Gear couplings

 

LLC "Techprommetsnab" supplies all types of gear couplings. Couplings are manufactured in accordance with the requirements of GOST 50895-96, GOST 5006-83 or according to the Customer's specifications.

The gear coupling is designed to transfer rotation from the motor to the shaft, from one shaft to another with an allowable angular displacement.

According to the nature of the coupling , the couplings are divided into five types: 

1. rigid ones that do not allow rotation of one shaft relative to another; elastic (elastic) ones that allow relative rotation of the shafts due to elastic deformation of the metal intermediate parts of the coupling;
2. elastic-damping, allowing relative rotation of the shafts, usually due to elastic-plastic deformation of non-metallic intermediate parts of the coupling; 
3. frictional, allowing relative rotation of the shafts due to the relative slippage of the conjugate friction surfaces with an increase in the transmitted torque above the limit value; 
4. sliding (hydraulic, electromagnetic), capable of transmitting torque only at a certain difference in the angular velocities of the shafts.

According to the nature of the work and the main purpose , the couplings differ:

1. permanent, not allowing the shafts to be uncoupled during the operation of the machine;
2. controllable and coupling, allowing to open and close the shafts by acting on the coupling through the control system;
3. self-controlled, opening and closing shafts automatically when changing the operating mode of the machine (centrifugal overtaking clutches);
4. safety, closing shafts in case of violation of normal operating conditions of the machine (clutches that protect against overloads);
5. equalizing.

TYPE A

When naming couplings, they do not strictly adhere to the specified classification, they are called on a constructive basis. For example, a rigid permanent coupling is simply called a toothed, an elastic—damping permanent coupling is called a sleeve-finger or elastic. Couplings are also called for their intended purpose, for example, safety, equalization. The gear coupling is mainly used to connect electric motors to the primary shaft of the gearbox.

The coupling consists of two half couplings with internal teeth and two bushings with external teeth. One of the bushings is mounted on the shaft of the electric motor, the second — on the shaft of the gearbox. The coupling halves are connected by bolts. The teeth of the bushings engage with the teeth of the coupling halves, which ensures the transmission of torque from the motor shaft to the gearbox shaft.

Due to the gear transmission in this connection, the displacement of the connected shafts of one relative to the other is allowed, as well as the misalignment of the shafts at an angle of no more than 2 °. The driven coupling half can also be the brake pulley of the brake. The elastic coupling consists of two half—couplings - the leading one, rigidly connected by a key to the motor shaft, and the driven one — with the gearbox shaft. Both coupling halves are connected by fingers, on the free ends of which elastic bushings 5 made of technical rubber are put on. The fingers are tightly fastened with nuts in the holes of the leading half coupling. When shifting the coupling halves, the ends of the fingers move freely in the hole of the driven coupling half, which provides the necessary compensation for inaccuracies. The driven coupling half serves as the brake pulley of the brake at the same time.

The equalizing coupling consists of two half-couplings and a disk enclosed between them. A groove is made in the half couplings, and in the disc there are corresponding projections located on both sides of it perpendicular to one another. In the case of misalignment of the shafts during their rotation, the coupling halves slide in the grooves one relative to the other, thus compensating for the displacement of the shaft axes.

The safety clutch consists of a half coupling mounted on the driven shaft, a spring freely sitting on the drive shaft, discs, a leading half coupling mounted on the shaft, and an adjustment nut.

The disks are rigidly connected to the half coupling, and the disks are connected to the half coupling. When the spring is unclenched, the discs can freely rotate one relative to the other and the torque is not transmitted from shaft to shaft. During the compression of the spring by the nut, friction is created between the discs. Depending on the compression force of the spring nut, it is possible to create the necessary amount of transmitted torque from shaft to shaft.

In the event of resistance exceeding the load on the driven shaft, the clutch discs slip, which prevents possible breakdowns in the transmission mechanisms. Thus, the safety clutch ensures the safety of the mechanisms during crane overloads. Safety clutches are placed mainly in turning mechanisms, where overloads occur due to sudden braking of the turning mechanism. In the lifting mechanism, the use of these couplings is unacceptable.

THE MAIN CHARACTERISTICS OF THE M3 TYPE GEAR COUPLINGS

Name	D, mm	d, mm	В, mm	В1, mm	Torque, Nhm	Rotation speed, rev/min	Weight, type А/В kg
Coupling МЗ-1	170	20	115	129	1000	6300	11,8/10,6
Coupling МЗ-2	185	30	145	160	1600	5000	16,1/15,4
Coupling МЗ-3	220	40	170	196,5	2500	4000	29,3/29,8
Coupling МЗ-4	250	45	215	234	4000	3350	50,5/47,3
Coupling МЗ-5	290	50	235		6300	2800	61/62
Coupling МЗ-6	320	60	255		10000	2500	81/80
Coupling МЗ-7	350	65	285		16000	2120	109/111
Coupling МЗ-8	380	80	325		25000	1900	146/147
Coupling МЗ-9	430	90	335		40000	1700	176/179
Coupling МЗ-10	490	110	365		63000	1400	264/264
Coupling МЗ-11	545	120	425		71000	1250	376/372
Coupling МЗ-12	590	140	487	485	10000	1130	531/520
Coupling МЗ-13	680	160	521	523	15000	1000	739/750
Coupling МЗ-14	730	180	571	568	20000	900	933/924
Coupling МЗ-15	780	200	645		25000	800	1288/1290

Gear couplings of general machine-building application for connecting coaxial shafts and transmitting torque from 1000 to 63000 N x m according to GOST R 50895 and special from 71000 to 250,000 N x m with angular, radial and axial shaft displacements.

Compensation of shaft displacements and misalignments is achieved by relative misalignment of bushings and clips due to lateral gaps between the teeth and the spherical surface of the protrusions of the teeth of the bushings. The misalignment of the axis of each sleeve relative to the axis of the cage is no more than 1 °30'.

Operating conditions:

1. the work is long-lasting up to 24 hours a day or with periodic stops;
2. the speed of rotation is not more than the value specified in the table of technical characteristics;
3. rotation in any direction.

Example of designation:

1. Gear coupling MZ - 8 - N80: gear coupling MZ - 8 with a nominal transmitted torque of 23600 N x m, the diameters of the mounting holes in the bushings are 80 mm without end mounting on the shafts.
2. Gear coupling MZP - 8 - N80: gear coupling MZP - 8 with a nominal transmitted torque of 23600 N x m, the diameters of the landing holes in the bushings are 80 mm without end mounting on the shafts.

All of the above gear couplings are not a complete list of the variety of these products. For more information about the types of gear couplings, sizes and their characteristics, you can find out by contacting our specialists.