JP7528992B2 - Undercarriage and construction machinery - Google Patents

Description

The present invention relates to a lower running body and a construction machine.

Some large construction machines have their crawler units removed when transporting them on a trailer, for example. One such construction machine is known to have a total of four translifters, one on each side of the front and rear of the carbody, as a means for lifting the carbody when loading and unloading it onto and from the trailer after the crawler units have been removed (see, for example, JP 2013-23849 A).

The translifter installed on this construction machine has an arm whose base end is attached to the car body and a lift cylinder installed at the tip of the arm. The arm is configured to be rotatable between a storage position parallel to the width direction of the car body and an extension position that extends forward or backward from the car body, and is fixed in the storage position or the extension position as necessary.

Fixation to the storage position or the extension position is performed using a positioning through hole provided in the arm, a storage through hole provided in the car body that is continuous with this through hole at the storage position, and an extension through hole that is continuous with this through hole at the extension position. In other words, since the positioning through hole and the storage through hole are continuous at the storage position, a positioning pin can be inserted into this continuous through hole to fix the arm so that it does not rotate. Similarly, at the extension position, a positioning pin can be inserted into the continuous positioning through hole and extension through hole to fix the arm.

JP 2013-23849 A

In the above conventional construction machine, as shown in FIG. 2, when the translifter 10 is fixed in the extended position, which is the working posture, and assembly or daily maintenance is performed, for example, the space S between the translifter 10 and the crawler unit 8 is sandwiched between the step 83 and the car body 9 on the front and rear, which may make access difficult. In addition, when the above conventional construction machine is lashed to a barge for transportation, the lashing device and the translifter 10 may interfere with each other.

In such a case, it is effective to fix the arm 11 at a position intermediate between the storage position and the extended position, as shown in FIG. 3. Fixing the arm 11 at the intermediate position creates a gap between the translifter 10 and the step 83, and the space S can be easily accessed through this gap. In order to fix the arm 11 at the intermediate position, it is possible to provide an additional intermediate position through hole in the car body 9, for example, but it may not be physically possible to provide an additional through hole, or the strength may be reduced. It is also possible to fix the tip with a wire or the like, but this requires the installation of a part for fixing to the undercarriage of the construction machine. In addition, either method requires processing of the undercarriage, which tends to be labor-intensive and expensive.

The present invention was made based on the above-mentioned circumstances, and aims to provide a lower running body and construction machine that can fix a trans lifter in an intermediate position without requiring processing of the lower running body itself.

The undercarriage according to one aspect of the present invention comprises a pair of crawler units spaced apart in the vehicle width direction, a car body to which the crawler units are detachably attached, and a translifter for lifting the car body, the translifter having an arm rotatably attached to the car body and a fixing mechanism for fixing the arm at an angle to the vehicle width direction in a plan view, the fixing mechanism having a through hole that penetrates the car body and exposes 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 is equipped with a lower running body according to the present invention.

The undercarriage and construction machine of the present invention can fix the translifter in the middle position without requiring processing of the undercarriage itself.

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 the extended position. FIG. 3 shows a state in which the arm in FIG. 2 is fixed to the translifter at an angle. FIG. 4 is a schematic plan view showing an enlarged portion of the car body and the translifter shown in FIG. FIG. 5 is a schematic side view of FIG. FIG. 6 is a schematic plan view showing a state in which the fixing pin is removed from FIG. FIG. 7 is a schematic plan view of the fixing pin shown in FIG. FIG. 8 is a schematic side view of the fixing pin shown in FIG. FIG. 9 is a schematic bottom view of the fixing pin shown in FIG. FIG. 10 is a schematic plan view showing a state in which the arm in FIG. 4 is in the retracted position.

[Description of the embodiments of the present invention]
The inventors have noticed that when the arm of the translifter is rotated, the side edge of the arm is exposed to, for example, the storage through-hole at the intermediate position. Specifically, when the arm rotates below the storage through-hole, a part of the side edge of the arm passes through the storage through-hole in a plan view, and a gap is generated between the part of the side edge and the storage through-hole. The inventors have found that the translifter can be fixed in the intermediate position, i.e., at an angle, by inserting a fixing pin that fits into the gap formed when the arm is in a desired intermediate position, and have completed the present invention.

In other words, the undercarriage according to one aspect of the present invention comprises a pair of crawler units arranged at a distance in the vehicle width direction, a car body to which the crawler units are detachably attached, and a translifter for lifting the car body, the translifter having an arm rotatably attached to the car body and a fixing mechanism for fixing the arm at an angle to the vehicle width direction in a plan view, the fixing mechanism having a through hole that penetrates the car body and exposes 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.

In this lower running body, the side edge of the arm is exposed in a through hole that penetrates the car body, so a fixing pin can be inserted into the gap defined by the side edge of the arm and the through hole. Then, by abutting the fixing pin against the side edge of the arm from the side, the arm can be fixed at an angle to the vehicle width direction in a plan view. In this lower running body, since the arm is fixed at an angle as described above, no processing of the lower running body itself is required. Therefore, the lower running body can fix the trans lifter in the intermediate position without requiring processing of the lower running body itself.

The fixing pin may have a first column portion that fits into the through hole, and a second column portion that extends from the first column portion and abuts against the side edge, and a step may be provided at the connection portion between the first column portion and the second column portion. By configuring the fixing pin in this way, the fixing pin fits into both the through hole and the gap, so that the translifter can be more reliably fixed to the intermediate position.

The translifter may have a central shaft that allows the arm to rotate, a retaining pin that fixes the central shaft to the car body, and a displacement prevention plate through which the retaining pin passes when the fixing pin is fitted into the through hole. By providing the displacement prevention plate in this way, the translifter can be more reliably fixed in the middle position.

The arm is configured to be rotatable between a storage position parallel to the vehicle width direction and an extension position extending in the traveling direction, the trans lifter is provided on the arm and has a positioning through hole for fixing the arm to the car body in the storage position and the extension position, the car body has a storage through hole that is continuous with the positioning through hole when the arm is in the storage position, and an extension through hole that is continuous with the positioning through hole when the arm is in the extension position, and the through hole serves as either the storage through hole or the extension through hole. The inventors have found that the side edge of the arm is easily exposed in the storage through hole and the extension through hole. In other words, by making the through hole either the storage through hole or the extension through hole, the trans lifter can be easily fixed to a desired intermediate position.

When the arm is in the stored position, the side edge of the arm is exposed to the projection through hole, and the fixing pin is preferably configured to be insertable into the projection through hole. By configuring the fixing pin to be insertable into the projection through hole in the stored position in this way, the fixing pin can be stored during transportation, preventing the fixing pin from being lost, and improving work efficiency.

A construction machine according to another aspect of the present invention is equipped with a lower running body according to the present invention.

Since the construction machine is equipped with the undercarriage of the present invention, the translifter can be fixed in the middle position without requiring processing of the undercarriage itself.

Here, "the side edge of the arm is exposed in the through hole" means that when looking into the through hole from the opposite side to the position of the arm in a plan view, the side edge of the arm can be seen inside the through hole.

[Details of the embodiment of the present invention]
Hereinafter, a construction machine and a lower traveling 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 Figure 1 comprises a lower running body 2, an upper rotating body 3 mounted on the lower running body 2 so as to be rotatable horizontally, a boom 4 attached to the upper rotating body 3 so as to be able to rise and fall, a hook 5, and a wire rope 6 that suspends the hook 5 from the tip of the boom 4.

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

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

<BOOM>
The boom 4 is attached to the upper rotating body 3 so as to be able to swing back and forth. The boom 4 has a sheave at its tip for guiding a 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 load.

<Wire rope>
The wire rope 6 is passed through a sheave at the tip of the boom 4 and wound around a winch (not shown) installed on the upper rotating body 3. The winch may be installed on the back side of the boom 4 (the side that is on top when the boom 4 is lowered).

[Lower running body]
The lower traveling body 2 itself is one aspect of the present invention. As shown in Fig. 2, the lower traveling body 2 includes a pair of crawler units 8 arranged at a distance in the vehicle width direction, a car body 9 to which the crawler units 8 are detachably attached, and four translifters 10.

<Crawler unit>
The crawler unit 8 is a traveling device of the lower traveling body 2, and as shown in FIG. 1, has a crawler frame 81 and a crawler 82 disposed on the crawler frame 81.

A step 83 is provided that protrudes from the crawler frame 81 toward the inside in the vehicle width direction, that is, toward the space between the pair of crawler frames 81. The work vehicle can use this step 83 to board the upper rotating body 3.

In the lower traveling body 2, steps 83 are provided at the front and rear of the car body 9 for the pair of crawler frames 81. In other words, the lower traveling body 2 has four steps 83. The translifter 10, which will be described later, is provided rotatably between the car body 9 and the steps 83. In addition, when the translifter 10 is in an extended position parallel to the traveling direction, the distance between the translifter 10 and the steps 83 is set to a minimum (a distance that ensures that the translifter 10 and the steps 83 do not come into contact) so that the upper rotating body 3 can be easily boarded via the steps 83.

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

The frame 92 is composed of 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 translifter 10 is a lifter for lifting the car body 9, and a total of four translifters 10 are provided, one on each side of the front and rear of the car body 9. Note that "left and right" refers to left and right with respect to the forward direction (forward) of the lower traveling body 2.

The trans lifter 10 has an arm 11 that is rotatably attached to the car body 9, a cylinder 12 that is fixed to the tip of the arm 11, a positioning through hole 13 for fixing the arm 11 to the car body 9, and a fixing mechanism 14 that fixes the arm 11 at an angle to the vehicle width direction in a plan view (see Figures 2 to 5). The trans lifter 10 also 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 base end of the arm 11 is attached to the car body 9 via a central shaft 15. The arm 11 is configured to be rotatable between a stored position parallel to the vehicle width direction and a projecting position parallel to the traveling direction. More specifically, a pair of trans lifters 10 provided in front of the car body 9 are configured to project forward of the lower traveling body 2, and a pair of trans lifters 10 provided in the rear of the car body 9 are configured to project rearward of the lower traveling body 2 (opposite to the forward traveling direction).

In this embodiment, the arm 11 rotates 90 degrees between the storage 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 above-mentioned extended position, and enables jacking up the car body 9. The cylinder 12 can be configured, for example, by a hydraulic cylinder including a cylinder body extending downward from the tip of the arm 11 and a rod that can slide up and down relative 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 at 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 storage position, and an extension through hole 94 that is continuous with the positioning through hole 13 when the arm 11 is in the extended position. When the arm 11 is rotated to the storage position, the positioning through hole 13 and the storage through hole 93 are continuous, so that the arm 11 can be fixed to the storage position by inserting a positioning pin 19 (not shown in Figs. 4 and 5, see Fig. 10) into this continuous through hole. Similarly, when the arm 11 is rotated to the extended position, the positioning through hole 13 and the extension through hole 94 are continuous, so that the arm 11 can be fixed to the extended position by inserting a positioning pin 19 into this continuous through hole.

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

As shown in FIG. 6, the through hole 17 can expose the side edge 11a of the arm 11. When the arm 11 is in an intermediate position between the storage position and the extended position, i.e., when the arm 11 is tilted with respect to the vehicle width direction in a plan view, a part of the side edge 11a of the arm 11 overlaps with the through hole 17 in a plan view. Then, as shown in FIG. 6, a gap 17b is generated in the through hole 17, which is defined by a part of the side edge 11a and the periphery 17a of the through hole 17.

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

(Fixed pin)
As shown in Figures 7 and 8, the fixing pin 18 has a first pillar portion 18a that fits into the through hole 17, a second pillar portion 18b that extends from the first pillar portion 18a and abuts the side edge 11a of the arm 11, a first positional deviation prevention plate 18c through which the anti-slip pin 16 passes when the fixing pin 18 is fitted into the through hole 17, a second positional deviation prevention plate 18d through which the anti-slip pin 16 passes when the fixing pin 18 is inserted into the extension through hole 94, and a support plate 18e that is erected on the top surface of the first pillar portion 18a and supports the first positional deviation prevention plate 18c and the second positional deviation prevention plate 18d.

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

It is preferable that the cross section of the through hole 17 is circular and that the cross section of the first columnar portion 18a is also circular. In this case, the gap 17b is arched, and the cross section of the second columnar portion 18b is also arched. For example, if you want to increase the angle at which the arm 11 is fixed, the gap 17b maintains its arched shape while the arc moves toward the center, and the arc portion 18g of the second columnar portion 18b also moves toward the center accordingly (→ in Figure 9). Therefore, if you want to change the fixing position, you can adjust it by, for example, attaching a plate 18h to correspond to the amount of movement of the arc portion 18g.

As shown in FIG. 8, the first misalignment prevention plate 18c has a pin through hole 18i through which the anti-slip pin 16 passes. The first misalignment prevention plate 18c is arranged so that the anti-slip pin 16 passes vertically through it when the fixing pin 18 is fitted into the through hole 17 (see FIG. 6). For example, if the cross section of the through hole 17 is circular, there may be cases where the transformer lifter 10 cannot be sufficiently fixed in the intermediate position if the fixing pin 18 itself rotates. Therefore, by providing the first misalignment prevention plate 18c in this manner, the transformer lifter 10 can be more reliably fixed in the intermediate position.

The second displacement prevention plate 18d is configured similarly to the first displacement prevention plate 18c, except that it is disposed at a predetermined angle to 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, which is 90 degrees in this embodiment.

The support plate 18e also serves to prevent the fixing pin 18 from falling out. In other words, the support plate 18e is longer than the diameter of the first column portion 18a in a plan view, and a portion of the support plate 18e protrudes outward from the first column portion 18a.

When the arm 11 is in the storage position, as shown in FIG. 10, the positioning through hole 13 and the storage through hole 93 are connected, and the positioning pin 19 is inserted into this connected through hole to fix the arm 11 in the storage position. When the arm 11 is in the storage position, the side edge 11a of the arm 11 is exposed in the extension through hole 94, and it is preferable that the fixing pin 18 can be inserted into the extension through hole 94. By configuring the fixing pin 18 to be insertable into the extension through hole 94 in this way in the storage position, the fixing pin 18 can be stored during transportation, which prevents the fixing pin 18 from being lost and improves work efficiency.

〔advantage〕
In the lower running body 2, the side edge 11a of the arm 11 is exposed in the through hole 17 penetrating the car body 9, so that the fixing pin 18 can be inserted into the gap 17b defined by the side edge 11a of the arm 11 and the through hole 17. Then, by abutting the fixing pin 18 against the side edge 11a of the arm 11 from the side, the arm 11 can be fixed obliquely to the car body 9 in a plan view. In the lower running body 2, since the arm 11 is fixed obliquely as described above, no processing is required on the lower running body 2 itself. Therefore, the lower running body 2 can fix the translifter 10 at the intermediate position without requiring processing on the lower running body 2 itself.

The construction machine 1 is equipped with the undercarriage 2 of the present invention, so the translifter 10 can be fixed in the middle position without the need for processing the undercarriage 2 itself.

[Other embodiments]
The above-mentioned embodiment does not limit the configuration of the present invention. Therefore, the above-mentioned embodiment may omit, replace or add components of each part of the above-mentioned embodiment based on the description in this specification and common technical knowledge, and it should be construed that all of these are within the scope of the present invention.

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 may be another type of construction machine as long as it is equipped with the undercarriage of the present invention.

In the above embodiment, a construction machine equipped with a total of four translifters has been described as an example, but the number of translifters is not limited to four. In addition, it is not necessary for all translifters to have a fixing mechanism that fixes the arm at an angle to the vehicle width direction in a plan view, and it is within the intention of the present invention even if only some of them have a fixing mechanism. In other words, there is nothing to prevent selectively providing a fixing mechanism to a translifter that needs to fix the arm at an angle to the vehicle width direction.

In the above embodiment, the translifter has a central shaft and a locking pin that fixes the central shaft to the car body. However, for example, if the central shaft is configured so that it cannot be inserted or removed, the locking pin can be omitted.

In the above embodiment, the through hole is described as also serving as a storage through hole, but the same effect can be achieved if the through hole also serves as an extension through hole. In other words, the through hole may serve as either the storage through hole or the extension through hole. Alternatively, the through hole may also serve as another through hole that penetrates the car body and can expose the side edge of the arm.

In the above embodiment, the fixing pin has a first misalignment prevention plate and a second misalignment prevention plate, but a fixing pin that does not have one or both of these may also be used. In addition, in the above embodiment, a configuration in which a retaining pin passes through the first misalignment prevention plate and the second misalignment prevention plate is shown, but misalignment may be prevented by passing through or being connected to another member. Furthermore, the shape of the fixing pin is not limited to the shape in the above embodiment, and other shapes may be adopted as long as it can be inserted into the through hole and abut against the side edge of the arm from the side.

In the above embodiment, the lower running body has four steps at the front and rear of the car body, but the number and position of the steps are not limited to this. In addition, the present invention also contemplates a lower running body that does not have steps.

As described above, the undercarriage and construction machine of the present invention can fix the translifter in the middle position without requiring processing of the undercarriage itself.

REFERENCE SIGNS LIST 1 Construction machine 2 Lower travelling 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 through hole 94 Extension through hole 95 Car body weight 10 Trans lifter 11 Arm 11a Side edge 12 Cylinder 13 Positioning through hole 14 Fixing mechanism 15 Central shaft 16 Anti-pullout pin 17 Through hole 17a Periphery 17b Gap 18 Fixing pin 18a First pillar portion 18b Second pillar portion 18c First positional deviation prevention plate 18d Second positional deviation prevention plate 18e Support plate 18f Step 18g Arc portion 18h Plate 18i Pin through hole 19 Positioning pin S Space

Claims (6)

A pair of crawler units disposed apart in a vehicle width direction;
a car body to which the crawler unit is detachably attached;
a transformer lifter for lifting the car body,
The above-mentioned transformer lifter is
an arm rotatably attached to the car body;
and a fixing mechanism that fixes the arm at an angle with respect to the vehicle width direction in a plan view,
The fixing mechanism is
a through hole penetrating the car body and capable of exposing a side edge of the arm;
a fixing pin that is inserted into the through hole and abuts against the side edge from the side; The fixing pin is
A first pillar portion that fits into the through hole;
A second column portion extending from the first column portion and abutting against the side edge,
The lower traveling body according to claim 1 , wherein a step is provided at a connection portion between the first column portion and the second column portion. The above-mentioned transformer lifter is
A central shaft that allows the arm to rotate;
and a retaining pin for fixing the central shaft to the car body.
3. The lower traveling body according to claim 1, further comprising a displacement prevention plate through which the retaining pin passes when the fixing pin is fitted in the through hole. The arm is configured to be rotatable between a stored position parallel to the vehicle width direction and a protruding position protruding in the traveling direction,
the translifter is provided on the arm and has a positioning through hole for fixing the arm to the car body at the stored position and the extended position;
The above car body,
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 extension position,
3. The undercarriage according to claim 1, wherein the through hole serves as either the storage through hole or the extension through hole. When the arm is in the stored position, a side edge of the arm is exposed to the projection through hole,
The lower traveling body according to claim 4, wherein the fixing pin is configured to be insertable into the extension through hole. A construction machine comprising the undercarriage according to claim 1 or 2.

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