German GMN shaft GMN model GMN price

GMN shaft is a shaft with very low rigidity, elastic and freely bendable for transmission. It is used to connect two shafts with different axes, not in the same direction, or with relative motion to transmit rotary motion and torque. It can flexibly transmit rotary motion and torque to any position. A wire bundle consisting of 4 to 5 layers of steel wire spirally wound on a central steel wire, with adjacent layers having opposite lay directions. It has a structure similar to single-strand steel wire rope, but with extremely small pitch and large lay angle, and the outer layer wires are mostly right-hand lay.

GMN shaft application

Flexible shaft is named after its use. In mechanical design, it is used as a transmission component for non-linear transmission or between non-coplanar planes. It can simplify transmission machinery while offering high transmission accuracy. It is widely used in various sectors, such as concrete vibrators, pneumatic picks, marine pumps, medical instruments, machine tool transmission devices, and automotive odometers, all of which can use flexible shafts for transmission. Additionally, flexible shafts can cushion shocks.

GMN shaft classification

Flexible shafts are divided into 3 types: wound type, universal joint type, and spring type. 1) Wound type flexible shaft: consists of a steel wire (or steel strip) shaft, a hose, and shaft connectors. The steel wire shaft is wound with 4 to 10 layers of high-carbon steel wire. The outermost layer is generally left-hand lay, and the torque is mainly borne by this layer. The shaft rotation direction should be such that this layer tightens (forward rotation); in reverse rotation, it can only bear about 15% of the forward torque. If the outer layer is tightly wound with thick steel wire, the torque capacity can be increased by 70 to 80%. The structure of the steel strip shaft is similar to that of the steel wire shaft. The hose is mostly made of formed steel strips rolled up, mainly used to store lubricant and prevent dust. Steel wire shaft connectors are used to connect two shafts, and hose connectors are used to connect the support parts of two shafts. Connectors are integrated with the shaft and hose via welding or threaded connections, available in various types. 2) Universal joint type flexible shaft: composed of many shaft joints, including ball tube joints and yoke joints, etc., adaptable to shaft bending; the more joints, the greater the flexibility. 3) Spring type flexible shaft: a long cylindrical helical spring, equipped with various tools at one end for different operations; this type of shaft does not require a hose.

GMN shaft advantages

The advantages of flexible shafts include easy installation, compact structure, ability to transmit motion and power over long distances, and ease of movement. They are mostly used for high-speed and low-torque transmission, such as driving handheld sandblasters and grinders, automotive tachometers, and starting valves and switches of certain devices. However, flexible shafts have low torsional stiffness; if there are large changes in direction and significant torque fluctuations, the unevenness of the driven end speed is also large. Under normal conditions, the power transmitted by a flexible shaft does not exceed 5.5 kW; the torque without bending does not exceed 50 N·m, and the speed can reach 20000 rpm. During use, the speed depends on the shaft diameter and the bending radius during operation. Before use, connectors must be securely fastened, and regular cleaning and lubrication are required. 1) The mandrel maintains a large contact area with the hole, resulting in higher positioning accuracy; 2) Uses the elastic deformation of the spring collet to center and clamp the workpiece, providing higher positioning accuracy; 3) The fit clearance of the positioning surface affects positioning accuracy; 4) Uses Pascal's principle to elastically deform the thin-walled sleeve for centering and clamping the workpiece, achieving high positioning accuracy with coaxiality reaching 5μm; 5) Can reduce clamping deformation of thin-walled sleeve workpieces, improving machining accuracy; 6) Has a positioning interference fit of 0.002mm, achieving extremely high positioning accuracy.

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