German KSB coupling KSB model KSB price

KSB couplings transmit motion by directly welding or bonding a thin-walled corrugated tube (bellows) to the two halves of the coupling. This type of coupling features a simple structure, compact dimensions, ease of machining and installation, and high transmission accuracy. It is mainly used in low-power precision machinery and control mechanisms that require compact structures and high transmission accuracy. The coupling 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 commonly used materials for the metal tube. Nickel tubes are completed using 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 can achieve thinner walls than bellows made by other methods. These thin-walled bellows give the coupling high sensitivity and rapid response, making it ideal for applications in extremely small and precise instruments.

KSB 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 commonly used materials for the metal tube. Nickel tubes are completed using 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 can achieve thinner walls than bellows made by other methods. These thin-walled bellows give the coupling high sensitivity and rapid response, making it ideal for applications in extremely small and precise instruments.

KSB Coupling Features and Applications

1) Bellows couplings are backlash-free and highly sensitive. 2) High elasticity provides better equipment protection. 3) Capable of absorbing vibration and compensating for radial, angular, and axial misalignments. 4) Resistant to oil contamination and corrosion. 5) Torsionally rigid, with identical rotational characteristics in both clockwise and counter-clockwise directions. 6) Commonly used in industrial machinery such as CNC machine tools and indexing tables. The elastic element of a bellows coupling is a precision metal bellows, available in flexible and rigid series. The flexible series offers greater elasticity and is often used in miniature applications such as encoders and sensors, while the rigid series is mainly applied in servo motors and CNC machine tools (machining centers).

KSB Coupling Troubleshooting

Based on the coupling structure, power is transmitted from the coupling to the power output shaft (gearbox shaft) via a clamping hub fit, and to the power input shaft via a clamping collar. Power is transmitted between the clamping end and the clamping hub end of the coupling through the bellows, which is bonded to the clamping hub and clamping collar. The fault location is at the clamping collar and bellows. Two pre-deformation grooves are machined radially into the clamping collar. The groove width is approximately 2mm, and the groove on the side with the clamping screw is a through-slot in the diametrical direction but does not penetrate through to the bellows connection in the depth direction, featuring a beveled cross-section. The other groove does not extend through radially, but its longitudinal section at the bellows connection also does not penetrate through, featuring a beveled cross-section. During clamping, the clamping screws are tightened to the specified torque using a torque wrench. The deformation of the clamping collar eliminates the clearance between the bore and the shaft to achieve clamping. As shown in 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 grooves. The pre-deformation groove on the side with the clamping screw has the smallest cross-sectional area and is the weakest point. Permanent figure-eight deformation marks at its end indicate that the stress in this area during clamping is significant and exceeds the yield limit of 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 interface 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 interface during manufacturing, micro-cracks will first form at the defective areas within the region of highest stress on the coupling's bonded interface when the alternating stress exceeds the bonding strength, creating a fatigue source. Due to stress concentration at the crack tip, the crack gradually propagates as the number of stress cycles increases and the duration of constant stress extends. As the crack spreads, the bonded interface 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. Even under low loads, the coupling will eventually fail. The presence of stress at the bonded joint is a potential hidden cause of failure. To avoid generating excessive stress when clamping the coupling collar, annular grooves are generally cut into the clamping collar for stress relief.

Weidou Intelligent Technology specializes in selling German KSB rigid couplings, KSB flexible couplings, KSB safety couplings, KSB universal joints, KSB disc couplings, KSB jaw couplings, KSB flange couplings, KSB cross-slide couplings, KSB slider couplings, KSB gear couplings, KSB tire couplings, KSB elastic couplings, KSB bellows couplings, KSB roller chain couplings, and KSB spring couplings. All products are original imports from Germany. Customers are welcome to inquire and place orders.