Duplex Bearings Market: Introduction
There are different elements in machines, bearings being one of them, which allow the movement of the machine components along each other. Bearings are an important integral part of any object, to emphasize this, bearings support sky scrapers during earthquakes by offering them some movement. In fact even human beings whose joints involve sliding contact bearings, would come to a stop if they stop working. Duplex bearings are pair of two matched bearings. The duplex bearing pair provide better shaft location with enhanced accuracy. They are also used to increase the stiffness and thereby the capacity of the bearing assembly. This also enhances the bearing position in both axial and radial directions and the load bearing capacities. The axial and radial load bearing capacity is highly increased unlike that in single bearings. These matched bearing pairs have their outer or inner rings relieved selectively by precise amount called preload offset. During installation, when the matching bearings are clamped, their offset faces come in contact thereby creating a long-lasting preload within the bearing set. These type of bearings generally have speed limits owing to the rapid heat generated due to the rigid preload. Duplexing of bearings is mainly used where there is need of predictable radial and axial rigidity. They can bear thrust loads in both directions or even in some cases they are used in applications where very heavy uni-directional thrust loads are present.
Duplex Bearings Market: Bearing Arrangements
When matched bearings are clamped and installed in axial direction, the gap is closed which results in generation of preload on these bearings. There are typical three types of duplex bearing mounting arrangements used namely, face to face bearing arrangement, back to back bearing arrangement and tandem bearing arrangement.
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Face to face bearing arrangement: it is also referred to as the X arrangement or DF arrangement. In this type, the two halves are placed in such a way that the line angle of contact of the bearing assemble in the inward direction and these lines form X shape and hence called X arrangement. This type has low moment stiffness and hence must be placed appropriately in order to provide opposition to the moment load. The speed withstanding capacity is also less owing to the fact that they can carry misalignment to a definite level only. They need higher lubrication and external arrangements to initiate cooling in order to avoid seizure of the bearings involved due to thermal expansion.
Back to back bearing arrangement: it is also referred to as DB arrangement or O arrangement. These bearings are higher moment stiffness than the DF bearings. They have higher rigidity and maximum spread. They are the most commonly used bearings.
Tandem bearings: it is also referred to as DT arrangement. In this type two halves are placed in such a way that the lines of angle of contact are parallel. This provides a heavy duty bearing arrangement but does not withstand radial load and is uni-directional load bearer. The axial stiffness is almost twice that of the face to face or back to back bearing arrangements considering the same pre load. They are usually used to carry heavy thrust loads but in one direction only.
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Apart from these types of bearing arrangements, there are other methods which are used for extreme cases such as in certain conditions where the diameter of the shaft cannot be further increased to accommodate larger bearings in order to increase load withstanding capacity and also in some conditions where increased stiffness is essential in the bearing assembly. In these situations duplex bearings are used but in sets of three or even more number of bearings to meet the requirements.
Duplex Bearings Market: Advantages
Duplex bearings are used in situations where additional capacity is essential but space is insufficient for larger bearings radially. The duplexing of bearings provide several advantages such as they can carry heavy radial loads, can withstand combined radial and thrust loads, they show excellent rigidity and can carry reversing thrust loads and moment loads. The radial displacement is also reduced to a minimum and accurate functioning is also possible. Other advantages include the ease in assembling and they have minimum run out.
Duplex bearings with face to face arrangement (DF arrangement) are used in applications where there is need for accommodation of misalignment. DT arrangement is used in applications where greater load withstanding capacity is required without increasing the size of the bearing. DB arrangement is used in applications where high moment rigidity is essential. They are used in various industries such a medical equipment, military and defence, construction equipment, robotics, recreational vehicles, oil derricks and high speed trains.
Duplex Bearings Market: Key Companies
The key manufacturers of duplex bearings include SKF Inc., RBC Bearings, Emerson Bearing, NSK, PIB Bearings Inc., and NTN Corporation.
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