RELIANCE 76876-34L split spherical bronze sleeve bearing
76876-34L is a split spherical bronze sleeve bearing produced by RELIANCE Electric, belonging to the 76876 general bearing series customized for E5800 and E6800 series heavy-duty DC industrial motors. It is cast from high-density tin-lead bronze alloy with precision machined extended internal lubrication grooves and radial split structure. Compared with conventional R-type counterparts, the L version features optimized long oil groove design to hold more lubricant and adapt to dusty, high-load industrial working environments, widely used as replacement spare for worn original bearing bushes during motor maintenance and equipment retrofit.
Description
1. Product Introduction
76876-34L is a split spherical bronze sleeve bearing produced by RELIANCE Electric, belonging to the 76876 general bearing series customized for E5800 and E6800 series heavy-duty DC industrial motors. It is cast from high-density tin-lead bronze alloy with precision machined extended internal lubrication grooves and radial split structure. Compared with conventional R-type counterparts, the L version features optimized long oil groove design to hold more lubricant and adapt to dusty, high-load industrial working environments, widely used as replacement spare for worn original bearing bushes during motor maintenance and equipment retrofit.
2. Model Definition Explanation
76876 serves as the fixed base part number representing the standard outline specification of this motor main shaft bearing family for RELIANCE large DC motor platform. The figure 34 stands for specific dimensional grade corresponding to exclusive shaft and bearing housing fitting size different from 31R specification. Suffix L denotes long oil groove customized version with lengthened internal lubrication channels to enhance grease storage capacity.
3. Technical Specifications
Manufactured with wear-resistant tin-lead bronze material. Operating ambient temperature ranges from -20 degrees Celsius to 80 degrees Celsius. The maximum permissible linear rotating speed is 3.5m/s under standard lithium-based grease lubrication. Standard inner bore and outer dimension follow factory unified machining tolerance for E5800/E6800 motor installation. The lengthened inner oil groove raises internal grease storage capacity to adapt to long-cycle lubrication demand in poor site conditions. As a pure mechanical part, it has no strict restriction on environmental humidity.
4. Interface and Communication Configuration
This component is fully mechanical without any electronic terminals, signal circuits or communication modules. Its outer cylindrical surface makes interference fit with inner bore of motor bearing pedestal, and the spherical inner surface mates with motor main shaft journal. The split opening enables on-site mounting without full disassembly of motor rotor. Lubricant supplement is finished through external grease injection port on bearing housing, and no communication interface or expansion slot is available.
5. Core Functions
It bears heavy radial load from rotating motor main shaft and lowers direct metal friction relying on bronze self-lubricating property. Extended internal oil grooves reserve sufficient lubricating grease to prevent dry abrasion and journal scratching under long running periods. Split structure buffers minor shaft radial runout and operating vibration so as to protect motor shaft and bearing base from damage and mechanical locking failure.
6. Application Scenarios
It is specially matched for RELIANCE E5800 and E6800 series heavy DC drive motors, commonly installed on metallurgical rolling mill transmission units, large extruder drive systems, mine heavy conveyor main drives and oversized industrial fan prime movers. It acts as routine maintenance spare part for component replacement in metallurgy, heavy machinery, chemical and building material manufacturing industries.
7. Operation and Maintenance Instructions
Cut off total equipment power and implement power lockout before disassembly and replacement work. Thoroughly clear waste grease and surface burr inside bearing pedestal and on shaft journal before fitting new bearing. Inject high-temperature resistant lithium grease via designated oil nozzle every one to three months according to on-site dust concentration. Regularly inspect motor running noise and vibration, replace bearing immediately once abnormal conditions occur from excessive wear, and prohibit long-term over-tolerance operation of worn bearing.
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