JP7632094B2 - Crawler Crane - Google Patents

Description

This disclosure relates to a crawler crane.

A crawler crane comprises a lower running body, an upper rotating body supported for rotation on the lower running body, a hoisting member including a boom supported on the upper rotating body for elevation, and multiple jack devices (multiple translifters).

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.

In the crawler cranes described in Patent Document 2 and Patent Document 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.

Crawler cranes cannot move on public roads by themselves, so they are transported by trailer. When a crawler crane is transported, it is disassembled into several parts so that the size of the objects that make up part of the crawler crane falls within the transport regulations.

JP 2016-147729 A JP 2016-215744 A JP 2018-39638 A

In the crawler crane described in Patent Document 1, when the car body and the upper rotating body attached to it are transported on a single trailer, it is difficult to prevent the trailer size from becoming large. Specifically, the following is true. Since the upper rotating body has a large front-to-rear dimension, 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 that connects the left and right crawler traveling devices, so the left-right dimension of the car body is set to a size that corresponds 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.

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 and rear axles, 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 associated with the transportation. Specifically, the following is true. With the crawler cranes described in Patent Documents 2 and 3, for example, when incidental work associated with 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.

This disclosure was made in light of the above problems, and aims to provide a crawler crane that can prevent the trailer from becoming too large when transporting a car body and its attached upper rotating body on a single trailer, and that can use multiple jack devices to perform incidental work associated with transportation.

The provided crawler crane comprises left and right crawler travelling devices arranged at a distance from each other in the left-right direction and extending forward and backward, a front axle extending in the left-right direction to connect the left and right crawler travelling devices to each other, a rear axle extending in the left-right direction behind the front axle to connect the left and right crawler travelling devices to each other, a car body arranged between the front axle and the rear axle, the car body having a front part to which the front axle is detachably connected and a rear part to which the rear axle is detachably connected, and an upper part rotatably attached to the car body. a rotating body; a left front jack device and a right front jack device arranged at a distance from each other in the left-right direction, 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; and a left rear jack device and a right rear jack device arranged at a distance from each other in the left-right direction behind the left front jack device and the right front jack device, each having a rear beam extending from a base end connected to the car body and a front leg portion supported by the rear beam at a tip end of the rear beam. and a left rear jack device and a right rear jack device each having a rear leg supported by the rear beam and extending up and down, and the front axle is provided with a left front space and a right front space, which are spaces in which the front leg of the left front jack device and the front leg 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 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, respectively, from the car body. The rear axle is shaped to form a left rear space and a right rear space in the area between the front axle and the rear axle, and the rear axle is shaped to form a left rear space and a right rear space in the area between the front axle and the rear axle, in which the rear legs of the left rear jack device and the right rear jack device can be positioned, respectively, when the left rear jack device and the right rear jack device are positioned 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.

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. This makes it possible to perform incidental 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 positioned diagonally forward and two jack devices positioned diagonally rearward, and also makes it possible to reduce the left-right dimensions of the car body, which does not need to be connected to 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.

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. The front axle overhang preferably has a shape with a smaller dimension in the left-right direction 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 dimension in the left-right direction than the front axle body, overhangs rearward from the front axle body toward the car body. Therefore, the front axle body can be positioned forward 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 allows the left front space and the right front space to be formed while keeping the size of the car body compact.

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. The rear axle overhang preferably has a shape with a smaller dimension in the left-right direction 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 dimension in the left-right direction than the rear axle body, overhangs forward from the rear axle body toward the car body. Therefore, 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 allows the left rear space and the right rear space to be formed while keeping the size of the car body compact.

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 the 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, 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 disposed in the diagonal front position. In this configuration, when the left front jack device and the right front jack device are each placed in the front storage position, the front beams are positioned so that they extend from their base ends in a direction away from the rear beam. Therefore, 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.

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 leg of the left rear jack device and the rear leg 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 the left rear jack device and the right rear jack device are each placed in the rear storage position, the rear beams are positioned so that they extend from their base ends in a direction away from the front beam. Therefore, 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.

According to the present disclosure, when a car body and an upper rotating body attached to it are transported on a single trailer, it is possible to prevent the trailer size from becoming large, and a crawler crane is provided that can use four jack devices to perform incidental work associated with transportation.

FIG. 1 is a side view illustrating a crawler crane according to an embodiment of the present disclosure. FIG. 2 is a plan view showing the car body, the front axle, the rear axle, the left and right crawler travelling devices, and the four jack devices of the crawler crane. FIG. 2 is a side view showing the carbody, the front axle, the rear axle, and two jack devices. FIG. 4 is a plan view for explaining the arrangement of the four jack devices relative to the car body. FIG. 4 is a schematic diagram for explaining an example of incidental work accompanying transportation of the crawler crane. FIG. 4 is a schematic diagram for explaining an example of incidental work accompanying transportation of the crawler crane. FIG. 4 is a schematic diagram for explaining an example of incidental work accompanying transportation of the crawler crane. FIG. 4 is a schematic diagram for explaining an example of incidental work accompanying transportation of the crawler crane. FIG. 4 is a schematic diagram for explaining an example of incidental work accompanying transportation of the crawler crane. 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. 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.

The crawler crane according to the embodiment of the present disclosure will be described below with reference to the drawings.

As shown in Figures 1 and 2, the crawler crane 100 includes a lower traveling body 10, an upper rotating body 50, a number of jack devices, a hoisting member 70, and a lifting device 90.

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

The hoisting member 70 includes a boom 71 supported on the rotating body 51 of the upper rotating 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 rotating 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 load-lifting winch device 58 that can wind up or unwind the rope.

The box mast 54 is supported by the rotating body 51 of the upper rotating body 50 so that it can rotate 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 raising and lowering rope 55 is looped multiple times between a sheave block including multiple sheaves arranged on the rotating body 51 of the upper rotating body 50 and a sheave block including multiple sheaves arranged on the tip of the box mast 54.

The hoisting winch device 57 is located 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 located at the tip of the box mast 54 and the sheave block located at the rotating body part 51 of the upper rotating body 50, and the box mast 54 and the boom 71 rotate integrally with respect to the rotating body part 51. The rotation of the box mast 54 is performed, for example, during ancillary work associated with the transportation of the crawler crane 100 described below, and the position of the box mast 54 (the angle of the upper rotating body 50 relative to the rotating body part 51) is almost fixed when the crawler crane 100 is in use (when performing lifting work).

The lower running body 10 is a crawler-type running body that can move on its own on the ground. As shown in Figures 2 and 3, the lower running body 10 includes a car body 20, a front axle 30A, a rear axle 30B, and left and right crawler running 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 running body 10. The direction in which each of the left and right crawler running devices 40L, 40R extends is the front-rear direction, and the horizontal direction perpendicular to this front-rear direction is the left-right direction.

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 hung in a ring shape on these wheels and can move around, and a drive unit (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 unit includes, for example, a motor and a reducer (not shown). The drive unit 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 travel devices 40L, 40R are respectively drawn with dashed lines.

The front axle 30A extends in the left-right direction and connects the crawler frames 41, 41 of the left and right crawler travel 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 fore-aft 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 fore-aft direction.

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 travel 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 that is rear of the center in the fore-and-aft direction, and the right end of the rear axle 30B is connected to a portion of the right crawler frame 41 that is rear of the center in the fore-and-aft direction.

The car body 20 is disposed between the front axle 30A and the rear axle 30B. The car body 20 has a smaller left-right dimension 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 connection parts 23F, 23F disposed in the front part of the car body main body 21, and rear connection parts 23R, 23R disposed in the rear part of the car body main body 21. The front connection parts 23F, 23F are an example of the front part of the car body 20, and are the parts to which the front axle 30A is connected. The rear connection parts 23R, 23R are an example of the rear part of the car body 20, and are the parts to which the rear axle 30B is connected.

The 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 the 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. When the inner circle is rotated relative to the outer circle by the rotating motor, the upper rotating body 50 rotates relative to the lower running body 10 around the central axis A of rotation shown in FIG. 2.

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

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 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, and has a base end 611 connected to the car body main body 21 of the car body 20 and a tip end 612 on the opposite side, and has a shape that extends diagonally forward from the base end 611 to the tip end 612. The leg 62 of each of the left front jack device 60FL and the right front jack device 60FR is an example of a front leg, and is supported by the beam 61 at the tip end 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 can expand and contract vertically, for example, driven by a hydraulic mechanism, and a seat 63 attached to the lower end of the leg body, making it possible to change the length in the vertical direction. The seat 63 has a larger area in a plan view than the leg body.

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 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, and has a base end 611 connected to the car body main body 21 of the car body 20 and a tip end 612 on the opposite side, and has a shape that extends diagonally rearward from the base end 611 to the tip end 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, and is supported by the beam 61 at the tip end 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 can expand and contract vertically, for example, driven by a hydraulic mechanism, and a seat 63 attached to the lower end of the leg body, making it possible to change the length in the vertical direction. The seat 63 has a larger area in a plan view than the leg body.

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.

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 the pins 613 shown in FIG. 3 in these insertion holes, the beam 61 is supported on the car body 20 so that it can rotate around the base end 611. The rotation structures of the other three jack devices 60FL, 60RL, 60RR are the same as that of the right front jack device 60FR.

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 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 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 that is 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.

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 and 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 and 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 and 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 and right from the right end of the car body main body 21.

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 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 diagonal 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 each extend rearward from the car body main body 21. The distance in the left-right direction between the legs 62 of the left rear jack device 60RL and the right rear jack device 60RR arranged in the rear storage position P2 is smaller than when the left rear jack device 60RL and the right rear jack device 60RR are arranged in the diagonally rear position P1.

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 travel 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. In other words, 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 located at positions corresponding to the front connection parts 23F, 23F of the car body 20.

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 running devices 40L, 40R to each other, an axle extension 32 (an example of a rear axle extension) that extends forward 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. In other words, the axle extension 32 of the rear axle 30B is a part that is detachably connected to the rear of the car body 20 via the connection parts 33, 33. The connection parts 33, 33 of the rear axle 30B are located at positions corresponding to the rear connection parts 23R, 23R of the car body 20.

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 the pin 80 is inserted into these through holes with the through holes aligned. This connects the front axle 30A to the car body 20. The pin 80 can be removed from the through hole to remove the front axle 30A 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.

2, the front axle 30A has a shape that forms a left front space S1 and a right front space S2 in the area 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 placed when the left front jack device 60FL and the right front jack device 60FR are placed 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 area 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 placed when the left rear jack device 60RL and the right rear jack device 60RR are placed in the diagonal rear position P1.

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 that extends linearly (rectangular in plan view) 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.

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 travel 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 travel 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 travel 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 travel 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.

In the specific example shown in FIG. 2, the left-right dimension of the axle extensions 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.

The left front space S1 is formed forward of the car body main body 21 and to the left of the turning center axis A. The right front space S2 is formed forward of the car body main body 21 and to the right of the turning center axis A. The left rear space S3 is formed behind the car body main body 21 and to the left of the turning center axis A. The right rear space S4 is formed behind the car body main body 21 and to the right of the turning center axis A.

The left front space S1 may be formed forward of the car body 20 and to the left of the car body 20, the right front space S2 may be formed forward of the car body 20 and to the right of the car body 20, the left rear space S3 may be formed rear of the car body 20 and to the left of the car body 20, and the right rear space S4 may be formed rear of the car body 20 and to the right of the car body 20.

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.

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 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 positioned at the diagonal rear position P1, respectively. This allows the two jack devices 60FL, 60FR located at the diagonal front position P1 and the two jack devices 60RL, 60RR located at the diagonal rear position P1 to stably jack up the car body 20 and the upper rotating body 50 while carrying out incidental 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 the size of the trailer from increasing.

In this embodiment, the front axle 30A has a shape in which the axle extension 32, which has a smaller left-right dimension than the axle body 31, extends rearward from the axle body 31 toward the car body 20. Therefore, even without extending the car body 20 forward, 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. 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.

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. Therefore, even without extending the car body 20 rearward, 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. 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.

In this embodiment, when the left front jack device 60FL and the right front jack device 60FR are each disposed in the front storage position P2, the beams 61 are disposed so as to extend from the base end 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.

In this embodiment, when the left rear jack device 60RL and the right rear jack device 60RR are each disposed in the rear storage position P2, the beams 61 are disposed so as to extend from the base end 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 diagonally 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 coming into contact with the beams 61 of the left front jack device 60FL and the right front jack device 60FR.

By positioning each of the four jack units 60FL, 60FR, 60RL, and 60RR in the storage position P2, the width of the transported object including the car body 20, the upper rotating body 50, and the four jack units 60FL, 60FR, 60RL, and 60RR can be kept within the range of the regulation values for transportation.

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 (forward and backward distance) between the part where the front axle 30A is connected and the part where the rear axle 30B is connected on each of the crawler travelling devices 40L, 40R can be increased. This is advantageous in terms of the strength of the crawler frame 41, and allows the crawler frame 41 to be made lighter. In addition, because the crawler crane 100 has the front axle 30A and the rear axle 30B, it is possible to omit the carbody weight. Furthermore, even if a carbody weight is required, the carbody weight can be made small.

[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.

Figure 5 shows the state in which the object to be transported is loaded onto the trailer 110. The trailer 110 comprises a cabin 111 having a seat for the driver, etc., 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 positioned in the storage position P2.

6 shows the trailer 110 arriving at the destination, such as a work site, and the associated work being 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 rise from the loading platform 112 of the trailer 110. In this state, the trailer 110 moves forward, and the transported object is unloaded from the trailer 110. In the specific example shown in FIGS. 5 and 6, the transported object of the trailer 110 includes the car body 20, the rotating body 51 and 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 transport object. In this case, the transport object may be transported to the destination by the trailer 110 with the box mast 54 detached from the rotating main body 51, and after the transport object is unloaded from the trailer 110 at the destination, the box mast 54 may be attached to the rotating main body 51.

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 using the box mast 54 and the hoisting rope 55 while adjusting the orientation of the upper rotating body 50 relative to the carbody 20, with the carbody 20 and the upper rotating body 50 supported by the four jack devices 60FL, 60FR, 60RL, 60RR. When these works are completed, the legs 62 of the four jack devices 60FL, 60FR, 60RL, 60RR are retracted as shown in FIG. 9, so that the left and right crawler travelling devices 40L, 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, the object is transported to the destination by the trailer 110 with the cabin 52 supported on the rotating body 51 as shown in FIG. 5, and the front axle 30A and the left and right crawler travel devices 40L, 40R are attached to the car body 20 with the cabin 52 supported on the rotating body 51 as shown in FIG. 7 and FIG. 8.

The present disclosure is not limited to the embodiments described above. The present disclosure includes, for example, the following aspects:

(A) Shape of the Front Axle and the Rear Axle 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 a curved portion, for example. The axle overhang 32 may have a trapezoidal shape in plan view, for example, as shown in FIG. 10. The axle overhang 32 may include a plurality of portions that are spaced apart from each other in the left-right direction, for example, as shown in FIG. 11.

(B) Regarding the jack 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 when positioned at the diagonal position P1, 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 related to transportation.

In addition, 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 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 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 unit 60RL and the right rear jack unit 60RR are placed in the storage position P2, the beams 61 are arranged to extend from the base end 611 in a direction away from the beam 61 of the left front jack unit 60FL and the beam 61 of the right front jack unit 60FR, respectively, but they may also be arranged to extend from the base end 611 in a direction toward the beam 61 of the left front jack unit 60FL and the beam 61 of the right front jack unit 60FR.

In the above embodiment, the front storage position P2 of the left front jack apparatus 60FL and the front storage position P2 of the right front jack apparatus 60FR are positions where the beam 61 of the left front jack apparatus 60FL and the beam 61 of the right front jack apparatus 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 apparatus 60FL and the beam 61 of the right front jack apparatus 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 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 each extend rearward from the car body 20, but these rear storage positions P2 may be positions where the beam 61 of the left rear jack device 60RL and the beam 61 of the right rear jack device 60RR each extend obliquely rearward from the car body 20.

20: Car body 21: Car body main body 23F: Front connection part (an example of the front part of the car body)
23R: Rear connection part (an example of the rear part of a car body)
30A: Front axle 30B: Rear axle 31: Axle body 32: Axle overhang 40L: Left crawler travelling device 40R: Right crawler travelling device 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 portion of beam 612: Tip end portion of beam 62: Leg 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 (5)

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. 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. 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. 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. 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.

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