JP2007186078A - Working vehicle provided with vessel and cab - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform tilt operation of a cab by operation of a tilt switch based on status signals of a parking brake, a transmission and a vessel and to perform the tilt operation of the cab by operation of the same tilt switch regardless of these signals. <P>SOLUTION: The working vehicle is provided with a control means 40 enabling the tilt operation of the cab by the tilt switch 30 only when the parking brake is turned ON, the transmission is neutral and a damp stopper of the vessel is turned ON; and a force switch 42 capable of outputting a force signal enabling the tilt operation of the cab relative to the tilt switch regardless of the output signal of the control means. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to a work vehicle having a dumpable vessel and a tiltable cab, and more particularly to a cab tilting means.

An articulated dump truck is one of typical examples of a work vehicle having a dumpable vessel and a tiltable cab (see, for example, Patent Document 1). In this dump truck, a front vehicle body and a rear vehicle body are connected to each other in a freely refraction manner around a vertical axis.

The vessel is equipped on the rear vehicle body so that it can be dumped backward, and the cab is equipped on the front vehicle body so that it can be tilted toward the vessel. The front vehicle body is provided with an engine room in front of the cab, and equipment such as a transmission is provided below the cab. The cab is tiltably mounted so that services such as maintenance, inspection, and repair of the equipment under the cab can be easily performed. The cab is tilted by, for example, a hydraulic cylinder that expands and contracts by a switch operation.

When the cab is tilted, various considerations are necessary prior to tilting. That is, the parking brake is actuated so that the vehicle does not move, the transmission that is the traveling transmission is neutralized, and the vessel is dumped in advance so that the tilted cab does not interfere with the vessel and held at that position by the stopper. There is a need.

For this purpose, a control device for carbitol has been developed. The control device can tilt the cab by operating the switch for the cab tilt only when the signal indicating the operation state of the parking brake, transmission, vessel, etc. is in a state where the cab may be tilted in advance. It has become.
JP 2000-302063 A (FIG. 2)

The control device for cabylt in the work vehicle having the form as described above has the following problems to be solved.

When tilting the cab, the control device is based on the signals of sensors that detect the state of parking brakes, transmissions, vessels, etc., only when those signals satisfy the conditions for tilting the predetermined cab. The cab can be tilted by operating the tilt switch. However, the switch that tilts the cab due to sensor abnormalities, disconnection, abnormalities in the control device itself, etc., even though parking brakes, transmissions, vessels, etc. satisfy the conditions for tilting the cab. Even if is operated, tilt may not work. In such a case, in order to service the equipment under the cab, it is necessary to disassemble and remove the cab from the vehicle body, and it is necessary to leave the cab for a long time, making it impossible to provide a quick and efficient service.

The present invention has been made in view of the above-described facts, and its technical problem is based on signals indicating states of a parking brake, a transmission, a vessel and the like when the cab is tilted in a work vehicle having a vessel and a cab. Thus, the tilt operation of the cab can be performed by the operation of the tilt switch, and the tilt operation of the cab can be performed by the operation of the same tilt switch regardless of these signals.

According to the present invention, as a work vehicle equipped with a vessel and a cab that solves the above technical problem, a vessel equipped with a dumping operation to the rear and a vehicle front portion that is the front side of the vessel to the rear. A cab equipped with a tilt operation, a tilt switch that controls the tilt operation, and a cab tilt operation using the tilt switch, the vehicle parking brake is on, the transmission is neutral, and the vessel is dumped. The control means that can be enabled by the output signal only when the dump stopper that is held at the specified position is in the ON state, and the compulsory signal that enables the tilt switch of the cab regardless of the output signal of this control means. A vessel and a cab, characterized in that it has a forced switch that can output Work vehicle is provided.

Preferably, the forcible switch and the tilt switch are of a manually operated automatic return contact type that returns when the contact is released. The work vehicle is a refractive steered articulated dump truck in which a front vehicle body equipped with a cab and a rear vehicle body equipped with a vessel are connected by an axis extending vertically.

A work vehicle having a vessel and a cab constructed in accordance with the present invention has a cab tilt operation by a tilt switch, a dump stopper that holds the vessel in a dump position while the vehicle parking brake is on, the transmission is in a neutral state, and And a control means for outputting a signal that enables the cab only when it is in an ON state, and a forcing signal that enables the tilt operation of the cab is output to the tilt switch regardless of the output signal of the control means. It has a forced switch that can.

Therefore, when the cab is tilted, the cab can be tilted by operating the tilt switch based on the signals indicating the parking brake, transmission, vessel, etc., and the forced switch regardless of the signal. The cab can be tilted by operating the tilt switch.

Hereinafter, a working vehicle including a vessel and a cab configured according to the present invention will be described in more detail with reference to the accompanying drawings illustrating a preferred embodiment of an articulated dump truck as a representative example.

The articulated dump truck will be described with reference to FIG. 3, which is a side view showing a state where the vessel is dumped and the cab is tilted. The articulated dump truck generally indicated by numeral 2 includes a front vehicle body 8 having a cab 4 and a front wheel 6, a vessel 10 as a loading platform, and a rear vehicle body 14 having biaxial rear wheels 12 and 12. . The front vehicle body 8 and the rear vehicle body 14 are connected around an axis 16 extending vertically, and the front vehicle body 8 and the rear vehicle body 14 are relatively refracted and steered by a hydraulic cylinder 18 interposed therebetween.

An engine room 20 is provided in front of the cab 4 of the front vehicle body 8. Equipment such as a transmission (not shown) is provided below the cab 4.

The cab 4 is attached to be able to tilt (tilt) toward the vessel 10 around an axis 5 located at the rear end of the front vehicle body 8. A tilting hydraulic cylinder 22 is attached between the cab 4 and the front vehicle body 8. The vessel 10 is attached so that it can be dumped rearward around an axis 11 located at the rear end of the rear vehicle body 14. A dump hydraulic cylinder 24 is attached between the vessel 10 and the rear vehicle body 14.

A panel (tilt switch, which will be described later) in which the tilt switch for operating the tilt operation of the cab 4 is attached to the front body 20 on the left side of the cab 4 (the front side in the direction perpendicular to the paper surface of FIG. 3), etc. Is provided.

The structure of the carbylating means will be described with reference to FIG. The cabylt means includes an electromagnetic direction switching valve 28 for supplying and discharging hydraulic oil to and from the tilt operating hydraulic cylinder 22, a tilt switch 30 for operating the direction switching valve 28, a parking brake operation detector 32, a transmission neutral position. When the detection signals of the detector 34 and the dump stopper detector 36 satisfy a predetermined condition, the control means 40 for connecting the power source 38 as an output signal, and the tilt of the cab 4 to the tilt switch 30 separately from the control means 40 A forcing switch 42 to which a power source 38 can be connected as a forcing signal for enabling operation is provided.

The electromagnetic direction switching valve 28 is a closed center type three-position valve. When the solenoid 28a on one side is energized, the pressure oil of the hydraulic source 44 is supplied to the bottom side of the tilting hydraulic cylinder 22 and the rod of the cylinder is extended. Thus, the cab 4 is pushed upward about the axis 5 (FIG. 3) and tilted backward. When the solenoid 28b on the other side is energized, the pressure oil from the hydraulic source 44 is supplied to the rod side of the tilting hydraulic cylinder 22, the cylinder rod is contracted, and the cab 5 is lowered.

The tilt switch 30 includes a pair of push button type switches, a “up switch” 30a connected to one solenoid 28a and a “down switch” 30b connected to the other solenoid 28b. The switches 30a and 30b are an automatic return contact type in which the contact is released and returned when the pressing is stopped.

Since the parking brake operation detector 32, the transmission neutral detector 34, and the dump stopper detector 36 themselves do not constitute a novel feature of the present invention, a detailed description and illustration are omitted, but the parking brake operation detector 32 is omitted. Detects the air pressure of an air release type parking brake that mechanically brakes the propulsion shaft, for example, by releasing the air pressure, and determines that the state where the air pressure is released and the parking brake is activated is “parking brake on”.

The transmission neutral detector 34 detects an electrical shift signal in the electronically controlled full automatic transmission, and determines that the transmission is neutral when the neutral signal is detected.

In the dump stopper detector 36, the dump stopper 25 (FIG. 3) having one end swingably attached to the rear vehicle body 14 is swung, and the other end is held in the vessel 10 in the dump state (state in FIG. 3). It is determined that “the dump stopper is on” by a limit switch (not shown) that contacts the swinging dump stopper 25.

The control means 40 is used only when the input signals from the parking brake operation detector 32, the transmission neutral detector 34 and the dump stopper detector 36 are the above-described parking brake on, transmission neutral on and dump stopper on. The power supply 38 is connected to the tilt switch 30 as an output signal. The control means 40 is incorporated in a controller (not shown) that controls the entire vehicle.

The forcible switch 42 installed so that the power source 38 can be connected to the tilt switch 30 without using the control means 40 is constituted by a push button switch of an automatic return contact type. Contact stops when you stop pressing.

With reference to FIG. 2, the panel to which the tilt switch 30 and the forced switch 42 are attached will be described. Various switches such as a power key, a switch, a horn button, and a display lamp are attached to the rectangular flat panel 46. On one side (left side in FIG. 2), a forcible switch 42, a cabbutylt operating lamp 48, a tilt “up switch” 30a, and a “down switch” 30b are attached in the vertical direction. A swinging open / close lid 43 is attached to the forced switch 42. The forced switch 42 cannot be operated unless the lid 43 is opened.

The operation of these switches installed on the panel 46 is performed by opening the door of the console 26 from the ground in the dump truck 2 (FIG. 3) or ascending to the fender of the front vehicle body 8.

Therefore, if the parking brake, transmission, and dump stopper described above are in a predetermined on state, the power source 38 is connected to the tilt switch 3 by the control means 40, and the tilt is only performed while the "raise switch" 30a is pressed. The operating hydraulic cylinder 22 is extended and the cab 4 is pushed up and tilted backward, and the tilting hydraulic cylinder 22 is contracted and tilted in the lowering direction only while the cab 4 is pushed by pushing the “lowering switch” 30b.

When any of the parking brake, the transmission, and the dump stopper is not in a predetermined ON state in the operation of the tilt switch 30, or any of the parking brake operation detector 32, the transmission neutral detector 34, and the dump stopper detector 36 If there is an abnormality, disconnection, or abnormality in the control means 40 itself, the power means 38 is not connected to the tilt switch 30 by the control means 40, so that even if the “up switch” 30a or “down switch” 30b is operated. The cab 4 is not tilted.

Therefore, although the parking brake, transmission, and dump stopper are all operated to be in a predetermined ON state, and the tilt switch 30 is operated even though the dump stopper 24 is visually confirmed to be effective. However, when the cab 4 does not tilt, the forcible switch 42 is pushed with the lid 43 swinging open, the power supply 38 is connected to the tilt switch 30, and the “up switch” 30 a or “ The cab 4 is tilted by the “lowering switch” 30b.

The operation of the cab tilting means in the work vehicle including the vessel and the cab as described above will be described.

The work vehicle 2 including the vessel 10 and the cab 4 is configured so that the tilt operation of the cab 4 by the tilt switch 30 is performed by a dump stopper that holds the vessel 10 in the dump position while the vehicle parking brake is on, the transmission is neutral. The control means 40 that outputs a signal that enables only when the switch 25 is in the ON state is provided, and the compulsory signal that enables the tilt switch 30 to perform the tilt operation of the cab 4 regardless of the output signal of the control means 40. Is provided. The forcible switch 42 is provided.

Therefore, when the cab 4 is tilted, the cab 4 can be tilted by operating the tilt switch 30 based on the output signals of the state signals of the parking brake, transmission, vessel, and the like. Regardless, the cab 4 can be tilted by operating the forced switch 42 and the tilt switch 30.

The forcible switch 42 and the tilt switch 30 are configured as a manual operation automatic return contact type that returns when the contact is released. When the cab 4 is tilted by operating the forcible switch 42 and the tilt switch 30, Since both switches must be kept pressed, the operation is not as good as when the tilt switch 30 is simply pressed when the signal is normally output from the control means 40. Therefore, erroneous operation of the forced switch 42 can be prevented together with the lid 43 provided on the forced switch 42.

The work vehicle 2 is a refractive steered articulated dump truck in which a front vehicle body 8 equipped with a cab 4 and a rear vehicle body 14 equipped with a vessel 10 are connected by an axis 16 extending in the vertical direction.

In other words, the well-known articulated dump truck can be effectively used in tunnels and narrow work sites due to its small turning ability, which is a refraction steering type characteristic. The cab 4 of the front vehicle body 8 and the vessel 10 of the rear vehicle body 14 are installed as close as possible. Therefore, the present invention provides an articulated dump truck which is a refractive steering type work vehicle in which a front vehicle body 8 equipped with a cab 4 and a rear vehicle body 14 equipped with a vessel 10 are connected by an axis 16 extending vertically. Is particularly effective.

The structure explanatory drawing of the carbuto means comprised according to this invention. The figure of the operation panel of cabbutylt operation. The side view which showed the articulated type dump truck as a work vehicle provided with the vessel and the cab provided with the cabbutylt means comprised according to this invention in the vessel dump state and the carbitol state.

Explanation of symbols

2: Articulated dump truck (work vehicle)
4: Cab 8: Front car body 10: Vessel 14: Rear car body 16: Vertically extending axis 30: Tilt switch 30a: Raising switch 30b: Lowering switch 40: Control means 42: Forced switch

Claims (3)

A vessel equipped with a dumping operation to the rear,
A cab equipped with a rearward tilting operation at the front of the vehicle on the front side of the vessel;
A tilt switch for controlling the tilt operation;
The tilt operation of the cab by the tilt switch is enabled by the output signal only when the vehicle parking brake is on, the transmission is in the neutral state, and the dump stopper that holds the vessel at the dumped position is on. Control means;
Regardless of the output signal of this control means, the tilt switch has a forcible switch that can output a forcible signal that enables the tilt operation of the cab.
A work vehicle having a vessel and a cab characterized by the above. Forced switch and tilt switch are manual operation automatic return contact type that returns when the contact is released.
The work vehicle according to claim 1. Work vehicle
A refraction-steered articulated dump truck in which a front vehicle body equipped with a cab and a rear vehicle body equipped with a vessel are connected by a vertically extending axis.
The work vehicle according to claim 1 or 2, wherein

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