coupling

Couplings can be divided into heavy, medium, small and light according to the transmitted torque size in practical applications.

Medium and light universal couplings are often used in automobiles, machine tools and other vehicles and light industrial machinery.

Small universal coupling is mainly used to transfer motion, generally used in precision machinery and control mechanisms. So how to choose the right coupling, when using what are the matters needing attention?

1 Coupling application selection

1. Due to manufacturing, installation, load deformation and temperature changes, it is difficult to maintain the strict alignment of the two axes after installation and adjustment.

There is a certain degree of X and Y direction displacement and deviation Angle CI. When the radial displacement is large, the slider coupling can be selected, and the universal coupling can be selected when the angular displacement is large or the connection between the two axes is intersecting. When the two axes have a large additional relative displacement in the working process, flexible coupling should be selected.

Universal coupling

2. The working speed of the coupling and the centrifugal force caused by it.

For high speed drive shaft, should choose the coupling with high balance accuracy, such as diaphragm coupling, and should not choose the existence of eccentric slider coupling.

Cross slider coupling

3. The size and nature of the torque required to be transferred and the requirements for the buffering and vibration reduction function.

For example, for high-power heavy load transmission, can choose the gear coupling; The coupling with high elasticity can be selected for the transmission of severe impact load or the transmission requiring the elimination of torsional vibration of shafting system.

Helical gear coupling

4. The working speed of the coupling and the centrifugal force caused by it.

For high speed drive shaft, should choose the coupling with high balance accuracy, such as diaphragm coupling, and should not choose the existence of eccentric slider coupling.

Diaphragm coupling

5. The size and direction of the relative displacement of the two axes.

When it is difficult to maintain the strict alignment of the two axes after installation and adjustment, or the two axes will produce a large additional relative displacement in the working process, flexible coupling should be selected. For example, when the radial displacement is large, the slider coupling can be selected, and the universal coupling can be selected for the connection of the larger angular displacement or the intersection of the two axes.

6. Reliability and working environment of the coupling.

Unlubricated couplings, usually made of metal elements, are more reliable; The performance of couplings requiring lubrication is easily affected by the degree of lubrication perfection and may pollute the environment. Coupling containing rubber and other non-metallic components is sensitive to temperature, corrosive media and strong light, and easy to age.

Slide block coupling

7. Manufacture, installation, maintenance and cost of couplings.

On the premise of satisfying the convenient performance, the coupling with convenient assembly and disassembly, simple maintenance and low cost should be selected. For example, the rigid coupling is not only simple in structure, but also convenient in assembly and disassembly. It can be used for low speed and large rigid drive shaft. General non-metallic elastic coupling (such as elastic sleeve pin coupling, elastic pin coupling, plum blossom elastic coupling, etc.), because of its good comprehensive ability, is widely used in general medium and small power transmission.

Coil spring coupling

2 The use of coupling matters needing attention

01 Coupling is not allowed to exceed the specified axis line skew and radial displacement, so as not to affect its transmission performance.

After the installation of the 02 000 direction coupling, the normal operation of a shift, it is necessary to check all fastening screws, if found loose, must be tightened again with the prescribed tightening torque, so repeated several shifts, to ensure that it will not loosen.

03 universal coupling sliding surface, crosshead, bearing shall be obliged to ensure lubrication, generally in 2 # industrial lithium base grease or 2 # molybdenum disulfide calcium base grease, under the condition of the general gas with a continuous run of 500 hours, operating two months come on time, if under the condition of high temperature work must go once a week, come on when the screw hole of the bearing face oil, Inject with high pressure oil gun until overflow.

04 coupling daily maintenance, such as found indentation and other normal wear phenomenon, should be replaced in time; The coupling is not allowed to have cracks, such as cracks need to be replaced (can be used to hammer, according to the sound judgment); During maintenance and cleaning, the cross shaft is turned 180° to achieve the alternate use of the journal force.

05 gear coupling tooth width contact length shall not be less than 70%; Its axial channeling momentum shall not be greater than 5mm.

06 GEAR coupling tooth thickness wear, the lifting mechanism more than 15 percent of the original tooth thickness, the running mechanism more than 25 percent should be scrapped, broken teeth should also be scrapped.

07 column pin coupling elastic ring, gear coupling sealing ring, if damaged aging, pay attention to timely replacement.