JP2002046665A - Crawler vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shake a mud guard cover for a fixed time during stopping for preventing mud from piling up on the mud guard cover. SOLUTION: Hydraulic cylinders 24 and 25 are mounted on a truck frame of hydraulic excavator and an electromagnetic valve 32 is mounted in the middle of a main pipe 29B connecting the hydraulic cylinders 24 and 25 with a hydraulic pump 26. A pressure switch 36 and a time limit timer 38 are mounted in the middle of wiring 34 for connecting the electromagnetic valve 32 with a power source 33. Thereby pressure oil inside a pilot pipe 37 is guided to the pressure switch 36 for closing the pressure switch 36 during stoppage. The electromagnetic valve 32 is then held at a valve opening position (b) for a fixed limit time by having current from the power source 33 supplied to the electromagnetic valve 32 via the time limit timer 38 to shake and mud guard cover 21 by the hydraulic cylinders 24 and 25 during that time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tracked vehicle suitably used for a construction machine having a crawler, such as a hydraulic shovel or a hydraulic crane.

[0002]

2. Description of the Related Art In general, a tracked vehicle used for construction equipment such as a hydraulic excavator includes a track frame provided with a pair of side frames on both left and right sides of a center frame, and a front and rear direction of the side frames. An idler wheel provided on one side, a drive wheel provided on the other side in front of and behind the side frame, a crawler belt provided between the idler wheel and the drive wheel, An upper roller and the like are provided on the upper surface side of the side frame and guide the crawler belt.

[0003] In this kind of tracked vehicle according to the prior art, a driving wheel provided on a side frame of a truck frame is driven to rotate by a hydraulic motor for traveling or the like, and a crawler belt circulates between an idler wheel and a driving wheel. This causes the vehicle to move forward or backward.

By the way, in a tracked vehicle according to the prior art, when traveling on muddy ground, for example, mud and the like scraped up by the crawler belt often accumulate between the side frame and the crawler belt. The smooth rotation of the upper roller is hindered by the mud, so that the movement of the crawler belt is deteriorated, and the running property is easily reduced.

On the other hand, as another prior art, a soil discharging member is provided on each of the idler wheel side and the driving wheel side of the side frame, and the mud adhering to the inside of the crawler belt is scraped by the discharging member when the crawler belt is driven. It is known that the liquid is discharged so as to be dropped (for example, Japanese Patent Application Laid-Open No. 8-31045).
No. 7).

In this prior art, earth discharging members provided on the idle wheel side and the drive wheel side of the side frame, respectively,
It operates so as to scrape off the mud in contact with the mud attached to the inside of the crawler belt, thereby preventing the mud from accumulating between the side frame and the crawler belt.

[0007]

By the way, in the other prior arts described above, since the side frame is merely provided with a soil discharging member, the mud adhering to the crawler belt when traveling on, for example, a muddy ground is sufficiently removed. It is difficult to remove the soil, and mud often accumulates between the crawler belt and the upper surface of the side frame.

In particular, when the vehicle travels on a soft ground made of mud having a high viscosity such as the Kanto loam layer, the mud may be tightly packed in the gap between the track frame and the crawler belt. In this case, there is a problem that the appearance quality of a tracked vehicle such as a hydraulic shovel or the like is remarkably deteriorated by the mud and the commercial value is reduced for a leasing company or a rental company.

Further, since mud accumulated between the side frame and the crawler belt hinders smooth rotation of the upper roller, it is necessary to remove the mud using, for example, washing water or a scoop. Has the problem of spending a lot of time and effort.

Further, in a cold region or the like, if the mud accumulated between the side frame and the crawler belt becomes frozen soil, it is extremely difficult to remove the mud. In particular,
The muddy water and the like jumped up by the crawler belt adhere to the space between the crawler belt and the upper roller and freeze, thereby hindering the smooth operation of the crawler belt and the upper roller and performing a stable traveling operation. There is a problem that it becomes difficult.

On the other hand, in order to solve such a problem,
The present applicant has provided a mudguard cover that covers the side frame from the upper side between the upper surface of the side frame and the crawler belt, and vibrates the mudguard cover using a vibrator made of a hydraulic cylinder or the like so that the crawler belt or the like can be used during traveling. We are studying a method to discharge the mud that has fallen into the mudguard cover from the outside and prevent the mud from accumulating on the side frames.

However, even if such a method is used, the mud adhering to the crawler belt or the like during traveling falls and adheres to the mudguard cover with a time delay after the traveling is stopped. For this reason, mud tends to accumulate on the mudguard cover, and there is a problem that the mud removing operation performed during the maintenance work of the hydraulic shovel is burdensome for the operator.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art. It is an object of the present invention to prevent a mud cover from preventing the accumulation of mud between a track frame and a cover band and to provide a mud cover. It is an object of the present invention to provide a tracked vehicle that can solve the problem of accumulation of mud and the like and can simplify the operation of removing mud.

[0014]

In order to solve the above-mentioned problems, a tracked vehicle according to the present invention comprises: a track frame provided with side frames on both left and right sides of a center frame; An idler wheel provided on one side in the rear direction, a drive wheel provided on the other side in front of and behind the respective side frames and driven by a hydraulic motor for traveling, and A crawler belt wound between the crawler belt and a mudguard cover provided on the track frame and located between the upper surface of the side frame and the crawler belt and covering the track frame from above.

The first aspect of the present invention is characterized in that the mudguard cover is provided between the track frame and the mudguard cover to vibrate the mudguard cover by supplying and discharging pressure oil from a hydraulic source. A vibration actuator, and a valve which is provided in the middle of a pipe connecting the vibration actuator to a hydraulic pressure source and which is always in a valve-closing position for cutting off the vibration actuator and the hydraulic power source, and which is externally provided with a control signal When the hydraulic motor is stopped, the switching valve is switched to a valve-opening position that connects the vibration actuator to a hydraulic power source, and when the hydraulic motor is stopped, the control signal is output to the switching valve. Switch means for stopping the output of the control signal to the switching valve.

With this configuration, when the hydraulic motor is operated to drive the tracked vehicle, the output of the control signal to the switching valve is stopped by the switch means, and the switching valve is closed. Switched to position. At this time, the supply and discharge of the pressure oil from the hydraulic source to the vibration actuator is stopped, and the vibration of the mudguard cover by the vibration actuator is kept stopped.

When the traveling is stopped by the hydraulic motor, the control signal is output to the switching valve by the switch means, so that the switching valve is switched to the valve opening position. Then, at this time, the pressure oil from the hydraulic pressure source is supplied to and discharged from the vibration actuator, whereby the vibration actuator is operated and the mudguard cover can be vibrated.

According to a second aspect of the present invention, the switch means is provided in the middle of the wiring for connecting the switching valve to the power supply, and is normally closed, and a part of the pressure oil for operating the hydraulic motor is supplied. It consists of a pressure switch that is sometimes opened.

With this configuration, when the hydraulic motor is stopped, the pressure switch is closed to supply a current as a control signal from the power supply to the switching valve, and the switching valve can be opened. Further, when the hydraulic motor is operated, the pressure switch is opened by supplying the pressure oil to the pressure switch, the supply of the current to the switching valve is stopped, and the switching valve can be closed.

Further, the invention according to claim 3 is provided with timer means for stopping the output of the control signal when the control signal is output to the switching valve for a predetermined period of time. With this configuration, when traveling is stopped, the switching valve can be switched to the valve opening position by the timer means for a predetermined period of time. After a certain time has elapsed, the output of the control signal to the switching valve is stopped by the timer means, and the switching valve can be closed.

According to a fourth aspect of the present invention, the track frame is a track frame constituting a lower traveling body of the hydraulic shovel, and the switching valve, the switch means and the timer means are mounted on the track frame so as to be pivotable. It is configured to be mounted on the revolving structure side. With such a configuration, maintenance of the switching valve, the switch means, and the timer means can be easily performed from outside the upper rotating body.

Further, according to a fifth aspect of the present invention, the track frame is a track frame constituting a lower traveling body of the hydraulic shovel, and the switching valve, the switch means and the timer means are mounted on the track frame side.
With such a configuration, the switching valve, the switch means, and the timer means can be accommodated in, for example, the round body of the truck frame, and the mounting space for these can be easily secured in the round body.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an example in which a tracked vehicle according to an embodiment of the present invention is applied to a hydraulic shovel will be described.
This will be described in detail with reference to the accompanying drawings.

FIGS. 1 to 8 show a first embodiment of the present invention. In the drawings, reference numeral 1 denotes a lower traveling body, and 2 denotes an upper revolving body which is mounted on the lower traveling body 1 so as to be pivotable. The upper revolving unit 2 includes a building cover 3 containing a motor and the like, a cab 4 as a cab, and a counterweight 5.
And the like. A working device 6 for excavating soil and the like is provided at the front of the upper swing body 2 so as to be able to move up and down.

Reference numeral 7 denotes a track frame constituting a main body of the lower traveling body 1. The track frame 7 is formed by welding a steel plate or the like as shown in FIGS. And side frames 11, 11 provided on both the left and right sides of the center frame 8 and extending in the front and rear directions, which will be described later.

Here, the center frame 8 is shown in FIGS.
As shown in the figure, a circular cylinder 9 is formed at the center, and legs 10 extending in the front, rear, left, and right directions from the outer peripheral side of the circular cylinder 9 and forming an H shape as a whole. And the leg 10 is
Upper plate portion 10A, lower plate portion 10B and these plate portions 10
A and 10B are formed as a can-made structure by a side plate portion 10C which is connected in the upper and lower directions.

Reference numerals 11 and 11 denote legs 10 of the center frame 8.
The left and right side frames are provided by welding to the left and right sides, respectively. The side frame 11 is a substantially U-shaped frame body extending forward and rearward as shown in FIGS. It is formed as. And the side frame 11
Is an upper plate portion 11A in which the left and right widthwise middle portions are bent in a V shape, and extends downward from the widthwise inner end (the right end portion in FIG. 5) of the upper plate portion 11A. It is roughly constituted by an inner side plate portion 11B and an outer side plate portion 11C extending downward from the widthwise outer end of the upper plate portion 11A.

An end plate 12 is provided at one end in the front and rear directions of the side frame 11, and an idler wheel bracket 13 is integrally provided on the end plate 12. The end plate 12 is also provided at the other end of the side frame 11 in the front and rear directions.
The end plate 12 is provided with a drive wheel bracket 14 integrally therewith.

Numeral 15 denotes an idler wheel which is located on one side in the front and rear directions of the side frame 11 and is rotatably provided on the idler wheel bracket 13, and 16 is located on the other side of the front and rear sides of the side frame 11. The driving wheels 16 are rotatably driven by a hydraulic motor 17 or the like as shown in FIG. Here, the hydraulic motor 17 rotates by supplying and discharging pressure oil from a hydraulic pump 26 described later.

Reference numeral 18 denotes left and right crawler belts (only one of them is shown) wound around the idler wheel 15 and the drive wheel 16. The crawler belt 18 is provided between the idler wheel 15 and the drive wheel 16. The upper and lower sides of the side frame 11 extend forward and rearward. The crawler belt 18 travels and drives the lower traveling body 1 by drivingly driving the drive wheels 16 with the hydraulic motor 17.

Reference numerals 19, 19 denote upper rollers provided on the upper plate portion 11A of the side frame 11 so as to be separated from each other in front and rear. These upper rollers 19 guide the crawler belt 18 above the side frame 11, and Is to compensate for the smooth movement of. Are lower rollers provided on the lower side of the side frame 11;
Guides the crawler belt 18 under the side frame 11,
In addition to increasing the contact area of the crawler belt 18 with the ground, the crawler belt 18 operates smoothly along the ground.

Reference numerals 21 and 21 denote side frames 11 and crawler tracks 1.
8 and a mudguard cover provided on the upper plate portion 11A. The mudguard cover 21 is made of a plate body such as a steel plate as shown in FIGS. It extends from the side 8 to the side frame 11 side inclining downward left and right.

The mudguard cover 21 is provided on the left and right sides of the round body 9 with the legs 10 (upper plate 10) of the center frame 8.
A) is partially covered from the upper side, and the upper surface side of each side frame 11 is covered over substantially the entire length.

Here, the mudguard cover 21 is shown in FIGS.
As shown in FIG. 5, the guide 23 is displaceably mounted on an upper plate portion 11A of the side frame 11 by using guides 23 described later, and these guides 23 serve in the directions indicated by arrows A in FIGS. The vibrating operation is repeatedly performed in the left and right directions substantially orthogonal to the thickness direction.

The mudguard cover 21 has a left and right inner end 21A extending along the leg 10 (upper plate 10A) of the center frame 8 to a position close to the round body 9, and the left and right sides.
The middle part in the right width direction is bent in a substantially rectangular shape in accordance with the upper plate 11A of the side frame 11, as shown in FIG. Further, the outer end of the mudguard cover 21 is folded back into a substantially L-shape as a folded portion 21B at a corner on the side plate 11C between the upper plate 11A and the side plate 11C.

In the middle part in the width direction of the mudguard cover 21, substantially rectangular notches 21C, 21C are formed at positions corresponding to the upper rollers 19 as shown in FIGS.
These cutouts 21C prevent the mudguard cover 21 from interfering with the upper roller 19 even when the vibrating operation is performed by attaching the mudguard cover 21 to the side frame 11 or the like.

Thus, the left and right mudguard covers 21 and 2
1 is disposed obliquely downward from the center frame 8 side toward the outside in the width direction of the side frame 11, and is scraped up by the crawler belt 18 by covering the upper plate portion 10A of the leg portion 10 and the side frame 11 from above. The mud and the like are prevented from falling onto the upper plate portion 10A and the side frame 11 of the leg portion 10, and the mud and the like are discharged to the outside along the inclination direction of the mudguard cover 21 with a vibration operation described later. is there.

As shown in FIG. 6, a coating layer 22 is formed on the surface of the mudguard cover 21 as shown in FIG. 6. The coating layer 22 has a low friction coefficient, for example, a fluorine resin, a silicone resin or the like as a main component, that is, a repellent. When the mud adhering to the crawler belt 18 falls onto the mudguard cover 21, the mudguard adheres to the crawler belt 18 and smoothly discharges the mud to the outside along the inclination direction of the mudguard cover 21. It has.

Are guides provided between the upper plate 11A of the side frame 11 and the mudguard cover 21. The guides 23 are spaced apart in the length direction of the side frame 11 as shown in FIG. 5 and 6
And a guide rail 23A fixed to the upper plate portion 11A of the side frame 11 by welding or the like, and a guide rail 23 attached to the back surface (lower surface) of the mudguard cover 21 as shown in FIG.
A and a slider 23B slidably fitted to A.

Here, the guide rail 23A of the guide 23
6, a concave groove-shaped rail groove 23C is formed as shown in FIG. 6, and the slider 23B on the mudguard cover 21 side is mounted in the rail groove 23C in a retaining state. Each of these guides 23 constitutes a vibration device together with hydraulic cylinders 24 and 25 described later, and compensates for smooth sliding displacement (vibration) of the mudguard cover 21 in the direction of arrow A in FIG. It is.

Reference numerals 24 and 25 denote left and right hydraulic cylinders, which are located on the left and right sides of the round body 9 and are provided between the center frame 8 and the mudguard cover 21 and serve as vibration actuators. The hydraulic cylinders 24 and 25 are configured as so-called self-excited hydraulic vibrators as described later.

Here, the left hydraulic cylinder 24 includes a tube 24A fixedly attached to the leg 10 of the center frame 8 in the left and right directions as shown in FIGS.
A piston 24B slidably inserted into the tube 24A and a rod 24C whose base end is fixed to the piston 24B and whose distal end projects outside the tube 24A. And the piston 24B
Defines the interior of the tube 24A as two oil chambers 24D and 24E.

The hydraulic cylinder 24 has a rod 24C.
The protruding end side is, for example, a bifurcated mounting bracket 24F. The mudguard cover 21 is fastened to the mounting bracket 24F by sandwiching the inner end 21A of the mudguard cover 21 between the mounting bracket 24F.

The hydraulic cylinder 24 has substantially the same configuration as the vibration device described in, for example, JP-A-2000-37661. That is, the hydraulic cylinder 24
The pressure oil is supplied / discharged to / from the oil chambers 24D and 24E via a hydraulic pilot type switching valve (not shown) using self-pressure, and the rod 24C vibrates in a self-excited manner at a constant cycle. The entire mudguard cover 21 integrated with the rod 24C is vibrated in the directions indicated by arrows A (left and right) shown in FIG. In this case, the mudguard cover 2
The vibration frequency added to 1 is desirably set to, for example, about 20 to 100 Hz.

The hydraulic cylinder 25 on the right side is constructed in substantially the same manner as the hydraulic cylinder 24.
A, piston 25B, rod 25C, oil chamber 25D, 25
E and a mounting bracket 25F.

Next, referring to FIG.
A control circuit for controlling the operation of the control unit 25 will be described.

Reference numeral 26 denotes a hydraulic pump which constitutes a hydraulic source together with a tank 27. The hydraulic pump 26 is housed in the building cover 3 of the upper revolving unit 2 and is driven to rotate by the prime mover to operate the tank 27. The oil is supplied to and discharged from the hydraulic cylinders 24 and 25 as high-pressure oil.

Reference numeral 28 denotes a center joint as a rotary joint provided between the lower traveling unit 1 and the upper revolving unit 2 and located in the round body 9 as shown in FIGS. An outer valve 28A provided on the lower traveling structure 1 side, and an inner valve 28B provided on the upper revolving structure 2 and rotatably inserted into the outer valve 28A.
It is composed of And the center joint 28
Are main pipes 29A, which will be described later, disposed on the upper revolving unit 2 side.
29B and a main pipeline 30 described later provided on the lower traveling body 1 side.
A and 30B are connected to each other.

Numerals 29A and 29B are located on the upper revolving unit 2 side and are provided with a hydraulic pump 26, a tank 27 and a center joint 28.
And a pair of main pipelines 30A and 30B located between the lower traveling body 1 and the oil chambers 24E and 25D of the hydraulic cylinders 24 and 25 and the center joint 28. Other main lines, these main lines 29A, 29
B, 30A, and 30B connect the oil chambers 24E and 25D of the hydraulic cylinders 24 and 25 to the hydraulic pump 26 and the tank 27 via the center joint 28.

Reference numerals 31A and 31B denote a pair of branch conduits branched from the main conduits 30A and 30B.
A and 31B are connected to an oil chamber 25E of the hydraulic cylinder 25 and an oil chamber 24D of the hydraulic cylinder 24, respectively.

Reference numeral 32 denotes a solenoid valve provided as a switching valve provided in the middle of the main pipe line 29B. The solenoid valve 32 is, for example, a spring return type electromagnetic pilot type switching valve having two ports and two positions. , 25 to the hydraulic pump 26 in the closed position (a). The solenoid valve 32 connects the hydraulic cylinders 24 and 25 to the hydraulic pump 26 when a current serving as a control signal from the power supply 33 is supplied to the electromagnetic pilot unit 32A via a pressure switch 36, a time limit timer 38, and the like. The valve is switched to the valve opening position (b) that communicates with the valve.

A power switch 35 is provided in the middle of a wiring 34 for connecting the power supply 33 to the solenoid valve 32. The power switch 35 is closed when the engine is started. The current is supplied to the electromagnetic pilot portion 32A of the solenoid valve 32.

A pressure switch 36 is provided between the solenoid valve 32 and the power switch 35 and provided in the middle of the wiring 34. The pressure switch 36 includes, for example, a case 36A,
The telescopic rod 36B is provided in the case 36A so as to be able to expand and contract, an urging spring 36C that constantly urges the telescopic rod 36B in the reducing direction, and a switch portion 36D provided at the tip of the telescopic rod 36B. I have. Case 3
An oil chamber 36E is defined between 6A and the telescopic rod 36B.

Then, the case 36A of the pressure switch 36
A pilot pipe 37 is connected to the pilot pipe 37. In the pilot pipe 37, pressure oil used for operating the hydraulic motor 17, for example, a hydraulic pilot type switching valve (not shown) used for the hydraulic motor 17 is switched and controlled. A part of the pilot pressure is introduced.

Therefore, when the vehicle travels by operating the hydraulic motor 17 by the hydraulic pilot switching valve, the pilot pressure is supplied to the oil chamber 36E of the pressure switch 36 through the pilot pipe 37, thereby expanding and contracting. The rod 36B extends, and the switch 36D is opened.

On the other hand, when the traveling is stopped by the hydraulic pilot type switching valve, the supply of the pilot pressure into the oil chamber 36E is stopped, and the telescopic rod 36B is contracted by the urging spring 36C, and accordingly, the switch unit is turned off. 36D is closed.

Numeral 38 denotes a time limit timer which is located between the solenoid valve 32 and the pressure switch 36 and is provided in the middle of the wiring 34 as timer means. And are electrically connected. When the pressure switch 36 is closed and the current is supplied to the electromagnetic pilot portion 32A of the electromagnetic valve 32 for a predetermined fixed time limit T of, for example, about several tens of seconds, the time limit timer 38 The power supply 33 is electrically cut off, and the supply of current to the electromagnetic pilot unit 32A is stopped.

The time limit timer 38 is controlled by the solenoid valve 3
2, power supply 33, power switch 35 and pressure switch 3
6 together with, for example, a fuel tank (not shown) of the upper swing body 2.

Reference numeral 39 denotes a relief valve provided in the middle of the main lines 29A and 29B. The relief valve 39 opens when the pressure in the main line 29B rises to a set relief pressure, and the relief valve 39 opens. A part of the oil liquid in the tank is returned to the tank 27.

The tracked vehicle according to the present embodiment has the above-described configuration. Next, the operation of the vehicle will be described with reference to FIGS.

First, when the engine is stopped,
Since the supply of the pilot pressure to the pilot pipe 37 is stopped, the pressure switch 36 is closed. Then, at this time, the power switch 35 is opened by stopping the engine, so that the solenoid valve 32 is maintained at the valve closing position (a).

Next, when the engine is started and the power switch 35 is closed before stopping the traveling, the current is supplied to the electromagnetic pilot portion 32A of the solenoid valve 32 by the time limit timer 38 for a fixed time limit T. Can keep the solenoid valve 32 at the valve opening position (b).

Thus, the hydraulic oil is supplied to and discharged from the hydraulic cylinders 24 and 25 from the hydraulic pump 26.
The mudguard cover 21 integrated with 4, 25
Only by vibrating in the direction of arrow A shown in FIG. 5, mud and the like adhering to the mudguard cover 21 before traveling is stopped can be discharged to the outside.

Next, when traveling by operating the hydraulic motor 17, the pressure switch 36 is opened by the pilot pressure from the pilot pipe 37, whereby the supply of current to the solenoid valve 32 is cut off, The valve 32 switches to the closed position (a).

As a result, during traveling, the hydraulic cylinder 2
The operations of the mudguard covers 21 can be stopped by stopping the operations of the mudguard covers 21, and noise and the like due to the vibration of the mudguard covers 21 can be prevented.

In this embodiment, the mudguard cover 21 is arranged above the track frame 7 and the mudguard cover 21 is inclined obliquely downward toward the outside in the width direction. Mud, etc., which is scraped up by the
Can be smoothly discharged to the outside along the direction of inclination of.

Next, when the travel is stopped by stopping the hydraulic motor 17, the time limit timer 38 opens the solenoid valve 32 for a fixed time limit T by the time limit timer 38 in the same manner as when the engine is started. And during this time the hydraulic cylinder 2
4, 25 can be activated.

After the time limit T has elapsed, the supply of current to the solenoid valve 32 is cut off by the time limit timer 38, and the solenoid valve 32 is switched to the closed position (a) to operate the hydraulic cylinders 24, 25. Can be stopped.

Thus, in the present embodiment, even if the mud adhering to the crawler belt 18 or the like during the traveling falls and adheres to the mudguard cover 21 with a time delay after the traveling is stopped, the mudguard cover 21 is kept constant by the hydraulic cylinders 24 and 25. And the mud and the like adhering to the mudguard cover 21 can be actively discharged to the outside.

This makes it possible to simplify the work of removing mud and the like performed during the maintenance work of the hydraulic excavator, reduce the burden on the rental and leasing companies of the hydraulic excavator, and simplify the car washing operation and the like. Then, the excavator can be kept in a clean state, and its appearance quality can be improved.

Since the solenoid valve 32, the power supply 33, the power switch 35, the pressure switch 36, the time limit timer 38 and the like are mounted on the fuel tank side of the upper revolving unit 2,
These maintenance operations can be easily performed from outside the upper swing body 2.

Next, FIG. 9 shows a second embodiment of the present invention. In the present embodiment, the same components as those in the above-described first embodiment are denoted by the same reference numerals, and the description thereof will be omitted. Shall be omitted.

The feature of this embodiment is that the solenoid valve 5
1, a power supply 52, a wiring 53, a power switch 54, a pressure switch 55, a time limit timer 56, and the like are mounted together on the lower traveling body 1 side.

Here, the electromagnetic valve 51 is configured substantially similarly to the electromagnetic valve 32 according to the first embodiment, and has an electromagnetic pilot portion 51A. The solenoid valve 51 is provided in the middle of the main conduit 30A on the lower traveling body 1 side, and is closed at a valve closing position (c) according to the current supplied to the electromagnetic pilot unit 51A.
Is switched to the valve opening position (d).

The pressure switch 55 has a case 55 similar to the pressure switch 36 according to the first embodiment.
A, telescopic rod 55B, biasing spring 55C, switch section 5
5D and an oil chamber 55E. The pressure switch 55 opens the switch portion 55D by supplying, for example, high-pressure side pressure oil of the pressure oil supplied to and discharged from the hydraulic motor 17 from the hydraulic pump 26 to the oil chamber 55E through the pilot pipe 57. Things.

Thus, in the present embodiment configured as described above, substantially the same operation and effect as those of the first embodiment can be obtained.

In particular, in the present embodiment, the solenoid valve 51, the power supply 52, the wiring 53, the power switch 54, the pressure switch 5
5. Since the time limit timer 56 and the like are mounted together on the lower traveling body 1 side, these can be accommodated in, for example, the round body 9 of the lower traveling body 1 and the mounting space and the like for these can be reduced. It can be easily secured inside.

In the first embodiment, the pressure switch 36 is used as the switch means, and the switching operation of the pressure switch 36 is performed by directly guiding the pressure oil in the pilot pipe 37 to the pressure switch 36. Although the case has been described as an example, instead of this, for example, the pressure in the pilot pipe is detected using a pressure sensor or the like, and the switch means is configured by a switch that is switched by an electric signal from the pressure sensor. You may. This is also true for the second embodiment.

Further, in each embodiment, the case where the solenoid valve is used as the switching valve has been described as an example. Alternatively, for example, a hydraulic pilot type switching valve may be used as the switching valve and the time limit timer may be used. The switching operation of the switching valve may be performed by converting an electric signal into a hydraulic signal and outputting the hydraulic signal to the hydraulic pilot switching valve.

Further, in the first embodiment, the case where the time limit T of the time limit timer 38 is set to about several tens of seconds has been described as an example. Alternatively, the time limit T may be set to about several minutes. Or may be set to about several seconds. This is the same in the second embodiment.

Further, in each of the embodiments, the excavator has been described as an example of a tracked vehicle, but the present invention is not limited to this, and is widely applied to other tracked vehicles such as hydraulic cranes and bulldozers. Applicable.

[0082]

As described above in detail, according to the first aspect of the present invention, a mudguard cover is provided between the track frame and the crawler belt, and a vibrating cover is provided between the mudguard cover and the track frame. In addition to providing an actuator, a switching valve is provided in the middle of the pipeline connecting the vibration actuator to the hydraulic source, and the switch means allows a control signal to be output to the switching valve when the hydraulic motor is stopped, and switches when the hydraulic motor is operating. Since the output of the control signal to the valve is stopped,
When the running of the vehicle is stopped, the excitation actuator can be operated to vibrate the mudguard cover.

Thus, even if the mud adhering to the crawler belt or the like during traveling is dropped and adheres to the mudguard cover with a time delay after traveling is stopped, the vibrating actuator actively discharges the mud adhered to the mudguard cover to the outside. Can,
At the time of vehicle maintenance work, the work of removing mud and the like can be simplified, and workability can be improved. Further, the vibration of the mudguard cover can be stopped when the vehicle is running, and the generation of noise due to such vibration can be prevented.

According to the second aspect of the present invention, the switch means is constituted by a pressure switch provided in the middle of the wiring for connecting the switching valve to the power supply. It can be automatically and accurately performed, and the reliability and the like of the switch means can be improved by the pressure switch.

Further, according to the third aspect of the present invention, when the control signal is output to the switching valve for a predetermined period of time, the output of the control signal is stopped by the timer means. Thereafter, the operator does not need to manually perform a switch operation to stop the vibration actuator, and the operability of the vibration actuator can be improved.

Further, according to the fourth aspect of the present invention, since the switching valve, the switch means, and the timer means are mounted on the upper revolving unit, maintenance of these switching valves and the like can be easily performed from outside the upper revolving unit. .

Further, according to the fifth aspect of the present invention, since the switching valve, the switch means and the timer means are mounted on the track frame side, these switching valves and the like can be accommodated in, for example, a round body of the track frame. These mounting spaces and the like can be easily secured in the round body.

[Brief description of the drawings]

FIG. 1 is an overall view showing a hydraulic excavator applied to a first embodiment of the present invention.

FIG. 2 is an enlarged front view showing a lower traveling body in FIG. 1;

FIG. 3 is a perspective view showing a track frame, a mudguard cover, and the like in FIG. 2;

FIG. 4 is a plan view of FIG. 2 showing a track frame, a mudguard cover, a hydraulic cylinder, and the like.

5 is a cross-sectional view of a side frame, a mudguard cover, and the like, which are enlarged in a direction indicated by arrows VV in FIG.

FIG. 6 is a cross-sectional view of the guide of the mudguard cover, which is enlarged from a VI-VI direction in FIG.

FIG. 7 is a hydraulic circuit diagram for operating the hydraulic cylinder according to the first embodiment.

FIG. 8 is a time chart showing operating states of a power switch, a pilot pipe, a pressure switch, a time limit timer, and a solenoid valve according to the first embodiment.

FIG. 9 is a hydraulic circuit diagram for operating a hydraulic cylinder according to a second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lower traveling body 2 Upper revolving superstructure 7 Track frame 11 Side frame 15 Idle wheel 16 Drive wheel 17 Hydraulic motor 18 Crawler track 21 Mudguard cover 24, 25 Hydraulic cylinder (vibration actuator) 26 Hydraulic pump (hydraulic power source) 27 Tank (hydraulic) Source) 29A, 29B, 30A, 30B Main line 31A, 31B Branch line 32, 51 Solenoid valve (switching valve) 32A, 51A Electromagnetic pilot section 33, 52 Power supply 34, 53 Wiring 36, 55 Pressure switch (switch means) 38 , 56 Time limit timer (timer means) a, c Valve closing position b, d Valve opening position T Time limit time

Claims (5)

[Claims] 1. A track frame having side frames provided on both left and right sides of a center frame, idler wheels provided on one side in front and rear of the side frames, and front and rear of each side frame. A drive wheel provided on the other side of the direction and driven by a hydraulic motor for traveling, a crawler belt wound between the idler wheel and the drive wheel, and a crawler belt provided on the track frame and an upper surface of the side frame. And a mudguard cover that covers the track frame from above, and is provided between the track frame and the mudguard cover by supplying and discharging pressure oil from a hydraulic power source. A vibrating actuator for vibrating the mudguard cover; and a vibrating actuator that is provided in the middle of a pipe connecting the vibrating actuator to a hydraulic pressure source. A switching valve that is switched to an open position that connects the vibrating actuator to a hydraulic pressure source when a control signal is output from the outside at a valve closing position that shuts off the hydraulic motor and the hydraulic motor; A tracked vehicle comprising: switch means for permitting output of a control signal to the switching valve when stopped, and stopping output of the control signal to the switching valve when the hydraulic motor operates. 2. The switch means is provided in the middle of a wiring connecting the switching valve to a power supply, is normally closed, and is opened when a part of pressure oil for operating the hydraulic motor is supplied. 2. A pressure switch comprising:
A tracked vehicle according to claim 1. 3. The track-mounted type according to claim 1, further comprising timer means for stopping the output of the control signal when the control signal is output to the switching valve for a predetermined period of time. vehicle. 4. The track frame is a track frame that constitutes a lower traveling unit of a hydraulic shovel, and the switching valve, the switch unit, and the timer unit are attached to an upper revolving unit that is pivotally mounted on the track frame. The tracked vehicle according to claim 3. 5. The track-type truck according to claim 3, wherein said track frame is a track frame constituting a lower traveling body of a hydraulic shovel, and said switching valve, switch means and timer means are mounted on said track frame side. vehicle.