JPH0882363A - Gear shift operation device for working vehicle - Google Patents

Abstract

PURPOSE: To perform work running at a car speed proper to a work content by providing a first gear shift operation part wherein each gear shift position is set to a car speed responding to a work content and a second gear shift operation part to increase and decrease in a car speed in each gear shift position of the first gear shift operation part. CONSTITUTION: A steering column 1 erected in the driver cab of a vehicle for a work, such as an agricultural tractor, has a steel wheel 2 attached to the upper part thereof. A manual car speed set type gear shift operation part 3 is fixed below the steering wheel 2 and to the left part of the steering column 1 and a gear shift operation part 18 being of a type where a car speed is set classified by a work content is fixed to the right part thereof. A forward button 4 and a reverse button 5, the high and low speed switching button 6 of an auxiliary transmission, and a neutral button 7 are disposed to the gear shift operation part 3. Meanwhile, a first gear shift operation part to which a car speed selection button classified by a work content is attached and a second gear shift operation part to which an accelerating/decelerating switch is attached are disposed to the gear shift operation part 18.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gear shift operating device for a work vehicle on which an agricultural working machine or the like is mounted.

[0002]

2. Description of the Related Art A conventional gear shift operation device for a work vehicle, for example, an agricultural tractor, comprises a plurality of main gear shift operating parts and a plurality of sub gear shift operating parts, and both gear shift operating parts are provided at arbitrary shift positions. It was configured to operate to shift gears.

[0003]

In a work vehicle, since the load received by the work machine changes depending on the work content, it is necessary to carry out work traveling in an appropriate vehicle speed range according to the load. For example, in an agricultural contactor, a plowing work by a rotary tiller and a scraping work by a scraping work machine have an appropriate vehicle speed range corresponding to each work. Here, in the conventional device, the operator checks the vehicle speed table that displays the optimum vehicle speed and the gear shift position for each work content, and based on the confirmed vehicle speed, the operator selects the main gear shift operation unit and the sub gear shift operation unit. It was operated to shift to the optimum vehicle speed. Therefore, you may forget to check the vehicle speed chart for each work content, or forget the confirmed vehicle speed, and you may be traveling at a vehicle speed that is too slow or too fast, which improves work efficiency. In some cases, it could not be achieved, or an excessive load was applied to the working machine, causing an engine stall.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a first gear shift operation portion in which each gear shift position is set to a vehicle speed according to the work content, and each of the first gear shift operation portion. A shift operation device for a working vehicle, comprising: a second shift operation unit capable of increasing or decreasing the vehicle speed at a shift position.

[0005]

According to the present invention, the gear shift operating device for a working vehicle shifts to an appropriate vehicle speed according to the work content by operating the first gear shift operating portion according to the work content.
Furthermore, by operating the second speed change operation unit in accordance with the soil quality, slope, etc. of the field, the vehicle speed selected by the first speed change operation unit can be accelerated or decelerated, and the optimum vehicle speed can be adjusted.

Therefore, it is possible to carry out work traveling at a vehicle speed suitable for the work content, and improve work efficiency.
It is possible to prevent the engine from stall due to an excessive load acting on the work machine. Further, the vehicle speed can be increased / decreased on the basis of an appropriate vehicle speed for the work content, and the vehicle speed can be adjusted to an optimum vehicle speed according to the soil quality and slope of the field, and the operability is good.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described in detail below with reference to the drawings. First, as shown in FIG. 1, a steering wheel 2 is pivotally mounted on an upper portion of a steering column 1 which is erected in a driver's cab (not shown) of a working vehicle, and below the steering wheel 2. A manual vehicle speed setting type speed change operation portion 3 is fixed to the left side portion of the steering column 1, and a vehicle speed setting type speed change operation portion 18 for each work content is fixed to the right side portion. It should be noted that the mounting position of the shift operation portion should not be limited to the present embodiment, and may be any position that can be easily operated during driving operation, for example, on the dashboard.

The manual vehicle speed setting type gear shifting operation section 3 is
The forward button 4 is arranged above the left side of the upper surface, and the backward button 5 is provided below the forward button 4. Next to the buttons 4 and 5, a high / low speed switching button 6 and a neutral button 7 of the auxiliary transmission are arranged vertically. The speed change buttons 8, 9, 10, 11 are displayed on the right side of the operation unit 3 vertically and horizontally so that the numbers corresponding to the respective speed change gears are displayed to form the operation unit 3.

Then, as shown in FIG. 2, the signal output from the gear shift operating portion 3 is input to the CPU 12, and the CPU 12 makes a judgment and calculation, and then the main transmission 1
3 and hydraulic mechanisms 15 and 16 provided in the auxiliary transmission 14. Then, the hydraulic valves of the hydraulic mechanisms 15 and 16 are operated to shift to the gear corresponding to the signal from the operation section 3.

Now, the determination program of the control unit incorporated in the CPU 12 will be described with reference to the flowchart of FIG. It is determined whether the shift signal input by the button on the operation unit 3 is a signal issued from a single button or a composite signal from a plurality of buttons in step. Then, if the signal is a single signal, a gear shift command is output to the gear shift mechanism to perform a gear change. If the signal is a composite signal, it is sent to a step to determine whether the composite signal contains a neutral signal. Therefore, if the signal is a composite signal of the neutral signal and other shift signals, only the neutral signal is output in step to operate the shift mechanism, the shift gear and the drive shaft are separated, and power is transmitted. I don't know. Therefore, when the vehicle is stopped, the neutral signal can be transmitted to the speed change mechanism unit to stop the vehicle even if the neutral button is mistakenly pressed and the neutral button and another speed change button are simultaneously pressed. . If the composite signal does not include the neutral signal, an error occurs and the signal is not output to the transmission mechanism unit. That is, even if a plurality of shift buttons are pressed at the same time, there is no possibility that a shift signal is not output and the shift gear is erroneously changed to a high-speed shift gear to suddenly increase the speed.

Further, as shown in FIG. 4, it is determined in step whether the shift signal output by the button operation of the operating portion is a single signal or a composite signal, and the single signal remains as it is. Then, the composite signal is output to the low-speed priority output circuit of the step. The low-speed priority output circuit is programmed with a priority order of neutral, first speed, second speed, third speed, and fourth speed. For example, when the third speed and fourth speed buttons are simultaneously pressed, a third speed shift signal is output. The neutral signal is output when the neutral and third speed buttons are pressed. Therefore, when a plurality of buttons are pressed at the same time, the gears on the high speed side are not changed and the safety of the driving operation is ensured.

The work speed setting type speed change operation unit 18 is provided with a first speed change operation unit provided with work speed based vehicle speed selection buttons 17, 17, ..., A speed increasing switch 19 and a deceleration switch 20. A second gear shift operation unit is provided. The vehicle speed selection buttons 17, 17 ... are used for rotary, loader, plow,
Vehicle speed selection buttons for cutting grass, scraping, running on the road, etc. are arranged, and programmed so that the shift position corresponds to the optimum speed for each work content. Further, on the right side of the vehicle speed selection buttons 17, 17, ..., there are provided a speed increasing switch 19 and a speed reducing switch 20 for speed adjustment in order to cope with speed changes due to soil properties, slopes, etc.
It is possible to change the stage. Therefore, conventionally, the optimum speed is confirmed by the vehicle speed table according to the work content and the predetermined speed is obtained by operating the speed change lever. However, by operating the vehicle speed selection buttons 17, 17 ... be able to.

[Brief description of drawings]

FIG. 1 is a perspective view of a shift operation unit.

[Fig. 2] Illustration of the transmission system

FIG. 3 is a flowchart of a control device

FIG. 4 is a flowchart of a control device

FIG. 5 is a front view of a shift operation unit.

[Explanation of symbols]

 17, 17 ...: Vehicle speed selection button 19, 20: Acceleration switch, deceleration switch

Claims (1)

[Claims] 1. A first gear shift operation unit in which each gear shift position is set to a vehicle speed according to the content of work, and a second gear shift operation unit capable of increasing or decreasing the vehicle speed at each gear shift position of the first gear shift operation unit. A gear shift operation device for a work vehicle characterized by the above.