CENTAFLEX

Highly flexible elastic couplings

Rubber couplings dampen and absorb shock and vibrations using the elasticity of rubber, while plastic couplings do the same with plastics. Their advantages include high flexibility, low noise, easy maintenance (because they do not require lubrication), simple construction, and long service life. They have been widely used in engines for construction machinery, ships, generators and the like, as well as in ordinary industrial machinery.

Application

Construction machinery/Agricultural machinery/Ships/Generators/Special-purpose vehicles/Machine tools/Inspection equipement/Wind power generators

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CF-A Models

Power is transmitted by highly elastic rubber.Rubber is excellent at absorbing vibration and shock and also reduces machinery noise. The rubber components of the elastic body are constructed of polygonal rubber with aluminum inserts inserted into their tips. Each is formed by rigid vulcanizing adhesion. These rubber bodies are coupled by bolts in the radial and axial directions of the cylindrical hub and flange hub so that power is transmitted via the rubber body. The bolt coupling in the radial direction is particular has a pre-compressed construction and enables power transmission that is excellent in flexibility and absorption of vibration and shock.

Max. nominal torque
5000 N･m
Pilot-bore additional processing range
9 mm to 130 mm
Operating temperature
-30℃ to 95℃

CF-H Models

Motive power is transmitted by polyester resin that has the elastic force of rubber.These models boast excellent vibration and shock absorption while achieving resistance to heat, cold and oil not shown by natural rubber. They can also easily engage or isolate input/output simply by moving in the axial direction, facilitating maintenance.

Max. nominal torque
2500 N･m
Pilot-bore additional processing range
13 mm to 120 mm
Operating temperature
-40℃ to 120℃

CF-X Models

These models use high-quality nylon resin for the buffer material. This construction and element material mean they are rigid in the torsion direction, have excellent flexibility in the bending and axial direction, and have no backlash. They absorb vibration and shock while delivering accurate power transmission. These models have a simple construction comprised of element (buffer material), cylinder hub, flange hub, and a bolt for locking the element in place.

Max. nominal torque
370 N･m
Pilot-bore additional processing range
9 mm to 65 mm
Operating temperature
-30℃ to 90℃

CF-B Models

Since a highly elastic resin (polyurethane/polyester) is used as the buffer material of the element, vibration and shock absorption during power transmission is excellent and noise is also reduced.The construction is a compact and simple design that sandwiches the element between two hubs, so mounting and removal is easy, facilitating maintenance of the device as a whole.

Max. nominal torque
1400 N･m
Pilot-bore additional processing range
10 mm to 80 mm
Operating temperature
-40℃to 80℃/CF-B, -40℃ to 120℃/CF-B H

CM Models

These are couplings for engines that transmit power using highly elastic rubber and are excellent at absorbing vibration and shock. They are very soft in the bending direction, and are able to escape the resonance point caused by torsional vibration at or below engine low idle.Being short in the axial direction, they do not require space and can easily engage or isolate input/output simply by moving in the axial direction, facilitating maintenance.

Max. nominal torque
18000 N･m
Pilot-bore additional processing range
11 mm to 180 mm
Operating temperature
-30℃ to 90℃

There is resonance occurring in devices run using diesel engines. Is there anyway to prevent this from happening?: If you are using an internal combustion engine (diesel engine, etc.) as your drive source, torsional resonance will occur when the natural frequency in the rotation direction of the torque transmission system as a whole coincides with the variable period of the rotational torque generated by the engine (vibration frequency dependent on rotational speed). Since occurrence of torsional resonance can damage couplings or shorten their service life significantly, it is necessary to avoid resonance points that can affect them. In general, with models with low torsional stiffness that use natural rubber-based elements, such as the CF-A and CM, the resonant rotation speed tends to be lower than low idle, while on models with high torsional stiffness such as the CF-H, it tends to be in a speed range that is higher than high idle. Any resonance point that may exist in the range of rotation speeds at which the engine is used can be shifted away from that range by changing the torsional stiffness of the coupling (accomplished by changing the type and size of coupling, the shore hardness, or the like).

What does "Pre-compressed construction" refer to for the CF-A models?

Rubber has been shown to exhibit longer life if used while compressed rather than stretched. In particular, it has been found that even with compressed rubber in general, rubber that is first compressed to a certain degree before a force is applied has a longer life than other types of compressed rubber. This type of compression in which the rubber is compressed to a certain degree is referred to as pre-compression. CF-A models are assembled with rubber parts pre-compressed. The compressed parts have a long parts life and even sections with stretching rubber parts fail to stretch until a specified torque or higher is applied.

Effects of heat on rubber couplings and coupling maintenance: When heat is applied to natural rubber, the oils on the surface of the rubber break down, which causes the rubber to lose elasticity and become hard. Although the rate and degree at which the rubber hardens varies according to the temperature, if heat is applied to a CF-A model part used within the engine housing, the surface rubber hardens. If torque is then applied to the affected section, cracks will begin to form in the hardened layer, causing the surface to break down. As part of maintenance guidelines, it is recommended that you change the rubber if the hardness increases by around 15 increments on the HS hardness scale compared to the hardness from before use.

What is CENTA-LOCK?

When the hub is attached to the shaft, it can be attached using a CENTA-LOCK mechanism. Using a clamping screw to secure the parts in place causes the spline on the clamping hub to become warped, causing the spline on the shaft to be pushed up against it to ensure that the hub and spline shaft are securely fixed in place. Although it varies depending on the size used, if the clamping screw is screwed in at the specified torque, a retaining force equal to around 1 ton per clamping screw is produced along the shaft direction. This retaining force ensures that under normal conditions the parts are securely fastened in place at an adequate level.

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