JP2001173486A - Riding farmworking machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a riding farmworking machine capable of setting and controlling a suitable number of revolutions according to a speed gear stage of a transmission at the time of moving and traveling. SOLUTION: In the riding farmworking machine equipped with a working machine at a rear part thereof such as a tractor, the number of revolutions is settled according to the sped gear stage of the transmission.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a riding agricultural working machine such as a tractor having a working machine such as a rotary tilling device mounted rearward.

[0002]

2. Description of the Related Art Conventionally, a riding agricultural machine such as a tractor having a working machine such as a rotary tilling device mounted rearward is configured such that a traveling system and the working machine are driven by power transmitted from an engine.

[0003]

As described above, when the traveling system and the working machine are driven by the engine, a large-output engine for driving the working machine is mounted. At the time of traveling, the engine is driven in a low load region, so that fuel efficiency is poor. Also, in order to increase the engine load during traveling, it is necessary to reduce the reduction ratio between the engine rotation speed and the rotation speed of the axle of the traveling wheels. Since the moving speed is increased, there is a problem that there is a limit that the set ratio of the reduction ratio can be reduced. SUMMARY OF THE INVENTION It is an object of the present invention to provide a riding agricultural machine capable of setting and controlling an optimum engine speed according to a shift speed of a transmission during traveling.

[0004]

SUMMARY OF THE INVENTION In order to achieve the above objects, the present invention provides the following riding agricultural working machine. That is, in a riding agricultural work machine such as a tractor having a working machine mounted on the rear side, the configuration is such that the number of revolutions of the engine is set in accordance with the shift speed of the transmission. Further, there is provided a riding agricultural work machine characterized in that the engine speed is adjusted within a range where the vehicle speed during traveling does not exceed a certain speed.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described below based on examples shown in the drawings. FIG. 1 is a schematic side view showing a small tractor as an example of a riding agricultural working machine. This tractor raises and lowers a rotary tilling device (2) as an example of a working machine at the rear of a self-propelled traveling vehicle (1). Wearing freely.

[0006] A steering handle (3) is provided at the front of the traveling vehicle (1), and a driver's seat (4) is provided behind the steering handle (3). An engine (5) is provided behind the driver's seat (4), and a transmission section (6) is provided below and in front of the engine (5). Front wheel (7)
Is mounted via a front axle (not shown), and the rear wheel (8) is mounted via a rear axle (8a).
And then the axle (8a) is the rear axle transmission case (9)
The power from the transmission unit (6) is transmitted to the rear axle (8a) via the transmission shaft case (10) and the rear axle transmission case (9) so that the rear wheel (8) is driven. It has become.

A brake lever (12) is disposed on the left side of the steering column (11) of the steering handle (3), and a PTO clutch lever (13) is disposed on the right side. A main shift lever (14) is disposed on the left side of the driver's seat (4), and a lifting operation lever (15) for raising and lowering the rotary tillage device (2) and a rotary tillage device (2) are provided on the right side. An operation lever (16) for engaging and disengaging the clutch and an operation lever (17) for adjusting the working depth are provided. Further, a roll bar (18) having a portal shape in a front view is provided upright behind the driver's seat (4).

A PTO shaft (19) for transmitting power from the engine (5) to the rotary tilling device (2) is laid on the lower rear end of the traveling vehicle (1), and a rotary tilling is mounted on the upper rear end. A lift cylinder (20) for raising and lowering the device (2) is provided. The rotary tilling device (2) is connected to the rear of the traveling vehicle (1) by a hitch (21), and power from the PTO shaft (19) is transmitted to the transmission case (22), and the tilling claw shaft (23). , And a rotary tilling claw (not shown) is rotationally driven to perform tilling work. (24) is a rotary cover, and (25) is a rotating rear cover.

Next, the engine control mechanism of the tractor as described above will be described. As shown in FIG. 2, the tractor according to the present invention is provided with a controller (27) for electrically controlling the engine (5) rotation speed, that is, fuel injection of the engine (5).
Specifically, the controller (27) is a mission unit (6)
Detects the gear position of the main shift lever (14) provided near the left side of the vehicle, detects the operation of the accelerator lever (26), detects the rotation speed of the engine (5) associated with the operation, and injects fuel into the engine (5). It is a controller that controls the amount and the like.

In such an engine control mechanism, the controller (27) detects the shift position of the traveling stage of the main shift lever (14) provided in the transmission section (6) when the agricultural work machine moves and travels, and the shift position is determined. Of the engine (5) corresponding to (1) is set. Regarding the set value of the optimum rotation speed of the engine (5), it is optimal that the engine (5) is rotated at a low speed, that is, a gear having a small reduction ratio, and the load is high. It has been found by the present inventor that only a small amount of fuel injection is required.

Next, the relationship between the exhaust temperature and the fuel efficiency with respect to the output of the engine will be described. In order to always keep the load of the engine (5) high, the temperature of the exhaust gas discharged from the engine (5) is detected by an exhaust temperature sensor (29) provided in the muffler (28), and the detected exhaust temperature is used as a parameter. Is set as the rotation speed of the engine (5). Regarding the set value of the optimal rotation speed of the engine (5), if the exhaust temperature of the engine (5) is lower than a predetermined value, the controller (27) determines that the load of the engine (5) is too small. Thus, the engine (5) is rotated at a low speed, that is, by a gear having a small reduction ratio, to increase the load. If the exhaust temperature is higher than a predetermined value, it is determined that the load of the engine (5) is excessive, and the engine (5) is rotated at a high speed, that is, a gear having a large reduction ratio, and the load is reduced to reduce the load. Engine rotation can be obtained, and the fuel injection amount of the engine (5) can be small.

According to such a configuration, each gear position of the transmission section (6) at the time of moving, traveling, high-speed tilling, or low-speed tilling of the agricultural work machine, that is, the transmission gear or the exhaust gas of the engine (5). The temperature is detected, the gear position or the detected temperature is determined by the controller (27), a gear rotation with a small reduction ratio corresponding to the moving traveling speed is selected, and a maximum rotation speed is set within the rotation range. can do. Therefore, as compared with a conventional agricultural machine that travels with the engine (5) fully opened and the engine (5) fully opened at the time of traveling and traveling, the traveling traveling can be performed at a low engine speed, so that low noise and low traveling can be achieved. Comfortable running is obtained by vibration. Further, since the vehicle travels in the high load region where the engine load is high, the vehicle can travel with a small amount of fuel injection, and an agricultural work machine with good fuel efficiency can be obtained. Furthermore, since the controller control is prioritized, even if the operator operates the accelerator lever (26) erroneously, the rotational speed of the engine (5) will not be disturbed, leading to a reduction in the operator's labor and efficient work. can do.

[0013]

As described above, according to the present invention, in a riding agricultural machine such as a tractor having a working machine mounted on the rear side, according to the first aspect, the number of rotations of the engine corresponds to the speed of the transmission. By configuring to set
Since the vehicle can travel at a low engine speed, comfortable traveling with low noise and low vibration can be obtained. According to the second aspect of the present invention, the engine speed is adjusted within a range in which the vehicle speed during traveling does not exceed a certain speed. A farm work machine that can run and has good fuel efficiency can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic side view of a tractor.

FIG. 2 is a diagram illustrating a control mechanism of an engine.

[Explanation of symbols]

 2 Rotary cultivator 5 Engine 6 Transmission section 14 Main transmission lever 26 Accelerator lever 27 Controller

Claims (2)

[Claims] 1. A riding agricultural working machine such as a tractor having a working machine mounted on the rear side, wherein the number of revolutions of the engine is set in accordance with the speed of the transmission. 2. The riding agricultural machine according to claim 1, wherein the engine speed is adjusted so that the vehicle speed during traveling does not exceed a predetermined speed.