JP2003020695A - Hydraulic shovel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve operability by making it easy to grasp an attitude of a front 11 by informing if it is in a revolving attitude within width or not. SOLUTION: Close to a cabin 4, a front state display device 28 comprising display lamps 30 and 31 is provided. The display lamp 30 is lighted or lighted off based on if the front 11 is at an offset position where it will not interfere with a canopy 8 within the width W of a lower structure 1 or not. The display lamp 31 is lighted or lighted off based on if the front 11 is in the revolving attitude within the width in which the front 11 is contained within a revolving radius R of an upper structure 2 or not. An operator is thus capable of speedily setting the front 11 in the revolving attitude within the width while checking the display lamps 30 and 31 for making revolving action in the revolving attitude within the width during excavating work. Operability is thus improved to smoothly perform civil engineering.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic excavator which is preferably used for excavating work such as earth and sand while performing a turning motion within a small turning radius corresponding to a vehicle width.

[0002]

2. Description of the Related Art Generally, there is a type of hydraulic excavator called an ultra-small swing type which is constructed so as to swing an upper swing body even in a narrow work site or the like (for example,
JP-A-11-336112, etc.).

An ultra-small swing type hydraulic excavator according to this type of prior art has an upper swing body which is swingably mounted on a lower traveling body, and the front of the upper swing body can be raised and lowered in a downward direction. It is provided. Further, on the swing frame of the upper swing body, a cab or a canopy (hereinafter, exemplarily referred to as a cab) located on the front left side of the swing frame, and a building cover housing the engine and the like located on the rear side of the cab. And a counterweight located on the rear end side of the revolving frame, which are formed in a substantially circular shape so as to fit within a virtual circle having a diameter smaller than 1.2 times the vehicle width, for example. There is. The radius of this virtual circle is set in advance as the turning radius of the upper swing body.

Further, in the ultra-small turning hydraulic excavator, the front bucket or the like is moved (offset) to the left side or the right side of the vehicle body so that excavation work such as diving can be performed at this position. There is also an offset boom type model.

In this case, the front is located, for example, on the right side of the cab and is attached to the revolving frame so that the lower boom can be raised and lowered, and the front end of the lower boom can be swung left and right. Upper boom attached to
An arm stay attached to the tip side of the upper boom so as to be swingable in the left and right directions, an arm attached to the tip side of the arm stay so as to be able to rotate upward and downward, and a tip side of the arm. It is composed of a bucket mounted so as to be rotatable in the upward and downward directions.

During excavation work using a hydraulic excavator, for example, by swinging the upper boom to the left and right with respect to the lower boom, the arm stays, arms and buckets located on the tip side thereof are moved to the left or right side of the vehicle body. By performing (offset) and operating the lower boom, arm, bucket, etc. at this position, excavation work for the gutter etc. is performed.

Further, for example, in a narrow work site or the like, soil or the like excavated in front of the vehicle body is discharged laterally or rearward. Therefore, the upper revolving superstructure is turned while the front is kept in the in-vehicle turning posture. There is. In this case, the turning posture within the vehicle width is defined as a posture in which the entire front is substantially contained within a virtual circle having a vehicle width as a diameter.

When the front of the hydraulic excavator takes a turning posture in the vehicle width, the operator first offsets the upper boom, the arm stay, the arm and the bucket in the left and right directions, and interferes with the cab within the vehicle width. Move to a position that does not. Next, while rotating the arms and buckets so as to fold them toward the vehicle body side, the boom is largely lifted upwards, whereby the entire front is housed within the imaginary circle, and a turning posture within the vehicle width is obtained. As a result, at the time of the turning operation of the hydraulic excavator, the upper revolving structure and the front can be smoothly turned even at a work site where the vehicle width is narrow, for example.

[0009]

By the way, in the above-mentioned prior art, when performing a turning motion with the front in the vehicle width turning position, the operator must move the arm, the bucket, and the like to the most forwardly projecting part and the vehicle. It is necessary to presumably determine whether or not these are in the in-vehicle turning posture while comparing with a virtual circle imagined by the width and the like.

For this reason, the operator does not carefully operate the front so that the arms and buckets are always in the vehicle-width turning posture while visually confirming the positions of the arms and buckets, and for example, the turning operation is frequently performed. In civil engineering work,
There is a problem that the operability of the front is reduced and it is difficult to perform civil engineering work efficiently.

Particularly, in the offset boom type hydraulic excavator, when the front is in the vehicle width turning posture,
First, it is necessary to position the arms, buckets, etc. within the vehicle width and offset them to positions where they do not interfere with the cab. For this reason, the operator needs to pay attention not only to the front vehicle width turning posture but also to the offset position, which makes it difficult to improve operability in such a case.

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 easily grasp that the front is within the vehicle width and to bring the front into the vehicle width turning posture. An object of the present invention is to provide a hydraulic excavator that can be moved quickly and at the same time has improved operability and can perform civil engineering work smoothly.

[0013]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides an upper portion provided with a lower traveling body and a cab or a canopy rotatably mounted on the lower traveling body and covering an operator's head. It consists of a revolving superstructure and a front provided on the upper revolving superstructure. The front is attached to the upper revolving superstructure so that the lower boom can be moved upward and downward, and the left and right ends of the lower boom are attached to the lower boom. Upper boom mounted so as to be swingable in any direction, an arm stay mounted at the tip side of the upper boom so as to be swingable left or right, and rotatable upward or downward at the tip side of the arm stay The present invention is applied to a hydraulic excavator including an arm attached to the above and a bucket attached to the tip end side of the arm so as to be rotatable upward and downward.

The feature of the constitution adopted by the invention of claim 1 is that the angle at which the front constituted by the lower boom, the upper boom, the arm stay, the arm and the bucket is displaced upward, downward or left or right. An angle sensor for detecting is provided, and the front is in a non-interference area that does not interfere with the cab or the canopy by using a detection signal input from the angle sensor, and the front is within the vehicle width of the lower traveling body. It is configured to provide a vehicle width informing means for informing.

With this configuration, the vehicle width notifying means notifies the operator that the front is in the non-interference area where it does not interfere with the cab or the canopy, and the front is within the vehicle width of the undercarriage. be able to. As a result, the operator can easily grasp the positional relationship between the front and the vehicle width, the cab, etc., and therefore, when performing a turning operation, while checking the operating state of the notification means, the front is lowered and raised at an appropriate offset position. Can be made.

Further, in the invention of claim 2, the front is within the vehicle width of the undercarriage in the non-interference area where the front does not interfere with the cab or the canopy by using the detection signal input from the angle sensor, and It is configured to provide a vehicle-inside turning attitude notifying unit that notifies that the front is in a vehicle-inside turning attitude that fits within a virtual circle corresponding to the vehicle width.

Accordingly, the vehicle width turning posture informing means is
It is possible to notify the operator that the front is in the vehicle width in the non-interference area where it does not interfere with the cab and the front is in the vehicle width turning posture. Therefore, the operator can easily grasp the turning posture in the vehicle width during the operation of the front, and when performing the turning motion, while checking the operating state of the notification means, the front is moved into the virtual circle corresponding to the vehicle width. The vehicle can be swiftly accommodated to have a turning posture within the vehicle width.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings, taking an ultra-small turning type offset boom hydraulic excavator as an example.

Reference numeral 1 is a lower traveling body of the hydraulic excavator, 2 is an upper revolving body mounted on the lower traveling body 1 so as to be rotatable, and a driver's seat 4 to be described later is provided on a revolving frame 3 of the upper revolving body 2. , Canopy 8, building cover 9, counterweight 10
Etc. are provided.

Reference numeral 4 denotes a driver's seat located on the left side of the revolving frame 3 and provided on a floor plate 5 covering the revolving frame 3. The front side of the driver's seat 4 is as shown in FIGS. 1, 5 and 6. ,left,
A lever stand 6 on which a right traveling lever and an operating lever are arranged is projected on the floor plate 5. Further, on the right side of the driver's seat 4, there is provided a control box 7 in which various indicators, operation switches, key cylinders (not shown) for engine keys are arranged.

Reference numeral 8 denotes a canopy which is located on the left side of the front part of the revolving frame 3 and covers the head of an operator seated in the driver's seat 4. The canopy 8 is a pillar 8 as shown in FIGS.
It is erected on the floor plate 5 via A and the like, and has a right side surface portion 8B facing the front 11 side described later.

Reference numeral 9 denotes a building cover which is located on the rear side of the canopy 8 and constitutes the outer shell of the upper revolving structure 2. Inside the building cover 9, various kinds of components including an engine, a hydraulic pump (not shown) and the like are included. The equipment is housed.

Reference numeral 10 is a counterweight provided on the rear end side of the revolving frame 3 for balancing the weight of the front 11, and the counterweight 10 is formed in a substantially arc shape so as to surround the engine and the like from the rear. .

Generally, it is obliged that the upper swing body of a hydraulic excavator of the ultra-small swing type has a swing radius within 1.2 times the vehicle width of the lower traveling body. And
In the present embodiment, the revolving frame 3, the canopy 8, the building cover 9, the counterweight 10, etc. of the upper revolving structure 2 are
As shown in FIG. 5, it is formed in a substantially circular shape so as to fit within a virtual circle C having a turning radius R substantially equal to the vehicle width W of the lower traveling body 1. As a result, the hydraulic excavator according to the present embodiment has the swing center O of the upper swing body 2 when the front 11 is held in the swinging posture within the vehicle width as shown in FIGS. 3 to 5.
It is possible to perform a turning motion within a turning radius R corresponding to the vehicle width W around the (axis O-O).

Reference numeral 11 denotes an offset boom type front, which is located on the right side of the canopy 8 and is provided on the front side of the revolving frame 3 so as to be able to move up and down. The front 11 is, as shown in FIGS. The lower boom 12 whose base end side is attached to the revolving frame 3 so as to be able to move upward and downward, the upper boom 13 which is attached to the tip end side of the lower boom 12 so as to be swingable in the left and right directions, and the upper boom 13 An arm stay 14 attached to the tip side so as to be swingable leftward and rightward
An arm 15 rotatably attached to the arm stay 14 in an upward and downward direction (dump direction, cloud direction);
A bucket 16 is attached to the tip end side of the arm 15 so as to be rotatable in the upward and downward directions (the dump direction and the cloud direction).

Here, the lower boom 12 and the arm stay 1
A link 17 that forms a parallel link together with these and the upper boom 13 is provided between them and the upper boom 13. A boom cylinder 18 is provided between the revolving frame 3 and the lower boom 12, an arm cylinder 19 is provided between the arm stay 14 and the arm 15, and a bucket cylinder is provided between the arm 15 and the bucket 16. A cylinder 20 is provided. Further, an offset cylinder 21 is provided between the lower boom 12 and the upper boom 13.

When the offset cylinder 21 is expanded and contracted, the upper boom 13 swings leftward and rightward on the tip side of the lower boom 12. At this time, the arm stay 14 is swung in the direction opposite to the upper boom 13 by the link 17, and is held in a state parallel to the lower boom 12.

As a result, the front 11 is, for example, as shown in FIG.
Neutral position (offset zero position) M0 indicated by a virtual line in the middle
Is moved (offset) in parallel from left to right or
It is arranged between the left side maximum offset position ML and the right side maximum offset position MR.

In this case, when the front 11 is arranged at the left or right maximum offset position ML, MR, even if the front 11 is rotated at this offset position as shown by a virtual line in FIGS. 4 and 5. , Bucket 16
It is held at a position protruding outside the vehicle width W.

Further, for example, when the bucket 16 and the like are arranged on the left side of an offset range A described later, when the arm 15, the bucket 16 and the like are rotated so as to be folded toward the vehicle body in this state, they interfere with the canopy 8. There is a risk of Therefore, the hydraulic excavator has an angle sensor 2 to be described later.
The position of the bucket 16 is detected by using 3 to 27, and the claws and the like are out of the preset non-interference area and the canopy 8
An interference prevention device (not shown) for forcibly stopping the operation of the front 11 when the vehicle is too close to is installed.

In this case, the non-interference area is a space in which the front 11 can be displaced upward, downward or left or right while ensuring a certain safe distance with respect to each part of the canopy 8. It is defined as an area, and is an area in which there is no risk of the bucket 16 or the like colliding with the canopy 8 even if the front 11 moves.

On the other hand, for example, when the bucket 16 and the like are arranged within the offset range A, as shown by the solid lines in FIGS. 4 and 5, the arm 15, the bucket 16 and the like are rotated so as to be folded toward the vehicle body at this position. Lower boom 12 while moving
When the vehicle is largely swung upwards, the entire front surface 11 can take a turning posture within the vehicle width within the turning radius R (virtual circle C) of the upper-part turning body 2.

Here, the offset range A is, for example, the right end of the vehicle width W of the lower traveling body 1 and the right side surface portion 8B of the canopy 8.
It is defined as a range between and and has a constant width dimension in the left and right directions. Therefore, when the front 11 is within the offset range A, these are located within the vehicle width W of the lower traveling body 1 and are located on the right side of the right side surface portion 8B of the canopy 8.

On the other hand, reference numeral 22 is a controller mounted on the hydraulic excavator, and as shown in FIG. 8, the controller 22 has angle sensors 23, 2 which will be described later and located on the input side thereof.
4, 25, 26 and 27 are connected to the operation switch 29 of the front state display device 28. Further, an in-vehicle width indicator lamp 30 and an in-vehicle width turning attitude indicator lamp 31, which will be described later, are connected to the output side of the controller 22.

Then, when the front 11 operates, when the detection signals are input from the angle sensors 23 to 27 to the controller 22, the controller 22 calculates the position of each part of the front 11 using these detection signals. ,
When the operation switch 29 is set to ON, the indicator lights 30 and 31 are individually operated according to the position of the front 11.

In this case, the controller 22 determines whether or not the front 11 is in the non-interference area where the front 11 does not interfere with the canopy 8 and the front 11 is in the offset range A in the left and right directions. The vehicle-width indicator lamp 30 is turned on and off according to the result. In addition, the controller 22
Determines whether the front 11 is in the offset range A in the non-interference area and the front 11 is in the vehicle-width turning posture that is accommodated within the turning radius R, and the vehicle is determined according to the determination result. The in-width turning attitude indicator lamp 31 is turned on and off.

Reference numerals 23, 24, 25, 26, and 27 denote a plurality of angle sensors provided on the front 11. The angle sensors 23, 24, 25, 26, and 27 include the lower boom 12, the upper boom 13, the arm stays 14, The displacements of the arm 15 and the bucket 16 are individually detected as a depression / elevation angle, a swing angle, or a rotation angle, and a detection signal is output to the controller 22.

Reference numeral 28 denotes a front state display device provided near the driver's seat 4. The front state display device 28 is, for example, as shown in FIGS. It is attached to the pillar 8A of the canopy 8. Then, the front state display device 28
Is composed of an operation switch 29 for switching between its operation and stop, an in-vehicle width indicator lamp 30 and an in-vehicle turning attitude indicator lamp 31, which will be described later.

Reference numeral 30 denotes an in-vehicle width indicator light as an in-vehicle width informing means. In the in-vehicle width indicator light 30, for example, the bucket 16 of the front 11 is in the non-interference area with the canopy 8,
In addition, the front 11 is turned on when the front 11 is in the offset range A, and is turned off when any of these conditions is not satisfied, thereby informing the operator.

Reference numeral 31 denotes an in-vehicle turning attitude display lamp serving as an in-vehicle turning attitude informing means.
Is turned on when the front 11 is in the offset range A in the non-interference area and the front 11 is within the turning radius R, and is turned off when any of these conditions is not satisfied. , To notify the operator.

The hydraulic excavator according to the present embodiment has the above-mentioned structure, and its operation will be described below.

First, when excavating a gutter or the like with a hydraulic excavator, for example, when the offset cylinder 21 is operated, the upper boom 13, the arm stay 14, the arm 15, the bucket 16, etc. of the front 11 are offset to the left or right. By operating the boom cylinder 18, the arm cylinder 19, the bucket cylinder 20 and the like at this position, the lower boom 12, the upper boom 13, the bucket 16 and the like can be displaced to excavate earth and sand.

Also, for example, when the operator needs to perform a turning motion in a turning posture within the vehicle width during excavation work, the operator turns on the operation switch 29 of the front state display device 28 to operate the display device 28. Thus, the front 11 is operated while confirming the display.

Here, referring to FIG. 9, the control process of the front state display device 28 by the controller 22 will be described. First, in step 1, it is determined whether or not the operation switch 29 is ON. In this case, when the engine key is ON, the processes of steps 1 to 11 are repeatedly executed by step 11 described later.

When it is judged "NO" in step 1, the process proceeds to step 11 and the operation switch 29 is turned on.
It will be in a standby state until it becomes N.

If "YES" is determined in step 1, the detection signals input from the angle sensors 23 to 27 are read in step 2, and in step 3, each part of the front 11 (using these detection signals is read. Lower boom 1
2, upper boom 13, arm stay 14, arm 1
5, the position of the bucket 16) is calculated.

Next, in step 4, it is determined whether or not the bucket 16 and the like are in the non-interference area with the canopy 8. When it is determined to be “YES” in step 4, the front 11 is in the non-interference area with respect to the canopy 8, so the operator displaces the front 11 in this area in order to make the in-vehicle turning posture. Even so, it is possible to prevent the bucket 16 and the like from interfering with the canopy 8.

Further, when it is determined to be "NO" in step 4, if the front 11 is displaced carelessly, the bucket 16 and the like may come too close to the canopy 8 and the interference prevention device may operate. In step 7, the vehicle-width indicator lamp 30 is turned off.

Next, in step 5, it is determined whether or not each part of the front 11 is within the vehicle width W. When it is determined to be "YES", for example, in step 6, the vehicle width indicator lamp 30
Is turned on and the operator is notified. Thereby, the operator can easily understand that the front 11 is in the non-interference area and is within the vehicle width W by the indicator light 30, and can confirm that the front 11 is in an appropriate position with respect to these. Therefore, in order to put the front 11 in the vehicle width turning posture at this offset position, the arm 1
5, the lower boom 12 can be largely swung upward while rotating the bucket 16 and the like so as to be folded toward the vehicle body.

Further, when it is determined to be "NO" in step 5, since the bucket 16 and the like are protruding from the vehicle width W to the outside, even if the front 11 is lifted in this state, the vehicle turns inside the vehicle width. I can't take a posture. Therefore, in this case, the process proceeds to step 7 to turn off the vehicle width indicator lamp 30.

Therefore, as shown by the phantom line in FIG. 2, for example, when the bucket 16 is arranged outside the vehicle width W during excavation work, or when the bucket 16 is arranged in front of the canopy 8. In this state, the vehicle width indicator lamp 30 is turned off. As a result, the operator can easily understand that the front 11 cannot take the in-vehicle turning posture at these offset positions.

Next, in step 8, the angle sensors 23-
By using the detection signal from 27, the front 11
Is determined to be within the vehicle width turning posture within the turning radius R, and when it is determined to be "NO", the front 11 is protruding from the turning radius R. The in-width turning posture indicator lamp 31 is turned off.

When it is determined to be "YES" in step 8, the front 11 is almost within the turning radius R by the operation of the operator. Therefore, in step 10, the in-vehicle turning attitude indicator lamp 31 is turned on and the operator A notification operation is performed on the.

At this time, the operator confirms the indicator lamp 31 so that the front 11 is in the non-interference area in step 4, the front 11 is within the vehicle width W in step 5, and the front 11 is in the vehicle width in step 8. It is possible to easily understand that the turning posture is within the width. As a result, the operator can reliably hold the front 11 in the turning posture within the vehicle width, and can safely turn the upper swing body 2 in this state even in a narrow work site or the like.

Next, in step 11, it is determined whether or not the engine key is ON. If "YES" is determined, the process returns to step 1, and if "NO" is determined, the process ends in step 12. .

Thus, according to the present embodiment, the angle sensors 23 to 2 are used to detect the displacement of each part of the front 11.
7 and the front state display device 28 provided with the indicator lights 30 and 31 are provided. Therefore, for example, when performing a turning operation in the vehicle width turning posture during excavation work, the operator is
First, while confirming the display of the vehicle width indicator light 30, by operating the offset cylinder 21, the arm 15, the bucket 16, etc. can be offset to the left or right side to the position where the vehicle width indicator light 30 is turned on, and the front 11 can be placed at an appropriate offset position.

As a result, the operator can move the undercarriage 1
Since the positional relationship of the front 11 with respect to the vehicle width W of the vehicle and the canopy 8 can be easily grasped by the vehicle-width indicator lamp 30,
When the front 11 is raised, the bucket 16 or the like comes too close to the canopy 8 to operate the interference prevention device,
It is possible to prevent the bucket 16 from sticking out of the vehicle width W, and it is possible to smoothly realize the turning posture in the vehicle width.

Then, the operator can easily grasp the positional relationship of the front 11 with respect to the turning radius R by the in-vehicle turning attitude display light 31 when the front 11 is raised while the display light 30 is lit. , This indicator light 31
While confirming the display of, the front 11 can be swiftly set in the vehicle width turning posture.

Therefore, during excavation work, for example, the operability and safety when, for example, the front 11 extended forward is placed in a turning posture in the vehicle width, the operability and safety can be surely improved, and the civil engineering work including the turning operation can be performed. It can run smoothly.

Although the front state display device 28 is provided on the pillar 8A of the canopy 8 in the above-described embodiment, the present invention is not limited to this, and any portion having good visibility from the driver's seat 4 can be used. The front state display device 28 may be arranged in the above.

In this case, the front state display device 28 'may be attached to the control box 7 as in the first modification shown in FIG. Also, FIG.
As in the second modified example shown in FIG. 1, the front state display device 28 ″ may be installed upright on the floor plate 5 by the support bracket 28A ″.

In the embodiment, the notification operation is performed by turning on and off the indicator lights 30 and 31 of the front state display device 28. However, the present invention is not limited to this, and the indicator lights may be blinked, for example. Or its display contents (color,
The notification operation may be performed by changing characters, patterns, etc.). Further, the present invention is not limited to the indicator light, and for example, an alarm sound using a buzzer or the like, a voice guidance using a voice synthesizer, or the like may be used.

Further, in the embodiment, the angle sensors 23-
27 is used to detect the displacement (angle) of the lower boom 12, the upper boom 13, the arm stay 14, the arm 15, and the bucket 16. However, the arm stay 14
Is always held parallel to the lower boom 12 by the link 17 and the like, and its swing angle is substantially equal to the swing angle of the upper boom 13. Therefore, the present invention is not limited to this.
The angle sensor 25 that detects the swing angle of the arm stay 14 may be omitted.

Further, in the embodiment, the ultra-small turning hydraulic excavator provided with the canopy 8 has been described as an example.
The present invention is not limited to this, and may be applied to, for example, a medium-sized or large-sized hydraulic excavator in which a driver's seat is housed in a substantially box-shaped cab.

[0065]

As described in detail above, according to the first aspect of the invention, by using the angle sensor for detecting the displacement of each part of the front, the front is in the non-interference area where it does not interfere with the cab or the canopy, In addition, since the vehicle-width informing means for informing that the front is within the vehicle width is provided, the operator of the hydraulic excavator does not have each part of the front or rear of the cab or canopy when the front is raised. The fact that the vehicle is in the vehicle width in the interference region can be easily grasped by the vehicle width informing means, and the front can be lifted and lowered with an appropriate offset while confirming the operating state of the informing means. Therefore, for example, it is possible to surely improve the operability and safety when the front is in the vehicle width turning posture, and to smoothly perform the civil engineering work.

Further, according to the second aspect of the invention, the vehicle-turning in the vehicle width is informed that the front is in the vehicle width in the non-interference area with the cab or the canopy and the front is in the vehicle-width turning posture. Since it is configured to provide posture notification means,
The operator can easily grasp whether or not each part is in the in-vehicle turning posture when the front is swung up by the in-vehicle turning posture informing means, and while confirming the operating state of the informing means, The front can be swung up quickly to fit within the virtual circle that corresponds to the vehicle width. Therefore, during excavation work, operability and safety when the front is turned in the vehicle width turning posture can be surely improved.

[Brief description of drawings]

FIG. 1 is a front view showing an ultra-small turning hydraulic excavator according to an embodiment of the present invention.

FIG. 2 is a plan view of the hydraulic excavator showing a state in which the front is offset within an offset range in which the front can be in a vehicle width turning posture.

FIG. 3 is a front view of the hydraulic excavator showing a state in which the front is in a vehicle width turning posture.

FIG. 4 is a left side view of FIG. 3 as seen from the front side of the hydraulic excavator.

5 is a plan view showing the hydraulic excavator in FIG. 3. FIG.

FIG. 6 is a partially enlarged perspective view near a driver's seat showing a front state display device.

FIG. 7 is a front view showing an enlarged front state display device.

FIG. 8 is a configuration diagram showing a controller, an angle sensor, and a front state display device mounted on the hydraulic excavator.

FIG. 9 is a flowchart showing a control process of the front state display device by the controller.

10 is a partially enlarged perspective view of the front state display device of the hydraulic excavator according to the first modified example of the present invention, viewed from the same position as in FIG.

11 is a partially enlarged perspective view of a front state display device for a hydraulic excavator according to a second modified example of the present invention, viewed from the same position as in FIG.

[Explanation of symbols]

1 Lower Traveling Body 2 Upper Revolving Body 3 Revolving Frame 4 Driver's Seat 5 Floor Board 7 Control Box 8 Canopy 8A Pillar 10 Counterweight 11 Front 12 Lower Boom 13 Upper Boom 14 Armstay 15 Arm 16 Bucket 17 Link 18, 19, 20, 21 Cylinder 22 Controllers 23, 24, 25, 26, 27 Angle sensor 28 Front state display device 29 Actuation switch 30 Vehicle width indicator light (vehicle width indicating means) 31 Vehicle width turning attitude indicator light (vehicle width turning attitude notification means) C virtual circle W width

Continued front page    F-term (reference) 2D003 AA01 AB03 AB04 AC09 BA07                       BB11 CA02 DA04 DB04 DC01                       FA02                 2D015 GA03 GB01 GB06 GB07 HA03

Claims (2)

[Claims] 1. An undercarriage, an upper revolving structure which is rotatably mounted on the lower traveling structure and which is provided with a cab or a canopy for covering an operator's head, and a front provided on the upper revolving structure. , The front is mounted on the upper revolving superstructure so that the lower boom can be moved up and down, the upper boom mounted on the tip side of the lower boom so as to be swingable in the left and right directions, and the tip of the upper boom. On the side, an arm stay attached to the left and right so as to be swingable, an arm attached to the tip side of the arm stay so as to be able to rotate upward and downward, and an upper and a lower end on the tip side of the arm stay. In a hydraulic excavator including a bucket mounted so as to be rotatable in any direction, the front configured by the lower boom, the upper boom, the arm stay, the arm, and the bucket is moved upward or downward. Is provided with an angle sensor for detecting an angle when the vehicle is displaced in the left and right directions, and the front is in a non-interference area where the front side does not interfere with the cab or the canopy by using a detection signal input from the angle sensor, and the front A hydraulic excavator characterized by being provided with an in-vehicle width notifying means for notifying that the vehicle is within the vehicle width of the lower traveling body. 2. The front is within the vehicle width of the undercarriage in a non-interference area where the front does not interfere with the cab or the canopy by using a detection signal input from the angle sensor,
The hydraulic excavator according to claim 1, further comprising vehicle-in-vehicle turning attitude reporting means for reporting that the front is in a vehicle-inside turning attitude that fits within a virtual circle corresponding to the vehicle width.