Self-propelled device for milling road surfaces

Abstract

The invention relates to a self-propelled device for milling road surfaces with a vertically adjustable chassis, which carries a steerable travelling mechanism with at least one steering wheel and a rear pair of wheels with individual wheel drives and a drive unit for them and for driving a milling unit which is coupled to the drive unit and comprises a milling roller which extends transversely to the travelling direction, has a width smaller than the width of the device and is arranged off-centre with respect to the device, the traction of at least one wheel being modified in a way corresponding to at least partial compensation for the moment acting about the vertical axis of the device during milling.

Description

FIELD OF THE INVENTION [0001] The invention relates to a self-propelled device for milling road surfaces. BACKGROUND OF THE INVENTION [0002] In the case of small devices for milling road surfaces, known as compact millers, the milling unit is usually arranged flush with one side of the device and at a distance from the other side of the device, since it has a relatively small width in comparison with the width of the device, corresponding for example to half the width of the device. Accordingly, the force applied to the device is offset considerably from the middle. This offset creates a moment about the vertical axis of the device. This has the effect that the device has the tendency to be forced out of line during the milling operation. This can be compensated by constantly steering against it. However, this leads to a corresponding operating effort and wearing of the tyres. [0003] It is also known to alleviate this problem by providing a swinging-out rear wheel on the side on whi...

AI Technical Summary

Benefits of technology

[0004] An object of the invention is to provide a device for milling road surfaces with which the tendency of the device to be forced out of line during the milling operation is at least significantly reduced or eliminated in a simple way.

[0005] The invention therefore relates to a self-propelled device for milling road surfaces with a vertically adjustable chassis which carries a steerable travelling mechanism with a front and a rear pair of wheels with individual wheel drives and a drive unit for them and for driving a milling unit which is coupled to the drive unit and comprises a milling roller and a milling gear mechanism for it, the milling roller extending transversely to the travelling direction, having a width smaller than the width of the device and being arranged off-centre with respect to the device. In such a device, the traction of at least one wheel is modified in a way corresponding to at least partial compensation for the moment acting about the vertical axis of the device during milling. This consequently allows a distribution of the tractive forces on the individual wheels to be prescribed, to be precise in such a way that the moment produced during the milling operation about the vertical axis of the machine is at least partly compensated and the straight-running of the device is correspondingly improved, even under high milling loads.

[0006] In particular, a very simple solution is obtained if at least one of the individual wheel drives has hydraulic axial piston motors connected in parallel, an adjusting device for the traction of the associated wheel, with which the distribution of the tractive forces is influenced in a way corresponding to the at least partial compensation of the moment acting about the vertical axis of the device during milling.

Problems solved by technology

However, in these cases the different traction of the wheels is retained during the transporting operation of the device, so that straight-running is adversely affected during the latter.

Since the transporting distances to be covered by the device are small, however, this is of minor significance.

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