JPH0529952Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention mainly relates to a steering warning system for a retractable work vehicle such as a wheel loader.

BACKGROUND ART FIG. 3 is a plan view of a wheel loader 1 of the folding body type work vehicle. In the figure, 2 is the front body of the wheel loader 1, 3 is the rear body, 4 is the joint between the front body 2 and the rear body 3, 5 is the driver's cab,
6 is a steering wheel in the driver's cab 5.

In the wheel loader 1, the front vehicle body 2 is connected to the rear vehicle body 3 so that the front vehicle body 2 can be bent relative to the rear vehicle body 3, with the coupling portion 4 as the bending center. Therefore, by operating the steering handle 6, the front body 2 can be bent by an angle α to the left and right with respect to the rear body 3 during driving.

Problems to be Solved by the Invention When the driver rotates the steering wheel during operation of the wheel loader, the wheel loader performs a bending operation with the joint of the vehicle body as the center of bending. Some workers working near the wheel loader did not notice the bending action, and there was a risk of being caught in the vehicle body.

This invention solves the above problems and is a steering alarm system that issues an alarm to nearby workers even if the wheel loader operates the steering wheel without operating the turn signal when working in a narrow site. The purpose is to provide

Means for Solving the Problems The means of this invention taken to solve the above problems are: (a) Attaching a detected member to the steering shaft of a work vehicle, and detecting the amount and direction of rotational angular displacement of the detected member. (b) A signal detected by the detector when the detected member rotates during steering operation is input to the detection unit device; (c) Based on the input signal, the detection unit device sends a signal to the alarm device. It was configured to output an alarm signal.

Operation A When a steering operation is performed, the detected member attached to the steering shaft rotates.
The detector that detects the rotational angular displacement amount and direction of the detected member outputs the detection signal.

(b) The detection signal from the detector is input to the detection unit device.

c) The detection unit outputs an alarm generation signal to the alarm device based on the above input signal. Therefore, the warning device issues a warning indicating a left turn or a right turn, for example by voice.

Embodiments Hereinafter, embodiments of this invention will be described in detail based on the drawings. FIG. 1 is a circuit diagram showing a steering warning device according to this invention. In the figure, 7 is a steering shaft formed integrally with the steering handle 6, 8 is a disk-shaped detected member attached to the steering shaft 7, and A is a slit arranged on the circumference of the detected member 8. 9 and 10 are electromagnetic pickup type detectors mounted with relative phase angles shifted from each other, 11 is a detection unit device, and 12 is an alarm device. Figure 2 shows detection signals A and B output from detectors 9 and 10 during steering operation.
It is a characteristic graph showing.

Next, the configuration of the steering warning device according to this invention will be described with reference to FIGS. 1 and 2. Attach the detected member 8 to the steering shaft 7,
Further, detectors 9 and 10 for detecting the rotational angular displacement amount and direction of the detected member 8 are provided on the vehicle body 3. When the detected member 8 rotates during steering operation, the signals A and B detected by the detectors 9 and 10 are input to the detection unit device 11, and based on the input signals, the detection unit device 11 sends the alarm device 12. The system is configured to output an alarm signal in response to the alarm.

Next, the functions of the steering warning device according to this invention will be described. When the steering operation is performed, the detected member 8 attached to the steering shaft 7 rotates. Detectors 9 and 10 detect the rotational angular displacement amount and direction of the detected member 8
outputs its detection signals A and B. The detection signals A and B are then input to the detection unit device 11. Based on the input signal, an alarm generation signal is outputted from the detection unit device 11 to the alarm device 12. Therefore, the warning device 12 issues a warning indicating a left turn or right turn, for example, by voice. As a result, workers near the vehicle can immediately recognize the warning and evacuate away from the vehicle.

Effects of the invention When the driver rotates the steering wheel while working on the wheel loader, the wheel loader performs a refraction operation with the connection part of the car body as the center of refraction. The driver was unaware of the refraction action and was at risk of being caught in the vehicle body.

However, in the steering alarm system according to this invention, a member to be detected is attached to the steering shaft of a work vehicle, and a detector for detecting the amount and direction of rotational angular displacement of the member to be detected is provided on the vehicle body, and when the steering wheel of the work vehicle is operated. , the alarm device issues a warning such as audio via the detection unit device. Thereby, even if the work vehicle is operated in a narrow work site and the steering wheel is operated without operating the direction indicator, it is possible to make nearby workers aware of the warning.

Therefore, in a work vehicle with a retractable vehicle body equipped with the steering alarm device according to the present invention, safety is improved when the vehicle body is driven in a retracted state by performing a steering operation.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing a steering warning device according to the invention, FIG. 2 is a characteristic graph showing signals output from a detector, and FIG. 3 is a plan view of a wheel loader. 2... Front vehicle body, 3... Rear vehicle body, 4... Joint portion, 6... Steering handle, 7... Steering shaft, 8... Member to be detected, 9, 10...
...Detector, 11...Detection unit device, 12...
Alarm device.

Claims (1)

[Scope of utility model registration request] In a refraction work vehicle in which the front body is connected to the rear body so that the front body can be bent relative to the rear body, a member to be detected is attached to the steering shaft, and a detector for detecting the amount of rotational angular displacement and direction of the member to be detected is mounted on the vehicle body. and is configured to input a signal detected by the detector when the detected member rotates during steering operation to the detection unit device, and output an alarm generation signal to the alarm device from the detection unit device based on the input signal. A steering warning device for a work vehicle, which is characterized by: