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

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
Stroke in mm per full turn of drive shaft	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
Gear Ratio	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
Efficiency (%)	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
Stroke in mm per full turn of drive shaft	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
Gear Ratio	Ratio L	16:1	16:1	24:1	28:1		36:1	40:1
Efficiency (%)	Ratio H	57	56	55	53	56	47	45
Efficiency (%)	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