Rokee® Customized Cardan Shaft For Pump for Customers, Rokee® is a well-known high-quality supplier of couplings and technical services in China.
The universal joint used in pumps plays a crucial role as a key transmission component connecting the drive device and the pump body in various industrial fluid transmission systems. This specially designed universal joint not only needs to transmit torque, but also needs to compensate for installation deviations and displacement during operation, ensuring the smooth operation of the pump unit under various working conditions.
The universal joint for pumps is a power transmission device specifically designed for pump equipment, whose core function is to achieve efficient torque transmission when there is a certain angle deviation between the two shafts. This type of universal joint is usually composed of core components such as a cross shaft assembly, a telescopic spline sleeve, and a flange connection component, which achieve multi-directional compensation capability through a precise mechanical structure. Compared with ordinary universal shafts, pump universal shafts pay more attention to sealing performance and corrosion resistance in design to adapt to the humid and corrosive environment that pump equipment often faces.
From a specific structural perspective, a typical pump universal joint includes the following key components:
Cross shaft assembly: Made of alloy steel forging and treated with carburizing and quenching, the hardness usually reaches HRC58-62. The bearing part is equipped with high-precision needle roller bearings, and the friction coefficient is controlled below 0.003
Expansion spline sleeve: an engineering plastic liner with self-lubricating function, allowing axial displacement compensation of up to ± 50mm, and dynamic load capacity exceeding 80% of static load
Flange connection component: Designed according to ISO or DIN standards, the flange surface is precision machined with a flatness error of no more than 0.02mm to ensure stress free connection
The sealing system of the universal joint for pumps is particularly critical and usually adopts a multi-layer protective design:
Primary rubber lip seal prevents large particle impurities from entering
Intermediate labyrinth sealing structure blocks liquid infiltration
The internal grease chamber provides continuous lubrication and forms a pressure barrier
Some high-end models are equipped with magnetic sealing rings to enhance protection
From the perspective of material selection, there are various configurations of universal shafts for pumps according to different application environments:
Standard type: 42CrMo alloy steel body+GCr15 bearing steel cross shaft, suitable for general industrial pumps
Corrosion resistant type: 316L stainless steel body+17-4PH precipitation hardened stainless steel cross shaft, used for chemical pumps
Heavy duty: 42CrNiMoA high-strength alloy steel+surface plated with hard chromium treatment, used for mine drainage pumps
The universal joint for pumps has demonstrated various technological advantages in industrial fluid transmission systems, making it an ideal choice to replace traditional rigid connections and ordinary couplings. From the perspective of torque transmission capacity, the optimized force flow design increases the torque density of the pump universal shaft by 20-30% compared to ordinary couplings at the same size. For example, the SWC-I180A pump uses a universal joint with a nominal torque of up to 45kN · m, while a gear coupling of the same installation size can usually only reach around 36kN · m.
In terms of compensation capability, the universal joint of the pump exhibits excellent multi-directional adaptability:
Axial compensation: achieve axial displacement compensation of ± 5mm to ± 50mm through the expansion spline structure
Radial compensation: The unique cross axis design allows for a radial deviation of 0.5-3mm
Angular compensation: The single joint universal shaft can reach 15 °, and the maximum compensation when combined with double joints is 25 °
Comprehensive compensation: able to adapt to axial, radial, and angular composite deviations simultaneously
This comprehensive compensation capability is particularly suitable for the installation of large pump sets, which can effectively absorb shaft displacement caused by factors such as foundation settlement and thermal expansion, reducing the difficulty of alignment by more than 50%.
The application value of universal shafts for pumps in various pump equipment is specifically reflected in:
Centrifugal pump: absorbs axial displacement caused by pipeline stress and protects mechanical seals
Screw pump: compensates for the difference in thermal deformation between the rotor and stator, reducing vibration
Piston pump: cushioning pulsating impact, extending bearing life
Chemical process pump: resistant to corrosive media, ensuring long-term reliable operation
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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