Torque Transmission Shaft

The torque transmission shaft is a critical rotating component within brake/drive units that transfers torque from the power source (such as an electric motor or engine) to the braking or driving mechanisms. It serves as the mechanical link that enables controlled power transmission while withstanding torsional stresses and maintaining alignment between connected components. This shaft is typically manufactured from alloy steel or carbon steel, with material grades such as 42CrMo4 or equivalent, ensuring adequate strength and durability. The shaft's design parameters include a rated torque range of 150–300 N·m, a shaft diameter of 25–40 mm, and a length of 200–350 mm, with custom lengths available upon request. Torsional stiffness ranges from 1.5–2.5 kN·m/rad, and surface hardness is induction hardened to 50–60 HRC. Tensile strength is specified at 800–1000 MPa, with yield strength at 600–750 MPa. Concentricity is critical for high-speed rotation, with a tolerance of 0.02–0.05 mm, and surface roughness is maintained at 0.4–0.8 µm Ra. The operating temperature range is -40 to 85°C, and the weight varies between 3.5 and 6.0 kg depending on length and diameter. These values are reference ranges that must be verified for the specific model and application. The shaft connects to other components through couplings, splines, or keyways, ensuring synchronized rotation while accommodating minor misalignments and absorbing vibration through its material properties and design features. Standards such as ISO 1940, ISO 286, ISO 18265, ISO 6892, ISO 1101, ISO 1302, and ISO 16750 are referenced for verification and procurement purposes, but do not imply certification or compliance. Always confirm model-specific values and standards with the legal manufacturer or supplier.

The shaft rotates under applied torque, transmitting rotational force through its length via shear stress in the material. It connects to other components through couplings, splines, or keyways, ensuring synchronized rotation while accommodating minor misalignments and absorbing vibration through its material properties and design features. The shaft's torsional stiffness and material strength determine its ability to resist deformation under load. Proper alignment and surface finish are essential to minimize wear and fatigue. The shaft operates within a specified temperature range and must be selected based on the torque and speed requirements of the application. Exceeding the rated torque may cause permanent deformation, so operational limits must be respected.