A gear coupling is a mechanical device for transmitting torque between two shafts that are not collinear. It consists of a flexible joint fixed to each shaft. The two joints are connected by a third shaft, called the spindle.

Each joint consists of a 1:1 gear ratio internal/external gear pair. The tooth flanks and outer diameter of the external gear are crowned to allow for angular displacement between the two gears. Mechanically, the gears are equivalent to rotating splines with modified profiles. They are called gears because of the relatively large size of the teeth.

Gear couplings and universal joints are used in similar applications. Gear couplings have higher torque densities than universal joints designed to fit a given space while universal joints induce lower vibrations. The limit on torque density in universal joints is due to the limited cross sections of the cross and yoke. The gear teeth in a gear coupling have high backlash to allow for angular misalignment. The excess backlash can contribute to vibration.

Gear couplings are generally limited to angular misalignments, i.e., the angle of the spindle relative to the axes of the connected shafts, of 4-5°. Universal joints are capable of higher misalignments.

Advantages of Tanso gear coupling

1. Lowest price based on large scale production.

2. High and stable quality level.

3. Widely used in various mechanical and hydraulic fields.

4. Compensation for axial, radial and angular misalignment.

5. Convenient axial pl ing assembly.

6. No brittlement at low temperature.

7. Good slippery and frictional properties.

8. Resistance to chemical corrosion.

9. Rich experience working with big companies in this field.

Design advantages

The Flexible Coupling method of connecting rotating shafts is a vital and necessary technique. Large massive shafting, loosely mounted in sleeve bearings and merely joined together by rigidly bolted flanges, cannot provide efficient mechanical power transmission. Especially today, as machine designers and builders demand higher speeds, higher torques, and higher misalignment capacities, the need for “flexibly connecting” this equipment becomes apparent.

A flexible coupling is necessary since it is practically impossible to achieve and maintain perfect alignment of coupled rotating shafts. During initial assembly and installation, precise alignment of the shaft axes is not only difficult to achieve but in many cases it is economically unfeasible. During operation, alignment is even more difficult to maintain. Shaft misalignment – caused by uneven bearing wear, flexure of structural members, settling of foundations, thermal expansion, shaft deflection and other factors – is an operating certainty. Because these factors are extremely difficult to control, a flexible coupling serves as an ideal answer to compensate or minimize the effects of unavoidable misalignment and end movement of coupled shafts.

 

A flexible coupling must provide three basic functions:

1. Physically couple together two rotating shafts for efficient transmission of mechanical power, transferring the torque of one shaft to the other, directly and with constant velocity.

2. Compensate for all types of misalignment between rotating, connected shafts without inducing abnormal stresses and loads on connected equipment, and without tangible loss of power.

3. Compensate for end or axial movement of the coupled shafts, preventing either shaft from exerting excessive thrust on the other and allowing each to rotate in its normal position.

   

Three types of misalignment must be effectively accommodated by a flexible coupling.

1. Parallel Offset – axes of connected shafts are parallel, but not in the same straight line.

2. Angular – axes of shafts intersect at center point of coupling, but not in the same straight line.

3. Combined Angular-Offset – axes of shafts do not intersect at point of coupling and are not parallel.

  

Product description

 

Nylon gear flexible coupling is the latest product,it has been using by abroad,and it is designed by mechanical committee of Jinan Casting forging machinery institute.

Features of NL gear coupling:

1.Absorb parallel,angular and axial misalignments

2.Simple assembly and disassembly

3.Easy maintenance and low noise

4.High tansmission efficiency

5.Long service life

Type	Nominal torqueTn (N.M)	Max speedn (r/min)	Fundamental dimensions (mm)							Max misalignment			Moment of inertia(KgC m 2 )	Mass(Kg )
			Bore diameter  d1 d2	Bore length L 1 L 2	L	D	D1 D2	E	L3	Axial (mm)	Parallel (mm)	Angular α°
NL1	40	6000	6 8 10	16 20 25 32	37 45 55 69	40	26	4	34	2	±0.3	1°	0.25	0.85
			12 14
NL2	100	6000	10 12 14 22	25 32 42 52	57 71 91 111	42	36	4	40	2	±0.4	1°	0.92	1.7
			16 18 20 24
NL3	160	6000	20 22 24	52 62	113 133	66	44	4	46	2	±0.4	1°	3.10	2.6
			25 28
NL4	250	6000	28 30 32	62 82	129 169	83	58	4	48	2	±0.4	1°	8.69	3.6
			35 38
NL5	315	5000	32 35 38	82 112	169 229	93	68	4	50	3	±0.4	2°	14.28	5.5
			40 42
NL6	400	5000	40 42 45	82 112	230	100	68	4	52	3	±0.4	2°	18.34	6.8
			48
NL7	630	3600	45 48 50	82 112	229	115	80	4	60	3	±0.6	2°	56.5	9.8
			55
NL8	1250	3600	48 50 55	112 142	229 289	140	96	4	72	3	±0.6	2°	98.55	26.5
			60 63 65
NL9	2000	2000	60 63 65	142 172	295 351	175	124	6	93	4	±0.7	2°	370.5	37.6
			70 71 75 80
NL10	3150	1800	70 71 75 80	142 172 212	292 352 432	220	157	8	110	4	±0.7	2°	1156.8	55