JPH02168100A - Frame damage preventing device for dump truck - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a device for preventing the frame of a dump truck from being damaged due to torsion exerted when driving on a rough road.

[Conventional technology]

A dump truck has front and rear wheels attached to the front and rear, left and right sides of a frame via suspension cylinders, and has a driver's cab and body on the frame.The rear wheels are driven by engine output, and the front wheels are connected to a steering wheel. It is designed to run by steering the car.

[Problem to be solved by the invention]

When such a dump truck is driven on a rough road, the frame may be torsioned and damaged.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a frame damage prevention device for a dump truck, which allows an operator to sense when a torsion exceeding a predetermined value is applied to the frame and prevent the frame from being damaged.

[Means and actions for solving the problem] Front left and right and rear left and right pressure sensors detect the oil pressure in the front left and right and rear left and right suspension cylinders, and the detected oil pressure of these pressure sensors acts on the front and rear of the frame. This device is equipped with a controller that calculates the front torsion and rear torsion and activates a warning device when the torsion exceeds a set value.This allows the operator to sense that the frame is being torsioned in an amount greater than the set value. This prevents damage to the frame due to operations such as slowing down the vehicle.

〔Example〕

As shown in Fig. 2, front wheels 2 and rear wheels 3 are located on the left and right sides of the vehicle body 1.
are attached via the front left and right suspension cylinders 4.5 and the rear left and right suspension cylinders 6.7, as well as front left and right pressure sensors 8 and 9 and rear left and right pressure sensors 10 degrees that detect the oil pressure in each suspension cylinder. 11, and a driver's cab and a body (not shown) are provided on the vehicle body 1 to constitute a dump truck.

As shown in FIG. 1, the detected oil pressure of each pressure sensor is input to the controller 12, which calculates the torsion acting on the front and rear parts of the frame 1. If the torsion exceeds a set value, a warning device, e.g. This is to activate the lamp 13 and buzzer 14.

The front torsion M and the rear torsion MR are calculated using the following equations.

Mp = l PPL PPIII X LPMR-
l PRL PRRI XLRHowever, PPL is the pressure of the front left pressure sensor 8, PPR is the pressure of the front pressure sensor 9, PRL is the pressure of the rear left pressure sensor 10, PRR is the pressure of the rear pressure sensor 11, and LP is The distance between the front left and right suspension cylinders 4 and 5, LR is the distance between the rear left and right suspension cylinders 6 and 7.

In other words, the oil pressure inside the suspension cylinder is proportional to the external force acting on the wheels, so by detecting that oil pressure with a pressure sensor, you can know the force acting on frame 1, and the difference between the oil pressure detected by the left and right pressure sensors and the distance The torsion acting on frame 1 can be detected by the product of .

When the larger of the front torsion MP and the rear torsion M is larger than a preset value, the lamp 13 and the buzzer 1 are activated.
4 allows the operator to know that a large torsion is acting on the frame, and can take actions such as slowing down the running speed to prevent large torsion from acting on the frame, thereby preventing frame damage. can.

〔Effect of the invention〕

The front torsion and rear torsion acting on the front and rear parts of the frame can be calculated and detected, and if the large value exceeds a set value, a warning device will be activated, allowing the operator to know when large torsion has been applied to the frame. This can be detected, and it is possible to take actions such as slowing down the vehicle to reduce torsion and prevent frame damage.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, with FIG. 1 being a circuit diagram and FIG. 2 being a schematic perspective view of a dump truck. 1 is the vehicle body, 2 is the front wheel, 3 is the rear wheel, 4 and 5 are the front left and right suspension cylinders, 6 and 7 are the rear left and right suspension cylinders, 8.9 is the front left and right pressure sensor, 10.11 is the rear left and right pressure sensor , 12 is a controller.

Claims (1)

[Claims] Left and right front wheels 2, 2 and rear wheels 3, 3 are attached to the vehicle body 1 via front left and right suspension cylinders 4, 5 and rear left and right suspension cylinders 6, 7, and a front left and right pressure sensor is used to detect the hydraulic pressure in each suspension cylinder. Sensors 8 and 9 and rear left and right pressure sensors 10 and 11 are provided, and the front torsion acting on the front part of the frame and the rear torsion acting on the rear part of the frame are calculated based on the oil pressure detected by each pressure sensor, and when the torsion is greater than a set value. Controller 1 activates a warning device when
2. A dump truck frame damage prevention device characterized by comprising: 2.