High Elastic Rubber Alloy Couplings

High elastic rubber alloy couplings apply torque range: Tkn=0.36~25kNm.It is a torque elastic composite rubber coupling, which can compensate for the axial displacement, the radial displacement and the angle of connection mechanical. There are two properties of the composite rubber are available to enable the coupling to meet the requirements of different systems.

The main components of high elastic rubber alloy couplings is hub and flange, and a disk-shaped elastic memberis installed in. Rely on the curing method to adhesive surface, the outer surface and flange using the insert tooth. This insert tooth can compensate for axial displacement due to the axial insertioncharacteristic.Coupling permits the angular displacement of 0.5 °.

The elastic member of high elastic rubber alloy couplingsis made up by compound rubber that have high quality of heat resistant, allowing the ambient temperature is 45 ℃ ~ 90 ℃. However, according to the requirements of long-life, it is important to consider a sufficiently largeside ventilation in the design.

1)         T_kN30/T_kmax30is a value when the ambient temperature at 30 ℃ (303K).when the ambient temperature at60℃ (333K):T_kN60/T_kmax60 = T_kN30/T_kmax30·0.8; when the ambient temperature at80℃ (353K):T_{kN 80}/T_kmax80=T_{kN 30}/T_kmax30·0.6.

2)         Because of the presence of damping, the vibration energy is converted to heat energy and passed in the element of high elastic rubber alloy couplings.Calculating a power loss for each harmonic and superposition according to the following formula:

=Changes torque at harmonic i times (kNm);

=dynamic torsional stiffness of coupling (kNm)/rad;

=relative resistance;=harmonic frequency;=speed (min^-1).

The total power loss P_Vthat calculated in this way should not exceed the allowable value.

P_KV30is a value when the ambient temperature at 30 ℃ (303K).when the ambient temperature at60℃ (333K):P_KV60 = P_KV30·0.65; when the ambient temperature at80℃P_KV80 = P_KV30·0.40.

3)         The dynamic torsional stiffness of high elastic rubber alloy couplings is a value when the frequency f=10Hz, ambient temperature at 30 ℃ (303K) and T_kNfluctuations at  20%.

4)         Due to the physical characteristics of the elastic element, the value of high elastic rubber alloy couplings technical parameters listed in the table to allow a 10% -20% of error.

Selection Guide of BTG High Elastic Rubber Alloy Couplings

1, Basic Selection

The selectionof BTG high elastic rubber alloy couplings must meet the requirements of formula (1).TN is the engine's rated torque in the equation (1), it means the maximum value of the average of torque Tm under stable conditions (continuous conditions, or sophisticatedconditions), its computational formula is formula (2).

1.2TN≤TKN    (1)

TN=9.55PN/n_N   (2)

WherePN is the engine's rated power,its unit is KW; n_Nis the engine'srotate speed, its unit is r/min. The unit of engine's torque TN isKN • m. TKN is coupling’s nominal torque that the continuous transmission torque allowed by couplings, its unit isKN • m, see the technical data sheet of high elastic rubber alloy couplings.

2，Torque calculation

The selection of BTG series High elastic rubber alloy couplings must be confirmed by the torsional vibration calculation. The company will provide torsional vibration calculation freely for all users. To obtain satisfactory results for you, please provide the following information:

Project Name: the name of the vessel, engine, water pump or other mechanical.

Engine: model, type, bore, stroke, the cylinder number, rated power, rated speed, the minimum stable speed, the mean effective pressure, the number of stroke, firing order, firing angle, mechanical efficiency, the length of the connecting rod, the quality of piston connecting rods for reciprocating motion component.

Gear box: model, type, reduction ratio, the inertia of input end, stiffness. Reduction gear parts of moment of inertia, stiffness reduction ratio; Double reduction part of inertia, stiffness reduction ratio; The output end moment of inertia.

Shaft: the length and diameter of the intermediate shaft, the thrust shaft, propeller shaft and tail shaft; outer diameter ,pitch diameter and thickness of the connecting flange; the diameter, leaf number, pitch, solidity, moment of inertia, weight, material etc. of the propeller.

Engine: model, type, rated power, shaft speed, efficiency, the rotary inertia of the rotor, shaft diameter and length.