JP2006193914A - Slewing construction machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To increase working efficiency in assembling by efficiently mounting a bottom plate of a revolving frame on an outer ring of a slewing ring. <P>SOLUTION: The round body 5 of a lower structure 2 is formed longer in the vertical direction, and its height is set to H. The slewing ring 35 rotatably supporting the revolving frame 11 of an upper structure on the lower structure 2 is formed by fixing its inner ring 36 to the upper surface of the round body 5 and securing a space S larger than a bolt 40 between the lower surface of the outer ring 38 and the upper surface 4A of a rack center frame 4 by the round body 5. Also, the left guard member 22 and the right guard member 23 of the revolving frame 11 are formed by disposing their upper surfaces 22A and 23A on the approximately same plane as the upper surface 13A of the bottom plate 13 and disposing lower surfaces 22B and 23B at positions lower than the lower surface 13B of the bottom plate 13. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a swivel construction machine suitably used for a hydraulic excavator or the like that performs excavation work such as earth and sand.

  In general, a swivel construction machine such as a hydraulic excavator is a self-propelled lower traveling body, an upper revolving body having a revolving frame mounted on the lower traveling body via a swirl wheel, and the upper revolving body. It is generally configured by a working device that is provided on the front side of the body and performs soil excavation work and the like.

  In this type of prior art swivel construction machine, the swivel frame of the upper swivel body is a swivel main frame as a center frame located in the center thereof, and side frames provided on both the left and right sides of the swivel main frame. And left and right guard members. The turning main frame includes a bottom plate mounted on the lower traveling body via a turning wheel, and left and right vertical plates that are erected upward from the bottom plate and extend in the front and rear directions of the bottom plate. (For example, refer to Patent Document 1).

  Further, the lower traveling body is provided with a track frame, and a circular cylinder made of a circular ring is provided on the upper surface of the central portion of the track frame. The inner ring of the swivel wheel is detachably fixed to the upper surface of the round cylinder using bolts, and the bottom plate of the swivel frame is detachably attached to the outer ring of the swirl ring using a plurality of bolts. It can be attached.

JP 2003-129522 A

  By the way, in the above-described prior art, when assembling a revolving frame composed of the revolving main frame and the left and right guard members, the lower surface of the guard member is arranged on the same plane as the upper surface of the bottom plate. The turning main frame and the left and right guard members are aligned in the upward and downward directions.

  In addition, the swivel main frame and the left and right guard members are aligned in the up and down directions so that the lower surface of the guard member is disposed on substantially the same plane as the lower surface of the swivel main frame (bottom plate). Some of them are

  In addition, in a swivel construction machine such as a hydraulic excavator, the center of gravity of the entire vehicle is reduced by making the gap in the downward direction as small as possible formed between the crawler belt of the lower traveling body and the guard member of the swivel frame. By lowering the value, the sense of balance, stability, etc. are increased.

  For this reason, in the conventional swivel construction machine, after attaching the inner ring of the swivel ring on the round body of the track frame and then trying to fasten the bottom plate of the swivel frame to the upper surface side of the outer ring with bolts, the lower surface of the outer ring and the track There is a problem that a space for inserting a bolt cannot be secured between the frame and the outer ring of the turning wheel and the bottom plate of the turning frame are difficult to fasten with the bolt.

  Therefore, in the case of the prior art, before attaching the inner ring of the turning wheel to the round body of the track frame, measures such as inserting the bolt in advance into a bolt insertion hole provided in the outer ring of the turning wheel are taken. . However, even when such measures are taken, the space between the lower surface of the outer ring and the track frame is small, so that there is a problem that it is difficult to perform assembly work efficiently and workability is very poor.

  The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to efficiently perform the work of mounting the bottom plate of the turning frame on the outer ring of the turning wheel, and to improve the workability during assembly. Another object of the present invention is to provide a swivel construction machine that can improve the appearance balance and stability of the upper swing body relative to the lower traveling body.

  In order to solve the above-described problems, the present invention provides a lower traveling body in which a circular cylinder is provided on the upper surface of the central portion of a track frame, an inner ring fixed to the circular cylinder of the lower traveling body, and an outer peripheral side of the inner ring. A turning wheel comprising an outer ring rotatably provided via a plurality of rolling elements, and an upper turning body on which a turning frame is turnably mounted on the lower traveling body via the turning wheel, A swing frame of the upper swing body includes a bottom plate that is detachably attached to the outer ring of the swing wheel, a swing main frame that is erected upward from the bottom plate and extends to the front and rear, and left and right vertical plates, and the swing The present invention is applied to a swivel construction machine constituted by left and right guard members provided on both the left and right sides of the main frame.

  According to the first aspect of the present invention, the outer ring of the turning wheel and the bottom plate of the turning main frame are fixed using a plurality of fastening members inserted upward from the lower surface side of the outer ring. The guard member has a configuration in which the upper surface of the guard member is arranged at a height position in the upper and lower directions that is equal to or lower than the bottom plate of the turning main frame.

  According to a second aspect of the present invention, the track frame of the lower traveling body includes a track center frame provided with the round cylinder on the upper surface side, and front and rear directions located on both the left and right sides of the track center frame. The left and right track side frames are provided with left and right crawler belts, and the upper and lower lengths of the round cylinder are between the upper surface of the track center frame and the lower surface of the outer ring. It is set as the structure which forms a fastening member in the dimension which can be arrange | positioned.

  According to a third aspect of the present invention, the guard member of the revolving frame is configured such that its lower surface is disposed at a position below the lower surface of the bottom plate.

  According to a fourth aspect of the present invention, the bottom plate of the swivel main frame is provided with a weight plate that constitutes a part of the counterweight on the lower surface on the rear side.

  As described above, according to the first aspect of the invention, the outer ring of the turning wheel and the bottom plate of the turning main frame are fixed by the plurality of fastening members inserted upward from the lower surface side of the outer ring, and the turning frame is provided. Since the upper surface of the guard member is arranged at the height position in the lower direction which is equal to or lower than the bottom plate of the swivel main frame, for example, the round body of the lower traveling body is used as a fastening member such as a bolt. Even if the inner ring of the turning wheel is fixed to the upper surface of the round cylinder by forming the upper and lower dimensions to be long, the bolt (fastening) is between the lower surface of the outer ring and the track frame. The space for inserting the member) into the bolt insertion hole of the outer ring from the lower side can be secured, and the bolt fastening operation can be easily performed from the lower side of the outer ring. Further, the upper surface of the guard member is formed between the crawler belt of the lower traveling body and the guard member, for example, by arranging the upper surface of the guard member at a height position equal to or lower than the bottom plate of the turning main frame. The upper and lower dimensions of the gap can be kept small.

  Accordingly, the gap between the lower traveling body and the upper swinging body can be reduced, and the appearance balance and stability of the upper swinging body with respect to the lower traveling body can be enhanced. In addition, the work of attaching the bottom plate of the turning frame to the outer ring of the turning wheel by using a plurality of fastening members can be performed efficiently, and the workability during assembly can be improved.

  According to the invention described in claim 2, the round body of the lower traveling body has an upper and lower length dimension in which a fastening member can be disposed between the upper surface of the track center frame and the lower surface of the outer ring. Therefore, even when the inner ring of the turning wheel is fixed to the upper surface of the round cylinder, a bolt (fastening member) is placed between the upper surface of the track center frame and the lower surface of the outer ring in the bolt insertion hole of the outer ring. A space for insertion from the outer ring can be secured, and the bolt fastening operation can be easily performed from the lower side of the outer ring.

  On the other hand, in the invention according to claim 3, since the lower surface of the guard member is arranged at a position below the lower surface of the bottom plate, for example, an upper portion formed between the crawler belt of the lower traveling body and the guard member. , The gap in the downward direction can be kept small, and the sense of balance and stability of the upper revolving structure relative to the lower traveling structure can be improved.

  Further, according to the invention described in claim 4, the weight of the counterweight provided on the upper side of the bottom plate is provided on the bottom plate of the swivel main frame by providing a weight plate constituting a part of the counterweight on the lower surface on the rear side. The volume can be reduced by the amount of the weight plate, and the turning radius of the upper turning body can also be reduced by this.

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

  Here, FIG. 1 to FIG. 11 show a first embodiment of the present invention. In the figure, reference numeral 1 denotes a hydraulic excavator as a swivel construction machine, and the hydraulic excavator 1 includes a lower traveling body 2, an upper revolving body 10 described later, a work device 46, and the like. The lower traveling body 2 is composed of a track frame 3 and a crawler belt 9 which will be described later.

  Reference numeral 3 denotes a track frame constituting a frame of the lower traveling body 2. The track frame 3 includes a track center frame 4 located in the center as shown in FIGS. 1 to 4, and left and right sides of the track center frame 4. It is generally constituted by left and right track side frames 6 and 6 provided on both sides via leg portions 7 and 8 which will be described later.

  Reference numeral 5 denotes a circular cylinder constituting a part of the track center frame 4, and the circular cylinder 5 is formed as a circular ring body of a steel material having high rigidity and the like. The upper surface 4A) is provided by means such as welding. The round cylinder 5 protrudes upward from the upper surface 4A of the track center frame 4, and a rotating wheel 35 described later is fixed to the upper surface with bolts 39 or the like as shown in FIG.

  In this case, the round cylinder 5 has a height dimension H as the upper and lower dimensions as shown in FIGS. 9 to 11, and the upper and lower dimensions are longer than those of the conventional round cylinder. Is formed. A space S larger than the bolt 40 described later is secured by the round cylinder 5 between the lower surface of the outer ring 38 described later and the upper surface 4A of the track center frame 4.

  Reference numerals 6 and 6 denote left and right track side frames provided on the left and right sides of the track center frame 4 via front and rear legs 7 and 8, respectively. These track side frames 6 and 6 are shown in FIG. As shown in FIG. 2, the track center frame 4 is located on both the left and right sides of the track center frame 4 and extends in the front and rear directions, respectively.

  9 and 9 are a pair of left and right crawler belts provided on the track side frames 6 and 6 of the lower traveling body 2, and these crawler belts 9 surround the track side frame 6 from the outside as shown in FIGS. It extends forward and rearward and is driven to travel by a traveling hydraulic motor (not shown) or the like.

  Reference numeral 10 denotes an upper swing body which is mounted on the track center frame 4 of the lower traveling body 2 so as to be swingable via a swing wheel 35. The upper swing body 10 includes a swing frame 11 which will be described later as shown in FIGS. A floor plate 41, a driver seat 42, a canopy 43, an exterior cover 44, a counterweight 45, and the like, which will be described later, are provided on the upper side of the revolving frame 11.

  Reference numeral 11 denotes a revolving frame constituting a frame of the upper revolving structure 10, and the revolving frame 11 includes a revolving main frame 12, a left guard member 22, a right guard member 23, and the like, which will be described later, as shown in FIGS. It is comprised by.

  Reference numeral 12 denotes a turning main frame constituting a central portion of the turning frame 11, and the turning main frame 12 includes a bottom plate 13, a left front vertical plate 14, a right front vertical plate 15, a left rear vertical plate 16, a right rear vertical plate 17, which will be described later. The partition plate 18, the weight mounting portion 20, the weight plate 21, and the like are included.

  13 is a bottom plate of the turning main frame 12, and the bottom plate 13 is made of a flat plate material extending in the front and rear directions, and the left and right width dimensions are slightly larger than the outer diameter of the turning wheel 35 described later. It has become. As shown in FIGS. 6, 9 and 10, the bottom plate 13 has an upper surface 13A disposed on the same plane as a left guard member 22 and a right guard member 23 which will be described later. It is disposed at a position above the guard member 22 and the right guard member 23.

  Further, the bottom plate 13 is formed with a number of bolt holes 13C, 13C,... Concentrically around the turning center O shown in FIG. 5, and these bolt holes 13C are shown in FIGS. As will be described later, a bolt 40 described later is screwed. Thereby, the bottom plate 13 of the turning frame 11 is attached to the round body 5 of the lower traveling body 2 through the turning wheel 35 so as to be turnable.

  Reference numerals 14 and 15 denote left and right vertical plates (hereinafter referred to as a left front vertical plate 14 and a right front vertical plate 15) which are positioned on the front side of the bottom plate 13 and are erected on the upper surface side of the bottom plate 13. The right front vertical plate 15 extends in the front and rear directions parallel to each other on the bottom plate 13 as shown in FIGS. 5 to 7, and its rear end is joined (welded) to a partition plate 18 described later.

  And the upper end side located in the longitudinal direction intermediate part of the left front vertical board 14 and the right front vertical board 15 becomes mounting bracket 14A, 15A to which the lower boom 46A of the working device 46 described later is pin-coupled so as to be able to move up and down. . Further, the left front vertical plate 14 and the right front vertical plate 15 are disposed at positions offset to the right by a predetermined dimension with respect to the turning center O of the upper turning body 10 as shown in FIG.

  Further, a protruding plate portion 14B is integrally provided on the front end side of the left front vertical plate 14, and a left front frame portion 25 of a left guard member 22 described later is joined to the protruding plate portion 14B by welding or the like. A protruding plate portion 15B is also integrally provided on the front end side of the right front vertical plate 15, and a right front frame portion 28 of a right guard member 23 described later is joined to the protruding plate portion 15B by welding or the like. It is.

  Reference numerals 16 and 17 denote left and right rear vertical plates (hereinafter referred to as a left rear vertical plate 16 and a right rear vertical plate 17) provided on the rear side of the bottom plate 13, and the left rear vertical plate 16 and the right rear vertical plate 17. Is provided on the rear upper surface side of the bottom plate 13 so as to extend forward and rearward. The left rear vertical plate 16 and the right rear vertical plate 17 are located on the rear side of a partition plate 18 described later, and are arranged far apart in the left and right directions as compared with the left front vertical plate 14 and the right front vertical plate 15. It is installed.

  In this case, the front end of the left rear vertical plate 16 is joined to a partition plate 18 described later at a position spaced left and right from the left front vertical plate 14. The right rear vertical plate 17 is arranged to be continuous with the partition plate 18 on the rear side of the right front vertical plate 15, and the front end thereof is joined to the partition plate 18.

  Reference numeral 18 denotes a partition plate that is erected and extends in the left and right directions at an intermediate position in the front and rear directions of the bottom plate 13. The partition plate 18 is sandwiched between the right front vertical plate 15 and the right rear vertical plate 17. It extends to the left side from the position to the position of the left guard member 22 beyond the left front vertical plate 14 and the left rear vertical plate 16. The partition plate 18 increases the strength of the revolving frame 11 and defines an engine housing space 19 on the rear side of the revolving frame 11.

  That is, an engine (not shown) serving as a prime mover of the hydraulic excavator is disposed on the bottom plate 13 in the engine housing space 19. The partition plate 18, for example, blocks the floor plate 41 side from the engine housing space 19, thereby suppressing the noise from the engine from being transmitted to the driver seat 42 on the floor plate 41 shown in FIGS. 1 and 2. It is.

  Reference numeral 20 denotes a weight mounting portion fixed to the upper surface of the rear end side of the bottom plate 13 by means of welding or the like. The weight mounting portion 20 is a thick wall extending in the left and right directions as shown in FIGS. It is made of a plate material or the like, and is joined and provided between the upper surface of the rear end side of the bottom plate 13 and the rear ends of the left rear vertical plate 16 and the right rear vertical plate 17. A counterweight 45 described later is detachably attached to the weight attaching portion 20 using a bolt or the like.

  A weight plate 21 is provided on the rear lower surface of the bottom plate 13 by means of welding or the like. The weight plate 21 is formed using a thick plate material as shown in FIGS. 6 and 8, and its lower surface 21A. Are arranged on substantially the same plane as lower surfaces 22B and 23B of guard members 22 and 23 to be described later. The weight plate 21 has the same function as a counterweight 45 described later on the rear side of the bottom plate 13 and constitutes a part of the counterweight 45.

  22 and 23 are left and right guard members (hereinafter referred to as a left guard member 22 and a right guard member 23) that constitute a part of the revolving frame 11, and the left guard member 22 and the right guard member 23 are shown in FIG. As shown in FIGS. 7 and 8, they are arranged on both the left and right sides of the turning main frame 12 (bottom plate 13) via projecting beams 30, 31 and the like which will be described later.

  9 and 10, the left guard member 22 has an upper surface 22A disposed on the same plane as the upper surface 13A of the bottom plate 13, and its lower surface 22B is the lower surface 13B of the bottom plate 13. It is arrange | positioned in the position which becomes below. Further, the upper surface 23A of the right guard member 23 is also disposed on the same plane as the upper surface 13A of the bottom plate 13, and the lower surface 23B is disposed at a position below the lower surface 13B of the bottom plate 13.

  Here, the left guard member 22 has a left bent frame portion 24 as an arcuate frame curved in an arc shape with respect to the turning center O shown in FIG. 5 and the left and right directions from the front portion of the turning main frame 12. A left front frame portion 25 composed of a left-side frame member extending linearly, and a left joint portion that connects the front end side (the left and right outer end portions) of the left front frame portion 25 to the front end of the left bent frame portion 24 26.

  In this case, the left bent frame portion 24 of the left guard member 22 is a cylindrical hollow frame material (pipe material) whose cross section is substantially triangular or D-shaped as illustrated in FIG. It is formed by bending into an arc shape based on the turning center O. And the length direction middle part of the left bending frame part 24 is connected with the length direction intermediate part of the baseplate 13 via the overhang | projection beam 30 etc. which are mentioned later.

  Further, the left front frame portion 25 of the left guard member 22 is also formed using a cylindrical hollow frame material having a substantially triangular or D-shaped cross section as illustrated in FIG. However, the left front frame portion 25 extends linearly in the left and right directions as shown in FIGS. 5 to 8, and the inner end portion is provided with means such as welding to the overhanging plate portion 14 </ b> B of the left front vertical plate 14. Fixed (connected).

  Moreover, the left joint part 26 is shape | molded as a solid cast component using materials, such as cast steel, for example. Then, the front end of the left bent frame portion 24 and the outer end portion of the left front frame portion 25 are concavo-convexly fitted to both ends of the left joint portion 26. In this state, both are joined by means such as welding. Is.

  On the other hand, the right guard member 23 also linearly extends from the front portion of the turning main frame 12 to the left and right directions, as a right bent frame portion 27 as an arcuate frame curved in an arc shape with respect to the turning center O. The right front frame portion 28 made of the right frame member and the right joint portion 29 that connects the front end side (the left and right outer ends) of the right front frame portion 28 to the front end of the right bent frame portion 27. ing.

  The right bent frame portion 27 of the right guard member 23 is formed by bending a hollow frame material into an arc shape with the turning center O as a reference, like the left bent frame portion 24 of the left guard member 22. . Further, the inner front end of the right front frame portion 28 is also fixed (connected) to the overhanging plate portion 15B of the right front vertical plate 15 by means of welding or the like.

  Further, the right joint portion 29 is formed as a solid cast part using a material such as cast steel, like the left joint portion 26. Then, the front end of the right bent frame portion 27 and the outer end portion of the right front frame portion 28 are concavo-convexly fitted to both ends of the right joint portion 29, and in this state, both are fixed by means such as welding. Is.

  Reference numeral 30 denotes a left extension beam for connecting the left guard member 22 to the turning main frame 12, and the extension beam 30 has a base end on the bottom plate 13 of the turning main frame 12, etc. as shown in FIGS. The distal end side is joined to the left bent frame portion 24 of the left guard member 22. The overhanging beam 30 is also joined to the lower end side of the partition plate 18 to increase the joining strength of the left guard member 22 to the turning main frame 12.

  Reference numeral 31 denotes a right extension beam that connects the right guard member 23 to the turning main frame 12. The extension beam 31 is joined to the bottom plate 13 of the turning main frame 12 on the base end side, and the right guard member 23 on the distal end side. The right bending frame portion 27 is joined. The overhanging beam 31 increases the bonding strength of the right guard member 23 with respect to the turning main frame 12.

  Reference numerals 32 and 33 denote connection fittings for connecting the rear end sides of the left and right guard members 22 and 23 to the rear portion of the turning main frame 12, and the connection fittings 32 and 33 are, for example, weldable metal plates such as steel plates. As shown in FIG. 5, it is formed by bending (press molding) into an L shape. And the connection metal fittings 32 and 33 connect the rear end side of the left bending frame part 24 and the right bending frame part 27 to the rear vertical plates 16 and 17 side of the turning main frame 12 using welding means.

  Reference numeral 34 denotes a floor board support plate that is positioned on the upper front side of the left guard member 22 and extends leftward and rightward. The floorboard support board 34 has a front side portion of a floor board 41 (see FIG. 1) described below. Support from the side. The rear portion of the floor plate 41 is supported from below by a support member (not shown) provided behind the partition plate 18 of the revolving frame 11.

  Reference numeral 35 denotes a turning wheel provided between the round body 5 of the lower traveling body 2 and the bottom plate 13 of the turning frame 11, and the turning wheel 35 is fixed to the upper surface of the round body 5 as shown in FIGS. An inner ring 36 having inner teeth 36A formed on the inner peripheral side, and an outer ring 38 rotatably provided on the outer peripheral side of the inner ring 36 via steel balls 37, 37,... As rolling elements. Yes.

  Here, the inner ring 36 of the turning wheel 35 is abutted so as to overlap the upper surface of the circular cylinder 5, and is fixed to the circular cylinder 5 by a large number of bolts 39 in this state. Further, as shown in FIG. 10, the outer ring 38 is provided with a large number of bolt insertion holes 38A, and these bolt insertion holes 38A are arranged at positions facing the bolt holes 13C of the bottom plate 13 above and below. Is.

  40, 40,... Are bolts as fastening members for fastening the bottom plate 13 of the turning frame 11 to the outer ring 38 of the turning wheel 35. These bolts 40 are connected to the upper surface 4A of the track frame 3 as shown in FIGS. By using the upper and lower spaces S formed between the lower surface of the outer ring 38 and the outer ring 38, the bolts are inserted into the bolt insertion holes 38A from the lower surface side of the outer ring 38.

  Then, in this state, each bolt 40 has its tip (upper end) side screwed into the bolt hole 13C of the bottom plate 13, whereby the bottom plate 13 of the revolving frame 11 is attached to the outer ring 38 of the revolving ring 35 as shown in FIG. It is detachably fixed. Thus, the turning frame 11 is mounted on the track frame 3 via the turning wheel 35, and is turned left and right with respect to the turning center OO.

  41 is a floor board provided on the revolving frame 11, and the floor board 41 is provided on the revolving frame 11 at the front left side of the upper revolving body 10 as shown in FIGS. 1 and 2. The operator gets on and off.

  A driver's seat 42 is provided on the floor board 41, and the driver's seat 42 performs a driving operation in a state where the operator is seated. And on the floor board 41, the canopy 43 which covers the driver's seat 42 from the upper side is provided.

  44 is an exterior cover of the upper revolving unit 10, and the exterior cover 44 is disposed on the revolving frame 11 so as to surround the floor plate 41 from the outside as shown in FIGS. The exterior cover 44 covers the engine in the engine housing space 19 shown in FIGS. 5 and 7 from the outside together with a counterweight 45 described later.

  Reference numeral 45 denotes a counterweight mounted on the rear end side of the revolving frame 11. The counterweight 45 balances the weight of the upper revolving body 10 with respect to a work device 46 described later, and the rear surface side is formed in an arc shape. Has been. The counterweight 45 located on the rear end side of the upper swing body 10 is disposed within the vehicle width between the crawler belts 9 and 9 shown in FIG. The excavator 1 is realized.

  46 is a working device provided at the front portion of the upper swing body 10 so as to be able to move up and down. This working device 46 is composed of, for example, an offset boom type working device, and includes a lower boom 46A, an upper boom 46B, a cylinder stay 46C, an arm 46D, and the like. It is comprised by the bucket 46E etc. The lower boom 46A of the working device 46 is attached so that the base end side can be lifted up and down between the mounting brackets 14A and 15A of the front vertical plates 14 and 15.

  Here, when performing side grooving work or the like using the working device 46, the cylinder stay 46C, the arm 46D, and the bucket 46E are moved left and right by swinging the upper boom 46B left and right with respect to the lower boom 46A. In this state, the side groove digging can be easily performed by the bucket 46E.

  Further, the working device 46 is in a small turning posture by rotating the arm 46D and the bucket 46E so that the lower boom 46A shown in FIG. The entire working device 46 is accommodated within the vehicle width between the crawler belts 9 and 9 shown in FIG. Reference numeral 47 denotes an earth removing plate device provided on the track frame 3 of the lower traveling body 2.

  The hydraulic excavator 1 according to the present embodiment has the above-described configuration. Next, the operation thereof will be described.

  First, when the operator gets on the floor board 41, as shown in FIG. 2 and FIG. 9, using the gap K formed between the left guard member 22 of the turning frame 11 and the crawler belt 9, the shoe tip of the operator, etc. Is placed on the upper surface of the crawler belt 9 and is placed on the floor board 41 as a step. The operator sitting in the driver's seat 42 drives the excavator 1 by starting the engine and appropriately operating the operation lever and the like.

  When the hydraulic excavator 1 (vehicle) travels, the vehicle can be moved forward or backward by rotating the crawler belt 9 with a traveling hydraulic motor or the like of the lower traveling body 2. Further, during excavation work such as earth and sand, a turning hydraulic motor or the like is driven to turn the upper turning body 10 on the lower traveling body 2 to orient the working device 46 in an arbitrary direction, while lowering the lower boom of the working device 46. 46A etc. can be moved upside down to perform excavation work of earth and sand by the bucket 46E.

  By the way, in such a hydraulic excavator 1, the upper and lower gaps K formed between the crawler belt 9 of the lower traveling body 2 and the guard members 22 and 23 of the turning frame 11 are shown in FIG. As shown in FIG. 9, it is made as small as possible (for example, a size that allows an operator's shoetips or the like to enter) so as to enhance the appearance of balance and stability.

  However, in the prior art, the round cylinder (upper and lower dimensions) of the track frame is formed short so that the gap K illustrated in FIGS. 2 and 9 is kept as small as possible. For this reason, the problem that the operation | work which mounts an upper turning body on a lower traveling body via a turning wheel cannot be performed efficiently has arisen.

  Therefore, in the present embodiment, the round cylinder 5 of the lower traveling body 2 is formed longer in the upper and lower directions than the conventional round cylinder, and has a height dimension H as shown in FIGS. Yes. Further, the turning wheel 35 in which the inner ring 36 is installed on the upper surface of the circular cylinder 5 can secure a space S larger than the bolt 40 between the lower surface of the outer ring 38 and the upper surface 4A of the track frame 3 by the circular cylinder 5. I am doing so.

  Further, as shown in FIGS. 9 and 10, the left guard member 22 and the right guard member 23 of the revolving frame 11 have upper surfaces 22A and 23A arranged on substantially the same plane as the upper surface 13A of the bottom plate 13, and their lower surfaces 22B. , 23B are arranged at positions below the lower surface 13B of the bottom plate 13.

  For this reason, even when the inner ring 36 of the turning wheel 35 is fixed to the upper surface of the round cylinder 5 as shown in FIGS. 10 and 11, the outer ring 38 is interposed between the outer ring 38 of the turning wheel 35 and the upper surface 4 A of the track frame 3. The space S for inserting the bolt 40 from the lower side into the bolt insertion hole 38A can be secured, and the fastening operation of the bolt 40 from the lower side of the outer ring 38 can be easily performed.

  Moreover, since the lower surfaces 22B and 23B of the left and right guard members 22 and 23 are disposed at positions below the bottom plate 13 of the revolving frame 11, the crawler belt 9 of the lower traveling body 2 and the guards of the revolving frame 11 are provided. The upper and lower gaps K formed between the members 22 and 23 can be reduced as shown in FIG. 2 and FIG. 9, for example, can be made large enough to fit the operator's shoes. .

  Therefore, according to the present embodiment, by making the gap K in the upper and lower directions small, it is possible to improve the sense of balance and the sense of stability of the upper swing body 10 with respect to the lower traveling body 2. In addition, the work of attaching the bottom plate 13 of the turning frame 11 to the outer ring 38 of the turning wheel 35 using a plurality of bolts 40 as shown in FIG. 10 can be efficiently performed, and the workability during assembly is improved. Can do.

  Further, in the present embodiment, the left guard member 22 and the right guard member 23 are configured by a left bent frame portion 24 and a right bent frame portion 27 that are curved in an arc shape with respect to the turning center O of the turning frame 11. is doing. For this reason, the turning radius when the upper turning body 10 performs the turning operation can be reduced by the left bending frame portion 24 and the right bending frame portion 27 curved in an arc shape. For example, even in a narrow work site such as an urban area, the turning radius can be reduced. The operation can be easily performed.

  Further, the weight plate 21 is additionally provided on the bottom plate 13 of the revolving frame 11 on the lower surface on the rear side. For this reason, the weight and volume of the counterweight 45 provided on the upper side of the turning frame 11 (bottom plate 13) can be reduced by the weight plate 21, and this also reduces the turning radius of the upper turning body 10. be able to.

  Next, FIG. 12 and FIG. 13 show a second embodiment of the present invention. The feature of this embodiment is a small rear turning type in which a swing post type working device is provided at the front part of the upper turning body. This is in adopting the hydraulic excavator. In the present embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and the description thereof is omitted.

  In the figure, reference numeral 51 denotes a rear small swing type hydraulic excavator as a swing type construction machine, and the hydraulic excavator 51 is mounted on the lower traveling body 52 and on the lower traveling body 52 through a swirling wheel 35 so as to be capable of swinging. The upper revolving body 60 described later and a work device 70 described later provided at the front of the upper revolving body 60 are roughly configured.

  The lower traveling body 52 has a track frame 53 in substantially the same manner as the lower traveling body 2 described in the first embodiment, and the track frame 53 includes a track center frame 54 and a left, left, It is composed of right track side frames 55, 55 and the like.

  Further, on the upper surface of the central portion of the track center frame 54, a circular cylinder 56 made of a circular ring is provided by means of welding or the like in substantially the same manner as the track center frame 4 described in the first embodiment. On the upper surface of 56, as in the first embodiment, the swivel wheel 35 is fixed with a bolt or the like. Then, as shown in FIG. 13, the round body 56 is located between the outer ring 38 of the turning wheel 35 and the upper surface 54A of the track center frame 54, rather than the bolt 40 (see FIG. 11) described in the first embodiment. A large space S is secured.

  A pair of left and right crawler belts 57, 57 driven by a traveling hydraulic motor (not shown) or the like is provided on the track side frames 55, 55 located on both the left and right sides of the track frame 53. ing.

  Reference numeral 60 denotes an upper swing body that is turnably mounted on the track frame 53 of the lower traveling body 52 via a swing wheel 35. The upper swing body 60 includes the upper swing body 10 described in the first embodiment. The floor frame 65, the driver's seat 66, the canopy 67, the exterior cover 68, the counterweight 69, etc., which will be described later, are provided on the revolving frame 61 which will be described later.

  Reference numeral 61 denotes a revolving frame constituting a frame of the upper revolving structure 60. The revolving frame 61 is also configured in substantially the same manner as the revolving frame 11 described in the first embodiment, and the left of the revolving main frame (not shown), On both right sides, a left guard member 62 and a right guard member 63 are provided as shown in FIG.

  The left guard member 62 and the right guard member 63 are lower than the bottom plate (not shown) of the turning main frame, like the left guard member 22 and the right guard member 23 described in the first embodiment. The upper and lower gaps K formed between the crawler belt 57 of the lower traveling body 52 and the guard members 62 and 63 of the turning frame 61 are made small as shown in FIG. It is configured to be small enough to fit a shoe tip, etc.).

  However, the revolving frame 61 according to the present embodiment is different from the first embodiment in that a swing bracket 64 for attaching a work device 70 described later is provided on the front side of the revolving main frame. . Then, as shown in FIG. 12, a swing post 70A, which will be described later, is connected to the swing bracket 64 so as to be swingable in the left and right directions.

  Reference numeral 65 denotes a floor board provided on the revolving frame 61. The floor board 65 is configured in substantially the same manner as the floor board 41 described in the first embodiment. Reference numeral 66 denotes a driver seat provided on the floor board 65. The driver seat 66 performs a driving operation in a state where the operator is seated. A canopy 67 is provided on the floor board 65 to cover the driver's seat 66 from above.

  Reference numeral 68 denotes an outer cover of the upper swing body 60, and 69 denotes a counterweight mounted on the rear end side of the swing frame 61. The exterior cover 68 and the counterweight 69 are configured in substantially the same manner as the exterior cover 44 and the counterweight 45 described in the first embodiment.

  Reference numeral 70 denotes a working device provided at the front portion of the upper swing body 60. Unlike the first embodiment, the working device 70 is a swing post type working device. That is, the work device 70 is configured by a swing post 70A, a boom 70B, an arm 70C, a bucket 70D, and the like as shown in FIG.

  The swing post 70A of the work device 70 is attached to the swing bracket 64 of the revolving frame 61 so as to be swingable in the left and right directions, and the base end side of the boom 70B is attached to the swing post 70A so as to be able to move up and down. ing. Further, the proximal end side of the arm 70C is attached to the distal end portion of the boom 70B so as to be able to move up and down, and the bucket 70D is rotatably attached to the distal end side of the arm 70C. Reference numeral 71 denotes an earth removing plate device provided on the track frame 53 of the lower traveling body 52.

  Thus, even in the present embodiment configured as described above, a large space S can be secured between the outer ring 38 of the turning wheel 35 and the upper surface 54A of the track center frame 54, as shown in FIG. It is possible to obtain substantially the same effect as that of the first embodiment.

  In the first embodiment, as an example, the upper surfaces 22A and 23A of the guard members 22 and 23 are arranged on the same plane as the upper surface 13A of the bottom plate 13 as shown in FIG. explained. However, the present invention is not limited to this. For example, the upper surface of the guard member may be arranged at a height position below the upper surface of the bottom plate. This point is the same for the second embodiment.

  Moreover, in the said embodiment, the hydraulic excavators 1 and 51 which comprised the upper side of the driver's seats 42 and 66 with the canopies 43 and 67 were demonstrated as an example. However, the present invention is not limited to this, and may be applied to, for example, a hydraulic excavator having a cab that covers the periphery of the driver's seat.

  Furthermore, the present invention is not limited to a small swing type excavator, and may be applied to, for example, a medium- or large-sized hydraulic excavator, or may be applied to a swing-type construction machine other than the hydraulic excavator.

It is a front view showing a hydraulic excavator provided with an offset boom type working device by a 1st embodiment of the present invention. It is the left view of FIG. 1 which looked at the hydraulic excavator of the state which removed the working apparatus from the front side. It is a front view which shows the turning frame in FIG. 1 alone. FIG. 4 is a plan view of the track frame of FIG. 3 as viewed from above. It is a top view which shows the turning frame in FIG. 1 alone. It is an expanded sectional view which looked at the turning frame from the arrow VI-VI direction in FIG. It is the perspective view which looked at the turning frame in FIG. 5 from diagonally upward. It is the perspective view which looked at the turning frame in FIG. 5 from diagonally downward. It is sectional drawing which shows the state which mounted the turning frame seen from the arrow IX-IX direction in FIG. 5 on the track frame of a lower traveling body. FIG. 10 is a cross-sectional view showing a state before the turning frame in FIG. 9 is mounted on the track frame of the lower traveling body. It is a fragmentary sectional view which expands and shows the principal part in FIG. It is a front view which shows the hydraulic excavator provided with the swing post type working device by 2nd Embodiment. FIG. 13 is a left side view of FIG. 12 when the hydraulic excavator with the work device removed is viewed from the front side.

Explanation of symbols

1,51 Hydraulic excavator (Construction machinery)
2,52 Lower traveling body 3,53 Track frame 4,54 Track center frame 5,56 Round body 6,55 Track side frame 9,57 Track crawler 10,60 Upper revolving body 11,61 Revolving frame 12 Revolving main frame 13 Bottom plate 14 Front left vertical plate (vertical plate)
15 Front right vertical plate (vertical plate)
21 Weight plate 22, 62 Left guard member 23, 63 Right guard member 35 Turning wheel 36 Inner ring 37 Steel ball (roller)
38 Outer ring 38A Bolt insertion hole 40 Bolt (fastening member)
41, 65 Floor plate 42, 66 Driver's seat 43, 67 Canopy 44, 68 Exterior cover 45, 69 Counterweight 46, 70 Working device

Claims (4)

A lower traveling body provided with a circular cylinder on the upper surface of the center portion of the track frame, an inner ring fixed to the circular cylinder of the lower traveling body, and an outer peripheral side of the inner ring are rotatably provided via a plurality of rolling elements. A turning wheel composed of an outer ring, and an upper turning body on which a turning frame is turnably mounted on the lower traveling body via the turning wheel,
A swing frame of the upper swing body includes a bottom plate that is detachably attached to the outer ring of the swing wheel, and a swing main frame that includes a left and right vertical plate that is erected upward from the bottom plate and extends in the front and rear directions, In a swivel construction machine composed of left and right guard members provided on both the left and right sides of the swivel main frame,
The outer ring of the turning wheel and the bottom plate of the turning main frame are configured to be fixed using a plurality of fastening members inserted upward from the lower surface side of the outer ring,
A swivel construction machine characterized in that the guard member has a top surface disposed at a height position that is equal to or less than a bottom plate of the swivel main frame and in a downward direction.   The track frame of the lower traveling body is provided with a track center frame provided with the round cylinder on the upper surface side, and left and right crawler belts extending in the front and rear directions located on both the left and right sides of the track center frame. It is composed of left and right track side frames, and the upper and lower lengths of the round cylinder are formed such that the fastening member can be disposed between the upper surface of the track center frame and the lower surface of the outer ring. The turning construction machine according to claim 1.   The swivel construction machine according to claim 1 or 2, wherein the guard member of the swivel frame has a lower surface disposed at a position below the lower surface of the bottom plate.   4. The swivel construction machine according to claim 1, wherein the bottom plate of the swivel main frame is provided with a weight plate constituting a part of a counterweight on a lower surface on the rear side.

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