JP7087651B2 - Running body of construction machinery - Google Patents

Description

The present invention relates to a traveling body of a construction machine.

For example, as a construction machine such as a crane, a hydraulic excavator, or a pile driver, a traveling body having a traveling means having a pair of crawler and an upper portion provided on the traveling body so as to be able to turn horizontally and a boom can be mounted up and down. Those equipped with a swivel body are known.

In a construction machine equipped with such a crawler, it is preferable that the distance between the pair of crawlers is wide in order to ensure the stability during the work. On the other hand, since the construction machine equipped with crawlers is loaded on a trailer or the like and transported, it is preferable that the distance between the pair of crawlers is narrow during transportation. In order to satisfy such conflicting requirements, a traveling body provided with a scaling device for expanding or contracting the distance between a pair of crawlers having each crawler is known (see JP-A-2003-137145).

In this traveling body, the adapter body is connected to the tip of the axle that is bridged between the crawler frames of the pair of crawler units to extend the axle, and the expansion / contraction device is used to widen the distance between the pair of crawler units. It is configured to be able to. On the other hand, in the above-mentioned conventional traveling body, the space between the pair of crawler units is shortened during transportation, and the vehicle width is reduced by removing the adapter main body. However, the adapter body is heavy, and a heavy machine such as a crane is required to attach / detach each time, and the attachment / detachment work requires time and effort.

As a traveling body that improves the efficiency of this attachment / detachment work, a traveling body having an extended arm configured to be rotatable 90 ° at the tip of the axle has been proposed (see JP-A-2000-142497). In this traveling body, by configuring the extension arm to be rotatable, the extension arm can be folded during transportation and the vehicle width can be reduced, so that the attachment / detachment work can be eliminated. Since this extended arm is configured to be rotatable, its width is smaller than that of the axle body. Therefore, if the work is performed in the enlarged state, the crawler unit tends to swing left and right, which may hinder the running. In order to avoid this, the conventional traveling body is provided with a stopper arm to prevent the crawler unit from easily swinging to the left or right when the crawler unit is expanded.

In the conventional traveling body provided with the extended arm, the stopper arm increases the weight and manufacturing cost of the traveling body, and new work for setting or releasing the stopper arm is required. Further, the stopper arm is set after the crawler unit is in the enlarged state. Therefore, when the crawler unit is moved from the reduced state to the enlarged state, this stop arm does not work, and the crawler unit tends to swing left and right. The left and right runout during movement of the crawler unit may cause damage such as deformation or breakage to the through hole of the crawler frame through which the axle penetrates.

Japanese Patent Application Laid-Open No. 2003-137145 Japanese Unexamined Patent Publication No. 2000-142497

The present invention has been made based on the above-mentioned circumstances, and the running of a construction machine capable of easily expanding or contracting the interval between crawler units, hardly damaging the crawler frame, and reducing the weight and manufacturing cost. The challenge is to provide the body.

The invention made to solve the above problems includes a crawler frame having through holes at two locations in the front-rear direction in the traveling direction and a crawler arranged in the crawler frame, and a pair arranged apart from each other in the vehicle width direction. Between the crawler unit, the front axle spanning between the through holes in the front part of each crawler frame of the pair of crawler units in the traveling direction, and the through holes in the rear part of each crawler frame of the pair of crawler units in the traveling direction. A traveling body of a construction machine including a rear axle that is bridged and a scaling device that moves the crawler frame in the vehicle width direction so as to expand or contract the distance between the pair of crawler units. In a reduced state in which the distance between the front axle body and the pair of crawler units is reduced in the vehicle width direction at both ends of the front axle body, the crawler frame protrudes outward in the vehicle width direction and rotates from the vehicle width direction to the traveling direction. It has a pair of movable front extension portions and a front mounting member that can be attached to and detached from the front extension portion, and the rear axle has a rear axle main body and a pair of crawler at both ends of the rear axle main body. A pair of rear extension parts that project outward in the vehicle width direction of the crawler frame and can rotate from the vehicle width direction to the traveling direction in a reduced state in which the distance between the units is reduced in the vehicle width direction, and can be attached to and detached from the rear extension portion. The front mounting member and the rear mounting member have the front extension and the rear extension in an expanded state in which the distance between the pair of crawler units is widened in the vehicle width direction. Each is configured to be fixed in the vehicle width direction, the front extension portion has a lower contact surface that abuts on the lower surface of the through hole in the front portion in the traveling direction, and the rear extension portion is the rear portion in the traveling direction. The front mounting member has a lower contact surface that abuts on the lower surface of the through hole, and the front mounting member has a front contact surface that abuts on the front surface of the through hole in the traveling direction in the traveling direction. The rear portion of the through hole in the traveling direction has a rear contact surface that abuts on the rear surface in the traveling direction.

Since the traveling body of the construction machine is configured such that the front extension portion of the front axle and the rear extension portion of the rear axle are rotatable from the vehicle width direction to the traveling direction, the directions of these extension portions are rotated. By doing so, the distance between the crawler units can be easily expanded or contracted without the work of attaching and detaching the extension portion.

Further, the traveling body of the construction machine has a front mounting member and a rear mounting member for fixing the front extension portion and the rear extension portion in the vehicle width direction, respectively, and the front mounting member is the through hole. The rear mounting member has a front contact surface that abuts on the front surface in the traveling direction, and the rear mounting member has a rear contact surface that abuts on the rear surface in the traveling direction of the through hole. Before moving the crawler unit from the reduced state to the expanded state, the traveling body of the construction machine is equipped with these mounting members and maintains the mounting even in the expanded state. Therefore, in the traveling body of the construction machine, when the crawler unit is moved from the reduced state to the expanded state and in the expanded state, the front contact surface of the front mounting member hits the side surface of the through hole of the crawler unit. The rear contact surface of the rear mounting member comes into contact with the side surface of the through hole of the crawler unit to prevent the crawler unit from swinging to the left or right. Therefore, the traveling body of the construction machine is less likely to damage the crawler frame.

Further, since the traveling body of the construction machine does not require a new stopper arm or the like for stabilizing the posture of the crawler unit by having these mounting members, the weight and the manufacturing cost can be reduced.

The front extension portion has a notch in the upper portion on the front axle body side to which the front mounting member can be fitted, and the front mounting member is fitted with the notch of the front extension portion. The rear extension portion has a contact surface in contact with the front axle body, and the rear extension portion has a notch in the upper portion on the rear axle body side into which the rear mounting member can be fitted. It is preferable to have a contact surface that comes into contact with the rear axle body in a state of being fitted to the notch of the rear extension portion. In this way, the front mounting member has a contact surface that comes into contact with the front axle body in a state of being fitted to the notch of the front extension portion, and the rear mounting member is cut of the rear extension portion. By having a contact surface that comes into contact with the rear axle body in the fitted state with the notch, it is possible to prevent the front extension portion and the rear extension portion from rotating. Further, since the notch is provided at the upper part, it can be fixed only by fitting the front mounting member and the rear mounting member, and for example, since a fixing member such as a screw is not required, the weight and the manufacturing cost can be reduced. Further, since the front mounting member is fitted to the front axle main body side and the rear mounting member is fitted to the rear axle main body side, when moving the crawler unit from the reduced state to the expanded state, from the beginning. The front contact surface of the front mounting member and the rear contact surface of the rear mounting member come into contact with the side surface of the through hole of the crawler unit, and the crawler unit can be more effectively prevented from swinging to the left or right.

The front mounting member has both a front contact surface that abuts on the front surface of the through hole in the traveling direction in the traveling direction and a rear contact surface that abuts on the rear surface in the traveling direction of the through hole, and also has the front contact surface. Is in contact with the front surface of the through hole, and the rear contact surface is in contact with the rear surface of the through hole. The rear mounting member is provided with a mechanism, and has both a front contact surface that abuts on the front surface of the through hole in the traveling direction and a rear contact surface that abuts on the rear surface of the through hole in the traveling direction. In a contact state where the contact surface is in contact with the front surface of the through hole and the rear contact surface is in contact with the rear surface of the through hole, the rear mounting member can be fixed to the lower end side of the rear extension portion. It is good to have a mechanism. As described above, the front mounting member and the rear mounting member have both the front contact surface and the rear contact surface, respectively, so that the crawler unit can be moved from the reduced state to the expanded state and in the expanded state. Can be more effectively suppressed from swinging from side to side. Further, since the front mounting member and the rear mounting member have a fixing function of being fixed to the extension portion of the axle, it is possible to prevent these extension portions from rotating.

The fixing mechanism of the front mounting member and the rear mounting member is a fixing pin, and the front extension and the front mounting member are in the contact state with the front extension and the front mounting member. The front mounting member is fixed to the lower end of the front extension by inserting the fixing pin into the fixing hole, and the rear extension and the rear extension are fixed. The rear mounting member has a fixing hole in which the rear extension portion and the rear mounting member are continuously penetrated in the contact state, and the rear mounting member is inserted into the fixing hole to mount the rear portion. The member may be fixed to the lower end side of the rear extension portion. With the above fixing function, the front mounting member can be fixed only by inserting a fixing pin into the fixing hole while continuously penetrating the front extension portion of the front axle and the fixing hole of the front mounting member. Further, the rear mounting member can be fixed only by inserting the fixing pin into the fixing hole while continuously penetrating the fixing holes of the rear extension portion and the rear mounting member of the rear axle. Since the front mounting member and the rear mounting member can be fixed with such a simple configuration, the weight and the manufacturing cost can be reduced.

In the expanded state, the crawler frame has a fixing hole on the lower surface of the through hole in the front portion in the traveling direction so as to continuously penetrate the fixing hole in the extension portion in the front portion, and penetrates the rear portion in the traveling direction. It is preferable to have a fixing hole on the lower surface of the hole so as to continuously penetrate the fixing hole of the rear extension portion. With this configuration, the front extension portion of the front axle, the front mounting member, and the crawler frame can be fixed so as not to move with each other in the enlarged state. In addition, the rear extension portion of the rear axle, the rear mounting member, and the crawler frame can be fixed so as not to move with each other in the enlarged state. Therefore, it is possible to more effectively prevent the crawler unit from swinging from side to side.

The crawler frame may have a storage portion for accommodating the front mounting member and the rear mounting member. By providing the crawler frame with a storage portion for storing the detachable front mounting member and the rear mounting member in this way, the front mounting member and the rear mounting member can be efficiently attached and detached.

When the side surface of the through hole is composed of a curved surface, the "front surface in the traveling direction of the through hole" refers to a surface including at least the frontmost position of the through hole, and the "rear surface in the traveling direction of the through hole" is used. Refers to the surface including at least the rearmost position of the through hole.

As described above, in the traveling body of the construction machine of the present invention, the distance between the crawler units can be easily expanded or contracted, the crawler frame is less likely to be damaged, and the weight and manufacturing cost can be reduced.

FIG. 1 is a schematic side view showing an example of a construction machine having a traveling body of the construction machine according to the embodiment of the present invention. FIG. 2 is a schematic cross-sectional view of the traveling body of the construction machine of FIG. 1 as viewed from above. FIG. 3 is a schematic perspective view of an extension portion of the axle of FIG. FIG. 4 is a schematic perspective view showing a state in which the first mounting member and the second mounting member are fitted to the extension portion of the axle of FIG. FIG. 5 is a schematic cross-sectional view showing a state of the fixing pin of the second mounting member in the enlarged state.

Hereinafter, the traveling body of the construction machine according to the present invention will be described with reference to the drawings.

The traveling body of the construction machine of the present invention (hereinafter, also simply referred to as “traveling body”) is a traveling body used in a construction machine as shown in FIG. 1, for example. The construction machine shown in FIG. 1 includes a traveling body 1 of the present invention, an upper rotating body 2 mounted on the lower traveling body 1 so as to be able to turn horizontally, and a crane attachment undulatingly attached to the upper turning body 2. Mainly equipped with 3.

[Upper swivel body]
The upper swing body 2 includes a cabin for the operator, an undulating device for undulating the crane attachment 3, an engine, a hydraulic pump driven by the engine, and the like.

[Crane attachment]
The crane attachment 3 is, for example, a part where a load is directly hung for work. The crane attachment 3 has, for example, a configuration in which a hook is attached to the tip of a lattice boom.

[Running body]
Hereinafter, the traveling body 1 of the present invention will be described in detail.

As shown in FIG. 2, the traveling body 1 includes a car body 10, a pair of crawler units 20 attached to the car body 10, and a front axle 30 spanning the front portion of the pair of crawler units 20 in the traveling direction. A rear axle 40 spanned to the rear portion of the pair of crawler units 20 in the traveling direction, and a scaling device 50 for expanding or contracting the distance between the pair of crawler units 20. The traveling body 1 imparts a self-propelling ability to the construction machine, and enables movement in the site, for example. In FIG. 2, the direction of the arrow is the traveling direction of the traveling body 1.

<Car body>
The car body 10 is a frame that supports the upper swing body 2. The car body 10 has a swivel bearing or the like for rotating the upper swivel body 2.

<Crawler unit>
The crawler unit 20 includes a crawler frame 21 and a crawler 22 arranged on the crawler frame 21. Further, the pair of crawler units 20 are arranged apart from each other in the vehicle width direction. In FIG. 2, the crawler unit 20 on the left side shows a reduced state in which the separation distance is minimized, and the crawler unit 20 on the right side shows an expanded state in which the separation distance is maximized. 20 is normally controlled to be in a reduced state or both in an expanded state.

Each of the crawler frames 21 has a front through hole 21a at the front portion in the traveling direction and a rear through hole 21b at the rear portion in the traveling direction. That is, the crawler frame 21 has two through holes in the front and rear in the traveling direction. The front axle 30 described later penetrates through the front through hole 21a, and the rear axle 40 penetrates through the rear through hole 21b. The front through hole 21a and the rear through hole 21b of the crawler frame 21 are formed in a rectangular shape in a side view.

Further, each crawler frame 21 has a first storage portion 21c for storing a first front mounting member 33 and a first front mounting member 33, which will be described later, and a second front mounting member 34 and a second rear mounting, which will be described later. It has a second storage unit 21d for storing the member 44. Since there are two first front mounting members 33 and two first rear mounting members 43 in total, each crawler frame 21 has two first storage portions 21c. Similarly, each crawler frame 21 has two second storage units 21d. By providing the crawler frame 21 with a storage portion for accommodating the first front mounting member 33, the first rear mounting member 43, the second front mounting member 34, and the second rear mounting member 44, which are detachable in this way, each The mounting member can be attached and detached efficiently.

The arrangement positions of the first storage unit 21c and the second storage unit 21d are not particularly limited as long as the traveling of the traveling body 1 is not hindered. The crawler frame 21 on the left side of FIG. 2 illustrates a state in which the second front mounting member 34 and the second rear mounting member 44 are stored. As described above, it is preferable that the first storage unit 21c and the second storage unit 21d are arranged so that they can be stored so as not to protrude outward from the crawler 22 in the vehicle width direction in a plan view when the mounting members are stored. From the viewpoint of attachment / detachment efficiency of each mounting member, it is preferable that one of the two first storage portions 21c is close to the front through hole 21a and the other is close to the rear through hole 21b. .. Similarly, it is preferable that two second storage portions 21d are arranged so that one is close to the front through hole 21a and the other is close to the rear through hole 21b.

Further, as a method of storing the first front mounting member 33 and the first rear mounting member 43 in the first storage portion 21c, the first front mounting member 33 and the first rear mounting member 43 can be held so as not to fall off. The present invention is not particularly limited, and examples thereof include a method of fixing to a support rack with a fixing band or the like, a method of using a box into which the first front mounting member 33 and the first rear mounting member 43 can be fitted, and the like. The same can be applied to the method of storing the second front mounting member 34 and the second rear mounting member 44 in the second storage portion 21d.

The crawler 22 is mounted on the outer periphery of the crawler frame 21 via a drive sprocket, an idler, and a roller (not shown).

<Front axle>
The front axle 30 is bridged between the front through holes 21a of each crawler frame 21 of the pair of crawler units 20. That is, the front axle 30 is bridged in the vehicle width direction.

The front axle 30 has a front axle body 31, a pair of front extension portions 32 protruding from both ends of the front axle body 31, and a first front attachment that is detachably configured on the front extension portion 32. A member 33 and a second front mounting member 34 are provided.

(Front axle body)
The front axle body 31 fits into the front through hole 21a of the crawler frame 21 in a reduced state in which the distance between the pair of crawler units 20 is reduced in the vehicle width direction. That is, the cross-sectional shape of the front axle body 31 matches the cross-sectional shape of the front through hole 21a of the crawler frame 21.

(Front extension)
The front extension portion 32 projects outward in the vehicle width direction of the crawler frame 21 in the reduced state. As shown in FIG. 3, the front extension portion 32 is configured to be rotatable around the rotation shaft 32a from the vehicle width direction to the traveling direction. As shown in FIG. 2, the front extension portion 32 is fixed and used in the vehicle width direction in the enlarged state, is rotated in the traveling direction in the reduced state, and is stored along the crawler frame 21. It is preferable that the front extension portion 32 is stored so as not to protrude outward in the vehicle width direction from the crawler 22 in a plan view when rotated in the traveling direction.

The width of the front extension portion 32 (the thickness of the front extension portion 32 in the tangential direction of the rotation circle) is smaller than the width of the front axle body 31 in order to facilitate the rotation of the front extension portion 32. There is. On the other hand, the height of the front extension portion 32 is configured to be the same as the height of the front axle body 31 in order to maintain the postures of the car body 10 and thus the upper swing body 2 and the crane attachment 3, and the front portion of the crawler frame 21. When the crawler unit 20 is moved from the reduced state to the expanded state in the through hole 21a and in the expanded state (hereinafter, both states are collectively referred to as "expanding / contracting"), the upper surface of the front through hole 21a is contacted. It has an upper contact surface 32b in contact with the lower contact surface 32c and a lower contact surface 32c in contact with the lower surface of the front through hole 21a. Since the weight of the car body 10 and thus the upper swing body 2 and the crane attachment 3 is mainly supported by the lower contact surface 32c, the area of the lower contact surface 32c is preferably larger than the area of the upper contact surface 32b. Specifically, the front extension portion 32 has a longer lower edge than the upper edge, and the tip end side of the front extension portion 32 is inclined so as to spread from the upper edge side to the lower edge side.

The front extension portion 32 has a notch 32d in which the first front mounting member 33, which will be described later, can be fitted in the upper portion on the front axle body 31 side. Further, the front extension portion 32 has a fixing hole 32e penetrating in the vertical direction on the tip side.

(First front mounting member)
As shown in FIG. 4, the first front mounting member 33 includes a first mating portion 33a that fits into the notch 32d of the front extension portion 32, a side surface of the front extension portion 32 and a crawler in the enlarged state. It has a second mating portion 33b that fits between the side surface of the front through hole 21a of the frame 21. The first front mounting member 33 can fix the front extension 32 in the vehicle width direction only by fitting it into the notch 32d of the front extension 32, and does not require a fixing member such as a screw, so that the weight and weight and The manufacturing cost can be reduced. Further, since the first front mounting member 33 is fitted to the front axle main body 31 side, when the crawler unit 20 is moved from the reduced state to the expanded state, the first front mounting member 33 is a crawler from the beginning. It is possible to more effectively prevent the crawler unit 20 from swinging to the left or right by abutting on the side surface of the front through hole 21a of the frame 21.

The second mating portion 33b has a contact surface 33c that comes into contact with the front axle main body 31 in a mated state with the notch 32d of the front extension portion 32. The contact surface 33c can prevent the front extension portion 32 from rotating during expansion and contraction. Further, the first mating portion 33a is configured so that one of the side surfaces is flush with the contact surface 33c, and the area of the second mating portion 33b that comes into contact with the front axle main body 31 is increased. ..

Further, the second mating portion 33b comes into contact with the front surface of the front through hole 21a of the crawler frame 21 in the traveling direction. That is, the first front mounting member 33 has a front contact surface 33d that abuts on the front surface of the front through hole 21a in the front portion in the traveling direction.

(Second front mounting member)
As shown in FIG. 4, the second front mounting member 34 is configured to be fitable on the tip end side of the front extension portion 32. Specifically, the second front attachment member 34 is configured so that the fixing hole 32e at the tip of the front extension portion 32 can be attached across the width direction of the front extension portion 32. That is, the second front mounting member 34 is mounted so as to sandwich both side surfaces of the front extension portion 32. Further, the second front mounting member 34 is configured so that the lower surface thereof and the lower contact surface 32c of the front extension portion 32 are flush with each other.

Further, the second front mounting member 34 is configured to fit into the front through hole 21a of the crawler frame 21 in the traveling direction. That is, the second front mounting member 34 has both a front contact surface 34a that abuts on the front surface of the front through hole 21a in the traveling direction and a rear contact surface 34b that abuts on the rear surface of the front through hole 21a in the traveling direction.

In the second front mounting member 34, the front contact surface 34a is in contact with the front surface of the front through hole 21a of the crawler frame 21, and the rear contact surface 34b is in contact with the rear surface of the front through hole 21a. It has a fixing hole 34c that continuously penetrates the fixing hole 32e of the front extension portion 32. In the above contact state, the fixing hole 32e of the front extension portion 32 and the fixing hole 34c of the second front mounting member 34 are continuously penetrated. Therefore, as shown in FIG. 4, the fixing pin 34d is used. By inserting it into the fixing hole, the second front mounting member 34 can be fixed to the lower end side of the front extension portion 32. That is, the second front mounting member 34 includes a fixing mechanism capable of fixing the second front mounting member 34 to the lower end side of the front extension portion 32 in the contact state. As shown in FIG. 4, it is preferable that the fixing pin 34d is provided with a retaining pin 34e for preventing the fixing pin 34d from coming off after being inserted. Further, the fixing pin 34d and the retaining pin 34e may also be used as a pin for fixing the front extension portion 32 in the traveling direction in the reduced state.

Further, as shown in FIG. 5, the crawler frame 21 of the crawler unit 20 has a fixing hole 21e on the lower surface of the front through hole 21a, and the front extension portion 32 of the front axle 30 is fixed in the enlarged state. It can be in a state of continuously penetrating the hole 32e. That is, the fixing pin 34d of the second front mounting member 34 has a fixing hole 32e of the front extension portion 32 that is continuous in the expanded state, a fixing hole 34c of the second front mounting member 34, and a fixing hole 21e of the crawler frame 21. Penetrate. With this configuration, the front extension portion 32, the second front mounting member 34, and the crawler frame 21 of the front axle 30 can be fixed so as not to move with each other in the enlarged state. Therefore, it is possible to more effectively prevent the crawler unit 20 from swinging to the left or right.

The lower surface of the fixing pin 34d penetrates the front portion in a state where the fixing hole 32e of the front extension portion 32, the fixing hole 34c of the second front mounting member 34, and the fixing hole 21e of the crawler frame 21 are penetrated. It is preferable that the lower surface of the hole 21a does not protrude from the lower surface of the lower wall 21f. If the fixing pin 34d protrudes from the lower surface of the lower wall 21f, it may come into contact with the crawler 22 and hinder running.

<Rear axle>
The rear axle 40 is bridged between the rear through holes 21b of each crawler frame 21 of the pair of crawler units 20. That is, the rear axle 40 is bridged in the vehicle width direction.

The rear axle 40 includes a rear axle body 41, a pair of rear extension portions 42 protruding from both ends of the rear axle body 41, a first rear mounting member 43 detachably attached to the rear extension portion 42, and a second rear axle body. A rear mounting member 44 is provided.

(Rear axle body)
The rear axle body 41 fits into the rear through hole 21b of the crawler frame 21 in a reduced state in which the distance between the pair of crawler units 20 is reduced in the vehicle width direction. That is, the cross-sectional shape of the rear axle body 41 matches the cross-sectional shape of the rear through hole 21b of the crawler frame 21.

(Rear extension)
The rear extension portion 42 projects outward in the vehicle width direction of the crawler frame 21 in the reduced state. The rear extension portion 42 is configured to be rotatable from the vehicle width direction to the traveling direction.

The rear extension portion 42 has a notch in the upper portion on the rear axle body 41 side to which the first rear mounting member 43 described later can be fitted. Except for the above points, the rear extension portion 42 can be configured in the same manner as the front extension portion 32, and therefore detailed description thereof will be omitted.

(1st rear mounting member)
The first rear mounting member 43 is between the first mating portion that fits into the notch of the rear extension portion 42 and the side surface of the rear extension portion 42 and the side surface of the rear through hole 21b of the crawler frame 21 in the enlarged state. It has a second mating portion that fits into.

The second mating portion abuts on the rear surface of the rear through hole 21b of the crawler frame 21 in the traveling direction. That is, the first rear mounting member 43 has a rear contact surface that abuts on the rear surface of the rear through hole 21b at the rear in the traveling direction.

The first rear mounting member 43 can be configured in the same manner as the first front mounting member 33 except that it has a rear contact surface that abuts on the rear surface of the rear through hole 21b at the rear in the traveling direction. Is omitted.

In FIG. 4 for explaining the first front mounting member 33, in the case of the first rear mounting member 43 mounted on the rear axle 40 rearward in the traveling direction, the front contact surface 34a and the rear contact surface 34b are shown in FIG. On the contrary, the side where the second mating portion of the first rear mounting member 43 is mounted is the rear contact surface.

(Second rear mounting member)
The second rear mounting member 44 has both a front contact surface that abuts on the front surface of the rear through hole 21b in the traveling direction and a rear contact surface that abuts on the rear surface of the rear through hole 21b in the traveling direction. In the second rear mounting member 44, the front extension portion 42 is in a contact state in which the front contact surface is in contact with the front surface of the rear through hole 21b and the rear contact surface is in contact with the rear surface of the rear through hole 21b. A fixing mechanism capable of fixing the second rear mounting member 44 is provided in the lower portion on the tip side.

Since the second rear mounting member 44 can be configured in the same manner as the second front mounting member 34, detailed description thereof will be omitted.

<Scale device>
The expansion / contraction device 50 moves the crawler frame 21 in the vehicle width direction so as to expand / contract the distance between the pair of crawler units 20.

The expansion / contraction device 50 is not particularly limited as long as it can expand or contract the distance between the crawler units 20, but may be configured by, for example, horizontal cylinders provided on each of the left and right sides.

[Extension operation method of the traveling body]
The expansion operation method of the traveling body 1 from the reduced state to the expanded state is an extension portion rotation step, a first mounting member mounting step, a second mounting member mounting step, an expansion step, and a second mounting member. It has a fixing process.

(Extension rotation process)
In the extension rotation step, the front extension 32 of the front axle 30 and the rear extension 42 of the rear axle 40 are rotated in the vehicle width direction.

The front extension portion 32 and the rear extension portion 42 can be rotated in the same procedure. Therefore, the front extension portion 32 will be described as an example. The front extension portion 32 of the front axle 30 is stored in the traveling direction in the reduced state, and is fixed by the fixing pin 34d and the retaining pin 34e of the second front mounting member 34. Therefore, in the extension fixing step, first, the fixing pin 34d and the retaining pin 34e fixing the front extension portion 32 are removed. Next, the front extension portion 32 is rotated by about 90 ° so that the tip of the front extension portion 32 is on the outside in the vehicle width direction.

(First mounting member mounting process)
In the first mounting member mounting process, the first front mounting member 33 and the first rear mounting member 43 stored in the first storage portion 21c of the crawler frame 21 are taken out, and the first front mounting member 33 is attached to the front axle. It is attached to the front extension portion 32 of 30, and the first rear attachment member 43 is attached to the rear extension portion 42 of the rear axle 40.

Specifically, the first front mounting member 33 is fitted into the notch 32d of the front extension portion 32, and the first front mounting member 33 is brought into contact with the front axle main body 31. The first front mounting member 33 comes into contact with the front surface of the front through hole 21a of the crawler frame 21 in the traveling direction. The first front mounting member 33 can prevent the front extension 32 from rotating, and can fix the front extension 32.

Further, the first rear mounting member 43 is fitted into the notch of the rear extension portion 42, and the first rear mounting member 43 is brought into contact with the rear axle main body 41. Further, in the first rear mounting member 43, the crawler frame 21 is brought into contact with the rear surface of the rear through hole 21b in the traveling direction. The first rear mounting member 43 can prevent the rear extension 42 from rotating, and can fix the rear extension 42.

(Second mounting member mounting process)
In the second mounting member mounting process, the second front mounting member 34 and the second rear mounting member 44 stored in the second storage portion 21d of the crawler frame 21 are taken out, and the second front mounting member 34 is attached to the front axle. It is attached to the front extension portion 32 of 30, and the second rear attachment member 44 is attached to the rear extension portion 42 of the rear axle 40. The second front mounting member 34 is mounted so as to sandwich both side surfaces of the front extension portion 32, and the second rear mounting member 44 is mounted so as to sandwich both side surfaces of the rear extension portion 42.

In addition, the extension portion of the axle has two front extension portions 32 and two rear extension portions 42 in total, and the extension portion rotation step, the first mounting member mounting step, and the first mounting member mounting step are provided for each extension portion. 2 Perform the mounting member mounting process. These steps may be performed on four extension portions in each step, and the extension portion rotation step, the first mounting member mounting step, and the second mounting member mounting step are repeatedly performed for each extension portion. You may. Further, the first mounting member mounting step and the second mounting member mounting step can be performed from the second mounting member mounting step.

(Expansion process)
In the expansion step, the expansion / contraction device 50 brings the pair of crawler units 20 into the enlarged state.

Specifically, the horizontal cylinder is extended to increase the separation distance between the pair of crawler units 20. At this time, the first front mounting member 33 and the second front mounting member 34 abut on the side surface of the front through hole 21a of the crawler frame 21, and the first rear mounting member 43 and the second rear mounting member 44 are in contact with the crawler frame. Since the separation distance of the pair of crawler units 20 can be increased in a state of being in contact with the side surface of the rear through hole 21b of 21, the crawler unit 20 can be expanded stably and smoothly.

(Second mounting member fixing process)
In the second mounting member fixing step, the second front mounting member 34 and the second rear mounting member 44 are fixed.

Specifically, in the enlarged state, the fixing hole 32e of the front extension portion 32, the fixing hole 34c of the second front mounting member 34, and the fixing hole 21e of the front through hole 21a of the crawler frame 21 continuously penetrate. do. A fixing pin 34d is inserted into this fixing hole to fix the second front mounting member 34. Further, the retaining pin 34e prevents the fixing pin 34d from coming off. The second rear mounting member 44 is also fixed by the same procedure.

[How to reduce the size of the vehicle]
The expansion operation method of the traveling body 1 from the enlarged state to the reduced state can be performed in the reverse procedure of the above-mentioned expansion operation method. That is, the expansion operation method is performed by a second mounting member fixing release step of pulling out the fixing pin and the retaining pin to release the fixing of the second front mounting member 34 and the second rear mounting member 44, and the expansion / contraction device 50. A reduction step of bringing the pair of crawler units 20 into the reduced state, and a second mounting member removal step of removing the second front mounting member 34 and the second rear mounting member 44 and storing them in the second storage portion 21d of the crawler frame 21. A first mounting member removing step and an extension storage step of removing the first front mounting member 33 and the first rear mounting member 43 and storing the crawler frame 21 in the first storage portion 21c are provided.

Since the operation of each step may be performed in the reverse procedure of the above-mentioned extended operation method, detailed description thereof will be omitted.

[advantage]
The traveling body 1 of the construction machine is configured such that the front extension portion 32 of the front axle 30 and the rear extension portion 42 of the rear axle 40 are rotatable from the vehicle width direction to the traveling direction. By rotating the direction of the crawler unit 20, the distance between the crawler units 20 can be easily expanded or contracted without the work of attaching and detaching the extension portion.

Further, the traveling body 1 of the construction machine has a first front mounting member 33 and a second front mounting member 34 for fixing the front extension portion 32 in the vehicle width direction, and has the first front mounting member 33 and the first front mounting member 33. The second front mounting member 34 has a front contact surface that abuts on the front surface of the front through hole 21a in the traveling direction. The traveling body 1 of the construction machine has a first rear mounting member 43 and a second rear mounting member 44 for fixing the rear extension portion 42 in the vehicle width direction, and the first rear mounting member 43 and the second rear mounting member 44. Has a rear contact surface that abuts on the rear surface of the rear through hole 21b in the traveling direction. Before moving the crawler unit 20 from the reduced state to the expanded state, the traveling body 1 of the construction machine is equipped with these mounting members and maintains the mounting even in the expanded state. Therefore, the traveling body 1 of the construction machine is the front contact of the first front mounting member 33 and the second front mounting member 34 when the crawler unit 20 is moved from the reduced state to the expanded state and in the expanded state. The contact surface abuts on the side surface of the front through hole 21a of the crawler unit 20, and the rear abutment surface of the first rear mounting member 43 and the second rear mounting member 44 hits the side surface of the rear through hole 21b of the crawler unit 20. By touching it, the crawler unit 20 is prevented from swinging to the left or right. Therefore, the traveling body 1 of the construction machine is less likely to damage the crawler frame 21.

Further, since the traveling body 1 of the construction machine has these mounting members, it does not require a new stopper arm or the like for stabilizing the posture of the crawler unit 20, so that the weight and the manufacturing cost can be reduced.

[Other embodiments]
The above embodiment does not limit the configuration of the present invention. Therefore, the above-described embodiment can be omitted, replaced or added with components of each part of the above-described embodiment based on the description of the present specification and the common general technical knowledge, and all of them are construed to belong to the scope of the present invention. Should be.

In the above embodiment, as an expansion operation method of the traveling body, a method in which the second front mounting member and the second rear mounting member are mounted in the second mounting member mounting step, and then the pair of crawler units are expanded in the expansion step. However, in a traveling body having both a first mounting member (first front mounting member and first rear mounting member) and a second mounting member (second front mounting member and second rear mounting member), The second mounting member mounting step may be performed after the expansion step is performed. Even if only the first mounting member is used, the separation distance of the crawler unit can be stably and smoothly expanded. Further, by attaching the second mounting member after the expansion step, it is possible to effectively prevent the crawler unit from swinging to the left or right in the expanded state.

In the above embodiment, the case where the traveling body has both the first mounting member and the second mounting member has been described, but the traveling body having only the first mounting member and the traveling body having only the second mounting member are also the present invention. Is the intention of. Even in these traveling bodies, the distance between the crawler units can be easily expanded or contracted, and the crawler frame is less likely to be damaged. Further, since only one of the mounting members is provided, the weight and the manufacturing cost can be further reduced.

In the above embodiment, the case where the crawler frame has a first storage portion and a second storage portion for storing the mounting member has been described, but these storage portions are not essential components, and one or both of them can be omitted. Is. When such a storage portion is not provided, for the mounting member that is not stored, a tool box may be provided in the upper swing body, for example, and stored in the tool box, in addition to the traveling body.

In the above embodiment, the case where the second mounting member, the extension portion of the axle, and the crawler frame are fixed by the fixing pin as the fixing mechanism of the second mounting member has been described, but the object to be fixed by the fixing pin is the second mounting. It may be only an extension of a member and an axle. In this case, in order to prevent the crawler unit from swinging to the left or right, it is preferable to separately provide an extension portion of the axle and a mechanism for fixing the crawler frame.

Further, the fixing mechanism of the second mounting member is not limited to the fixing pin, and may be another mechanism. For example, it may be a fixing mechanism using a fixing piece such that the second mounting member and the extension portion of the axle are locked by sliding.

Further, it is also an object of the present invention that the second mounting member does not have a fixing function. For example, the second mounting member can be fixed by the frictional force of the contact surface between the second mounting member and the extension portion of the axle.

The first mounting member and the second mounting member are not limited to the configuration described in the above embodiment. The mounting member mounted on the axle in the front of the traveling direction has a front contact surface that abuts on the front surface of the through hole in the traveling direction, and the mounting member mounted on the axle in the rear of the traveling direction is the through hole. As long as the mounting member has a rear contact surface that abuts on the rear surface in the traveling direction, the same effect can be obtained even with other configurations.

In the traveling body of the construction machine of the present invention, the distance between the crawler units can be easily expanded or contracted, the crawler frame is less likely to be damaged, and the weight and manufacturing cost can be reduced.

1 Traveling body 2 Upper swivel body 3 Crane attachment 10 Car body 20 Crawler unit 21 Crawler frame 21a Front through hole 21b Rear through hole 21c First storage part 21d Second storage part 21e Fixing hole 21f Lower wall 22 Crawler 30 Front axle 31 Front axle body 32 Front extension 32a Rotating shaft 32b Upper contact surface 32c Lower contact surface 32d Notch 32e Fixing hole 33 First front mounting member 33a First mating part 33b Second mating part 33c, 33d Contact surface 34 Second front mounting member 34a Front contact surface 34b Rear contact surface 34c Fixing hole 34d Fixing pin 34e Retaining pin 40 Rear axle 41 Rear axle body 42 Rear extension 43 First rear mounting member 44 Second Rear mounting member 50 scaling device

Claims (6)

Each of the pair of crawler units having a crawler frame having through holes at two points in the front and rear in the traveling direction and the crawlers arranged in the crawler frame and arranged apart from each other in the vehicle width direction, and the pair of crawler units. The front axle that spans between the through holes at the front of the crawler frame in the traveling direction, the rear axle that spans between the through holes at the rear of each crawler frame in the traveling direction of the pair of crawler units, and the pair of crawler units. A traveling body of a construction machine provided with a scaling device for moving the crawler frame in the vehicle width direction so as to expand or contract the distance between the crawlers.
The front axle above
Front axle body and
A pair of crawler frames that project outward in the vehicle width direction and rotate in the vehicle width direction from the vehicle width direction in a reduced state in which the distance between the pair of crawler units is reduced in the vehicle width direction at both ends of the front axle body. Front extension and
The front extension has a removable front mounting member.
The rear axle above
With the rear axle body,
A pair of rear parts that project outward in the vehicle width direction of the crawler frame and rotate from the vehicle width direction to the traveling direction in a reduced state in which the distance between the pair of crawler units is reduced in the vehicle width direction at both ends of the rear axle body. With the extension
The rear extension has a removable rear mounting member.
In the expanded state where the distance between the pair of crawler units is widened in the vehicle width direction,
The front mounting member and the rear mounting member are configured to fix the front extension portion and the rear extension portion in the vehicle width direction, respectively.
The front extension portion has a lower contact surface that abuts on the lower surface of the through hole in the front portion in the traveling direction.
The rear extension portion has a lower contact surface that abuts on the lower surface of the through hole at the rear portion in the traveling direction .
The front mounting member
It has both a front contact surface that abuts on the front surface of the through hole in the front part of the traveling direction in the traveling direction and a rear contact surface that abuts on the rear surface of the through hole in the traveling direction.
In a contact state where the front contact surface is in contact with the front surface of the through hole and the rear contact surface is in contact with the rear surface of the through hole, the front mounting member is placed on the lower end side of the front extension portion. Equipped with a fixing mechanism that can fix
The rear mounting member
It has both a front contact surface that contacts the front surface of the through hole at the rear in the travel direction and a rear contact surface that contacts the rear surface of the through hole in the travel direction.
The rear mounting member is fixed to the lower end side of the rear extension portion in a contact state in which the front contact surface abuts on the front surface of the through hole and the rear contact surface abuts on the rear surface of the through hole. Equipped with a possible fixing mechanism,
The fixing mechanism of the front mounting member and the rear mounting member is a fixing pin.
The front extension portion and the front mounting member have a fixing hole in which the front extension portion and the front mounting member are continuously penetrated in the contact state.
By inserting the fixing pin into the fixing hole, the front mounting member is fixed to the lower end side of the front extension portion.
The rear extension portion and the rear mounting member have a fixing hole in which the rear extension portion and the rear mounting member are continuously penetrated in the contact state.
A traveling body of a construction machine that fixes the rear mounting member to the lower end side of the rear extension portion by inserting the fixing pin into the fixing hole . The front extension portion has a notch in the upper portion on the front axle body side to which the front mounting member can be fitted.
The front mounting member has a contact surface that abuts on the front axle body in a fitted state with the notch of the front extension.
The rear extension portion has a notch in the upper portion on the rear axle body side to which the rear mounting member can be fitted.
The traveling body of a construction machine according to claim 1, wherein the rear mounting member has a contact surface that abuts on the rear axle body in a state of being fitted to the notch of the rear extension portion. In the expanded state, the crawler frame has a fixing hole on the lower surface of the through hole in the front portion in the traveling direction so as to continuously penetrate the fixing hole in the extension portion in the front portion, and penetrates the rear portion in the traveling direction. The traveling body of a construction machine according to claim 1 or 2 , wherein the lower surface of the hole has a fixing hole that continuously penetrates the fixing hole of the rear extension portion. Each of the pair of crawler units having a crawler frame having through holes at two points in the front and rear in the traveling direction and the crawlers arranged in the crawler frame and arranged apart from each other in the vehicle width direction, and the pair of crawler units. The front axle that spans between the through holes at the front of the crawler frame in the traveling direction, the rear axle that spans between the through holes at the rear of each crawler frame in the traveling direction of the pair of crawler units, and the pair of crawler units. A traveling body of a construction machine provided with a scaling device for moving the crawler frame in the vehicle width direction so as to expand or contract the distance between the crawlers.
The front axle above
Front axle body and
A pair of crawler frames that project outward in the vehicle width direction and rotate in the vehicle width direction from the vehicle width direction in a reduced state in which the distance between the pair of crawler units is reduced in the vehicle width direction at both ends of the front axle body. Front extension and
The front extension has a removable front mounting member.
The rear axle above
With the rear axle body,
A pair of rear parts that project outward in the vehicle width direction of the crawler frame and rotate from the vehicle width direction to the traveling direction in a reduced state in which the distance between the pair of crawler units is reduced in the vehicle width direction at both ends of the rear axle body. With the extension
The rear extension has a removable rear mounting member.
In the expanded state where the distance between the pair of crawler units is widened in the vehicle width direction,
The front mounting member and the rear mounting member are configured to fix the front extension portion and the rear extension portion in the vehicle width direction, respectively.
The front extension portion has a lower contact surface that abuts on the lower surface of the through hole in the front portion in the traveling direction.
The rear extension portion has a lower contact surface that abuts on the lower surface of the through hole at the rear portion in the traveling direction.
The front mounting member has a front contact surface that abuts on the front surface of the through hole in the front portion in the traveling direction in the traveling direction.
The rear mounting member has a rear contact surface that abuts on the rear surface of the through hole at the rear in the traveling direction in the traveling direction .
The front extension portion has a notch in the upper portion on the front axle body side to which the front mounting member can be fitted.
Between the first mating portion where the front mounting member fits into the notch of the front extension and the side surface of the front extension and the side surface of the through hole in the front in the traveling direction in an enlarged state. Has a second kanhe that fits into
The second mating portion of the front mounting member has the front contact surface and the contact surface that abuts on the front axle body, and one of the side surfaces of the first fitting portion is the above-mentioned hit surface. It is configured to be flush with the contact surface,
The rear extension portion has a notch in the upper portion on the rear axle body side to which the rear mounting member can be fitted.
The rear mounting member fits between the first fitting portion that fits into the notch of the rear extension portion and the side surface of the rear extension portion and the side surface of the through hole at the rear portion in the traveling direction in an enlarged state. It has a second kanhe part and
The second mating portion of the rear mounting member has the rear contact surface and the contact surface that abuts the rear axle body, and one of the side surfaces of the first fitting portion is the contact surface. A traveling body of construction machinery that is configured to be flush with each other . The front mounting member
It has both a front contact surface that abuts on the front surface of the through hole in the traveling direction in the traveling direction and a rear contact surface that abuts on the rear surface in the traveling direction of the through hole.
In a contact state where the front contact surface is in contact with the front surface of the through hole and the rear contact surface is in contact with the rear surface of the through hole, the front mounting member is placed on the lower end side of the front extension portion. Equipped with a fixing mechanism that can fix
The rear mounting member
It has both a front contact surface that contacts the front surface of the through hole at the rear in the travel direction and a rear contact surface that contacts the rear surface of the through hole in the travel direction.
The rear mounting member is fixed to the lower end of the rear extension portion in a contact state in which the front contact surface is in contact with the front surface of the through hole and the rear contact surface is in contact with the rear surface of the through hole. The traveling body of a construction machine according to claim 4, further comprising a possible fixing mechanism. The traveling body of a construction machine according to any one of claims 1 to 5, wherein the crawler frame has a storage unit for storing the front mounting member and the rear mounting member.

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