JP2018127181A - Crawler type running device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve transportability while preventing interference between a crawler running body and a connection part even in a case where the connection part is wider than a car body main body.SOLUTION: A lower running body 4 comprises: four crawler running bodies 11; and a car body 20 having a car body main body 21 with the four crawler running bodies 11 attached thereto and a connection part 22 provided on the car body main body 21 and used for connecting an upper revolving body disposed in an upper position of the car body 21. The connection part 22 is formed wider than the car body main body 21 in a lateral direction B. The four crawler running bodies 11 compose two pairs 10 of crawler running bodies arranged so as to sandwich the car body main body 21 in the lateral direction B. The two pairs 10 of crawler running bodies are arranged so as to sandwich the connection part 22 in a longitudinal direction A.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a crawler type traveling device having a plurality of crawler traveling bodies.

  Patent Document 1 describes a hydraulic excavator having a crawler-type traveling device configured such that the distance between a pair of crawler traveling bodies arranged on the left and right can be expanded and contracted. Since the pair of crawler traveling bodies is configured to be able to expand and contract in this way, it is possible to widen the interval between the pair of crawler traveling bodies during work, and to ensure the stability of the overturn during the work of the hydraulic excavator. It becomes possible. On the other hand, when a hydraulic excavator is transported, it is possible to cope with a case where it is necessary to reduce the distance between the pair of crawler traveling bodies in accordance with transport regulations. Further, when the hydraulic excavator is stored, the space between the crawler traveling bodies can be reduced in order to reduce the space occupied by the storage space.

JP 2014-189224 A

  In the hydraulic excavator described in Patent Document 1, the pair of crawler traveling bodies is long in the front-rear direction and is disposed so as to sandwich the swivel base in the left-right direction. When the working capacity of the hydraulic excavator (the working capacity of the working device on the crawler type traveling device) is improved, it is necessary to enlarge the swivel base in accordance with the improvement of the working capacity. If the swivel base becomes larger than the width in the left-right direction of the car body main body due to the improvement of work ability, the pair of crawler traveling bodies and the swivel base interfere with each other. In order to avoid this interference, if the interval when the pair of crawler traveling bodies is reduced is increased, there arises a problem that the transportability of the hydraulic excavator is lowered.

  Therefore, an object of the present invention is to provide a crawler type traveling device capable of improving transportability while preventing interference between the crawler traveling body and the connecting portion even if the width of the connecting portion is larger than that of the car body main body. It is.

  The crawler type traveling device of the present invention is provided with a plurality of crawler traveling bodies having a crawler frame with a crawler belt mounted on the outer periphery, a car body main body to which the plurality of crawler traveling bodies are attached, and the car body main body. And a car body having a connection portion for connecting a working device disposed above the car body main body. The connecting portion is formed to have a width larger than that of the car body main body in the left-right direction, and the plurality of crawler traveling bodies are arranged so as to sandwich the car body main body in the left-right direction. Two crawler traveling body pairs are configured, and the two crawler traveling body pairs are arranged so as to sandwich the connecting portion in the front-rear direction.

  According to this, since the two crawler traveling body pairs are arranged so as to sandwich the connecting portion in the front-rear direction, even if the width of the connecting portion is larger than the car body body, the interference between the crawler traveling body and the connecting portion is prevented. On the other hand, it is possible to improve the transportability by reducing the distance between the pair of crawler traveling bodies in the left-right direction.

  In the present invention, the left and right crawler traveling bodies constituting the pair of crawler traveling bodies have a crawler contraction position in which the separation distance in the left-right direction is smaller than the width of the connection portion, and the separation distance in the crawler contraction position. It is preferable that it is attached to the car body main body so as to be movable in the left-right direction between a larger crawler extension position. Thereby, it becomes possible to improve transportability by arranging the crawler traveling body pair in the crawler contraction position, and improving the stability during operation by arranging the crawler traveling body pair in the crawler extended position. It becomes possible.

  In the present invention, it is preferable that the connecting portion is formed so that the width in the left-right direction increases as it approaches upward. Thus, even when the two crawler traveling body pairs are close to each other in the front-rear direction, the distance between the left and right crawler traveling bodies constituting the crawler traveling body pair without disposing the entire connection portion above the crawler traveling body is reduced. It can be made smaller. For this reason, it becomes possible to further improve transportability, ensuring the stability at the time of work.

  Further, in the present invention, the crawler belt is connected to a first extension portion extending in the front-rear direction below the crawler frame, and an end portion of the first extension portion, and the first extension portion, The crawler frame is attached to the crawler frame so that a second extending portion extending in a direction intersecting the horizontal direction is configured so that the angle between the crawlers is an acute angle. It is preferable that the 2nd extension part is arrange | positioned so that the said connection part can be opposed along an up-down direction. Accordingly, the two crawler traveling body pairs can be disposed closer to each other in the front-rear direction without disposing the entire connecting portion above the crawler traveling body.

  In the present invention, it is preferable that the connection portion has a swivel seat at an upper portion. Thereby, it becomes possible to support a working device so that turning is possible.

  According to the crawler type traveling device of the present invention, since the two crawler traveling body pairs are arranged so as to sandwich the connecting portion in the front-rear direction, the crawler traveling body is connected even if the width of the connecting portion is larger than the car body main body. It is possible to improve the transportability by reducing the distance between the crawler traveling body pairs in the left-right direction while preventing interference with the parts.

It is a side view which shows the crawler crane with which the lower traveling body as a crawler type traveling device concerning one embodiment of the present invention was adopted. It is a schematic plan view of the lower traveling body shown in FIG. It is sectional drawing along the III-III line | wire shown in FIG. It is an enlarged view of the area | region enclosed with the dashed-dotted line shown in FIG.

  Hereinafter, a crawler crane 100 in which a lower traveling body as a crawler type traveling device according to an embodiment of the present invention is employed will be described with reference to FIGS. The crawler crane 100 is used for cargo handling work and the like. The boom 7 side of the crawler crane 100 is the front, the counterweight 6 side is the rear, and the right and left sides of the crawler crane 100 are described as directions when the crawler crane 100 is viewed from the front. In FIG. 2, the upper side in the figure is the right side and the lower side is the left side.

  As shown in FIG. 1, the crawler crane 100 according to the present embodiment includes an upper swing body 2 and a lower traveling body 4 as a work device for performing a cargo handling work. The upper turning body 2 is attached to the lower traveling body 4 so as to be turnable. The upper swing body 2 includes a cab (a casing that defines a cab) 5, a counterweight 6, a boom 7, a hook (not shown), and the like. The cab 5 and the counterweight 6 are provided in front and rear of the upper swing body 2, respectively. The boom 7 is a telescopic boom that is provided on the upper swing body 2 so as to be raised and lowered. The boom 7 may be a lattice boom and is not particularly limited.

  In addition, the upper swing body 2 is provided with an engine (not shown) serving as a drive source for each operation such as running, turning, and lifting. A hydraulic pump is connected to the output shaft of the engine. When the engine operates, pressure oil is sent from a hydraulic pump (not shown) to a hydraulic actuator related to each operation.

  As shown in FIGS. 1 and 2, the lower traveling body 4 includes four crawler traveling bodies 11 and a car body 20 to which the four crawler traveling bodies 11 are attached. The car body 20 has a substantially rectangular parallelepiped car body main body 21 extending in the front-rear direction A, and a connection for connecting the upper swing body 2 provided on the car body main body 21 and disposed above the car body main body 21. A portion 22 and two axles 25 for attaching the crawler traveling body 11 to the car body main body 21 are provided.

  At both ends of the car body main body 21 in the front-rear direction A, four support portions 23a and 23b projecting from the right side surface 21a and the left side surface 21b are provided. As shown in FIG. 2, the support portion 23 a located on the right side when viewed from the front is disposed slightly shifted forward from the support portion 23 b located on the left side. A hydraulic jack 24 is provided at the tip of each support portion 23a, 23b. Further, each of the support portions 23a and 23b is configured to be able to project the hydraulic jack 24 in the left-right direction B. Each hydraulic jack 24 is supported by support parts 23a and 23b so that it can extend and contract in the vertical direction C. By these four hydraulic jacks 24, the lower traveling body 4, that is, the crawler crane 100 can be jacked up.

  As shown in FIG. 2, the axle 25 is disposed in the front-rear direction A, between the center portion and the front end portion of the car body main body 21 and between the center portion and the rear end portion. The axle 25 extends in the left-right direction B, and the left and right end faces have a rectangular shape. As shown in FIG. 3, the axle 25 has a recess 25 a that can be fitted to the car body main body 21 at the center in the left-right direction B. The axle 25 is fixed to the car body main body 25 with the recess 25a fitted from below, and is configured to protrude outward from the right side surface 21a and the left side surface 21b of the car body main body 21.

  As shown in FIGS. 1 and 2, the connecting portion 22 is a central portion in the front-rear direction A of the car body main body 21 and is arranged from the center in the up-down direction C to the upper portion. As shown in FIGS. 2 to 4, the connecting portion 22 includes a top plate 26 fixed at the upper center of the car body main body 21, and support plates provided on the right side surface 21 a and the left side surface 21 b of the car body main body 21. 27 and a slewing bearing 28. A known bearing connected to the upper swing body 2 is adopted as the swing bearing 28 (swivel seat), and is fixed on the top plate 26. As shown in FIG. 2, the slewing bearing 28 has a diameter larger than the width of the car body main body 21 in the left-right direction B. As the slewing bearing 28, a larger diameter is adopted when the working capability of the upper slewing body 2 is increased. In order to cope with such a large-diameter swivel bearing 28, the top plate 26 is also formed so that the central portion is wide in the left-right direction B. That is, the width W1 of the connecting portion 22 in the left-right direction B is larger than the width W2 of the car body main body 21 in the left-right direction B.

  As shown in FIGS. 2 and 4, the support plate 27 includes a front part 27 a, a center part 27 b, and a rear part 27 c formed by bending a single plate-like member. The two support plates 27 connect the lower surface of the top plate 26 to the right side surface 21a and the left side surface 21b, and support a portion of the top plate 26 wider than the car body main body 21 from below. As shown in FIG. 3, the central portion 27 b is arranged so as to constitute an inclined surface 27 b 1 that is inclined so as to be positioned upward in the left-right direction B toward the outside. Thereby, the connection part 22 is comprised so that the width | variety of the left-right direction B may become large as it approaches upwards.

  As shown in FIGS. 2 to 4, the front portion 27 a forms an inclined surface 27 a 1 that is inclined so as to be located upward as it goes forward while being located upward as it goes outward in the left-right direction B. So that it is arranged. The rear part 27c is arranged symmetrically with the front part 27a with respect to a center line D parallel to the left-right direction B passing through the center of the connection part 22 (center of the turning bearing 28). In other words, the rear portion 27c is also arranged so as to constitute an inclined surface 27c1 that is inclined upward so as to be positioned upward while being positioned upward as it goes outward in the left-right direction B.

  Next, the crawler traveling body 11 will be described. Since all four crawler traveling bodies 11 have the same configuration, only one crawler traveling body 11 will be described. As shown in FIGS. 1 and 4, the crawler traveling body 11 includes a crawler frame 16 and a crawler belt 17 attached to the outer periphery of the crawler frame 16. The crawler frame 16 includes a drive tumbler 13, an idler 12, a plurality of upper rollers 14 and a plurality of lower rollers 15, and a frame body 16a that rotatably supports these.

  The crawler belt 17 is configured by connecting a plurality of shoes 17 a in a ring shape, and is spanned around a drive tumbler 13, an idler 12, a plurality of upper rollers 14, and a plurality of lower rollers 15. The frame body 16a is provided with a travel motor and a travel speed reducer (not shown), and the power from the travel motor is transmitted to the drive tumbler 13 through the travel speed reducer. When the drive tumbler 13 is driven, the crawler belt 17 travels and the crawler crane 100 moves in the front-rear direction A. Further, as shown in FIGS. 1 and 2, a hollow axle box 16b is formed in the frame body 16a. When the axle 25 is slidably fitted in the axle box 16b in the left-right direction B, the crawler traveling body 11 is connected to the car body main body 21 so as to be movable in the left-right direction B.

  The car body 20 is provided with four expansion / contraction cylinders (not shown) for moving each crawler traveling body 11 in the left-right direction B. The four expansion / contraction cylinders are disposed, for example, in the vicinity of a portion of the axle 25 that protrudes left and right from the car body main body 21 and between the car body main body 21 and each crawler traveling body 11. By the expansion / contraction operation of the expansion / contraction cylinder by hydraulic control, the left and right crawler traveling bodies 11 constituting the later-described crawler traveling body pair 10 move in the left-right direction B, and the separation distance in the left-right direction B is changed.

  2 and 3, the crawler traveling body 11 indicated by a solid line shows a state where the crawler traveling body 11 in the left-right direction B is disposed at the crawler extended position where the separation distance between the crawler traveling bodies 11 is the maximum value T1. 2 and 3, the crawler traveling body 11 indicated by a two-dot chain line indicates a state where the crawler traveling body 11 in the left-right direction B is disposed at the crawler reduction position where the separation distance between the crawler traveling bodies 11 is the minimum value T2. When the crawler traveling body 11 is arranged at the crawler reduction position, the separation distance between the crawler traveling bodies 11 in the left-right direction B is smaller than the width W1 of the connecting portion 22 in the left-right direction B. Thus, by arranging the left and right crawler traveling bodies 11 constituting the crawler traveling body pair 10 described later at the crawler contraction position, it becomes possible to improve the transportability of the crawler crane 100, and the crawler traveling body pair 10 is expanded as a crawler. By arranging it at the position, it is possible to improve the stability during operation.

  The crawler belt 17 includes a lower extending portion 18a (first extending portion) extending in the front-rear direction A below the crawler frame 16, and an upper portion extending in the front-rear direction A above the crawler frame 16. The extending portion 18b, a direction intersecting with the horizontal direction and extending forwardly so as to incline downward as it approaches the front, and a direction intersecting the horizontal direction In this case, the crawler frame 16 is mounted on the outer periphery so as to constitute a rear extension 18d (second extension) that extends downwardly as it approaches the rear. Both ends of the front extension 18c and the rear extension 18d are connected to the lower extension 18a and the upper extension 18b. Further, as shown in FIG. 4, the front extension 18c and the rear extension 18d are configured such that the angles θ1 and θ2 between the front extension 18c and the rear extension 18d are acute angles.

  As shown in FIG. 2, the four crawler traveling bodies 11 constitute two crawler traveling body pairs 10 disposed so as to sandwich the car body main body 21 in the left-right direction B. These crawler traveling body pairs 10 are arranged so as to sandwich the connecting portion 22 in the front-rear direction A. More specifically, as shown in FIGS. 3 and 4, the crawler traveling body 11 is disposed at a position where the upper portion thereof overlaps with the support plate 27 of the connecting portion 22 along the front-rear direction A in the crawler reduced position. The connecting portion 22 is sandwiched between the two crawler traveling bodies 11 arranged adjacent to each other in the front-rear direction A. Further, the crawler traveling body 11 is disposed so that either the front extending portion 18c or the rear extending portion 18d faces the support plate 27 of the connecting portion 22 along the vertical direction C in the crawler contraction position. . Even when the crawler traveling body 11 is arranged in this way, the front extending portion 18c and the rear extending portion 18d of the crawler traveling body 11 are inclined, so that the entire connecting portion 22 is located above the crawler traveling body 11. The two crawler traveling bodies 11 can be arranged close to each other in the front-rear direction A without being arranged and interfering with the connection portion 22. Thus, the length of the crawler traveling body 11 in the front-rear direction A can be increased by the amount that the crawler traveling body 11 can be disposed closer to the front-rear direction A. For this reason, it becomes possible to reduce a ground pressure. Moreover, it becomes possible to make the height of the connection part 22 low, the stability of the crawler crane 100 increases, and it becomes difficult to fall down, and transportability is also improved.

  Further, the four crawler traveling bodies 11 are disposed between the hydraulic jacks 24 in the front-rear direction A. Further, as shown in FIG. 1, the front crawler traveling body 11 is arranged such that the front end portion thereof is close to the front hydraulic jack 24. For this reason, it becomes possible to ensure the approach angle θ3 sufficiently. Further, the rear crawler traveling body 11 is arranged such that the rear end portion thereof is close to the rear hydraulic jack 24. For this reason, it is possible to sufficiently secure the departure angle θ4. For this reason, it becomes difficult for the hydraulic jack 24 arranged in the front-rear direction A to contact the ground.

  As described above, according to the lower traveling body 4 of the crawler crane 100, since the two crawler traveling body pairs 10 are arranged so as to sandwich the connecting portion 22 in the front-rear direction A, the width W1 of the connecting portion 22 is reduced to the car. Even if it is larger than the width W2 of the body main body 21, it is possible to improve the transportability by reducing the distance in the left-right direction B of the crawler traveling body pair 10 while preventing the interference between the crawler traveling body 11 and the connecting portion 22. .

  Further, the left and right crawler traveling bodies 11 constituting the crawler traveling body pair 10 are attached to the car body main body 21 so as to be movable in the left-right direction B between the crawler reduced position and the crawler expanded position. For this reason, it becomes possible to improve transportability by disposing the crawler traveling body pair 10 in the crawler contraction position, and improving the stability during operation by disposing the crawler traveling body pair 10 in the crawler extended position. It becomes possible.

  Further, since the width of the connecting portion 22 in the left-right direction B is increased as it approaches the upper side, the connecting portion 22 is also in a state where the two crawler traveling body pairs 10 are brought close to each other in the front-rear direction A. The distance between the left and right crawler traveling bodies 11 constituting the crawler traveling body pair 10 can be reduced without disposing the entirety above the crawler traveling body 10. Therefore, the transportability can be further improved while ensuring the stability during the work.

  Further, the crawler belt 17 is configured such that the angles θ1 and θ2 between the front extending portion 18c and the rear extending portion 18d and the lower extending portion 18a are acute angles. The extending portion 18 c and the rear extending portion 18 d are arranged so as to face the connecting portion 22 along the vertical direction C. Therefore, the two crawler traveling body pairs 10 can be disposed closer to each other in the front-rear direction A without disposing the entire connecting portion 22 above the crawler traveling body 11.

  Moreover, the connection part 22 has the turning bearing 28 in the upper part. For this reason, it becomes possible to support the upper turning body 2 so that turning is possible.

  The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and various modifications can be made as long as they are described in the claims. The crawler traveling body 11 in the above-described embodiment is arranged so that either the front extension portion 18c or the rear extension portion 18d faces the connection portion 22 along the vertical direction C. It may be arranged so as to be shifted in the front-rear direction A up to a position that does not face the connecting portion 22 along. Further, the connecting portion 22 may have the same width in the left-right direction B over the entire width in the up-down direction C, or may increase as it approaches the lower side. In this case, the two crawler traveling body pairs 10 should just be arrange | positioned so that the connection part 22 may be pinched | interposed in the front-back direction A.

  Further, the left and right crawler traveling bodies 11 constituting the crawler traveling body pair 10 may be fixed at the crawler reduction position. In short, the two crawler traveling body pairs 10 are sandwiched in the front-rear direction A. Should just be arranged. Further, the crawler belt 17 does not have the front extending portion 18c and the rear extending portion 18d, but simply has the lower extending portion 18a and the upper extending portion 18b, which are connected at both ends in the front-rear direction A. May be. Further, the crawler belt 17 may be configured by connecting a lower extending portion 18a, a front extending portion 18c, and a rear extending portion 18d in order. Moreover, the connection part 22 does not have the turning bearing 28, and may support the upper turning body 2 from below so as not to turn.

  Moreover, although the lower traveling body 4 in the above-described embodiment has the two crawler traveling body pairs 10 that sandwich the connecting portion 22 in the front-rear direction A, the lower traveling body 4 further includes one or more crawler traveling body pairs 10. Also good. That is, the lower traveling body as the crawler traveling device may include three or more crawler traveling body pairs 10. The upper swing body 2 may also be a working device other than a crane.

2 Upper swing body (working device)
4 Lower traveling body (crawler traveling device)
DESCRIPTION OF SYMBOLS 10 Crawler traveling body 11 Crawler traveling body 16 Crawler frame 17 Crawler belt 18a Lower extension part (1st extension part)
18c Front extension part (2nd extension part)
18d Rear extension (second extension)
20 Car body 21 Car body body 22 Connection part 28 Slewing bearing (swivel seat)

Claims (5)

A plurality of crawler traveling bodies having a crawler frame having a crawler belt mounted on the outer periphery;
A car body main body to which the plurality of crawler traveling bodies are attached; and a car body having a connection portion provided on the car body main body for connecting a work device disposed above the car body main body. And
The connecting portion is formed to have a width larger than that of the car body body in the left-right direction,
The plurality of crawler traveling bodies constitute at least two crawler traveling body pairs arranged so as to sandwich the car body main body in the left-right direction,
The crawler type traveling device, wherein the two crawler traveling body pairs are arranged so as to sandwich the connecting portion in the front-rear direction.   The left and right crawler traveling bodies constituting the pair of crawler traveling bodies have a crawler expansion position in which the separation distance in the left-right direction is smaller than the width of the connecting portion, and the crawler expansion in which the separation distance is larger than in the crawler reduction position The crawler type traveling device according to claim 1, wherein the crawler traveling device is attached to the car body main body so as to be movable in the left-right direction between positions.   The crawler type traveling device according to claim 1, wherein the connection portion is formed so that the width in the left-right direction becomes larger as approaching upward. The crawler belt is connected to a first extension portion extending in the front-rear direction below the crawler frame and an end portion of the first extension portion, and an angle between the first extension portion is an acute angle. And is mounted on the crawler frame so as to form a second extending portion extending in a direction intersecting the horizontal direction,
The crawler traveling device according to claim 3, wherein the crawler traveling body is arranged such that the second extending portion can be opposed to the connecting portion along a vertical direction.   The crawler type traveling device according to any one of claims 1 to 4, wherein the connecting portion has a swivel seat at an upper portion thereof.

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