BMU (Plate design) Mechanical Backlash-free

Specially designed with a mechanical structure eliminating the gap between the gears and racks inside the reducer and completely mitigating the backlash caused by manufacturing or installation errors when the general reducer drives the rack and pinion, and compensates or eliminates it. Driven by a single servo motor, enclosed mechanical preload system is more efficient than electrical preload system. The output flange is a plate design and easy to install or adjust.

Precision Level
Torsional Rigidity
Price Range

Industry Applications: CNC Machine Tools; Special Purpose Machines (SPMs); Engineering Machinery

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Enclosed Gearbox

Specially designed machinery is able to eliminate clearance from the gearbox inner and from between pinions and racks. This completely supplements and clears up the backlash of manufacture or/and installation while gearboxes drive both pinions and racks.

Cost saving

Mechanical preload system, driven by a single servo motor, can reach the goal of electrical preload system, save controller and driver cost.
Backlash eliminating enables processing tool tracks stable, which prolongs tool life.

Easy to set up

Parameter setting can be easier for enclosed mechanical preload system, driven by a single servo motor, than electrical preload system.

Better processing surface smooth and accuracy

Backlash reducing enables improved processing surface smoothness and accuracy.

Huge Torsional Rigidity

For the well-designed structure and high duty material of taper roller bearing, the output shaft of the reducer can bear the huge axial and radial load, which could be wide application.

High Dynamics

One-piece output design, special high strength the fewer teeth of pinion and smaller servo motor, achieve the low moment of inertia.

Precise Positioning

Precision gear grinding tooth surface smooth, precise tooth.
For an excellent design, high accuracy and low moments of inertia.

Long Service Life and Low Noise

For the professional gear producing experience and the serious quality control of manufacturing processes.
After a long time operation, the preloading force is still maintained.

1-stage
2-stage

This product does not have technical data for 1-stage for reference. We recommend searching for technical data for 2-stage instead.

BMU Technical Data (2-stage) Ratio 32~110

Specifications		Ratios	BMU140	BMU160	BMU180	BMU210	BMU240
Output Torque (1) T2B	Nm	32	1120	1770	2500	5920	9395
		40	1120	1770	2500	5920	9395
		44	950	1545	2220	5430	7950
		55	950	1545	2220	5430	7950
		66	950	1545	2220	5430	7950
		77	950	1545	2220	5430	7950
		88	950	1545	2220	7950	5430
		110	950	1545	2220	5430	7950
Emergency Stop Torque(2) T2Not	Nm	32	2320	3650	5150	12800	19300
		40	2320	3650	5150	12800	19300
		44	1950	3140	4330	10990	16110
		55	1950	3140	4330	10990	16110
		66	1950	3140	4330	10990	16110
		77	1950	3140	4330	10990	16110
		88	1950	3140	4330	10990	16110
		110	1950	3140	4330	10990	16110
Nominal Outout Torque T2N	Nm	32	735	1150	1645	3890	6180
		40	735	1150	1645	3890	6180
		44	625	1000	1460	3570	5230
		55	625	1000	1460	3570	5230
		66	625	1000	1460	3570	5230
		77	625	1000	1460	3570	5230
		88	625	1000	1460	3570	5230
		110	625	1000	1460	3570	5230
Nominal Input Speed n1N	rpm	32	3000	3000	3000	2500	2000
		40	3000	3000	3000	2500	2000
		44	3000	3000	3000	2500	2000
		55	3000	3000	3000	2500	2000
		66	3000	3000	3000	2500	2000
		77	3000	3000	3000	2500	2000
		88	3000	3000	3000	2500	2000
		110	3000	3000	3000	2500	2000
Maximum Input Speed n1Max	rpm	32	4000	4000	4000	3500	3500
		40	4000	4000	4000	3500	3500
		44	4000	4000	4000	3500	3500
		55	4000	4000	4000	3500	3500
		66	4000	4000	4000	3500	3500
		77	4000	4000	4000	3500	3500
		88	4000	4000	4000	3500	3500
		110	4000	4000	4000	3500	3500
Efficiency with Full Load	%	32	≥93	≥93	≥93	≥93	≥93
		40	≥93	≥93	≥93	≥93	≥93
		44	≥93	≥93	≥93	≥93	≥93
		55	≥93	≥93	≥93	≥93	≥93
		66	≥93	≥93	≥93	≥93	≥93
		77	≥93	≥93	≥93	≥93	≥93
		88	≥93	≥93	≥93	≥93	≥93
		110	≥93	≥93	≥93	≥93	≥93
Service Life LH2	h	32	20000	20000	20000	20000	20000
		40	20000	20000	20000	20000	20000
		44	20000	20000	20000	20000	20000
		55	20000	20000	20000	20000	20000
		66	20000	20000	20000	20000	20000
		77	20000	20000	20000	20000	20000
		88	20000	20000	20000	20000	20000
		110	20000	20000	20000	20000	20000
Mass Moments of Inertia	kg‧cm2	32	39.77	42.80	95.73	228.50	360.00
		40	39.77	42.80	95.73	228.50	360.00
		44	39.77	42.80	95.73	228.50	360.00
		55	39.77	42.80	95.73	228.50	360.00
		66	39.77	42.80	95.73	228.50	360.00
		77	39.77	42.80	95.73	228.50	360.00
		88	39.77	42.80	95.73	228.50	360.00
		110	39.77	42.80	95.73	228.50	360.00
Helical Tooth Pinion (Module)	M	32	M4	M4	M5	M6	M8
		40	M4	M4	M5	M6	M8
		44	M4	M4	M5	M6	M8
		55	M4	M4	M5	M6	M8
		66	M4	M4	M5	M6	M8
		77	M4	M4	M5	M6	M8
		88	M4	M4	M5	M6	M8
		110	M4	M4	M5	M6	M8
Helical Tooth Pinion (N# of Teeth)	T	32	15T	18T	15T	18T	15T
		40	15T	18T	15T	18T	15T
		44	15T	18T	15T	18T	15T
		55	15T	18T	15T	18T	15T
		66	15T	18T	15T	18T	15T
		77	15T	18T	15T	18T	15T
		88	15T	18T	15T	18T	15T
		110	15T	18T	15T	18T	15T
Spur Tooth Pinion (Module)	M	32	M4	M4	M5	M6	M8
		40	M4	M4	M5	M6	M8
		44	M4	M4	M5	M6	M8
		55	M4	M4	M5	M6	M8
		66	M4	M4	M5	M6	M8
		77	M4	M4	M5	M6	M8
		88	M4	M4	M5	M6	M8
		110	M4	M4	M5	M6	M8
Spur Tooth Pinion (N# of Teeth)	T	32	16T	19T	16T	19T	16T
		40	16T	19T	16T	19T	16T
		44	16T	19T	16T	19T	16T
		55	16T	19T	16T	19T	16T
		66	16T	19T	16T	19T	16T
		77	16T	19T	16T	19T	16T
		88	16T	19T	16T	19T	16T
		110	16T	19T	16T	19T	16T
Pitch Circle Diameter (Helical Tooth Pinion)	Ø	32	Ø63.66	Ø79.39	Ø79.58	Ø114.59	Ø127.32
		40	Ø63.66	Ø79.39	Ø79.58	Ø114.59	Ø127.32
		44	Ø63.66	Ø79.39	Ø79.58	Ø114.59	Ø127.32
		55	Ø63.66	Ø79.39	Ø79.58	Ø114.59	Ø127.32
		66	Ø63.66	Ø79.39	Ø79.58	Ø114.59	Ø127.32
		77	Ø63.66	Ø79.39	Ø79.58	Ø114.59	Ø127.32
		88	Ø63.66	Ø79.39	Ø79.58	Ø114.59	Ø127.32
		110	Ø63.66	Ø79.39	Ø79.58	Ø114.59	Ø127.32
Pitch Circle Diameter (Spur Tooth Pinion)	Ø	32	Ø64	Ø76	Ø80	Ø114	Ø128
		40	Ø64	Ø76	Ø80	Ø114	Ø128
		44	Ø64	Ø76	Ø80	Ø114	Ø128
		55	Ø64	Ø76	Ø80	Ø114	Ø128
		66	Ø64	Ø76	Ø80	Ø114	Ø128
		77	Ø64	Ø76	Ø80	Ø114	Ø128
		88	Ø64	Ø76	Ø80	Ø114	Ø128
		110	Ø64	Ø76	Ø80	Ø114	Ø128
Circumference (Helical Tooth Pinion)		32	200	240	250	360	400
		40	200	240	250	360	400
		44	200	240	250	360	400
		55	200	240	250	360	400
		66	200	240	250	360	400
		77	200	240	250	360	400
		88	200	240	250	360	400
		110	200	240	250	360	400
Circumference (Spur Tooth Pinion)		32	201.06	238.76	251.33	358.14	402.12
		40	201.06	238.76	251.33	358.14	402.12
		44	201.06	238.76	251.33	358.14	402.12
		55	201.06	238.76	251.33	358.14	402.12
		66	201.06	238.76	251.33	358.14	402.12
		77	201.06	238.76	251.33	358.14	402.12
		88	201.06	238.76	251.33	358.14	402.12
		110	201.06	238.76	251.33	358.14	402.12
Addendum Modification Coefficient (Helical Tooth Pinion)		32	0.355	-	0.3723	-	0.355
		40	0.355	-	0.3723	-	0.355
		44	0.355	-	0.3723	-	0.355
		55	0.355	-	0.3723	-	0.355
		66	0.355	-	0.3723	-	0.355
		77	0.355	-	0.3723	-	0.355
		88	0.355	-	0.3723	-	0.355
		110	0.355	-	0.3723	-	0.355
Addendum Modification Coefficient (SpurTooth Pinion)		32	0.475	-	0.45	-	0.4375
		40	0.475	-	0.45	-	0.4375
		44	0.475	-	0.45	-	0.4375
		55	0.475	-	0.45	-	0.4375
		66	0.475	-	0.45	-	0.4375
		77	0.475	-	0.45	-	0.4375
		88	0.475	-	0.45	-	0.4375
		110	0.475	-	0.45	-	0.4375

Note (1) Data are measured at the frequency under 1000 times per hour. Contact us if your data are beyond the presented table above.
Note (2) Operation can be up to 1000 times in product life.

1-stage
2-stage

This product does not have dimensions for 1-stage for reference. We recommend searching for dimensions for 2-stage instead.

BMU dimensions (2-stage ratio 32 / 40 / 44 / 55 / 66 / 77 / 88 / 100 / 110)[mm]

Frame size	BMU140	BMU160	BMU180	BMU210	BMU240
Stage	2	2	2	2	2
H1	220	285	300	380	400
H2	200	255	275	340	360
H3	10	15	12.5	20	20
H4	40	51	55	68	72
L1	410	490	540	650	720
L2	390	460	515	610	680
L3	10	15	12.5	20	20
L4	39	46	51.5	61	68
L5	189	207	240	270	320
L6	353	386	458	512	600
W1	43	43	54	65	86
W2	2	4.5	3	3	3
W3	62	62.5	77	89.5	114
W4	20	22	25	35	40
W5	30	36.5	46	45	51
W6	279	301.5	353	446	469.5
※W7	51.5	52	32.5	54	48
W8	422.5	452.5	514	623	682.5
※W9	176	176	176	176	190
※W10	10	15	15	10	10
※W11	82	82.5	98	85	83.5
D1	9	11	11	18	18
D2(F7) max.	38	38	42	48	55
D3	114.3	114.3	114.3	114.3	180
D4	200	200	200	200	215
n	30	30	30	30	30
R	10	10	10	20	20

※Actual dimensions marked above may vary from different servo motors.
We persistently research in and develop our products, and we have made every effort to maintain the specification data above correct. If there is any discrepancy between the data and real dimensions, please refer to products or may contact us for updated data.

BMU dimensions(Input shaft type) (2-stage ratio 32 / 40 / 44 / 55 / 66 / 77 / 88 / 100 / 110)[mm]

Frame size	BMU140	BMU160	BMU180	BMU210	BMU240
Stage	2	2	2	2	2
H1	220	285	300	380	400
H2	200	255	275	340	360
H3	10	15	12.5	20	20
H4	40	51	55	68	72
L1	410	490	540	650	720
L2	390	460	515	610	680
L3	10	15	12.5	20	20
L4	39	46	51.5	21	68
L5	189	207	240	270	320
L6	353	386	458	512	600
W1	43	43	54	65	86
W2	2	4.5	3	3	3
W3	62	62.5	77	89.5	114
W4	20	22	25	35	40
W5	30	36.5	46	45	51
W6	262.5	278	308	402.5	443.5
W7	88	88	105	115	111
W8	442.5	465	536	652	719.5
W9	73	73	83	85	85
W10	70	70	80	82	82
D1	9	11	11	18	18
D2(k6) max.	40	40	42	50	55
n	30	30	30	30	30
R	10	10	10	20	20

Mounting positions

Ordering information Installation orientation

Rack

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