- Assess tire-assembly assistance over the complete cycle, including pickup, lifting, alignment, placement and return.
- Tooling can act at the center bore, outer circumference, tread or underside. Protect cosmetic surfaces and valve stems.
- The manipulator supports the weight while the operator provides guidance, rotation and stud alignment.
- Verify the compatible range of diameter, width, weight, offset and alignment orientation.
Installing a tire and wheel assembly on the line involves picking from a rack or conveyor, lifting, flipping or bringing upright, approaching the wheel end, aligning the holes, pushing onto the studs, releasing and returning. Assess manual burden by recording not only weight but also holding at a distance, rotational alignment and cycle repetition.
01Sources of manual handling effort
- Bending, leaning or twisting when picking up tires from low racks.
- Sustained support at wheel-end height while aligning the holes.
- The workpiece is moved away from the body, and the arms and lower back bear greater torque.
- Rotating the assembly to align holes while controlling axial position.
- Different vehicle heights, tire sizes and cycle times requiring different movements.
Evaluate the retrofit over the complete pick—align—release cycle. Check load support, posture and repetitive movements separately, translating the stages requiring assistance into gripper and layout requirements.
02Common tooling types
| Tooling type | Contact location | Application and considerations |
|---|---|---|
| Center-bore internal expansion | Wheel center bore | Clear positioning; need to confirm aperture range and contact protection |
| External clamping | Tire tread or sidewall | Adapt to a certain diameter range; avoid local indentation and slippage |
| Support from below | Underside of the tire | Direct support; prevent sliding out during turning and steep orientations |
| Combined tooling | Support + stops or clamping | Stable retention; account for tooling weight and operating clearance |
Keep contact parts away from valve stems, balance weights, cosmetic wheel surfaces and other vulnerable areas. For multiple models, compare outside diameter, width, weight, center bore, offset and assembly direction together. Do not define compatibility by outside diameter alone.
03Equipment supports the load; operators guide it
The equipment supports the tire weight during picking, lifting/lowering and alignment, while the operator provides horizontal guidance, axial insertion and fine angular adjustment. Configure end-effector degrees of freedom for the actual alignment movements while retaining orientation stability. Too few can cause binding; too many can cause swinging.
Involve actual shift operators in sample commissioning to check starting force, drift after stopping, rotation and fine axial adjustment. Adjust and verify gripper weight, center-of-gravity offset and joint friction together with the feel of stud alignment.
04Reduce unnecessary movement through layout
Plan a short, clear path between the pickup point, mounting center and wheel-end assembly point. Avoid operators walking backward with their backs to the vehicle, crossing conveyors or walking beneath the arm. Rack height and openings must allow gripper approach; verify empty-rack, full-rack and replenishment states separately.
If the vehicle moves with the line, check stopping accuracy, height variation and the usable operating window. Establish repeatable assembly positions through process timing and line interfaces. Do not extend the arm to chase a moving target.
05Compatibility across tire sizes
- Create diameter, width, weight, center bore and hub offset matrices.
- Define adjustment scales, locking and position detection for adjustable tooling.
- When the difference is obvious, use quick-change contact modules and set model error-proofing.
- Verify clamping, lifting, rotation, alignment and release per specification.
- Include infrequent variants such as winter tires, spare wheels and special wheels in the compatibility assessment.
06Safety design requirements
Confirm clamping or support before lifting, and confirm that the workpiece has reached the wheel end or a safe support before release. Set motion constraints for vehicle, conveyor and personnel restricted areas, and check the risk of hoses, handles and grippers snagging on the body, racks or studs.
After air or power loss, retain the load and unload it under control as designed. For suspended and intermediate alignment positions, specify withdrawal and support steps in the operating instructions. Do not rely on personnel continuing to hold the workpiece.
07Verify cycle time and ergonomics together
| Verification Item | Checks | Target |
|---|---|---|
| Complete cycle time | Complete cycle from pickup to return | Consistent completion within the process window |
| Operating posture | Bending, reaching, twisting and sustained support | Meaningful reduction in unfavorable postures |
| Alignment feel | Starting force, rotation, axial fine adjustment and drift after stopping | Controllable, consistent operation |
| Specification coverage | Smallest, largest, heaviest and special sizes | All variants pass within the declared operating range |
| Abnormal-condition recovery | Insufficient gripping, energy loss or vehicle not in position | No hazardous releases or forced assembly |
Tire assembly designs divide responsibility between equipment load support and operator guidance, configuring the gripper, degrees of freedom, layout and variant management together. Acceptance records should include the complete cycle time, alignment feel, operator posture and abnormal withdrawal to confirm improvement in repetitive supporting and lifting.
