Rokee® Customized SWC100 Universal Coupling for Customers, Rokee® is a well-known high-quality supplier of couplings and technical services in China.
As the main model in the cross axis universal coupling family, SWC universal coupling has become an indispensable key component in modern heavy machinery transmission systems due to its innovative integral fork head bolt free connection structure and excellent angular compensation capability. This type of coupling is specifically designed for harsh working conditions such as high torque transmission, high-speed operation, and complex shaft system deviation compensation. Through a precise cross axis structure and optimized force flow transmission path, it achieves efficient and reliable power transmission.
The SWC universal coupling belongs to the category of cross axis universal coupling, and its revolutionary design lies in the use of an integral fork structure that completely abandons the traditional bolt connection method. This innovation increases the load-bearing capacity of the coupling by 20-30% compared to traditional structures under the same external dimensions, while eliminating the risk of bolt loosening or breakage. The core structure consists of an integral forged fork head, a high-precision cross shaft assembly, and a specially designed bearing system, forming a highly reliable torque transmission path.
From a specific construction perspective, the SWC universal coupling includes the following key components:
Integral fork head: Made of 42CrMo alloy steel forged as a whole, with a hardness of HB220-250 after quenching and tempering treatment. The coaxiality of the fork head ear hole is controlled within 0.02mm
Cross shaft assembly: made of 20CrMnTi carburizing steel, with a surface hardness of HRC58-62 and a core toughness of HRC30-35. The roundness error of the bearing position is ≤ 0.005mm
Needle roller bearing system: Each set of bearings contains 60-100 precision needle rollers, matched with special contour bearing sleeves, with a friction coefficient as low as 0.003
Sealing device: Multi layer labyrinth seal combined with high-temperature resistant grease, ensuring 10000 hours of maintenance free operation
The working principle of SWC coupling is based on the universal coupling effect of the cross axis: when there is an angle between the two axes, the cross axis compensates for the angle deviation through self rotation, while relying on the precise fit of the needle roller bearing to achieve smooth torque transmission. Unlike ordinary couplings, the unique feature of SWC type lies in its three-dimensional motion adaptability - a single universal coupling can achieve angular compensation of 15 ° -25 °, and the compensation ability can reach 40 ° -45 ° when double joints are connected in series. This characteristic makes it particularly prominent in equipment with significant foundation settlement, such as metallurgical rolling mills.
From the perspective of materials and processes, the manufacturing technology of modern SWC universal couplings has achieved significant breakthroughs:
Forging technology: Closed die forging is carried out using a 10000 ton hydraulic press, with complete metal flow lines and continuous fiber structure
Heat treatment process: computer-controlled carburizing and quenching production line, with the depth fluctuation of the infiltration layer controlled within ± 0.05mm
Precision machining technology: Five axis linkage CNC machine tool ensures bearing position accuracy, surface roughness Ra ≤ 0.4 μ m
Dynamic balance standard: According to G2.5 balance level, residual unbalance ≤ 1g · mm/kg
It is worth noting that the main difference between SWC type and SWP type is the fork structure - SWC adopts a monolithic design, while SWP uses a split structure. Under the same specifications, the fatigue life of SWC type is extended by 30-50% compared to SWP type, making it particularly suitable for long-term continuous operation in heavy-duty situations. This difference makes SWC type the preferred choice in industries with high reliability requirements such as metallurgy and mining.
SWC universal couplings have demonstrated various technological advantages in the field of heavy-duty transmission, making them an ideal choice to replace traditional gear couplings and elastic couplings. From the perspective of torque density, the optimized force flow design increases the torque capacity of the SWC type by 15-20% compared to gear couplings at the same rotational diameter. For example, the nominal torque of SWC350 type coupling can reach 45kN · m, while gear couplings of the same size usually can only reach around 38kN · m.
In terms of dynamic performance, SWC universal couplings have the following outstanding features:
Angle compensation: The single section compensation capability can reach 15 ° -25 °, and the maximum compensation when double sections are connected in series is 45 °
Transmission efficiency: up to 98-99.8%, 3-5 percentage points higher than gear couplings
Speed adaptation: The standard model allows a speed of up to 3000r/min, while the high-speed model can reach 5000r/min
Vibration control: Precise dynamic balancing ensures vibration intensity<2.8mm/s (ISO 10816-3 Class B)
The environmental adaptability of SWC couplings is also commendable:
Temperature range: -30 ℃ to+150 ℃ (special design can be extended to -50 ℃~+200 ℃)
Protection level: standard IP65, optional IP67/IP68
Corrosion resistance: Stainless steel models have passed a 2000 hour salt spray test
Maintenance free design: Long term lubrication system ensures that no lubricant needs to be replenished throughout the entire life cycle
Compared with similar products, the economic advantages of SWC universal coupling mainly lie in three aspects:
Low installation cost: The alignment requirements are relatively loose, and the radial deviation is allowed to reach 0.5mm
Easy maintenance: The integrated design reduces maintenance points, and only requires checking the sealing status on a daily basis
Long lifespan: Under standard operating conditions, the service life can reach 5-8 years, which is twice as long as that of gear couplings
SWC universal couplings have developed a complete model system, forming seven series of products according to different intermediate shaft structures and connection forms, to meet the special needs of various industrial scenarios. Understanding these model classifications is crucial for proper selection.
The basic series constitutes the core product line of SWC universal couplings, including two main designs:
BH type (standard telescopic welding type): using spline telescopic sleeve and welded fork head, axial compensation can reach ± 50mm
BF type (standard telescopic flange type): flange connection design, easy to disassemble and maintain, suitable for frequent maintenance occasions
The special structural type is developed for specific working conditions and includes five professional designs:
DH type (short telescopic welding type): Compact design, axial compensation ± 20mm, suitable for space limited occasions
CH type (long telescopic welding type): designed with an ultra long intermediate shaft, with a compensation of ± 150mm, used for long-distance transmission
WH type (no expansion welding type): Fixed length design, highest torque density, suitable for precise transmission
WF type (no expansion flange type): flange connected non expansion model, easy to align and adjust
WD type (non retractable short type): ultra compact design, with a length 30% shorter than the standard type
Over the years, with excellent quality, we have been continuously providing many coupling products of various categories and uses complying with multiple standards and a full range of services, from the product selection to final installation and operation, for the industry fields of ferrous metallurgy, nuclear power, gas turbine, wind power, ropeway construction, lifting transportation, general equipment, etc. We strictly comply with quality system requirements and implement the whole process control to become a reliable and trustworthy partner of customers.
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