JP2006176087A - Construction machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent intrusion of earth and sand or the like into an axle insertion hole without increase of the number of parts and weight of a traveling body. <P>SOLUTION: The construction machine is constituted such that the axle 10 of a car body is slidably inserted to the axle insertion hole 11 of a crawler frame 6, and vehicle width can be expandably/contractably changed by moving the crawler frame 6 in a vehicle width direction. A step 14 for getting on/off is mounted to an outer surface of the crawler frame 6 in such a state that it covers the approximately lower half part of an opening 11a of the axle insertion hole 11 such that earth and sand, rock, broken up scrap or the like neither intrude from the opening 11a into the axle insertion hole 11 nor collide with a neighborhood of the opening 11a. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a construction machine having a crawler type lower traveling body such as a hydraulic excavator or a dismantling machine.

  For example, a hydraulic excavator and a demolition machine formed by diverting the excavator are, as shown in FIG. 7, a crawler type lower traveling body 1 and an upper portion mounted on the lower traveling body 1 so as to be rotatable about a vertical axis. The revolving body 2 is provided, and the upper revolving body 2 is provided with an engine and other equipment and a cabin 3, and a work attachment (only a part of the boom is shown in the figure) 4 is attached to the front part.

  As shown in FIG. 8, the lower traveling body 1 includes a car body 5, left and right crawler frames 6, 6, and crawlers that are wound around drive wheels 7 and idler wheels 8 around the crawler frames 6, 6. (Only one side is shown in FIG. 7).

  Axles 10 projecting outward in the vehicle width direction are provided on both front and rear sides of the car body 5, and the axles 10 are provided on both sides of the crawler frames 6 and 6 so as to penetrate in the vehicle width direction. It is inserted in the axle insertion hole 11 so as to be slidable in the vehicle width direction.

  Further, expansion and contraction cylinders 12 and 12 are provided between the car body 5 and both the crawler frames 6 and 6 at the center in the front-rear direction of the car body 5, and the left and right crawler frames 6 and 12 are expanded and contracted by the expansion and contraction cylinders 12 and 12. 6 moves in the vehicle width direction, and the vehicle width is enlarged or reduced (see Patent Document 1).

  On the other hand, in order to get on and off the upper revolving structure 2 (cabin 3 and other upper structural parts) from the ground, steps on the outer surface side of the front and rear sides (a total of four places) of both crawler frames 6 and 6 (only the left and right sides in FIG. ... Are provided. This step 13 is provided at a position where it is easy to access the target part (cabin 3 and the like) for getting on and off.

In addition, there is no prior art document regarding this step 13.
Japanese Patent Laid-Open No. 10-17274

  However, in the conventional construction machine, since the opening 11a on the outer surface side of the axle insertion hole 11 is directly and entirely open to the outside, earth and sand, rocks and demolition glass (hereinafter referred to as earth and sand) during traveling and work. Etc.) from the outside through the opening 11a and easily entered and accumulated in the axle insertion hole 11 or collided with the vicinity of the opening 11a.

  For this reason, troubles such as damage to the vicinity of the opening 11a, or excessive sliding resistance of the axle 10 due to intruded / accumulated earth and sand when the vehicle width is expanded / contracted and the expansion / contraction motion cannot be performed smoothly have occurred.

  In addition, although the said trouble can be avoided if the opening part 11a is plugged from the outside with a protective cover such as a plate material, the number of parts is increased and the cost is increased, and the weight of the lower traveling body 1 is increased by the protective cover. This is not a good idea.

  Therefore, the present invention provides a construction machine that can prevent entry of earth and sand into an axle insertion hole, collision with the vicinity of an opening, and the like without increasing the number of parts and the weight of a traveling body.

  According to the invention of claim 1, an upper swing body is mounted on a lower traveling body, and the lower traveling body includes a car body and left and right crawler frames, and has an axle projecting from the left and right sides of the car body. In a construction machine configured to be slidably inserted into an axle insertion hole provided through both sides of a crawler frame in the vehicle width direction, and both the crawler frames can be moved in the vehicle width direction to change the vehicle width. The step of getting on and off the upper swing body is provided on the outer surface of the crawler frame of the lower traveling body so as to cover at least a part of the opening of the axle insertion hole from the outside.

  According to a second aspect of the present invention, in the configuration of the first aspect, the step is provided so as to cover the lower part of the opening of the axle insertion hole from the outside.

  According to a third aspect of the present invention, in the configuration of the first or second aspect, the step is formed in a plate shape, and a window hole for a footrest is provided in the step.

  According to a fourth aspect of the present invention, in the configuration according to any one of the first to third aspects, the width of the step is substantially the same as the width of the opening of the axle insertion hole, and at least a part of the opening in the vertical direction is substantially full. It is provided in a state of covering from outside.

  According to a fifth aspect of the present invention, in the configuration of the fourth aspect, the step is formed in a U-shape in a plan view provided with protective walls on both the front and rear sides.

  The invention of claim 6 is the structure according to any one of claims 1 to 5, wherein a mounting bracket is provided at a lower part of the step, and the mounting bracket is attached to the crawler frame below the opening of the axle insertion hole. is there.

  A seventh aspect of the present invention is the structure according to any one of the first to sixth aspects, wherein the step is detachably attached to the crawler frame.

  According to the present invention, the step for getting on and off the upper revolving structure is provided in a state in which at least a part of the opening of the axle insertion hole is covered from the outside, so that the entry of the earth and sand into the axle insertion hole is performed by this step. Can be suppressed.

  Moreover, since the step, which is a part for getting on and off, is also used as a protective cover, there is no adverse effect of increasing the number of parts and weight of the lower traveling body.

  By the way, earth and sand or the like enter the opening from below the traveling body close to the ground and easily collide.

  In this respect, according to the invention of claim 2 in which the step is provided so as to cover the lower portion of the axle insertion hole, it is possible to effectively suppress the entry and collision of earth and sand.

  In the invention of claim 3, since the plate-like step is provided with a window hole for footing and the opening is protected by the surface, the protective effect is enhanced and the step can be light.

  On the other hand, according to the invention of claim 4, since earth and sand can be blocked at the full width portion of the opening, according to the invention of claim 5, intrusion and collision of earth and sand from both the front and rear sides can be avoided by the protective walls on both sides. Therefore, the protective effect can be further enhanced. According to the invention of claim 5, since a space is formed between the crawler frame by the front and rear protective walls, it is easy to put a foot tip.

  According to the invention of claim 6, since the mounting bracket is provided at the lower part of the step where the thrust force from below due to earth and sand is likely to act, and this mounting bracket is attached to the crawler frame below the opening, the lower part of the step is strengthened. This can increase the push-up strength. In addition, the steps are lighter than in the case where brackets are provided in the entire vertical direction.

  Further, according to the seventh aspect of the present invention, since the step is detachably attached to the crawler frame, the step can be removed particularly during the divided transportation of a large machine, and the transport unit of the lower traveling body can be lightened.

  An embodiment of the present invention will be described with reference to FIGS.

  In the following embodiments, the same parts as those of the conventional construction machine shown in FIGS.

  The basic structure of this construction machine, that is, the axles 10 projecting outward in the vehicle width direction are provided on both front and rear sides of the car body 5 of the lower traveling body 1, and these axles 10 are provided on the left and right crawler frames 6,6. The crawler frames 6, 6 on both sides slide in the vehicle width direction due to the point of being slidably inserted into the axle insertion holes 11 provided penetrating in the vehicle width direction on both the front and rear sides, and the expansion / contraction cylinders 12, 12. Is the same as conventional machines.

  As in the conventional machine, as shown in FIGS. 1 and 2, the step 14 for getting on and off the upper swing body (not shown here) is carried out on both the front and rear sides of both crawler frames 6 and 6 (see FIG. 7). Are provided on the outer surface side at a position where it can be easily accessed.

  In this construction machine, the axle insertion hole 11 is provided at the same position as the step 14, and the step 14 also serves as a protective cover that covers the opening 11 a of the axle insertion hole 11 and suppresses intrusion of dirt and the like from the outside. It is attached to the crawler frames 6 and 6 in a state.

  The configuration and mounting structure of step 14 will be described in detail with reference to FIGS.

  Step 14 is a plan view view comprising a rectangular main body 15 facing the opening 11a and protective walls 16 and 16 projecting toward the crawler frame 6 on both front and rear sides of the main body 15 by a plate material. It is formed in a letter shape.

  The overall width dimension W1 of this step 14 (see FIG. 3) is set to be substantially the same as the width dimension W2 of the opening 11a (exactly the same, slightly larger or smaller as shown in the figure). Thick plate-like mounting brackets 17 and 17 are attached to the lower outer surface of the (protective walls 16 and 16).

  The mounting brackets 17 and 17 are detachably attached to the outer surface of the crawler frame 6 by bolts 18 at a position lower than the opening 11a, so that the step 14 has a substantially full width at the substantially lower half of the opening 11a. It is attached in a state of covering.

  In addition, a window hole 19 is provided in the main body portion 15 of step 14 as a lower leg rest portion. Further, the lower opening edge 15a of the window hole 19 and the main body upper surface 15b serving as an upper leg are formed in an uneven shape to prevent slipping.

  3 to 6, reference numeral 20 denotes a reinforcing plate provided on the lower inner surface side of the intermediate portion in the front-rear direction of the main body portion 15.

  In this way, by covering the substantially lower half of the opening 11a of the axle insertion hole 11 with the step 14, intrusion of earth and sand etc. into the axle insertion hole 11, and collision of rocks and demolition gravel into the vicinity of the opening 11a Can be suppressed.

  In addition, since the step 14 which is a boarding / exiting part is also used as a protective cover, there is no adverse effect that the number of parts and the weight of the lower traveling body 1 are increased.

  Further, according to this embodiment, the following effects can be obtained.

  (A) Sediment or the like easily enters the opening 11a from below the traveling body close to the ground, and easily collides with the vicinity of the opening.

  In this respect, since the step 14 is provided in a state of covering substantially the lower half of the opening 11a, it is possible to effectively suppress the entry and collision of earth and sand.

  (B) Since the stepped window hole 19 is provided in the plate-like step 14 and the opening 11a is protected by the surface, the protective effect is enhanced and the step 14 is light.

  (C) Since the width dimension W1 of step 14 is made substantially equal to the width dimension W2 of the opening 11a, the earth and sand can be blocked at the full width portion of the lower half of the opening.

  (D) Step 14 is formed in a U-shape in plan view by the main body 15 and the protective walls 16 and 16 on both front and rear sides, so that intrusion and collision of earth and sand from both the front and rear sides as well as from the front side are avoided can do.

  Moreover, since a space is formed between the crawler frame 6 by the front and rear protective walls 16, 16, it is easy to put a foot tip.

  (E) Since the lower part of the step 14 where the thrust force from below due to earth and sand is likely to act is attached to the crawler frame 6 by the mounting bracket 17, the step lower part can be reinforced to increase the thrust strength. Further, the step 14 can be lighter than the case where the bracket 17 is provided in the entire vertical direction.

  (F) Since the mounting bracket 17 is bolted to the crawler frame 6 and the step 14 is detachably mounted, it is possible to remove the step 14 and reduce the transport unit of the lower traveling body, particularly when a large machine is divided and transported. .

  By the way, the step 14 may not be formed in a plate shape, but may be formed in a grid shape in which a plurality of bars are provided at intervals in the vertical or horizontal direction, or a net shape in which a plurality of bars are provided at intervals in the vertical and horizontal directions. .

  In the above-described embodiment, the lower half of the opening 11a is covered in step 14, but the middle, upper, or entire area of the opening 11a may be covered.

  Further, a footrest may be provided in a hook shape on the outer surface of step 14.

It is a schematic plan view of the lower traveling body of the construction machine according to the embodiment of the present invention. It is the same side view. It is the figure which expanded a part of FIG. It is the IV-IV line expanded sectional view of FIG. It is the VV line expanded sectional view of FIG. It is a perspective view of the step attachment part of the crawler frame which shows embodiment of this invention. It is a schematic side view of the conventional construction machine. It is a schematic plan view of the lower traveling body of the machine.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lower traveling body 2 Upper revolving body 5 Car body 6 Crawler frame 11 Axle insertion hole 11a Axle insertion hole opening 14 Step 15 Step body 16, 16 Front and rear protective walls 17 Mounting bracket 18 Attaching the bracket to the crawler frame Bolt 19 Window hole

Claims (7)

  An upper turning body is mounted on the lower traveling body, and the lower traveling body includes a car body and left and right crawler frames, and axles projecting from the left and right sides of the car body are arranged on both crawler frames in the vehicle width direction. In the construction machine configured to be slidably inserted into an axle insertion hole provided in a through-hole and move both crawler frames in the vehicle width direction to enlarge or reduce the vehicle width, the crawler of the lower traveling body A construction machine characterized in that a step for getting on and off the upper swing body is provided on the outer surface of the frame in a state of covering at least a part of the opening of the axle insertion hole from the outside.   2. The construction machine according to claim 1, wherein the step is provided in a state in which a lower portion of the opening of the axle insertion hole is covered from the outside.   3. The construction machine according to claim 1, wherein the step is formed in a plate shape, and a window hole for a footrest is provided in the step.   The construction machine according to any one of claims 1 to 3, wherein the width of the step is substantially the same as the width of the opening of the axle insertion hole, and at least a part of the opening in the vertical direction covers substantially the entire width. The construction machine is provided in a state of being covered from the outside.   5. The construction machine according to claim 4, wherein the step is formed in a U-shape in plan view with protective walls on both front and rear sides.   The construction machine according to any one of claims 1 to 5, wherein a mounting bracket is provided at a lower portion of the step, and the mounting bracket is attached to the crawler frame below the opening of the axle insertion hole. Construction machinery to do.   The construction machine according to any one of claims 1 to 6, wherein the step is detachably attached to the crawler frame.

Images