STM Reduction Motor RMI 63 P 1/40 Axis Core Structure Composition

NegotiableUpdate on 05/19

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STM reduction motor RMI 63 P 1/40 shaft core structure composition $r $n output shaft core structure composition $r $n shaft body main body: high-precision transmission section $r $n The shaft body main body is a * * smooth cylindrical section * *, which is the core area of torque transmission, with a diameter of φ 28mm and a tolerance level of h7 (base shaft system). It adopts * * interference fit+key connection * * with the worm gear inner hole to ensure torque transmission without slipping. The surface of the shaft body has undergone precision grinding, with a surface roughness Ra ≤ 0.8 μ m, reducing meshing friction and extending service life; The mating section (journal) between the shaft body and the bearing is treated with * * quenching and high-frequency quenching * *, resulting in high hardness

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STM Reduction Motor RMI 63 P 1/40 Axis Core Structure Composition

Core structure composition of output shaft

Main body of the shaft: high-precision transmission section

The main body of the shaft is a smooth cylindrical section, which is the core area for torque transmission. It has a diameter of 28mm and a tolerance level of H7 (base shaft system). It is connected to the worm wheel inner hole using an interference fit and key connection to ensure that torque is transmitted without slipping. The surface of the shaft body has undergone precision grinding, with a surface roughness Ra ≤ 0.8 μ m, reducing meshing friction and extending service life; The shaft body and bearing fitting section (journal) are treated with * * quenching and high-frequency quenching * *, with a hardness of HRC58~62, to improve wear and fatigue resistance.

The two ends of the shaft body are respectively equipped with * * bearing support sections * * and * * shaft extension sections * *: - bearing support section: matched with double row deep groove ball bearings, it can withstand radial loads and slight axial loads, ensuring the stability of the shaft rotation - shaft extension section: exposed to the box, used for installing couplings, sprockets and other actuating components, with keyway and positioning steps

Keyway structure: torque transmission core

The output shaft is equipped with a * * A-type flat key keyway * * (round head keyway) on one side, with a keyway size of 8 × 4mm, following the GB/T1096-2003 standard, which is a key structure for torque transmission. The keyway position is located in the middle of the shaft extension section, precisely aligned with the keyway of the worm gear inner hole, ensuring that the effective engagement length of the key is ≥ 25mm, and avoiding key breakage or slipping when torque overload occurs.

Keyway accuracy control: - Keyway width tolerance N9 (+0.030/0), forming a transition fit with key width H7, balancing assembly convenience and transmission rigidity - Keyway depth tolerance 0/-0.10mm, ensuring the depth of engagement between the key and the wheel hub, avoiding load impact caused by insufficient engagement - Keyway symmetry ≤ 0.03mm, ensuring coaxiality between the shaft and the wheel hub, reducing operational vibration

Axial end positioning structure: axial limit and installation

Double positioning structure * * is set at the shaft end to achieve axial fixation and installation guidance of the load: - Shaft end chamfer: 1 × 45 °, easy to import and assemble components such as couplings and sprockets, avoiding sharp edges scratching the mating surface - Shaft end retaining ring groove (optional)