JP2024021429A - Lower traveling body and construction machine - Google Patents

Abstract

To provide a lower traveling body which can fix a transformer lifter to an intermediate position without the necessity of processing to the lower traveling body itself.SOLUTION: A lower traveling body of one embodiment of the present invention comprises a pair of crawler units which are arranged while separating from each other in a vehicle width direction, a car body to which the crawler units are detachably attached, and a transformer lifter for lifting the car body. The transformer lifter has an arm attached to the car body so as to be turnable, and a fixing mechanism for fixing the arm obliquely with respect to the vehicle width direction in a plane view, and the fixing mechanism has a penetration hole which penetrates the car body and can expose a side edge of the arm, and a fixing pin inserted into the penetration hole and abutting on the side edge from a sideway.SELECTED DRAWING: Figure 4

Description

The present invention relates to an undercarriage and a construction machine.

Some large construction machines have crawler units removed when being transported, for example, by trailer. This kind of construction equipment uses a total of four transformers, one on each side of the front and rear of the car body, as a means to lift the car body when loading and unloading the car body onto a trailer after the crawler unit has been removed. A device equipped with a lifter is known (for example, see Japanese Patent Application Laid-Open No. 2013-23849).

The translifter provided in this construction machine includes an arm whose base end is attached to the car body, and a lift cylinder provided at the tip of this arm. The arm is configured to be rotatable between a retracted position parallel to the vehicle width direction of the car body and an extended position extending toward the front or rear of the car body. It is fixed in the out position.

Fixing to the storage position or the extended position is achieved by a positioning through hole provided in the arm, a storage through hole provided in the car body, and continuous with this through hole in the storage position, and this through hole. This is carried out using continuous overhanging through holes at the above-mentioned overhanging position. That is, in the storage position, the positioning through hole and the storage through hole are continuous, so the arm can be fixed so as not to rotate by inserting a positioning pin into the continuous through hole. Similarly, in the overhanging position, positioning pins can be inserted and fixed into the continuous positioning through-hole and the overhanging through-hole.

JP2013-23849A

In the above conventional construction machine, as shown in FIG. 2, when the transformer lifter 10 is fixed in the extended position, which is the working posture, for assembly or daily maintenance, for example, the space between the transformer lifter 10 and the crawler unit 8 is S is sandwiched between the step 83 and the car body 9 at the front and rear, which may make it difficult to access. Furthermore, when the conventional construction machine is transported while being secured to a barge, the securing device and the translifter 10 may interfere with each other.

In such a case, it is effective to fix the arm 11 at an intermediate position between the retracted position and the extended position, as shown in FIG. When the arm 11 is fixed in the intermediate position, a gap is created between the translifter 10 and the step 83, and the space S can be easily accessed from this gap. In order to fix the arm 11 at the intermediate position, for example, it is conceivable to further provide a through hole for the intermediate position in the car body 9, but there is a possibility that it is physically impossible to provide an additional through hole or that the strength may decrease. There is. Although it is possible to fix the tip with wire or the like, it is necessary to attach parts for fixing it to the lower running body of the construction machine. Furthermore, in either method, processing of the undercarriage is required, which tends to result in high labor and processing costs.

The present invention has been made based on the above-mentioned circumstances, and aims to provide an undercarriage body and a construction machine that can fix a transformer lifter at an intermediate position without requiring any processing on the undercarriage body itself. do.

An undercarriage body according to one aspect of the present invention includes a pair of crawler units arranged apart from each other in the vehicle width direction, a car body to which the crawler units are detachably attached, and a transformer for lifting the car body. the transformer lifter has an arm that is rotatably attached to the car body, and a fixing mechanism that fixes the arm diagonally with respect to the vehicle width direction in a plan view, The mechanism has a through hole that penetrates the car body and can expose the side edge of the arm, and a fixing pin that is inserted into the through hole and abuts the side edge from the side.

A construction machine according to another aspect of the present invention includes the undercarriage body of the present invention.

The undercarriage body and construction machine of the present invention do not require any processing on the undercarriage body itself, and the translifter can be fixed at an intermediate position.

FIG. 1 is a schematic side view showing a construction machine according to an embodiment of the present invention. FIG. 2 is a schematic plan view showing the undercarriage of the construction machine shown in FIG. 1, with the arm in an extended position. FIG. 3 shows a state in which the arm in FIG. 2 is fixed to the translifter obliquely. FIG. 4 is a partially enlarged schematic plan view of the car body and transformer lifter shown in FIG. 3. FIG. 5 is a schematic side view of FIG. 4. FIG. 6 is a schematic plan view showing a state in which the fixing pin is removed from FIG. 4. FIG. 7 is a schematic plan view of the fixing pin shown in FIG. 4. FIG. 8 is a schematic side view of the fixing pin shown in FIG. 7. FIG. 9 is a schematic bottom view of the fixing pin shown in FIG. 4. FIG. 10 is a schematic plan view showing the arm in the retracted position in FIG. 4.

[Description of embodiments of the present invention]
The present inventors have focused on the fact that when rotating the arm of the translifter, the side edge of the arm is exposed, for example, to the storage through hole at an intermediate position. Specifically, when the arm rotates below the storage through hole, part of the side edge of the arm passes through the storage through hole in plan view, and part of this side edge and the storage through hole pass through the storage through hole. A gap is created which is defined by the hole. The present inventors have discovered that by inserting a fixing pin that fits into the gap formed when the arm is in the desired intermediate position, the transformer lifter can be fixed in the intermediate position, that is, diagonally, The present invention has been completed.

That is, an undercarriage body according to one aspect of the present invention includes a pair of crawler units disposed apart from each other in the vehicle width direction, a car body to which the crawler units are removably attached, and a vehicle for lifting the car body. a transformer lifter, the transformer lifter having an arm rotatably attached to the car body, and a fixing mechanism that fixes the arm obliquely with respect to the vehicle width direction in a plan view, The fixing mechanism has a through hole that passes through the car body and can expose a side edge of the arm, and a fixing pin that is inserted into the through hole and abuts the side edge from the side.

In the lower traveling body, the side edge of the arm is exposed in the through hole that penetrates the car body, so the fixing pin can be inserted into the gap defined by the side edge of the arm and the through hole. By bringing the fixing pin into contact with the side edge of the arm from the side, the arm can be fixed diagonally with respect to the vehicle width direction in plan view. In the undercarriage body, since the arm is fixed diagonally as described above, no processing is required on the undercarriage body itself. Therefore, the undercarriage body can fix the transformer lifter at an intermediate position without requiring any processing on the undercarriage body itself.

The fixing pin has a first pillar part that fits into the through hole, and a second pillar part that extends from the first pillar part and comes into contact with the side edge, and the second pillar part is connected to the first pillar part. It is preferable that a step be provided at the connection portion with the second pillar portion. By configuring the fixing pin in this way, the fixing pin fits into both the through hole and the gap, so the transformer lifter can be more reliably fixed at the intermediate position.

The transformer lifter has a central shaft that allows the arm to rotate, and a retaining pin that fixes the central shaft to the car body, and when the fixing pin is fitted into the through hole, the It is preferable to have a displacement prevention plate through which the fixing pin passes. By providing the displacement prevention plate in this manner, the transformer lifter can be more reliably fixed at the intermediate position.

The arm is configured to be rotatable between a retracted position parallel to the vehicle width direction and an extended position extending in the running direction, and the transformer lifter is provided on the arm, and is configured to rotate between the retracted position and the extended position. The car body has a positioning through hole for fixing the arm to the car body in the extended position, and the car body has a storage through hole that is continuous with the positioning through hole when the arm is in the storage position. , having an overhanging through hole that is continuous with the positioning through hole when the arm is in the overhanging position, and the through hole is one of the storage through hole and the overhanging through hole. It is good to have this function as well. The present inventors have learned that the side edges of the arms are likely to be exposed in the storage through-hole and the overhanging through-hole. In other words, by making the through hole one of the storage through hole and the overhanging through hole, the transformer lifter can be easily fixed at a desired intermediate position.

When the arm is in the storage position, a side edge of the arm is exposed to the overhanging through hole, and the fixing pin is preferably configured to be insertable into the overhanging through hole. By configuring the fixing pin so that it can be inserted into the overhanging through hole in the stored position, the fixing pin can be stored during transportation, thereby preventing loss of the fixing pin and increasing work efficiency. .

A construction machine according to another aspect of the present invention includes the undercarriage body of the present invention.

Since the construction machine includes the undercarriage body of the present invention, the transformer lifter can be fixed at an intermediate position without requiring any processing on the undercarriage body itself.

Here, "the side edge of the arm is exposed in the through-hole" means that the side edge of the arm is visible inside the through-hole when viewed from the side opposite to the arm position in plan view. do.

[Details of embodiments of the present invention]
EMBODIMENT OF THE INVENTION Hereinafter, a construction machine and an undercarriage body according to an embodiment of the present invention will be described with reference to the drawings as appropriate.

[Construction machinery]
The construction machine 1 shown in FIG. 1 includes a lower traveling body 2, an upper rotating body 3 mounted on the lower traveling body 2 so as to be horizontally swingable, and a boom 4 attached to the upper rotating body 3 so as to be able to raise and lower. , a hook 5, and a wire rope 6 that hangs the hook 5 from the tip of the boom 4.

<Upper rotating body>
The upper revolving body 3 includes an operator's cabin 7 adjacent to the attachment portion of the boom 4, a boom hoisting winch (not shown) for hoisting the boom 4, and the like.

Among these, the operator's cabin 7 is a place where the operator gets in and operates the construction machine 1.

<Boom>
The boom 4 is attached to the upper revolving body 3 so as to be swingable back and forth. The boom 4 has a sheave at its tip that guides the wire rope 6.

<Hook>
The hook 5 is fixed to the lower end of the wire rope 6 and is used to lift or lower a suspended load.

<Wire rope>
The wire rope 6 is wound around a winch (not shown) installed on the upper revolving structure 3 via a sheave at the tip of the boom 4. Note that the winch may be installed on the back side of the boom 4 (the side that is on top when the boom 4 is laid down).

[Lower running body]
The undercarriage body 2 is itself an aspect of the present invention. As shown in FIG. 2, the undercarriage body 2 includes a pair of crawler units 8 spaced apart from each other in the vehicle width direction, a car body 9 to which the crawler units 8 are removably attached, and four transformers. A lifter 10 is provided.

<Crawler unit>
The crawler unit 8 is a traveling device for the undercarriage 2, and includes a crawler frame 81 and a crawler 82 disposed on the crawler frame 81, as shown in FIG.

A step 83 is provided that projects from the crawler frame 81 toward the inner side in the vehicle width direction, that is, between the pair of crawler frames 81 . The work vehicle can board the upper revolving structure 3 using this step 83.

In the undercarriage body 2, the steps 83 are provided on the front and rear sides of the car body 9 with respect to the pair of crawler frames 81, respectively. That is, the lower traveling body 2 has four steps 83. A transformer lifter 10, which will be described later, is rotatably provided between the car body 9 and the step 83. In addition, in order to easily board the upper revolving structure 3 via step 83, when the transformer lifter 10 is in the extended position parallel to the traveling direction, the minimum distance ( The distance between the transformer lifter 10 and the step 83 is such that it is guaranteed that the step 83 does not come into contact with each other.

<Car body>
The car body 9 includes a swing bearing 91 for supporting the revolving upper structure 3 and rotating the revolving upper structure 3, and a frame 92 spanned between the pair of crawler units 8. Further, as shown in FIG. 2, the car body 9 may be provided with car body weights 95 at the front and rear.

The frame 92 includes a front frame 92a located in front of the car body 9 and a rear frame 92b located in the rear of the car body 9.

<Trans lifter>
The transformer lifters 10 are lifters for lifting the car body 9, and a total of four transformer lifters 10 are provided, one on each side at the front and rear of the car body 9. Note that "left and right" means left and right with respect to the forward direction (front) of the lower traveling body 2.

The transformer lifter 10 includes an arm 11 rotatably attached to the car body 9, a cylinder 12 fixed to the tip of the arm 11, a positioning through hole 13 for fixing the arm 11 to the car body 9, and and a fixing mechanism 14 that fixes the arm 11 obliquely with respect to the vehicle width direction (see FIGS. 2 to 5). Further, the transformer lifter 10 has a central shaft 15 that allows the arm 11 to rotate, and a retaining pin 16 that fixes the central shaft 15 to the car body 9.

(arm)
The arm 11 is attached to the car body 9 at its base end via a central shaft 15. The arm 11 is configured to be rotatable between a retracted position parallel to the vehicle width direction and an extended position parallel to the traveling direction. More specifically, a pair of transformer lifters 10 provided at the front of the car body 9 are configured to protrude to the front of the lower running body 2, and a pair of transformer lifters 10 provided at the rear of the car body 9 are configured to protrude to the front of the lower traveling body 2. The transformer lifter 10 is configured to project to the rear of the lower traveling body 2 (on the opposite side to the forward direction).

In this embodiment, the arm 11 rotates 90 degrees between the retracted position and the extended position. Note that the rotation angle of the arm 11 is not limited to 90 degrees, and may be less than 90 degrees or more than 90 degrees. In this case, the arm 11 is not necessarily parallel to the traveling direction in the extended position.

(Cylinder)
The cylinder 12 is located between the arm 11 and the ground in the extended position, and allows the car body 9 to be jacked up. The cylinder 12 can be configured, for example, by a hydraulic cylinder that includes a cylinder body that extends downward from the tip of the arm 11 and a rod that is vertically slidable with respect to the cylinder body.

(Positioning through hole)
The positioning through hole 13 is provided in the arm 11 and is used when fixing the arm 11 in the storage position and the extended position. Specifically, as shown in FIG. 4, the car body 9 has a storage through hole 93 that is continuous with the positioning through hole 13 when the arm 11 is in the retracted position, and a storage through hole 93 that is continuous with the positioning through hole 13 when the arm 11 is in the extended position. In fact, it has an overhanging through hole 94 that is continuous with the positioning through hole 13 . When the arm 11 is rotated to the storage position, the positioning through hole 13 and the storage through hole 93 are continuous, so the positioning pin 19 (not shown in FIGS. 4 and 5, see FIG. 10) is inserted into this continuous through hole. ), the arm 11 can be fixed in the storage position. Similarly, when the arm 11 is rotated to the above extended position, the positioning through hole 13 and the overhanging through hole 94 are continuous, so by inserting the positioning pin 19 into this continuous through hole, the arm 11 can be moved. It can be fixed at the above-mentioned extended position.

(Fixing mechanism)
The fixing mechanism 14 includes a through hole 17 that passes through the car body 9, and a fixing pin 18 that is inserted into the through hole 17 and abuts the side edge 11a of the arm 11 from the side.

The through hole 17 can expose the side edge 11a of the arm 11, as shown in FIG. When the arm 11 is placed in an intermediate position between the retracted position and the extended position, that is, when the arm 11 is tilted to the vehicle width direction in a plan view, a part of the side edge 11a of the arm 11 is connected to the through hole 17 in a plan view. overlap. As shown in FIG. 6, a gap 17b is formed in the through hole 17, which is defined by a portion of the side edge 11a and the peripheral edge 17a of the through hole 17.

In this embodiment, the through hole 17 also serves as the storage through hole 93. The present inventors have learned that the side edge 11a of the arm 11 is easily exposed in the storage through hole 93. That is, by using the through hole 17 as the storage through hole 93, the transformer lifter 10 can be easily fixed at a desired intermediate position.

(fixed pin)
As shown in FIGS. 7 and 8, the fixing pin 18 includes a first column portion 18a that fits into the through hole 17, and a second column that extends from the first column portion 18a and abuts the side edge 11a of the arm 11. part 18b, the first displacement prevention plate 18c through which the retaining pin 16 passes when the fixing pin 18 is fitted into the through hole 17, and the first displacement prevention plate 18c through which the retaining pin 16 passes through when the fixing pin 18 is fitted into the through hole 94; A second displacement prevention plate 18d through which the stop pin 16 passes, and a support plate 18e that stands upright on the top surface of the first pillar portion 18a and supports the first displacement prevention plate 18c and the second displacement prevention plate 18d. has.

The cross section of the first pillar part 18a has the same shape and size as the cross section of the through hole 17, and the cross section of the second pillar part 18b has the same shape and size as the cross section of the gap 17b. Further, as shown in FIG. 8, a step 18f is provided at the connection portion between the first column portion 18a and the second column portion 18b. By configuring the fixing pin 18 in this way, the fixing pin 18 fits into both the through hole 17 and the gap 17b, so the transformer lifter 10 can be more reliably fixed at the intermediate position.

It is preferable that the through hole 17 has a circular cross section, and the first column part 18a has a circular cross section. In this case, the gap 17b has a bow shape, and the cross section of the second pillar portion 18b also has a bow shape. For example, when it is desired to increase the angle at which the arm 11 is fixed, the arc of the gap 17b moves toward the center while maintaining its bow shape, and accordingly, the arc portion 18g of the second pillar portion 18b also moves toward the center. (→ in Figure 9). Therefore, if it is desired to change the fixing position, the adjustment can be made by, for example, attaching a plate 18h in accordance with the amount of movement of the arc portion 18g.

As shown in FIG. 8, the first displacement prevention plate 18c has a pin through hole 18i through which the retaining pin 16 passes. The first displacement prevention plate 18c is arranged such that the fixing pin 18 is fitted into the through hole 17 and the retaining pin 16 vertically passes through the first displacement prevention plate 18c (see FIG. 6). For example, when the through hole 17 has a circular cross section, if the fixing pin 18 itself rotates, the transformer lifter 10 may not be sufficiently fixed in the intermediate position. Therefore, by providing the first displacement prevention plate 18c in this manner, the transformer lifter 10 can be more reliably fixed at the intermediate position.

The second displacement prevention plate 18d is configured similarly to the first displacement prevention plate 18c, except that it is arranged at a predetermined angle with the first displacement prevention plate 18c. The predetermined angle is equal to the rotation angle of the arm 11 between the retracted position and the extended position, and is 90 degrees in this embodiment.

The support plate 18e also serves to prevent the fixing pin 18 from coming off. That is, the support plate 18e is longer than the diameter of the first column portion 18a in plan view, and a portion thereof protrudes outward from the first column portion 18a.

When the arm 11 is placed in the storage position, the positioning through hole 13 and the storage through hole 93 are continuous as shown in FIG. 11 at the above-mentioned storage position. When the arm 11 is placed in the storage position, the side edge 11a of the arm 11 is exposed to the overhanging through hole 94, and the fixing pin 18 is preferably configured to be insertable into the overhanging through hole 94. . By configuring the fixing pin 18 so that it can be inserted into the overhanging through hole 94 in the storage position, the fixing pin 18 can be stored during transportation, thereby preventing loss of the fixing pin 18 and increasing work efficiency. be able to.

〔advantage〕
In the lower traveling body 2, the side edge 11a of the arm 11 is exposed in the through hole 17 passing through the car body 9, so the fixing pin 18 is inserted into the gap 17b defined by the side edge 11a of the arm 11 and the through hole 17. Can be inserted. By bringing the fixing pin 18 into contact with the side edge 11a of the arm 11 from the side, the arm 11 can be fixed obliquely to the car body 9 in plan view. In the undercarriage body 2, since the arm 11 is fixed diagonally as described above, no processing is required on the undercarriage body 2 itself. Therefore, the lower traveling body 2 can fix the transformer lifter 10 at an intermediate position without requiring any processing on the lower traveling body 2 itself.

Since the construction machine 1 includes the undercarriage body 2 of the present invention, the transformer lifter 10 can be fixed at an intermediate position without requiring any processing on the undercarriage body 2 itself.

[Other embodiments]
The above embodiments do not limit the configuration of the present invention. Therefore, in the above embodiment, it is possible to omit, replace, or add components of each part of the above embodiment based on the description of this specification and common general technical knowledge, and all of these are interpreted as falling within the scope of the present invention. Should.

In the above embodiment, a construction machine equipped with a boom and a hook has been described as an example, but the construction machine of the present invention is not limited to one equipped with a boom and a hook, and other construction machines can be used as long as they are equipped with the undercarriage body of the present invention. It may be a type of construction machine.

In the above embodiment, a construction machine including a total of four transformer lifters has been described as an example, but the number of transformer lifters is not limited to four. Furthermore, it is not necessary for all transformer lifters to have a fixing mechanism that fixes the arm diagonally with respect to the vehicle width direction in a plan view, and even if some of them have a fixing mechanism, the intention of the present invention does not fall into the scope of the present invention. This is the place to do it. That is, this does not preclude selectively providing a fixing mechanism for a transformer lifter whose arm needs to be fixed diagonally with respect to the vehicle width direction.

In the above embodiment, a case has been described in which the transformer lifter has a central shaft and a retaining pin that fixes the central shaft to the car body. The retaining pin can be omitted.

In the above embodiment, a case has been described in which the through hole also serves as a storage through hole, but the same effect can be obtained even if the through hole also functions as an overhanging through hole. That is, it is preferable that the above-mentioned through-hole serves as either the above-mentioned storage through-hole or the overhanging through-hole. Alternatively, the through hole may also serve as another through hole that can penetrate the car body and expose the side edge of the arm.

In the above embodiment, a case has been described in which the fixing pin has a first displacement prevention plate and a second displacement prevention plate, but a fixation pin that does not have one or both of these plates can also be used. Further, in the above embodiment, the first displacement prevention plate and the second displacement prevention plate are configured such that the retaining pin passes through them, but other members may penetrate or be connected to prevent displacement. Good too. Further, the shape of the fixing pin is not limited to the shape of the above embodiment, and other shapes may be adopted as long as it can be inserted into the through hole and abutted against the side edge of the arm from the side. can.

In the above embodiment, a case has been described in which the lower traveling body has four steps in front and behind the car body, but the number and position of the steps are not limited to this. The present invention also contemplates an undercarriage having no steps.

As described above, the undercarriage body and construction machine of the present invention do not require any processing on the undercarriage body itself, and can fix the transformer lifter at an intermediate position.

1 Construction machine 2 Lower traveling body 3 Upper revolving body 4 Boom 5 Hook 6 Wire rope 7 Operator's cabin 8 Crawler unit 81 Crawler frame 82 Crawler 83 Step 9 Car body 91 Bearing 92 Frame 92a Front frame 92b Rear frame 93 Storage penetration Hole 94 Overhanging through hole 95 Car body weight 10 Transformer lifter 11 Arm 11a Side edge 12 Cylinder 13 Positioning through hole 14 Fixing mechanism 15 Center shaft 16 Stopping pin 17 Through hole 17a Periphery 17b Gap 18 Fixing pin 18a First column part 18b Second pillar portion 18c First displacement prevention plate 18d Second displacement prevention plate 18e Support plate 18f Step 18g Arc portion 18h Plate 18i Pin through hole 19 Locating pin S Space

Claims (6)

a pair of crawler units arranged apart in the vehicle width direction;
A car body to which this crawler unit is removably attached,
Equipped with a transformer lifter for lifting the above car body,
The above transformer lifter is
an arm rotatably attached to the car body;
and a fixing mechanism that fixes the arm diagonally with respect to the vehicle width direction when viewed from above,
The above fixing mechanism is
a through hole that penetrates the car body and can expose a side edge of the arm;
and a fixing pin inserted into the through hole and abutting the side edge from the side. The above fixing pin is
a first pillar portion that fits into the through hole;
a second column extending from the first column and abutting the side edge;
The undercarriage body according to claim 1, wherein a step is provided at a connecting portion between the first column portion and the second column portion. The above transformer lifter is
a central axis that allows the arm to rotate;
and a retaining pin for fixing the center shaft to the car body,
The undercarriage body according to claim 1 or 2, further comprising a displacement prevention plate through which the retaining pin passes in a state where the fixing pin is fitted into the through hole. The arm is configured to be rotatable between a retracted position parallel to the vehicle width direction and an extended position extending in the traveling direction,
The transformer lifter is provided on the arm and has a positioning through hole for fixing the arm to the car body at the retracted position and the extended position,
The above car body is
a storage through hole that is continuous with the positioning through hole when the arm is in the storage position;
an extension through hole that is continuous with the positioning through hole when the arm is in the extended position;
The undercarriage body according to claim 1 or 2, wherein the through hole serves as either the storage through hole or the overhanging through hole. When the arm is in the retracted position, the side edge of the arm is exposed to the extension hole;
The undercarriage body according to claim 4, wherein the fixing pin is configured to be insertable into the projecting through hole. A construction machine comprising the undercarriage according to claim 1 or 2.

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