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Torque Limiters SK

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Bellows coupling model BK7 with expanding shaft

Model BK7		Series
		15		30		60		150		300
Rated torque (Nm)	TKN	15		30		60		150		300
Overall length (inserted) (mm)	A-2	45	52	53	61	62	72	71	83	84	98
Outer diameter (mm)	B	49		55		66		81		110
Fit length (mm)	C1	22		27		32		36		43
Inner diameter possible from Ø to Ø H7 (mm)	D1	8-28		10-30		12-35		19-42		30-60
Fit length (mm)	C2	20		25		27		32		45
Shaft Diameter possible from Ø to Ø h7 (mm)	D2	13-25		14-30		23-38		26-42		38-60
Fastening screws ISO 4762	E1/2	M5		M6		M8		M10		M12
Tighting torque of the Fastening screws (Nm)	E1/2	8		14		38		65		120
Distance between centers (mm)	F	17		19		23		27		39
Distance (mm)	G	6.5		7.5		9.5		11		13
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
Hub material (standard) (steel on request)		Al		Al		Al		Steel		Steel
Approx. 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
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	380	1550	435	3750	1050
Downloads short version		15		30		60		150		300
2D-DXF (ZIP folder)
3D-EXE (Viewer)
3D-STEP (ZIP folder)
Downloads long version		15		30		60		150		300
2D-DXF (ZIP folder)
3D-EXE (Viewer)
3D-STEP (ZIP folder)

(1Nm = 8.85 in lbs),      max. angular misalignment 1 degree

Technical instructions:

By tightening the screw through the bellow body, the shaft is caused to expand.
The coupling is designed for high dynamic hollow shaft connections eg.
gear boxes. Recommended bore tolerance: ISO H7

 

 

 

Torsionally Rigid and Flexible Shaft Couplings

Last update: 10-09-2008