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GN 3975 Worm Gear Reducers Housing Aluminum

Type: B - Continuous drive

Standard sheet GN 3975 Print this page Keyways DIN 6885-1 ISO Fundamental Tolerances

Product description

Worm gear reducers GN 3975 can transmit high torque despite their very compact dimensions. They can readily be used for a multitude of applications, such as incline adjustments or to change the direction of shaft rotation.

The numerous fastening holes allow for simple mounting in any orientation or position. The parallel keys can take any angular positions.

Depending on the gear ratio, there may be no static self-braking between the worm screw and worm wheel, meaning that the worm wheel can be turned out of a resting state by a torque coming from the output end.

Specification

Housing
Aluminum

Sealed to prevent dust entry
Anodized, natural colorAN

Worm screw
Steel

Worm wheel
Brass

Ball bearing
Steel
Sealed (sealing disks 2RS)

Operating temperature -20 °C to +60 °C

RoHS

GN 3975 Worm Gear Reducers, Housing Aluminum sketch

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Article options / Table

Type

A	One-side drive
B	Continuous drive

m₁	d₁ j6	Gear ratio i	b₁	b₂	b₃ JS9	d₂ H7	d₃	d₄	d₅	h	l₁	l₂	l₃	l₄	t₁	t₂	t₃	t₄

20	12	5	13	15	18	23	30	40	65	35	4	4	12	30	20	27,4	1,5	60	16	12	3	2	13,8	1,6	18,3
30	12	5	10	17	20	25	34	45	64	40	4	5	14	30	25	27,4	1,5	80	16	12	3	4	16,3	2	20,5

m₁	d₆*	d₇	d₈*	m₂	m₃	m₄	m₅	m₆	m₇	m₈	m₉	m₁₀

20	M 4	4,2	M 5	26	50	17,5	1,5	31	26	42,5	22,5	26
30	M 5	5,5	M 5	40	60	20	10	15	26	57,5	30	30

* Usable thread depth: min. 1.6 x d₆ / d₈

Build & Price

Mechanical Features

Circumferential backlash at the drive shaft

1° ± 0.5°

Shaft direction of rotation

Any

Worm screw direction

Left

Life expectancy

1,000 hours under full load and rotational speed of 500 rpm,
assuming the gear box is operating for 20% of every 5 minutes (guide value)
(1 minute of operation + 4 minutes break) at an ambient temperature of 20 °C

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m₁	Gear ratio	Max. input torque in Nm* at 100 min^-1	at 500 min^-1	at 1000 min^-1	Max. output torque in Nm* bei 100 min^-1	at 500 min^-1	at 1000 min^-1

20	5	2,9	2,3	1,7	10	8	6
20	13	2,1	1,8	1,5	15	13	11
20	15	1,5	1,3	1	12	10	8
20	18	1,1	0,9	0,7	11	9	7
20	23	0,9	0,7	0,5	10	8	6
20	30	0,6	0,5	0,4	8,5	7	5,5
20	40	0,35	0,31	0,26	5,5	4,8	4
20	65	0,24	0,2	0,16	4,5	3,8	3
30	5	5,4	4,9	4,3	19	17	15
30	10	3,4	3,1	2,8	20	18	16
30	17	2,2	1,9	1,8	17	15	14
30	20	1,7	1,6	1,4	15	13,5	12
30	25	1,3	1,2	1,1	13,5	12	11
30	34	1,2	1,1	1	12	11	10
30	45	0,9	0,8	0,8	10,5	9,5	9
30	62	0,5	0,4	0,3	8,5	7,5	6

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m₁	Gear ratio	Input side Max. radial force in N**	Max. axial force in N**	Output side Max. radial force in N**	Max. axial force in N**	Efficiency in %	Self- braking static

20	5	200	200	500	500	70	-
20	13	200	200	500	500	56	-
20	15	250	250	500	500	52	-
20	18	250	250	500	500	55	-
20	23	250	250	500	500	50	-
20	30	350	350	500	500	45	-
20	40	400	400	500	500	39	x
20	65	500	500	500	500	29	x
30	5	400	300	800	800	70	-
30	10	400	300	800	800	58	-
30	17	400	400	800	800	46	-
30	20	800	400	800	800	43	-
30	25	800	800	800	800	41	-
30	34	600	800	800	800	29	-
30	45	700	600	800	800	25	-
30	62	700	600	800	800	27	x

*Input side speed, **at axial force = 0, ***at radial force = 0

Assembly Instructions

Do not exert any forces onto the housing or into the bearings during assembly. Use of the threaded holes d₈ in the shaft is recommended.

The use of a corresponding coupling is recommended to compensate for manufacturing-related shaft offsets and runout tolerances as well as for damping vibrations and shocks.

Application Example

Selected Part (How to order)

Part number

Total (net)

278,14 €

plus VAT 52,85 €
gross 330,99 €

In stock

Weight: 0,434 kg

If this article is new in our product range, it may happen that details concerning weight are as yet not listed.
If you do need weight details, please contact our Sales Department!
Phone +49 7723 6507 - 0

RoHS: Yes

This article is RoHS-compliant in application of Annex III., which means it complies with EU Directive 2011/65/EU, including extension (2015/863/EU), for restricting the use of certain hazardous substances in electrical and electronic devices. The Directive regulates the use of hazardous substances in devices and components. The implementation in national law is summarily described with RoHS(Restriction of (the use of certain) hazardous substances).

Customs tariff number

84834025

Please note our order discounts.

With a total value (net) per order:
from 175,00 € -> 10 % discount
from 275,00 € -> 20 % discount
from 375,00 € -> 30 % discount

Surcharge for small volume purchases:
-> 15,00 Euro
for value of goods less than 25,00 €
-> 10,00 Euro
for value of goods from 25,00 to 49,99 €

Quantity

All prices in accordance with our price list No. 56, valid from 1 September 2024, plus VAT only valid for Germany.