German Desch and Jaure couplings, Desch and Jaure models, Desch and Jaure prices

Desch and Jaure couplings are components that connect the prime mover to the driven machine. Their main function is overload protection. The torque limiter restricts the torque transmitted by the drive system by slipping when the required torque exceeds the set value due to overload or mechanical failure. It automatically re-engages once the overload condition disappears. This prevents mechanical damage and avoids costly downtime losses.

Desch and Jaure coupling introduction

They are divided into two major categories: convex and concave. Convex types are further divided into three kinds: skeletoned monolithic, boneless monolithic, and radial slit type. Their common feature is that the tire ring is connected to the two half-couplings with bolts to achieve the connection of the two shafts. The inner side of the tire ring is bonded to the steel skeleton by vulcanization. Nuts are welded at the bolt holes on the skeleton. During assembly, bolts are used to connect the flanges of the two half-couplings. Torque is transmitted by the friction generated between the tire and the flange end faces by tightening the bolts. The tire ring undergoes torsional shear deformation during operation. Therefore, tire couplings have high elasticity, a large ability to compensate for relative displacement between two shafts, and good damping. Moreover, they have a simple structure, require no lubrication, and are convenient to assemble, disassemble, and maintain.

Desch and Jaure coupling unbalance phenomena

Due to various reasons, the center of mass or principal axis of inertia of a tire coupling does not coincide with its axis of rotation. During operation, this produces unbalanced centrifugal inertial forces, centrifugal inertial couples, and dynamic deflection (vibration mode). This is called rotor unbalance. Such unbalance inevitably causes vibration in the shaft system, thereby affecting the normal operation and service life of the machine. Therefore, it must be taken seriously. To correct or minimize the unbalance of tire couplings, an appropriate balance grade should be selected as needed. After product manufacturing and installation on the machine are completed, balance is achieved on the specified balance (correction) plane of the coupling by adding or removing appropriate mass to meet the balance grade requirements. This process is called balance correction, or balancing for short. The degree of unbalance (unbalance amount U) is usually expressed by the product mr of the rotor mass m and the distance r from the center of mass to the rotor axis of rotation, known as the mass-radius product. It can also be expressed as the mass-radius product per unit mass, called eccentricity e (not eccentricity in the geometric sense). The mass-radius product mr is a relative quantity related to rotor mass, while eccentricity e is an absolute quantity independent of rotor mass. The former is more intuitive and is often used for balancing operations on specific rotors. The latter is used to evaluate the quality of rotor balance or detect balance precision. The balance grade standard for tire couplings is evaluated based on e.

Desch and Jaure coupling maintenance

1) For jaw couplings, listen for abnormal noises, or manually rotate the two half-couplings to check for excessive circumferential play. If present, the jaw rubber ring may be damaged; alternatively, check if the half-coupling is loose on the shaft. 2) For flange couplings, if the connecting bolt holes or pin holes of the two half-couplings are severely worn, the usual method is to machine the holes and fit suitable bolts, or to fill the holes by welding and then re-machine them. 3) For slider couplings, pay attention to the lubrication condition. 4) For gear couplings, inspect the tooth profile using calipers, span micrometers, or templates. If tooth thickness wear exceeds 5~30% of the original tooth thickness, replace the component. For running mechanism gear couplings, the limit is 20~30%. 5) Check that the sealing devices, retaining rings, expansion rings, springs, etc., of the gear coupling are not damaged or aged; otherwise, replace them promptly. 6) If the fit between the half-coupling or gear coupling sleeve and the shaft does not meet drawing requirements, or if there are significant scratches on the shaft due to key loosening, perform timely repairs. Generally, only the coupling or sleeve is repaired; shaft repair is not permitted to prevent shaft breakage accidents. 7) Lubricate couplings that require lubrication regularly. Slider couplings, universal couplings, chain couplings, etc., all require regular oiling and lubrication. Our company uses many universal couplings, especially in the packaging workshop.

Weidou Intelligent Technology specializes in selling German Desch and Jaure rigid couplings, Desch and Jaure flexible couplings, Desch and Jaure safety couplings, Desch and Jaure universal couplings, Desch and Jaure disc couplings, Desch and Jaure jaw couplings, Desch and Jaure flange couplings, Desch and Jaure cross couplings, Desch and Jaure slider couplings, Desch and Jaure gear couplings, Desch and Jaure tire couplings, Desch and Jaure elastic couplings, Desch and Jaure bellows couplings, Desch and Jaure roller chain couplings, Desch and Jaure spring couplings. Desch and Jaure products are original German imports. Customers are welcome to inquire and order.