Screw jacks makishinko ja, jah, jas and jta series

Technical Information

JA series standard screw jacks (trapezoidal screw)

This safe design includes a self-locking feature. Models designed for a variety of applications have been standardized to a capacity of 2 kN to 1250 kN.

Features

This series includes a self-locking feature through the use of a trapezoidal screw making it possible to hold the screw shaft even if there is an unintended power cut off.
Grease lubrication is used for the worm reduction section in the range from 2 kN to 10 kN and oil bath lubrication is used for capacities of 25 kN or more. This design is sufficiently rigorous even for high-speed operation.
An ideal bearing structure produces high performance. The standard capacity covers a rich range from 2 kN to 1250 kN.
Makishinko has experience manufacturing up to a capacity of 2000 kN.

Structure

[JA002 to JA010]

Screw shaft end
High precision, large screw shaft
Ideal bearing structure
High precision worm wheel
Large input shaft
Screw shaft guide
Grease lubrication
Light weight housing
High efficiency reduction

[JA025 to JA1250]
*Only significant differences with the JA002 to JA010 models are explained.

Ideal bearing structure
Oil bath lubrication
Tough housing
End cap

JAH series hi-lead screw jacks (trapezoidal screw)

Hi-lead specification jacks are high-speed jacks with a larger screw lead.

Features

Enjoy high-speed operation. (Velocity is two times greater than the JA Series.)
When operated at the same speed as a standard JA Series jack, the JAH Series produces less noise because it can be operated at a lower input speed.
The JAH Series is more efficient than the JA Series (30% or more). Because the screw lead is large, there is not a self-locking effect.
Standardization is available from 25 kN to 200 kN.

JAH Series basic specifications

Model			002	005	010	025	050	075	100	150	200
Nominal capacity (kN)			2	5	10	25	50	75	100	150	200
Screw shaft diameter (mm)			14	22	25	30	40	50	55	60	65
Screw shaft root diameter (mm)			11	17.5	19.5	23.5	31.5	39.5	42.5	47.5	52.5
Screw lead (mm)			12	16	20	12	16	20	24	24	24
Reduction ratio	H		6	6	6	7.67	7.67	7.67	7.67	7.67	7.67
Reduction ratio	L					23	23	23	23	23	23
Traveling distance per one input shaft rotation	H		2.00	2.66	3.33	1.56	2.09	2.61	3.13	3.13	3.13
Traveling distance per one input shaft rotation	L (mm/rev)					0.52	0.70	0.87	1.04	1.04	1.04
Efficiency (%)	H	(30rpm)	32	30	32	31	31	31	34	32	30
	H	(1800rpm)	38	36	39	39	39	39	42	40	38
	L	(30rpm)				20	20	20	23	21	20
	L	(1800rpm)				32	32	32	36	34	33
Max input speed (rpm)			1800	1800	1800	1800	1800	1800	1800	1800	1800
Standard stroke (mm)			Stroke 50-500 (interval 50), more than 500-1000 (interval 100)
Screw torque (N･m)			6.4	22.6	54.4	110	293	550	837	1320	1846
Input no load torque (N･m)			0.14	0.15	0.2	0.5	0.8	1.2	1.8	2.5	2.5
Input starting torque	H (N･m)		2.4	8.1	18.3	22.7	61.2	115.6	167.1	264.6	367.5
Input starting torque	L (N･m)					13.0	35.2	67.0	92.8	148.1	205.2
Reversing load (kN)			2	5	10	25	50	75	100	150	200
Load at rest (kN)			3	8	15	30	60	80	140	170	250
Weight (kg)			2	2.5	3.5	20	25	35	55	65	80

Note:

1. The weight is an estimated value for a stroke of 300 mm.
2. Screw torque, input starting torque and holding torque are the values at nominal capacity.

JAS Series stainless steel screw jacks (Trapezoidal screw)

Specification/Model			025	050	075	100
Nominal capacity (kN)			25	50	75	100
Screw shaft diameter (mm)			30	40	50	55
Screw shaft root diameter (mm)			23．5	31．5	39．5	42．5
Screw pitch (mm)			6	8	10	12
Reduction ratio	H		7．67	7．67	7．67	7．67
Reduction ratio	L		23	23	23	23
Traveling distance per one input shaft rotation	H (mm/rev)		0．78	1．04	1．30	1．56
Traveling distance per one input shaft rotation	L (mm/rev)		0．26	0．35	0．43	0．52
Efficiency (%)	H	(30rpm)	21	21	21	23
	H	(600rpm)	25	25	25	27
	L	(30rpm)	14	13	13	15
	L	(600rpm)	18	18	19	21
Standard stroke (mm)			Stroke of 50 to 500 (50 mm intervals), 500 to 1000 (100 mm intervals)
Screw torque (N･m)			85	230	425	635
Input no load torque (N･m)			0．5	0．8	1．2	1．8
Input starting torque	H (N･m)		10．4	23．2	46．4	62．0
Input starting torque	L (N･m)		25．0	13．6	27．2	34．9
Reversing load (kN)			25	50	75	100
Load at rest (kN)			30	50	75	100
Weight (kg)			20	25	35	55

Note:

1. The weight is an estimated value for a stroke of 300 mm.
2. Screw torque, input starting torque and holding torque are the values at nominal capacity.

JTA Series traveling nut screw jacks (trapezoidal screw)

Features

The operation of the traveling nut minimizes the necessary space for installation in the axial direction.

Structure

[The explanation of the structure is for models 025 to 1250.]

High precision, large screw shaft
Ideal bearing structure
High precision worm wheel
Traveling nut
Large input shaft
High efficiency reduction
Tough housing
Oil bath lubrication