
Control Pulley	A	B<	C	D	d min	d max	E<	F	G	H	J	K<	L	M>	N	O	Z	Wt
R1	46	42	50	125	14	24	126	163	153	26	80	70	8	70	16	8	85	1.5
R2	55	59	60	175	14	28	165	206	193	30	100	100	10	95	17	12	102	2.5
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

Tension Pulley	D	P	R	S	d min	d max	T	V	X>	Wt
F1	125	67	88	50	14	24	12	46	134	1.0
FN12	175	73	103	60	14	25	13	46	169	1.8
F2	175	74	103	60	14	25	13	55	185	1.8
FN23	210	91	116	60	19	28	12	70	199	2.5
F3	210	91	120	60	19	28	15	70	219	3.0
FN34	245	120	143	80	19	38	15	80	234	6.5
F4	245	120	150	80	19	38	17	80	256	6.5	Click Image Above for Becker Asymmetrical Belts
FN45	285	130	165	110	28	45	15	100	270	9.5
F5	285	130	177	110	28	45	28	100	295	10.5
FN56	345	145	222	140	38	60	28	115	319	17.0
F6	345	145	248	140	38	60	30	115	348	17.5
FN67	415	145	241	140	47	60	30	140	388	21.5
F7	415	145	248	140	42	60	30	140	418	23.0

Becker System	Kw Range	Hp Range	Speed Range	Berges Becker drive units RF, RFN for 0.37 to 45Kw motor ratings, comprising mechanically adjustable regulating pulley R with integral central adjustment and either Spring loaded regulating pulley F or FN 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.
RF1	0.37 ~ 1.1	0.5 ~ 1.5	5/1
RF12	1.5	2	5/1
RF2	2.2~3	3 ~ 4	7.7/1
RFN23	3 ~ 4	4 ~ 5.5	5/1
RF3	4 ~ 5.5	5.5 ~ 7.5	8/1
RFN34	5.5	7.5	5/1
RF4	7.5 ~ 11	10 ~ 15	8/1
RFN45	11	15	6/1
RF5	11 ~ 15	15 ~ 20	8/1
RFN56	18.5	25	5.4/1
RF6	22 ~ 30	30 ~ 42	8/1
RFN67	30 ~ 37	40 ~ 50	5.5/1
RF7	37 ~ 45	50 ~ 62.5	6/1

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.