Selection guide for double row tapered roller bearings
1. Clarify application requirements
Load type and size:
Double row tapered roller bearings are suitable for bearing the combined action of radial load and bidirectional axial load.
It is necessary to clarify the maximum radial and axial loads that the bearing can withstand in order to select the appropriate bearing size and load-bearing capacity.
.Speed requirements:
Based on the operating speed of the equipment, the maximum speed of the selected bearing should be higher than the actual operating speed. It is usually recommended that the actual operating speed be less than 30% to 50% of the bearing's maximum speed.
.Lubrication and cooling methods of bearings should be considered in high-speed applications to prevent bearing overheating.
Working temperature:
Under normal load and lubrication conditions, the allowable working temperature for double row tapered roller bearings is usually between -30 ° C and+150 ° C. If the working temperature exceeds this range, special materials or lubrication methods should be selected for the bearings.
Installation space and limitations:
Choose the appropriate bearing size and structural form based on the installation space of the equipment.
. If the installation space is limited, consider choosing narrow or extra narrow series bearings.2. Choose bearing structure
Double row tapered roller bearings:
According to the number of roller rows, double row tapered roller bearings can be divided into standard type and reinforced type.
. Reinforced bearings have higher load-bearing capacity and rigidity, making them suitable for heavy-duty or high-speed applications.Sealing and lubrication methods:
Choose the appropriate sealing method (such as no seal, single lip seal, double lip seal, etc.) and lubrication method (such as grease lubrication, oil lubrication, etc.) based on the working environment and lubrication conditions.
. Sealed bearings can prevent dust and moisture from entering the interior of the bearing, extending its service life.Retainer material:
Retainer materials usually include steel plate stamping, brass solid, nylon, etc. Select the appropriate retainer material based on the speed, load, and temperature conditions of the bearing.
III. Determine bearing size and accuracy level
Bearing size:
Select appropriate bearing inner diameter, outer diameter, and width dimensions based on the equipment's shaft diameter and installation space.
. Ensure that the fit dimensions between the bearing, shaft, and bearing seat meet the design requirements.Accuracy level:
Select the appropriate bearing accuracy level according to the rotation accuracy requirements of the equipment.
. Usually, ordinary machinery can use bearings with zero tolerance; For high-precision machinery with strict requirements for rotational accuracy, P6X, P5 grade or higher precision bearings should be selected.Fourth, consider clearance and preload
Working clearance:
Appropriate working clearance has a significant impact on the service life and performance of bearings.
. During the installation process, it is necessary to measure the internal clearance of the bearing in real time to ensure that it obtains appropriate working clearance or preload.Pre tightening method:
For applications that require increased rigidity, pre tightening can be used to install bearings.
. The preload should be reasonably determined based on the load, speed, and temperature of the bearing to avoid excessive preload causing increased friction and temperature rise in the bearing.Fifth, Brand and Supplier Selection
Brand Reputation:
Choose bearing manufacturers with good brand reputation and credibility to ensure the quality and reliable performance of bearings.
.After sales service:
Understand the supplier's after-sales service policy and technical support capabilities in order to obtain timely technical support and maintenance services during use.
.Cost effectiveness:
On the premise of meeting equipment performance requirements, considering factors such as bearing price, service life, and maintenance costs, select bearing products that are cost-effective.
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