt：Required Torque for the Drive Unit 　N・m{kgf･m}

N：Input speed for the jack 　r/min

Selection of other equipment

Gear Box

Select based on input speed and allowable torque.

Please refer to the Tsubaki Miter Gear Box single catalog.

Coupling

Select based on allowable torque and maximum shaft diameter.

Please refer to the Tsubaki coupling single catalog.

Selection example of Linipower Jack

Example ：

Four jack synchronous drive for lifting (see layout below), operating at room temperature under low dust conditions.

Guide installed on the equipment to prevent side load, fixed base-Guided shaft end/Fixed shaft end, with 3-phase 220v/60Hz motor.

Operation cycle : (2 times/hour) X (8 hours/day) X (300 days/year) X (3 years usage)

  • (1)Maximum load ：98.0kN{10tf}/4 cylinders
  • (2)Required speed ：5mm/s(0.3m/min)
  • (3)Operating stroke ：260mm

Four Jack Drive System

Four Jack Drive System

※See above for T1-4

SI Unit
  • 1. Adjusted load Ws is (service factor Sf=1.3)

    Ws = 98000×1.3 = 127400N

  • 2. Load W per jack is
    W = 127400 4×0.85 = 37470N
  • 3. Considering speed, efficiency and drive unit, JWB050USH is preliminarily selected.
  • 4. For 260mm operating stroke, use 300 mm stroke for the jack. Considering its possible dust generation and Guided shaft end/Fixed shaft end (see layout above), the appropriate jack would be JWB050USH3JM.
  • 5. Since this load is compressive, calculate the operated buckling load based on the graph (click here) and the formula (click here). (Assume service factor Sf=4 ) Click here for details on calculations.
    PCR = 20×104 × 31.32 637(*From the product dimension table ) 2 = 473073N
    Sf = 473073 37470 > 4 ... OK
  • 6. This is not a travel nut type so there is no need to confirm allowable screw shaft speed.
    (Inspect the allowable screw shaft speed if using a travel nut. )
  • 7. Required Input Capacity P is
    (1)N = 0.30 0.010 ×6 = 180r/min
    (2)T = 37470×0.010 2×3.14×6×0.64 + 1.37 = 16.9N・m
    From (1)(2) P = 16.9×180 9550 = 0.32kW

    JWB050USH3の最大許容入力容量は2.2kWですので、P = 0.32kW < 2.2kW
    (If not suitable, increase the frame number or reduce the screw shaft speed and recalculate. )

  • 8. Overhang load does not apply so inspection is not required.
    (If overhang load is applied, consider allowable overhang load )
  • 9. Verifying Wear Life for JWB

    Calculate the expected travel distance from usage frequency (Click here )

    Expected traveling distance = 0.26×2×8×300×10-3×3＝3.74km

    We then find that the suitable jack number is JWB050.
    ...OK

  • 10. Jack Options

    Possible dust ---> With Bellows

    Shaft end (End fitting ) ----> With table type end fitting

    Finally, we conclude by selecting JWB050USH3JM.

{Gravity unit }
  • 1. Adjusted load Ws is (service factor Sf=1.3)

    Ws = 10000×1.3 = 13000kgf

  • 2. Load W per jack is
    W = 13000 4×0.85 = 3824kgf
  • 3. Considering speed, efficiency and drive unit, JWB050USH is preliminarily selected.
  • 4. For 260mm operating stroke, use 300 mm stroke for the jack. Considering its possible dust generation and Guided shaft end/Fixed shaft end (see layout above), the appropriate jack would be JWB050USH3JM.
  • 5. Since this load is compressive, calculate the operated buckling load based on the graph (click here) and the formula (click here). (Assume service factor Sf=4 ) Click here for details on calculations.
    PCR = 20×103 × 31.32 637(*From the product dimension table ) 2 = 47307kgf
    Sf = 47307 3824 > 4 ... OK
  • 6. This is not a travel nut type so there is no need to confirm allowable screw shaft speed.
    (Inspect the allowable screw shaft speed if using a travel nut. )
  • 7. Required Input Capacity P is
    (1)N = 0.30 0.010 ×6 = 180r/min
    (2)T = 3824×0.010 2×3.14×6×0.64 + 0.14 = 1.73kgf・m
    From (1)(2) P = 1.73×180 974 = 0.32kW

    JWB050USH3の最大許容入力容量は2.2kWですので、P = 0.32kW < 2.2kW
    (If not suitable, increase the frame number or reduce the screw shaft speed and recalculate. )

  • 8. Overhang load does not apply so inspection is not required.
    (If overhang load is applied, consider allowable overhang load )
  • 9. Verifying Wear Life for JWB

    Calculate the expected travel distance from usage frequency (Click here )

    Expected traveling distance = 0.26×2×8×300×10-3×3＝3.74km

    We then find that the suitable jack number is JWB050.
    ...OK

  • 10. Jack Options

    Possible dust ---> With Bellows

    Shaft end (End fitting ) ----> With table type end fitting

    Finally, we conclude by selecting JWB050USH3JM.

Selecting Parts

A. Selecting a Drive Unit

1. Required torque for each jack on the drive unit side T1(2.3.4)

SI Unit   T1 = 16.9 0.92 = 20.9N・m
Gravity unit  T1 = 1.57 0.92 = 2.13kgf・m

Since 4 jacks follow the same route,

SI Unit   Tt = T1×4 = 83.5N・m

Gravity unit  Tt = T1×4 = 8.52kgf・m

2. Inspecting the Rated Input Torque

In this case, inspection is not necessary because 2 or more jacks are not arranged in a linear structure.

3. Total required torque at the drive unit Pt

SI Unit   Pt = 83.5×180 9550 = 1.57kW
Gravity unit  Pt = 8.52×180 974 = 1.57kW

From the input speed 180r/min,

1800 180 = 10

Based on this data we select GMTR220-42L10B, TSUBAKI 2.2kW gearmotor with a brake unit.
Please refer to the Tsubaki compact gearmotor catalog for details.

B.1.Select a gear box based on the required input torque of 15.4N・m{1.57kgf・m}, and input speed of 180r/min.

1-1.Gear box on each side of the jack must tolerate the combined torque of 2 jacks.
20.9×2 0.9 = 46.4N・m  2.13×2 0.9 = 5.11kgf・m
Thus we selected gear box ED4M.

(Make sure the direction of the gear box shaft rotation is correct. )

1-2.Gearbox by the gear motor required torque for 4 jacks.
20.9×4 0.92 = 103N・m  2.13×4 0.92 = 8.69kgf・m
From this, we find that the gear box ED6M is most suitable

Gear box by the jack

  • Left side ：ED4M 1-LR-O-Y
  • Right side ：ED4M 1-LR-Y

Gear box by the gearmotor

  • ED6M 1-LR-Y

(Please refer to Tsubaki Miter Gear Box Catalog for details. )

B.2.Select couplings based on your requirements.
(Please refer to the Tsubaki coupling catalog for details. )

The following is an example process for selecting the right couplings.

2-1Select couplings used between each jack and their adjacent gear box based on the required input torque per jack, 16.9N・m {1.73kg・fm}, input shaft diameter (Φ20 for JWB050USH), and the gear box shaft diameter (Φ19 for ED4M).

Required number is 2×2×2=8.

2-2Select couplings used between the gear boxes based on the required torque for the nearest pair of jacks,

20.9×2 0.9 = 50.1N・m  2.13×2 0.9 = 5.11kgf・m

and the diameter of each gear box shaft: one by the jack (Φ19 for ED4M), and the other by the gearmotor (Φ25 for ED6M).

Required number is 2×2＝4.

2-3Select couplings used between each gear box and the gearmotor based on the total required torque for the four jacks,

20.9×4 0.92 = 85.2N・m  2.13×4 0.92 = 8.69kgf・m

and the diameters of the gearbox (Φ25 for ED6M) and the gear motor output shafts (Φ42 for GMTR220-42L10B). Required number is 2.

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