JP4105611B2 - Swivel construction machine - Google Patents

Description

  The present invention relates to a swivel construction machine that is suitably used as, for example, a hydraulic excavator, a hydraulic crane, or the like.

  In general, hydraulic excavators, hydraulic cranes, and the like are known as swing-type construction machines. For example, a hydraulic excavator includes a self-propelled lower traveling body and an upper revolving body that is rotatably mounted on the lower traveling body. And a work device provided on the front side of the upper swing body so as to be able to move up and down.

  Further, as the hydraulic excavator, there is a swing type hydraulic excavator in which the working device can swing leftward and rightward so that excavation work of a side groove can be performed, for example. The upper swing body of the swing type excavator includes a swing frame that forms a support structure having a support bracket attached to the front end side, and a swing that is swingably attached to the support bracket of the swing frame via a connecting pin. The post is configured to include a hydraulic hose provided by connecting the upper swing body and the actuator of the working device.

  The working device is attached to the swing post so as to be able to move up and down, and the swing post swings left and right by a swing actuator provided between the swing post and the swing frame.

  This swing-type hydraulic excavator has a configuration in which the hydraulic hose is passed through a swing post so that the hydraulic hose is not hooked during work and the appearance is improved. Specifically, the swing post is provided with a hose insertion port so as to communicate with the hose accommodation space formed inside the swing post, and the hydraulic hose is inserted into the hose accommodation space through the hose insertion port. And the hydraulic hose inserted in the hose accommodating space is configured to rise in the hose accommodating space and extend toward the working device (see, for example, Patent Document 1).

Japanese Utility Model Publication No. 7-29041

  By the way, in the hydraulic excavator of Patent Document 1 described above, the hydraulic hose drawn out from the upper swing body is passed through the hose housing space of the swing post, and is arranged so as to extend from the hose housing space toward the working device. Further, the hydraulic hose is set to such a length dimension that a tensile force does not act when the swing post swings on the opposite side to the position pulled out from the upper swing body.

  For this reason, when the swing post is swung to the draw-out side of the hydraulic hose, the surplus portion of the hydraulic hose is bent in the hose housing space and is slackened. Then, the slack of the hydraulic hose may come into contact with the swing post in the hose housing space, resulting in damage such as partial wear of the hydraulic hose and peeling off of the paint on the swing post.

  The present invention has been made in view of the above-described problems of the prior art. The object of the present invention is to prevent the slack portion of the hydraulic hose from coming into contact with the swing post. It is an object of the present invention to provide a swivel construction machine that can prevent the above-mentioned problem.

  According to a first aspect of the present invention, there is provided a revolving construction machine comprising: a lower traveling body; an upper revolving body having a revolving frame that is turnably mounted on the lower traveling body and having a front end side as a support bracket; and a support bracket for the revolving frame. A swing post that is swingably connected to the left and right via a connecting pin, a working device that is supported by the swing post so as to be able to be raised and lowered, and driven by an actuator, the upper swing body, and the working device. And a hydraulic hose provided so as to be connected to the actuator.

  In order to solve the above-described problem, the feature of the configuration adopted by the invention of claim 1 is that the swing post is swingably attached to the support bracket of the swivel frame via the connecting pin, Left and right side plates that are provided to project forward on the left and right sides of the rear plate and the base end side of the working device is mounted so as to be able to move up and down, and left to one of the left and right side plates, An actuator bracket that is provided protruding outward in the right direction and to which an actuator that swings a swing post is mounted; a hose housing space that is surrounded by the rear surface plate, the left side surface plate, and the right side surface plate; An actuator bracket and a hose insertion port that is provided on the opposite side of the left and right direction and through which the hydraulic hose is inserted into the hose housing space, One of the face plates is provided with a recessed portion by recessing a part on the inner surface side that defines the hose housing space, and the swing post is swung to the other side by the recessed portion. In other words, the slack of the hydraulic hose generated in the hose housing space is released.

  According to the second aspect of the present invention, the one side plate is formed such that the one side plate is formed into a three-dimensional rib shape by projecting a portion corresponding to the recessed portion to the outer surface side.

  According to the invention of claim 3, the actuator bracket is formed by using two plates facing each other in the upward and downward directions, and the recessed portion is provided at a portion corresponding to the space between the two plates. It is to have done.

  According to the invention of claim 1, the swing post is swung to the other side so that even if the hydraulic hose is slackened in the hose accommodating space, the hose accommodating space is extended to the one side plate on which the slack moves. Since the recessed portion is provided, the slack of the hydraulic hose can be released to the recessed portion provided on one side plate. As a result, since the contact between the hydraulic hose and the swing post can be prevented, damage such as partial wear of the hydraulic hose and peeling off of the coating of the swing post can be prevented, and the reliability and life can be improved. .

  According to the second aspect of the present invention, the portion projecting to the outer surface side corresponding to the recessed portion functions as a three-dimensional reinforcing rib on one side plate, so that the strength of the swing post can be increased.

  According to the invention of claim 3, since the recessed portion can be provided by utilizing the space between the two plates forming the actuator bracket, the appearance can be improved.

  Hereinafter, a small hydraulic excavator will be described as an example of a swivel construction machine according to an embodiment of the present invention, and will be described in detail with reference to FIGS.

  In FIG. 1, reference numeral 1 denotes a canopy-type hydraulic excavator as a construction machine. The hydraulic excavator 1 is a self-propelled crawler type lower traveling body 2 and an upper portion mounted on the lower traveling body 2 so as to be able to turn. It is comprised with the turning body 3. FIG. A working device 4 is provided on the front side of the upper swing body 3 so as to be able to swing and elevate.

  Here, the working device 4 includes a boom 4A attached to a swing post 12, which will be described later, an arm 4B attached to the tip of the boom 4A, and an arm 4B attached to the tip of the boom 4A. The bucket 4C is pivotally attached to the bucket 4C. A boom cylinder 4D is provided between the swing post 12 and the boom 4A, an arm cylinder 4E is provided between the boom 4A and the arm 4B, and a bucket cylinder 4F is provided between the arm 4B and the bucket 4C. These cylinders 4D, 4E and 4F constitute an actuator. Further, the working device 4 is provided with a hydraulic pipe group 4G including a plurality of hydraulic pipes extending along the rear surface of the boom 4A and connected to the boom cylinder 4D, the arm cylinder 4E, and the bucket cylinder 4F.

  Further, the upper turning body 3 is formed in a substantially circular shape when viewed from above so that it can turn substantially within the vehicle width of the lower traveling body 2 (see FIG. 2). The upper swing body 3 includes a swing frame 5, a swing post 12, a hydraulic hose group 26, a driver's seat 27, an engine, a control valve device (all not shown), and the like which will be described later.

  Reference numeral 5 denotes a revolving frame constituting a support structure for the upper revolving structure 3, and the revolving frame 5 has a flat plate shape extending in the front and rear directions in the middle in the left and right directions, as shown in FIGS. A bottom plate 6, a pair of vertical plates 7, 7 erected on the upper surface side of the bottom plate 6 so as to be separated from each other left and right; a front beam 8 positioned on the front side and extending left and right; A middle beam 9 extending leftward and rightward at the rear position of the vertical plate 7, an engine support portion 10 provided on the bottom plate 6 positioned on the rear side of the middle beam 9, and a front end of each vertical plate 7 The support bracket 11 provided on the side is roughly configured.

  Here, as shown in FIGS. 5 and 6, the support bracket 11 supports the swing post 12 so as to be swingable in the left and right directions via a connecting pin 20 described later. Further, the support bracket 11 is formed as a cylindrical body whose axis is directed upward and downward using, for example, casting, and is integrally fixed to the bottom plate 6 and the distal ends of the left and right vertical plates 7 by fixing means such as welding. Has been. In addition, a pin hole 11 </ b> A into which the connecting pin 20 is inserted is provided in the center portion of the support bracket 11 so as to penetrate upward and downward.

  Further, the outer peripheral side of the support bracket 11 is a drum-shaped body portion 11B by reducing the upper and lower intermediate portions into a drum shape. The drum-shaped body portion 11 </ b> B has a function of enlarging a space through which a hydraulic hose group 26 described later passes the side of the support bracket 11.

  A swing post 12 is attached to the support bracket 11 of the revolving frame 5, and the swing post 12 is connected to the support bracket 11 via a connecting pin 20 described later, and the left and right are centered on the connecting pin 20. It can swing in the direction. Further, the swing post 12 is integrally formed by casting or the like, for example, and supports the boom 4A of the work device 4 so as to be able to move up and down.

  As shown in FIGS. 5 to 9, the swing post 12 includes a rear plate 13, a left side plate 14, a right side plate 15, a cylinder bracket 16, a hose accommodating space 17, a hose insertion port 18, a recessed portion 19, etc. It is roughly constituted by.

  Reference numeral 13 denotes a rear plate attached to the support bracket 11. The rear plate 13 is formed by bending in a U-shape so as to sandwich the support bracket 11 from above and below, as shown in FIGS. . Further, the upper and lower ends of the rear plate 13 are an upper mounting portion 13A and a lower mounting portion 13B that extend horizontally toward the rear. Further, pin insertion holes 13A1 and 13B1 into which connecting pins 20 described later are inserted are formed in the upper attachment portion 13A and the lower attachment portion 13B so as to be coaxial with the pin hole 11A of the support bracket 11. .

  Reference numeral 14 denotes a left side plate that protrudes forward from the left side of the rear side plate 13, and an upper position of the left side plate 14 has a base of a boom 4 </ b> A constituting the work device 4 as shown in FIGS. 5 and 7. A boom boss 14 </ b> A whose end side is pin-coupled is provided. Further, a boom cylinder boss 14 </ b> B projecting inward is provided at a position closer to the lower side of the left side plate 14 and to which a base end side of a boom cylinder 4 </ b> D constituting the work device 4 is pin-coupled.

  Reference numeral 15 denotes a right side plate that protrudes forward from the right side of the rear side plate 13. Like the left side plate 14, the right side plate 15 is provided with a boom boss 15 </ b> A at the upper position, and close to the lower side. The boom cylinder boss 15B is located inwardly and protrudes inward. Further, the right side plate 15 is formed with a recessed portion 19 which will be described later by denting the inner surface side in the left and right directions.

  Reference numeral 16 denotes a cylinder bracket 16 as an actuator bracket provided on the right side of the swing post 12. The cylinder bracket 16 is integrally formed between the rear side plate 13 and the right side plate 15 on the base end side as shown in FIG. 9. The tip end side protrudes rightward and outward from the right side plate 15. Further, as shown in FIG. 7, the cylinder bracket 16 extends in the length direction so as to connect the upper plate 16A and the lower plate 16B facing each other with an interval in the upper and lower directions, and the upper plate 16A and the lower plate 16B. The connecting plate 16C is generally constituted. Furthermore, pin insertion holes 16A1 and 16B1 into which mounting pins 22 for attaching rod 21B tips of swing cylinders 21 described later are fitted are provided at the tip portions of the upper plate 16A and the lower plate 16B.

  Reference numeral 17 denotes a hose housing space provided in the swing post 12. In the hose housing space 17, a later-described hydraulic hose group 26 rises and extends. Further, the hose accommodating space 17 has a space where the hydraulic hose group 26 can be loosened when the swing post 12 swings leftward. As shown in FIGS. 5 and 6, the hose housing space 17 is surrounded by the rear plate 13, the left side plate 14, and the right side plate 15 on the rear side, the left side, and the right side, and the front side is a hose protection cover described later. It is configured as a space limited by 24.

  Reference numeral 18 denotes a hose insertion port that is located at a corner between the rear surface plate 13 and the left side plate 14 and is formed by cutting out the swing post 12. The hose insertion port 18 is mounted on the revolving frame 5. A hydraulic hose group 26, which will be described later, is drawn out from a control valve device (not shown) and extends as a substantially rectangular opening through the hose accommodating space 17 in the swing post 12.

  Reference numeral 19 denotes a concave portion provided on the right side plate 15 of the swing post 12, and the concave portion 19 is provided on the inner surface side of the right side plate 15 defining the hose accommodating space 17 as shown in FIGS. 7 to 9. It is formed so as to expand the hose accommodating space 17 in the right direction by recessing a part. Moreover, the recessed part 19 is shape | molded together at the time of casting of the swing post 12, for example, and can be formed easily.

  Specifically, as shown in FIGS. 8 and 9, the recessed portion 19 fits between the rear plate 13 and the boom cylinder boss 15B and between the upper plate 16A and the lower plate 16B of the cylinder bracket 16. By projecting a part of the right side plate 15 to the outer surface side, it is formed as a bottomed concave groove extending upward and downward. As a result, the right side plate 15 is provided with a front wall portion 19A, a rear wall portion 19B, and a bottom wall portion 19C that constitute the recessed portion 19. Further, the front wall portion 19A, the rear wall portion 19B, and the bottom wall portion 19C protrude between the upper plate 16A and the lower plate 16B of the cylinder bracket 16 and are formed with a sense of unity with the cylinder bracket 16.

  In this way, the recessed portion 19 has a three-dimensional rib shape of the right side plate 15 by the front wall portion 19A, the rear wall portion 19B, and the bottom wall portion 19C by denting a part of the right side plate 15 to the cylinder bracket 16 side. It is possible to increase the strength of the right side plate 15. In addition, the front wall portion 19A, the rear wall portion 19B, and the bottom wall portion 19C that form the recessed recess portion 19 are provided so as to protrude between the upper plate 16A and the lower plate 16B of the cylinder bracket 16, and therefore from the outside. It is hard to see.

  Then, as shown in FIG. 10, the recessed portion 19 is a slack 26 </ b> B that moves toward the right side plate 15 when the later-described hydraulic hose group 26 generates a slack 26 </ b> B by swinging the swing post 12 to the left. A part of the slack 26B is accommodated to prevent the slack 26B from coming into contact with the right side plate 15.

  Reference numeral 20 denotes a connection pin (shown in FIGS. 6 and 10) that connects the support bracket 11 and the swing post 12 of the swivel frame 5 so as to be swingable. The connection pin 20 extends upward and downward. The rear plate 13 constituting the swing post 12 and the pin insertion holes 13A1, 13B1 of the rear plate 13 and the pin holes 11A of the support bracket 11 constituting the revolving frame 5 are inserted upward and downward. Has been. Thereby, the connecting pin 20 is attached to the front end portion of the swing frame 5 so that the swing post 12 can swing leftward and rightward.

  A swing cylinder 21 is provided between the swing frame 5 and the swing post 12, and the swing cylinder 21 is provided to extend in the front and rear directions as indicated by a dotted line in FIG. The swivel frame 5 is attached via a connecting pin (not shown). On the other hand, the tip of the rod 21 </ b> B is attached to the tip of the cylinder bracket 16 of the swing post 12 via a mounting pin 22. The swing cylinder 21 can swing the swing post 12 to the right about the connecting pin 20 by reducing the rod 21B. Further, by extending the rod 21B, the swing post 12 can be swung to the left.

  An attachment plate 23 is provided on the upper side of the swing post 12, and the attachment plate 23 is attached to the upper attachment portion 13 </ b> A of the rear plate 13 constituting the swing post 12. The attachment plate 23 attaches a hose protection cover 24 and a hose clamp 25 described later to the swing post 12.

  Reference numeral 24 denotes a hose protection cover that covers the front side of the hose housing space 17. The hose protection cover 24 protects the hydraulic hose group 26 in the hose housing space 17 from flying stones and the like. The hose protection cover 24 is formed, for example, by bending a thin steel plate or the like as shown in FIGS. 5 and 8, and the upper side is attached to the mounting plate 23 and the lower side is attached to the lower mounting portion 13B. ing.

  Reference numeral 25 denotes a hose clamp provided on the upper side of the swing post 12. The hose clamp 25 is attached to the attachment plate 23 together with the hose protection cover 24. The hose clamp 25 holds a hydraulic hose group 26, which will be described later, in an aligned state in the left and right directions.

  The hose clamp 25 holds the hydraulic hose group 26 at a position closer to the upper side of the swing post 12, so that the hydraulic hose group 26 swings the swing post 12 in the hose accommodating space 17. The hydraulic hose group 26 can be moved in the upward and downward directions on the working device 4 side so as to follow the vertical movement of the working device 4. Thus, the hose clamp 25 distinguishes the moving direction of the hydraulic hose group 26 and suppresses rubbing against each other.

  On the other hand, reference numeral 26 denotes a plurality of hydraulic hoses (collectively referred to as “hydraulic hose group 26”). The hydraulic hose group 26 is pulled out from a control valve device (not shown) mounted on the swing frame 5 to be operated. It extends toward 4. The hydraulic hose group 26 includes, for example, two hydraulic hoses 26 that supply and discharge pressure oil to and from the boom cylinder 4D, two hydraulic hoses 26 that supply and discharge pressure oil to and from the arm cylinder 4E, and a bucket. In addition to the two hydraulic hoses 26 for supplying and discharging pressure oil to and from the cylinder 4F, for example, two preliminary hydraulic pressures for supplying and discharging pressure oil to an external hydraulic device (not shown) such as a rock drill or the like A total of eight hydraulic hoses including the hose 26 are included.

  The proximal end side of the hydraulic hose group 26 is connected to the control valve device, and the distal end side (excluding the spare hydraulic hose 26) is connected to the hydraulic piping group 4G of the work device 4. In addition, the hydraulic hose group 26 is inserted into the hose housing space 17 from the hose insertion opening 18 of the swing post 12, with a midway portion 26 </ b> A passing through the left side of the drum-shaped body 11 </ b> B of the support bracket 11. Further, the hydraulic hose group 26 inserted into the hose accommodating space 17 rises in the hose accommodating space 17 and is held by the upper hose clamp 25.

  Here, the middle portion 26A of the hydraulic hose group 26 is pulled by the hose clamp 25 and extends in the hose accommodating space 17 when the swing post 12 is swung to the right. On the other hand, when the swing post 12 is swung to the left side, the surplus part 26A of the hydraulic hose group 26 forms a slack 26B due to bending of the surplus portion in the hose accommodating space 17. The slack 26 </ b> B increases as the swing post 12 is swung to the left, and moves so as to approach the right side plate 15.

  A driver seat 27 is provided on the turning frame 5 and is seated by an operator (see FIG. 1). The driver seat 27 is covered with a canopy 28. Further, the rear side, the right side, and the like of the canopy 28 are covered with an exterior cover 29.

  The hydraulic excavator 1 according to the present embodiment has the above-described configuration. Next, the operation when the side groove digging work is performed using the working device 4 and the movement of the hydraulic hose group 26 at this time will be described.

  First, when the work device 4 is moved to the left side of the lower traveling body 2 to perform the side groove digging work, the rod 21B of the swing cylinder 21 is reduced to swing the swing post 12 to the right side, and the upper swing body 3 is operated. The working device 4 is translated to the left side by turning to the left side opposite to the swinging direction of the device 4, and the left side grooving operation is performed using the working device 4. On the other hand, when the working device 4 is moved to the right side of the lower traveling body 2 to perform the side grooving work, the working device 4 is used by swinging the swing post 12 to the left side and turning the upper turning body 3 to the right side. Do the right side ditching.

  Here, when the swing post 12 is swung to the right side, the hydraulic hose group 26 is in a state of being extended in the hose accommodating space 17 by pulling a portion 26A in the middle thereof. On the other hand, as shown in FIG. 10, when the swing post 12 is swung to the left side, the hydraulic hose group 26 has a slack 26B in the hose housing space 17 due to the surplus portion 26A, and this slack 26B is the right side plate. Move towards 15 while getting bigger.

  However, since the concave portion 19 is provided in the right side plate 15 so as to expand the hose accommodating space 17, the slack 26 </ b> B of the hydraulic hose group 26 can be released to the concave portion 19. As a result, the frictional contact between the hydraulic hose group 26 and the swing post 12 can be prevented.

  Thus, according to the present embodiment, the right side plate 15 of the swing post 12 is provided with the recessed portion 19 on the inner surface side that is the hose accommodating space 17 side. Therefore, the slack 26B of the hydraulic hose group 26 generated in the hose accommodating space 17 when the swing post 12 is swung to the left can be released by entering the recessed portion 19, and this slack 26B and the right side plate Contact with 15 can be avoided.

  As a result, frictional contact between the hydraulic hose group 26 and the swing post 12 can be prevented, so that wear of the hydraulic hose 26, damage to the swing post 12 and the like can be prevented, and reliability and life can be improved.

  Further, the right side plate 15 can be formed into a three-dimensional rib shape by the front wall portion 19A, the rear wall portion 19B, and the bottom wall portion 19C constituting the recessed portion 19, so that the strength of the right side plate 15 is improved. The rigidity of the swing post 12 can be increased.

  Furthermore, since the front wall portion 19A, the rear wall portion 19B, and the bottom wall portion 19C that form the recessed portion 19 are provided so as to protrude between the upper plate 16A and the lower plate 16B of the cylinder bracket 16, the outer side Can be formed with a sense of unity with the cylinder bracket 16, and the appearance can be improved.

  In the embodiment, the case where the recessed portion 19 is provided in the right side plate 15 of the swing post 12 has been described as an example. However, the present invention is not limited to this, and a hose insertion port is provided on the right side of the swing post, and when the hydraulic hose group is inserted from the right hose insertion port into the hose housing space, Since the slack moves to the left side, the left side plate may be provided with a recessed portion.

  Further, in the embodiment, the case where the recessed recess portion 19 is provided between the upper plate 16A and the lower plate 16B of the cylinder bracket 16 is illustrated, but the present invention is not limited to this, and for example, the cylinder bracket 16 The upper plate 16A may be formed on the upper side and the lower plate 16B may be formed on the lower side.

  Furthermore, in the embodiment, the canopy-spec hydraulic excavator 1 in which the canopy 28 is mounted on the revolving frame 5 is described as an example of the construction machine. However, the present invention is not limited to this, and may be applied to a cab specification hydraulic excavator including a cab that covers the periphery of the driver's seat.

It is a front view which shows the hydraulic excavator applied to embodiment of this invention. FIG. 2 is a plan view of the hydraulic excavator in FIG. 1. It is a front view which expands and shows a turning frame. It is a top view which expands and shows a turning frame. It is an enlarged front view which expands and shows the front end side of a revolving frame, a swing post, a hydraulic hose group, and the like. FIG. 6 is a cross-sectional view of the front end side of the revolving frame, the swing post, the hydraulic hose group, and the like as seen from the direction of arrows VI-VI in FIG. 5. It is an external appearance perspective view which expands and shows a swing post alone. It is a longitudinal cross-sectional view of the swing post seen from the arrow VIII-VIII direction in FIG. FIG. 9 is a transverse cross-sectional view of the swing post as viewed from the direction indicated by arrows IX-IX in FIG. 8. It is a cross-sectional view which shows the state which rock | fluctuated the swing post to the left side, and accommodated the slack of the hydraulic hose group in the recessed part from the same position as FIG.

Explanation of symbols

1 Excavator (construction machine)
2 Lower traveling body 3 Upper revolving body 4 Working device 4D Boom cylinder (actuator)
4E Arm cylinder (actuator)
4F Bucket cylinder (actuator)
5 Revolving frame 11 Support bracket 12 Swing post 13 Rear plate 14 Left side plate 15 Right side plate 16 Cylinder bracket (actuator bracket)
16A Upper plate 16B Lower plate 17 Hose accommodating space 18 Hose insertion port 19 Recessed portion 20 Connecting pin 21 Swing cylinder (actuator)
26 Hydraulic hoses (hydraulic hoses)
26A midway part 26B slack

Claims (3)

A lower swinging body, an upper swinging body having a swinging frame that is pivotably mounted on the lower traveling body and that has a support bracket on the front end side, and swings in the left and right directions via a connecting pin to the support bracket of the swinging frame. A swing post that is movably connected, a working device that is supported by the swing post so as to move up and down, and is driven by an actuator, and a hydraulic pressure that is provided between the upper swing body and the actuator of the working device. In a swivel construction machine comprising a hose,
The swing post includes a rear plate swingably attached to the support bracket of the swivel frame via the connecting pin, and is provided to protrude forward on both the left and right sides of the rear plate.ア ク チ ュ エ ー タ Actuator to which left and right side plates that can be moved up and down, and an actuator that protrudes outward in the left and right directions on one of the left and right side plates and swings the swing post A hose housing space surrounded by a bracket, the rear plate, the left side plate, and the right side plate, and extending the hydraulic hose, and the hydraulic hose provided on the opposite side of the actuator bracket to the left and right directions Is constituted by a hose insertion port that is inserted into the hose housing space,
One side plate of the left and right side plates is provided with a recessed portion by recessing a part of the inner surface side defining the hose accommodating space, and the swing post is provided on the other side by the recessed portion. A swing-type construction machine characterized in that the slack of the hydraulic hose generated in the hose housing space is released when the hose is swung to the right.   2. The swivel construction machine according to claim 1, wherein the one side plate is formed into a three-dimensional rib shape by projecting a portion corresponding to the recessed portion to the outer surface side. .   3. The actuator bracket is formed by using two plates facing each other with an interval in the upper and lower directions, and the recessed portion is provided at a portion corresponding to the space between the two plates. A swivel construction machine described in 1.

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