BK7

Bellows couplings

The BK7 bellows coupling from R+W Couplings is compact and makes assembly and disassembly very easy. The mandrel provides high clamping force in hollow shafts and pulleys or gears. Additionally, the coupling has a low moment of inertia. Thanks to the use of a friction clamp connection, this precision coupling is entirely free from play. Thanks to the forcibly formed bellows, the element can simultaneously accommodate lateral, axial, and angular misalignments. As long as these misalignments do not exceed the maximum range, there will be no metal fatigue in the bellows material, and the coupling will remain completely free from wear. For specific inquiries about bellows couplings, please contact VARIODRIVE.

Version

Mandrel and clamp hub

Nom. Torque

15-300 Nm

Speed

tot 10.000 rpm

Temperature range

-30 to +100 oC

Bellows material

Stainless steel

Hub material

Steel or aluminum

Peak load

Up to 1.5 times the nominal value. Torque

Clearance

None

Service-life

No service

Optional

ATEX, cleanroom version

Datasheets

Bestelcode instructies
ATEX instructies
Datasheet BK7

Manuals

Manual BK/MK koppelingen

Tabel

BK7 Series		15	30	60	150	300
Rated torque (Nm)	TKN	15	30	60	150	300
Overall length (mm)	A-2	45 \| 152	53 \| 61	62 \| 72	71 \| 83	84 \| 98
Inside diameter possible from Ø to Ø H7 (mm)	DI	8-28	10-30	12-35	19-42	30-60
Outside diameter (mm)	B	49	55	66	81	110
Moment of inertia (10-3 kgm2)	Jges.	0,07 \| 0,08	0,14 \| 0,15	0,23 \| 0,26	2,2 \| 2,4	6,5 \| 8,9
Approximate weight (kg)		0,15	0,3	0,4	1,7	4
Torsional stiffness (10³ Nm/rad)	CT	20 \| 15	39 \| 28	76 \| 55	175 \| 110	450 \| 350
Axial ± (mm))	max.	1 \| 2	1 \| 2	1,5 \| 2	2 \| 3	2,5 \| 3,5
Lateral ± (mm)	max.	0,15 \| 0,2	0,2 \| 0,25	0,2 \| 0,25	0,2 \| 0,25	0,25 \| 0,3
Angular ± (degree)	max.	1 \| 1,5	1 \| 1,5	1 \| 1,5	1 \| 1,5	1 \| 1,5
Axial spring stiffness (N/mm)	ca	20 \| 12	50 \| 30	72 \| 48	82 \| 52	105 \| 71
Lateral spring stiffness (N/mm)	cr	315 \| 108	730 \| 230	1200 \| 1380	1550 \| 435	3750 \| 1050
Fastening screw (ISO 4762)	E1/2	M5	M6	M8	M10	M12
Tightening torque of the fastening screw (Nm)	E1/2	8	14	38	65	120
Distance between centerlines (mm)	F	17	19	23	27	39
Distance (mm)	G	6,5	7,5	9,5	11	13
Mounting length (mm)	Cl	22	27	31	36	43
Fit length (mm)	C2	20	25	27	32	45
Shaft diameter from Ø to Ø h7 (mm)	D2	13-25	14-30	23-38	26-42	38-60
Hub material		Aluminium	Aluminium	Aluminium	Steel	Steel
		15	30	60	150	300

Downloads

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Datasheets
Manuals

Datasheets
Datasheets
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Frequently Asked Questions

How can I place an order with VARIODRIVE?

You can place an order with VARIODRIVE by sending your request to orders@variodrive.nl. Your request will then be processed directly by our internal sales team.

Why should I choose a complete solution from VARIODRIVE?

By choosing VARIODRIVE’s complete solution, you won’t need to worry about integrating different drive components into the machine’s drive chain. We stand behind our complete solution and can guarantee its functionality.

Why should I choose VARIODRIVE's system warranty?

Due to our in-depth knowledge of our products and their integration into applications, we can provide a system warranty. At that point, we guarantee that the application will function using our motion control and traction solutions.

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BK7

Specifications