JPS6218535Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a warning device for allowing safe use of agricultural tractors.

Agricultural tractors are usually steered by changing the direction of the front wheels, but the left and right brake pedals, which separately brake the left and right rear wheels connected by a differential transmission mechanism, are placed side by side so that they can be depressed simultaneously. By selectively braking the left and right rear wheels using the left and right brake pedals, it is possible to perform sharp turns even when driving at low speed in a field. Further, by providing a mechanism for switching between a state in which the left and right brake pedals can be operated separately and a state in which they can only be operated simultaneously, the left and right brake pedals can only be operated at the same time when driving at high speeds on the road. This is designed to prevent the risk of braking only one of the left and right rear wheels due to an operational error, resulting in a sudden turn at high speed.

However, there are cases where the driver forgets to switch the switching mechanism to an appropriate state depending on the driving speed change state, which may lead to the above-mentioned danger. For this reason, a method has been proposed in the past to provide a mechanism that alerts the operator to the two states of the switching mechanism so that the operator can accurately recognize the switching state of the switching mechanism. There was a fear that I wouldn't be able to do it.

That is, in the above case, although the switching state of the switching mechanism can be accurately recognized, there is a risk that a sudden turn will be made while traveling at high speed due to an erroneous operation of the traveling transmission mechanism. Incidentally, the traveling speed of the aircraft can be intuitively recognized by an experienced person, but an unskilled person cannot accurately recognize it, and the above-mentioned danger occurs.

The present invention was developed with the above-mentioned circumstances in mind, and it brakes the left and right rear wheels separately, which are connected by a differential transmission mechanism, and uses left and right brake pedals, which are juxtaposed so that they can be depressed simultaneously, on each brake pedal. Based on the detection results of the switching state detection device of the mechanism that switches between a state where separate operations can be performed and a state where only simultaneous operations can be performed, and the detection results of the transmission state detection device of the traveling transmission mechanism, the right and left brake pedals are One alarm can be used to detect three states: a state in which the left and right brake pedals can be operated separately, a state in which the left and right brake pedals can be operated separately at low speeds, and a state in which the left and right brake pedals can only be operated simultaneously regardless of the speed change. The gear change state switching device 18 and the alarm device 20 are connected to the flashing circuit 19 of the turn signal lamp 21 so that the device 20 provides notification in different alarm states of intermittent alarm, no alarm, and continuous alarm. characterized by something.

In other words, while accurately warning whether the left and right brake pedals can only be operated at the same time or individually, and in a state where the left and right brake pedals can be operated independently, the traveling transmission mechanism It is possible to accurately warn whether the vehicle is at high speed or low speed, and it has become possible to reliably eliminate the danger of making a sharp turn while driving at high speed. In particular, according to the present proposal, in a state where the left and right brake pedals can only be operated simultaneously, there is no particular difference in terms of safety whether the traveling transmission mechanism is at high or low speed, and even if this is considered as one state, there is no particular problem. Focusing on the fact that there is no such thing, the system only issues warnings for three states, so even when the left and right brake pedals can only be operated simultaneously, the system issues separate warnings for high speed and low speed, giving a total of four warning states. This method not only avoids complicating the alarm mechanism and is advantageous in terms of production, but also enables the operator to issue an alarm in a form that is easy to understand. Moreover, since the alarm mechanism is connected to the turn signal lamp blinking circuit, the alarm device can issue intermittent alarms, no alarms, and continuous alarms. Therefore, it is possible to further simplify the warning mechanism with intermittent warnings that are most likely to draw the driver's attention. Furthermore, there are two conditions: one is the most dangerous condition in which sharp turns are made at high speed, and the other is not.
In addition to alerting you of the current situation, it is also possible to alert you to situations where the left and right brake pedals can only be operated simultaneously, regardless of high or low speeds, so you can properly check before starting the aircraft to ensure safe driving. There are some very advantageous advantages. In the end, we have achieved a warning system for agricultural tractors that has great practical advantages as a whole.

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

FIG. 1 shows a plan view of an agricultural tractor, including left and right front wheels 1, 1 whose direction can be changed, left and right rear wheels 3, 3 connected by a differential transmission mechanism 2, and these rear wheels 3, 3.
Mechanisms 4, 4 for braking separately, left and right brake pedals 5, 5, which are linked to each of these braking mechanisms 4, 4 separately and arranged side by side so that they can be depressed simultaneously, and a transmission case in which the output of the engine 6 is transmitted to the driving transmission case. A clutch pedal 9 operates a transmission clutch 8 on and off to intermittent transmission to the engine 7, an accelerator lever 10 changes and sets the rotational speed of the engine 6, a steering handle 11, and three forward speeds and one reverse speed. The gear shift mechanism in the transmission case 7 is operated using the main shift lever 12 that changes the speed, and the auxiliary shift lever 13 that shifts the output shifted by the main shift lever 12 into two high and low gears. It is equipped with a traveling speed change mechanism that switches the traveling speed between 6 forward speeds and 2 reverse speeds.

A linking metal fitting 14 pivotably supported on one of the left and right brake pedals 5, 5 is switched and swung between a state in which it engages with an engaging piece 15 provided on the other pedal and a state in which it does not engage. This constitutes a mechanism for switching the left and right brake pedals 5, 5 between a state in which they can be operated separately and a state in which they can only be operated simultaneously.

Next, a device that issues an alarm based on the speed change state of the traveling transmission mechanism and the switching state of the switching mechanism will be described.

That is, the linking metal fitting 14 in the switching mechanism
A first reed switch 16 is constructed using a magnetic material and is operated to be turned on or off by approaching and separating the interlocking fitting 14 from the brake pedal 5 to which the engagement piece 15 is attached.
is provided as a switching state detection device for the switching mechanism.

A magnet 17 is attached to the sub-shift lever 13,
When the gear shift lever 13 is shifted at a high speed backward, the magnet 17 approaches and the shift lever 13 is engaged.
A second reed switch 18, which is turned off by the separation of the magnet 17 during a low forward speed change, is provided as a speed change state detection device.

As shown in the electrical circuit diagram in Figure 4, the lights turn off, turn on,
The first and second reed switches 16 and 18 are connected to one warning lamp 20 which can be switched to three blinking states using a blinking circuit 19, and the left and right brake pedals 5, 18 are connected to each other in a high speed range. 5 can perform separate operations, the lamp 20 flashes to warn you of this, and in the low speed range the left and right brake pedals 5, 5
When the left and right brake pedals 5, 5 can be operated separately, the lamp 20 is turned off to warn you of this, and when the left and right brake pedals 5, 5 can only be operated simultaneously, regardless of the speed change, the lamp 20 is turned on to warn of this. It is configured to issue an alarm. and the blinking circuit 19
are left and right turn signal lamps 21, 2 for direction indication.
It is also used for the flashing of 1, and 22
is a lighting switch for the blinker lamps 21, 21.

In addition, in implementing the present invention, in the case where the traveling speed is changed in multiple stages, for example, when the forward speed is changed into six stages as in the embodiment, only the fifth and sixth forward speeds are set as the high speed range. Furthermore, the classification between high speed range and low speed range should be selected as appropriate depending on the specifications of the aircraft.

Furthermore, various configurations of the alarm mechanism are conceivable, such as a combination of an alarm lamp and an alarm sound to alert three states.

[Brief explanation of the drawing]

The drawings show an embodiment of the alarm device for an agricultural tractor according to the present invention, and FIG. 1 is a plan view of the agricultural tractor;
FIG. 2 is a perspective view of the brake pedal mounting portion, FIG. 3 is a perspective view of the sub-shift lever mounting portion, and FIG. 4 is an electrical circuit diagram. 2... Differential transmission mechanism, 3, 3... Rear wheel, 5, 5
...Brake pedal, 16...Switching state detection device, 1
8... Speed change state detection device, 19... Flashing circuit, 2
0... Alarm device, 21... Turn signal lamp.

Claims (1)

[Scope of utility model registration request] Left and right rear wheels 3, 3 connected by differential transmission mechanism 2
Detection results of a switching state detection device 16 of a mechanism that brakes each brake pedal separately and switches the left and right brake pedals 5, 5, which are juxtaposed so that they can be depressed simultaneously, between a state where each can be operated separately and a state where only simultaneous operations can be performed; Based on the detection result of the shift state detection device 18 of the transmission mechanism, the left and right brake pedals 5, 5 can be operated separately in a high speed range, and the left and right brake pedals 5, 5 can be operated separately in a low speed range. and a state in which the left and right brake pedals 5, 5 can only be operated simultaneously regardless of the traveling speed change, and a state in which the left and right brake pedals 5, 5 can only be operated simultaneously, and different alarm states of one alarm device 20, such as intermittent alarm, no alarm, and continuous alarm. The shift state switching device 18 and the alarm device 20 are connected to the blinker lamp 2 so as to give an alarm.
1. A warning device for an agricultural tractor, characterized in that the warning device is connected to a blinking circuit 19 of No. 1.