Mobile thick matter pump

Details Mobile thick matter pump Mobile thick matter pump

1999-01-19

2000-12-26

Walberg, Teresa

Pumps

Condition responsive control of drive transmission or pump...

F04B 4900

Patent

active

061649236

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of the Invention
The invention is related to a mobile thick matter pump having a drive mechanism comprising a vehicle motor and a gear box, at least one hydraulic pump for driving the thick matter pump, which pump is adapted to be coupled to a driven shaft of the gear box, if need be under interposition of a transfer gear box, as well as a speed limiter device for setting a maximum motor speed during the operation of the pump.
2. Description of the Related Art
For mobile concrete pumps it is known to use the existing motor and gear box of the vehicle to drive the hydraulic pumps. To this end, a transfer gear box is usually disposed in the drive train of the vehicle, which can be alternatively switched from a driving operation to a pumping operation. During the driving operation the driven shaft of the gear box is connected to the axle drive shafts of the vehicle by way of a direct drive of the gear box, while during the pumping operation it is switched to the hydraulic pumps. In the latter case the ratio of the gear box is chosen such that the maximum allowable pump speed is attained with the gear ratio of the gear box being a direct ratio (i=1) and approximately nominal speed of the motor. In many vehicle gear boxes the direct ratio is at the same time the highest speed ratio of the gear box and therefore corresponds to the highest gear. In principle it is possible to also pump using a lower gear. When limiting the maximum motor speed in the direct ratio to the nominal speed of the motor the maximum speed of the hydraulic pump and therefore the maximum pump capacity is not attained, though. Some vehicle gear boxes also have a speed increasing ratio (overdrive--i<1), in which the speed at the gear box output is higher than the motor speed. This is often realized by an intermediate gear or an additional gear of the gear box and serves as an economy or overdrive gear at high vehicle speeds.
During the operation of the known concrete pumps it is regarded to be disadvantageous that the speed setting in the region of the efficient nominal speed is accompanied by high noise levels and fuel comsumption.


SUMMARY OF THE INVENTION

Based on this it is the object of the invention to improve the known mobile thick matter pump such that for a given pump speed the noise emission and fuel consumption of the vehicle motor may be reduced.
The solution according to the invention is based on the idea that the gear box has at least two gear ratios, at the selection of which different maximum motor speeds are set by way of the speed limiter device. In this it is especially advantageous when depending on the chosen ratio a different maximum motor speed is allocated to two specific gear ratios, these being a direct ratio and a speed increasing ratio (overdrive). When in this case the efficient nominal speed of the motor is set to be the maximum motor speed for the direct ratio, it is expedient to reduce the maximum motor speed when switching to the speed increasing ratio, the ratio in the intermediate gear being constant, so as not to excced the maximum allowable pump speed. This makes it possible to use the optimum pump speed with a reduced motor speed and therefore less noise and fuel consumption. This is the case when the maximum motor speeds allocated to the different gear ratios are essentially proportional to their ratio.
The maximum motor speeds can be set either by mechanical or by electronic means. In the former case the speed limiter device expediently comprises an adjustable mechanical limit stop at an adjusting mechanism for controlling the fuel delivery to the vehicle motor, while in the latter case the speed limiter device may comprise a micro processor circuit for limiting the motor speed in dependence of the chosen gear ratio.
An especially simple operation is ensured when a sensor for controlling the speed limiter device, which sensor responds to a gear selector position of the gear box, is provided.
A further improvement in this respect is attained when a switching dev

REFERENCES:
patent: 5535780 (1996-07-01), Schlecht et al.
patent: 5640996 (1997-06-01), Schlecht et al.
patent: 5967756 (1999-10-01), Devier et al.

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