Screw Jackes (trapezoidal screws) / JA, JTA, JAS, JAH models / Introduction of standard model, Travelling nut models


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JA, JAH, JAS and JTA series screw jacks (trapezoidal screw)

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

Select from a rich variety of fitting configurations.

High precision, large screw shaft

This series uses a trapezoidal screw.

Ideal bearing structure

This series uses a tapered roller bearing that is durable against both thrust and radial loads.
*002 Deep groove ball bearings used

High precision worm wheel

This series uses a special aluminum bronze material which has been machined with high precision and offers ample strength.

Large input shaft

This series offers ample strength for the use of multiple connected jacks.

Screw shaft guide

A screw guide is provided on the output shaft cover of the worm wheel to minimize drift of the screw.

Grease lubrication

Grease lubrication offers easy maintenance.

Light weight housing

The housing is manufactured from diecast aluminum and is both lightweight and compact.

High efficiency reduction

This design offers the benefits of many years of experience with worm reduction gears.

This series is constructed from a worm gear and a screw shaft (30° trapezoidal screw) and is particularly well suited for heavy loads and offers ample holding force when at rest.
This jack operates by turning the input shaft (worm shaft), rotating the worm wheel (nut) and this movement is transmitted as propulsive force to the screw shaft.
The jack is lubricated with grease in the worm section and screw section.
*The worm section of the JA002 model is lubricated by oil.

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

Ideal bearing structure

A tapered roller bearings is used and in heavy load applications a thrust self-aligning roller bearing is used.

Oil bath lubrication

Oil bath lubrication makes high-speed operation possible and offers easy maintenance.

Tough housing

Models number 100 and above use cast steel for the housing and models 025 to 075 use ductile cast iron (FCD450). (Cast steel production is also available.)

End cap

The end cap is convenient for inspecting the screw shaft.

This jack is lubricated with oil bath lubrication in the worm section and grease lubrication in the screw section.
[JA Series]

[JA Series]


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
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
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
(1800rpm) 38 36 39 39 39 39 42 40 38
L (30rpm)       20 20 20 23 21 20
(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
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)

JAS Series stainless steel screw jacks (Trapezoidal screw)

[JAS Series]

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
L 23 23 23 23
Traveling distance per
one input shaft rotation
H (mm/rev) 0.78 1.04 1.30 1.56
L (mm/rev) 0.26 0.35 0.43 0.52
Efficiency (%) H (30rpm) 21 21 21 23
(600rpm) 25 25 25 27
L (30rpm) 14 13 13 15
(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
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

This series uses a trapezoidal screw.

Ideal bearing structure

This series uses a tapered roller bearing and uses a thrust self-aligning roller bearing for heavy loads.

High precision worm wheel

This series uses a special aluminum bronze material which has been machined with high precision and offers ample strength.

Traveling nut

The traveling nut is crafted from a special aluminum bronze material and offers superior friction resistance.

Large input shaft

This series offers ample strength for the use of multiple connected jacks.

High efficiency reduction

This design offers the benefits of many years of experience with worm reduction gears.

Tough housing

Models number 100 and above use cast steel for the housing and models 025 to 075 use spherical graphite (FCD450). (Cast steel production is also available.)

Oil bath lubrication

Oil bath lubrication makes high-speed operation possible and offers easy maintenance.

This jack operates by turning the input shaft (worm shaft), rotating the worm wheel (screw shaft) and this moves the traveling nut. This design is convenient for use in limited spaces.
Models 005 and 010 are lubricated using a grease bath for the worm section and grease lubrication for the screw section. Models 002 and 025 to 1250 are lubricated using an oil bath for the worm section and grease lubrication for the screw section. A baffle is required for the traveling nut. (Refer to the screw torque in the basic specifications.)
*A baffle is required for the traveling nut.
[JTA Series]

[JTA Series]


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