KR102521932B1 - work machine - Google Patents

Abstract

A working machine in which damage to a hydraulic oil piping due to repeated contact with a bulkhead in a frame is prevented without impairing workability of assembly and maintenance. The working machine is discharged from a lower traveling body having a frame, an upper swinging body pivotably supported on the frame, a hydraulic actuator mounted on the frame, and a hydraulic pump disposed in the inner space of the frame and mounted on the upper swinging body. A center joint for supplying hydraulic oil to the hydraulic actuator, and a hydraulic oil pipe connecting the center joint and the hydraulic actuator through an inner space of the frame, the hydraulic oil pipe having a portion passing through an opening provided in a partition wall inside the frame. It is characterized by using a metal pipe and using a part on the hydraulic actuator side from the opening as a flexible pipe having higher flexibility than the metal pipe.

Description

work machine

The present invention relates to a working machine that supplies hydraulic fluid to a hydraulic actuator of an undercarriage through a center joint.

In a general working machine, a hydraulic oil tank or a hydraulic pump is mounted on an upper swing body, and a driving motor for receiving hydraulic oil and driving a crawler belt is provided on a lower traveling body. Therefore, it is necessary to use a center joint in order to transfer hydraulic oil between the lower traveling body and the upper swing body.

Patent Literatures 1 and 2 disclose techniques for preventing a hose connecting the center joint and the travel motor from being damaged by collision with a rock or the like by passing the hose through the inner space of the frame. More specifically, in Patent Literatures 1 and 2, an opening is formed in a partition wall disposed in the internal space of the frame to pass the hose.

Japanese Patent No. 3495163 Japanese Unexamined Patent Publication No. 2002-339402 Japanese Utility Model Publication No. Hei 5-91944

However, in the configurations of Patent Literatures 1 and 2, the hose repeatedly contacts the edge of the opening periphery due to the vibration of the working machine. As a result, there is a problem that the deterioration of the contact portion is accelerated and the life of the hose is shortened.

On the other hand, if a steel pipe is used instead of a hose as in Patent Document 3, deterioration of the contact portion with the edge is reduced. However, laying a low-flexibility steel pipe in the inner space of the frame has a problem of impairing workability of assembly and maintenance.

The present invention has been made in view of the above actual situation, and its object is to provide a working machine that prevents damage to hydraulic oil piping due to repeated contact with bulkheads in a frame, without impairing workability in assembly and maintenance. is to provide

In order to achieve the above object, the present invention provides a lower traveling body having a frame, an upper swinging body pivotally supported on the frame, a hydraulic actuator mounted on the frame, and disposed in the inner space of the frame, A work machine having a center joint for supplying hydraulic oil discharged from a hydraulic pump mounted on the upper swing body to the hydraulic actuator, and a hydraulic oil pipe connecting the center joint and the hydraulic actuator through an inner space of the frame. In the hydraulic oil pipe, a portion passing through an opening provided in a partition wall inside the frame is a metal pipe, and a part on the hydraulic actuator side of the opening is a flexible pipe having higher flexibility than the metal pipe to be characterized

ADVANTAGE OF THE INVENTION According to this invention, the damage of the hydraulic oil piping resulting from repeated contact with the partition wall in a frame can be prevented, without impairing workability of assembly and maintenance. In addition, subjects, configurations, and effects other than the above will be clarified by the description of the following embodiments.

1 is a side view of a hydraulic excavator as a representative example of a working machine according to the present invention.
2 is a schematic diagram of a hydraulic circuit of a hydraulic excavator.
Fig. 3 is a perspective view showing the structure of a frame of an undercarriage.
4 is a plan view of the frame according to the first embodiment.
Fig. 5 is a plan view of the vicinity of the boundary between the head section and the leg section according to the first embodiment.
Fig. 6 is a side view of the vicinity of the boundary between the leg part and the accommodating space according to the first embodiment.
7 is a plan view of a frame according to a second embodiment.
Fig. 8 is a plan view of the vicinity of the boundary between the main body part and the leg part according to the second embodiment.
Fig. 9 is a side view of the vicinity of the boundary between the leg part and the accommodating space according to the second embodiment.
10 is a side cross-sectional view of the plate ASSY.
11 is a front view of the plate ASSY.

EMBODIMENT OF THE INVENTION Embodiment of the working machine which concerns on this invention is described using drawing. 1 is a side view of a hydraulic excavator 1 as a representative example of a working machine according to the present invention. Note that, in this specification, front and rear, left and right, are based on the viewpoint of the operator who rides and operates the hydraulic excavator 1 unless otherwise specified.

[First Embodiment]

A hydraulic excavator (1) includes a lower traveling body (2) and an upper swing body (3) supported by the lower traveling body (2). The undercarriage 2 includes a pair of left and right crawlers 8 and a discharging blade 10. However, the undercarriage 2 may be of a long wheel type instead of the crawler 8.

A pair of left and right caterpillars 8 include a driving wheel 8a disposed at the rear end, a driven wheel 8b disposed at the front end, and a plurality of rollers disposed between the driving wheel 8a and the driven wheel 8b ( 8c) and a crawler belt 8d wound around drive wheels 8a, driven wheels 8b and rollers 8c. Then, the rotation of the driving motor 9 (see Fig. 2) is transmitted and the drive wheel 8a rotates, thereby causing the crawler belt 8d to rotate. As a result, the hydraulic excavator 1 travels.

The discharging blade 10 is supported by the frame 20 (see Fig. 3) at the front end of the undercarriage 2. The discharging blade 10 is a plate-like member extending substantially in the front-back and left-right directions. The discharging blade 10 is configured to be movable in the vertical direction between a grounding position in contact with the ground and a separation position separated from the ground by means of the blade cylinder 11 (see FIG. 2 ). In addition, when the earthing blade 10 is disposed at the ground position and the lower traveling body 2 moves forward, soil on the ground can be moved.

The upper swing body 3 is supported by the lower traveling body 2 in a swingable state by a swing motor (not shown). The upper swing body 3 includes a swing frame 5 serving as a base, a front work machine 4 (work device) installed in the front center of the swing frame 5 so as to be able to rotate in the vertical direction, and the swing frame 5 It mainly includes a cab (driver's seat) 7 disposed on the front left side of and a counterweight 6 disposed on the rear portion of the revolving frame 5.

The front work machine 4 includes a boom 4a supported by the upper swing structure 3 so as to be able to rise, an arm 4b supported so as to be swingable at the tip of the boom 4a, and a tip of the arm 4b. It includes a bucket 4c supported so as to be rockable, and hydraulic cylinders 4d to 4f which drive the boom 4a, the arm 4b, and the bucket 4c. The counterweight 6 is for balancing the weight with the front work machine 4 and is a heavy object in an arc shape.

In the cab 7, an inner space in which an operator operating the hydraulic excavator 1 rides is formed. Further, inside the cab 7, a seat (not shown) on which an operator sits and operating devices (steering, pedals, levers, switches, etc.) operated by the operator seated on the seat are disposed. When an operator riding on the cab 7 operates the operating device, the lower traveling body 2 travels, the upper swinging body 3 turns, and the front work machine 4 operates.

2 is a schematic diagram of a hydraulic circuit of the hydraulic excavator 1 . As shown in FIG. 2 , in the hydraulic excavator 1, the hydraulic oil stored in the hydraulic oil tank 12 is transferred by the hydraulic pump 13 to the hydraulic cylinders 4d to 4f, the traveling motor 9, and the blade cylinder ( 11) and the hydraulic excavator 1 is operated by being pressurized by a swing motor (not shown) or the like.

More specifically, the hydraulic oil tank 12 and the hydraulic pump 13 are mounted on the upper swing structure 3. Then, the hydraulic oil discharged from the hydraulic pump 13 is supplied to the hydraulic cylinders 4d to 4f mounted on the upper swing structure 3 via a hydraulic pipe (not shown). On the other hand, the travel motor 9 and the blade cylinder 11 mounted on the lower travel body 2 (hereinafter, collectively referred to as “hydraulic actuators” in some cases) are supplied from the hydraulic pump 13. The discharged hydraulic oil is supplied via the center joint 14 .

The center joint 14 is mounted on the frame 20 of the undercarriage 2 . The center joint 14 is a so-called "rotary joint" that connects a hydraulic fluid flow path between the lower traveling body 2 and the upper swing body 3. The center joint 14 is provided to prevent a hydraulic oil pipe (not shown) connecting the hydraulic pump 13 and the center joint 14 from being twisted. The center joint 14 is composed of, for example, an external joint and an internal joint capable of relative rotation. Since the configuration of the center joint 14 is already well known, a detailed description thereof will be omitted.

FIG. 3 is a perspective view showing the structure of the frame 20 of the undercarriage 2. As shown in FIG. 4 is a plan view of the frame 20 according to the first embodiment. 3 and 4, the frame 20 of the undercarriage 2 includes a center frame 21 and a pair of side frames 22 and 23 disposed on the left and right sides of the center frame 21. ) is composed of

The center frame 21 is disposed at the center of the lower traveling body 2 and accommodates the center joint 14 while supporting the upper swinging body 3 so as to be able to pivot. The center frame 21 is composed of, for example, a lower round body 24, an upper round body 25, a lower plate 26, an upper plate 27, and a plurality of side plates 28a to 28h. It is a hollow (box shape) frame.

The lower round body portion 24 and the upper round body portion 25 have substantially tubular (cylindrical) outer shapes. And, the lower round body part 24 and the upper round body part 25 are stacked vertically in the center of the center frame 21 . The lower round body part 24 and the upper round body part 25 constitute the main part 30 of the center frame 21 .

The lower plate 26 and the upper plate 27 are plate-shaped members having a substantially X-shaped external shape. The lower plate 26 closes the lower surface of the lower round body part 24 and constitutes the lower wall of the leg parts 31, 32, 33, 34 radially extending from the main body part 30. The upper plate 27 is disposed between the lower round body part 24 and the upper round body part 25, and constitutes the upper walls of the leg parts 31 to 34.

The plurality of side plates 28a to 28h constitute side walls of the leg portions 31 to 34 . More specifically, the side plates 28a and 28b are installed standing apart from each other between the lower plate 26 and the upper plate 27 of the leg portion 31 . The side plates 28c and 28d are installed standing apart from each other between the lower plate 26 and the upper plate 27 of the leg portion 32 . The side plates 28e and 28f are installed standing apart from each other between the lower plate 26 and the upper plate 27 of the leg portion 33 . The side plates 28g and 28h are installed standing apart from each other between the lower plate 26 and the upper plate 27 of the leg portion 34 .

The main body 30 is located at the center of the center frame 21 and accommodates the center joint 14 while supporting the upper swing body 3 so as to be able to pivot. More specifically, the upper swing body 3 is supported so as to be able to swing through a swing bearing (not shown) supported on the upper end of the upper round body portion 25 . In addition, the center joint 14 is installed in the grease bus 25a constituting the upper surface of the upper round body 25 inside the upper round body 25 . Further, an opening 25b for exposing the center joint 14 upward is formed in the grease bus 25a. Although not shown, holes for accessing the center joint 14 are formed in the lower plate 26 and the upper plate 27 .

The leg parts 31-34 connect the main body part 30 and the side frames 22 and 23. More specifically, the leg part 31 extends from the trunk part 30 to the left front, and is connected to the front end side of the side frame 22. The leg part 32 extends from the trunk part 30 to the rear left side and is connected to the rear end side of the side frame 22 . The leg part 33 extends right front from the trunk part 30, and is connected to the front end side of the side frame 23. The leg part 34 extends to the right rear from the trunk part 30, and is connected to the rear end side of the side frame 23.

The trunk portion 30 and the leg portions 31 to 34 are hollow structures each having an inner space. And, the inner space of the main part 30 and the inner space of the leg parts 31 to 34 are separated by the side wall of the main part 30 (that is, the lower round body part 24). In other words, the lower round body portion 24 is a partition that divides the inner space between the trunk portion 30 and the leg portions 31 to 34 .

The side frame 22 extends in the front-back direction in the left direction of the center frame 21 . The side frame 23 extends in the front-back direction on the right side of the center frame 21 . Then, the side frames 22 and 23 support the caterpillar 8 and the traveling motor 9, respectively. In addition, since the structure of the side frames 22 and 23 is common, the side frame 22 is demonstrated in detail below.

The driving wheel 8a is rotatably supported outside the rear end of the side frame 22 . In addition, the travel motor 9 is housed in the accommodating space 22a provided inside the rear end of the side frame 22 . And, the inner space of the leg part 32 and the accommodating space 22a are spaced apart by the bracket (partition wall) 29 provided at the front end of the side frame 22 on the traveling motor 9 side.

As shown in FIG. 4 , the center joint 14 and the traveling motor 9 are connected by a hydraulic oil pipe 40 . The hydraulic oil pipe 40 extends from the center joint 14 through the inner space of the frame 20 to the traveling motor 9 . More specifically, the hydraulic oil piping 40 has one end connected to the center joint 14, the inner space of the main body 30 (lower round body 24), the inner space of the leg 32, and Via the accommodating space 22a, the other end is connected to the traveling motor 9.

Therefore, openings 24a and 29a for passing the hydraulic oil pipe 40 are formed in the lower round body portion 24 and the bracket 29. 5 : is a plan view of boundary vicinity of the trunk part 30 and the leg part 32 concerning 1st Embodiment. 6 is a side view of the vicinity of the boundary between the leg portion 32 and the accommodating space 22a according to the first embodiment.

As shown in FIG. 5 , the opening 24a communicates the inner space of the trunk portion 30 and the inner space of the leg portion 32 . Moreover, as shown in FIG. 6, the opening 29a communicates the internal space of the leg part 32 and the accommodating space 22a. The hydraulic oil piping 40 extends from the center joint 14 to the travel motor 9 through the openings 24a and 29a.

The hydraulic oil pipe 40 is composed of a pair of pipes 40a and 40b that mutually discharge and introduce hydraulic oil from the center joint 14 to the traveling motor 9 . That is, when the travel motor 9 is rotated in the first direction, hydraulic oil is discharged from the center joint 14 to the travel motor 9 through the pipe 40a (supply pipe), and the pipe 40b (return pipe) ), hydraulic oil is introduced from the travel motor 9 to the center joint 14. On the other hand, when the travel motor 9 is rotated in the second direction opposite to the first direction, hydraulic fluid is discharged from the center joint 14 to the travel motor 9 through the pipe 40b (supply pipe), Hydraulic oil flows from the driving motor 9 to the center joint 14 through (40a) (return pipe). In addition, the basic structure of piping 40a, 40b is common. Then, when demonstrating the structure common to piping 40a, 40b, it describes simply as "hydraulic oil piping 40."

As shown in FIG. 4 , the hydraulic oil pipe 40 according to the first embodiment is composed of metal pipes 41 and 42 and a flexible pipe 43 . More specifically, a metal pipe 41 is connected to one end of the flexible pipe 43, and a metal pipe 42 is connected to the other end of the flexible pipe 43, so that one hydraulic oil pipe 40 is configured. . That is, as for the hydraulic oil pipe 40, both ends are comprised by the metal pipes 41 and 42, and the central part is comprised by the flexible pipe 43.

The metal pipes 41 and 42 are pipes made of metal (for example, steel, stainless steel, or a combination thereof). The flexible pipe 43 is a so-called "hose" formed of a highly flexible material (for example, resin, cloth, or a combination thereof). However, the flexible pipe 43 may be reinforced with a metal wire or the like. Compared to the flexible pipe 43, for example, the metal pipes 41 and 42 have high strength, rigidity, impact resistance, etc., but low flexibility.

As shown in FIG. 5 , one end of the metal pipe 41 is connected to the flexible pipe 43 in the inner space of the leg portion 32 . In addition, the other end of the metal pipe 41 is connected to the center joint 14 in the inner space of the main body 30 . That is, the metal pipe 41 extends from the center joint 14 to the inner space of the leg portion 32 through the opening 24a formed in the lower round body portion 24 . Further, the metal pipe 41 passes through the opening 24a at a position away from the edge of the periphery of the opening 24a.

In addition, the metal pipe 41a constituting a part of the pipe 40a and the metal pipe 41b constituting a part of the pipe 40b are formed in the inner space of the main body 30 (that is, the lower round body portion ( It is fixed by the fixing member 44 on the side of the center joint 14 from the side wall of 24). The fixing member 44 according to the present embodiment is fixed to the lower plate 26 in a state in which the metal pipes 41a and 41b are bound. As another example, the fixing member 44 may be fixed to the upper plate 27 or the lower round body 24 .

As shown in FIG. 6 , one end of the metal pipe 42 is connected to the flexible pipe 43 in the inner space of the leg portion 32 . In addition, the other end of the metal pipe 42 is connected to the travel motor 9 in the accommodating space 22a. That is, the metal pipe 42 extends from the travel motor 9 through the opening 29a formed in the bracket 29 to the inner space of the leg portion 32 . Further, the metal pipe 42 passes through the opening 29a at a position away from the edge of the periphery of the opening 29a.

In addition, the metal pipe 42a constituting a part of the pipe 40a and the metal pipe 42b constituting a part of the pipe 40b are provided with a traveling motor ( 9) side), it is fixed by the fixing member 45. The fixing member 45 is fixed to the wall defining the accommodating space 22a in a state where the metal pipes 42a and 42b are bound.

As shown in FIG. 4 , the flexible pipe 43 is disposed in the inner space of the leg portion 32 . More specifically, the flexible pipe 43 is connected to the metal pipes 41 and 42 in the inner space of the leg portion 32 . That is, the flexible pipe 43 is not disposed over the two spaces communicated through the openings 24a and 29a.

According to the first embodiment, the following effects are exhibited, for example.

According to the first embodiment, since the portion passing through the openings 24a and 29a of the hydraulic oil pipe 40 is made of the metal pipes 41 and 42 with low flexibility, the hydraulic excavator 1 is driven. Vibration can prevent the metal pipes 41 and 42 from contacting the edges around the openings 24a and 29a. In addition, since the metal pipes 41 and 42 have high rigidity, they are hard to deteriorate even if they come into contact with the edges around the openings 24a and 29a.

In addition, according to the first embodiment, since the flexible pipe 43 with high flexibility was used between the metal pipes 41 and 42, at the time of passing the leg portion 32 at the time of installation of the hydraulic oil pipe 40 Workability is improved. Further, the flexible pipe 43 comes into contact with the inner wall of the leg portion 32 due to the vibration of the hydraulic excavator 1 . However, since the flexible pipe 43 and the inner wall of the leg portion 32 are in surface contact, the damage to the flexible pipe 43 is small.

Moreover, according to 1st Embodiment, since the fixing member 44 which bound metal pipe 41a, 41b was fixed to the inner wall of the trunk part 30, metal pipe 41a, 41b is around the opening 24a. It is possible to effectively prevent contact with the edge of . In addition, since the fixing member 45 binding the metal pipes 42a and 42b is fixed to the inner wall of the accommodation space 22a, the metal pipes 42a and 42b do not come into contact with the edge around the opening 29a. can be effectively prevented.

In addition, the fixing members 44 and 45 need not be fixed to the inner wall or the like. That is, the fixing members 44 and 45 may function as binding members for binding the pair of metal pipes. This makes it difficult for the vibration of the hydraulic excavator 1 to propagate to the metal pipes 41 and 42 via the inner wall, making it difficult for the metal pipes 41 and 42 to contact the edges around the openings 24a and 29a.

In addition, in the first embodiment, an example in which the metal pipe 41 is directly connected to the center joint 14 and the metal pipe 42 is directly connected to the travel motor 9 has been described. However, the configuration of the hydraulic oil piping 40 is not limited to this. As another example, the metal pipe 41 and the center joint 14 may be connected with a flexible pipe, or the metal pipe 42 and the travel motor 9 may be connected with a flexible pipe. That is, the metal pipe 41, 42 should just be provided at least in the position passing through opening 24a, 29a.

[Second Embodiment]

Next, with reference to FIGS. 7-11, the hydraulic oil piping 50 concerning 2nd Embodiment is demonstrated. 7 is a plan view of the frame 20 according to the second embodiment. 8 : is a plan view of the boundary vicinity of the trunk part 30 and the leg part 32 concerning 2nd Embodiment. Fig. 9 is a side view of the vicinity of the boundary between the leg portion 32 and the accommodating space 22a according to the second embodiment. Fig. 10 is a side sectional view of the plate ASSY 54. Fig. 11 is a front view of the plate ASSY 54.

In addition, the detailed description of the common point with 1st Embodiment is abbreviate|omitted, and it demonstrates mainly a difference point. The basic configuration of the hydraulic excavator 1 according to the second embodiment is the same as that of the first embodiment. On the other hand, 2nd Embodiment differs from 1st Embodiment in the structure of the hydraulic oil piping 50 and the fixing method.

As shown in FIG. 7 , the hydraulic oil pipe 50 according to the second embodiment is composed of flexible pipes 51, 52, and 53 and plate ASSYs 54 and 55. More specifically, the flexible pipe 51 is disposed in the main body portion 30, the flexible pipe 52 is disposed in the leg portion 32, and the flexible pipe 53 is disposed in the accommodating space 22a. And the plate ASSY 54 is connected to the flexible pipes 51 and 52 at the position of the opening 24a. Further, the plate ASSY 55 is connected to the flexible pipes 52 and 53 at the position of the opening 29a.

Moreover, as shown in FIG.8 and FIG.9, the hydraulic oil piping 50 is comprised by a pair of piping 50a, 50b. The role of the pair of pipes 50a and 50b is common to the pair of pipes 40a and 40b. And the hydraulic oil piping 50 contains flexible piping 51a, 52a, 53a for piping 50a, and flexible piping 51b, 52b, 53b for piping 50b. On the other hand, plate ASSYs 54 and 55 are common to piping 50a and 50b.

As shown in Figs. 10 and 11, the plate ASSY 54 is composed of a plate 56, metal pipes 57a and 57b, and nuts 58a and 58b. In addition, since the structure of the plate ASSYs 54 and 55 is common, hereinafter, the plate ASSY 54 will be mainly described.

The plate 56 is a plate-shaped member in which through holes 56a and 56b and bolt holes 56c and 56d are formed. Then, as shown in Fig. 8, the plate 56 of the plate ASSY 54 has bolts 59a and 59b inserted into the bolt holes 56c and 56d so as to block at least a part of the opening 24a. By, it is fixed to the wall surface of the lower round body part 24. Further, as shown in Fig. 9, the plate 56 of the plate ASSY 55 has bolts 59a and 59b inserted into the bolt holes 56c and 56d so as to block at least a part of the opening 29a. By, it is fixed to the bracket 29.

The metal pipe 57a has a first mounting portion 60a provided at one end, a second mounting portion 61a provided at the other end, and a flange portion 62a provided between the first mounting portion 60a and the second mounting portion 61a. consists of The outer dimension of the flange portion 62a is set larger than that of the through hole 56a.

Then, the metal pipe 57a is inserted into the through hole 56a from the second attaching portion 61a side, and the nut 58a is screwed into the second attaching portion 61a side. And the metal pipe 57a is fixed in the state which penetrated the plate 56 by clamping the plate 56 with the flange part 62a and the nut 58a. As a result, as shown in Figs. 8 and 9, the metal pipe 57a passes through the openings 24a and 29a.

The metal pipe 57b has a first mounting portion 60b provided at one end, a second mounting portion 61b provided at the other end, and a flange portion 62b provided between the first mounting portion 60b and the second mounting portion 61b. consists of The outer dimension of the flange portion 62b is set larger than that of the through hole 56b.

And the metal pipe 57b is inserted into the through-hole 56b from the 2nd attachment part 61b side, and the nut 58b is screwed to the 2nd attachment part 61b side. And the metal pipe 57b is fixed in the state which penetrated the plate 56 by clamping the plate 56 with the flange part 62b and the nut 58b. As a result, as shown in Figs. 8 and 9, the metal pipe 57b passes through the openings 24a and 29a.

As shown in FIG. 8 , ends of flexible pipes 51a and 51b are connected to the center joint 14 . In addition, the other ends of flexible pipe 51a, 51b are attached to the 1st attaching part 60a, 60b of the plate ASSY 54 in the main body part 30. Further, the ends of the flexible pipes 52a and 52b are attached to the second attachment portions 61a and 61b of the plate ASSY 54 within the leg portion 32 .

As shown in FIG. 9 , the other ends of the flexible pipes 52a and 52b are attached to the second attachment parts 61a and 61b of the plate ASSY 55 within the leg part 32 . Also, ends of the flexible pipes 53a and 53b are connected to the traveling motor 9 . In addition, the other ends of flexible pipe 53a, 53b are attached to the 1st attaching parts 60a, 60b of the plate ASSY 55 in the accommodating space 22a.

According to the second embodiment, in addition to the effect of the first embodiment, it is possible to stably hold the metal pipes 57a and 57b passing through the openings 24a and 29a.

In addition, in 2nd Embodiment, you may connect the center joint 14 and plate ASSY54 with a metal pipe instead of flexible pipe 51a, 51b. Similarly, the travel motor 9 and the plate ASSY 55 may be connected with a metal pipe instead of the flexible pipes 53a and 53b.

[Other variations]

In the first embodiment and the second embodiment, examples of the metal pipes 41, 42, 57a, and 57b integrally formed of metal have been described, but the specific configuration of the metal pipes 41, 42, 57a, and 57b Not limited to this. As another example, the metal pipe 41, 42, 57a, 57b may be one in which a protector is attached to the outer surface of the flexible pipe. The protector is a cylindrical member formed of metal. That is, the metal pipes 41, 42, 57a, and 57b may have at least a metal outer surface.

In addition, the application location of this invention is not limited to the hydraulic oil piping 40, 50 which connects the center joint 14 and the traveling motor 9. As another example, the present invention may be applied to a hydraulic oil pipe connecting the center joint 14 and the blade cylinder 11, and connecting another hydraulic actuator supported by the center joint 14 and the undercarriage 2 It may be applied to hydraulic oil piping.

In addition, the scope of application of the present invention is not limited to the hydraulic excavator 1, and can be applied to all working machines in which the upper swing body 3 turns with respect to the lower traveling body 2, such as crane trucks and dismantling vehicles. there is.

The embodiments described above are examples for explaining the present invention, and are not intended to limit the scope of the present invention only to those embodiments. Those skilled in the art can implement the present invention in other various aspects without departing from the gist of the present invention.

1: hydraulic shovel
2: lower running body
3: upper orbital body
4: Front work machine (work device)
4a: boom
4b: cancer
4c: bucket
4d to 4f, 12: hydraulic cylinder
5: turning frame
6: Counterweight
7: cap
8: caterpillar
8a: driving wheel
8b: follower wheel
8c roller
8d: crawler belt
9: travel motor
10: clay blade
11: blade cylinder
12: hydraulic oil tank
13: hydraulic pump
14: center joint
20: frame
21: center frame
22, 23: side frame
24: lower round body
24a, 25b, 29a: opening
25: upper round body
25a: Greece Bus
26: lower plate
27: top plate
28a to 28h: side plate
29: bulkhead
30: Main East
31, 32, 33, 34: leg
40, 50: hydraulic oil piping
40a, 40b, 50a, 50b: Piping
41, 42, 57a, 57b: metal pipe
43, 51, 52, 53: flexible piping
44, 45: fixing member
54, 55: plate ASSY
56: plate
56a, 56b: through hole
56c, 56d: bolt holes
58a, 58b: nut
59a, 59b: bolt
60a, 60b: first mounting part
61a, 61b: second mounting part
62a, 62b: flange portion

Claims (9)

A lower traveling body having a frame;
An upper swing body pivotably supported on the frame;
A hydraulic actuator mounted on the frame;
A center joint disposed in the inner space of the frame and supplying hydraulic oil discharged from a hydraulic pump mounted on the upper swing body to the hydraulic actuator;
In the working machine having a hydraulic oil pipe connecting the center joint and the hydraulic actuator through the inner space of the frame,
The hydraulic oil piping,
A portion passing through an opening provided in a partition wall inside the frame is a metal pipe,
A part of the hydraulic actuator side of the opening is made a flexible pipe having higher flexibility than the metal pipe,
In the hydraulic oil piping, a portion connecting the metal piping and the center joint is made the flexible piping. delete The method of claim 1, further comprising a plate attached to the partition wall so as to close the opening and fixing the metal pipe in a state in which it penetrates;
The working machine, characterized in that the metal pipe has a pair of mounting portions protruding from both sides of the plate and to which the flexible pipe is mounted at both ends. delete The method of claim 1, wherein the hydraulic oil pipe,
A supply pipe for supplying hydraulic fluid from the center joint to the hydraulic actuator;
A return pipe for returning hydraulic fluid from the hydraulic actuator to the center joint;
and a binding member for binding the metal pipes of the supply pipe and the return pipe to each other. The working machine according to claim 1, wherein the hydraulic actuator is a traveling motor for driving the lower traveling body. The method of claim 6, wherein the frame,
A center frame for pivotably supporting the upper swing structure;
A pair of side frames disposed on the left and right sides of the center frame, each supporting the driving motor;
The center frame,
A tubular main portion accommodating the center joint therein;
A hollow leg portion connecting the main portion and the side frame,
The partition wall is a side wall of the main body part, and the opening is formed at a position where the inner space of the main body part and the leg part communicate with each other. The method of claim 6, wherein the frame,
A center frame for pivotably supporting the upper swing structure;
A pair of side frames disposed on the left and right sides of the center frame, each supporting the driving motor;
The bulkhead is a bracket provided at a front end of the side frame on the side of the traveling motor. The working machine according to claim 1, wherein the hydraulic actuator is a hydraulic cylinder that raises and lowers a clay discharging blade mounted on the front end of the undercarriage.

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