JPH07315258A - Track frame for crawler vehicle - Google Patents

Abstract

PURPOSE:To increase the safety in transportation by retracting the overall width of a track frame remarkably when side frames are positioned at the retracted position. CONSTITUTION:A center frame 32 is connected to side frames 33A and 33B through connecting mechanism parts 35A and 35B comprising a slide bracket 41 and a link 49, and the slide bracket 41 is slid in the longitudinal direction of the side frames 33A and 33B so as to position the side frames 33A and 33B selectively between the retracted and extended positions. By this, with the link 49 extended in longitudinal direction along the side frames 33A and 33B, the side frames 33A and 33B can be positioned at the retracted position. Thus the overall width of a track frame 31 can be retracted remarkably, and the safety in transportation is increased remarkably.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a track frame which constitutes an undercarriage of a tracked vehicle having crawler tracks such as a crawler crane and a hydraulic excavator.

[0002]

2. Description of the Related Art Construction machines such as a crawler crane used for construction work for carrying materials to high places and a hydraulic excavator for excavation of earth and sand are required for traveling on an unleveled road surface. It has an undercarriage with tracked tracks.

Therefore, FIGS. 7 to 10 show a crawler crane as an example of a tracked vehicle according to the prior art.

In the figure, 1 is a crawler crane as a tracked vehicle, and the crawler crane 1 includes a lower traveling body 2 and
An upper revolving structure 3 rotatably provided on the lower traveling structure 2.
And a working device 6 provided on the upper swing body 3 and provided with a boom 4, a hook 5 and the like.

Here, the upper revolving superstructure 3 includes a driver's cab 3A,
It has a machine room 3B provided on the rear side of the operator's cab 3A and a counterweight 3C provided on the rear side of the machine room 3B. The undercarriage 2 has a track frame 7, drive wheels 8, idle wheels 9, crawler belts 10 and the like, which will be described later.

Reference numeral 7 denotes a track frame which constitutes the main body of the lower traveling body 2, and the track frame includes a center frame 11 and a center frame 1 as shown in FIG.
It has a pair of side frames 12A, 12B arranged on both sides of the No. 1 and extending in the front-rear direction.

A large-diameter cylindrical round cylinder 13 for supporting the upper revolving structure 3 in a rotatable manner is provided above the center portion of the center frame 11. Further, on the right side and the left side of the center frame 11, a pair of leg portions 14A, 14A and 14B, which are spaced apart from each other by a predetermined distance, are provided.
14B and 14B are provided so as to project laterally.

On the other hand, the side frames 12A and 12B are provided with leg portions 14A, which are projected from the center frame 11,
14B is inserted into the insertion portions 15A, 15A and 15B,
15B is formed, and the side frames 12A and 12B are supported with respect to the center frame 11 by inserting the leg portions 14A and 14B into the insertion portions 15A and 15B.

, 16 are side frames 12A,
12B shows a reinforcing plate located on the upper surface side of 12B so as to straddle the respective insertion portions 15A and 15B, and the periphery of the respective insertion portions 15A and 15B in the side frames 12A and 12B is reinforced by the respective reinforcement plates 16. ing.

, 17, are side frames 12A,
The crawler belt guides, which are provided on the upper surface side of 12B and are formed of a pair of plate-shaped members facing each other with a predetermined gap therebetween, ensure that the track of the crawler belt 10 is secured by the respective crawler belt guides 17.

Reference numerals 18 and 18 denote expansion and contraction cylinders as hydraulic cylinders provided between the center frame 11 and the side frames 12A and 12B.
8 is a tube 19 connected to the center frame 11.
And a piston rod 20 having one end inserted into the tube 19 and the other end connected to the side frames 12A and 12B. Then, each telescopic cylinder 18
Expands the piston rod 20 to move the side frames 12A, 12B to a position (extended position) overhanging the center frame 11, and the piston rod 2
By reducing 0, the side frames 12A, 1
2B is moved to a position close to the center frame 11 (reduction position). In FIG. 8, the side frame 12
A shows the state in which the side frame 12B is in the projecting position and the side frame 12B is in the contracted position.

21A and 21A are positioning mechanisms provided near the leg portions 14A of the center frame 11,
Reference numerals B and 21B denote positioning mechanisms provided in the vicinity of the leg portions 14B of the center frame 11, and the positioning mechanisms 21A and 21B reduce the positions of the side frames 12A and 12B with respect to the center frame 11 to the overhang position and the contraction position. It is designed to position and position.

Since the positioning mechanisms 21A and 21B have the same structure, the positioning mechanism 21 will be described below.
The configuration of A will be described with reference to FIGS. 9 and 10, and the description of the positioning mechanism 21B will be omitted.

That is, the positioning mechanism 21A includes a center side bracket 22 provided in the center frame 11 and having a pin insertion hole 22a formed therein and a side bracket 23 provided in the side frame 12A and having a pin insertion hole 23a formed therein. And a plate-shaped link 24 interposed between the center-side bracket 22 and the side-side bracket 23.

Here, the pin hole 2 is provided at one end of the link 24.
4a is provided, and positioning pin holes 24b, 2 are provided on the other end side.
4c is provided, and the positioning pin hole 24c is the pin hole 24a.
And the positioning pin hole 24b. One end of the link 24 is connected to the side bracket 23 via the pin insertion hole 23a and the connection pin 25 inserted in the pin hole 24a.

On the other hand, the other end of the link 24 has a pin insertion hole 22 when the side frame 12A is in the extended position.
It is connected to the center side bracket 22 via the positioning pin 26 inserted through a and the positioning pin hole 24b (see FIG. 9). As a result, as shown in FIG. 8, the side frame 12A is separated from the center of the center frame 11 by the distance L.
The side frame 12B is positioned at the bulging position separated by 1, and the side frame 12B is also positioned at the bulging position.

When the side frame 12A is in the contracted position, the other end side of the link 24 has the pin insertion hole 22.
It is connected to the center side bracket 22 via the positioning pin 26 that is inserted through the a and the positioning pin hole 24c (see FIG. 10). As a result, the side frame 12A is positioned at the contracted position close to the center frame 11, and similarly, the side frame 12B is also positioned at the contracted position where the distance from the center of the center frame 11 is L2 as shown in FIG. To be done.

In this way, for example, when the crawler crane 1 is being operated, the side frames 12A and 12B are set to the projecting position before the lifting work and the like by jacking up the track frame 7 with a hydraulic jack (not shown). By positioning and widening the distance between the side frames 12A and 12B, it is possible to ensure the stability of lifting work and the like.

For example, when the crawler crane 1 is loaded on a trailer vehicle (not shown) or the like and transported to a work site or the like, the side frames 12A and 12B are reduced to the reduced positions while the track frame 7 is jacked up again. By positioning the side frames 12A and 12B at a narrower position and narrowing the distance between the side frames 12A and 12B, it is possible to ensure transportability and safety during transportation.

[0020]

However, in the prior art as described above, the center frame 11 is provided with the right and left leg portions 14A and 14B, which are spaced apart from each other in the front and rear, and the leg portion 1
4A and 14B are slidably inserted into the insertion portions 15A and 15B of the side frames 12A and 12B, and brackets 22 and 23 and a link 24 are provided between the center frame 11 and the side frames 12A and 12B. Since the positioning mechanisms 21A and 21B are provided, there is a problem that the entire structure becomes complicated, the number of parts increases, and workability at the time of assembly is poor.

The length of protrusion of each leg 14A, 14B from the center frame 11 is determined by the side frames 12A, 1
When the 2B is positioned at the projecting position, each leg 14A, 1
4B is set to a length (indicated by L3 in FIG. 8) for sure insertion into each of the insertion portions 15A and 15B. Therefore, during transportation, the side frames 12A and 12B are moved to the projecting position (the distance L1 from the center of the center frame 11) during the work.
From the position spaced apart only) (reduction position (center frame 1
To a position separated from the center of 1 by a distance L2),
Even if the distance between the side frames 12A and 12B is reduced, the projecting length L3 of each leg portion 14A, 14B cannot be reduced, so that the entire width of the track frame 7 cannot be sufficiently narrowed, and the crawler crane 1 is not easily transported. There is a problem that the transportability becomes poor and the safety is impaired when traveling on a narrow road.

The present invention has been made in view of the above-mentioned problems of the prior art, and it is possible to simplify the entire structure, improve workability during assembly, and improve transportability and safety during transportation. An object of the present invention is to provide a track frame of a tracked vehicle.

[0023]

In order to solve the above-mentioned problems, a track frame of a tracked vehicle according to the present invention is provided with a center frame and left and right sides of the center frame and extended in the front-rear direction. The pair of side frames and a connecting mechanism that connects the side frames to the center frame so as to extend to the left and right.

In the track frame of the tracked vehicle according to the first aspect of the present invention, the connecting mechanism is provided on each of the side frames separately from each other in the front and rear directions and slides in the front-rear direction of the side frames respectively. Slide brackets, front and rear links positioned at the left and right with the tip side rotatably connected to each slide bracket and the base end side rotatably connected to the center frame, and each side. Positioning provided between the frame and each sliding bracket to selectively position each of the sliding brackets in a contracted position in which the side frame is close to the center frame and an extended position in which the side frame extends from the center frame. It is characterized in that it is configured by means.

Further, as in the track frame of the tracked vehicle according to claim 2, the front and rear sliding brackets are:
When the side frames are in the extended position, they approach each other to extend the front and rear links in a parallel state, and when the side frames are in the contracted position, the side frames are separated from each other, so that the front and rear links are separated from each other. It is desirable that the link be extended in the front-rear direction along the side frame.

Further, as described in claim 3, a pair of left and right hydraulic cylinders are provided between the center frame and each side frame, and each hydraulic cylinder extends each side frame when extended. It is possible to adopt a configuration in which each side frame is set to the reduced position when the position is reduced.

[0027]

According to the first aspect of the present invention, each link is provided between each side frame and each sliding bracket, and the positioning means for positioning each sliding bracket with respect to each side frame is installed. At the time of working on a tracked vehicle, each side frame is positioned at a projecting position where it projects from the center frame. Further, when the tracked vehicle is transported, each side frame is positioned at a contracted position in the vicinity of the center frame, so that the entire width of the tracked vehicle can be reduced.

According to the second aspect of the present invention, when each side frame is selectively positioned between the extended position and the contracted position, each sliding bracket approaches or separates in the front-back direction of each side frame. The front and rear links are housed in a state where they extend in parallel with each side frame as the sliding brackets move, so when the side frames are positioned in the contracted position, Link does not project to the left and right of each side frame,
The overall width of the tracked vehicle can be effectively reduced.

Further, according to the invention of claim 3, the side frames can be easily positioned by moving the side frames between the extended position and the contracted position by the hydraulic cylinder.

[0030]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS. In the embodiment, the same components as those of the prior art shown in FIGS. 7 to 10 described above are designated by the same reference numerals, and the description thereof will be omitted.

In the figure, 31 indicates a track frame according to the present embodiment, the track frame 31 includes a center frame 32 and a pair of side frames 33A and 33B arranged on the right and left sides of the center frame 32, respectively.
The side frames 33A and 33B are attached to the center frame 3
2 and a connecting mechanism 35 which will be described later.

Here, support brackets 34, 34, ... Having pin insertion holes 34a are provided at four positions on the front, rear, right, and left of the center frame 32, and the respective support brackets are provided. 34 and the side frame 33A,
The connection mechanism portions 35A and 35B that form the connection mechanism 35 are provided between the connection mechanism 33B and 33B. In addition, the connection mechanism part 3
Since 5A and 35B have the same configuration,
Only the configuration of the coupling mechanism portion 35A will be described, and the same components in the coupling mechanism portion 35B as those in the coupling mechanism portion 35A will be denoted by the same reference numerals and description thereof will be omitted.

36, 36 are in front of the side frame 33A,
The sliding portions formed afterwards are separated from each other,
A bottom plate 38 disposed on the lower plate 33a of the side frame 33A via a pair of spacers 37, 37, and the bottom plate 38.
A high-rigidity box composed of a front wall 39 erected on the front end side of the rear wall, a rear wall 40 erected on the rear end side of the bottom plate 38 facing the front wall 39, and an upper plate 33b of the side frame 33A. It is formed into a shape.

A long groove 38a extending in the longitudinal direction is formed in the bottom plate 38, and a reduction positioning hole 38b and an extension positioning hole 38c are formed near both ends of the long groove 38a.

41, 41 are arranged in each sliding portion 36,
The sliding brackets before and after sliding in the front-back direction of the side frame 33A are shown. Each sliding bracket 41 includes a lower plate portion 42, an upper plate portion 43, side plate portions 44 facing each other,
45 and a hollow box shape. The lower plate portion 42 and the upper plate portion 43 are provided on one end side of the sliding bracket 41.
A connecting pin hole 41a penetrating through and is formed. In addition, a positioning pin hole 42a into which a positioning pin 48 described later is inserted is formed on the other end side of the lower plate portion 42, and a sliding position described later is inserted between the connecting pin hole 41a and the positioning pin hole 42a. A sliding pin hole 42b into which the pin 46 is inserted is formed.

Of the sliding brackets 41, the front sliding bracket 41 has a front side plate portion 45 longer than the rear side plate portion 44 as shown in FIG. The rotation range of is regulated to about 90 degrees.
When the link 49 is rotated linearly with respect to the sliding bracket 41 as shown in FIG.
The side plate portion 45 on the front side comes into contact with the link 49 so that the link 49
Restricts further rotation of the. Further, in the rear side sliding bracket 41, the rotation range of the link 49 is restricted to about 90 degrees by the rear side plate portion 44.

Reference numeral 46 denotes a sliding pin inserted into a sliding pin hole 42b formed in the lower plate portion 42 of the sliding bracket 41,
The lower end side of the sliding pin 46 is slidably fitted in a long groove 38a formed in the bottom plate 38 in a retaining state.

Reference numeral 47 denotes a guide plate fixed to the lower surface side of the lower plate portion 42 of the sliding bracket 41, and the guide plate 47 is in sliding contact with the side edge of the bottom plate 38.

The sliding bracket 41 is attached to the bottom plate 38.
The sliding pin 46 slides in the long groove 38a and the guide plate 47 slidingly contacting the side edge of the bottom plate 38, and slides in the sliding portion 36 between the front wall 39 and the rear wall 40. It is designed to move.

Reference numeral 48 denotes a positioning pin as a positioning means which is inserted into a positioning pin hole 42a formed in the lower plate portion 42 of the sliding bracket 41, and the lower end side of the positioning pin 48 is as shown in FIG. When the sliding bracket 41 collides with the rear wall 40 of the sliding portion 36, the sliding bracket 41 is fitted into the protruding positioning hole 38c of the bottom plate 38, so that the sliding bracket 41 is extended to the protruding position shown in FIG. To position. Also,
As shown in FIG. 6, when the sliding bracket 41 abuts on the front wall 39 of the sliding portion 36, the lower end side of the positioning pin 48 is fitted into the reduction positioning hole 38 b of the bottom plate 38, so that the sliding bracket 38. 41 is positioned in the contracted position shown in FIG.

Reference numerals 49 and 49 denote links before and after connecting the respective support brackets 34 of the center frame 32 and the respective sliding brackets 41. The respective links 49 are higher than the upper plate 50, the lower plate 51 and the side plate 52. It is shaped like a rigid box. Then, on the tip end side and the base end side of each link 49,
Pin holes 49a and 49b penetrating the upper plate 50 and the lower plate 51
Has been drilled.

Reference numeral 53 is a tip side connecting pin that rotatably connects one end side of the sliding bracket 41 and the tip side of the link 49, and the tip side connecting pin 53 is linked to the connecting pin hole 41a of the sliding bracket 41. The pin 49 is inserted into the pin hole 49a so as not to be pulled out.

Reference numeral 54 is a base end side connecting pin for rotatably connecting the support bracket 34 of the center frame 32 and the base end side of the link 49. The base end side connecting pin 54 is a pin insertion hole 34a of the support bracket 34. And link 49 pin hole 49
It is inserted into b and in a state that it does not come off.

In the tracked vehicle equipped with the truck frame 31 according to the present embodiment constructed as described above, the center frame 32 is jacked up by using, for example, a hydraulic jack before the lifting work. By extending the piston rod 20 of the telescopic cylinder 18, the side frame 33A is separated to a position (extended position) where the distance from the center of the center frame 32 is L1 ', as shown in FIG. At this time, the respective sliding brackets 41 of the front and rear coupling mechanism portions 35A move in the directions approaching each other (directions A and A in the arrow in FIG. 1), and slide with the overhanging positioning holes 38c of the bottom plate 38. By inserting the positioning pin 48 into the positioning pin hole 42a of the bracket 41, each sliding bracket 41 is positioned at the projecting position. Then, the links 49 connected to the sliding brackets 41 extend in parallel with each other, and
Support A in the extended position.

The connecting mechanism portion 35B also operates in the same manner as the above-mentioned connecting mechanism portion 35A, whereby the side frame 33B is supported at the extended position.

In this way, the side frames 33A,
By supporting 33B in the projecting position, it is possible to ensure stability during lifting work.

On the other hand, during transportation, the center frame 32
By retracting the piston rod 20 of the telescopic cylinder 18 with the jack up, the side frame 33B is moved to a position (reduced position) where the distance from the center of the center frame 32 is L2 ', as shown in FIG. Bring them closer. At this time, the sliding brackets 41 of the front and rear coupling mechanism portions 34B move in the directions away from each other (directions of arrows B and B in FIG. 1), and the reduction positioning holes 3 of the bottom plate 38.
By inserting the positioning pin 48 into the 8b and the positioning pin hole 42a of the sliding bracket 41, each sliding bracket 41 is positioned at the reduced position. Then, the links 49 connected to the sliding brackets 41 extend in the front-rear direction along the side frame 33B and are housed, and support the side frame 33B in the contracted position.

As described above, when the side frame 33B is supported in the contracted position, the links 49 connecting the center frame 32 and the side frame 33B are housed in a state of extending in the front-rear direction along the side frame 33B. Therefore, each link 49 does not project to the side of the side frame 33B, and the distance L2 'between the side frame 33B and the center of the center frame 32 is set to the distance between the leg 14B and the center frame 11 according to the prior art. It can be greatly shortened compared to the distance L3 from the center.

The coupling mechanism portion 35A operates in the same manner as the coupling mechanism portion 35B described above, and the side frame 33
A is supported in the contracted position.

Thus, according to the present embodiment, when the side frames 33A, 33B are supported in the contracted position, the links 49 connecting the center frame 32 and the side frames 33A, 33B have the side frames 33A, 3B.
Since it is stored in a state of being extended in the front-rear direction along 3B, the overall width of the track frame 31 can be significantly shortened, and the transportability and safety of the tracked vehicle equipped with the track frame 31 during transportation can be improved. It can be significantly improved.

Further, in this embodiment, each sliding bracket 41
Since the link function of each leg and the positioning function of each positioning mechanism according to the prior art can be shared by the link and the link 49, the number of parts can be reduced, workability at the time of assembly can be improved, and the track frame can be improved. The manufacturing cost of 31 can be reduced.

Further, according to the present embodiment, the work of moving the side frames 33A and 33B between the contracted position and the extended position is performed by moving the sliding brackets 41 to the side frame 3.
After sliding in the front-back direction of 3A, 33B, the positioning pin 48 can be easily inserted into the positioning pin hole 42a of the sliding bracket 41 and the reduction positioning hole 38b or the overhanging positioning hole 38c of the bottom plate 38. Therefore, the workability when disassembling and assembling the crawler crane from the transportation state to the working state or from the working state to the transportation state can be significantly improved.

In the above embodiment, the truck frame constituting the lower traveling body of the crawler crane has been described as an example, but the present invention is not limited to this, and can be applied to the lower traveling body such as a large hydraulic excavator. Can be applied.

[0054]

As described above in detail, according to the invention of claim 1, the connecting mechanism for connecting the center frame and the side frame is provided with each link provided between each side frame and each sliding bracket. Since each sliding bracket is configured with the positioning means for positioning with respect to each side frame, the structure of the coupling mechanism is simplified, the number of parts can be reduced, and the workability at the time of assembly can be greatly improved.

According to the second aspect of the invention, when the side frames are selectively positioned between the extended position and the contracted position, the sliding brackets approach or separate in the front-rear direction of the side frames. The front and rear links are housed in a state of extending in parallel along the side frames as the sliding brackets move. Therefore, when each side frame is positioned at the contracted position, each link does not project in the left-right direction of each side frame, and the overall width of the tracked vehicle can be effectively reduced.

Further, according to the third aspect of the present invention, the side frame can be automatically moved to the extended position and the contracted position by the hydraulic cylinder, and the workability of disassembling and assembling work at the time of work or transportation is greatly improved. Can be improved.

[Brief description of drawings]

FIG. 1 is a partially cutaway plan view showing a track frame according to an embodiment.

FIG. 2 is an enlarged view of an essential part showing a part of the connecting mechanism part shown in FIG. 1 in an enlarged manner.

FIG. 3 is an exploded perspective view, partially broken, showing an enlarged connecting mechanism portion in FIG.

FIG. 4 is an enlarged sectional view taken along the line IV-IV in FIG.

5 is a sectional view taken along the line VV in FIG.

FIG. 6 is an enlarged view of a main part similar to FIG. 2, showing the connecting mechanism when the side frame is moved to the contracted position.

FIG. 7 is an external view showing a crawler crane according to the related art.

FIG. 8 is a partially cutaway plan view showing a conventional track frame.

9 is an enlarged view of an essential part showing a connecting portion between the side frame and the center frame shown in FIG. 8 in an enlarged manner.

FIG. 10 is an enlarged view of a main part similar to FIG. 9, showing a state when the side frame is moved to the contracted position.

[Explanation of symbols]

 18 Expansion / contraction cylinder (hydraulic cylinder) 32 Center frame 33A, 33B Side frame 35 Coupling mechanism 35A, 35B Coupling mechanism part 38 Bottom plate 38b Reduction positioning hole 38c Overhang positioning hole 41 Sliding bracket 42a Positioning pin hole 48 Positioning pin ( Positioning means) 49 links

Claims (3)

[Claims] 1. A center frame, a pair of side frames disposed on both left and right sides of the center frame and extending in the front-rear direction, and each side frame can be extended left and right with respect to the center frame. In a track frame of a tracked vehicle comprising a connecting mechanism for connecting the connecting mechanism, the connecting mechanism is provided on the side frames separately from each other in the front and rear directions, and is connected to the front and rear sides of the side frames respectively. Sliding brackets, front and rear links located at the left and right, the front end of which is rotatably connected to each of the sliding brackets and the base end of which is rotatably connected to the center frame, and each of the side frames. Between each of the sliding brackets and each of the side frames, each side frame is in a contracted position close to the center frame, and an extended position in which the side frame extends from the center frame. And a track frame of a track-type vehicle, which comprises a positioning means for selectively positioning the sliding brackets. 2. The front and rear sliding brackets approach each other when the side frames are in the extended position to extend the front and rear links in a parallel state so that the side frames are 2. The track frame for a tracked vehicle according to claim 1, wherein the front and rear links are extended in the front-rear direction along the side frames by being separated from each other when in the contracted position. 3. A pair of left and right hydraulic cylinders are provided between the center frame and each side frame, and each hydraulic cylinder sets each side frame to an extended position when extended, and each side frame when reduced. The track frame of the tracked vehicle according to claim 1 or 2, wherein is the reduced position.