In the assembly of core new-energy vehicle (NEV) components, the transmission is the critical link for power transfer. Because it is now tightly integrated with the motor and battery system, the housing geometry has become far more complex, creating new challenges for every bolted joint. Innovative screw-feeding and tightening technology—optimized on several fronts—has become the key to breaking this bottleneck and guaranteeing transmission quality.

The first headache in NEV transmission assembly is the “multiplicity dilemma” of bolt positions. The horizontal coordinates and spacings of holes vary widely due to the integrated e-motor/battery package, and several screws often have to be tightened at the same time. Traditional single-spindle tightening cannot cope with such layouts; asynchronous tightening easily distorts the housing, causing seal failure or drivetrain noise. At the same time, takt-time targets are becoming ever more aggressive, and low-efficiency tightening can no longer support volume production.

To solve this pain point, a multi-spindle variable-pitch synchronous tightening system, combined with “blow-and-suction” screw-feed modules, delivers a high-efficiency solution.

• The multi-spindle variable-pitch frame adjusts the distance between spindles to match any hole pattern, driving several screws simultaneously so the housing is loaded evenly; accuracy and throughput jump.

• The blow-and-suction module uses both positive air flow and negative pressure to pick up and locate every screw, avoiding interference from the crowded housing architecture. Even in the most awkward positions, stable feeding and tightening are guaranteed, and the assembly cycle is sharply shortened.

High integration also means that hole-position repeatability is easily compromised by machining tolerances. A fixed socket often misses the hole, causing cross-threading or stripped threads. Floating-socket technology answers this problem: the socket is mounted with compliant float that automatically compensates for positional deviation, raising the success rate and eliminating assembly faults caused by hole mis-location.

As NEVs move toward ever higher integration and reliability, screw-feeding and tightening technology—by solving these specific assembly problems—safeguards both transmission quality and operational durability, while helping OEMs lift productivity and cut cost. With the addition of intelligence, the tightening system can exchange real-time data with the line and adapt itself on the fly, providing still smarter and more efficient support for new-energy transmission assembly.