JP6769920B2 - Open leg type hydraulic excavator - Google Patents

Description

According to the present invention, the left and right traveling devices can be opened in a V-shape by widening the distance between the front portions of the track-type left and right traveling devices, and the area between the front portions of the left and right traveling devices can be excavated. Regarding leg type hydraulic excavators. For example, the present invention relates to an electrically driven open-legged hydraulic excavator that excavates while changing the position in small steps depending on a traveling body at the bottom of a vertical hole (deep foundation pile hole) into which a deep foundation pile is inserted by the deep foundation method.

For example, in the deep foundation construction method in which a deep foundation pile (foundation) of a new steel tower is constructed deep underground when rebuilding a steel tower such as a power transmission line in a mountainous area, a small-diameter vertical hole for inserting the deep foundation pile is excavated. To do. However, in the excavation work of vertical holes in mountainous areas, it is often impossible to secure a carry-in route and a wide scaffolding, and large-scale machinery and equipment cannot be used. In such a case, for example, a disassembled excavator that can be transported by helicopter, an ultra-small hydraulic excavator, or the like may be used. This is a construction method in which a disassembled excavator is assembled on-site, a vertical hole is excavated from the ground surface to a certain depth, and an ultra-small hydraulic excavator is thrown into the vertical hole with a crane or the like to dig the vertical hole.

However, inside a vertical hole with a small diameter (for example, about 2.5 m in diameter), the area that can actually be excavated is narrow because the traveling body that touches the bottom of the vertical hole is in the way, no matter how small the hydraulic excavator is. The position and orientation of the traveling body must be changed, and the work cannot proceed efficiently. Therefore, as described in Patent Document 1, a hydraulic pressure capable of excavating a region between the left and right track-type traveling devices by opening the legs in a V shape with a gap on the front side of the track-type left and right traveling devices. There is an excavator. Hereinafter, this type of hydraulic excavator will be referred to as an "open leg type hydraulic excavator".

Jikkai Sho 59-102654

However, when the traveling device is opened, the fall fulcrum (in this case, the front end of the ground contact portion of the track) retracts and approaches the center of gravity of the aircraft, which reduces the stability of the aircraft. For example, if the rock breaks when the legs are opened and the rock in the area between the left and right traveling devices is crushed, the crushing reaction force generated in the breaker suddenly disappears, and at that time, the aircraft leans forward depending on the inclination of the ground. there is a possibility.

An object of the present invention is that the bottom of a small-diameter vertical hole can be efficiently excavated by widening the distance between the front parts of the track-type left and right traveling devices and opening the legs in a V shape, and the legs fall when the legs are opened. An object of the present invention is to provide an open-legged hydraulic excavator capable of suppressing the retreat of a fulcrum and suppressing a decrease in the stability of the airframe.

In order to achieve the above object, the present invention presents a traveling body, a swivel body rotatably provided on the upper part of the traveling body, a working machine attached to the swivel body, a hydraulic actuator for driving the working machine, and the hydraulic actuator. A hydraulic pump for discharging pressure oil for driving the hydraulic pump and a prime mover for driving the hydraulic pump are provided, and the traveling body is rotatably connected to a center frame supporting the swinging body and the center frame to each other. In an open-leg hydraulic excavator equipped with a left and right traveling device capable of opening the legs in a V shape by expanding the distance between the front parts of the shaft, and a cylinder for opening and closing the left and right traveling devices, the left and right traveling devices. Is configured to open the legs up to 90 degrees, and the vehicle of the traveling body when the dimension of the traveling device in the front-rear direction is equal to or less than the length of the turning body in the front-rear direction and the left and right traveling devices are parallel to each other. An outrigger that is set to have a length in the width direction, is provided only at the rear part of the center frame, and has a ground contact portion formed in a right-angled triangular shape along the rear edges of the left and right traveling devices at the time of maximum leg opening. When, and a restraining mechanism for restraining the rotation relative to at least one of the center frame of the left and right traveling devices.

According to the present invention, the bottom of a small-diameter vertical hole can be efficiently excavated by expanding the distance between the front parts of the track-type left and right traveling devices and opening the legs in a V shape, and the legs fall when the legs are opened. It is possible to suppress the retreat of the fulcrum and suppress the decrease in the stability of the aircraft.

It is a side view which shows the whole structure of the open leg type hydraulic excavator which concerns on one Embodiment of this invention, and shows the open leg type hydraulic excavator which attached the bucket as an attachment. It is a side view which shows the whole structure of the open leg type hydraulic excavator which concerns on one Embodiment of this invention, and shows the open leg type hydraulic excavator which attached the breaker as an attachment. It is a top view of the traveling body of the open leg type hydraulic excavator shown in FIG. It is a figure which saw from the front of the restraint mechanism on the left side of the open leg type hydraulic excavator shown in FIG. It is a top view which shows the state of the open leg type hydraulic excavator shown in FIG. 1 which works by closing a leg at the bottom of a vertical hole. It is a top view which shows the state of the open leg type hydraulic excavator shown in FIG. 1 which works by opening a leg at the bottom of a vertical hole. It is a top view of the traveling body shown in FIG. 3 in a state where only the traveling device on the left side is restrained by a stopper pin and the legs are opened. It is a top view of the open leg type hydraulic excavator shown in FIG. 1 in the state where only the traveling device on the left side is restrained by the stopper pin and the legs are opened.

Embodiments of the present invention will be described below with reference to the drawings.

1. 1. Open-legged hydraulic excavator FIGS. 1 and 2 are side views showing the overall configuration of the open-legged hydraulic excavator according to the embodiment of the present invention. Note that FIG. 1 shows an open-legged hydraulic excavator equipped with a bucket as an attachment, and FIG. 2 shows an open-legged hydraulic excavator equipped with a breaker as an attachment. When the term "hydraulic excavator" is used in the following description without particular notice, it refers to an open-legged hydraulic excavator. Further, the front of the driver's seat of the hydraulic excavator 100 in FIG. 1 (left in the figure) is the front.

The hydraulic excavator 100 is inserted into a vertical hole (deep foundation pile hole) H into which a deep foundation pile (not shown) is inserted by, for example, a deep foundation method, and excavation work is performed at the bottom of the vertical hole while changing the position in small steps depending on the traveling body. , A work machine that digs vertical holes. The hydraulic excavator 100 includes a traveling body 10, a swivel body 30, and a working machine (front working machine) 40.

2. Traveling body The traveling body 10 is a track-type (crawler type) traveling body for the hydraulic excavator 100 to travel by itself, and includes a track frame 11, left and right traveling devices 12, and outriggers 13. The track frame 11 forms a frame of the traveling body 10, and is composed of a center frame 14 (FIG. 3), left and right links 15 (FIG. 3), and left and right side frames 16 so as to be H-shaped in a plan view when the legs are closed. It is formed. The outrigger 13 is provided at the rear portion (the right portion in FIG. 1) of the center frame 14. The outriggers are not provided on the front part of the center frame 14 because they may interfere with the excavation work, and the outriggers 13 are provided only on the rear part. The outrigger 13 swings up and down by a cylinder (not shown), and the height of the outrigger 13 can be adjusted according to the situation to suppress the backward tilt of the hydraulic excavator 100 during work. The details of the configuration of the track frame 11 will be described later.

The left and right traveling devices 12 include a trailing wheel 21, a driving wheel 22, a track (crawler) 23, and a traveling driving device 24. The driven wheels 21 are rotatably supported by the front ends (left end in FIG. 1) of the left and right side frames 16 of the truck frame 11, and the drive wheels 22 are rotatably supported by the rear ends (right end in FIG. 1) of the left and right side frames 16. ing. The left and right side frames 16 of the truck frame 11 also serve as frames for the left and right traveling devices 12, respectively. The crawler belt 23 is hung around the driven wheel 21 and the driving wheel 22 in the left and right traveling devices 12, respectively. Further, in the left and right traveling devices 12, the output shafts of the traveling drive devices 24 are connected to the rotation shafts of the drive wheels 22, respectively. When the traveling drive device 24 is driven, the driven wheel 21 and the track band 23 hung around the driving wheel 22 are circulated and driven, and the traveling operation of the hydraulic excavator 100 is performed. The traveling drive device 24 includes a hydraulic motor. In the case of the hydraulic excavator 100 of the present embodiment, the length of the traveling device 12 in the longitudinal direction (at least the length of the side frame 16) is shorter than that of a general hydraulic excavator because it moves around at the bottom of the small-diameter vertical hole H. It is about the same as or shorter than the length of the swivel body 30 in the front-rear direction. In particular, in the present embodiment, when the left and right traveling devices 12 are parallel to each other (when the legs are closed as shown in FIG. 5), the outer sides of the left and right traveling devices 12 in the vehicle width direction are opposite sides of a square in a plan view. The spacing and length of the traveling devices 12 are adjusted so as to be. As a result, stability is ensured even though the traveling device 12 is short.

3. 3. Swing body The swivel body 30 includes a swivel frame (not shown), a driver's seat 32, a counterweight 33, a machine room 34, and the like. The swivel frame is a base frame of the swivel body 30, and is provided above the track frame 11 (center frame 14) via the swivel wheels 25. A swivel motor (not shown) is mounted on the swivel frame in the vicinity of the swivel wheel 25, and the output shaft of the swivel motor meshes with a gear provided on the swivel wheel 25 to allow the swivel body 30 to move with respect to the traveling body 10. Turn around the vertical axis. An electric motor can be used as the swivel motor, but a hydraulic motor is used in this embodiment.

The driver's seat 32 is arranged at a position offset to one side (left side in the present embodiment) in the left-right direction with respect to the turning center of the turning body 30. The upper side of the driver's seat 32 is covered with a canopy 35. Further, an operating device 36 is arranged at the front portion of the turning frame so as to be located on the front side of the driver's seat 32. The operation device 36 is a plurality of operation devices such as lever devices and pedals that instruct the operation of the work machine 40, the traveling body 10 and the turning body 30. The counter weight 33 is a weight for balancing the weight with the working machine 40, and is provided at the rear end of the swivel frame. The counterweight 33 in the present embodiment is integrally formed with the cover (outer wall) of the machine room 34 (also serves as a cover), and covers each device housed in the machine room 34. Further, the hydraulic excavator 100 is ultra-small, and among the columns supporting the canopy 35, the columns 35a arranged at the rear of the swivel body 30 rise from the counterweight 33 or the upper part of the cover (not shown) above the counter weight 33, and the swivel body 30 Located near the rear end.

Although not shown, the machine room 34 houses a hydraulic pump, a cooling fan, a valve unit, a hydraulic oil tank, a fuel tank, a controller 38, and the like, in addition to the electric motor 37. The electric motor 37 is a prime mover for driving a hydraulic pump. For example, the electric motor 37 is driven by electric power supplied from a generator separately from the hydraulic excavator 100 via a cable (not shown). However, instead of receiving power supply from an external power source, a power source (generator, battery, etc.) may be mounted in the machine room 34. The hydraulic pump driven by the electric motor 37 sucks in the hydraulic oil in the hydraulic oil tank and discharges it as pressure oil. The pressure oil discharged from the hydraulic pump is controlled by a valve unit that operates in response to the operation of the operating device 36 and is supplied to the corresponding hydraulic actuator. The controller 38 is a control device that controls electrical components. The hydraulic excavator 100 of the present embodiment is ultra-compact as shown in FIG. 1, and the layout of the accommodation equipment in the machine room 34 is arranged such that the controller 38 and the electric motor 37 are arranged vertically under the driver's seat 32. The swivel body 30 is configured to have an extremely small diameter by devising three-dimensionally. In this embodiment, the controller 38 is arranged above the electric motor 37. Although not shown in particular, the driver's seat 32 has a structure in which the rear portion rotates up and down with the front portion as a fulcrum, and when the rear portion of the driver's seat 32 is lifted and tilted, the upper side of the controller 38 is opened and the controller You can access 38.

4. The work machine The work machine 40 is an articulated front work machine including a work arm 41 and a work tool 44 which is an attachment, and is attached to a swivel body 30. The working arm 41 includes a boom 42, an arm 43, a boom cylinder (not shown), an arm cylinder 46, and a working tool cylinder 47. The boom 42 is rotatably connected to the front portion of the swivel body 30, the arm 43 is rotatably connected to the tip of the boom 42, and the work tool 44 is rotatably connected to the tip of the arm 43. The boom 42, arm 43, and work tool 44 all rotate with a rotation axis extending horizontally to the left and right as a fulcrum. Although FIG. 1 shows an example in which a bucket is attached as the work tool 44 and a breaker is attached as the work tool 44 in FIG. 2, other attachments can also be attached. Further, both ends of the boom cylinder are connected to the swivel body 30 and the boom 42, and both ends of the arm cylinder 46 are connected to the boom 42 and the arm 43, respectively. The base end of the work tool cylinder 47 is connected to the arm 43, while the tip end is connected to the tip end portion of the arm 43 and the work tool 44 via a link 48. The boom cylinder, arm cylinder 46, and work tool cylinder 47 are all hydraulic actuators, which are driven by the pressure oil discharged from the hydraulic pump and drive the work machine 40 by the expansion / contraction operation.

5. Truck frame FIG. 3 is a plan view of a traveling body of the hydraulic excavator shown in FIGS. 1 and 2. FIG. 3 shows a state in which the distance between the front parts of the left and right traveling devices 12 is widened (the distance between the rear parts is narrowed) and the left and right traveling devices 12 are opened in a V shape. Further, in order to clarify the structure, the upper surface plate 52 (FIG. 4) to which the swivel wheel 25 is attached in the center frame is not shown. As described above, the track frame 11 includes a center frame 14, a link 15, and a side frame 16 (FIGS. 1 and 2).

The center frame 14 is the main frame of the track frame 11, and the links 15 and the side frames 16 are connected to both the left and right sides, and the swivel body 30 is supported on the upper portion. The center frame 14 includes a lower surface plate 51, an upper surface plate 52 (FIG. 4), a front surface plate 53, a rear surface plate 54, a left side surface plate 55, and a right side surface plate 56. The front plate 53, the rear plate 54, the left side plate 55, and the right side plate 56 are vertically erect plate-like members. The center frame 14 has a configuration in which a square frame having a front plate 53, a rear plate 54, a left side plate 55, and a right side plate 56 as front, rear, left, and right surfaces is sandwiched between horizontal lower surface plates 51 and upper surface plates 52 from above and below. .. The bottom plate 51, the top plate 52, the front plate 53, the rear surface plate 54, the left side plate 55, and the right side plate 56 are fixed to each other by welding or the like.

The left and right links 15 are provided with a first arm 58 and a second arm 59, respectively. The base end of the first arm 58 is connected to the lower surface plate 51 and the upper surface plate 52 of the center frame 14 via a rotating shaft 61 extending vertically, and is a horizontal plane with respect to the center frame 14 centering on the rotating shaft 61. It is rotatable along. The rotation shafts 61 of the left and right links 15 are located on the left and right sides of the front portion of the center frame 14. The base end of the second arm 59 is connected to the tip of the first arm 58 via a rotating shaft 62 extending vertically, and the second arm 59 is centered on the rotating shaft 62 along the horizontal plane with respect to the first arm 58. It is rotatable. The tip of the second arm 59 is connected to a bracket 64 protruding inward in the vehicle width direction from the front of the side frame 16 (FIG. 1 etc.) of the truck frame 11 via a rotating shaft 63 extending vertically. .. Therefore, the second arm 59 can rotate along the horizontal plane with respect to the side frame 16 with the rotation shaft 63 as a fulcrum. Further, brackets 65 projecting inward in the vehicle width direction are provided at the rear portions of the left and right side frames 16. The bracket 65 is connected to the lower surface plate 51 and the upper surface plate 52 of the center frame 14 via a rotating shaft 66 extending vertically, and is rotatable about the rotating shaft 66 with respect to the center frame 14 along a horizontal plane. is there. These rotating shafts 66 are located on the left and right sides of the rear portion of the center frame 14.

As described above, the bracket 65 of the side frame 16 is directly connected to the center frame 14 at the rear of the left and right traveling devices 12, while the bracket 64 of the side frame 16 is centered at the front of the left and right traveling devices 12 via the link 15. It is connected to the frame 14. As a result, the left and right traveling devices 12 rotate in the horizontal direction about the rotation shaft 66, and the legs can be opened in a V shape so as to widen the distance between the front parts and narrow the distance between the rear parts. You can do it. Although not particularly shown in the present embodiment, the leg opening angles of the left and right traveling devices 12 are limited to a maximum of about 90 degrees by the stroke of the cylinder 67 or a stopper (not shown). As shown in FIG. 3, even if the left and right traveling devices 12 are opened to the maximum extent, the traveling devices 12 do not interfere with the outriggers 13. Further, the ground contact portion of the outrigger 13 is also formed in a right-angled triangular shape together with the trailing edges of the left and right traveling devices 12 when the legs are opened to the maximum.

Further, the rotating shafts 62 of the left and right links 15 are connected by one cylinder 67. The cylinder 67 extends to the left and right and is arranged through the openings provided in the left side plate 55 and the right side plate 56 of the center frame 14. As the cylinder 67 expands and contracts, the left and right traveling devices 12 open and close in a V shape as shown in FIG. 3 (the left and right traveling devices 12 both extend back and forth and are parallel to each other). become). FIG. 5 shows a plan view showing the state of the hydraulic excavator 100 working with the legs closed at the bottom of the vertical hole H, and FIG. 6 shows a plan view showing the state of the hydraulic excavator 100 working with the legs opened at the bottom of the vertical hole H. Indicated.

6. Restraint mechanism FIG. 4 is a front view of the restraint mechanism on the left side. The restraint mechanism, which is one of the features of the present embodiment, will be described with reference to FIG. 4 together with FIG. In the present embodiment, the left and right restraint mechanisms 70 for restraining the rotation (open legs) of the left and right traveling devices 12 with respect to the center frame 14 are provided. The left and right restraint mechanisms 70 include a first bracket 71 and a second bracket 72, respectively. The first bracket 71 is provided on each of the left and right sides of the front portion of the center frame 14, and has a configuration in which a horizontal plate 74 is extended forward from a vertically extending vertical plate 73 on the left and right. The second bracket 72 is provided so as to project inward in the vehicle width direction on the side frames 16 of the left and right traveling devices 12 corresponding to the first bracket 71, and sandwiches the plate 74 of the first bracket 71 up and down when the legs are closed. It has two horizontal plates 75. In FIG. 4, the second bracket 72 is represented by an imaginary line (dashed line). The plate 74 of the first bracket 71 and the plate 75 of the second bracket 72 are provided with pin holes 76 that are arranged vertically when the legs are closed. By inserting the stopper pin 77 into the pin holes 76 of the plates 74 and 75 when the legs are closed, the first bracket 71 and the second bracket 72 are connected by the stopper pin 77. The traveling device 12 on the side where the first bracket 71 and the second bracket 72 are connected by the stopper pin 77 is restrained, and even if the cylinder 67 extends, it does not rotate in the leg opening direction. For example, when only the left traveling device 12 is restrained by the stopper pin 77, the left traveling device 12 does not open even if the cylinder 67 is extended, and only the right traveling device 12 opens. A plan view of the traveling body 10 in this state is illustrated in FIG. 7, and a plan view of the hydraulic excavator 100 is illustrated in FIG. 7 is a diagram corresponding to FIG. 3 and FIG. 8 is a diagram corresponding to FIGS. 5 and 6.

Further, the first bracket 71 and the second bracket 72 are provided with stopper portions 78 that come into contact with each other when the traveling device 12 is closed. The stopper portion 78 of the first bracket 71 is provided on the end surface of the plate 74 facing outward in the vehicle width direction. The stopper portion 78 of the second bracket 72 is located between the two upper and lower plates 75 and connects the two plates 75. Both the stopper portion 78 of the first bracket 71 and the second bracket 72 are vertical plate-shaped members that extend back and forth when the legs are closed, and the first bracket 71 and the second bracket 72 are in surface contact with each other when the legs are closed. Pin holes 76 are configured to line up vertically.

Further, the left and right first brackets 71 are provided with temporary placement holes 79 for temporarily placing the stopper pins 77, in addition to the pin holes 76 into which the stopper pins 77 are inserted when connecting to the second bracket 72. .. The temporary placement hole 79 is provided at a position where the stopper pin 77 inserted therein does not interfere with the second bracket 72 regardless of the opening angle of the traveling device 12.

Further, the left and right first brackets 71 are provided with openings 82 facing the greasing port 81 for greasing the rotating shaft 61 of the link 15. Two openings 82 in the present embodiment are provided so as to sandwich the plate 74 of the first bracket 71 at the top and bottom, and a grease gun (not shown) is inserted into the greasing port 81 through the openings 82 to supply the rotating shaft 61. It is designed to be greasy.

7. Operation When excavating a vertical hole H as a deep foundation pile hole of a steel tower in a mountainous area, for example, a vertical hole H is excavated from the ground surface to a certain depth with a disassembled hydraulic excavator assembled locally, and then the hydraulic excavator 100 is excavated with a crane or the like. Is put into the inside of the vertical hole H. When operating the hydraulic excavator 100, the operator sits in the driver's seat 32 and operates the operating device 36 as appropriate. As a result, the traveling body 10 can move the hydraulic excavator 100, the working machine 40 can perform excavation work, and the swivel body 30 can be swiveled. In the excavation work, for example, as shown in FIG. 1, a bucket is used as a work tool 44 to excavate the bottom of the vertical hole H, and if necessary, a breaker is used as a work tool 44 as a work tool 44 to excavate the vertical hole H. Crush the bedrock on the bottom of the. The excavated earth and sand, gravel, etc. are scooped up with a bucket and loaded into a separately prepared container, and the container is lifted by a crane or the like and carried out of the vertical hole H.

For example, when it is necessary to open the legs and excavate the area between the left and right traveling devices 12, the stopper pin 77 is removed from the pin hole 76 and moved to the temporary storage hole 79, and the restraint by the stopper pin 77 is released to release the cylinder 67. Stretch. At that time, if the restraints are released for both the left and right traveling devices 12, both traveling devices 12 rotate as the cylinder 67 extends, and the legs are opened symmetrically (see FIGS. 3 and 6). If only one of the left and right traveling devices 12 is released from the restraint, only one traveling device 12 rotates while the other traveling device 12 is fixed as the cylinder 67 extends, and as a result, the legs open asymmetrically. (See FIGS. 7 and 8).

8. Effect (1) According to the present embodiment, since the traveling device 12 can be opened in a V shape, the legs are opened to excavate between the left and right traveling devices 12 and the left and right tracks 23 are rotated in the reverse direction. By allowing the vertical hole H to move laterally in an arc shape at the bottom of the vertical hole H. Therefore, even in a narrow vertical hole H, a small turn can be made, and even if an appropriate distance cannot be taken from the excavation point, the excavation can be performed to the lower part of the front part of the swivel body 30, so that the work can be efficiently proceeded.

At this time, in the ultra-compact hydraulic excavator 100, the traveling body 10 is also small, and the left and right traveling devices 12 are individually connected to the center frame 14 by cylinders (that is, the left and right traveling devices 12 are provided with dedicated cylinders). There is not enough room in the layout to make it a configuration. Since the structure is such that the left and right traveling devices 12 are opened by one cylinder 67, if the cylinder 67 is extended, the left and right traveling devices 12 rotate symmetrically with respect to the center frame 14 to open the legs (see FIG. 3). ). When both traveling devices 12 rotate with respect to the center frame 14, the overturning fulcrum (the front end of the ground contact surface of the left and right traveling devices 12) retracts and approaches the center of gravity of the machine. In the case of the present embodiment, as shown in FIG. 3, the fall fulcrum recedes to the front end of the center frame 14. It is not preferable to provide the outrigger 13 on the front portion of the truck frame 11 as in the rear portion because it interferes with the excavation work of the work machine 40. The more the fall fulcrum retracts, the less stable the aircraft will be.

On the other hand, in the present embodiment, by providing the restraint mechanism 70, if one traveling device 12 is restrained and the cylinder 67 is extended, only the other traveling device 12 rotates and opens the legs (see FIG. 7). ). Since one of the traveling devices 12 maintains the posture when the legs are closed, it is possible to suppress the retreat of the fall fulcrum and suppress the deterioration of the stability of the airframe as compared with the case shown in FIG.

(2) The restraint mechanism 70 has a simple structure in which the first bracket 71 on the center frame 14 side and the second bracket 72 on the traveling device 12 side are connected by a stopper pin 77. Further, since the restraining mechanism 70 restrains the front part of the traveling device 12 in the configuration in which the front portion of the traveling device 12 is opened, the force received by the restraining mechanism 70 when the cylinder 67 is extended is suppressed, and the force is stronger than necessary. There is no need to configure it properly. Therefore, it is possible to suppress an increase in the number of parts and man-hours for manufacturing due to the provision of the restraint mechanism 70.

(3) The first bracket 71 and the second bracket 72 are provided with stopper portions 78 that come into contact with each other when the legs are closed. As a result, the pin hole 76 can be easily positioned by bringing the stopper portion 78 into contact with each other, and the work of inserting the stopper pin 77 into the pin hole 76 at the time of closing the leg can be facilitated.

(4) Since the temporary placement hole 79 is provided in the first bracket 71 separately from the pin hole 76, the stopper pin 77 may be inserted into the temporary placement hole 79 when the rotational operation of the traveling device 12 is not restricted. it can. As a result, it is not necessary to be careful not to lose the removed stopper pin 77, and the operator can concentrate on maneuvering the hydraulic excavator 100.

(5) In the present embodiment, the left and right traveling devices 12 are not directly connected by the cylinder 67, but the left and right links 15 are connected by the cylinder 67. As a result, the expansion / contraction motion of the cylinder 67 can be efficiently converted into the rotational motion of the traveling device 12, and the length and stroke of the cylinder 67 can be suppressed. Further, by providing the first bracket 71 with an opening 82 facing the greasing port 81 of the rotating shaft 61 of the link 15, the greasing work on the rotating shaft 61 can be easily performed from the front of the machine body.

9. Deformation Example In the above embodiment, the case where the restraint mechanism 70 is provided for both the left and right traveling devices 12 has been described as an example, but any of the cases where the traveling devices 12 to be restrained are always the same. One may be omitted. Further, although the restraint mechanism 70 having a configuration in which the first bracket 71 and the second bracket 72 are connected by the stopper pin 77 is illustrated, the configuration of the restraint mechanism 70 can be changed as appropriate. For example, the traveling device 12 may be locked to the center frame 14 with a hook, fastened with a bolt, or the like so as to prevent the traveling device 12 from rotating.

Further, in order to obtain the above effect (3), the configuration in which the stopper portion 78 is provided on the first bracket 71 and the second bracket 72 is illustrated, but the stoppers that come into contact with each other when the legs are closed are provided on the first bracket 71 and the second bracket 72. It is not always necessary. However, the restraint mechanism 70 has a distance from the rotation shaft 66 which is the rotation fulcrum of the traveling device 12, and by providing the stopper portion 78 here, the manufacturing error of the track frame 11 and the stopper portion 78 affects the accuracy of the closed leg posture. It can be suppressed. Further, if there is no need to facilitate the positioning work of the pin hole 76 and the essential effect (1) can be obtained, the stopper portion 78 may be omitted.

Further, although the case where the temporary placement hole 79 is provided in the first bracket 71 is illustrated in order to obtain the above effect (4), the temporary placement hole 79 may be provided in a member other than the first bracket 71. For example, a holder for the stopper pin 77 may be provided at the foot of the driver's seat 32. Further, if the management of the stopper pin 77 does not pose a problem and it is sufficient to obtain the essential effect (1), the temporary placement hole 79 and the corresponding one may be omitted.

Further, in order to obtain the above effect (5), the configuration in which the opening 82 for lubrication is provided in the first bracket 71 is illustrated, but when there is no need to improve the lubrication work due to the layout, or the first bracket 71 is used. The opening 82 may be omitted if it does not interfere with the lubrication.

Further, although the configuration in which the left and right links 15 are connected by the cylinder 67 is illustrated, a configuration in which the side frames 16 of the left and right traveling devices 12 are directly connected by the cylinder 67 is also conceivable. In this case, the link 15 is not always necessary. Further, there may be a plurality of cylinders 67 as long as they can be installed. In this case, the left and right traveling devices 12 may be individually rotated by separate cylinders, but it is also conceivable to replace the cylinder unit in which a plurality of cylinders are connected to increase the stroke amount with the cylinder 67. ..

Further, a case where the invention is applied to a hydraulic excavator 100 equipped with an electric motor 37 as a prime mover for driving a hydraulic pump has been described as an example. However, when the hydraulic excavator 100 can be remotely controlled, or when exhaust gas does not matter at the operating site, an engine (internal combustion engine) may be used as a prime mover instead of the electric motor 37.

10 ... traveling body, 12 ... traveling device, 14 ... center frame, 15 ... link, 30 ... swivel body, 37 ... electric motor (motor), 40 ... working machine, 46 ... arm cylinder (hydraulic actuator), 47 ... working tool cylinder (Hydraulic actuator), 67 ... Cylinder, 70 ... Restraint mechanism, 71 ... 1st bracket, 72 ... 2nd bracket, 76 ... Pin hole, 77 ... Stopper pin, 78 ... Stopper part, 79 ... Temporary placement hole, 81 ... Supply Fat mouth, 82 ... opening, 100 ... open leg hydraulic excavator

Claims (5)

A traveling body, a swivel body provided so as to be swivel on the upper part of the traveling body, a working machine attached to the swivel body, a hydraulic actuator for driving the working machine, a hydraulic pump for discharging pressure oil for driving the hydraulic actuator, and The traveling body is provided with a prime mover for driving the hydraulic pump, and the traveling body is rotatably connected to the center frame supporting the swivel body and the center frame to expand the distance between the front parts of each other in a V shape. In an open-leg hydraulic excavator equipped with left and right traveling devices capable of opening legs and a cylinder for opening and closing the left and right traveling devices.
The left and right traveling devices are configured to open their legs up to 90 degrees.
The dimension of the traveling device in the front-rear direction is set so as to be equal to or less than the length of the turning body in the front-rear direction and the length in the vehicle width direction of the traveling body when the left and right traveling devices are parallel. ,
An outrigger provided only at the rear portion of the center frame and having a ground contact portion formed in a right-angled triangular shape along the rear edges of the left and right traveling devices at the time of maximum leg opening.
Open leg hydraulic excavator which comprising the <br/> a restraining mechanism for restraining the rotation relative to at least one of the center frame of the left and right traveling devices. In the open leg type hydraulic excavator according to claim 1.
The restraint mechanism
A first bracket provided on at least one of the left and right sides of the front portion of the center frame,
A second bracket provided on at least one of the left and right traveling devices corresponding to the first bracket,
An open-legged hydraulic excavator including a stopper pin for connecting the first bracket and the second bracket. The open-legged hydraulic excavator according to claim 2, wherein the first bracket and the second bracket are provided with stopper portions that come into contact with each other when the traveling device is closed. .. In the open leg type hydraulic excavator according to claim 2, the first bracket is positioned so as not to interfere with the second bracket, apart from the pin hole into which the stopper pin is inserted when connecting to the second bracket. An open-legged hydraulic excavator characterized in that a temporary storage hole for temporarily placing the stopper pin is provided. In the open leg type hydraulic excavator according to claim 2.
A left and right link for connecting the center frame and the left and right traveling devices is provided, and the left and right links are connected by the cylinder.
An open-legged hydraulic excavator characterized in that the first bracket is provided with an opening facing a greasing port for greasing the shaft of the link.

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