In a linear motion system operating with the ball screw, shaft coupling is used to mechanically connect the driving shaft and the driven shaft in different units to rotate synchronously for purpose of transmitting motion. It is designed for motion control applications that require very smooth motion and high torsional stiffness. Shaft couplings can compensate for offsets between the two shafts due to inaccurate manufacturing or installation, deformation or thermal expansion during work, and can also mitigate shocks. As a safety device to prevent excessive loads on the coupled shaft, shaft couplings play the role of overload protection. Most of the commonly used couplings are standardized. Generally, you can choose the right type of coupling according to the items and sizes. When necessary, the load capacity of the vulnerable links can be checked and calculated. When the operating speed is high, the centrifugal force of the outer edge, as well as the deformation of elastic elements, needs to be checked, and the balance calibration should be performed.
Rigid shaft coupling:
Rigid shaft couplings do not have the abilities of damping and compensating the relative displacement between the two axes, and require a strict alignment of these two rigid shafts. However, this type of coupling has a simple structure, low manufacturing cost, convenient assembly and disassembly, and easy maintenance, also can ensure high alignment of the two shafts and high transmission torque, so that there is no relative movement between the shafts. This type is widely used among the couplings.
Flexible shaft coupling:
Connect two shafts with up to 15° of misalignment. flexible shafts in high-speed, low-torque applications. They’re also better than U-joints for applications requiring precise movement and directional changes.
Flexible shaft couplings connect two shafts with a maximum misalignment of 15°. They can be divided into flexible couplings without elastic components and flexible couplings with elastic components. The former type only has the ability to compensate the relative displacement of the two axes, but it can’t buffer and reduce vibration; The latter type contains elastic elements, besides the ability to compensate the relative displacement of two axes, it also has a buffer and damping effect, but the transmitting torque is generally less than that of coupling without elastic components due to the limitation of its elastic element strength. Flexible couplings are suitable for connecting flexible shafts in high-speed, low-torque applications, and they are widely used in applications requiring precise motion and direction changes.
ISUTAMI can supply a wide range of standard ball screw and nut assembly, ball screw supports and shaft couplings in both metric and inch sizes, with specific surface treatments. We also offer custom services for any required products.