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GN 3971

Bevel Gear Boxes

Housing Aluminum

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Bevel gear with two output shafts

Description

Specification

Types

Type L: Bevel gear 90°
Type T: Bevel gear with two output shafts

Housing

Aluminum

Sealed to prevent dust entry

Anodized, natural color AN

Bevel gear wheels

Steel, case-hardened

Ball bearing

Steel

Sealed (sealing disks 2RS)

Operating temperature -20 °C to +60 °C

Information

Bevel gear boxes GN 3971 can transmit high torque despite their very compact dimensions. They can readily be used for a multitude of applications, such as height 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.

Technical information

Keyways DIN 6885-1
ISO-Fundamental Tolerances

Mechanical Features

Gear ratio i	1 : 1
Circumferential backlash at the drive shaft	3° ± 0.5°
Shaft direction of rotation	Any
Life expectancy (guideline)	1.000 hours under full load at a rotational speed of 500 rpm,
	assuming the gear box is operating for 20% of every 5 minutes
	(1 minute of operation + 4 minutes break) at an ambient temperature of 20 °C
Maintenance	Permanent lubrication with grease, maintenance-free

b₁	Max. torque in Nm			Max. radial force in N*	Max. axial force in N**
b₁	at 100 min^-1	at 500 min^-1	at 1000 min^-1	Max. radial force in N*	Max. axial force in N**
18	0.35	0.1	0.05	60	60
20	0.75	0.3	0.15	100	100
24	2.5	1	0.5	120	120
26	4	1.5	0.75	140	140
30	5	2	1	240	240
32	8	3	1.5	550	550
35	10	4	2	550	550

* 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 d₆ 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

GN 3971-L

	b₁	d₁ j6	b₂	d₂	d₃**	d₄	d₅***	d₆***	d₇****	h	l₁	l₂	l₃	l₄	m₁	m₂	m₃	m₄	m₅	t₁	t₂
Code																							Actions
GN 3971-18-L-6-AN	18	6	2	13	-	3.1	M 3	M 3	M 3	0.8	32	12	8	2	23	6	8.5	13	11	2.1	15.4	55
GN 3971-20-L-8-AN	20	8	2	16	9.2	3.1	M 3	M 3	M 3	0.8	35	12	8	2	25	7	10	15	10	1.95	15.3	80
GN 3971-24-L-10-AN	24	10	4*	19	11.8	4.1	M 4	M 4	M 4	1.5	42	16	12	3	30	8	12	18	16	2	18	144
GN 3971-26-L-12-AN	26	12	4	21	13.6	4.1	M 4	M 4	M 5	1.5	46	16	12	3	33	9	13	20	16	2	19.5	190
GN 3971-30-L-12-AN	30	12	4	24	16.4	4.1	M 4	M 4	M 5	1.5	53	16	12	3	38	11	15	22	16	2.1	18.3	270
GN 3971-32-L-12-AN	32	12	4	28	19.8	4.1	M 4	M 4	M 5	1.5	56	16	12	3	40	12	17	24	16	2.1	18.3	332
GN 3971-35-L-12-AN	35	12	4	30	20.4	4.1	M 4	M 4	M 5	1.5	60	16	12	3	42.5	13.5	17.5	26	16	2.1	18.3	418

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