JPH1081267A - Crawler type construction vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To keep a car body horizontal even on a slope. SOLUTION: Right and left crawler traveling devices 2 of a car body 1 are each provided with a horizontal frame 3 for supporting the car body 1, an inclination adjusting frame 4 arranged in parallel with the horizontal frame 3, hydraulic cylinders 5 installed between respective frames 3, 4 and for making the horizontal frame 3 horizontal by being extended and contracted according to the inclination of the ground surface, and a crawler 9 wrapped on a plurality of rollers 6 attached to respective frames 3, 4. A crawler stretching means 10 attached to the inclination adjusting frame 4, for applying tension to the crawler 9, and to be extended and contracted according to the extension of the hydraulic cylinders 5 is provided. The hydraulic cylinders 5 may be installed between crawler frames on which right and left crawler traveling devices 2 are attached and the horizontal frame for supporting the car body 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crawler type construction vehicle. More specifically, the present invention relates to an improvement in vehicle body posture control at the time of work on a slope of a construction vehicle that performs work in which the vehicle body posture affects workability and safety, such as crane work and pile driving work.

[0002]

2. Description of the Related Art There is a crawler type mobile crane equipped with a crawler (crawler) traveling device instead of wheels. Since the crawler traveling device has a larger contact area than the wheels, the contact pressure is reduced. For this reason, the crawler type crane vehicle can travel on uneven terrain such as soft ground. Also, since the weight of the crawler is larger than the weight of the wheels, the center of gravity of the crawler type crane vehicle can be lowered.

[0003]

However, even a crawler-type crane vehicle whose center of gravity can be lowered is not suitable for work involving turning of a boom on an inclined ground or the like because the vehicle body is inclined on an inclined ground or soft ground. Was. In this case, if it is a gentle slope, it is possible to carry out the crane work with the car body horizontal by inserting an iron sheet or wood under the crawler, but on the other hand, always keep the iron sheet or wood etc. The user has to carry the device and requires extra preparation work, which complicates the work and increases the cost. Further, since the crawler is merely placed on the iron plate, wood, or the like, the crane operation could not be performed as on the horizontal ground. These problems are not unique to crane vehicles, but are also common to other crawler type construction vehicles such as earth augers.

[0004] It is an object of the present invention to provide a crawler-type construction vehicle capable of maintaining a vehicle body level even on a slope or the like.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, according to the first aspect of the present invention, there is provided a crawler-type construction vehicle having crawler traveling devices on the left and right sides of a vehicle body, wherein each crawler traveling device is a horizontal supporting device for supporting the vehicle body. A frame, a tilt angle adjustment frame arranged side by side with the horizontal frame, and a tilt angle adjustment that is installed between the horizontal frame and the tilt angle adjustment frame and expands and contracts according to the inclination of the ground to level the horizontal frame. And a crawler wound around a plurality of rollers attached to at least the inclination angle adjusting means of the horizontal frame and the inclination angle adjusting frame.

Therefore, when the tilt angle adjusting means is extended, the interval between the horizontal frame and the tilt angle adjusting frame is widened. On the other hand, when the inclination angle adjusting means is contracted, the interval between the horizontal frame and the inclination angle adjustment frame is reduced. Since the inclination angle adjusting means expands and contracts according to the inclination of the ground, the inclination angle adjusting means extends at a position on the lower side to lift the horizontal frame. Therefore, the horizontal frame supporting the vehicle body becomes horizontal. Further, the inclination angle adjusting frame is inclined along the ground, and the crawler is grounded over a wide area.

According to a second aspect of the present invention, there is provided a crawler type construction vehicle which is mounted on one of a horizontal frame and an inclination angle adjusting frame to apply tension to the crawler, and expands and contracts in accordance with extension of the inclination angle adjusting means. It has a tensioning means. Therefore, when the distance between the horizontal frame and the tilt angle adjustment frame changes, the length originally required as a crawler also changes, but the crawler tensioning means expands and contracts and always tensions the crawler with a constant tension.

Further, according to the present invention, there is provided a crawler type construction vehicle having crawler traveling devices on the left and right sides of a vehicle body, a crawler frame to which each crawler traveling device is attached, a horizontal frame supporting the vehicle body, and a crawler frame. And a horizontal frame, and is provided with a tilt angle adjusting unit that expands and contracts according to the inclination of the ground and maintains the horizontal frame horizontally.

Therefore, when the inclination angle adjusting means is extended, the distance between the horizontal frame and the crawler frame is increased. On the other hand, when the inclination angle adjusting means is contracted, the distance between the horizontal frame and the crawler frame is reduced. Since the inclination angle adjusting means expands and contracts in accordance with the inclination of the ground, the inclination angle adjusting means extends at the lower position, and the horizontal frame is lifted. Therefore, the horizontal frame supporting the vehicle body becomes horizontal. Also, the crawler frame is inclined along the ground,
Install the crawler in a large area.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be described below in detail based on the best mode shown in the drawings.

FIG. 1 shows a first embodiment of a crawler type construction vehicle to which the present invention is applied. A crawler traveling device 2 provided on the lower left and right sides of a body 1 of a crawler type construction vehicle, for example, a crane vehicle, includes a horizontal frame 3 and a tilt angle adjustment frame 4, and these frames 3, 4
The inclination angle adjusting means 5 is arranged between the frames,
4, a plurality of rollers 6 and sprockets 7,
A crawler 9 is wound around 8.

The horizontal frame 3 is fixed to a cross member 1a (FIG. 3) constituting a frame of the vehicle body 1. That is, the horizontal frame 3 supports the vehicle body 1. Also,
The tilt angle adjustment frame 4 is arranged alongside the horizontal frame 3, and more specifically, is disposed below the horizontal frame 3.

The tilt angle adjusting means 5 is, for example, a pair of front and rear hydraulic cylinders, and connects the front and rear ends of each of the frames 3 and 4. That is, each hydraulic cylinder 5 is attached to the front and rear ends of the horizontal frame 3, and the respective operating rods are attached to the front and rear ends of the tilt angle adjustment frame 4.
Each hydraulic cylinder 5 is independently operated by a hydraulic circuit described later. Each hydraulic cylinder 5 is, for example, a single-acting cylinder. The hydraulic cylinder 5 extends the operating rod by the transmitted hydraulic pressure, and contracts the operating rod while releasing the hydraulic pressure by the weight of the vehicle body 1.

The crawler tensioning means 10 for applying tension to the crawler 9 is attached to the inclination angle adjusting frame 4. The crawler tensioning means 10 includes, for example, a hydraulic cylinder 11 attached to the inclination angle adjusting frame 4 and a pair of support rollers 12 pressed against the inner surface of the crawler 9 by the hydraulic cylinder 11. The hydraulic cylinder 11 expands and contracts according to the expansion and contraction of the hydraulic cylinder 5, in other words, changes in the interval between the horizontal frame 3 and the tilt angle adjustment frame 4, and prevents the crawler 9 that does not expand and contract from loosening or tension cutting.

FIG. 2 shows an example of a hydraulic circuit for operating each of the hydraulic cylinders 5 and 11. The crane truck has a pair of left and right crawler traveling devices 2, and the inclination angle adjusting means 5 of each crawler traveling device 2 has a pair of front and rear hydraulic cylinders 5. Although the hydraulic cylinder 5 is provided, only one hydraulic cylinder 5 is shown and other hydraulic cylinders 5 are omitted. Similarly, although there are two hydraulic cylinders 11 of the crawler tensioning means 10 as a whole of the crane truck, only one hydraulic cylinder 11 is shown and the other hydraulic cylinder 11 is not shown.

A hydraulic pump 14 driven by an engine 13 of a crane truck supplies oil in a tank 15 to a two-position switching valve 16. The oil supplied from the hydraulic pump 14 is returned to the tank 15 when the two-position switching valve 16 is switched to the position 16A. Therefore, in this state, the operating pressure is not transmitted to each crawler traveling device 2. On the other hand, the two-position switching valve 16
6B, the oil supplied from the hydraulic pump 14 is supplied to the three-position switching valve 17 for operating the hydraulic cylinder 5 of each crawler traveling device 2 and the three-position switching valve 17 for operating the hydraulic cylinder 11 of the crawler tensioning means 10. It is supplied to the switching valve 18.

The three-position switching valve 17 is provided for each hydraulic cylinder 5. When the three-position switching valve 17 is switched to the position 17A, the inside of the hydraulic cylinder 5 is opened to the tank 15 side. Therefore, the operating rod 5a is retracted due to the weight of the vehicle body 1 and the like, and the interval between the horizontal frame 3 and the tilt angle adjusting frame 4 is reduced. On the other hand, when the three-position switching valve 17 is switched to the position 17B, the oil supplied from the hydraulic pump 14 is guided to the hydraulic cylinder 5. Therefore, in this state, the hydraulic cylinder 5
Actuating rod 5a extends to widen the interval between the inclination angle adjusting frame 4 and the horizontal frame 3. Also, a three-position switching valve 1
When the position 7 is switched to the position 17C, the inside of the hydraulic cylinder 5 is closed. Therefore, in this state, the hydraulic cylinder 5 is hydraulically locked to fix the operating rod 5a at its length (position), and the interval between the horizontal frame 3 and the tilt angle adjusting frame 4 is kept constant.

Similarly, when the three-position switching valve 18 for operating the hydraulic cylinder 11 of the crawler tensioning means 10 is switched to the position 18A, the tank 1
Opened to the 5 side. Therefore, the operating rod 11a is retracted due to the tension of the crawler 9 or the like, thereby preventing the crawler 9 from being stretched and cut. On the other hand, when the three-position switching valve 18 is switched to the position 18B, the oil supplied from the hydraulic pump 14 is guided into the hydraulic cylinder 11. Therefore,
In this state, the operating rod 11a of the hydraulic cylinder 11 is extended to prevent the crawler 9 from becoming loose. Further, when the three-position switching valve 18 is switched to the position 18C, the inside of the hydraulic cylinder 11 is closed. Therefore, in this state, the hydraulic cylinder 11 is hydraulically locked, and the operating rod 11a is fixed at its length (position), and the tension of the crawler 9 is kept constant.

Each of the switching valves 16 to 18 is automatically switched by a controller 19 comprising, for example, a microcomputer. The input device of the controller 19 includes a front-rear inclination sensor 20 for detecting the inclination of the vehicle body 1 in the front-rear direction, a left-right inclination sensor 21 for detecting the inclination of the vehicle body 1 in the width direction, a vehicle speed sensor 22 for detecting the traveling speed of the vehicle, An operation switch 23 installed in the driver's seat for operating the start of horizontal adjustment, and an initial position switch (hereinafter referred to as an IP switch) for detecting a state in which the horizontal frame 3 is not lifted with respect to the tilt angle adjustment frame 4 24) are electrically connected. The controller 19 automatically switches each of the switching valves 16 to 18 based on signals supplied from these sensors. The output device of the controller 19 includes a horizontal frame 3
An indicator light 25 for warning a driver or the like of the rise of the vehicle is electrically connected. The indicator light 25 is installed on the control panel of the driver's seat.

When a crane operation is performed on an uphill, the controller 19 controls the rear hydraulic cylinders 5 (hereinafter, hydraulic cylinders RR (rear cylinders)) of the left and right crawler traveling devices 2.
Right) and RL (Rear Left). ). That is, when the driver of the crane vehicle stops the crane vehicle on an uphill and turns on the operation switch 23, the controller 19 confirms that the vehicle is completely stopped based on a signal from the vehicle speed sensor 22. Thereafter, the two-position switching valve 16 is switched from the position 16A to the position 16B, and the three-position switching valves 17 (hereinafter, referred to as three-position switching valves RR, RL) for operating the hydraulic cylinders RR, RL are switched to the position 17B. Therefore, each hydraulic cylinder R
The operating rods 5a of R and RL begin to extend. On the other hand, the hydraulic cylinders 5 (hereinafter, hydraulic cylinders FR (front right), FL (front
Left). ) Are not operated by the controller 19. Each of the three-position switching valves 17 (hereinafter, three-position switching valves FR and FL) is operated. Therefore, the operating rods 5a of the hydraulic cylinders FR and FL are kept in the retracted state by the vehicle weight. Therefore, each horizontal frame 3
Of the rear hydraulic cylinders FR, FL starts to rise with the fulcrum as a fulcrum. The controller 19 operates the three-position switching valves RR and RL while monitoring the inclination of each horizontal frame 3 with reference to the output signals of the front and rear inclination sensor 20 and the left and right inclination sensor 21 at predetermined time intervals. When the rear end of the frame 3 rises, the IP switch 24 is turned off. Controller 1 that detects that IP switch 24 is off
9 turns on the indicator light 25. The driver can see the indicator light 25
The fact that the horizontal adjustment has actually started can be confirmed by the lighting of.

When the controller 19 detects the horizontal state of each horizontal frame 3 based on the signals from the front and rear inclination sensors 20 and the left and right inclination sensors 21, the controller 19 determines the positions of the three-position switching valves RR and RL. 17C
And the hydraulic cylinders RR and RL are hydraulically locked. Thereby, each horizontal frame 3 is fixed in a horizontal state, and the crane operation can be performed with the vehicle body 1 being horizontal. That is, each of the hydraulic cylinders RR and RL expands and contracts according to the inclination of the ground, and makes each horizontal frame 3, that is, the vehicle body 1 horizontal.

The contact surface of the crawler 9 is significantly wider than the wheels. Therefore, when the crane truck having the traveling device of the wheel performs the crane operation by projecting the outrigger, or even in the case of the crane truck having the crawler traveling device 2, the work is performed by inserting the iron sheet or the wood under the crawler 9. Stable work can be performed as compared with the case where the work is performed.

When the crane operation is completed and the driver turns off the operation switch 23, the controller 19 switches the positions of the three-position switching valves RR and RL to 17A and switches the position of the two-position switching valve 16 to 16A. . When the three-position switching valves RR and RL are switched to the position 17A, the pressure in the hydraulic cylinders RR and RL is released, and the rear ends of the lifted horizontal frames 3 start to descend due to the vehicle weight. Further, the operating pressure generated by the hydraulic pump 14 when the two-position switching valve 16 is switched to the 16A position is released to the tank 15 without being supplied to each crawler traveling device 2.

When each horizontal frame 3 is completely lowered and returns to the initial position, the IP switch 24 outputs an ON signal, whereby the controller 19 causes the indicator lamp 2
5 is turned off. After confirming that the indicator light 25 is turned off, the driver starts the crane truck.

Similarly, when a crane operation is performed on a downhill, the controller 19 extends the front hydraulic cylinders FR and FL of the left and right crawler traveling devices 2. That is, the controller 19 operates the hydraulic cylinders RR and RL when performing a crane operation on an uphill, but when performing a crane operation on a downhill, the controller 19 controls the hydraulic cylinders FR. , FL.

On the other hand, when a crane operation is performed in a state where the vehicle body 1 is tilted left and right, the controller 19 extends the hydraulic cylinders 5 before and after the lower crawler traveling device 2. For example, as shown in FIG. 3, when the right crawler traveling device 2 is low, the controller 19 operates the hydraulic cylinders FR and RR in front and behind the right crawler traveling device 2.

Further, when the vehicle body 1 is inclined in the front-rear direction and the vehicle width direction, in other words, when the vehicle body 1 is inclined in a direction other than the vehicle front-rear direction or the vehicle width direction, the four hydraulic cylinders FR, RR, Horizontal adjustment is performed by appropriately combining FL and RL.

The crawler tensioning means 10 is not always necessary and can be omitted. However, when the crawler tensioning means 10 is omitted, the crawler 9 needs to be in a tensioned state at least when the crane truck travels. For example, when the crane truck travels, all the hydraulic cylinders FR, RR, FL, and RL of each crawler traveling device 2 are extended to make the crawler 9 in a tensioned state. A configuration in which the horizontal frame 3 is adjusted horizontally by contraction can be considered.
When there is a possibility that the crawler 9 which has become loose due to the contraction of the hydraulic cylinder 5 may come off from the driving sprocket 8 or the like, it is desirable to provide a guide for preventing the crawler 9 from coming off.

The case where the crawler tensioning means 10 is attached to the inclination angle adjusting frame 4 has been described.
Of course, the crawler tensioning means 10 may be attached to the horizontal frame 3.

Further, for each crawler traveling device 2,
Although the case where two hydraulic cylinders are provided as the tilt angle adjusting means 5 has been described, the tilt angle adjusting means 5 is not necessarily required.
Need not be installed two by two, and the tilt angle adjusting frame 5 may be installed one by one or three or more. For example,
In the case where one inclination angle adjusting frame driving device 5 is installed for one crawler traveling device 2, the ends of the horizontal frame 3 and the inclination angle adjusting frame 4 may be connected by a fulcrum 26 as shown in FIG. . Similarly, the case where each crawler traveling device 2 is provided with one crawler tensioning unit 10 has been described, but it is needless to say that a plurality of crawler tensioning units 10 may be provided.

In the above-described crane truck, the crawler 9 is wound around both the horizontal frame 3 and the tilt angle adjusting frame 4. However, the crawler 9 may be wound only around the tilt angle adjusting frame 4. That is, in the above-mentioned crane truck,
A plurality of rollers 6 and respective sprockets 7 and 8 are attached to each frame 3 and 4, and a crawler 9 is wound around these. As shown in FIGS. 5 and 6, a plurality of rollers 6 and respective sprockets 7 and 8 are used. May be attached to the inclination angle adjusting frame 4 and the crawler 9 may be wound therearound. In such a structure, the operation of the inclination angle adjusting means 5 does not affect the tension of the crawler 9 and the crawler tensioning means 10
Installation can be omitted.

Next, a second embodiment of a crawler type construction vehicle according to the present invention will be described with reference to FIG. Note that the same members as those of the crane truck in FIG. 1 are denoted by the same reference numerals, and detailed description thereof will be omitted.

A crawler type construction vehicle, for example, a crane truck, has a crawler frame 31 to which the left and right crawler traveling devices 2 are attached, and a horizontal frame 32 for supporting the vehicle body 1.
And an inclination angle adjusting means 5 installed between these frames 31 and 32 to expand and contract in accordance with the inclination of the ground and maintain the attitude of the horizontal frame 32 horizontally. The horizontal frame 32 is supported on the crawler frame 31 by a spherical bearing mechanism 33, and the vehicle body 1 is
7 supported by the horizontal frame 32. In addition,
The tilt angle adjusting means 5 is, for example, a hydraulic single-acting cylinder, and is installed at four positions in front, rear, left and right of the crane truck as shown in FIG. Each hydraulic cylinder 5 is operated independently of each other by a hydraulic circuit, similarly to the crane truck shown in FIG.

FIG. 9 shows a schematic configuration of the spherical bearing mechanism 33. The inner race 34 accommodated in the casing 36 is fixed to the crawler frame 31, and the outer race 35 is fixed to the horizontal frame 32. Each race 34,3
Reference numeral 5 denotes a so-called spherical band shape obtained by cutting a spherical surface into a ring shape, and the horizontal frame 32 is formed with respect to the crawler frame 31, in other words, the crawler frame 31 is formed with respect to the horizontal frame 32 over a range of a predetermined angle over the entire circumference. Can be inclined within. A hole 32 a is formed at a position above the spherical bearing mechanism 33 of the horizontal frame 32. The inner race 34 and the horizontal frame 32 when the crawler frame 31 is inclined with respect to the horizontal frame 32 are formed.
And avoid interference.

The turning bearing mechanism 37 turns the vehicle body 1 with respect to the horizontal frame 32. This swivel bearing mechanism 37 has the same structure as a conventional crane truck, and its configuration is well known. Therefore, in this specification, the swing bearing mechanism 37 is used.
The description of is omitted.

In the crane truck constructed as described above, when each hydraulic cylinder 5 is operated on the slope, the horizontal frame 32 is lifted so as to be horizontal with respect to the crawler frame 31. That is, in the crane truck of FIG.
While the posture control is performed in each crawler traveling device 2, the posture control is performed between each crawler traveling device 2 and the vehicle body 1 in the crane vehicle in FIG. 7. However, by operating each hydraulic cylinder 5 independently, the vehicle body 1 can be leveled even if the ground is inclined in any direction.
It is similar to the crane truck in FIG. The hydraulic cylinder 5
Of course, the number of installations may be changed.

The above embodiments are examples of preferred embodiments of the present invention, but are not limited thereto, and various modifications can be made without departing from the spirit of the present invention. For example, the case where a hydraulic cylinder is used as the tilt angle adjusting means 5 has been described. However, any mechanism that can adjust the interval between the frames 3, 4 or 31, 32 by expanding and contracting is limited to the hydraulic cylinder 5. is not.

Although the case where a single-acting cylinder is used as the hydraulic cylinder 5 has been described, it goes without saying that a double-acting cylinder may be used.

When the controller 19 operates the tilt angle adjusting means 5, the horizontal frame 3 or the horizontal frame 3 is controlled.
Although the case where the horizontal adjustment of the horizontal frame 2 is automatically performed has been described, the horizontal adjustment of the horizontal frame 3 or the horizontal frame 32 may be performed while the driver manually operates each inclination angle adjusting unit 5.

Further, in each embodiment, the case where the present invention is applied to a crawler type mobile crane is described. However, the present invention is not limited to this.
Also, it is needless to say that the present invention may be applied to a crawler type construction vehicle other than the crawler type crane vehicle, for example, a crawler type earth auger.

[0041]

As described above, in the crawler type construction vehicle according to the first aspect, each crawler traveling device includes a horizontal frame that supports a vehicle body, and a tilt angle adjustment frame that is arranged alongside the horizontal frame. A tilt angle adjusting means installed between the horizontal frame and the tilt angle adjusting frame to expand and contract according to the inclination of the ground to level the horizontal frame, and at least the tilt angle adjusting frame of the horizontal frame and the tilt angle adjusting frame And a crawler wound around a plurality of rollers attached to the vehicle. For this reason, a crane operation, a pile driving operation, and the like can be performed in a state where the vehicle body is maintained horizontal on an inclined ground, and a more stable operation can be performed. In addition, the iron plate, etc., which was required in the conventional construction vehicle, becomes unnecessary, and the complicated work for inserting the iron sheet, etc. under the crawler is not required, thereby improving workability. At the same time, cost can be reduced.

The crawler-type construction vehicle according to claim 2, which is attached to one of the horizontal frame and the tilt angle adjusting frame, applies tension to the crawler, and expands and contracts in accordance with extension of the tilt angle adjusting means. Since the tensioning means is provided, the crawler can always be tensioned with a constant tension even when the horizontal frame is adjusted horizontally, so that the crawler can be prevented from being loosened and stretched.

Further, the crawler type construction vehicle according to the third aspect is provided with a crawler frame to which each crawler traveling device is attached, a horizontal frame supporting the vehicle body, and a crawler frame and the horizontal frame, and Since the vehicle is provided with the inclination angle adjusting means which expands and contracts in accordance with the inclination to maintain the horizontal frame horizontally, the inclination of the vehicle body can be prevented even on a sloped land, similarly to the crawler type construction vehicle of the first aspect. In addition, work can be performed in a more stable state, workability can be improved, and cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a side view showing a first embodiment of a crawler type mobile crane according to the present invention, in a state where horizontal adjustment is performed on an uphill.

FIG. 2 is a diagram showing a hydraulic circuit for operating each hydraulic cylinder of the crawler type mobile crane of FIG.

FIG. 3 is a front view showing a state in which the crawler type mobile crane shown in FIG. 1 has been horizontally adjusted on a slope in a vehicle width direction.

FIG. 4 is a schematic configuration diagram showing another embodiment of the crawler traveling device of the crawler type crane vehicle of FIG.

FIG. 5 is a side view showing another embodiment of the crawler type mobile crane of FIG. 1;

FIG. 6 is a partially enlarged view of the crawler type mobile crane shown in FIG. 5;

FIG. 7 is a front view showing a second embodiment of a crawler type mobile crane according to the present invention.

8 is a view showing the arrangement of each inclination angle adjusting means of the crawler type mobile crane of FIG. 7;

9 is a sectional view showing an example of a spherical bearing mechanism of the crawler type mobile crane of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Body 2 Crawler traveling device 3, 32 Horizontal frame 4 Inclination angle adjustment frame 5 Hydraulic cylinder (inclination angle adjustment means) 6 Roller 9 Crawler 10 Crawler tensioning means 31 Crawler frame

Claims (3)

[Claims] 1. A crawler-type construction vehicle having crawler traveling devices on the left and right sides of a vehicle body, wherein each of the crawler traveling devices includes a horizontal frame that supports the vehicle body, and an inclination angle adjustment frame that is arranged alongside the horizontal frame. A tilt angle adjusting unit installed between the horizontal frame and the tilt angle adjusting frame, which expands and contracts according to the inclination of the ground to level the horizontal frame; and at least the tilt angle of the horizontal frame and the tilt angle adjusting frame. A crawler-type construction vehicle, comprising: a crawler wound around a plurality of rollers attached to an adjustment frame. 2. A crawler tensioning means which is attached to one of the horizontal frame and the tilt angle adjusting frame to apply tension to the crawler, and expands and contracts in accordance with extension of the tilt angle adjusting means. Claim 1
A crawler-type construction vehicle as described. 3. A crawler type construction vehicle having crawler traveling devices on left and right sides of a vehicle body, a crawler frame to which each of the crawler traveling devices is attached, a horizontal frame supporting the vehicle body, and a crawler frame and a horizontal frame. A crawler-type construction vehicle, comprising: a tilt angle adjusting means installed between the two and extending and contracting according to the inclination of the ground to maintain the horizontal frame horizontal.