JPH0130441B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a self-propelled vehicle body that is equipped with a ground work device that can be driven up and down in order to prevent engine stoppage during work due to engine overload and to facilitate work. The present invention relates to a ground work vehicle equipped with a speed regulating controller that automatically operates a transmission to maintain a detected engine load within a set range.

Conventionally, the above-mentioned ground work vehicle has been configured to maintain the engine load within a set range by only automatically converting the traveling transmission using a speed governor controller. When the work load is extremely heavy, the work travel speed becomes considerably low, and work efficiency is significantly reduced. Therefore, in such cases, the operator manually lifts and lowers the ground work equipment to adjust the ground work depth and reduce the work load on the work equipment to maintain the work travel speed at an efficient speed. The system was designed to reduce the load on the engine and prevent the engine from stopping, but the work load on the work equipment, which changes depending on the soil quality of the area where the vehicle is moving, was judged and the operator's intuition was used to control the work equipment. Because it is difficult to adjust the working depth to an appropriate level, it is not possible to maintain the running speed at an efficient speed, and the quality of ground work is significantly deteriorated.
There was room for improvement in terms of achieving both workability and work efficiency, such as the cumbersome operation of manually raising and lowering the work equipment every time the soil quality changed, resulting in a decrease in operability.

In view of the above-mentioned conventional circumstances, an object of the present invention is to make it possible to reliably maintain the working speed at an efficient speed, and to increase the ground working depth of the working device to prevent engine stop while maintaining this speed. The aim is to make adjustments easy and appropriate and to achieve both work efficiency and workability.

A characteristic configuration of the present invention is that, in the above-mentioned ground work vehicle, the controller is provided with a mechanism for setting a lower limit speed of the self-propelled vehicle body, and when the traveling speed decreases to the lower limit speed set by the setting mechanism, the load on the engine is increased. In order to maintain the detected value within a set range, a working depth controller is provided for automatically raising and lowering the ground working device above the appropriate working level with respect to the self-propelled vehicle body.

In other words, even if the lower limit value of work efficiency speed is set by the lower limit speed setter and the vehicle speed is reduced to the lower limit speed by the governor controller based on engine load detection, if the engine load becomes large, The working depth controller automatically raises and lowers the ground implement above its proper level based on engine load detection, adjusting the work load on the implement to maintain efficiency speed. Since it maintains the value within the set range and prevents the engine from stopping, it is possible to reliably maintain efficiency and speed, and it is also possible to appropriately adjust the ground working depth of the working equipment according to changing soil conditions. hand,
It is possible to maintain a good level of finish for ground work, and it is also possible to improve the operability by omitting manual operations for adjusting the depth of ground work, improving both work efficiency and workability as a whole. We have now been able to provide a ground work vehicle with extremely excellent practicality that can be improved.

Next, embodiments of the present invention will be described in detail based on illustrative drawings.

As shown in FIG. 1, a pair of left and right driving rear wheels 1
b, and a vehicle body equipped with a pair of left and right front wheels 1a for steering, a driving unit 4 consisting of an engine 2, a power transmission 3 for shifting, etc., and a passenger driving unit 5.
At the same time, a rotary tilling device 6 is connected to the rear part of the vehicle body by a hydraulic cylinder 8 via a link mechanism 7 so as to be able to be raised and lowered, and the rotary tilling device 6 is connected to the rear of the vehicle body by a power take-off shaft 9 protruding from the vehicle body.
In addition, the rotary power of the tilling claws 6a is inputted to the tilling claw 6a, thereby constructing a riding type tiller.

This tiller is configured to automatically adjust the speed and adjust the workload of the tilling device 6 according to the load in order to prevent the engine from stopping due to an increase in engine load during traveling tillage work. To explain in more detail the automatic speed regulating and work load adjustment structure, as shown in FIG.
0 and power transmission 3
A pulse motor 12 is provided in the swinging lever 11 for speed change operation, which automatically swings the swinging lever 11 by one speed to the high speed side or the low speed side depending on the positive or negative of the pulse signal with one pulse signal input, and Based on the information from the sensor 10, when the detected rotation speed of the engine 2 becomes larger than the set upper limit or smaller than the set lower limit due to a change in the engine load, the detected rotation speed is changed. A controller 13 is provided which outputs a signal to the pulse motor 12 to automatically operate the swing lever 11 step by step to the high speed side or the low speed side until the number returns to within the set range,
The system is configured to maintain the rotational speed of the engine 2 at an appropriate state through automatic speed control of the vehicle body, and to detect a rotational speed of the engine 2 that is lower than the upper limit set based on the information from the engine rotational speed detection sensor 10. In order to adjust the tilling work load of the tilling device 6 so that the detected rotation speed returns to within the set range, the height of the tilling device 6 relative to the vehicle body is adjusted so that the detected rotation speed returns to within the set range. The control valve 8a of the hydraulic cylinder 8 for raising and lowering the tilling device 6 is automatically operated while feeding back information from the swing angle detection sensor 14 of the detection link mechanism 7, and the tilling device 6 is raised in steps of a certain amount upward from its appropriate working level. A working depth adjustment controller 15 for automatically raising and lowering the gear is provided, and the shift lever 11
Then, a limit switch type sensor 16 is installed to detect when the speed regulating controller 13 automatically decelerates the tilling work to the lower limit of the tilling efficiency speed (in this embodiment, the second forward speed (F ₂ )). In addition, based on information from the limit switch type sensor 16, the link mechanism swing angle detection sensor 14, and the engine rotation speed detection sensor 10, the swing lever 11 is set to a higher speed side than the forward second speed (F ₂ ) position. (F ₃ to _{F 4} ), only the speed regulating controller 13 is activated and the working depth adjusting controller 15 is activated.
operation is stopped to maintain the tilling device 6 at an appropriate working level, and the swing lever 11 is set to the second speed (F ₂ ).
, and when the tilling device 6 is located at an appropriate working level, the regulating controller 13 is activated in response to deviations from the upper limit setting of the engine speed, and when the tiller 6 deviates from the lower limit setting of the engine speed. When the tilling device 6 is located above the proper working level, only the working depth adjusting controller 15 is activated and the speed regulating controller 13 is activated. An automatic switching controller 17 is provided to stop the operation of the swing lever 11 and maintain the swing lever 11 in the second forward speed (F ₂ ) position.

In other words, each sensor 10, 14 prevents the engine from stopping by automatically controlling the speed by keeping it within the efficient speed range and maintaining its working efficiency, and also prevents the engine from stopping by adjusting the working depth of the tilling device 6 in the efficient speed state. By making it possible to perform the tilling work automatically and appropriately using the working depth adjustment controller 15 based on information from The structure is designed to prevent significant deterioration of the speed and the drop in running speed from the lower efficiency speed limit, improve operability by eliminating cumbersome manual operations, and achieve both work efficiency and workability as a whole. It has been done.

Reference numeral 18 in the figure is a sliding friction clutch, whose sliding action allows manual operation of the swinging lever 11, and whose frictional coupling action allows the swinging lever 11 to be operated by the rotational force of the pulse motor 12.
It enables automatic movement operation of 19
is a manual selection device for setting the appropriate work level of the tillage device 6.

In order to set the lower limit speed for automatic deceleration by the speed governor controller 13, instead of installing a limit switch type sensor 16 on the shift swinging lever 11 to detect when it has been decelerated to the set lower limit speed. Then, a potentiometer-type vehicle speed sensor for detecting the swing angle of the swing lever 11 is installed, or
A sensor is installed on the axle to detect the vehicle speed by detecting the number of revolutions of the axle, and a lower limit speed setter is also installed. Specific means for setting the lower limit speed, such as stopping the automatic deceleration operation by the speed controller 13 and switching to control by the working depth adjustment controller 15, and making it possible to change the lower limit speed according to the work content. Various configuration changes are possible, and the mechanism for setting this is collectively referred to as the lower limit speed setting mechanism 16.

In addition, the setting range of the engine load is defined by setting upper and lower limits for the engine speed, and the upper and lower limits of the engine speed are changed depending on the gear shifting state of the power transmission 3 for shifting. It may be configured to do so.

Further, various configuration changes can be made to the automatic speed change operation structure of the traveling transmission 3 by the speed governor controller 13 and the automatic lifting and lowering operation structure of the working device 6 by the working depth controller 15.

The present invention is directed to various types of ground work vehicles for use in agriculture, construction, and the like.

[Brief explanation of drawings]

The drawings illustrate an embodiment of the ground work vehicle according to the present invention, and FIG. 1 is an overall side view of the tiller, and FIG. 2 is a schematic system diagram showing the engine load control structure. 2...Engine, 3...Transmission for driving, 6...
...Ground work device, 13...Speed control controller, 15...
...Working depth controller, 16...Lower limit speed setting mechanism, 17...Check mechanism.

Claims (1)

[Scope of Claims] 1. A control system for automatically operating a traveling transmission 3 of a self-propelled vehicle body to which a ground work device 6 is connected so as to be able to move up and down freely in order to maintain the detected load value of the engine 2 within a set range. The ground work vehicle is equipped with a speed controller 13, and the controller 13 is provided with a mechanism 16 for setting a lower limit speed of the self-propelled vehicle body, and when the traveling speed decreases to the lower limit speed set by the setting mechanism 16, In order to maintain the detected load value of the engine 2 within a set range, a working depth controller 15 is provided for automatically raising and lowering the ground working device 6 above the appropriate working level with respect to the self-propelled vehicle body. Ground work vehicle with features such as: 2. Claim 1, characterized in that a mechanism 17 is provided for controlling the speed change by the speed regulating controller 13 only when the ground work device 6 is located at an appropriate work level. Ground work vehicle described in .