DE1482874A1 - Harvester - Google Patents

Description

PATENT LAWYERS * DIPL-ING-CURTWALLAO

DIPL-ING. GONTHER ΚΟ | {Τ ^ - ^ 1482874 DR. TINO HAIBACH

8 MUNICH 2, THE ^11th «

OUR MARK: 7919 - K / VM

The Sperry Gyroscope Company Limited, Brentford, Middlesex, England Keith Edgar Morgan, Sonning-on-Thames, Berkshire, England.

Harvester

The invention relates to a combine harvester. The speed, a combine harvester can be used for harvesting is usually limited by the combine harvester's threshing machine. If the combine is driven too fast during harvesting, there may be growth and density in terms of density the size and moisture content of the plants clog the drum of the threshing machine. It is then necessary to use the threshing machine partially disassemble and clear the obstruction.

In order to avoid the frequent blockages and the resulting delays in harvesting, the operator provides the combine harvester to a speed at wel- j rather, such clogging can hardly occur. For one too however, it is difficult for experienced operators to find the optimal one Adjust the speed and the consequence of this is that either the harvesting proceeds more slowly than necessary or that delays occur from time to time due to clogging of the threshing machine drum.

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It is accordingly an object of the invention to provide a control system for a combine harvester which enables is created to use the combine more effectively.

According to the invention, a combine harvester is equipped with a control system which includes means for measuring the amount on the drum the threshing machine exerted torque and a device which adjusts the speed of the baths so that the Forward speed is decreased as the threshing drum torque increases.

The torque measuring device preferably supplies an output signal, which is compared with a previously set signal which the latter represents the desired threshing drum torque. The difference signal then controls the speed of the drive wheels.

The threshing cylinder is normally driven at a constant high speed, as is the case with conventional combine harvesters a transmission is usually provided to control the forward speed of the combine, a substantial number of which of gears, e.g. eight or twelve gears, are available that allow different gear ratios to be set; In addition, a continuously variable transmission is provided, which e.g. consists of a continuously variable V-belt transmission. If the drive has such a gear, the torque signal can be used to set this gear, to adjust the speed of the drive wheels accordingly. A

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Boundary indicators can be provided to indicate to the driver if the continuously variable transmission calibrates one or the other The end position is approaching, so that it is indicated that a switchover in another corridor is expedient.

If the tractor's power transmission is hydraulic, then a signal can be used to control the setting of this 8ysteas.

Preferably, the setting of the transmission system of the tractor is arranged so that the speed changes relatively slowly according to etmnxgtvtvgmwntmxt of the threshing drum torque, and clutches are provided which disengage when the torque rises above a preset safety value, both the drive to the drive wheels and after the conveyor of the threshing drum is interrupted.

The couplings are preferably arranged so that on re-entry clutch the clutch acting on the conveying device is engaged earlier than the clutch acting on the drive wheels Coupling so that the portion of the crop that has piled up in the conveyor is processed before further grain is mowed. ■

The torque can be measured by the force on or through a pulley carrying a drive belt

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Another suitable torque measuring device, e.g. of the type with stress measurement. If the threshing drum is hydraulic is driven, then the pressure in the hydraulic drive system provides a direct measure of the torque.

Further advantages and details of the invention emerge from the following description of an embodiment example the drawing. The single figure of the drawing shows a block diagram of the control system according to the invention.

The engine 1 of the combine harvester drives the threshing drum 2 via a gear 3. A torque meter 4 is located between the gear 3 and the drum 2 switched and this torque meter can be of known type or only from a spring-loaded roller exist, which runs on a drive belt of the transmission.

The motor also drives the drive wheels 5 via a system consisting of a continuously variable transmission, e.g. a continuously variable V-belt transmission 6 and a conventional multi-step transmission 7, the individual gears of which are shifted by the driver. A clutch 8, which can be actuated hydraulically or electrically, is provided between the transmission 7 and the drive wheels 5.

For setting the desired normal running torque of the threshing drum drive an adjusting device 9 is provided. The signal supplied by this device 9 is in an adder 10 compared with the measured torque. The difference signal is then used to set the continuously variable transmission

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bes 6 is used because # is the mean value of the measured torque is held constant at a preset level. A limit indicator 11 shows the driver when the continuously variable transmission 6 has entered one or the other limit position.

The motor also drives a conveyor device 12 which transfers the harvested crop to the threshing drum. Between engine and conveyor 12, a transmission 13 and a clutch 14 are connected.

The torque measured by the torque meter 4 is fed via a threshold value stage 15 to a mechanism which disengages the clutches 8 and 14. If the torque rises above the level set by this level, both clutches are automatically disengaged immediately. When the torque falls below the response value again, the clutches can be re-engaged slowly. This can for example be effected in a known manner in that a hydraulic cylinder is used to actuate the disengaging mechanism of each clutch and that the cylinders are provided with valves which allow hydraulic flow to pass through for disengaging the clutches, needle valves controlling the escape of the fluid in the cylinder so that the clutches slowly re-engage when the fluid supply is shut off. The needle valves are arranged so that the conveyor driving clutch 14 is engaged more quickly than the clutch ₊ 8, acting on the drive wheels. This ensures that the conveyor is first started again and that the

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Grain that has accumulated in the conveyor is discharged, before cutting fresh grain starts again.

In operation, the driver selects a suitable gear of the transmission 7 and drives the combine harvester into the grain. The actual speed is within the limits of the continuously variable transmission 6 by the difference in the signals from the torque meter 4 and Adjusting device 9 adjusted so that the torque of the

Average threshing drum remains at the predetermined TPrfryfrrtgay ^ yyt. if the combine harvester encounters a section in the field where the grain grows very thick and the threshing drum is overloaded as a result, the torque increases and reduces the setting of the continuously variable transmission 6 and accordingly the speed with which the combine harvester moves forward. On the other hand, the torque decreases as the grain grows thinner, so that the combine harvester can harvest faster and travel at a faster forward speed.

despite this control the threshing drum is overloaded, as can happen when the combine harvester has a damp spot or reaches a heavily sown area of the Mdes, then the torque increases and exceeds the threshold value set by the Device 15 is set. The clutches 8 and 14 are disengaged at the same time, which causes the combine to stop and at the same time also feeds the threshing drum is interrupted with grain. After a short period of time, the clutch 14 is gradually re-engaged so that the Grain lying on the conveyor reaches the threshing drum

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and is processed by this and then the clutch 8 engages so that the grain is cut again.

Claims;

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Claims (3)

Claims: 1 Δ ß ° ft 7 Δ 1. control system for a combine harvester to control the speed, with which the combine harvester moves forward in the grain, characterized in that a device (4) generates a signal which indicates a measurement of the torque exerted on the threshing drum (2), and that a device (6) the speed of the drive wheels adjusts according to that signal. 2. control system for a combine harvester according to claim 1, characterized geke'nnzeichne t that clutches (ö, 14) are provided, which when rising of the torque are disengaged above a predetermined value (9) and the drive of the drive wheels (5) and the conveyor device (12) after the threshing drum. 3. Control system for a combine harvester according to claim 2, characterized in that that the couplings (8,14) are arranged in such a way that the coupling (14) assigned to the conveyor device is first in Intervention. 9Ü9822 / 0603