Rokee® Customized Small Precision Universal Shaft Coupling for Customers, Rokee® is a well-known high-quality supplier of couplings and technical services in China.
Small precision universal couplings as key components in mechanical transmission systems, play an important role in precision equipment, automated production lines, and instrumentation. This type of coupling, with its compact structural design and precise angle compensation capability, can effectively solve the problem of axis misalignment while ensuring the smoothness and accuracy of power transmission.
Small precision universal shaft coupling is a precision mechanical component specifically designed to connect transmission shafts with two axes at an angle. The typical characteristics of this type of coupling are small size, light weight, high precision, and the ability to achieve efficient power transmission in a limited space. According to different structures, small precision universal shaft couplings are mainly divided into three categories: single cross shaft type (WSD), double cross shaft type (WS), and expandable type (WSS), each with its specific application scenarios and performance advantages.
In terms of core structure, small precision universal couplings typically consist of two fork joints, a cross shaft, and four needle roller bearings. The fork shaped joint is made of high-strength alloy steel precision machining, and the surface is hardened to improve wear resistance; As a key component, the cross shaft bears the main transmission load and is usually made of high-quality alloy steel such as 20CrMnTi. After carburizing and quenching treatment, the hardness reaches 58-62HRC; Needle roller bearings ensure the smoothness of the coupling during high-speed operation. This structural design enables the coupling to effectively compensate for angular deviations between axes while transmitting torque.
The selection of materials is crucial for the performance of small precision universal shaft couplings. High quality alloy steels such as 40Cr, 40CrNi, 20CrMo or 20CrMnVB are the preferred materials for manufacturing key components. After appropriate heat treatment, these materials can ensure sufficient strength and good toughness. Protective covers are usually made of aluminum alloy material, which not only reduces weight but also has good corrosion resistance. For special working conditions, such as the food and pharmaceutical industry, stainless steel material can also be selected and subjected to special surface treatment to meet hygiene requirements.
The most prominent performance feature of small precision universal couplings is their precise angle compensation ability. This type of coupling allows the angle between the two axis lines to be no more than 45 °. In practical applications, it is recommended to control the working angle within 30 ° for optimal performance. Scalable type (WSS) can also provide additional axial displacement compensation, with a typical extension of 10% -15% of the total length, effectively adapting to thermal expansion and contraction or installation errors of the shaft system. The transmission efficiency of the coupling is over 99%, with almost no power loss, making it particularly suitable for applications that require high energy efficiency.
The torque transmission capability of small precision universal couplings covers a wide range, ranging from a minimum of 11.2N · m to a maximum of 1120N · m, and can meet various transmission needs from micro devices to medium-sized machinery. Taking the 3GA 3HA small expandable precision universal shaft coupling as an example, its nominal torque is 80N · m, the shaft hole diameter is 20mm, and the external dimensions are only 42mm. It is lightweight but reliable in performance. The short-term overload capacity of the coupling is usually 2-3 times the rated torque, ensuring the safety of the system under sudden impact loads.
In terms of dynamic performance, the small precision universal shaft coupling performs excellently. The allowable speed for standard models is usually between 1000-6000r/min, and for specially designed high-speed models, it can even reach 10000r/min. It is worth noting that as the working angle increases, the allowable speed will decrease accordingly. When β=45 °, the allowable speed usually needs to be reduced by 30% -40%. The dynamic balance level of the coupling can also affect high-speed performance, and the precision balanced model (G2.5 level) is more suitable for high-speed applications, which can effectively reduce vibration and noise.
Diversified connection methods are also a major feature of small precision universal couplings. According to application requirements, various shaft hole forms such as cylindrical holes, keyway cylindrical holes, and square holes can be provided. The same hole type can be used at both ends, or different hole types can be combined, such as cylindrical holes and keyway cylindrical holes, cylindrical holes and square holes, etc., providing great flexibility for equipment design. During installation, interference fit or key connection is usually used to ensure the reliability of torque transmission.
In terms of environmental adaptability, small precision universal couplings perform well. The working temperature range of the standard model is -30 ℃ to+150 ℃, and the specially designed high-temperature resistant model can be extended to -40 ℃~200 ℃; The protection level is usually IP54, and the sealed design model can reach IP65, which can effectively prevent dust and water; The lubrication system adopts a closed design, which ensures good lubrication and reduces noise. In terms of chemical resistance, couplings have good resistance to most mineral oils and fats, but long-term exposure to strong acids, alkalis, or polar solvents is not recommended.
Compared with traditional couplings, small precision universal couplings have obvious comprehensive advantages: compared with gear couplings, they have better angle compensation ability; Compared with elastic couplings, its service life can be extended by more than three times; Compared to diaphragm couplings, it allows for larger installation deviations and is easier to maintain.
Small precision universal couplings have been widely used in various industrial fields due to their excellent performance. In the field of precision instruments, it is used in the transmission system of optical equipment, measuring instruments, and laboratory equipment to ensure precise angular power transmission. After adopting the WSD type coupling, the transmission error of a high-precision measuring instrument was controlled within ± 0.01 °, greatly improving the measurement accuracy. In the field of automation equipment, this type of coupling is widely used in the transmission system of robotic arms and CNC machine tools, and its compact design is particularly suitable for installation situations with limited space.
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.
URL: https://m.rokee.com/coupling-cases/small-precision-universal-shaft-coupling.html