Crawler Crane

Abstract

To provide a crawler crane capable of suppressing the increase of a trailer size and moreover, capable of performing incidental works associated with transportation using multiple jack devices when transporting a car body and a superstructure attached to the car body in one trailer.SOLUTION: In the state that a left-front jack device 60FL and a right-front jack device 60FR are arranged at diagonally forward position where a front beam 61 of the left-front jack device 60FL and the front beam 61 of the right-front jack device 60FR extends diagonally forward left and diagonally forward right from a car body 20, a front axle 30A of a crawler crane 100 has the shape so that a left-front space S1 and a right-front space S2 where a front leg part 62 of the left-front jack device 60FL and the front leg part 62 of the right-front jack device 60FR are arranged respectively, are formed between the front axle 30A and a rear axle 30B.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to crawler cranes. [Background technology]

[0002] A crawler crane comprises a lower running body, an upper rotating body rotatably supported on the lower running body, a hoisting member including a boom supported on the upper rotating body so that it can be raised and lowered, and a plurality of jack devices (a plurality of translifters).

[0003] In the crawler crane described in Patent Document 1, the lower traveling body includes left and right crawler traveling devices, a car body, and front and rear car body weights. The upper rotating body is attached to the car body. The front and rear car body weights are attached to the front and rear of the car body, respectively. The car body connects the left and right crawler traveling devices. The multiple jack devices include two jack devices attached to the front of the car body spaced apart in the left-right direction, and two jack devices attached to the rear of the car body spaced apart in the left-right direction.

[0004] In the crawler cranes described in Patent Documents 2 and 3, the lower traveling body includes left and right crawler traveling devices, a car body, a front axle, and a rear axle. The upper rotating body is attached to the car body. The front axle is attached to the front of the car body, and the rear axle is attached to the rear of the car body. The front axle and the rear axle each connect the left and right crawler traveling devices. The multiple jack devices include two front jack devices attached to the front axle with a gap between them in the left-right direction, and two rear jack devices attached to the rear axle with a gap between them in the left-right direction.

[0005] Since crawler cranes cannot run on public roads by themselves, they are transported by trailers. When a crawler crane is transported, the crawler crane is disassembled into several parts so that the size of the transported objects that constitute part of the crawler crane falls within the range of transport regulations. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2016-147729 A [Patent Document 2] JP 2016-215744 A [Patent Document 3] JP 2018-39638 A Summary of the Invention [Problem to be solved by the invention]

[0007] In the crawler crane described in Patent Document 1, when the car body and the upper rotating body attached thereto are transported on one trailer, it is difficult to prevent the trailer size from becoming large. Specifically, it is as follows. Since the upper rotating body has a large dimension in the front and rear, the weight of the upper rotating body is inevitably large. In the crawler crane described in Patent Document 1, the car body has a structure in which the left and right crawler traveling devices are connected, so the left and right dimensions of the car body are set to a size corresponding to the distance between the left and right crawler traveling devices. This causes the weight of the car body to become large. Therefore, in the crawler crane described in Patent Document 1, the weight of both the upper rotating body and the car body are large, so it is necessary to use a trailer of a large size that corresponds to these weights for transporting them.

[0008] The crawler cranes described in Patent Documents 2 and 3 each have a structure in which two front jack devices and two rear jack devices are attached to the front axle and the rear axle, respectively, as described above. However, when the upper rotating body and the car body are transported on one trailer and the front and rear axles removed from the car body are transported on another trailer, these jack devices cannot be used for incidental work accompanying the transportation. Specifically, the following is true. In the crawler cranes described in Patent Documents 2 and 3, for example, when incidental work accompanying the transportation is performed, such as loading the car body and the upper rotating body attached thereto onto the trailer, unloading them from the trailer, and attaching the front and rear axles to the car body, the front and rear axles are detached from the car body. Therefore, it is not possible to perform these incidental work while jacking up the car body to which the upper rotating body is attached with four jack devices.

[0009] The present disclosure has been made in consideration of the above-mentioned problems, and aims to provide a crawler crane that can prevent the trailer size from increasing when transporting a car body and its attached upper rotating body on a single trailer, and that can perform ancillary work associated with transportation by utilizing multiple jack devices. [Means for solving the problem]

[0010] The crawler crane provided includes left and right crawler traveling devices arranged at intervals in the left-right direction and extending forward and backward, respectively; a front axle extending in the left-right direction and connecting the left and right crawler traveling devices to each other; a rear axle extending in the left-right direction rearward of the front axle and connecting the left and right crawler traveling devices to each other; a car body arranged between the front axle and the rear axle, the car body having a front portion to which the front axle is detachably connected and a rear portion to which the rear axle is detachably connected; an upper rotating body rotatably attached to the car body; a left front jack device and a right front jack device arranged at intervals in the left-right direction, the left front jack device and the right front jack device each having a front beam extending from a base end connected to the car body and a front leg portion supported by the front beam at a tip end of the front beam and extending up and down; the left rear jack device and the right rear jack device are disposed rearward of the right front jack device and spaced apart from each other in the left-right direction, the left rear jack device and the right rear jack device each having a rear beam extending from a base end connected to the car body and a rear leg portion supported by the rear beam at a tip end of the rear beam and extending up and down, the front axle has a shape that forms a left front space and a right front space in a region between the front axle and the rear axle, the left front jack device and the right front jack device being spaces in which the front leg portion of the left front jack device and the front leg portion of the right front jack device can be disposed, when the left front jack device and the right front jack device are disposed in a diagonal front position where the front beam of the left front jack device and the front beam of the right front jack device extend diagonally forward to the left and diagonally forward to the right from the car body, respectively, and the rear axle isThe left rear jack device and the right rear jack device are arranged in a diagonal rear position where the rear beam of the left rear jack device and the rear beam of the right rear jack device extend diagonally rearward to the left and right from the car body, respectively. The left rear space and the right rear space are formed in the region between the front axle and the rear axle, and are spaces in which the rear leg of the left rear jack device and the rear leg of the right rear jack device can be arranged, respectively.

[0011] In this crawler crane, the front axle has a shape that forms the left front space and the right front space, and the rear axle has a shape that forms the left rear space and the right rear space.Therefore, the front and rear axles that connect the left and right crawler running devices to each other extend in the left-right direction as if lying across the front and rear of the car body, but do not interfere with the positioning of the front and rear legs of the four jack devices connected to the car body.This makes it possible to position the left front jack device and right front jack device connected to the car body in diagonal front positions, and the left rear jack device and right rear jack device connected to the car body in diagonal rear positions, respectively. This makes it possible to perform ancillary work associated with transportation, such as attaching the front and rear axles to the car body while stably jacking up the car body and upper rotating body using two jack devices arranged diagonally forward and two jack devices arranged diagonally rear, and also makes it possible to reduce the left-right dimensions of the car body, which does not require connecting the left and right crawler running devices, thereby preventing the weight of the car body from increasing and the size of the trailer from increasing.

[0012] In the crawler crane, the front axle includes a front axle body that extends in the left-right direction and connects the left and right crawler travel devices to each other, and a front axle overhang that overhangs rearward from the front axle body toward the car body and is detachably connected to the front part of the car body, and the front axle overhang preferably has a shape smaller in the left-right dimension than the front axle body so that the left front space is formed in the area between the left crawler travel device and the front axle overhang, and the right front space is formed in the area between the right crawler travel device and the front axle overhang. In this configuration, the front axle has a shape such that the front axle overhang, which has a smaller left-right dimension than the front axle body, overhangs rearward from the front axle body toward the car body, so that the front axle body can be positioned forward and away from the car body to form the left front space and the right front space on both the left and right sides of the front axle overhang, without extending the car body forward. This makes it possible to form the left front space and the right front space while maintaining the size of the car body compact.

[0013] In the crawler crane, the rear axle includes a rear axle body that extends in the left-right direction and connects the left and right crawler travel devices to each other, and a rear axle overhang that overhangs forward from the rear axle body toward the car body and is detachably connected to the rear of the car body, and the rear axle overhang preferably has a shape smaller in the left-right dimension than the rear axle body so that the left rear space is formed in the area between the left crawler travel device and the rear axle overhang, and the right rear space is formed in the area between the right crawler travel device and the rear axle overhang. In this configuration, the rear axle has a shape such that the rear axle overhang, which has a smaller left-right dimension than the rear axle body, overhangs forward from the rear axle body toward the car body, so that the rear axle body can be positioned rearward away from the car body to form the left and right rear spaces on both the left and right sides of the rear axle overhang without extending the car body rearward. This makes it possible to form the left rear space and the right rear space while maintaining the size of the car body compact.

[0014] In the crawler crane, each of the left front jack device and the right front jack device is configured to be able to rotate relative to the car body around the base end of the front beam to be displaced from the diagonal front position to a front storage position, and it is preferable that the front storage position of the left front jack device and the front storage position of the right front jack device are positions such that the front beam of the left front jack device and the front beam of the right front jack device extend forward or diagonally forward from the car body so that the left-right distance between the front leg of the left front jack device and the front leg of the right front jack device is smaller than when the left front jack device and the right front jack device are disposed at the diagonal front position. In this configuration, when each of the left front jack device and the right front jack device is positioned in the front storage position, these front beams are positioned so that they extend from their base ends in a direction away from the rear beam, so that even though both the front beam and the rear beam are connected to a compact car body, the left front jack device and the right front jack device can be displaced from the diagonal front position to the front storage position while avoiding the front beam coming into contact with the rear beam.

[0015] In the crawler crane, each of the left rear jack device and the right rear jack device is configured to be able to rotate relative to the car body around the base end of the rear beam to be displaced from the diagonal rear position to a rear storage position, and it is preferable that the rear storage position of the left rear jack device and the rear storage position of the right rear jack device are positions such that the rear beam of the left rear jack device and the rear beam of the right rear jack device extend rearward or diagonally rearward from the car body, respectively, so that the left-right distance between the rear legs of the left rear jack device and the rear legs of the right rear jack device is smaller than when the left rear jack device and the right rear jack device are disposed at the diagonal rear position. In this configuration, when each of the left rear jack device and the right rear jack device is positioned in the rear storage position, these rear beams are positioned so that they extend from their base ends in a direction away from the front beam, so that even though both the front beam and the rear beam are connected to a compact car body, the left rear jack device and the right rear jack device can be displaced from the diagonal rear position to the rear storage position while avoiding the rear beam coming into contact with the front beam. Effect of the Invention

[0016] According to the present disclosure, a crawler crane is provided that can prevent the trailer size from increasing when transporting a car body and its attached upper rotating body on a single trailer, and that can perform ancillary work associated with transportation by utilizing four jack devices. [Brief description of the drawings]

[0017] [Figure 1] FIG. 1 is a side view illustrating a crawler crane according to an embodiment of the present disclosure. [Diagram 2] FIG. 2 is a plan view showing the car body, front axle, rear axle, left and right crawler travelling devices, and four jack devices of the crawler crane. [Diagram 3] FIG. 2 is a side view showing the carbody, the front axle, the rear axle, and two jack devices. [Figure 4] FIG. 4 is a plan view for explaining an arrangement of the four jack devices relative to the carbody. [Diagram 5] FIG. 4 is a schematic diagram for explaining an example of incidental work accompanying transportation of the crawler crane. [Figure 6] FIG. 4 is a schematic diagram for explaining an example of incidental work accompanying transportation of the crawler crane. [Figure 7] FIG. 4 is a schematic diagram for explaining an example of incidental work accompanying transportation of the crawler crane. [Figure 8] FIG. 4 is a schematic diagram for explaining an example of incidental work accompanying transportation of the crawler crane. [Figure 9] FIG. 4 is a schematic diagram for explaining an example of incidental work accompanying transportation of the crawler crane. [Figure 10] FIG. 2 is a plan view showing a car body, a front axle, a rear axle, left and right crawler travelling devices, and four jack devices in a crawler crane according to a first modified example of the embodiment. [Figure 11] FIG. 11 is a plan view showing a car body, a front axle, a rear axle, left and right crawler travelling devices, and four jack devices in a crawler crane according to a second modified example of the embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] Hereinafter, a crawler crane according to an embodiment of the present disclosure will be described with reference to the drawings.

[0019] As shown in FIGS. 1 and 2, the crawler crane 100 includes a lower traveling body 10, an upper rotating body 50, a plurality of jack devices, a hoisting member 70, and a hoisting device 90.

[0020] The upper rotating body 50 is supported by the lower running body 10 so as to be rotatable about a vertical axis (central rotating axis A shown in FIG. 2) extending in the up-down direction. The upper rotating body 50 includes a rotating main body 51 including a rotating frame attached to the lower running body 10, a cabin 52 supported on the front of the rotating main body 51, a counterweight 53 attached to the rear of the rotating main body 51, a box mast 54 supported on the rotating main body 51 so as to be rotatable about an axis extending in the horizontal direction, a hoisting rope 55, guy lines 56, and a hoisting winch device 57.

[0021] The hoisting member 70 includes a boom 71 supported on the revolving body 51 of the upper revolving body 50 so as to be able to be raised and lowered about an axis extending in a horizontal direction perpendicular to the longitudinal direction of the revolving body 51. The hoisting member 70 may further include a jib (not shown) rotatably connected to the tip of the boom 71. The hoisting device 90 is suspended from the tip of the hoisting member 70 via a rope. The hoisting device 90 is raised and lowered by a hoisting winch device 58 which can wind up or pay out the rope.

[0022] The box mast 54 is supported by the revolving main body 51 of the upper rotating body 50 so as to be rotatable in the same direction as the raising and lowering direction of the boom 71. A pair of guy lines 56 are arranged along the left-right direction. The guy lines 56 connect the tip of the box mast 54 to the upper end of the boom 71. The hoisting rope 55 is wound multiple times between a sheave block including multiple sheaves arranged on the revolving main body 51 of the upper rotating body 50 and a sheave block including multiple sheaves arranged at the tip of the box mast 54.

[0023] The hoisting winch device 57 is disposed near the box mast 54. The hoisting winch device 57 winds and pays out the hoisting rope 55. The winding and paying out operation of the hoisting winch device 57 changes the distance between the sheave block disposed at the tip of the box mast 54 and the sheave block disposed at the revolving main body 51 of the upper rotating body 50, and the box mast 54 and the boom 71 rotate integrally with respect to the revolving main body 51. The rotation of the box mast 54 is performed, for example, during incidental work accompanying the transportation of the crawler crane 100 described below, and when the crawler crane 100 is in use (when performing lifting work), the position of the box mast 54 (the angle of the upper rotating body 50 relative to the revolving main body 51) is substantially fixed.

[0024] The lower traveling body 10 is a crawler type traveling body capable of self-propelling on the ground. As shown in Figures 2 and 3, the lower traveling body 10 includes a car body 20, a front axle 30A, a rear axle 30B, and left and right crawler traveling devices 40L, 40R. The directions of "up", "down", "front", "rear", "left", and "right" shown in the drawings are based on the orientation of the lower traveling body 10. The direction in which each of the left and right crawler traveling devices 40L, 40R extends is the front-rear direction, and the horizontal direction perpendicular to the front-rear direction is the left-right direction.

[0025] The left and right crawler traveling devices 40L, 40R are arranged at a distance in the left-right direction and have a shape that extends in the front-rear direction. The left and right crawler traveling devices 40L, 40R have the same structure except that they have a symmetrical structure. Therefore, one of the crawler traveling devices will be mainly described below. As shown in FIG. 2, the crawler traveling device includes a crawler frame 41 extending in the front-rear direction, front and rear wheels (not shown) rotatably supported at the front and rear ends of the crawler frame 41, a crawler belt 42 that is annularly hung on these wheels and can move around, and a drive device (not shown) that drives one of the front and rear wheels. The crawler belt 42 is formed in a ring shape by connecting a number of crawler shoes. The drive device includes, for example, a motor and a reducer (not shown). The drive device drives one of the wheels, causing the crawler belt 42 to move around. In FIG. 2, the crawler belts 42, 42 of the left and right crawler traveling devices 40L, 40R are respectively drawn by dashed lines.

[0026] The front axle 30A extends in the left-right direction and connects the crawler frames 41, 41 of the left and right crawler traveling devices 40L, 40R to each other. The left end of the front axle 30A is connected to a portion of the left crawler frame 41 that is forward of the center in the front-to-rear direction, and the right end of the front axle 30A is connected to a portion of the right crawler frame 41 that is forward of the center in the front-to-rear direction.

[0027] The rear axle 30B extends in the left-right direction behind the front axle 30A and connects the crawler frames 41, 41 of the left and right crawler traveling devices 40L, 40R to each other. The left end of the rear axle 30B is connected to a portion of the left crawler frame 41 rearward of the center in the front-to-rear direction, and the right end of the rear axle 30B is connected to a portion of the right crawler frame 41 rearward of the center in the front-to-rear direction.

[0028] The car body 20 is disposed between the front axle 30A and the rear axle 30B. The car body 20 has a smaller dimension in the left-right direction than the front axle 30A and the rear axle 30B. The car body 20 includes a car body main body 21 having a rectangular shape in a plan view, a turning device 22 disposed on the upper part of the car body main body 21, front connecting parts 23F, 23F disposed on the front part of the car body main body 21, and rear connecting parts 23R, 23R disposed on the rear part of the car body main body 21. The front connecting parts 23F, 23F are an example of the front part of the car body 20, and are parts to which the front axle 30A is connected. The rear connecting parts 23R, 23R are an example of the rear part of the car body 20, and are parts to which the rear axle 30B is connected.

[0029] An upper rotating body 50 is rotatably attached to the car body 20. The rotating device 22 includes an outer circle, an inner circle, and a rotating motor. One of the outer circle and the inner circle is fixed to the car body main body 21, and the other is fixed to a rotating frame of the upper rotating body 50. A rotating gear is formed on the inner circle, and this rotating gear is engaged with a pinion rotated by the rotating motor. The inner circle is rotated relative to the outer circle by the rotating motor, whereby the upper rotating body 50 rotates relative to the lower running body 10 around the rotating central axis A shown in FIG. 2.

[0030] The multiple jack devices include a left front jack device 60FL arranged diagonally forward and to the left of the rotation center axis A, a right front jack device 60FR arranged diagonally forward and to the right of the rotation center axis A, a left rear jack device 60RL arranged diagonally rear and to the left of the rotation center axis A, and a right rear jack device 60RR arranged diagonally rear and to the right of the rotation center axis A.

[0031] The left front jack device 60FL and the right front jack device 60FR are arranged at a distance from each other in the left-right direction. Each of the left front jack device 60FL and the right front jack device 60FR has a beam 61 and a leg portion 62. The beam 61 of each of the left front jack device 60FL and the right front jack device 60FR is an example of a front beam, has a base end portion 611 connected to the car body main body 21 of the car body 20 and a tip end portion 612 on the opposite side, and has a shape that extends obliquely forward from the base end portion 611 to the tip end portion 612. Each of the legs 62 of the left front jack device 60FL and the right front jack device 60FR is an example of a front leg portion, and is supported by the beam 61 at the tip end portion 612 of the beam 61 and extends up and down. The legs 62 of the left front jack device 60FL and the right front jack device 60FR each have a leg body including a cylinder device that is vertically extendable and contractible, for example, by a hydraulic mechanism, and a seat 63 attached to the lower end of the leg body, and the length in the vertical direction can be changed. The seat 63 has a larger area in a plan view than the leg body.

[0032] The left rear jack device 60RL and the right rear jack device 60RR are arranged at a distance from each other in the left-right direction behind the left front jack device 60FL and the right front jack device 60FR. Each of the left rear jack device 60RL and the right rear jack device 60RR has a beam 61 and a leg portion 62. The beam 61 of each of the left rear jack device 60RL and the right rear jack device 60RR is an example of a rear beam, has a base end portion 611 connected to the car body main body 21 of the car body 20 and a tip end portion 612 on the opposite side, and has a shape that extends obliquely rearward from the base end portion 611 to the tip end portion 612. Each of the legs 62 of the left rear jack device 60RL and the right rear jack device 60RR is an example of a rear leg portion, and is supported by the beam 61 at the tip end portion 612 of the beam 61 and extends up and down. The legs 62 of the left rear jack device 60RL and the right rear jack device 60RR each have a leg body including a cylinder device that is vertically extendable and contractible, for example, by a hydraulic mechanism, and a seat 63 attached to the lower end of the leg body, and the length in the vertical direction can be changed. The seat 63 has a larger area in a plan view than the leg body.

[0033] As shown in FIG. 2, the base end 611 of the beam 61 of the left front jack device 60FL is connected to a portion forward of the pivot axis A at the left end of the car body main body 21 so as to be rotatable around a pivot axis extending in the vertical direction. The base end 611 of the beam 61 of the right front jack device 60FR is connected to a portion forward of the pivot axis A at the right end of the car body main body 21 so as to be rotatable around a pivot axis extending in the vertical direction. The base end 611 of the beam 61 of the left rear jack device 60RL is connected to a portion rearward of the pivot axis A at the left end of the car body main body 21 so as to be rotatable around a pivot axis extending in the vertical direction. The base end 611 of the beam 61 of the right rear jack device 60RR is connected to a portion rearward of the pivot axis A at the right end of the car body main body 21 so as to be rotatable around a pivot axis extending in the vertical direction.

[0034] For example, the base end 611 of the beam 61 of the right front jack device 60FR has a vertical insertion hole, and the car body main body 21 has a vertical insertion hole at a position corresponding to the insertion hole of the beam 61. By arranging pins 613 shown in Fig. 3 in these insertion holes, the beam 61 is supported by the car body 20 so as to be rotatable around the base end 611. The rotation structures of the other three jack devices 60FL, 60RL, 60RR are also similar to that of the right front jack device 60FR.

[0035] As shown in Fig. 4, each of the left front jack device 60FL and the right front jack device 60FR can be displaced between a diagonal front position P1 and a front storage position P2 by rotating around the base end portion 611 of the beam 61. Each of the left rear jack device 60RL and the right rear jack device 60RR can be displaced between a diagonal rear position P1 and a rear storage position P2 by rotating around the base end portion 611 of the beam 61. The rotation of the four jack devices 60FL, 60FR, 60RL, and 60RR may be performed by an actuator such as a hydraulic cylinder (not shown), or may be performed manually by an operator. Each jack device may be configured to be positionable by a positioning mechanism at each of the diagonal front position P1 and the front storage position P2. An example of the positioning mechanism is a pin inserted into a pin hole provided in each of the beams 61 of the four jack devices 60FL, 60FR, 60RL, and 60RR and a pin hole provided in the car body main body 21, but the positioning mechanism is not limited to this form.

[0036] The diagonal front position P1 of the left front jack device 60FL is a position where the beam 61 of the left front jack device 60FL extends diagonally forward to the left from the left end of the car body main body 21. The diagonal front position P1 of the right front jack device 60FR is a position where the beam 61 of the right front jack device 60FR extends diagonally forward to the right from the right end of the car body main body 21. The diagonal rear position P1 of the left rear jack device 60RL is a position where the beam 61 of the left rear jack device 60RL extends diagonally rear to the left from the left end of the car body main body 21. The diagonal rear position P1 of the right rear jack device 60RR is a position where the beam 61 of the right rear jack device 60RR extends diagonally rear to the right from the right end of the car body main body 21.

[0037] The front storage position P2 of the left front jack device 60FL and the front storage position P2 of the right front jack device 60FR are positions where the beam 61 of the left front jack device 60FL and the beam 61 of the right front jack device 60FR extend forward from the car body main body 21. The left-right distance between the legs 62 of the left front jack device 60FL and the right front jack device 60FR arranged in the front storage position P2 is smaller than the state where the left front jack device 60FL and the right front jack device 60FR are arranged in the diagonally front position P1. The rear storage position P2 of the left rear jack device 60RL and the rear storage position P2 of the right rear jack device 60RR are positions where the beam 61 of the left rear jack device 60RL and the beam 61 of the right rear jack device 60RR extend rearward from the car body main body 21. The left-right distance between the legs 62 of the left rear jack apparatus 60RL and the right rear jack apparatus 60RR arranged in the rear storage position P2 is smaller than when the left rear jack apparatus 60RL and the right rear jack apparatus 60RR are arranged in the diagonally rear position P1.

[0038] 2 and 3, the front axle 30A includes an axle body 31 (an example of a front axle body) that extends in the left-right direction and connects the left and right crawler traveling devices 40L, 40R to each other, an axle extension 32 (an example of a front axle extension) that extends rearward from the axle body 31 toward the car body 20, and connection parts 33, 33 that detachably connect the axle extension 32 to the car body 20. That is, the axle extension 32 of the front axle 30A is a part that is detachably connected to the front part of the car body 20 via the connection parts 33, 33. The connection parts 33, 33 of the front axle 30A are arranged at positions corresponding to the front connection parts 23F, 23F of the car body 20.

[0039] Similarly, the rear axle 30B includes an axle body 31 (an example of a rear axle body) that extends in the left-right direction and connects the left and right crawler traveling devices 40L, 40R to each other, an axle overhang 32 (an example of a rear axle overhang) that overhangs forward from the axle body 31 toward the car body 20, and connection parts 33, 33 that detachably connect the axle overhang 32 to the car body 20. That is, the axle overhang 32 of the rear axle 30B is a part that is detachably connected to the rear part of the car body 20 via the connection parts 33, 33. The connection parts 33, 33 of the rear axle 30B are disposed at positions corresponding to the rear connection parts 23R, 23R of the car body 20.

[0040] Each of the connection parts 33, 33 of the front axle 30A includes a pair of protruding pieces protruding rearward from the rear part of the axle overhang 32 of the front axle 30A. Each of the front connection parts 23F, 23F of the car body 20 includes a protruding piece protruding forward from the front part of the car body main body 21. The pair of protruding pieces of the connection part 33 of the front axle 30A are arranged with a gap in the left-right direction, and the protruding piece of the front connection part 23F of the car body 20 is inserted into this gap. A rod-shaped member 81 extending between the pair of protruding pieces of the connection part 33 of the front axle 30A is joined to the upper part of the pair of protruding pieces, and a notch 82 into which the rod-shaped member 81 can fit is formed at the upper part of the protruding piece of the front connection part 23F of the car body 20. Each protruding piece is provided with a through hole. The rod-shaped member 81 is placed in the notch 82, and a pin 80 is inserted into these through holes with the through holes aligned with each other. This connects the front axle 30A to the car body 20. The pin 80 is pulled out of the through hole, allowing the front axle 30A to be removed from the car body 20. The structure of the connection parts 33, 33 of the rear axle 30B and the structure of the rear connection parts 23R, 23R of the car body 20 are similar to the connection parts 33, 33 of the front axle 30A and the front connection parts 23F, 23F of the car body 20 described above.

[0041] 2, the front axle 30A has a shape that forms a left front space S1 and a right front space S2 in the region between the front axle 30A and the rear axle 30B in which the leg 62 of the left front jack device 60FL and the leg 62 of the right front jack device 60FR can be disposed when the left front jack device 60FL and the right front jack device 60FR are disposed in the diagonal front position P1. Similarly, the rear axle 30B has a shape that forms a left rear space S3 and a right rear space S4 in the region between the front axle 30A and the rear axle 30B in which the leg 62 of the left rear jack device 60RL and the leg 62 of the right rear jack device 60RR can be disposed when the left rear jack device 60RL and the right rear jack device 60RR are disposed in the diagonal rear position P1.

[0042] Specifically, it is as follows. The axle body 31 of the front axle 30A and the axle body 31 of the rear axle 30B each have a shape (rectangular in plan view) that extends linearly as shown in FIG. 2, for example. The axle overhang 32 of the front axle 30A and the axle overhang 32 of the rear axle 30B each have a box shape that is rectangular in plan view as shown in FIG. 2 and FIG. 3, for example, but the shape of these axle overhangs 32 is not limited to the specific example shown in FIG. 2 and FIG. 3. The left-right center of the axle overhang 32 of the front axle 30A approximately coincides with the left-right center of the axle body 31 of the front axle 30A, and the left-right center of the axle overhang 32 of the rear axle 30B approximately coincides with the left-right center of the axle body 31 of the rear axle 30B, but the positions of the centers may be slightly shifted in the left-right direction.

[0043] The axle overhang 32 of the front axle 30A has a smaller left-right dimension than the axle body 31 of the front axle 30A so that a left front space S1 is formed in the area between the left crawler travelling device 40L and the axle overhang 32 of the front axle 30A, and a right front space S2 is formed in the area between the right crawler travelling device 40R and the axle overhang 32 of the front axle 30A. The axle overhang 32 of the rear axle 30B has a smaller left-right dimension than the axle body 31 of the rear axle 30B so that a left rear space S3 is formed in the area between the left crawler travelling device 40L and the axle overhang 32 of the rear axle 30B, and a right rear space S4 is formed in the area between the right crawler travelling device 40R and the axle overhang 32 of the rear axle 30B. Each space S is a part surrounded by a two-dot chain line rectangle in FIG. 2.

[0044] In the specific example shown in Figure 2, the left-right dimension of the axle extension portion 32 of the front axle 30A and the rear axle 30B is approximately the same as the left-right dimension of the car body main body 21 of the car body 20, but may be smaller than the left-right dimension of the car body main body 21 or may be larger than the left-right dimension of the car body main body 21.

[0045] The left front space S1 is formed in front of the car body main body 21 and to the left of the turning central axis A. The right front space S2 is formed in front of the car body main body 21 and to the right of the turning central axis A. The left rear space S3 is formed behind the car body main body 21 and to the left of the turning central axis A. The right rear space S4 is formed behind the car body main body 21 and to the right of the turning central axis A.

[0046] The left front space S1 may be formed in front of the car body 20 and to the left of the car body 20, the right front space S2 may be formed in front of the car body 20 and to the right of the car body 20, the left rear space S3 may be formed behind the car body 20 and to the left of the car body 20, and the right rear space S4 may be formed behind the car body 20 and to the right of the car body 20.

[0047] When the left front jack device 60FL and the right front jack device 60FR are disposed in the diagonal front position P1, the leg 62 of the left front jack device 60FL is disposed in an area occupying at least a part of the left front space S1, and the leg 62 of the right front jack device 60FR is disposed in an area occupying at least a part of the right front space S2. Similarly, when the left rear jack device 60RL and the right rear jack device 60RR are disposed in the diagonal rear position P1, the leg 62 of the left rear jack device 60RL is disposed in an area occupying at least a part of the left rear space S3, and the leg 62 of the right rear jack device 60RR is disposed in an area occupying at least a part of the right rear space S4.

[0048] In the crawler crane 100 of this embodiment, the front axle 30A has a shape that forms a left front space S1 and a right front space S2, and the rear axle 30B has a shape that forms a left rear space S3 and a right rear space S4, so that the left front jack device 60FL and the right front jack device 60FR connected to the car body 20 can be respectively positioned at the diagonal front position P1, and the left rear jack device 60RL and the right rear jack device 60RR connected to the car body 20 can be respectively positioned at the diagonal rear position P1. This makes it possible to stably jack up the car body 20 and upper rotating body 50 using two jack devices 60FL, 60FR arranged at the diagonal front position P1 and two jack devices 60RL, 60RR arranged at the diagonal rear position P1, while performing ancillary work associated with transportation, and also makes it possible to reduce the left-right dimensions of the car body 20, which does not need to be connected to the left and right crawler running devices 40L, 40R, thereby preventing the weight of the car body 20 from increasing and preventing the size of the trailer from increasing.

[0049] In this embodiment, the front axle 30A has a shape in which the axle extension 32, which has a smaller dimension in the left-right direction than the axle body 31, extends rearward from the axle body 31 toward the car body 20, so that the axle body 31 can be positioned forward and away from the car body 20 to form a left front space S1 and a right front space S2 on both the left and right sides of the axle extension 32 without extending the car body 20 forward. This makes it possible to form the left front space S1 and the right front space S2 while maintaining the size of the car body 20 compact.

[0050] In this embodiment, the rear axle 30B has a shape in which the axle extension 32, which has a smaller left-right dimension than the axle body 31, extends forward from the axle body 31 toward the car body 20, so that the axle body 31 can be positioned rearward away from the car body 20 to form a left rear space S3 and a right rear space S4 on both the left and right sides of the axle extension 32 without extending the car body 20 rearward. This makes it possible to form the left rear space S3 and the right rear space S4 while maintaining the size of the car body 20 compact.

[0051] In this embodiment, when each of the left front jack device 60FL and the right front jack device 60FR is disposed in the front storage position P2, the beams 61 are disposed so as to extend from the base end portion 611 in a direction away from the beam 61 of the left rear jack device 60RL and the beam 61 of the right rear jack device 60RR. As a result, even though the beams 61 of the four jack devices 60FL, 60FR, 60RL, and 60RR are connected to the compact car body 20, the left front jack device 60FL and the right front jack device 60FR can be displaced from the diagonally front position P1 to the front storage position P2 while avoiding the beams 61 of the left front jack device 60FL and the right front jack device 60FR coming into contact with the beams 61 of the left rear jack device 60RL and the right rear jack device 60RR.

[0052] In this embodiment, when each of the left rear jack device 60RL and the right rear jack device 60RR is disposed in the rear storage position P2, the beams 61 are disposed so as to extend from the base end portion 611 in a direction away from the beam 61 of the left front jack device 60FL and the beam 61 of the right front jack device 60FR. As a result, even though the beams 61 of the four jack devices 60FL, 60FR, 60RL, and 60RR are connected to the compact car body 20, the left rear jack device 60RL and the right rear jack device 60RR can be displaced from the oblique rear position P1 to the rear storage position P2 while avoiding the beams 61 of the left rear jack device 60RL and the right rear jack device 60RR from coming into contact with the beams 61 of the left front jack device 60FL and the right front jack device 60FR.

[0053] By positioning each of the four jack devices 60FL, 60FR, 60RL, and 60RR in the storage position P2, the width of the object to be transported, including the car body 20, the upper rotating body 50, and the four jack devices 60FL, 60FR, 60RL, and 60RR, can be kept within the range of the regulatory values ​​related to transportation.

[0054] In this embodiment, the front axle 30A and the rear axle 30B connect the left and right crawler travelling devices 40L, 40R to each other, so that the distance (front-rear distance) between the part of each of the crawler travelling devices 40L, 40R to which the front axle 30A is connected and the part to which the rear axle 30B is connected can be increased. This is advantageous in terms of the strength of the crawler frame 41, and the crawler frame 41 can be made lighter. In addition, since the crawler crane 100 includes the front axle 30A and the rear axle 30B, a carbody weight can be omitted. Even if a carbody weight is required, the carbody weight can be made small.

[0055] [Transportation-related work] 5 to 9 are schematic diagrams for explaining an example of incidental work accompanying the transportation of the crawler crane 100. The incidental work explained below includes the work of unloading the object to be transported from the trailer 110, and the work of attaching the front axle 30A, the rear axle 30B, and the left and right crawler traveling devices 40L, 40R to the car body 20. The object to be transported includes the car body 20, at least a part of the upper rotating body 50, and the four jack devices 60FL, 60FR, 60RL, 60RR.

[0056] 5 shows a state in which the object to be transported is loaded onto the trailer 110. The trailer 110 includes a cabin 111 having a seat for a driver and the like, and a loading platform 112 connected to the rear of the cabin 111. The object to be transported is placed on the loading platform 112. When the object to be transported is transported by the trailer 110, the four jack devices 60FL, 60FR, 60RL, 60RR are arranged in the storage position P2.

[0057] Fig. 6 shows a state where the trailer 110 arrives at a destination such as a work site and the associated work is started. In this associated work, the four jack devices 60FL, 60FR, 60RL, and 60RR are first moved from the storage position P2 to the diagonal position P1, and then the legs 62 of each jack device 60 are extended so that the seat 63 of the legs 62 touches the ground, and the car body 20 and the upper rotating body 50 are lifted up from the loading platform 112 of the trailer 110. In this state, the trailer 110 moves forward, and the transport object is unloaded from the trailer 110. In the specific example shown in Figs. 5 and 6, the transport object of the trailer 110 includes the car body 20, the rotating main body 51 and the box mast 54 of the upper rotating body 50, and the four jack devices 60FL, 60FR, 60RL, and 60RR. However, the box mast 54 does not have to be included in the object to be transported. In this case, the object to be transported may be transported to a destination by a trailer 110 with the box mast 54 detached from the rotating main body 51, and after the object to be transported is unloaded from the trailer 110 at the destination, the box mast 54 may be attached to the rotating main body 51.

[0058] FIG. 7 shows the work of attaching the front axle 30A to the carbody 20, and FIG. 8 shows the work of attaching the crawler travelling device 40L to the carbody 20. These works are performed by adjusting the orientation of the upper rotating body 50 relative to the carbody 20, while the carbody 20 and the upper rotating body 50 are supported by the four jacking devices 60FL, 60FR, 60RL, and 60RR, using the box mast 54 and the hoisting rope 55. When these works are completed, the legs 62 of the four jacking devices 60FL, 60FR, 60RL, and 60RR are contracted as shown in FIG. 9, so that the left and right crawler travelling devices 40L and 40R are placed on the ground. The transport object of the trailer 110 may further include the cabin 52 of the upper rotating body 50. In this case, with the cabin 52 supported on the swivel main body 51, the object to be transported is transported to the destination by the trailer 110 as shown in Figure 5, and with the cabin 52 supported on the swivel main body 51, work is carried out to attach the front axle 30A and the left and right crawler running devices 40L, 40R to the car body 20 as shown in Figures 7 and 8.

[0059] The present disclosure is not limited to the above-described embodiment. The present disclosure includes, for example, the following aspects.

[0060] (A) Shape of front and rear axles In the above embodiment, the axle body 31 of the front axle 30A and the rear axle 30B has a shape that extends linearly in the left-right direction (rectangular in plan view), and the axle overhang 32 that overhangs from the axle body 31 of the front axle 30A and the rear axle 30B has a rectangular shape in plan view, but the shapes of the axle body 31 and the axle overhang 32 are not limited to those in the above embodiment. The axle body 31 may include, for example, a curved portion. The axle overhang 32 may have a trapezoidal shape in plan view, as shown in FIG. 10, for example. The axle overhang 32 may also include multiple portions that are spaced apart from each other in the left-right direction, as shown in FIG. 11, for example.

[0061] (B) Jacking device In the above embodiment, each jack device 60 is configured to be capable of being displaced between the diagonal position P1 and the storage position P2, but it may be fixed at the diagonal position P1 if the width of the object to be transported can be kept within the range of the regulatory values ​​for transportation even when placed at the diagonal position P1.

[0062] Furthermore, in the above embodiment, when the left front jack device 60FL and the right front jack device 60FR are positioned in the storage position P2, these beams 61 are positioned so as to extend from the base end portion 611 in a direction away from the beam 61 of the left rear jack device 60RL and the beam 61 of the right rear jack device 60RR, respectively, but they may also be positioned so as to extend from the base end portion 611 in a direction approaching the beam 61 of the left rear jack device 60RL and the beam 61 of the right rear jack device 60RR. Similarly, in the above embodiment, when the left rear jack device 60RL and the right rear jack device 60RR are positioned in the storage position P2, these beams 61 are positioned so as to extend from the base end portion 611 in a direction away from the beam 61 of the left front jack device 60FL and the beam 61 of the right front jack device 60FR, respectively, but they may also be positioned so as to extend from the base end portion 611 in a direction approaching the beam 61 of the left front jack device 60FL and the beam 61 of the right front jack device 60FR.

[0063] In the above embodiment, the front storage position P2 of the left front jack device 60FL and the front storage position P2 of the right front jack device 60FR are positions where the beam 61 of the left front jack device 60FL and the beam 61 of the right front jack device 60FR each extend forward from the car body 20, but these front storage positions P2 may also be positions where the beam 61 of the left front jack device 60FL and the beam 61 of the right front jack device 60FR each extend diagonally forward from the car body 20. Similarly, in the above embodiment, the rear storage position P2 of the left rear jack apparatus 60RL and the rear storage position P2 of the right rear jack apparatus 60RR are positions where the beam 61 of the left rear jack apparatus 60RL and the beam 61 of the right rear jack apparatus 60RR each extend rearward from the car body 20, but these rear storage positions P2 may also be positions where the beam 61 of the left rear jack apparatus 60RL and the beam 61 of the right rear jack apparatus 60RR each extend diagonally rearward from the car body 20. [Explanation of symbols]

[0064] 20: Car body 21: Car body 23F: Front connection part (example of the front part of a car body) 23R: Rear connection part (example of the rear part of a car body) 30A: Front axle 30B: Rear axle 31: Axle body 32: Axle extension 40L: Left crawler running gear 40R: Right crawler running gear 50: Upper rotating body 60FL: Left front jack device 60FR: Right front jack device 60RL: Left rear jack device 60RR: Right rear jack device 61: Beam 611: Base end of beam 612: Tip of beam 62: Legs 100: Crawler crane P1: Diagonal front position, diagonal rear position P2: Front storage position, rear storage position S1: Left front space S2: Right front space S3: Left rear space S4: Right rear space

Claims

1. A crawler crane, Left and right crawler travel devices are arranged at intervals in the left-right direction and extend forward and backward, respectively; a front axle extending in the left-right direction and connecting the left and right crawler traveling devices to each other; a rear axle extending in the left-right direction rearward of the front axle and connecting the left and right crawler traveling devices to each other; a car body disposed between the front axle and the rear axle, the car body having a front portion to which the front axle is detachably connected and a rear portion to which the rear axle is detachably connected; An upper rotating body rotatably attached to the car body; a left front jack device and a right front jack device arranged at an interval from each other in the left-right direction, each of which has a front beam extending from a base end connected to the car body and a front leg portion supported by the front beam at a tip end of the front beam and extending up and down; a left rear jack device and a right rear jack device disposed rearward of the left front jack device and the right front jack device and spaced apart from each other in the left-right direction, the left rear jack device and the right rear jack device each having a rear beam extending from a base end connected to the car body and a rear leg portion supported by the rear beam at a tip end of the rear beam and extending up and down, the front axle has a shape that forms a left front space and a right front space in a region between the front axle and the rear axle, the left front jack device and the right front jack device being spaces in which the front leg portion of the left front jack device and the front leg portion of the right front jack device can be disposed, respectively, when the left front jack device and the right front jack device are disposed in a diagonal front position in which the front beam of the left front jack device and the front beam of the right front jack device extend diagonally forward to the left and diagonally forward to the right from the car body, the rear axle has a shape that forms a left rear space and a right rear space in a region between the front axle and the rear axle, the left rear jack device and the right rear jack device being spaces in which the rear leg portion of the left rear jack device and the rear leg portion of the right rear jack device can be disposed, respectively, when the left rear jack device and the right rear jack device are disposed in a diagonally rear position in which the rear beam of the left rear jack device and the rear beam of the right rear jack device extend diagonally rearward to the left and right from the car body, The base end of the front beam of the left front jack device is connected to a left side portion of the car body rearward of the front portion of the car body, The base end of the front beam of the right front jack device is connected to a right side portion of the car body rearward of the front portion of the car body, The base end of the rear beam of the left rear jack device is connected to a left side portion of the car body forward of the rear portion of the car body, The base end of the rear beam of the right rear jack device is connected to a right side portion of the car body forward of the rear portion of the car body, A crawler crane, wherein the carbody is supported by the front axle connected to the front of the carbody and the rear axle connected to the rear of the carbody.

2. 2. The crawler crane according to claim 1, The front axle is A front axle body that extends in the left-right direction and connects the left and right crawler traveling devices to each other; a front axle protrusion portion that protrudes rearward from the front axle main body toward the car body and is detachably connected to the front portion of the car body; a front axle extension having a shape whose dimension in the left-right direction is smaller than that of the front axle body, so that the left front space is formed in the area between the left crawler running device and the front axle extension, and the right front space is formed in the area between the right crawler running device and the front axle extension.

3. A crawler crane according to claim 1 or 2, The rear axle is a rear axle body that extends in the left-right direction and connects the left and right crawler traveling devices to each other; a rear axle protrusion portion that protrudes forward from the rear axle main body toward the car body and is detachably connected to the rear portion of the car body, a crawler crane, wherein the rear axle extension has a shape whose dimension in the left-right direction is smaller than that of the rear axle body, so that the left rear space is formed in the area between the left crawler running device and the rear axle extension, and the right rear space is formed in the area between the right crawler running device and the rear axle extension.

4. A crawler crane according to any one of claims 1 to 3, Each of the left front jack device and the right front jack device is configured to be able to rotate relative to the car body around the base end of the front beam and be displaced from the diagonal front position to a front storage position, The front storage positions of the left front jack device and the right front jack device are positions such that the front beam of the left front jack device and the front beam of the right front jack device extend forward or diagonally forward from the car body, respectively, so that the left-right distance between the front leg of the left front jack device and the front leg of the right front jack device is smaller than when the left front jack device and the right front jack device are positioned in the diagonal front position.

5. A crawler crane according to any one of claims 1 to 4, Each of the left rear jack device and the right rear jack device is configured to be able to rotate relative to the car body around the base end of the rear beam and be displaced from the oblique rear position to a rear storage position, The rear storage positions of the left rear jack device and the right rear jack device are positions such that the rear beam of the left rear jack device and the rear beam of the right rear jack device extend rearward or diagonally rearward from the car body, respectively, so that the left-right distance between the rear legs of the left rear jack device and the rear legs of the right rear jack device is smaller than when the left rear jack device and the right rear jack device are disposed in the diagonal rear position.

Images