JP3746971B2 - Side frame connecting device for construction machinery - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a side frame connecting device for a construction machine such as a hydraulic excavator.
[0002]
[Prior art]
Conventionally, for construction machines such as hydraulic excavators that run by rotating the crawler belt, the distance between the side frames is reduced during transportation to facilitate transportation, and the distance between the side frames is increased during work to stabilize the work. There is something that is designed to be illustrated.
In addition, in the construction machine that can adjust the distance between the side frames, the left and right side frames are movably connected to the center frame installed on the left and right side frames. As such a side frame connecting device, For example, what is described in JP-A-6-88355 is known.
[0003]
In the side frame connecting device disclosed in the above publication, a plurality of pairs of cylindrical spacers are provided on the upper surface of the side frame with a space in the front-rear direction, and the guide surface formed inside the outer portion of the center frame is slidably contacted by these spacers. In order to prevent the spacer from biting into the guide surface when the side frame is extended and contracted, a guide cylinder shorter than the spacer is rotatably provided on the outer peripheral surface of the spacer.
[0004]
In the conventional side frame connecting device, when extending the side frame of the construction machine carried into the work site in a state where the side frame is contracted, firstly loosen the fixing tool that fixes the side frame, After grounding to the side of the side frame, with the wire connected between the extending side frame and the work implement, jack up the extending side frame with the work implement and pull the side frame with the work implement to move in the extending direction. I am letting.
[0005]
[Problems to be solved by the invention]
However, as described in the above publication, the work of jacking up the side frame by the work machine and simultaneously shifting the grounded work machine in the direction of separating from the vehicle body requires skill and is dangerous to the work. Since the work of connecting and disconnecting the frame and the work machine with wires is required, there is a problem that work takes time and work efficiency is poor.
[0006]
The present invention has been made in order to improve such a conventional problem, and an object of the present invention is to provide a side frame connecting device for a construction machine in which a side frame can be expanded and contracted safely in a short time.
[0007]
[Means for Solving the Problems]
To achieve the above object, a side frame connecting device for a construction machine according to the present invention is a side frame connecting device for a construction machine in which side frames are connected to both sides of a center frame so as to be extendable in the vehicle width direction. Guide means for guiding the expansion and contraction of the side frame is provided at the connecting portion of the side frame, and when the side frame is extended, the guide means is located outside the center of gravity of the side frame, and when the side frame is reduced, the guide means is provided on the side frame. It is attached inside the center of gravity.
[0008]
With the above configuration, when the side frame fixed at the contracting position for transportation of the construction machine is extended during work, or when the side frame fixed at the work extension position is contracted during transport, the guide means is located outside the center of gravity of the side frame. By attaching to the inside and jacking up the side frame with the work machine, the side frame expands to the outside due to the weight of the side frame or shrinks to the inside. It is not necessary to tow or to move the work machine while jacking up the side frame with the work machine, so that the side frame can be expanded and contracted in a short time and safely.
[0009]
In order to achieve the above-mentioned object, the side frame connecting device for a construction machine according to the present invention comprises a cylindrical spacer that abuts against guide surfaces formed on both sides of the center frame, and a center frame when the side frame expands and contracts. And a set bolt for selectively fixing the spacer and the seat plate outside and inside the center of gravity of the side frame.
[0010]
With the above configuration, the side frame can be expanded and contracted simply by attaching the spacer and the seat plate to the outside of the center of gravity of the side frame with the set bolt, so that the work efficiency is very good and the spacer is guided on the guide surface of the center frame. Since the side frame is moved, the side frame can be expanded and contracted smoothly.
Further, since the guide means can be configured with a small number of parts such as a spacer, a seat plate and a set bolt, it can be provided at low cost.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described in detail with reference to the drawings.
1 is a side view of a construction machine (hydraulic excavator), FIG. 2 is an exploded perspective view of a lower traveling body, FIG. 3 is a sectional view of the assembled state, FIG. 4 is an arrow view from the direction A in FIG. FIG. 8 is an explanatory diagram of operation.
A construction machine 1 shown in FIG. 1 is composed of a self-propelled lower traveling body 2 and an upper revolving body 3 provided on the lower traveling body 2 so as to be able to swivel. A cab 5 and the like are provided.
[0012]
As shown in FIG. 2, the lower traveling body 3 includes a pair of side frames 6 that are separated from each other in the left and right direction and parallel to each other, and a center frame 7 that is installed on the side frames 6. Is connected to be extendable in the vehicle width direction.
An idler wheel 9 is provided at the front part of the side frame 6, and an activation wheel 10 that is rotationally driven by a travel motor (not shown) is provided at the rear part. An endless crawler belt is provided between the idler wheel 9 and the activation wheel 10. 11 is equipped, and the lower traveling body 2 can be self-propelled by rotating the crawler belt 11 via the starting wheel 10 by a traveling motor.
[0013]
On the other hand, at the connecting portion between the side frame 6 and the center frame 7, for example, two flat mounting seats 6a that are separated from each other in the front-rear direction are formed on the side frame 6, and the leg portions of the center frame 7 are attached to these mounting seats 6a. 7a is slidably contacted from above.
The center frame 7 is formed in a substantially plane H shape with legs 7a projecting from the front and back of both sides, and a turning means 8 for rotatably supporting the upper turning body 3 is installed at the center.
[0014]
Further, the leg portions 7a projecting on both side portions are provided between an upper surface plate 7b whose tip side is inclined downward and a lower surface plate 7c and upper and lower surface plates 7b, 7c provided substantially horizontally below the upper surface plate 7b. A plurality of reinforcing ribs 7e project in the vertical direction on the outer surface of the side plate 7d, and a plurality of mounting holes 7f are formed in the periphery of the lower plate 7c. Yes.
These attachment holes 7f are used to insert fixing tools 12 such as bolts for fixing the side frames 6 into the leg portions 7a of the center frame 7. The attachment holes 6f of the side frames 6 are aligned with the respective attachment holes 7f. A plurality of screw holes 6b are formed at positions, and the side frame 6 can be fixed to the leg portions 7a of the center frame 7 by screwing the fixing tool 12 into these screw holes 6b.
[0015]
On the other hand, a guide surface 7g is formed on the inner edge in the front-rear direction of the lower surface plate 7c forming the leg portion 7a of the center frame 7 by cutting out into a concave shape.
These guide surfaces 7g are formed so as to be orthogonal to the front-rear direction of the side frame 6, and the outer peripheral surface of the spacer 14a constituting the guide means 14 is in contact with each guide surface 7g.
The guide means 14 guides the side frame 6 when the side frame 6 extends outward or contracts inward, and includes a cylindrical spacer 14a, an oval seat plate 14b, and a set bolt 14c. The set bolt 14c inserted into the spacer 14a from the bolt hole 14d opened in the seat plate 14b is screwed into the screw holes 14e and 14f drilled in the mounting seat 6a of the side frame 6, thereby mounting. The spacer 14a can be fixed to the seat 6a.
Further, as shown in FIG. 3, the screw holes 14e and 14f drilled in the mounting seat 6a are arranged such that the screw hole 14e is arranged outside the perpendicular line O passing through the center of gravity G of the side frame 6, and the screw hole 14f is arranged inside. It is.
[0016]
Next, the operation of the side frame connecting apparatus configured as described above will be described.
Normally, the construction machine 1 such as a hydraulic excavator is transported using a transport vehicle such as a truck when moving on the work site. However, in the case of a medium-sized or larger construction vehicle, the vehicle width exceeds the transport limit. By moving (reducing) 6 inward, the vehicle is transported so that the vehicle width does not exceed the transport limit.
For this reason, in the work site, the work of extending the side frame 6 of the transported construction machine 1 outward is performed as follows.
[0017]
First, all the fixing members 12 fixing the side frames 6 to the legs 7a of the center frame 7 are removed, and the set bolts 14c into which the seat plates 14b and the spacers 14a are inserted are shown in FIG. The spacer 14a is fixed to the mounting seat 6a of the side frame 6 by screwing into a screw hole 14e formed outside G.
The spacer 14a and the seat plate 14b may be attached to the mounting seat 6a in advance by a set bolt 14c.
[0018]
When the spacer 14a is attached to the mounting seat 6a as described above, the guide surface 7g formed on the lower surface plate 7c comes into contact with the outer peripheral surface of the spacer 14a, and the spacer 14a is formed longer than the thickness of the lower surface plate 7c. Therefore, a gap is generated between the upper surface of the lower surface plate 7c and the lower surface of the seat plate 14b protruding above the lower surface plate 7c.
Next, in this state, when the tip (bucket) of the working machine 4 provided on the upper swing body 3 is grounded to the side of the side frame 6 and the side frame 6 is lifted as shown in FIG. Since the support point (set bolt 14c) is outside the center of gravity G of the side frame 6, the side frame 6 rotates in the direction of arrow B so that the upper surface side is inclined inward and the lower surface side is inclined outward due to the weight of the side frame 6. Moved.
When the side frame 6 is gently lowered from this state, the inner end of the crawler belt 11 is first grounded as shown in FIG. 6, and when the side frame 6 is further lowered, the side frame 6 is rotated in the direction of arrow D with the ground point C as a fulcrum. Therefore, the side frame 6 is moved outward while the spacer 14a is guided by the guide surface 7g formed on the lower surface plate 7c of the center frame 7.
[0019]
If the side frame 6 is not extended to the predetermined position by one operation, the above operation is repeated until the side frame 6 is extended to the predetermined position. The side frame 6 reaches the predetermined position, and the mounting hole 7f on the center frame 7 side. When the screw hole 6b on the side frame 6 side is matched, the fixing tool 12 inserted into the mounting hole 7f is screwed into the screw hole 6b, and the side frame 6 is fixed to the leg portion 7a of the center frame 7. When the extension work of the side frame 6 is completed, the same operation is repeated to perform the extension work of the opposite side frame 6 to connect or disconnect the conventional side frame 6 and the work machine 4 with wires. Also, the side frame 6 can be extended without jacking up the side frame 6 with the work machine 4 and without moving the work machine 4 or the like. It will be safe in a short time.
[0020]
On the other hand, when the work is completed and the construction machine 1 is transported to the next site, the fixing bolt that fixes the side frame 6 to the center frame 7 is removed, and the set bolt 14c into which the seat plate 14b and the spacer 14a are inserted. Is attached to the inner side of the center of gravity G of the side frame 6 as shown in FIG.
Next, when the side frame 6 is jacked up by the work machine 4 in the same manner as in the extension state, the support point (set bolt 14c) of the side frame 6 is inside the center of gravity G of the side frame 6. Due to its own weight, the side frame 6 is rotated in the direction of arrow E so that the upper surface side is inclined inward and the lower surface side is inclined outward.
Then, when the side frame 6 is gently lowered from this state, the outer end of the crawler belt 11 is first grounded as shown in FIG. 8, and when the side frame 6 is further lowered, the side frame 6 rotates in the direction of the arrow H with the ground point F as a fulcrum. Therefore, the side frame 6 is moved inward while the spacer 14a is guided by the guide surface 7g formed on the lower surface plate 7c of the center frame 7.
[0021]
If the side frame 6 is not reduced to the predetermined position by one operation, the above operation is repeated until the side frame 6 is reduced to the predetermined position. The side frame 6 reaches the predetermined position and the mounting hole 7f on the center frame 7 side. When the screw hole 6b on the side frame 6 side is matched, the fixing tool 12 inserted into the mounting hole 7f is screwed into the screw hole 6b to fix the side frame 6 to the leg portion 7a of the center frame 7, and to When the extension operation of the frame 6 is completed, the same operation is repeated to reduce the side frame 6 on the opposite side, and the reduction operation of the side frame 6 can be performed in a short time and safely.
In the above embodiment, the guide surface 7g is formed on the inner edge of the leg 7a. However, the guide surface 7g may be formed on the outer edge of the leg 7a.
[0022]
【The invention's effect】
As described in detail above, the present invention provides guide means for guiding expansion and contraction of the side frame at the connecting portion between the center frame and the side frame, and when the side frame is extended, the guide means is outside the center of gravity of the side frame. In addition, when the side frame is reduced, the guide means is attached to the inside of the center of gravity of the side frame, so that the side frame fixed at the reduced position during transportation of the construction machine is extended during work or fixed at the extended position during work. When shrinking the side frame during transportation, attach the guide means outside or inside the center of gravity of the side frame, jack up the side frame with the work machine, and the side frame will extend outward due to the weight of the side frame, Or, to reduce inward, attach wires to the side frames and check with the work machine. Or, because work such as a side frame shifting the working machine with the jack-up is not required by the working machine, stretch work of the side frame is a short period of time, yet will allow safely.
[0023]
The guide means includes a cylindrical spacer that contacts the guide surfaces formed on both sides of the center frame, a seat plate that engages the center frame when the side frame is expanded and contracted, and the spacer and the seat plate are connected to the center of gravity of the side frame. Since it is composed of set bolts that are selectively fixed to the outside and inside, the side frames can be expanded and contracted simply by attaching the spacer and seat plate to the outside or inside of the center of gravity of the side frame. The efficiency is very good, and the spacer is guided by the guide surface of the center frame and the side frame moves, so that the side frame can be expanded and contracted smoothly, and the guide means with a small number of parts such as the spacer, seat plate and set bolt. Can be provided at low cost.
[Brief description of the drawings]
FIG. 1 is a side view of a construction machine employing a side frame connecting device according to an embodiment of the present invention.
FIG. 2 is an exploded perspective view showing a lower traveling body of a construction machine employing a side frame connecting device according to an embodiment of the present invention.
FIG. 3 is a cross-sectional view showing a lower traveling body of a construction machine employing a side frame connecting device according to an embodiment of the present invention.
4 is a view as seen from the direction of arrow A in FIG. 3;
FIG. 5 is an operation explanatory view of the side frame connecting device for the construction machine according to the embodiment of the present invention.
FIG. 6 is an operation explanatory view of the side frame connecting device for the construction machine according to the embodiment of the present invention.
FIG. 7 is an operation explanatory view of the side frame connecting device for the construction machine according to the embodiment of the present invention.
FIG. 8 is an operation explanatory view of the side frame connecting device for the construction machine according to the embodiment of the present invention.
[Explanation of symbols]
6 Side frame 7 Center frame 7g Guide surface 14 Guide means 14a Spacer 14b Seat plate 14c Set bolt G Center of gravity

Claims (2)

A side frame connecting device for a construction machine in which side frames are connected to both sides of a center frame so as to be extendable in the vehicle width direction, and guide means for guiding expansion and contraction of the side frame to a connecting portion between the center frame and the side frame. The guide means is attached outside the center of gravity of the side frame when the side frame is extended, and the guide means is attached inside the center of gravity of the side frame when the side frame is contracted. Machine side frame connecting device. The guide means includes a cylindrical spacer that abuts against guide surfaces formed on both sides of the center frame, a seat plate that engages with the center frame when the side frame expands and contracts, and the spacer and the seat plate. The side frame connecting device for a construction machine according to claim 1, further comprising a set bolt that is selectively fixed outside and inside the center of gravity of the side frame.

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