Automotive Assembly Systems: Assembly Line for Axle Modules


Prior to testing the LRO, the hub and rotor must be ass […]

Prior to testing the LRO, the hub and rotor must be assembled on a test fixture complete with constant velocity. The joint and hub fasteners are then tightened according to production standard and are able to withstand an axial load of 100 kN. In order to accomplish these items the equipment had to lift the axle from the pallet prior to being secured.

Due to the rotors being unable to be retained flat against the hub, the equipment could not guarantee “non-contamination” that could potentially produce a fault during LRO. In order to correct this the “retry method” of the equipment was to remove the rotor, index to the next rotary present pattern and reinstall the rotor to the hub prior to LRO testing.

The assembly line system includes all operations, ranging from differential pre-assembly including laser welding and the main assembly of the bevel drive pinion and differential, to end-of-line testing.

As with all transfer transmissions, the qualitative focus is on the geometric adjustment of the position of the bevel drive pinion to the crown wheel, which is reflected by the noise behavior of the teeth and the life of the bearings. This can only be achieved if the relevant dimensions of the components are measured under the nominal installation conditions and the adjustment disks are correctly determined.

The adjustment disks (gradation in the hundredths range) ensure that when assembled, the components are correctly aligned with one another and that the bearings are correctly pre-stressed. The result is confirmed by means of intermediate tests (dynamic torsional backlash testing) and an end-of-line tests.


Cycle time 45 seconds

High degree of automation

Flexible number of operators

Manual workstations arranged in U-shape (lean)

2 basic types with several ratios and various housings and cover variants

Automatic feeding of wheelsets and housings

Laser cleaning, laser welding and US testing

Collar nut bolting

Dynamic torsional backlash measurement

Structure-borne noise test bench (EOL)

Semi-automatic side shaft assembly

Axle assembly facility has continuous flow assembly lines for Drive head (Differential) assembly, Axle assembly, Axle phosphating and Axle painting. Assembly lines are equipped with Electrical screwers for fastening and meeting critical torque characteristics. It has test rig for checking noise and contact patterns . Axles are tested for 100% leak proof. Axles are packed online on returnable steel pallets or wooden pallets. A separate assembly line with painting facility is available for wheel-end assembly.

Assembly lines for axles are customized turnkey special machines for the semi-automatic assembly of complete front and rear axles. Typical work pieces are axle carriers, transfer boxes, track and longitudinal beams as well as spring struts. The systems are based as far as possible on the company-owned STSpowerTrack transport system. Stations for joining, for example, by screwing and pressing are common. Setting processes are track and drop settings. Furthermore, the systems comprise all necessary feeding, concatenation and handling devices. Workpiece carriers have many workpiece carriers -specific supports and a workpiece-specific contour of the receiving plates. With the self-developed STSpowerTrack transport system with a current rail, simple and robust solutions without on-board accumulators are possible.

Wenling assembling equipment set co.,ltd. If you are interested in assembly line, please visit our official website.

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