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Worm Gear Screw Jacks

Thomson's worm gear screw jacks MULI® and JUMBO® set new engineering standards for precision and reliability.  Designed with state-of-the-art CAD and CAE systems and adhering to stringent manufacturing requirements, these jacks meet all the necessary safety, cost-efficiency, and durability mandates of your application. 

Large projects can be realized at short notice thanks to the use of preassembled modules.  These modules can be customized to your application's specifications. Above all, the heart of every MULI and JUMBO screw jack is a precision trapezoidal or ball screw drive of superb quality from Thomson's own screw production. In general, there are two worm gear screw jack considerations: 

  • Trapezoidal screw for rough conditions and good price/performance ratio
  • Ball screw for long duty cycle, high efficiency, and high positioning accuracy

Overview

Trapezoidal Screw Specifications:

Trapezoidal Screws MULI 1 MULI 2 MULI 3 MULI 4 MULI 5 JUMBO 1 JUMBO 2 JUMBO 3 JUMBO 4 JUMBO 5
Maximum Lifting Capacity (kN) 5 10 25 50 100 150 200     250      350      500
Screw Diameter and Pitch (mm) 18 x 4 20 x 4 30 x 6 40 x 7 55 x 9 60 x 9 70 x 10   80 x 10   100 x 10  120 x 14
Stroke in mm per
full turn of drive shaft
Ratio H 1 1 1 1 1 1 1       1        1      1
Ratio L 0.25 0.25 0.25 0.25  0.25 0.25 0.25     0.25      0.25    0.25
Gear Ratio Ratio H 4:1 4:1 6:1 7:1 9:1 9:1 10:1     10:1       10:1     14:1 
Ratio L 16:1 16:1 24:1  28:1  36:1 36:1 40:1     40:1       40:1     56:1 
Efficiency (%) Ratio H 31 29 29 26 24 23 22      20       19      19
Ratio L 25 23 23 21 19 18 17      15       15      15
Weight (kg) (zero stroke) 1.20 2.10 6.0 17 32 41 57      57       85     160
Weight (kg per 100 mm stroke) 0.26 0.42  1.14  1.67 3.04 3.10 4.45    6.13      7.90      11.5 
Idling Torque (Nm) Ratio H 0.04 0.11 0.15 0.35 0.84 0.88 1.28    1.32     1.62     1.98
Idling Torque (Nm) Ratio L 0.03 0.10 0.12  0.25 0.51 0.57 0.92    0.97      1.10      1.42 
Housing Material G-AL GGG-40

Ball Screw Specifications:

Ball Screws MULI 1 MULI 2 MULI 3 MULI 4 MULI 5 JUMBO 3
Maximum Lifting Capacity (kN)      5      10    12.5      22     42     65      78
Screw Diameter and Pitch (mm)   16 x 5   20 x 5   25 x 5   40 x 5  40 x 10  50 x 10   80 x 10
Stroke in mm per
full turn of drive shaft
Ratio H    1.25    1.25    0.83    0.71    1.43     1.1        1
Ratio L    0.31    0.31    0.21    0.18     0.36    0.28     0.25
 Gear Ratio Ratio H     4:1     4:1     6:1              7:1      9:1      10:1
Ratio L    16:1    16:1   24:1             28:1     36:1      40:1 
 Efficiency (%) Ratio H     57     56    55     53     56     47      45
Ratio L     46     44    43     43     45     37      34
Weight (kg) (zero stroke)    1.3    2.3      7             19     35      63
Weight (kg per 100 mm stroke)    0.26    0.42    1.14            1.67    3.04     6.13
 Idling Torque (Nm) Ratio H    0.04    0.11   0.15           0.35   0.84    1.32
 Idling Torque (Nm) Ratio L    0.03    0.10    0.12            0.25    0.51     0.97
 Housing Material            G-AL                                 GGG-40 

Worm Gear Screw Jack Features

  • MULI® and JUMBO® series are manufactured for loads from 5 to 500 kN
  • Cubic housing, standardized mounting material and end-pieces, and pre-drilled flange holes permit easy installation of motor, gears, and shaft encoder
  • All models designed for tensile and compressive loads
  • Complete range of motors and accessories is available
  • All models designed for pushing forces, pulling forces, and for position independent  functioning
  • High and low speeds available due to two different ratios
  • Synchronization of several jacks is easily accomplished  

Worm Gear Screw Jack Options

  • Version N- screw rotation prevented by its permanent attachment to guided load
  • Version V- anti-rotation device; recommended when screw cannot be secured externally to prevent rotation
  • Version R- rotatory motion of the screw is translated into linear motion via travelling nut   Note: nut must be purchased separately
  • Gear Ratio H- one full turn of the shaft produces a stroke of 1 mm
  • Gear Ratio L- one full turn of the shaft produces a stroke of 0.25 mm

Selector

CAD Models

  • Configurable 2D/3D Partstream Models
  • Configurable 2D/3D Solidcomponents Models
  • Configurable 2D/3D PartServer Models
  • Static 2D/3D Model file downloads
Worm Gear Screw Jacks (MULI/JUMBO) 2D/3D Interactive Models
Neff TGS - N version (Axial Travel, Ball Screw, Standard)
Neff KGS - N version (Axial Travel, Ball Screw, Standard)
Neff TGS - R version (Axial Travel, Trapezoidal Screw, Anti-rotation)
Neff KGS - R version (Axial Travel, Ball Screw, Anti-rotation)
Neff TGS - V version (Axial Travel, Trapezoidal Screw, Anti-rotation)
Neff KGS - V version (Axial Travel, Ball Screw, Anti-rotation)
PARTS: Neff MULI/JUMBO EFM Trapezoidal Bronze Nut Options
PARTS: Neff KAR Universal Joint Adapter Options
PARTS: Neff KON Flanged Radial Mount Adapter Bracket Options
PARTS: Neff L MULI/JUMBO Burnished Mounting Feet Options
PARTS: Neff KGF-N MULI/JUMBO Flanged Ball Nut Options
PARTS: Neff BP MULI/JUMBO Top Plate Options
PARTS: Neff GK MULI/JUMBO Clevis End Options
PARTS: Neff GA MULI Folk End Options
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