Power Tool Shaft Support Using Three-Bearing Transmission Layout

The bearing support system is segmented into multiple smaller bearings (at least three bearings including needle bearings and ball bearings) distributed along the rotational driven shaft, replacing a single large bearing. This segmentation allows achieving high rotational support precision through distributed support points while maintaining a compact overall tool size, as each individual bearing remains small.

The patent transitions from supporting the rotational driven shaft at two endpoints (one-dimensional support) to supporting it at multiple points including intermediate positions (multi-dimensional support distribution). By adding bearings at intermediate positions between the two ends, the system achieves enhanced rotational precision through distributed multi-point support without increasing the radial size of individual bearings.

Two ball bearings are merged into a single support location arranged side by side, creating a combined support unit that provides enhanced rotational precision at a specific critical position (the machining tool side). This merging approach concentrates support functionality at key locations rather than distributing it uniformly, achieving high precision without proportionally increasing overall device complexity.

The bearing configuration applies local quality enhancement by placing two ball bearings side by side specifically at the machining tool side where high rotational precision is most critical for cutting performance. This localized enhancement focuses complexity only where needed rather than uniformly across the entire shaft, optimizing the balance between precision and overall device complexity.