JPS6060035A - Agricultural tractor - Google Patents

Abstract

PURPOSE:To facilitate inspection of sensor, in an agricultural tractor where the engine torque is controlled to be lower than the setting level on the basis of information from an electric sensor for detecting the transmission torque to the power take-out shaft, by fixing the electric sensor onto the power take-out shaft. CONSTITUTION:A distorsion gauge 15 as an electric torque sensor for detecting the torque to be transmitted from a rotary shaft 8 to power take-out shaft 9 on the basis of distorsion of power take-out shaft 9 is fixed to the power take-out shaft 9 to take out the detection results of distorsion gauge 15 through a slip ring 16. In order to detect the rotation of rotary shaft 8, a rotation sensor 18 for detecting the rotation of a gear 17 integrally rotatably with the rotary shaft 8 is fixed to the case 19. Engine torque and rotation are operated by a micro computor on the basis of the input informations from the distorsion gauge 15, rotation sensor 18, etc. and provided to a controller to bring each operated level below the setting level thus to prevent engine stop caused by driving of working system.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides control that automatically operates so that the engine torque is below a set value based on 40 reports from an electric sensor that detects the torque transmitted to the power take-off shaft for the connected work device. Relating to an agricultural tractor equipped with a mechanism.

The agricultural tractor mentioned above is configured to prevent engine stoppage due to an increase in the driving load of the connected working device, but conventionally, the driving load of the traveling device may also increase, causing engine stoppage. Based on the view that it is necessary to prevent engine stoppage caused by driving the traveling gear, we installed a torque detection sensor that detects not only the torque transmitted to the power take-off shaft but also the torque transmitted to the traveling gear. The transmission branch point of the traveling gear system and the power take-off shaft system is also attached to the engine side, and this point Ffr is located deep inside the vehicle body, and there is generally a case covering the transmission structure at this point. The presence of a clutch and a clutch make it difficult to perform inspections and other work on the sensor, and the temperature inside the case rises due to heat dissipation from the clutch, causing the sensor to heat up and become more likely to malfunction.

SUMMARY OF THE INVENTION An object of the present invention is to ensure that engine stop is prevented, to facilitate inspection of sensors, and to prevent center failure from occurring.

A characteristic feature of the present invention is that, in the agricultural tractor described above, the sensor is attached to the power take-off shaft, and its functions and effects are as follows.

In other words, agricultural tractors are generally driven at low speeds during work, so the driving load on the traveling gear does not change much, and even if it does change, it does not cause the engine to stop, unlike in working equipment. We discovered that no large increase occurred, and decided to use the auto-θ sensor as the support extraction axis.
The configuration is such that the detected value is maintained below a preset value so as not to cause the engine to stop. Therefore, engine stoppage can be prevented unevenly and work can be done more efficiently.The sensor can be easily reached and placed at the end of the vehicle body away from the clutch, making it easier to inspect the sensor. We were able to do this in a way that was efficient and made it difficult for the sensor to burn out.

Embodiments of the present invention will be described below based on the drawings.

As shown in Figure 1, the rear of the agricultural tractor body @Ic,
The rotary tiller (3) is connected to the rotary tiller (3) so that it can be raised and lowered via a link mechanism (2) configured to be moved up and down by a hydraulic cylinder +11, and is also configured to transmit power from the tractor to the tiller (3). This constitutes a riding power tiller.

As shown in Fig. 2, the transmission structure for the tilling device (3) consists of an engine (4), a rotor (5), a super speed reduction device (6) for driving, and a mass speed device (7) for power extraction. ), and a power take-off 111 linked via the rotating shaft (8).
11I (9) ft, engine (4) with transmission case (10
) Connected via e and the meat speed device +61
, +71, a traveling auxiliary transmission (lυ), a traveling ultra-reduction gear H, a differential mechanism, etc. are installed inside the transmission case α (equipment), and the tilling device is connected from the power take-off shaft (9). (3).

As shown in FIG. 8, based on the torsional strain of the power take-off shaft (9), the power take-off shaft (9)
) is attached to the power take-off shaft (9), and the detection result by the strain gauge θbH is taken out via the slip ring (11). , the rotating shaft (8)
A rotation speed sensor αs configured to detect the rotation speed of a gear 97) that rotates integrally with this rotating shaft (8)° and to take out the detection result as a peripheral fluid number.
if:, the slip ring α and rotating gear (1'
? ) to the case (l), and as shown in FIG.
4) The first to eighth switches (Jla) are detected based on the operating position.

(21b) and (21c) are provided near the gear shift lever 4,
Then, the detected value of the strain gauge (15) is transmitted to the amplifier (2).
and ψ converter (2) to be output to a microcomputer, and
(The detection value of one barrel is output to the microcomputer via the F/V converter and the second converter, and the first to eighth detection switches (
The detection results of 21a), (21b), and (21c) are sent to the microcomputer (21c) via the input device.
It is configured so that it is output to (goods).

Then, the microcomputer described in IIO is operated to control the engine (4) based on the input information from the strain gauge, the rotation speed sensor α barrel, and the three detection switches (21a), (21b), and (21c). The control circuit for the control valve η of the cylinder tll automatically outputs a valve operation signal to the barrel so that each of the calculated values becomes less than the set value, and the tilling device ( 3) is configured to be operated upward, and work is performed while preventing the engine from stopping due to the drive of the tilling device (3). It is configured so that it can be used.

Control method by iQM microcomputerV To be more detailed, Tp: Detection torque by strain gauge (I@) Np: Detection torque by rotation speed sensor (l) Rotation speed a detected by barrel: Engine (4
) to the assistance take-out shaft (9): Based on mechanical efficiency, the torque Te of the engine (4) = b X Tp/a and the rotational speed Ne of the engine (4), respectively. Calculate. When at least one of Te and Ne is larger than the set value, a signal to raise the tilling device (3) is output, and when both Te and No are less than the set value, the tilling device +3) @m
It outputs a signal to stop the %.

In the above implementation configuration, in special cases such as when working in wet fields, the drive load of the traveling system changes widely, so it is necessary to prevent engine slug caused by this increase in drive load. Although the tilling device (3) is configured to be controlled up and down based on the rotation detection result, it is also possible to perform the elevation control based only on the torque detection result. YOφ0 The microcomputer configuration has a logic circuit configuration and a configuration that automatically switches the power extraction transmission (7) in order to reduce the engine torque by switching the reduction ratio to the power extraction shaft (9) to a large value. In order to reduce the amount of work per unit time of the tilling device (3) and reduce the engine torque, the configuration may be changed to a self-help switching operation of the main transmission gear for driving (6). These are collectively referred to as control mechanisms that operate on their own based on information from the torque sensor.In addition, this control mechanism is used to lower the work equipment and shift the transmission so that the engine torque is within the set range. It may be configured and implemented so that a speed increase operation is also performed.

The tilling device is equipped with a tilling device (based on the detection results of the engine torque and working depth) so that the working depth is within the set range when the engine torque is below the set value.
3) is provided with a control IIA mechanism for raising the plowing depth, and is configured so that the plowing depth is maintained constant while giving priority to preventing engine stoppage.

The rotary tilling device (3) can be changed to a trencher or the like, and these are collectively referred to as a connected working device (3).

[Brief explanation of drawings]

The drawings show an embodiment of the agricultural tractor according to the present invention, FIG. 1 is a side view of a riding power cultivator, FIG. 2 is a schematic diagram of a power transmission line,
FIG. 8 is a cross-sectional view, and FIG. 4 is a cross-sectional view of the center-length arrangement. (3)...Connection work device, (9)...
Power take-off shaft, (I6)...Torque sensor,
(Foundation)... Control mechanism.

Claims (1)

[Claims] ■ Based on the information from the electric sensor (15) that detects the torque transmitted to the power take-off shaft (9) for the connecting work device (3), the engine torque is controlled to be below the set value. An agricultural tractor equipped with an automatically operating control mechanism may be used to connect the sensor 451 to the IIJ recorder (9).
) Agricultural tractors owned by. (2) The agricultural tractor according to item 0 of the end of Patent RTN, wherein the control mechanism (to) is a mechanism for lifting the connected working device (3).