February 15, 2021 — Before the tyre temperature of a Liebherr reachstacker reaches a critical level where tyre wear would increase excessively, the new Smart Tyre System automatically reduces the machine speed. As soon as the tyres return to a low temperature level, the power is increased again. This ensures maximum performance and protects the tyres from excessive wear.
When considering the life-cycle costs of a reachstacker, the tyres play a significant role. It is also known that overheating of the tyre is one of the main reasons for premature tyre wear. Liebherr engineers therefore took up the challenge of developing an innovative countermeasure. Customers who operate their reachstacker for more than eight hours at a time generally experience high tyre wear, regardless of which reachstacker manufacturer or tyre brand is used. The tyres tend to get very hot the longer they are used at a stretch. To prevent overheating, some customers generally reduce the speed of the reachstacker, which leads to a loss of performance and therefore efficiency.
The newly developed Liebherr Smart Tyre Saving System estimates the temperature increase of the tyre based on the axle load and the speed of the reachstacker and only reduces the speed if it is necessary. This allows the reachstacker to run at full speed until the tyres threaten to become hot. As soon as the point of increased overheating is reached, the machine is briefly throttled back systemically until the tyres have reached a temperature again that does not cause increased wear. The rider can then continue to ride at full speed.
How the system works
In several field tests, the correlation between the so-called TpKh (tonnes times kilometres per hour) value and the tyre temperature could be determined. The TpKh value relates the tyre load to the actual speed of the reachstacker and thus shows the development of the thermal tyre load. Tracking this value during operation enables a sensible reduction in speed to cool down the tyres before they reach a critical temperature. A major advantage: no additional temperature sensors are required for monitoring.
Reduces tyre wear and increases efficiency
Until now, it was common practice to generally reduce the speed of the reachstacker to avoid thermal overload of the tyre. This approach was accompanied by a general loss of handling performance. With the intelligent tyre protection for Liebherr reachstackers, a suitable solution is now available to increase handling performance and save tyre wear at the same time. The advantages are obvious. Tyre wear is reduced and thus the service life of the tyre is significantly extended. This contribution to sustainability clearly benefits the environment and also saves downtime. In addition, the short-term decrease of the machine’s power does not unnecessarily reduce the general efficiency of the reachstacker. The higher efficiency and lower tyre wear save the equipment operator a lot of money in the long run.