German Stuewe coupling Stuewe model Stuewe price

Stuewe couplings transmit motion by welding or bonding a thin-walled corrugated tube (bellows) directly to the two coupling halves. This coupling features a simple structure, compact dimensions, easy 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 common materials for the metal tube. Nickel tubes are produced by 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 other manufacturing methods. These thin-walled bellows give the coupling high sensitivity and rapid response, making it ideal for applications in extremely small and precise instruments.

Stuewe Coupling Introduction

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 common materials for the metal tube. Nickel tubes are produced by 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 other manufacturing methods. These thin-walled bellows give the coupling high sensitivity and rapid response, making it ideal for applications in extremely small and precise instruments.

Stuewe 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 while compensating for radial, angular, and axial misalignments. 4) Resistant to oil contamination and corrosion. 5) Torsionally rigid with identical clockwise and counterclockwise rotation characteristics. 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 micro-applications such as encoders and sensors, while the rigid series is mainly applied in servo motors and CNC machine tools (machining centers).

Stuewe Coupling Troubleshooting

Based on the coupling structure, power is transmitted from the coupling to the power output shaft (gearbox shaft) via a clamping hub assembly, and from 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. On the side with the clamping screw, the groove is open through the diameter but does not penetrate completely at the depth where it connects to the bellows, resulting in a sloped cross-section. The other groove is not open radially, but its longitudinal section at the bellows connection also does not penetrate completely, resulting in a sloped 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 exceeds the yield limit of the super-hard aluminum. According to the stress distribution diagram, once the bevel gearbox 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 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 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 functioned normally during initial testing, but as usage time increased, the cracks gradually propagated. Even under low loads, the coupling eventually failed. The presence of stress at the bonded joint is a potential hidden cause of failure. To avoid generating excessive stress when the coupling clamping collar is tightened, annular grooves are typically machined into the clamping collar for stress relief.

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