German IPR coupling IPR model IPR price

IPR couplings contain an elastic compound with pre-compressed rubber, providing additional strength and extending service life. This coupling accommodates all types of misalignment. The hub material is high-strength aluminum alloy, which is both lightweight and corrosion-resistant. The rubber component is primarily used for vibration damping, ensuring smooth and quiet power transmission, thereby protecting the drive source and driven machinery. Installation is simple; since the rubber part is a split insert, it can be installed by insertion after shaft alignment. Elastic couplings use parallel or spiral slit systems to accommodate various misalignments and transmit torque precisely. Elastic couplings typically offer good performance and cost advantages, making them the preferred choice in many practical applications of stepper and servo systems. The one-piece design enables elastic couplings to transmit torque with zero backlash and offers maintenance-free operation. Elastic couplings mainly consist of two basic series: spiral slit type and parallel slit type.

IPR Coupling Introduction

It consists of two hubs and a thin-walled metal tube, connected by welding or bonding. Although many other materials are available, stainless steel and nickel are the most common materials for the metal tube. Nickel tubes are produced via electrodeposition. This method first involves machining a solid mandrel into a corrugated shape, electroplating nickel onto the mandrel, and then chemically dissolving the mandrel to obtain the nickel bellows. This method allows precise control of the bellows wall thickness and achieves thinner walls than those produced by other methods. These thin-walled bellows give the coupling high sensitivity and rapid response, making it ideal for applications in extremely small and precision instruments.

IPR Coupling Structure Composition

The input end of the coupling structure features a clamping collar design, where clamping screws generate preload to rigidly connect the power input shaft with the clamping collar. The output end features a taper-lock design, where tightening screws preload a cone, causing the locking sleeve to expand and fit into the inner bore of the power output shaft, forming a unified connection. The center features a bellows structure, with both ends of the bellows bonded and rigidly connected to the input and output ends.

IPR Coupling Troubleshooting

Based on the coupling structure, power is transmitted from the coupling to the power output shaft (gearbox shaft) via a taper-lock sleeve expansion, and to the power input shaft via clamping collar compression. Power is transmitted between the clamping end and the taper-lock end of the coupling through the bellows, which is bonded to the taper-lock end and the clamping collar. The fault location is at the clamping collar and the bellows. Two pre-deformation grooves are machined radially into the clamping collar, with a groove width of approximately 2mm. On the side with the clamping screw, the groove is open through the diameter but does not penetrate through to the bellows connection in the depth direction, resulting in a sloped cross-section. The other groove is not open radially through, but its longitudinal section at the bellows connection also does not penetrate through, resulting in a sloped cross-section. During clamping, the clamping screws are tightened to the specified value using a torque wrench, eliminating the clearance between the bore and the shaft through deformation of the clamping collar to achieve clamping. As seen from the cross-sectional view, due to the presence of the two pre-deformation grooves, the cross-section at this location is weaker, and deformation occurs primarily at these two pre-deformation grooves. The cross-sectional area of the pre-deformation groove on the side with the clamping screw is the smallest, making this section the weakest. Permanent V-shaped deformation marks at its end indicate that the stress at this location during clamping is significant, exceeding the yield limit of the super-hard aluminum. According to the stress distribution diagram, once the bevel gear box and main gearbox are assembled and clamped, the stress value at the bonded surface of the pre-deformation groove on the clamping screw side is 164Mpa, with a deformation magnitude of 0.027mm. During launcher operation, the coupling is subjected to alternating composite stresses, causing even greater stress and deformation at this location. If minor defects such as voids, inclusions, or flaws exist at the bonded surface during manufacturing, micro-cracks will first form at the defective areas within the region of highest stress on the coupling's bonded surface when the alternating stress exceeds the bond strength, creating a fatigue source. Due to stress concentration at the crack tip, the crack gradually propagates with increasing stress cycles and prolonged exposure to constant stress. As the crack spreads, the bonded surface is progressively weakened. When the crack reaches a certain size, fatigue failure occurs. The coupling functions normally during initial testing, but as usage time extends, cracks gradually propagate, leading to coupling failure even under low loads. The presence of stress at the bonded joint is a potential hidden cause of failure. To avoid generating high stress when the coupling clamping collar is tightened, annular grooves are generally machined into the clamping collar for stress relief.

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