JP4000975B2 - Self-propelled working machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention belongs to the technical field of self-propelled work machines such as self-propelled cranes.
[0002]
[Prior art]
  As a self-propelled crane that is a self-propelled working machine in which the position of the center of gravity of the vehicle body is lowered, one having the following configuration is known. Hereinafter, the self-propelled crane according to this conventional example is shown in FIG. 8 of the overall view thereof, FIG. 9A of the schematic diagram showing the positional relationship between the frame of the self-propelled crane and the axle, and FIG. Referring to FIG. 9B of the side view of FIG. 9, the self-propelled crane 51 according to this conventional example can lower the center of gravity of the vehicle body, and the vehicle body frame (hereinafter referred to as the lower frame). By increasing the rigidity of the crane, the crane capacity is improved.
[0003]
  More specifically, in the self-propelled crane 51 in which the crane device is mounted on the lower frame 54, the lower frame 54 connects the upper plate 54a, the bottom plate 54b, and the upper plate 54a and the bottom plate 54b to face each other. The two side plates 54c and 54c are formed in a shape in which the cross section is substantially closed. Further, front and rear drive shafts (hereinafter referred to as axles) 60, 60 pass through the lower frame 54 through through holes 79, 79 provided in the side plates 54c, 54c of the lower frame 54. Drive shafts 67 and 67 that transmit power to the differential gear also penetrate the lower frame 54. A swivel base (hereinafter referred to as a swivel base part) 56 is disposed at the center of the lower frame 54 in the vehicle width direction, and a multistage telescopic boom 55 as a work attachment is provided on the swivel base part 56. And a revolving body (hereinafter referred to as an upper revolving body) 58 including a cab 52 is mounted. The engine 75 is mounted on the rear part of the lower frame 54, as can be understood from FIG.
[0004]
  By configuring the lower frame 54 of the self-propelled crane 51 as described above, the following effects can be obtained. First, by passing the axle 60 through the lower frame 54, the position of the lower frame 54 is lowered, and the height to the roof of the cab 52, that is, the vehicle height of the self-propelled crane 51 in the traveling posture is lowered. . Therefore, since the gravity center position of the vehicle body of the self-propelled crane 51 is lowered, the falling angle is increased, and the stability during the crane operation is improved. Moreover, a margin can be made in the height direction by lowering the position of the center of gravity of the vehicle body of the self-propelled crane 51. That is, the height of the lower frame 54 itself can be increased, and the cross-sectional area of the lower frame 54 can be increased, so that the strength is improved (see, for example, Patent Document 1).
[0005]
[Patent Document 1]
          JP-A-9-39645 (page 4-5, FIG. 1-2)
[0006]
[Problems to be solved by the invention]
  According to the self-propelled crane according to the conventional example, as described above, the center of gravity of the vehicle body of the self-propelled crane can be lowered by the configuration in which the axle is passed through the lower frame. It can be considered that the strength of the rubber is improved. However, the swivel pedestal 56 that supports the upper revolving body 58 of the self-propelled crane according to the above-described conventional example is disposed on the upper surface of the lower frame 54, and from the support position of the axles 60, 60 before and after the vehicle. Since it is also an upper position, it is not sufficient in terms of lowering the vehicle height. In particular, as the vehicle width becomes smaller, it becomes difficult to ensure running stability. Further, since the side plate 54c of the lower frame 54 is provided with four through holes through which the axles 60 and 60 pass, there is a limit to improving the strength of the lower frame 54. In addition, since the lower frame 54 has a closed configuration, equipment (hydraulic equipment, electrical equipment) for making various devices differential must be attached to an external position of the lower frame 54, and the entire lower frame 54. It is difficult to reduce the size of the unit.TheIt must be a small cross section and it is difficult to improve the strength).
[0007]
  Accordingly, the object of the present invention is to further reduce the weight of the vehicle body.heartIt is intended to provide a self-propelled working machine that can ensure the running stability by achieving a high level of rigidity and also ensure the sufficient strength and rigidity of the lower frame.
[0008]
[Means for Solving the Problems]
  The present invention has been made in view of the above circumstances. Therefore, in order to solve the above problems, the means employed by the self-propelled work machine according to claim 1 of the present invention is a work attachment that can be raised and lowered. In a self-propelled working machine provided with a lower frame that rotatably supports the provided upper swing body, the lower frame is disposed near a central portion of the lower frame and supports the upper swing body so as to be swingable. The swivel pedestal portion and axle support portions provided on the front and rear sides of the swivel pedestal portion are provided, and the upper surface of the swivel pedestal portion is configured to be positioned below the upper surface of the axle support portion.The axle support portion includes an upper frame member and a lower frame member that sandwich the axle from above and below, and each of the upper and lower frame members has a cross-sectional structure that is a closed cross-sectional structure.It is characterized by. According to the first aspect of the present invention, the upper surface of the swivel base that supports the upper revolving body can be made lower than that of the conventional example, and the center of gravity of the vehicle body can be lowered, so that traveling stability is improved. .Further, the rigidity of the axle support portion can be increased.
[0009]
  The means employed by the self-propelled work machine according to claim 2 of the present invention is the self-propelled work machine according to claim 1, wherein the means is above the swivel pedestal portion, and the upper surface of the swivel pedestal portion and the A swivel bearing is disposed between the upper surface of the axle support portion. According to the second aspect of the present invention, the swing bearing protruding downward from the upper swing body can be stored below the lower frame height, and the lower surface of the upper swing body to which the swing bearing is attached can be brought closer to the lower frame side. As a result, the center of gravity can be further lowered and the running stability can be further improved.
[0010]
  The means employed by the self-propelled working machine according to claim 3 of the present invention is as defined in claim 1 or2In the described self-propelled working machine, the lower surface of the swivel pedestal portion is configured to be at a level higher than the lower surface of each axle support portion. According to the third aspect of the present invention, there is no fear that the lower surface of the swivel pedestal portion of the lower frame, which has a low center of gravity when the self-propelled working machine is traveling, will come into contact with the ground, and there will be no trouble in traveling.
[0011]
  The means employed by the self-propelled working machine according to the fourth aspect of the present invention is the first aspect.~3ofAnywayCrabThe self-propelled working machine described above is characterized in that an inclined surface inclined obliquely upward toward the outer side in the front-rear direction of the lower frame is formed on the lower surface of each axle support portion. According to the fourth aspect of the present invention, it is possible to reduce the possibility that the lower surface of the lower frame comes into contact with the ground when entering a hill or when leaving the hill.
[0012]
  Claims of the invention5The means employed by the self-propelled working machine according to claim 1 is as follows.Any of ~ 4In the self-propelled working machine described in the above, the upper frame member and the lower frame member are configured such that the section modulus at each part in the front-rear direction is a value corresponding to the stress acting on each part. It is characterized by. This claim5According to the invention according to the above, there is no possibility of excess or deficiency in the rigidity of each part in the front-rear direction of the upper frame member and the lower frame member.
[0013]
  Claims of the invention6The means employed by the self-propelled working machine according to claimTo 5In the self-propelled working machine described above, an outrigger and a rigger support portion are provided at the front end portion and the rear end portion of the lower frame to support an outrigger in a direction perpendicular to the front-rear direction of the lower frame, and the outrigger The support portion is sandwiched and supported by the upper frame member and the lower frame member. This claim6According to the invention according to, the outrigger can be supported with high strength. On the other hand, since the rigidity of the upper frame member and the lower frame member is also improved, it is possible to contribute to the reduction of vibration during traveling of the self-propelled work vehicle and the improvement of safety during crane work.
[0014]
  Claims of the invention7The means adopted by the self-propelled working machine according to claim 5 is as follows.Or 6In the self-propelled working machine described above, the upper frame member and the lower frame member are divided into two on the left and right sides of the lower frame. This claim7According to the invention, it is possible to dispose devices such as valves, conduits, electric wires, etc. between the frame members, contributing to an improvement in the arrangement space for these devices, conduits, electric wires, etc. can do. Further, since the frame member divided into two on the left and right sides is structured to connect the left and right of the outrigger support portion, it is advantageous for strength and torsion.
[0015]
  Claims of the invention8The means employed by the self-propelled working machine according to claim 1 is as follows.To ~ 7The self-propelled working machine described above is characterized in that an engine is mounted on the upper swing body. This claim8According to the invention, the lower frame is more compact than the conventional example, and the position of the upper swing body is also lowered, so that the center of gravity of the vehicle body of the self-propelled work machine can be lowered.
[0016]
  Claims of the invention9The means employed by the self-propelled working machine according to claim8In the self-propelled working machine according to claim 2, the heavy object such as the engine or hydraulic oil, a fuel tank, etc. is on the opposite side of the cab of the upper revolving structure and is positioned lower than the upper end of the wheel of the lower traveling structure. A heavy-weight load such as an engine or hydraulic oil or a fuel tank is mounted on a heavy load mounting portion having a mounting surface. This claim9According to the invention according to the present invention, it is possible to mount a heavy object such as an engine or hydraulic oil, a fuel tank or the like at a lower position than the upper end of the wheel of the lower traveling body. be able to.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
  Hereinafter, the case where the self-propelled work machine is a self-propelled crane will be described as an example of the self-propelled work machine according to Embodiment 1 of the present invention. 1 is an overall side view of the self-propelled crane, FIG. 2 is an overall plan view of the self-propelled crane, FIG. 3A is a plan view of a lower frame constituting the lower traveling body of the self-propelled crane, and FIG. b) is a side view of the lower frame constituting the lower traveling body of the self-propelled crane.
[0018]
  Reference numeral 1 shown in FIGS. 1 and 2 is a self-propelled crane according to Embodiment 1 of the present invention.
  The self-propelled crane 1 includes an upper swinging body 2 that can pivot freely. The upper swing body 2 is supported in a forwardly tilted state with the upper frame 2a being rotatable and the front frame being lower than the rear edge by the upper frame 2a, and is moved in the front-rear direction by the frame moving cylinder 2d. A movable frame 2c, a telescopic multi-stage telescopic boom 2e that is supported by a boom foot pin 2g at the rear end of the movable frame 2c and is raised and lowered by a boom hoisting cylinder 2f, and the upper frame 2a, and a cab 2h that serves both as a crane cockpit and a driving cab. Further, the upper frame 2a is provided with hydraulic equipment, an engine 2i that drives a hydraulic pump that supplies pressure oil to the hydraulic equipment, and a hydraulic oil tank 2j.
[0019]
  The upper frame 2a is mounted via a swivel bearing 2b at a substantially central portion in the longitudinal direction and the width direction of the lower traveling body 4 to be described later. Before and after the lower traveling body 4, an axle 6 having a tire 6 a attached to the tip is provided. Further, the outrigger beam 7a is projected outwardly in the vehicle width direction at the time of crane work at two locations, the front side and the rear side of the mounting position of the axle 6 of the lower traveling body 4, and the outrigger cylinder 7b is extended. Thus, an outrigger device 7 is provided that supports the self-propelled crane 1 by levitating it horizontally. When the self-propelled crane 1 travels, the outrigger cylinder 7b is reduced and the outrigger beam 7a is reduced and stored.
[0020]
  The hydraulic oil discharged from the hydraulic pump driven by the engine 2i is outriggered via each operation hydraulic device provided in the cab 2h and a swivel joint 3 provided in the center of the swing bearing 2b. A beam operating cylinder that projects and retracts the beam 7a, an outrigger cylinder 7b that is vertically attached to the tip of the outrigger beam 7a, and a lower frame 5 of the lower traveling body 4 that drives the differential gear of the axle 6 It is configured to be supplied to a traveling hydraulic motor (not shown) and an operating device. Of course, the brake oil is also supplied to the brake caliper via the swivel joint 3.
[0021]
  Further, the pressure oil discharged from the hydraulic pump does not go through the swivel joint 3, but moves the frame moving cylinder 2d for moving the moving frame 2c, the boom hoisting cylinder 2f for hoisting the multistage telescopic boom 2e, and the multistage telescopic boom 2e. A boom telescopic cylinder (not shown) to be expanded and contracted, and a winch (not shown) that winds and lowers the wire rope are supplied.
[0022]
  The lower frame 5 of the lower traveling body 4 is configured as shown in FIGS. 3 (a) and 3 (b). That is, a swivel base portion 5a formed in a substantially box shape to which the upper swivel body 2 is attached via a swivel bearing 2b is provided at substantially the center in the longitudinal direction and the width direction of the lower frame 5. . Further, an axle support portion 5b for supporting the axle 6 is provided before and after the turning pedestal portion 5a, and the front side of the front axle support portion 5b and the rear side of the rear axle support portion 5b. Each is provided with an outrigger support 5f.
[0023]
  3B, the upper surface 5au of the swivel base 5a is positioned at a lower level than the upper surface 5bu of the axle support 5b (specifically, the upper surface of the upper frame member 5c). Is configured to do. As is well understood from FIG. 1, the slewing bearing 2b is positioned between the upper surface 5au of the swivel base 5a and the upper surface 5bu of the axle support 5b. Therefore, according to the self-propelled crane 1 according to the first embodiment, the upper surface 5au of the swivel pedestal portion 5a that supports the upper-part turning body 2 is lower than the conventional example, and the gravity center position of the self-propelled crane 1 is lowered. Therefore, it is possible to exhibit an excellent effect that the running stability is improved.
[0024]
  The lower surface 5al of the turning pedestal 5a is configured to be at a higher level than the lower surface 5bl (specifically, the lower surface of the lower frame member 5d) of each of the axle support portions 5b, and these axle support portions 5b. An inclined surface 5e is formed on each lower surface 5bl. The inclined surface 5e is inclined obliquely upward toward the outer side in the front-rear direction of the lower frame 5. Accordingly, there is no fear that the lower surface 5bl of the swivel base portion 5a of the lower frame 5 whose center of gravity is lowered when the self-propelled crane 1 travels will come into contact with the ground, so that the self-propelled crane 1 may interfere with travel. In addition, the risk of the lower surface of the axle support portion 5b coming into contact with the ground when entering a hill or when leaving the hill is reduced. By the way, the lower surface 5al of the turning pedestal portion 5a only needs to be configured to be at a higher level than the lower surface of the axle support portion 5b. The level difference between the upper surface 5au of the turning pedestal portion 5a and the upper surface 5bu of the axle support portion 5b is preferably as large as possible within a range in which the strength of the turning pedestal portion 5a can be secured.
[0025]
  The axle support 5b is composed of an upper frame member 5c and a lower frame member 5d that sandwich the axle 6 from above and below, and each of these upper and lower frame members 5c and 5d has a closed cross section with a rectangular cross section. The upper and lower frame members 5c and 5d are configured so that the section modulus at each part in the front-rear direction becomes a value corresponding to the stress acting on each part. Accordingly, the rigidity of the axle support portion 5b can be increased, and there is no possibility that excess or deficiency occurs in the rigidity of each part in the front-rear direction of the upper frame member 5c and the lower frame member 5d, and there is no excess quality part. Therefore, the weight of the lower frame 5 can be greatly reduced.
[0026]
  As described above, the outrigger support portions 5f are formed on the front side of the front axle support portion 5b of the lower frame 5 and on the rear side of the rear axle support portion 5b. More specifically, these outrigger support portions 5f are sandwiched and supported by the upper frame member 5c and the lower frame member 5d in a direction perpendicular to the front-rear direction of the lower frame 5. Accordingly, the outrigger device 7 can be supported with high strength, and the rigidity of the upper frame member 5c and the lower frame member 5d is also improved, so that vibration during the traveling of the self-propelled crane 1 can be reduced and crane operation can be performed. The effect that it can contribute to the improvement of safety arises.
[0027]
  Further, as described above, since the engine 2i is mounted on the upper frame 2a, and it is not necessary to provide the mounting position of the engine 2i on the lower frame 5, the lower frame 5 can have a compact configuration, and the upper frame Since the position of the revolving structure 2 is also lowered, an excellent effect that the center of gravity of the entire self-propelled crane 1 can be lowered is obtained.
[0028]
  The self-propelled crane according to the second embodiment of the present invention is configured as shown in FIG. 4 (a) of the plan view of the lower frame constituting the lower traveling body of the self-propelled crane and the lower traveling body of the self-propelled crane. A description will be given with reference to FIG. 4B of the side view of the lower frame. However, the self-propelled crane according to the second embodiment is different from the self-propelled crane according to the first embodiment in the configuration of the axle support portion of the lower frame, and the other configuration is exactly the same. Therefore, the same components as those in the first embodiment and those having the same functions are denoted by the same reference numerals, and different points will be described.
[0029]
  As shown in FIG. 4A, the upper frame member 5c and the lower frame member 5d of the axle support portion 5b are divided into two parts on the left and right sides of the lower frame 5. Therefore, according to the self-propelled crane which concerns on this Embodiment 2, in addition to having an effect equivalent to the self-propelled crane which concerns on the said Embodiment 2, between upper frame members or between lower frame members Since devices such as valves, pipes, electric wires, and the like can be arranged between them, it is possible to contribute to an improvement in the arrangement space for these devices, pipes, electric wires, and the like. In addition, since the frame member divided into the left and right is connected to the left and right of the outrigger support portion 5f, there is an effect that it is advantageous for strength and torsion.
[0030]
  The self-propelled crane according to the third embodiment of the present invention is configured as shown in FIG. 5 (a) of the plan view of the lower frame constituting the lower traveling body of the self-propelled crane and the lower traveling body of the self-propelled crane. A description will be given with reference to FIG. 5B of the side view of the lower frame. However, the self-propelled crane according to the third embodiment is different from the self-propelled crane according to the first embodiment in the configuration of the axle support portion of the lower frame, and the other configuration is exactly the same. Therefore, the same components as those in the first embodiment and those having the same functions are denoted by the same reference numerals, and different points will be described.
[0031]
  The axle support portion 5b of the lower frame 5 according to the third embodiment has a lattice structure made of a steel pipe. Thus, even if the axle support portion 5b is changed from a box structure to a lattice structure, the self-propelled crane according to the third embodiment can obtain the same effect as the self-propelled crane according to the first embodiment. Can do.
[0032]
  A self-propelled crane according to a fourth embodiment of the present invention will be described with reference to FIG. 6 of an overall side view of the self-propelled crane. However, the self-propelled crane according to the fourth embodiment is different from the self-propelled crane according to the first embodiment in the support structure of the multistage telescopic boom of the upper frame. Since the configuration is the same as that of the first embodiment, the same components as those of the first embodiment and the components having the same functions are denoted by the same reference numerals, and different points will be described.
[0033]
  As is well understood in the comparison between FIG. 6 and FIG. 1, in the self-propelled crane 1 according to the first embodiment, the moving frame 2c is supported by the upper frame 2a so as to be movable in the front-rear direction. In contrast, the self-propelled crane 1 according to the fourth embodiment of the present invention has a conventional structure in which a multistage telescopic boom 2e is supported at the end of the boom via a boom foot pin 2g. Similarly to the example, a multi-stage telescopic boom 2e is supported by a bracket portion formed at the rear and upper part of the upper frame 2a via a boom foot pin 2g so as to be raised and lowered.
[0034]
  Therefore, according to the self-propelled crane 1 according to the fourth embodiment, in addition to having the same effect as the self-propelled crane according to the first embodiment, it is not necessary to provide a moving frame. The structure of the swivel body 2 is simplified, which is more advantageous than the first embodiment in terms of the cost of the mobile crane 1 itself. By the way, in the self-propelled crane according to the fourth embodiment, a lower frame having the configuration shown in FIGS. 3A and 3B is adopted as the lower frame 5 of the lower traveling body 4. However, a lower frame having the configuration shown in FIGS. 4A and 4B and a lower frame having the configuration shown in FIGS. 5A and 5B can be employed.
[0035]
  A self-propelled crane according to a fifth embodiment of the present invention will be described with reference to FIG. 7 of a schematic overall side view of the self-propelled crane. However, since the self-propelled crane according to the fifth embodiment has almost the same configuration as the self-propelled crane according to the first embodiment, it is the same as that of the first embodiment and the same function as the first embodiment. Differences will be described with reference numerals.
[0036]
  That is, the engine 2i or a hydraulic oil tank (not shown) is located on the opposite side of the cab 2h of the upper swing body 2 of the self-propelled crane 1 and at a lower position than the upper end of the tire 6a that is the wheel of the lower travel body 4. A heavy load mounting portion 4a having a mounting surface for mounting a heavy load such as a fuel tank is provided. And the engine 2i is mounted in this heavy load mounting part 4a. Of course, the fender on the upper surface side of the lower traveling body is considered not to interfere with the upper revolving body 2, and the tire house on the inner surface thereof does not interfere with the vehicle body frame even when the tire 6a is fully steered. Furthermore, it is comprised by the inclined surface or curved surface along the tire steering locus surface. With such a configuration, a sufficient space can be secured.
[0037]
  According to the self-propelled crane 1 according to the fifth embodiment, the heavy load mounting portion 4a provided at a position lower than the upper end of the wheel 6a of the lower traveling body 4 is provided with the engine 2i, or hydraulic oil or fuel tank (not shown). Since such heavy-weight items are mounted, an excellent effect that the center of gravity of the vehicle body of the self-propelled crane 1 can be further lowered can be obtained.
[0038]
【The invention's effect】
  As described above, according to the self-propelled work machine according to claim 1 of the present invention, the lower frame of the self-propelled work machine is disposed near the center of the lower frame.,UpA swivel pedestal for pivotally supporting the swivel part and an axle support provided on each of the front and rear sides of the swivel pedestal, wherein the upper surface of the swivel pedestal is below the upper surface of the axle support. Configured to be locatedThe axle support portion includes an upper frame member and a lower frame member that sandwich the axle from above and below, and each of the upper and lower frame members has a cross-sectional structure that is a closed cross-sectional structure.In addition, the upper surface of the swivel base that supports the upper revolving structure can be made lower than that of the conventional example, and the center of gravity of the vehicle body can be lowered, so that the running stability is improved.Further, the rigidity of the axle support portion can be increased.
[0039]
  According to the self-propelled working machine according to claim 2 of the present invention, the swivel bearing is disposed above the swivel base and between the upper surface of the swivel base and the upper surface of the axle support. Therefore, the slewing bearing protruding downward from the upper swing body can be kept below the lower frame height, and the lower surface of the upper swing body to which the slewing bearing is attached can be brought closer to the lower frame side, further reducing the center of gravity. As a result, the running stability is further improved.
[0040]
  According to the self-propelled working machine according to claim 3 of the present invention, the lower surface of the swivel base is configured to be at a level higher than the lower surface of each of the axle support portions. During traveling, there is no fear that the lower surface of the swivel base portion of the lower frame having a low center of gravity will come into contact with the ground, and there will be no trouble in traveling.
[0041]
  According to the self-propelled working machine according to claim 4 of the present invention, since the inclined surface inclined obliquely upward toward the outside of the lower frame is formed on the lower surface of each axle support portion, The risk of the lower surface of the lower frame coming into contact with the ground when entering or leaving the slope is reduced.
[0042]
  Claims of the invention5According to the self-propelled working machine according to the present invention, the upper frame member and the lower frame member of the axle support portion are configured such that the section modulus at each part in the front-rear direction becomes a value corresponding to the stress acting on each part. Therefore, in addition to eliminating the possibility of excess and deficiency in the rigidity of each part in the front-rear direction of the upper frame member and the lower frame member, it contributes to weight reduction of the lower frame because there is no excess quality part. Can do.
[0043]
  Claims of the invention6InTo the self-propelled working machineAccording to the present invention, an outrigger support portion for supporting an outrigger is provided at a front end portion and a rear end portion of the lower frame in a direction perpendicular to the front-rear direction of the lower frame, and the outrigger support portion is formed of the upper frame member and the lower frame member. Since the outrigger can be supported with high strength while the rigidity between the upper frame member and the lower frame member is improved, vibration reduction during traveling of the self-propelled work machine, And it can contribute to the improvement of safety during crane operation.
[0044]
  Claims of the invention7According to the self-propelled working machine according to the present invention, the upper frame member and the lower frame member are divided into two parts on the left and right sides of the lower frame, and devices such as valves, pipes, electric wires, etc. are provided between the frame members. Since it can be arranged, it can contribute to the improvement of the arrangement space for these devices, pipes, electric wires and the like. Further, since the frame member divided into two on the left and right sides is structured to connect the left and right of the outrigger support portion, it is advantageous for strength and torsion.
[0045]
  Claims of the invention8According to the self-propelled working machine according to the present invention, since the engine is mounted on the upper swing body, the lower frame is more compact than the conventional example, and the position of the upper swing body is also
[0046]
  Claims of the invention9According to the self-propelled working machine according to the present invention, it is possible to mount a heavy object such as an engine or hydraulic oil, a fuel tank, etc. below the upper end of the wheel of the lower traveling body. The position can be lowered.
[Brief description of the drawings]
FIG. 1 is an overall side view of a self-propelled crane according to a first embodiment of the present invention.
FIG. 2 is an overall plan view of the self-propelled crane according to the first embodiment of the present invention.
FIG. 3 relates to the first embodiment of the present invention, FIG. 3 (a) is a plan view of a lower frame constituting a lower traveling body of a self-propelled crane, and FIG. 3 (b) is a lower traveling of the self-propelled crane. It is a side view of the lower frame which comprises a body.
FIG. 4 relates to the second embodiment of the present invention, FIG. 4 (a) is a plan view of a lower frame constituting the lower traveling body of the self-propelled crane, and FIG. 4 (b) is a lower traveling of the self-propelled crane. It is a side view of the lower frame which comprises a body.
5A is a plan view of a lower frame constituting a lower traveling body of a self-propelled crane, and FIG. 5B is a lower traveling of the self-propelled crane according to a second embodiment of the present invention. It is a side view of the lower frame which comprises a body.
FIG. 6 is an overall side view of a self-propelled crane according to a fourth embodiment of the present invention.
FIG. 7 is a schematic overall side view of a self-propelled crane according to a fifth embodiment of the present invention.
FIG. 8 is an overall view of a self-propelled crane according to a conventional example.
FIG. 8A is a schematic diagram showing a positional relationship between a frame and an axle of a self-propelled crane according to a conventional example, and FIG. 8B is a side view of FIG. 8A.
[Explanation of symbols]
1 ... Self-propelled crane
2 ... upper revolving body, 2a ... upper frame, 2b ... slewing bearing, 2c ... moving frame, 2d ... frame moving cylinder, 2e ... multistage telescopic boom, 2f ... boom hoisting cylinder, 2g ... boom foot pin, 2h ... cab, 2i ... Engine, 2j ... Hydraulic oil tank
3 ... Swivel joint
4 ... Lower traveling body, 4a ... Heavy load mounting part
5 ... Lower frame, 5a ... Turning base, 5au ... Upper surface of the turning base, 5al ... Lower surface of the turning seat, 5b ... Axle support, 5bu ... Upper surface of the axle support, 5bl ... Lower surface of the axle support, 5c ... Upper frame member, 5d ... Lower frame member, 5e ... Inclined surface, 5f ... Outrigger support
6 ... Axle, 6a ... Tire
7 ... Outrigger device, 7a ... Outrigger beam, 7b ... Outrigger cylinder

Claims (9)

In a self-propelled working machine having a lower frame that pivotably supports an upper swing body having a undulating work attachment, the lower frame is disposed near the center of the lower frame, and the upper swing body And a pivot support provided on each of the front and rear sides of the swivel pedestal, and the upper surface of the swivel pedestal is positioned below the upper surface of the axle support. The axle support portion is composed of an upper frame member and a lower frame member that sandwich the axle from above and below, and each of the upper and lower frame members has a cross-sectional structure in a closed cross-section structure. A self-propelled working machine.   2. The self-propelled type according to claim 1, wherein a swivel bearing is disposed above the swivel base part and between the upper surface of the swivel base part and the upper surface of the axle support part. Work machine. 3. The self-propelled working machine according to claim 1, wherein a lower surface of the swivel base portion is configured to be at a level higher than a lower surface of each of the axle support portions. The lower surface of each of the axle support portion, a self-propelled one crab according to claims 1 to 3, characterized in that the inclined surface is formed to be inclined obliquely upward toward the front-rear direction outside of the lower frame Work machine. The upper frame member and the lower frame member are configured such that a section modulus at each part in the front-rear direction is a value corresponding to a stress acting on each part . A self-propelled working machine according to any one of the above. Outer and rigger support portions are provided at the front end portion and the rear end portion of the lower frame to support the outrigger in a direction orthogonal to the front-rear direction of the lower frame, and the outrigger support portion includes the upper frame member and a lower portion. The self-propelled working machine according to claim 5, wherein the self-propelled working machine is sandwiched and supported by a frame member. The self-propelled work machine according to claim 5 or 6, wherein the upper frame member and the lower frame member are divided into two on the left and right sides of the lower frame. Self-propelled working machine according to claim 1-7, characterized in that the engine to the upper swing structure is mounted. The heavy load such as the engine or hydraulic oil, fuel tank, etc. has a mounting surface provided on the opposite side of the cab of the upper swing body and below the upper end of the wheel of the lower travel body. The self-propelled working machine according to claim 8 , wherein a heavy object such as an engine or hydraulic oil or a fuel tank is mounted on the part.

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