
Control Pulley	A	B<	C	D	d min	d max	E<	F	G	H	J	K<	L	M>	N	O	Z	Wt
R3	70	65	80	210	19	38	183	230	216	33	125	120	10	105	18	12	112	3.5
R4	80	80	110	245	19	42	234	280	265	36	140	135	10	145	20	14	125	6.0
R5	100	90	110	285	28	48	262	314	293	45	200	165	12	177	24	18	150	10.5
R6	115	112	140	345	38	60	322	379	358	45	200	195	15	228	24	18	172	17.5
R7	140	123	140	415	42	65	338	395	374	45	200	228	15	245	24	18	190	26.5
R8	170	135	140	450	55	75	390	460	439	51	250	247	20	265	30	20	240	42.0
R9	200	165	170	560	45	85	480	570	550	51	250	300	20	250	30	20	310	102.0

Tension Pulley	D	P	R	S	d min	d max	T	V	X>	Wt
K3	210	113	122	60	19	28	15	70	219	3.0
KN34	245	114	137	80	19	38	15	80	231	6.5
K4	245	122	146	80	19	38	17	80	256	6.0
KN45	285	137	171	110	28	45	15	100	270	8.5
K5	285	137	183	110	28	48	28	100	295	9.0
KN56	345	175	210	140	38	60	28	115	319	16.5
K6	345	175	226	140	38	60	30	115	348	17.0
KN67	415	185	251	140	42	60	30	140	388	26.0	Click Image Above for Becker Asymmetrical Belts
KN68	450	226	315	140	55	75	26	140	400	41.0
K7	415	185	260	140	42	60	30	140	418	27.0
KN78	450	228	323	140	55	75	26	170	449	43.0
K8	450	228	345	140	55	75	48	170	457	45.0
KN89	560	255	380	170	65	85	48	200	535	65.0
K9	560	255	380	170	65	85	48	200	575	75.00

Becker	Kw Range	Hp Range	Speed Range	Becker drive units RK, RKN for 5.5 to 150Kw motor ratings, comprising mechanically adjustable regulating pulley R with integral central adjustment and either Spring loaded automatic torque dependent regulating pulley K or KN with increased diameter for lower output speeds. The axial pressure on the V-Belt is exerted by compression springs with optimally dimensioned characteristics. The driving system is suitable for reversing operation. The K - KN tensioning pulleys are uniquely suited to high starting torques and overload protection safety.
RK3	4 ~ 5.5	5.5 ~ 7.5	8/1
RKN34	5.5	7.5	5/1
RK4	7.5 ~ 11	10 ~ 15	8/1
RKN45	11	15	6/1
RK5	11 ~ 15	15 ~ 20	8/1
RKN56	18.5	25	5.4/1
RK6	22 ~ 30	30 ~ 42	8/1
RKN67	30 ~ 37	40 ~ 50	5.5/1
RKN68	37	50	5.2/1
RK7	37 ~ 55	50 ~ 75	6/1
RNK78	45 ~ 55	62 ~ 75	5.2/1
RK8	55 ~ 75	50 ~ 100	5/1
RNK89	75	100	4/1
RK9	90 ~ 150	125 ~ 200	3/1

Mechanically Infinitely Variable Speed Units with Broad V-Belts, BECKER System. Optimum product quality and operational safety for all fields of application in machine and plant construction is achieved by infinitely variable speed control of motors to 150kW. There are good reasons why the Berges BECKER System is obviously superior. As against conventional systems, BECKER variable speed units with asymmetric profile have definite advantages. The asymmetric system with the 2 degree sheave attached to the shaft and the axially moving 18 degree sheave ensures that the tensile forces of the belt are acting very close to the shaft bearings. The bending moment acting on the free shaft ends is small and does not change when the pulleys are varied. In accordance with the pulleys asymmetric broad V-belts are used.

As against conventional systems asymmetric BECKER V-belts have a smaller volume, which means:

More Lateral Rigidity
Lower centrifugal forces
Less internal heating.
more loading capacity
longer service life of the V-Belt
Installation & Pulley Alignment is easier than conventional systems.

The driven pulley with torque curve is another eminent feature of the product diversity of BECKER variable speed drives. The axial contact pressure rises so that sliding of the V-Belt during impact (SHOCK LOAD) or overload or start of machines with the great moments of inertia avoided. Very high efficiency also during partial load operation as well as a considerably longer service life of the belt is ensured by the BECKER driven pulley with torque curve.

For more than 25 years, BECKER variable speed drives have been used successfully all over the world. The investments made in the recent past and planned for the future to guarantee a constant good quality in the long run give a clear signal. BERGES concentrates on the production of mechanical infinitely variable speed drives and has expanded its production program in order to meet the requirements of the market.

TVT-America is well established as a Engineering, Marketing, and Distribution center for the Berges Becker Systems in North America. For assistance in your application, please contact TVT today. Engineering@tvtamerica.com, or simply call our toll free number at your earliest convenience to begin discussions regarding your unique application.

Berges Becker Asymmetrical V-Belt Pulley Drives

Becker Antiriebe GMBH

There are good reasons why the Becker system is obviously superior. As against conventional systems Becker Variable SPeed units with asymmetric profile have definite advantages. The asymmetric systems with the 2 degree sheave attache to the shaft and the axially moving 18 degree sheave ensures that the tensile forces of the belt are acting very close to the haft bearings.

The bending moment acting on the free shaft ends is small and does not change when the pulleys are varied. In accordance with the pulleys asymmetric broad V-Belts are used. As against conventional systems asymmetrical BECKER V-Belts ahve a smaller volume, which means more lateral rigidity, lower centrifugal forces, less internal heating, and thus more loading capacity and longer service life of the asymmetric Becker V-belt.

As against gear drives with sheaves of the same angle, installation and pulley alignment are very easy. With the asymmetric BECKER variable speed units pulley alignment is achieved automatically and can be easily checked by lining the back of the 2 degree sheaves of both pulleys with a ruler. The driven pulley with torque curve is another eminent feature of the product diversity of Becker variable speed drives. Theaxial contact pressure of the V-belt required for the respective power tranmission is automatically adjusted by this toruq dependent device. With increasing torque the axial contact pressure rises so that sliding of the v-belt during impact or overlad or start of machines with great moments of inertia is avoided. Very high efficiency also during partial load operation as well as a considerably longer service life of the belt is ensured by the Becker driven pulley with torque curve. For more than 25 years, Becker variable speed drives have been used successfully all over the world. The investments made in the recent past and planned for the future to guarantee a constat good quality in the long run give a clear signal: Berges-Becker will concentrate on the production of mechanically infinitely variable speed drives also in the future and expand the production program in order to meet the requirements of the market. This is another eature that distinguishes us from our competitors.