JPS6220924B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a shift position display device for a transmission installed in a power agricultural machine such as a tractor.

In general, power agricultural machines such as tractors have multi-stage and complex transmission mechanisms in order to achieve a wide range of running speeds, from high-speed running on the road to ultra-low speed running when digging trenches. ,
Levers for switching and operating this complex transmission must be provided according to the number of transmissions. For example, three sets of transmissions, a main transmission, a sub-transmission, and an ultra-low speed transmission, must be installed in series. Powered agricultural machinery requires three speed change levers, and it is difficult for workers to operate these levers to obtain the optimal speed for each task unless they are highly skilled workers. It is.

The present invention solves the above-mentioned inconvenience, and provides a shift display device for a transmission device that can be easily operated by anyone, and that can obtain the most suitable number of gears for one task selected from a wide variety of tasks. We aim to provide the following.

For this reason, the present invention has taken the following technical measures.
That is, in a power agricultural machine having at least two sets of transmissions installed in series, the transmission operation section has a plurality of work selection switches 8 provided depending on the type of work.
... and a display device 17 for displaying the gear shift position selected by the work selection switch 8,
When one selection switch 8 is pressed, the display device 17 displays the shift position for obtaining an intermediate speed in the shift range corresponding to the work content. do.

The present invention achieves the following technical effects with the above configuration. In other words, when the worker presses one of the work selection switches depending on the work content before starting work, the system selects an intermediate speed in the travel speed range from the lowest speed to the highest speed corresponding to the work content. Since the shift position is displayed on the display device, the operator only has to operate multiple shift levers or operation buttons as appropriate according to the display. To provide a speed change display device that can be freed from troublesome operations such as switching speed change levers, can be operated by anyone, and is less prone to operational errors.

Next, an embodiment of the present invention will be described based on the drawings. Reference numeral 1 is a powered agricultural machine, and the front panel 7 of the cockpit of the powered agricultural machine 1 has a work selection switch 8 with work details written on the top surface. A selection device 6 comprising changeover switches 9, 10, . . . for obtaining the lowest speed L or the highest speed H from among the selected speeds is attached. The transmission includes a main transmission 11 with 4 forward speeds and 1 reverse speed, and an auxiliary transmission 1 with 2 high and low speeds.
2 and an ultra-low speed (creep) transmission 13 with two high and low stages, the transmissions 11, 12, 13
are each one operating lever 14, 15, 16
It can be switched as appropriate. Each gear lever 14,1
Pilot lamps 17 are attached near the ends of the shift guide grooves 19 of the transmissions 11, 12, 13 as display devices for displaying the shift positions of the gears 5 and 16.

A control circuit 3 is provided between the display device 17 and the selection device 6, and the control circuit 3 stores the work content and the corresponding shift position in advance.
By pressing one of the work selection switches 8, you can select the optimum shift position suitable for the work (in this embodiment,
A shift position for obtaining an intermediate speed is selected in the travel shift range from the lowest speed to the highest speed corresponding to the work content (the shift position is stored in the control circuit 3),
Through the control circuit 3, each transmission device 11, 12,
The pilot lamp 17 installed at 13 lights up,
The gear position will be displayed. In the above example, when digging a trench by connecting a trencher (not shown) to the rear of the power agricultural machine 1, the selection device 6
Press switch 8 labeled "Trencher". Then, the control circuit 3 instructs the display device 17 of the transmission device 11, 12, 13 to transmit a transmission position corresponding to a speed approximately in the middle of 0.15 Km/h to 0.3 Km/h, and the operator changes the position based on the display. shift lever 1
4, 15, and 16 may be switched as appropriate. After the speed change operation, if the operator feels that this speed is too slow, he or she presses the changeover switch 10 for the highest speed H side;
When the side switch 9 is pressed, the control circuit 3 performs arithmetic processing, and then the shift position is displayed on the display device.

In this embodiment, as a display device, a pilot lamp 17 is attached near the end of the shift guide groove 19 of each transmission device 11, 12, 13, and the shift position is displayed by lighting the pilot lamp 17. Alternatively, a monitor (not shown) for instructing the shift position may be attached to the front panel 7 of the cockpit, and the shift may be performed based on the instruction.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which FIG. 1 is a plan view of a tractor, and FIG. 2 is an explanatory diagram of its operation. Explanation of symbols, 1...Power agricultural machine (tractor), 2
…Speed lever, 3…Control circuit, 4…Display device, 5
...Transmission device, 6...Selection device.

Claims (1)

[Claims] 1. In a power agricultural machine having at least two sets of transmissions installed in series, the transmission operation section includes a plurality of work selection switches 8 provided according to the type of work.
and a display device 17 for displaying the gear shift position selected by the work selection switch 8.
When one selection switch 8 is pressed, the display device 17 displays a shift position for obtaining an intermediate speed in a shift range corresponding to the work content.