New product technologies for agricultural tractors, in particular with regard to electromechanical transmissions


situation characterisation of innovation potentials examination of an example -electromechanical tractor transmission- derivation of a technology application schedule

4. derivation of a technology application schedule


At the beginning of this paper further innovation potentials were derived using the component-oriented view. They can be investigated and realised in more depth in the same way. The use of some of these potentials in the near or far future can already be anticipated today. Further potentials will be opened by the ongoing technical development. For visualisation purposes and as stimulation for regular checks and extensions it is recommended to these potentials for the product tractor are sorted according to components and displayed over time in a graph. In this way one attains a technology application schedule, from which, after checking the actual occurrence or probability of occurrence, the current need for action can be derived.

Figure 12 shows an excerpt from such a schedule. It contains three axes, product, production technology and time. The product axis shows the subdivision in components according to figure 4, into which the innovation potentials are ordered according to their estimated or probable time of introduction. It is important that entries into the upper quadrant formed by the product and time axes can only be carried out if a safe production technology exists in the lower quadrant not shown here that permits production at competitive costs and with sufficient quality. This prerequisite is given for most of the innovation potentials shown here. However, in the case of the fuel cells massive exertions are currently being undertaken to fulfill them, whilst the introduction date for super-conductive components must be set at the outer limit of the viewed time-scale due to the same reasons.

Summary

Recognition and evaluation of technical innovations are basic tasks of all long-term planning processes. The rapid evolution of power and micro-electronic devices enables new product technologies for agricultural tractors. In particular, electromechanical transmissions represent an high potential range for innovations. During the past years the performance of electrical drives was greatly improved and their cost reduced considerably. Considering the technical capabilities, the substitution of power shift- and hydrostatic-transmission now seems profitable. Therefore, a basic scheme of an electromechanical transmission is presented and variations are discussed. The basic scheme has been realised in a prototype named - Eltrac -. A comparison to other transmissions is also given. Other innovations can be considered and applied in a similar manner.


Text and pictures were content of a publication at the VDI-MEG-Meeting Landtechnik '98 in Garching near Munich.


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