JP2002178960A - Crawler type vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automatically vibrate a mud cover if there is mud stuck on the mud cover. SOLUTION: A truck frame 8 is provided with a hydraulic cylinder 27 and a cover support plate 22 is integrally attached to the hydraulic cylinder 27. The mud cover 25 is provided on the cover support plate 22 via a suspension spring 24 which is elastic support. Further, a detecting switch 34 consisting of a fixed contact 34A and a movable contact 34B is provided between the support plate 22 and the mud cover 25. Thus, if there is mud 26 stuck on the mud cover 25, the suspension spring 24 contracts to displace the mud cover 25 toward the support plate 22. Then the switch 34 is closed so that the mud cover 25, integrated with the hydraulic cylinder 27, is vibrated in response to a detection signal from the switch 34.

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 shovel is composed of a track frame having side frames provided on both left and right sides of a center frame, and one side in front and rear of the side frames. Idler wheels provided on the
The vehicle includes a drive wheel provided on the other side in the front and rear directions of the side frame, and a crawler belt wound between the idler wheel and the drive wheel.

In this type of tracked vehicle according to the prior art, drive wheels provided on a side frame of a truck frame are rotationally driven by a traveling hydraulic motor or the like, and a crawler belt orbits between idler wheels and drive wheels. This causes the vehicle to move forward or backward.

By the way, in such a tracked vehicle, when traveling on muddy ground, for example, mud and the like scraped up by the crawler belt tend to accumulate between the side frame and the crawler belt. Smooth rotation of the upper roller is hindered by the mud, and the running performance is likely to be reduced.

Therefore, in such a track-mounted vehicle, earth discharging members are provided on the idle wheel side and the drive wheel side of the side frame,
2. Description of the Related Art There is known a configuration in which muddy soil adhered to the inside of a crawler belt is discharged so as to be scraped off by a discharging member when the crawler belt is driven. (For example, JP-A-8-310457).

Another tracked vehicle has a structure in which a mudguard cover that covers a side frame from above is disposed between a track frame and a crawler belt, and the mudguard cover is vibrated by using a vibration actuator. Some are known (for example, JP-A-2000-247269).

In this tracked vehicle, the mudguard cover is vibrated by a vibration actuator during running or the like, so that mud falling from the crawler belt to the mudguard cover is discharged to the outside. It prevents mud from accumulating in between.

[0008]

In the prior art described in Japanese Patent Application Laid-Open No. Hei 8-310457, since the earth discharging member is merely provided on the side frame, for example, when traveling on muddy ground or the like. It is difficult to sufficiently discharge the mud adhering to the crawler belt, and the mud often accumulates between the crawler belt and the crawler belt on the upper surface side of the side frame.

[0009] In particular, when traveling on a soft ground made of mud having high viscosity, 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, 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.

The prior art described in Japanese Patent Application Laid-Open No. 2000-247269 has only a function of vibrating the mudguard cover by operating the vibrating actuator during traveling. It is not necessarily configured to efficiently discharge incoming mud.

In this case, it is possible for the operator in the cab to manually operate the switch to start and stop the vibration actuator. However, if the operator continues running with the vibration actuator stopped, mud may adhere to the mudguard cover without the operator noticing, and the mud once adhered to the mudguard cover will be Even when the actuator is operated, it is necessary to wash the mudguard cover with water or the like, which causes a problem that workability is deteriorated.

On the other hand, in the case where the mudguard cover is vibrated by operating the vibrating actuator in advance when the vehicle is running, the vibrating actuator is operated extra before muddy soil adheres to the mudguard cover. There is a problem that energy is wasted.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to automatically vibrate the mudguard cover when mud falls onto the mudguard cover, and to prevent the mudguard cover from being vibrated. Can efficiently discharge mud to the outside,
It is an object of the present invention to provide a tracked vehicle capable of simplifying the work of removing mud and improving appearance quality.

[0015]

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 side frame, and a crawler belt wound between the idler wheel and the drive wheel; A mudguard cover provided on the track frame between the upper surface of the side frame and the crawler belt to cover the track frame from above, and a vibration actuator for vibrating the mudguard cover.

A feature of the structure adopted by the first aspect of the invention is that a mud detecting means for detecting whether mud adheres to the mud cover is provided between the track frame and the mud cover. The vibrating actuator is configured to operate or stop according to a detection signal from the mud detecting means.

With this configuration, when mud or the like adheres to the mudguard cover, the mud detecting means detects that mud has adhered to the mudguard cover, and the vibrating actuator is operated in accordance with the detection signal at this time. Activate,
As a result, the mud on the mudguard cover can be discharged to the outside.

According to a second aspect of the present invention, the vibrating actuator comprises a hydraulic cylinder which is operated by supplying and discharging pressure oil from a hydraulic pressure source, and the mud detecting means includes a mud guard on the mudguard cover. The hydraulic cylinder comprises a detection switch that opens and closes depending on whether or not the hydraulic oil is supplied from the hydraulic source according to a detection signal from the detection switch. A vibration control valve for supplying and discharging the air is provided.

With this configuration, when mud or the like adheres to the mudguard cover, the detection switch is closed, and a detection signal is output to the vibration control valve. As a result, the pressure oil from the hydraulic pressure source is supplied to and discharged from the vibration actuator by the vibration control valve, and the vibration actuator can be operated.

According to a third aspect of the present invention, there is provided a cover support between the track frame and the mudguard cover which supports the mudguard cover from below and is vibrated together with the mudguard cover by a vibration actuator. The mud detecting means is provided between the cover support and the mudguard cover, and detects that the mudguard cover is displaced up and down with respect to the cover support.

With this configuration, when mud or the like adheres to the mudguard cover, the mudguard cover is displaced by the weight of the mud so as to approach the cover support downward, and the displacement of the mudguard cover is changed. It can be detected by the detecting means.

Further, the invention according to claim 4 is characterized in that an elastic support for elastically supporting the mudguard cover is provided between the cover support and the mudguard cover. With such a configuration, when mud or the like adheres to the mudguard cover, the elastic support is elastically deformed by the weight of the mud, so that the mudguard cover is displaced downward so as to approach the cover support. Can be done.

Further, according to the invention of claim 5, the mudguard cover is made of a flat plate material which is elastically deformed in accordance with the weight of the mud. With this configuration, when mud adheres to the mudguard cover, the mudguard cover itself is elastically deformed by the weight of the mud, so that the mudguard cover can be displaced downward toward the cover support.

On the other hand, according to the invention of claim 6, the mudguard cover is connected to the cover support so as to be foldable. With such a configuration, when the mudguard cover is connected to the cover support so as to be foldable, when the cover support and the mudguard cover are assembled on the track frame side, these cover supports are used. This eliminates the need to separately install the mudguard cover.

[0025]

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 6 show a first embodiment of the present invention, wherein 1 is a traveling body of a hydraulic shovel, 2 is a revolving body mounted on the traveling body 1 so as to be able to pivot. The revolving unit 2 has a revolving frame 3, which is provided with, for example, a building cover 4 containing a motor and the like, a cab 5 defining a cab, a counterweight 6, and the like. A working device 7 is provided on the front side of the revolving unit 2 so as to be able to move up and down.

Reference numeral 8 denotes a track frame constituting a main body of the traveling body 1. The track frame 8 is formed as shown in FIGS. 2 to 4 by welding a steel plate or the like.
A center frame 9 located at the center;
And a side frame 12 which is provided on both left and right sides and extends forward and backward.

Here, the center frame 9 is composed of a central round body 10 and legs 11 extending frontward, rearward, left and right from the outer peripheral side of the round body 10 to form an H-shape as a whole. ing. The leg portion 11 is formed as a can-made structure by an upper plate portion 11A, a lower plate portion 11B, and a side plate portion 11C connecting these plate portions 11A and 11B in an upward and downward direction.

Reference numerals 12 and 12 denote legs 11 of the center frame 9.
2 and 4, the side frame 12 is formed as a substantially U-shaped frame extending forward and backward as shown in FIGS. I have. The side frame 12 includes an upper plate portion 12A in which the left and right widthwise middle portions are bent in a V-shape, and a widthwise inner end of the upper plate portion 12A (a right end in FIG. 3). An inner side plate portion 12B extending downward and an upper plate portion 12A
And an outer side plate portion 12C extending downward from the outer end of the outer side plate.

An end plate 13 is provided at one end of the side frame 12 in the front and rear directions, and an idling wheel bracket 14 is integrally provided on the end plate 13. An end plate 15 is also provided on the other end side in the front and rear directions of the side frame 12, and a drive wheel bracket 16 is integrally provided on the end plate 15.

Reference numeral 17 denotes an idle wheel provided on the idle wheel bracket 14 at one side in the front and rear directions of the side frame 12, and 18 denotes a drive wheel located at the other side in the front and rear directions of the side frame 12. The drive wheels provided on the bracket 16 are rotationally driven by a traveling hydraulic motor (not shown) or the like.

Reference numeral 19 denotes left and right crawler belts (only one of which is shown) wound between the idler wheel 17 and the drive wheel 18. The crawler belt 19 is provided between the idler wheel 17 and the drive wheel 18. The upper and lower sides of the side frame 12 extend forward and rearward. The crawler belt 19 drives and drives the traveling body 1 by rotating and driving the drive wheels 18 with the traveling hydraulic motor.

Reference numerals 20 and 20 denote upper rollers which are provided on the upper plate portion 12A of the side frame 12 so as to be separated from the front and rear sides thereof. These upper rollers 20 guide the crawler belt 19 above the side frame 12 and Is to compensate for the smooth movement of. Are lower rollers provided on the lower side of the side frame 12, and these lower rollers 21
The crawler belt 19 is guided below the side frame 12 to increase the contact area of the crawler belt 19 with the ground, and to smoothly operate the crawler belt 19 along the ground.

Reference numerals 22 and 22 denote left and right cover support plates as cover supports provided between the track frame 8 and a mudguard cover 25 which will be described later. As shown, it is formed in a flat plate shape using a steel plate or the like, and is integrally attached to a rod 27C of a hydraulic cylinder 27 described later. A plurality of guides 23 (only one is shown) are provided between the cover support plate 22 and the side frame 12.
Is to compensate for the sliding displacement of the mudguard cover 25 in the direction of arrow A in FIG.

The guide 23 is fixed to the upper plate 12A of the side frame 12 in substantially the same manner as the guide described in, for example, Japanese Patent Application Laid-Open No. 2000-247269 filed by the present applicant. It is composed of a rail 23A and a slider 23B fixed to the lower surface side (back surface side) of the cover support plate 22 and slidably fitted to the guide rail 23A.

The cover support plate 22 is vibrated together with the mudguard cover 25 by the hydraulic cylinder 27 while supporting the mudguard cover 25 from below through a suspension spring 24 described later.

, 24, 24,...
The suspension spring 24 includes, for example, a coil spring and an oil damper. The suspension spring 24 includes a coil spring and an oil damper. It is attached to the cover 25 so as to be able to expand and contract. The suspension spring 24 functions as an elastic support for elastically supporting the mudguard cover 25 on the cover support plate 22.

Reference numerals 25 and 25 denote side frames 12 and cover belts 1.
9 and the left and right mudguard covers provided on the track frame 8.
As shown in FIGS. 2 to 5, for example, it is formed as a substantially rectangular flat body using a rolled steel material (SS material) for general structure and attached to a suspension spring 24 on a cover support plate 22.

The mudguard cover 25 is disposed obliquely downward from the center frame 9 side to the side frame 12 side, and covers the legs 11 and the side frame 12 of the center frame 9 from above, thereby being scraped up by the crawler belt 19. The mud 26 and the like are prevented from falling on the upper plate 11A of the leg 11 and the upper plate 12A of the side frame 12, and the mud 26 is vibrated by the hydraulic cylinder 27.
And the like are discharged to the outside along the inclination direction of the mudguard cover 25.

2 and FIG.
As shown in FIG. 5, square notches 25A, 25A are formed at positions corresponding to the upper roller 20. The notch 25A is used to connect the mudguard cover 25 to the hydraulic cylinder 2.
This prevents the mudguard cover 25 from interfering with the upper roller 20 when vibrating by 7.

Here, as shown in FIG.
In a no-load state where no load is applied from the outside, the suspension spring 24 keeps the distance between the cover support plate 22 and the mudguard cover 25 at L.

On the other hand, when the mud 26 is deposited on the mud cover 25 as shown in FIG. 5, a load F due to the weight of the mud 26 is applied to the mud cover 25, and the suspension spring 24 is accordingly reduced. Then, the mudguard cover 25 moves so as to approach the cover support plate 22 side. When the load F due to the mud 26 exceeds a predetermined set value f (F> f), the interval between the cover support plate 22 and the mudguard cover 25 is reduced to L 'as shown in FIG. Can be

Reference numerals 27, 27... Denote hydraulic cylinders provided between the track frame 8 and the mudguard cover 25 as vibrating actuators.
As shown in FIG. 2, a total of four are arranged on the leg portion 11 of the center frame 9 so as to be separated from the front, rear, left and right.

Here, the hydraulic cylinder 27 is fixed to the leg 11 of the center frame 9 as shown in FIG. 3, and is arranged obliquely in the left and right directions, and slides inside the tube 27A. Piston 27 movably inserted
B and a rod 27C whose base end is provided integrally with the piston 27B and whose distal end protrudes outside the tube 27A.

The piston 27B has a tube 27A.
Is defined by two oil chambers 27D and 27E. The cover support plate 22 is integrally attached to the rod 27C protruding end side of the hydraulic cylinder 27 using bolts (not shown) or the like. And this hydraulic cylinder 2
Reference numeral 7 denotes a unit in which pressure oil from a hydraulic pump 28 described later is supplied and discharged according to a detection signal from a detection switch 34 described later, and the rod 27C is repeatedly expanded and contracted to vibrate the cover support plate 22 together with the mudguard cover 25. It is.

Next, a control circuit for controlling the operation of the hydraulic cylinder 27 will be described with reference to FIG.

Reference numeral 28 denotes a hydraulic pump which constitutes a hydraulic power source together with a tank 29. The hydraulic pump 28 is accommodated in the building cover 4 of the revolving unit 2 and is driven to rotate by a prime mover so that hydraulic oil in the tank 29 is rotated. Is supplied to the hydraulic cylinder 27 and the like as high-pressure oil.

Reference numeral 30 denotes a center joint as a rotary joint provided between the traveling body 1 and the revolving body 2 as shown in FIGS. 1 and 6, and the center joint 30 is an outer valve provided on the traveling body 1 side. 30A and an inner valve 30B provided on the revolving structure 2 side and rotatably inserted into the outer valve 30A. The center joint 30 connects pipes 31A and 31B described later provided on the revolving unit 2 side and pipes 32A and 32B described later provided on the traveling body 1 side.

Reference numerals 31A and 31B denote a pair of conduits located between the revolving unit 2 and the hydraulic pump 28, the tank 29 and the center joint 30, and 32A and 32B denote the traveling unit 1.
These are a pair of other pipelines located on the side between the oil chambers 27D and 27E of the hydraulic cylinder 27 and the center joint 30.

Numeral 33 denotes a hydraulic cylinder control valve as a vibration control valve provided on the side of the lower traveling body 1 in the middle of the pipelines 32A and 32B.
Is constituted, for example, by a four-port three-position electromagnetic directional control valve. The hydraulic cylinder control valve 33 is connected to a controller 35 which will be described later, and in accordance with a detection signal from a detection switch 34 via the controller 35, a flow direction of the hydraulic oil supplied to and discharged from the hydraulic cylinder 27 from the hydraulic pump 28. Are switched at a constant cycle to extend and retract the rod 27C.

Reference numerals 34, 34,... Are detection switches which are located between the track frame 8 and the mudguard cover 25 and are provided between the cover support plate 22 and the mudguard cover 25 and serve as mud detecting means. As shown in FIG. 2, for example, three switches 34 are disposed at front and rear sides of each mudguard cover 25 at a substantially middle position in the left and right directions and separated from each other. The detection switch 34 includes a fixed contact 34A provided on the upper surface of the cover support plate 22 and a movable contact 34B provided on the lower surface of the mudguard cover 25, as shown in FIGS. Have been.

When the load is not applied to the mudguard cover 25 and the load is not applied to the mudguard cover 25 as shown in FIG. 3, the fixed contact 34A and the movable contact 34B are separated from each other and are kept open. .

When the mud 26 adheres to the mud cover 25 and the load F due to the weight of the mud 26 becomes larger than the set value f, the mud cover 25 approaches the cover support plate 22 as shown in FIG. As a result, the distance between the cover support plate 22 and the mudguard cover 25 becomes L ', and the movable contact 34B comes into contact with the fixed contact 34A and is closed. That is, the detection switch 34 detects whether or not the mud 26 has adhered to the mudguard cover 25 by using the upward and downward displacements of the mudguard cover 25 and outputs this detection signal to the controller 35.

Reference numeral 35 denotes a controller provided on the traveling body 1 side.
B, the fixed contact 34 of the detection switch 34
A, and is connected to the movable contact 34B. The controller 35 converts a detection signal from the detection switch 34 into a control signal for switching and controlling the hydraulic cylinder control valve 33 and outputs the control signal to the hydraulic cylinder control valve 33.

The hydraulic shovel according to the present embodiment has the above-described configuration. When the vehicle is traveling on a road, the drive wheels 18 are rotated by a traveling hydraulic motor or the like, so that the crawler belt 19 is rotated by the idler wheels 17 and the drive wheels 18. Circulating between and
The vehicle is driven forward, backward, and the like.

Here, for example, when traveling on a soft ground having a high viscosity, the mud 26 adhered to the crawler belt 19 frequently falls on the mudguard cover 25. And mudguard cover 2
When the load F of the mud 26 applied to the mudguard cover 25 exceeds the set value f (F> f) when the weight of the mud 26 attached to the top 5 increases, as shown in FIG.
4 is reduced and the mudguard cover 25 is
2, and the detection switch 34 is closed.

As a result, the detection signal from the detection switch 34 via the controller 35 is transmitted to the control valve 3 for the hydraulic cylinder.
3 and the hydraulic cylinder 27 is supplied with pressure oil from the hydraulic pump 28 to automatically vibrate the mudguard cover 25 in the direction of arrow A shown in FIG. The adhering mud 26 and the like can be efficiently discharged to the outside.

For this reason, during traveling, the track frame 8
Troubles such as accumulation of mud 26 and frozen soil between the crawler belt 19 and the crawler belt 19 can be solved, stable running can be performed, and the work of removing the mud 26 performed during the maintenance work of the excavator can be simplified. The burden on the leasing company and the like can be reduced, and the car washing operation and the like can be easily performed. And keep the excavator clean,
The appearance quality can be improved.

On the other hand, when no load is applied to the mudguard cover 25 from outside, the mudguard cover 25 is displaced away from the cover support plate 22 and the detection switch 34 is opened. As a result, the output of the detection signal from the detection switch 34 to the hydraulic cylinder control valve 33 via the controller 35 is stopped, and the vibration operation of the mudguard cover 25 by the hydraulic cylinder 27 can be automatically stopped.

Thus, in the present embodiment, when the mud 26 falls and adheres to the mud cover 25 from the crawler belt 19 during traveling or the like, the mud 26 added to the mud cover 25 is attached.
The mudguard cover 25 can be automatically and appropriately vibrated according to the magnitude of the load caused by the hydraulic cylinder 27, so that it is not necessary to always operate the hydraulic cylinder 27 during traveling, and the noise due to the operating noise of the hydraulic cylinder 27 is reduced. It is possible to save energy while saving energy.

Further, when the mud 26 adheres to the mudguard cover 25, the operator does not need to manually perform a switch operation to drive the hydraulic cylinder 27, and also eliminates such a problem that the switch operation is forgotten. The operability of the hydraulic cylinder 27 can be improved.

Next, FIGS. 7 and 8 show a second embodiment of the present invention. In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and The description is omitted.

However, the feature of this embodiment is that a plurality of fixing bases 41 (two pieces) are provided between the cover support plate 22 and the mudguard cover 25 instead of the suspension springs 24 described in the first embodiment. (Shown only) is provided, and when the mud 26 adheres to the mudguard cover 25, the mudguard cover 25 is elastically deformed with the plurality of fixing bases 41 as fulcrums (fixed ends).

Here, the fixing base 41 is fixedly attached to the upper surface side of the cover support plate 22, and the mudguard cover 2 is provided.
5 is supported on the cover support plate 22 so as to be elastically deformable.

Thus, also in the present embodiment configured as described above, the mud 26 adheres to the mud cover 25 as shown in FIG. 8, and the load F due to the weight of the mud 26 is applied to the mud cover 25. Mudguard cover 2
By elastically deforming 5 between the fixed bases 41, the detection switch 34 can be closed, and substantially the same operation and effect as in the first embodiment can be obtained.

Next, FIG. 9 shows a third embodiment of the present invention. In this embodiment, the same reference numerals are given to the same components as those in the first embodiment, and the description thereof will be omitted. It shall be.

However, the feature of this embodiment is that the mudguard cover 25 is connected to the cover support plate 22 via the hinge 51 so as to be foldable, and a suspension is provided between the cover support plate 22 and the mudguard cover 25. The configuration is such that a spring 52 and a detection switch 53 are provided.

Here, the hinge 51 is such that the left and right outer ends of the mudguard cover 25 are rotatably attached to the left and right outer ends of the cover support plate 22. Also,
The suspension spring 52 is mounted between the left and right inner ends of the cover support plate 22 and the left and right inner ends of the mudguard cover 25.

Further, the detection switch 53 has a fixed contact 53A and a movable contact 53B almost similarly to the detection switch 34 according to the first embodiment. The detection switch 34 is located near the suspension spring 52 and disposed between the cover support plate 22 and the mudguard cover 25.

Thus, also in the present embodiment configured as described above, when the mud adheres to the mudguard cover 25, the suspension spring 52 is reduced by the weight of the mud, and the mudguard cover 25 is thereby hinged. Can be rotated downward with the fulcrum as a fulcrum to close the detection switch 53, and it is possible to obtain substantially the same operation and effect as in the first embodiment.

In particular, in the present embodiment, the mudguard cover 2
Since the cover support plate 22 and the mudguard cover 25 are integrally connected to the cover support plate 22 via the hinge 51 so that the cover support plate 22 and the mudguard cover 25 can be assembled to the track frame 8, the cover support plate 22 and the mudguard cover 25 are connected to each other. It is not necessary to separately assemble 25, and workability at the time of assembling work can be improved.

In the first embodiment, the case where the suspension spring 24 is used as an elastic support for supporting the mudguard cover 25 on the cover support plate 22 has been described as an example. As in the modification shown in FIG. 10, rubber 61 may be used as the elastic support. This is the same for the third embodiment.

Further, in each of the embodiments, the case where the switch mechanism uses a contact-type switch that opens and closes by bringing the movable contact into contact with the fixed contact has been described as an example. A non-contact type switch using a photoelectric switch or the like that opens and closes according to the distance between the cover support plate and the mudguard cover may be used, or when mud adheres to the mudguard cover, A pressure-sensitive sensor that detects the pressure applied to the mudguard cover may be used.

Further, by providing electrodes on the upper surface side of the cover support plate and the lower surface side of the mudguard cover so as to face each other,
A capacitance type displacement sensor that detects the displacement amount of the mudguard cover with respect to the cover support plate may be used.

Further, in the first embodiment, the case where the mudguard cover 25 is connected to the cover support plate 22 using only the suspension spring 24 has been described as an example. As in the embodiment, the mudguard cover may be connected to the cover support plate using a suspension spring and a hinge. Also in the second embodiment, the mudguard cover may be connected to the cover support plate by using a fixed base and a hinge.

Further, in each of the embodiments, the case where the hydraulic cylinder 27 is used as the vibration actuator has been described as an example. Alternatively, the vibration may be performed using an electric actuator such as an electric motor. Actuator may be configured.

Further, in each of the embodiments, the excavator has been described as an example of a vehicle. However, the present invention is not limited to this, and can be applied to other tracked vehicles such as a hydraulic crane. .

[0078]

As described above in detail, according to the first aspect of the present invention, a mud detecting means for detecting whether mud adheres to the mudguard cover is provided between the track frame and the mudguard cover. Since the vibrating actuator for vibrating the mudguard cover is configured to operate or stop in accordance with a detection signal from the mud detecting means, the mudguard cover may be moved or the like depending on whether mud or the like adheres to the mudguard cover. Vibration can be automatically performed as appropriate, and it is not necessary to always operate the vibration actuator during traveling, so that the operability of the vibration actuator can be improved and energy can be saved.

Further, it is possible to solve the problem that mud and frozen soil are accumulated between the track frame and the crawler belt during running or the like, thereby enabling stable running and removing mud or the like performed during maintenance work of the tracked vehicle. Etc. can be simplified, and the appearance quality can be improved.

According to a second aspect of the present invention, the mud detecting means is constituted by a detection switch which is opened and closed depending on whether mud adheres to the mudguard cover, and vibrates according to a detection signal from the detection switch. The pressure control valve is switched to supply and discharge hydraulic oil to and from the hydraulic cylinder as the vibration actuator, so when mud or the like adheres to the mudguard cover, the detection switch is closed. Thus, the hydraulic cylinder can be continuously vibrated by the excitation control valve, and the mud on the mudguard cover can be smoothly discharged to the outside.

According to a third aspect of the present invention, a cover support for supporting the mudguard cover from below is provided between the track frame and the mudguard cover, and the mud detecting means is provided such that the mudguard cover is positioned above the cover support. When the mud, etc. adheres to the mudguard cover, it is detected whether the mud has adhered to the mudguard cover by using the displacement amount of the mudguard cover with respect to the cover support. Can be accurately detected by the mud detecting means.

Further, in the invention according to claim 4, an elastic support for elastically supporting the mudguard cover is provided between the cover support and the mudguard cover, so that when mud or the like adheres to the mudguard cover. The mudguard cover can be displaced by the elastic deformation of the elastic support, and the mud detecting means can more accurately detect whether or not mud has adhered to the mudguard cover.

Further, even when the mudguard cover is made of a flat plate material that is elastically deformed according to the weight of the mud, the mudguard cover itself is elastic when mud or the like adheres to the mudguard cover. The mudguard cover can be displaced by being deformed, so that it can be more accurately detected by the mud detecting means whether mud adheres to the mudguard cover.

Further, in the case where the mudguard cover is connected to the cover support so as to be foldable as in the invention of claim 6, when the cover support and the mudguard cover are assembled on the track frame side. This eliminates the need for separately assembling the cover support and the mudguard cover, thereby improving workability.

[Brief description of the drawings]

FIG. 1 is a front view showing a hydraulic shovel applied to an embodiment of the present invention.

FIG. 2 is an enlarged plan view showing a track frame, a mudguard cover, and the like in FIG. 1;

FIG. 3 shows a track frame, a cover support plate, a mudguard cover, a hydraulic cylinder, and the like as indicated by arrows III-III in FIG.
It is the expanded sectional view which expanded from the direction.

FIG. 4 is a perspective view showing a track frame, a cover support plate, a mudguard cover, and the like in FIG. 3;

FIG. 5 is a cross-sectional view similar to FIG. 3, showing a state in which mud has fallen on a mudguard cover.

FIG. 6 is a hydraulic circuit diagram for operating the hydraulic cylinder according to the first embodiment.

FIG. 7 is a cross-sectional view of a track frame, a cover support plate, a mudguard cover, a hydraulic cylinder, and the like according to a second embodiment as viewed from the same position as in FIG.

FIG. 8 is a cross-sectional view similar to FIG. 7, showing a state in which mud has fallen on a mudguard cover.

FIG. 9 is a cross-sectional view of a track frame, a cover support plate, a mudguard cover, a hydraulic cylinder, and the like according to a third embodiment as viewed from the same position as in FIG.

FIG. 10 is a sectional view of a track frame, a cover support plate, a mudguard cover, a hydraulic cylinder, and the like according to a modification of the present invention, as viewed from the same position as in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Running body 2 Revolving body 8 Track frame 9 Center frame 12 Side frame 17 Idler wheel 18 Drive wheel 22 Cover support plate (cover support) 24, 52 Suspension spring (elastic support) 25 Mudguard cover 26 Mud 27 Hydraulic cylinder Vibration actuator) 28 Hydraulic pump (Hydraulic source) 29 Tank (Hydraulic source) 31A, 31B, 32A, 32B Pipe line 33 Hydraulic cylinder control valve (Vibration control valve) 34, 53 Detection switch (Mud detection means) 51 Hinge 61 Rubber (elastic support)

Claims (6)

[Claims] 1. A track frame having side frames provided on both left and right sides of a center frame, an idle wheel provided on one side in front and rear of the side frames, and a front and rear direction of the side frames. A driving wheel provided on the other side, a crawler belt wound between the idler wheel and the driving wheel, and the track located on the track frame between an upper surface of the side frame and the crawler In a tracked vehicle including a mudguard cover that covers a frame from above and a vibration actuator that vibrates the mudguard cover, whether or not mud has adhered to the mudguard cover between the track frame and the mudguard cover And a mud detecting means for detecting the presence of the mud, and the vibrating actuator is configured to operate or stop according to a detection signal from the mud detecting means. Crawler type vehicle to be. 2. The vibrating actuator comprises a hydraulic cylinder that is operated by supplying and discharging pressure oil from a hydraulic source, and the mud detecting means determines whether mud adheres to the mudguard cover. In the middle of the pipeline connecting the hydraulic cylinder to a hydraulic power source,
2. The tracked vehicle according to claim 1, wherein a vibration control valve configured to supply and discharge pressure oil from the hydraulic source to a hydraulic cylinder in accordance with a detection signal from the detection switch is provided. 3. 3. A mud detecting means is provided between the track frame and the mudguard cover, the cover supporting body supporting the mudguard cover from below and being vibrated together with the mudguard cover by the vibrating actuator. The track-mounted system according to claim 1 or 2, wherein the track guard is disposed between the cover support and the mudguard cover, and detects that the mudguard cover is displaced up and down with respect to the cover support. vehicle. 4. The tracked vehicle according to claim 3, wherein an elastic support for elastically supporting the mudguard cover is provided between the cover support and the mudguard cover. 5. The tracked vehicle according to claim 3, wherein the mudguard cover is made of a flat plate material that is elastically deformed according to the weight of the mud. 6. The tracked vehicle according to claim 3, wherein the mudguard cover is foldably connected to the cover support.