JP2006328764A - Turning frame of construction machinery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a turning frame of construction machinery capable of decreasing rolling vibration of a counter weight mounted on the sides of the rear sections of both right and left vertical plates. <P>SOLUTION: An interval W1 between weights mounting sections 23B and 24B located on the sides of the rear sections of both right and left vertical plates 23 and 24 is set wider than an interval F1 between working device mounting sections 23A and 24A located on the sides of the front sections of both right and left vertical plates 23 and 24. Since the right mounting section 23B of the left vertical plate 23 and the weight mounting section 24B of the right vertical plate 24 can be thereby supported by stabilizing the counter weight 7 at a position largely separated from the center line A-A passing along the turning center Po, the rolling vibration of the counter weight 7 can be decreased. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a swivel frame for a construction machine that is suitably used for construction machines such as a hydraulic excavator and a hydraulic crane.

  In general, a construction machine such as a hydraulic excavator or a hydraulic crane has a self-propelled lower traveling body, an upper revolving body mounted on the lower traveling body so as to be able to swivel, and an uplifting movement to the front side of the upper revolving body. It is roughly constituted by a working device that can be provided.

  The upper swing body includes a swing frame that serves as a base, a cab that is provided on the left side of the front portion of the swing frame to define a driver's cab, and an engine, a hydraulic pump, and the like that are provided on the rear side of the cab. The building cover is generally constituted by a covering weight and a counterweight provided on the rear end side of the revolving frame to balance the weight with the work device.

  Here, the revolving frame that is the base of the upper revolving structure is usually a center frame that is mounted on the lower traveling structure via a revolving wheel, and is disposed on both the left and right sides of the center frame so as to be forward and backward. The extending left and right side frames and a plurality of projecting beams connecting the center frame and the left and right side frames constitute a strong support structure.

  Further, the center frame has a bottom plate which is provided with a swivel wheel on the lower surface side and is capable of turning about the turning center, and is provided on the bottom plate so as to face left and right and extend left and right while facing the left and right. And a vertical plate. A working device is attached to the front side of the left and right vertical plates, and a counterweight is attached to the rear side of the left and right vertical plates. Further, a cab support portion is formed between the left vertical plate and the left side frame, and the cab is supported from the lower side by this cab support portion (see, for example, Patent Document 1).

JP-A-6-299574

  By the way, a swivel frame such as a hydraulic excavator has a left vertical plate of a center frame provided with a cab support portion in order to increase the dimension of the cab in the width direction (left and right directions) and improve the comfortability of the operator in the cab. And the left side frame must be as large as possible. For this reason, in the swivel frame according to the prior art, the distance between the swivel center and the left vertical plate is smaller than the distance between the swivel center and the right vertical plate.

  Therefore, when the counterweight is attached to the rear side of the left and right vertical plates, the center of gravity of the counterweight is biased to the left vertical plate side, and the load from the counterweight acting on the rear side of the left vertical plate is It becomes larger than the load from the counterweight acting on the rear side of the right vertical plate.

  As a result, vibrations generated during excavation during traveling of the hydraulic excavator are transmitted to the counterweight via the swing frame, and when the counterweight vibrates due to inertial force, the load acting on the rear side of the left and right vertical plates Due to this difference, the counterweight generates a large vibration (rolling vibration) in the left and right directions.

  As a result, the rolling vibration of the counterweight is transmitted to the entire hydraulic excavator through the turning frame, and the cab is greatly subjected to the rolling vibration, so that the comfortability in the cab and the operability with respect to the operation lever are deteriorated. There is.

  In addition, the vibration is transmitted to the mounted device such as the engine mounted on the swing frame, so that a large load acts on the mounting portion between the mounted device and the swing frame, and the durability of the mounting portion is reduced. There is a problem in that the durability of each mounted device itself is also lowered.

  The present invention has been made in view of the above-described problems of the prior art, and provides a swivel frame capable of reducing rolling vibration of a counterweight attached to the rear side of the left and right vertical plates. It is aimed.

  In order to solve the above-described problems, the present invention provides a bottom plate that can turn around a turning center, and a left and right vertical plate that stands on the bottom plate and extends in the front and rear directions while facing each other in the left and right directions. These left and right vertical plates are applied to a swing frame of a construction machine having a construction in which a work device is attached to the front side and a counterweight is attached to the rear side.

  A feature of the invention of claim 1 is that the left and right vertical plates are arranged on the bottom plate so that the distance between the left and right directions is larger on the rear side than on the front side.

  In the invention of claim 2, the left and right vertical plates are positioned on the front side, the working device mounting portion to which the working device is mounted, the weight mounting portion on the rear side to which the counterweight is mounted, The left and right vertical plates are composed of a middle part extending forward and rearward between the device mounting part and the weight mounting part, with a straight line extending forward and rearward through the center of rotation as the center line. The intermediate part of one of the vertical plates is configured to expand and extend in the left and right directions with respect to the center line.

  According to the invention of claim 3, the left and right vertical plates are positioned on the front side, the working device mounting portion to which the working device is mounted, the weight mounting portion on the rear side to which the counterweight is mounted, The left and right vertical plates are composed of a middle part extending forward and rearward between the device mounting part and the weight mounting part, with a straight line extending forward and rearward through the center of rotation as the center line. The middle part of the structure is configured to extend and extend in the left and right directions across the center line.

  The invention of claim 4 is that the middle part of the left and right vertical plates is configured to expand from one point on the center line at a position different from the turning center.

  The invention of claim 5 is that the middle part of the left and right vertical plates is configured to expand from the turning center.

  According to the first aspect of the present invention, the counterweight can be stably supported with the rear side of the left and right vertical plates being largely separated from the turning center, and rolling vibration of the counterweight can be reduced. it can. Further, since the rear side of the left and right vertical plates can be arranged in a balanced manner with respect to the position of the center of gravity of the counterweight, the load from the counterweight acting on the left and right vertical plates can be equalized. As a result, it is possible to suppress the rear side of the left and right vertical plates from bending upward and downward with different deflection amounts (amplitudes), and to efficiently reduce counterweight rolling vibration.

  Therefore, it is possible to suppress vibration from being transmitted from the counterweight to the turning frame, and to maintain good operability in the cab mounted on the turning frame and the operation lever. In addition, since vibrations can be suppressed from being transmitted to equipment such as an engine mounted on the swing frame, durability of the mounting portion between the swing frame and the mounted equipment and durability of the mounted equipment itself can be improved. .

  According to the second aspect of the present invention, the middle part of one of the left and right vertical plates extends and extends in the left and right directions with respect to the center line, so that the left and right vertical plates The interval between the weight attaching portions can be increased, and the counter weight can be stably supported by the weight attaching portions of the left and right vertical plates.

  According to the third aspect of the present invention, the intermediate portion of the left and right vertical plates extends and extends in the left and right directions across the center line, so that the distance between the weight mounting portions of the left and right vertical plates is increased. The counterweight can be more stably supported by the weight attaching portions of the left and right vertical plates. In addition, the weight mounting portions of the left and right vertical plates can be arranged in a balanced manner with respect to the position of the center of gravity of the counterweight, and the load from the counterweight acting on the left and right vertical plates can be equalized. .

  According to the invention of claim 4, since the middle part of the left and right vertical plates is configured to expand from one point on the center line at a position different from the turning center, the left and right vertical plates are caused by the vibration of the counterweight. The load such as torsional force transmitted to the swivel frame through the plate can be made substantially equal in the left and right directions. Thereby, in addition to reducing the vibration of the counterweight, it is possible to increase the rigidity of the swivel frame against the bending force and torsional force that act on the swivel frame as the counterweight vibrates.

  According to the invention of claim 5, since the middle part of the left and right vertical plates expands from the turning center, the left and right vertical plates are arranged radially from the turning center of the turning frame. Can do. As a result, a load such as a torsional force transmitted to the turning frame through the left and right vertical plates due to the vibration of the counterweight acts substantially equally on the turning center of the turning frame. For this reason, not only the vibration of the counterweight can be reduced, but also the rigidity of the swivel frame can be further increased against the bending force and the torsional force that act on the swivel frame due to the vibration of the counterweight.

  Hereinafter, an embodiment of a swing frame for a construction machine according to the present invention will be described in detail with reference to FIGS. 1 to 10 by taking as an example a case where it is applied to a hydraulic excavator.

  First, FIG. 1 to FIG. 4 show a first embodiment of the present invention. In the figure, reference numeral 1 denotes a hydraulic excavator as a construction machine. The hydraulic excavator 1 is mounted on a self-propelled crawler-type lower traveling body 2 and turnable on the lower traveling body 2 via a swirling wheel 3. The upper revolving body 4 and a work device 8 described later provided on the front side of the upper revolving body 4 are roughly configured.

  Here, the upper swing body 4 is provided on a later-described swing frame 11 serving as a base, a cab 5 that is provided on the left side of the front portion of the swing frame 11 and that defines a driver's cab, and a rear side of the cab 5. The building cover 6 covers a mounting device (not shown) such as an engine mounted on the revolving frame 11 and a counterweight 7 provided on the rear end side of the revolving frame 11.

  Reference numeral 8 denotes a working device provided on the front side of the upper swing body 4. The working device 8 includes a boom 8A rotatably attached to left and right vertical plates 23 and 24, which will be described later, and the boom 8A. An arm 8B rotatably attached to the distal end of the arm 8B, a bucket 8C rotatably attached to the distal end of the arm 8B, and a boom cylinder 8D, an arm cylinder 8E, and a bucket cylinder 8F that drive these. It is configured to perform excavation work of earth and sand.

  Reference numeral 11 denotes a revolving frame that serves as a base of the upper revolving unit 4, and the revolving frame 11 includes a center frame 21, a left side frame 12, a left overhanging beam 13, and a right side frame 16, which will be described later. , A right support beam 17 and the like are formed as a strong support structure.

  Reference numeral 12 denotes a left side frame disposed on the left side of a center frame 21 to be described later. The left side frame 12 is formed by using, for example, a D-shaped frame made of a cylindrical body having a D-shaped cross section, and is Extending in the direction. The left side frame 12 is connected to the center frame 21 via each left extending beam 13 by being fixed to the front ends of a plurality of left extending beams 13 protruding leftward from the center frame 21. .

  A front frame member 14 extending in the left and right directions is fixedly provided between the front end portion of the left side frame 12 and the center frame 21, and the cab is supported by the front frame member 14, the left extension beam 13, and the like. A portion 15 is formed. The cab 5 shown in FIG. 1 is supported on the cab support portion 15 via an anti-vibration mount or the like (not shown).

  Reference numeral 16 denotes a right side frame disposed on the right side of the center frame 21. The right side frame 16 is formed using, for example, a D-shaped frame made of a cylindrical body having a D-shaped cross-sectional shape, and extends in the front and rear directions. It extends. The right side frame 16 is connected to the center frame 21 via each right extending beam 17 by being fixed to the distal ends of a plurality of right extending beams 17 extending rightward from the center frame 21. .

  Reference numeral 18 denotes a rear end plate for connecting the rear end portions of the left and right side frames 12 and 16, and the rear end plate 18 is provided between the rear end portion of the left side frame 12 and the left vertical plate 23. The rear end of the frame 16 and the right vertical plate 24 are connected to each other, and the left vertical plate 23 and the right vertical plate 24 are connected to each other, and extend in the left and right directions.

  Reference numeral 21 denotes a center frame that constitutes the central portion of the revolving frame 11, and the center frame 21 includes a bottom plate 22, a left vertical plate 23, a right vertical plate 24, and the like, which will be described later.

  Reference numeral 22 denotes a bottom plate constituting the center frame 21. The bottom plate 22 is formed in a flat plate shape using a thick steel plate or the like, and is attached on the lower traveling body 2 via the swivel wheel 3 shown in FIG. is there. Here, the position of the bottom plate 22 corresponding to the center of the turning wheel 3 is the turning center Po of the turning frame 11. The bottom plate 22 has a plurality of screw holes 22A arranged in a circle around the turning center Po for attaching the turning wheel 3, a turning motor mounting portion 22B to which a turning motor (not shown) is attached, a boom Left and right boom cylinder attachment portions 22C and 22D to which the cylinder 8D is attached are provided.

  A left vertical plate 23 stands on the upper surface side of the bottom plate 22, and the left vertical plate 23 extends forward and rearward while facing a right vertical plate 24 described later in the left and right directions. Here, the front side of the left vertical plate 23 shown in the range of the length S1 in FIG. 2 is a working device attachment portion 23A to which the proximal end side of the working device 8 shown in FIG. 1 is attached. The work device mounting portion 23A is provided with a boom mounting portion 23A1 to which the base end side of the boom 8A is attached, and a boom cylinder mounting portion 23A2 to which the base end side of the boom cylinder 8D is attached together with the boom cylinder mounting portion 22C of the bottom plate 22. It has been.

  Further, the rear portion side of the left vertical plate 23 shown in the range of the length S2 in FIG. 2 protrudes rearward from the rear end plate 18 and is a weight attachment portion 23B to which the counterweight 7 is attached. Furthermore, a space 23C between the work device attachment portion 23A and the weight attachment portion 23B (range of length S3) is an intermediate portion 23C extending in the front and rear directions.

  Here, as shown in FIG. 2, if a straight line extending forward and backward through the turning center Po is a center line AA, the working device attachment portion 23A and the weight attachment portion 23B of the left vertical plate 23 are: It extends parallel to the center line AA. On the other hand, the intermediate portion 23C of the left vertical plate 23 is expanded so as to be gradually separated leftward from the center line AA toward the rear. In this case, if a virtual line extending along the intermediate portion 23C is L1-L1, the virtual line L1-L1 intersects with a point P1 on the center line AA at a position different from the turning center Po.

  Further, a flat upper flange plate 23D is fixed to the upper end sides of the weight attaching portion 23B and the intermediate portion 23C of the left vertical plate 23 by welding or the like, and an upper flange plate 23D is fixed to the lower end side of the left vertical plate 23. A flat plate-like lower flange plate 23E facing in the upward and downward directions is fixed by welding or the like. As a result, the weight attaching portion 23B of the left vertical plate 23 forms a strong support structure having an I-shaped cross-sectional shape in which the upper flange plate 23D and the lower flange plate 23E are integrated. Further, as shown in FIG. 4 and the like, two hollow cylindrical bodies 23F into which bolts 25 described later are inserted are spaced forward and backward between the upper flange plate 23D and the lower flange plate 23E. Is provided.

  Reference numeral 24 denotes a right vertical plate that is erected on the upper surface side of the bottom plate 22 together with the left vertical plate 23. The right vertical plate 24 linearly faces the left vertical plate 23 in the left and right directions and forward and backward. It extends. Here, the front side of the right vertical plate 24 is a working device mounting portion 24A. The working device mounting portion 24A has a boom mounting portion 24A1 to which the base end side of the boom 8A is mounted and a boom cylinder mounting portion 22D of the bottom plate 22. At the same time, a boom cylinder mounting portion 24A2 to which the base end side of the boom cylinder 8D is mounted is provided. Also, the rear side of the right vertical plate 24 is a weight mounting portion 24B that protrudes rearward from the rear end plate 18 and to which the counterweight 7 is mounted. The space between the work device mounting portion 24A and the weight mounting portion 24B is forward and backward. The intermediate portion 24C extends. The working device attachment portion 24A, the weight attachment portion 24B, and the intermediate portion 24C of the right vertical plate 24 extend in parallel with a center line AA passing through the turning center Po.

  Further, a flat upper flange plate 24D is fixed to the upper ends of the weight attaching portion 24B and the intermediate portion 24C of the right vertical plate 24 by welding or the like, and an upper flange plate 24D is fixed to the lower end side of the right vertical plate 24. A flat lower flange plate (not shown) facing the upper and lower directions is fixed by welding or the like. As a result, the weight attaching portion 24B of the right vertical plate 24, like the left vertical plate 23, has a strong support structure having an I-shaped cross-sectional shape in which the upper flange plate 24D and the lower flange plate are integrated. There is no. Further, between the upper flange plate 24D and the lower flange plate, two hollow cylindrical bodies 24E into which bolts 25 described later are inserted are provided to be separated in the front and rear directions.

  And the base end side of the working device 8 is attached to the working device mounting portions 23A and 24A of the left and right vertical plates 23 and 24, and on the weight mounting portions 23B and 24B of the left and right vertical plates 23 and 24, respectively. Is configured such that the counterweight 7 is attached using bolts 25 inserted through the cylindrical bodies 23F and 24E.

  26, 26,... Are a plurality of engine brackets disposed between the rear sides of the left and right vertical plates 23, 24. Each engine bracket 26 is connected to an engine (not shown) via an engine mount. Can be mounted.

  Here, as shown in FIG. 2, the interval between the working device mounting portion 23A of the left vertical plate 23 and the working device mounting portion 24A of the right vertical plate 24 is F1, and the weight mounting portion 23B of the left vertical plate 23 and the right vertical plate 23 If the distance between the weight 24 of the plate 24 and the weight mounting portion 24B is W1, the distance W1 between the weight mounting portions 23B and 24B is set larger than the distance F1 between the work device mounting portions 23A and 24A (W1> F1).

  As a result, the weight attaching portions 23B and 24B of the left and right vertical plates 23 and 24 can be largely separated from the center line AA passing through the turning center Po, respectively, and the weight attaching portions having this large interval W1. The counterweight 7 can be stably supported by 23B and 24B.

  Further, the distance between the weight attaching portion 23B and the center line AA and the distance between the weight attaching portion 24B and the center line AA are set to the same distance W1 / 2. As a result, the load acting on the weight mounting portion 23B of the left vertical plate 23 from the counterweight 7 and the load acting on the weight mounting portion 24B of the right vertical plate 24 from the counterweight 7 are made uniform, and the left and right weight mountings are made. The portions 23B and 24B are configured to be able to substantially equalize the amount of deflection (amplitude) when the portions 23B and 24B are deflected upward and downward due to the rolling vibration of the counterweight 7.

  Further, by increasing the interval W1 between the left and right weight mounting portions 23B and 24B, an engine or the like (not shown) is arranged between the intermediate portions 23C and 24C of the left and right vertical plates 23 and 24. Large space can be secured. Thus, for example, the engine mounting position can be lowered as compared with the case where the engine is disposed on the upper flange plates 23D, 24D of the left and right vertical plates 23, 24.

  The revolving frame 11 according to the present embodiment has the above-described configuration. The hydraulic excavator 1 provided with the revolving frame 11 self-travels to the work site by the lower traveling body 2 and then revolves the upper revolving body 4. While the working device 8 is moved up and down, earth and sand excavation work and the like are performed.

  Here, when the excavator 1 travels on rough terrain or the like, or when excavation work is performed using the work device 8, the counterweight 7 is left and right with the axis extending in the front and rear directions as the center. A vibration in the direction (rolling vibration) is generated, and this rolling vibration is transmitted from the counterweight 7 to the turning frame 11.

  However, in the present embodiment, the interval W1 between the weight attaching portions 23B, 24B located on the rear side of the left and right vertical plates 23, 24 is set as the interval F1 between the work device attaching portions 23A, 24A located on the front side. It is set larger than. As a result, the weight attaching portions 23B and 24B of the left and right vertical plates 23 and 24 can stably support the counterweight 7 at positions greatly separated from the center line AA passing through the turning center Po. Therefore, the rolling vibration of the counterweight 7 can be reduced.

  Moreover, the distance between the weight attaching portion 23B of the left vertical plate 23 and the center line AA and the distance between the weight attaching portion 24B of the right vertical plate 24 and the center line AA are equal to each other. Since it is set to W1 / 2, the left and right weight mounting portions 23B and 24B can be arranged in a balanced manner with respect to the center of gravity of the counterweight 7, and the counterweight 7 can be placed on the weight mounting portion 23B of the left vertical plate 23. The acting load and the load acting on the weight attaching portion 24B of the right vertical plate 24 from the counterweight 7 can be made substantially equal. As a result, the left and right weight attaching portions 23B and 24B can be bent upward and downward with substantially the same amount of deflection (amplitude) when subjected to the rolling vibration of the counterweight 7, so that the counterweight 7 Rolling vibration can be efficiently reduced.

  Thus, by reducing the rolling vibration of the counterweight 7, it is possible to reduce the rolling vibration of the cab 5 mounted on the revolving frame 11, so that the comfortability in the cab 5 and the operability with respect to the operation lever, etc. are good. Can be kept in. Further, it is possible to suppress vibrations from being transmitted to a mounted device such as an engine mounted on the swivel frame 11, and to enhance the durability of the mounting portion between the mounted device and the swivel frame 11 and the durability of the mounted device itself. Can do.

  Furthermore, since a large space can be secured between the intermediate portions 23C and 24C of the left and right vertical plates 23 and 24, the engine can be arranged in the space. Thereby, compared with the case where an engine is arrange | positioned on the upper flange plates 23D and 24D of the left and right vertical plates 23 and 24, for example, the position of the center of gravity of the engine can be lowered and the vibration of the engine is reduced. be able to.

  Next, FIG. 5 shows a second embodiment of the present invention. The feature of this embodiment is that the middle part of the left and right vertical plates expands from one point on the center line at a position different from the turning center. It is in the structure which opens. 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 31 denotes a revolving frame according to the present embodiment. The revolving frame 31 is substantially the same as the revolving frame 11 according to the first embodiment, and a center frame 41, a left side frame 12, and a left overhanging beam 13 described later. The center frame 41 is different from the center frame 21 according to the first embodiment.

  Reference numeral 41 denotes a center frame that constitutes the central portion of the revolving frame 31. The center frame 41 includes a bottom plate 42, a left vertical plate 43, a right vertical plate 44, and the like, which will be described later.

  Reference numeral 42 denotes a bottom plate constituting the center frame 41. The bottom plate 42 is formed in a flat plate shape using a thick steel plate or the like, and a turning wheel is attached to the lower surface side thereof. A position of the bottom plate 42 corresponding to the center of the turning wheel is a turning center Po of the turning frame 31. Further, the bottom plate 42 is provided with a plurality of screw holes 42A arranged in a circle around the turning center Po, a turning motor attachment portion 42B, and left and right boom cylinder attachment portions 42C and 42D.

  Reference numeral 43 denotes a left vertical plate that is erected on the upper surface side of the bottom plate 42. The left vertical plate 43 extends forward and rearward while facing a right vertical plate 44 described later in the left and right directions. Here, the front side of the left vertical plate 43 shown in the range of the length S1 is a working device mounting portion 43A to which the base end side of the working device is attached. The working device mounting portion 43A includes a boom mounting portion 43A1 and a boom. A cylinder mounting portion 43A2 is provided.

  Further, the rear side of the left vertical plate 43 shown in the range of the length S2 protrudes rearward from the rear end plate 18 and is a weight attachment portion 43B to which the counterweight 7 is attached. Further, a space 43C between the work device attachment portion 43A and the weight attachment portion 43B (range of length S3) is an intermediate portion 43C extending in the front and rear directions.

  Here, if a straight line extending forward and backward through the turning center Po is a center line AA, the working device attachment portion 43A and the weight attachment portion 43B of the left vertical plate 43 are parallel to the center line AA. And extended. On the other hand, the intermediate portion 43C of the left vertical plate 43 is expanded so as to be gradually separated leftward from the center line AA toward the rear. In this case, if a virtual line extending along the intermediate portion 43C is L2-L2, the virtual line L2-L2 intersects with a point P2 on the center line AA at a position different from the turning center Po.

  Further, a flat upper flange plate 43D is fixed to the upper ends of the weight attaching portion 43B and the intermediate portion 43C of the left vertical plate 43, and the upper flange plate 43D and the upper and lower portions are attached to the lower end side of the left vertical plate 43. A flat lower flange plate (not shown) facing in the direction is fixed. As a result, the weight attaching portion 43B of the left vertical plate 43 forms a strong support structure having an I-shaped cross section, and the bolt for attaching the counterweight 7 between the upper flange plate 43D and the lower flange plate. Are provided with two cylindrical bodies 43E.

  44 is a right vertical plate standing on the upper surface side of the bottom plate 42 together with the left vertical plate 43, and the right vertical plate 44 extends forward and rearward while facing the left vertical plate 43. Here, the front side of the right vertical plate 44 shown in the range of the length S1 is a work device mounting portion 44A provided with a boom mounting portion 44A1 and a boom cylinder mounting portion 44A2.

  Further, the rear side of the right vertical plate 44 shown in the range of the length S2 protrudes rearward from the rear end plate 18 to form a weight attachment portion 44B to which the counterweight 7 is attached. Furthermore, a space 44C between the work device attachment portion 44A and the weight attachment portion 44B (the range of the length S3) is an intermediate portion 44C extending in the front and rear directions.

  Here, the working device attachment portion 44A and the weight attachment portion 44B of the right vertical plate 44 extend in parallel with the center line AA. On the other hand, the intermediate portion 44C of the right vertical plate 44 is expanded so as to be gradually separated from the center line AA toward the rear. In this case, if the virtual line extending along the intermediate portion 44C is R2-R2, the virtual line R2-R2 intersects with a point P2 on the center line AA.

  Further, a flat upper flange plate 44D is fixed to the upper end sides of the weight attaching portion 44B and the intermediate portion 44C of the right vertical plate 44, and the upper flange plate 44D and the upper and lower portions are fixed to the lower end side of the right vertical plate 44. A flat lower flange plate (not shown) facing in the direction is fixed. As a result, the weight attaching portion 44B of the right vertical plate 44 constitutes a strong support structure having an I-shaped cross section, and the bolt for attaching the counterweight 7 between the upper flange plate 44D and the lower flange plate. Are provided with two cylindrical bodies 44E.

  As described above, in the turning frame 31 according to the present embodiment, the intermediate portion 43C constituting the left vertical plate 43 and the intermediate portion 44C constituting the right vertical plate 44 are different from the turning center Po. It is configured to expand from the upper point P2 to the left and right.

  The distance W2 between the weight attachment portion 43B of the left vertical plate 43 and the weight attachment portion 44B of the right vertical plate 44 is the interval between the work device attachment portion 43A of the left vertical plate 43 and the work device attachment portion 44A of the right vertical plate 44. It is set larger than F2 (W2> F2).

  Further, the distance between the weight attaching portion 43B of the left vertical plate 43 and the center line AA and the distance between the weight attaching portion 44B of the right vertical plate 44 and the center line AA are equal to each other. W2 / 2 is set.

  The swivel frame 31 according to the present embodiment has the above-described configuration, and in this embodiment as well, the interval W2 between the weight attaching portions 43B and 44B located on the rear side of the left and right vertical plates 43 and 44 is set. By setting the distance larger than the interval F2 between the work device mounting portions 43A and 44A located on the front side, the counterweight 7 can be stably supported, and rolling vibration of the counterweight 7 can be reduced. it can.

  Further, the distance between the weight attaching portion 43B of the left vertical plate 43 and the center line AA and the distance between the weight attaching portion 44B of the right vertical plate 44 and the center line AA are equal to each other. Since W2 / 2 is set, the load acting on the left and right weight mounting portions 43B and 44B from the counterweight 7 can be made substantially uniform, and the rolling vibration of the counterweight 7 can be efficiently reduced.

  Moreover, in the turning frame 31 according to the present embodiment, the intermediate portion 43C constituting the left vertical plate 43 and the intermediate portion 44C constituting the right vertical plate 44 are on a center line AA different from the turning center Po. It expands left and right from one point P2. For this reason, loads such as torsional force transmitted to the revolving frame 31 through the left and right vertical plates 43 and 44 due to the vibration of the counterweight 7 can be made substantially equal in the left and right directions. Thereby, not only the vibration of the counterweight 7 can be reduced, but also the rigidity of the swivel frame 31 can be increased against the bending force and torsional force acting on the swivel frame 31 due to the vibration of the counterweight 7.

  Next, FIG. 6 shows a third embodiment of the present invention. The feature of this embodiment is that the middle part of the left and right vertical plates is configured to expand from the turning center. 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, 51 is a revolving frame according to the present embodiment, and the revolving frame 51 is substantially the same as the revolving frame 11 according to the first embodiment, and will be described later with a center frame 61, a left side frame 12, and a left overhanging beam 13. The center frame 61 is different from the center frame 21 according to the first embodiment, although it includes the right side frame 16 and the right extending beam 17.

  Reference numeral 61 denotes a center frame that constitutes a central portion of the revolving frame 51. The center frame 61 includes a bottom plate 62, a left vertical plate 63, a right vertical plate 64, and the like, which will be described later.

  Reference numeral 62 denotes a bottom plate constituting the center frame 61. The bottom plate 62 is formed in a flat plate shape using a thick steel plate or the like, and a turning wheel is attached to the lower surface side thereof. The position of the bottom plate 62 corresponding to the center of the turning wheel is the turning center Po of the turning frame 51. Further, the bottom plate 62 is provided with a plurality of screw holes 62A arranged in a circle around the turning center Po, a turning motor attachment portion 62B, and left and right boom cylinder attachment portions 62C and 62D.

  Reference numeral 63 denotes a left vertical plate standing on the upper surface side of the bottom plate 62. The left vertical plate 63 extends in the front and rear directions while facing a right vertical plate 64 described later in the left and right directions. The front side of the left vertical plate 63 shown in the range of the length S1 is a working device mounting portion 63A to which the base end side of the working device is attached. The working device mounting portion 63A includes a boom mounting portion 63A1 and a boom cylinder. A mounting portion 63A2 is provided. In addition, the rear side of the left vertical plate 63 shown in the range of the length S2 is a weight attachment portion 63B to which the counterweight 7 is attached, and is between the work device attachment portion 63A and the weight attachment portion 63B (range of the length S3). Is an intermediate portion 63C extending in the front and rear directions.

  Here, assuming that a straight line extending forward and backward through the turning center Po is a center line AA, the work device attachment portion 63A and the weight attachment portion 63B of the left vertical plate 63 are parallel to the center line AA. And extended. On the other hand, the intermediate portion 63C of the left vertical plate 63 is expanded so as to be gradually separated leftward from the center line AA toward the rear. In this case, if an imaginary line extending along the intermediate portion 63C is L3-L3, the imaginary line L3-L3 intersects with the turning center Po.

  Further, an upper flange plate 63D and a lower flange plate (not shown) are fixed to the weight attaching portion 63B and the intermediate portion 63C of the left vertical plate 63 so as to face each other in the upward and downward directions. As a result, the weight attaching portion 63B of the left vertical plate 63 forms a strong support structure having an I-shaped cross section, and the bolt for attaching the counterweight 7 between the upper flange plate 63D and the lower flange plate. Are provided with two cylindrical bodies 63E.

  Reference numeral 64 denotes a right vertical plate standing on the upper surface side of the bottom plate 62 together with the left vertical plate 63. The right vertical plate 64 extends forward and rearward while facing the left vertical plate 63 in the left and right directions. . The front side of the right vertical plate 64 shown in the range of the length S1 is a working device mounting portion 64A to which the base end side of the working device is attached. The working device mounting portion 64A includes a boom mounting portion 64A1 and a boom cylinder. A mounting portion 64A2 is provided. Further, the rear side of the right vertical plate 64 shown in the range of the length S2 is a weight attachment portion 64B to which the counterweight 7 is attached, and is between the work device attachment portion 64A and the weight attachment portion 64B (range of the length S3). Is an intermediate portion 64C extending in the front and rear directions.

  Here, the working device attachment portion 64A and the weight attachment portion 64B of the right vertical plate 64 extend in parallel with the center line AA. On the other hand, the intermediate part 64C of the right vertical plate 64 is expanded so as to be gradually separated from the center line AA toward the rear. In this case, if the virtual line extending along the intermediate portion 64C is R3-R3, the virtual line R3-R3 intersects the turning center Po.

  Further, an upper flange plate 64D and a lower flange plate (not shown) are fixed to the weight attaching portion 64B and the intermediate portion 64C of the right vertical plate 64 so as to face each other in the upward and downward directions. As a result, the weight attaching portion 64B of the right vertical plate 64 forms a strong support structure having an I-shaped cross section, and the bolt for attaching the counterweight 7 between the upper flange plate 64D and the lower flange plate. Are provided with two cylindrical bodies 64E.

  Thus, in the turning frame 51 according to the present embodiment, the intermediate portion 63C constituting the left vertical plate 63 and the intermediate portion 64C constituting the right vertical plate 64 expand in the left and right directions from the turning center Po. It is the composition to do.

  The distance W3 between the weight attachment portion 63B of the left vertical plate 63 and the weight attachment portion 64B of the right vertical plate 64 is the interval between the work device attachment portion 63A of the left vertical plate 63 and the work device attachment portion 64A of the right vertical plate 64. It is set larger than F3 (W3> F3).

  Further, the distance between the weight attaching portion 63B of the left vertical plate 63 and the center line AA and the distance between the weight attaching portion 64B of the right vertical plate 64 and the center line AA are equal to each other. W3 / 2 is set.

  The revolving frame 51 according to the present embodiment has the above-described configuration. In this embodiment, the interval W3 between the weight attaching portions 63B and 64B located on the rear side of the left and right vertical plates 63 and 64 is also set. By setting the distance larger than the interval F3 between the work device mounting portions 63A and 64A located on the front side, the counterweight 7 can be stably supported, and the rolling vibration of the counterweight 7 can be reduced. it can.

  Further, the distance between the weight attaching portion 63B of the left vertical plate 63 and the center line AA and the distance between the weight attaching portion 64B of the right vertical plate 64 and the center line AA are equal to each other. Since W3 / 2 is set, the load acting on the left and right weight mounting portions 63B and 64B from the counterweight 7 can be made substantially uniform, and the rolling vibration of the counterweight 7 can be efficiently reduced.

  In addition, the revolving frame 51 according to the present embodiment is configured such that the intermediate portion 63C of the left vertical plate 63 and the intermediate portion 64C of the right vertical plate 64 extend from the revolving center Po and extend left and right. The vertical plates 63 and 64 can be arranged radially from the turning center Po of the turning frame 51. For this reason, a load such as a torsional force transmitted to the turning frame 51 through the left and right vertical plates 63 and 64 due to the vibration of the counterweight 7 acts almost uniformly on the turning center Po of the turning frame 51. For this reason, not only the vibration of the counterweight 7 can be reduced, but also the rigidity of the swivel frame 51 can be further increased against the bending force and torsional force that act on the swivel frame 51 as the counterweight 7 vibrates.

  In the above-described first embodiment, the case where the weight attaching portion 23B of the left vertical plate 23 is configured to extend in parallel with the center line AA passing through the turning center Po is illustrated. However, the present invention is not limited to this. For example, as in the first modification shown in FIG. 7, the weight mounting portion 23 </ b> B ′ may be configured to expand and extend with respect to the center line AA.

  In the first embodiment described above, the counterweight 7 is placed on the weight attaching portions 23B and 24B of the left and right vertical plates 23 and 24, and the bolts 25 are inserted through the cylindrical bodies 23F and 24E. The structure which fixes the counterweight 7 is illustrated. However, the present invention is not limited to this. For example, as in the second modification shown in FIGS. 8 and 9, the weight attachment plate is thick at the rear end portions of the left and right weight attachment portions 23B and 24B. 27 may be fixedly provided, and the counterweight 7 may be attached to the rear surface of the weight mounting plate 27 using bolts 25. The same applies to the second and third embodiments.

  Moreover, in 1st Embodiment mentioned above, the case where the intermediate part 23C of the left vertical board 23 expands from one point P1 on centerline AA different from turning center Po is illustrated. However, the present invention is not limited to this. For example, as in the third modification shown in FIG. 10, the intermediate portion 23C ′ of the left vertical plate 23 expands from the turning center Po, that is, the intermediate portion 23C. An imaginary line L1'-L1 'extending along' may intersect with the turning center Po.

  Furthermore, in each embodiment mentioned above, the crawler type hydraulic excavator is illustrated as a construction machine. However, the present invention is not limited to this, and can be widely applied to, for example, construction machines including an upper rotating body such as a wheel-type hydraulic excavator and a hydraulic crane.

It is a front view which shows the hydraulic excavator provided with the turning frame by 1st Embodiment. It is a top view which shows the turning frame by 1st Embodiment alone. FIG. 3 is a cross-sectional view of a bottom plate, a left vertical plate, and the like when viewed from the direction of arrows III-III in FIG. 2. It is sectional drawing of a partially broken state which shows the state which attached the counterweight to the weight attachment part of the vertical board. It is a top view which shows the turning frame by 2nd Embodiment independently. It is a top view which shows the turning frame by 3rd Embodiment alone. It is a top view similar to FIG. 2 which shows the 1st modification of a turning frame. It is a top view similar to FIG. 2 which shows the 2nd modification of a turning frame. It is sectional drawing similar to FIG. 4 which shows the state which attached the counterweight to the weight attachment plate in FIG. It is a top view similar to FIG. 2 which shows the 3rd modification of a turning frame.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hydraulic excavator 7 Counterweight 8 Work apparatus 11, 31, 51 Turning frame 12 Left side frame 16 Right side frame 21, 41, 61 Center frame 22, 42, 62 Bottom plate 23, 43, 63 Left vertical plate 23A, 24A, 43A , 44A, 63A, 64A Work device mounting part 23B, 24B, 43B, 44B, 63B, 64B, 23B 'Weight mounting part 23C, 24C, 43C, 44C, 63C, 64C, 23C' Intermediate part 24, 44, 64 Right vertical Plate Po Rotation center AA Center line

Claims (5)

A bottom plate that can turn around a turning center, and left and right vertical plates that are erected on the bottom plate and face forward and backward while facing each other in the left and right directions. In the turning frame of the construction machine, the plate is configured so that the working device is attached to the front side and the counterweight is attached to the rear side.
A swing frame for a construction machine, wherein the left and right vertical plates are arranged on the bottom plate so that the distance between the left and right directions is larger on the rear side than on the front side. The left and right vertical plates are located on the front side, the working device mounting portion to which the working device is mounted, the weight mounting portion on the rear side to which the counterweight is mounted, and the working device mounting portion And an intermediate part extending in the front and rear directions between the weight and the weight mounting part.
When a straight line extending forward and backward through the turning center is used as a center line, an intermediate portion of one vertical plate of the left and right vertical plates expands left and right with respect to the center line. The turning frame of the construction machine according to claim 1, wherein the turning frame is configured to extend as described above. The left and right vertical plates are located on the front side, the working device mounting portion to which the working device is mounted, the weight mounting portion on the rear side to which the counterweight is mounted, and the working device mounting portion And an intermediate part extending in the front and rear directions between the weight and the weight mounting part.
When a straight line extending forward and backward through the turning center is a center line, an intermediate portion of the left and right vertical plates extends and extends left and right across the center line The turning frame for a construction machine according to claim 1.   4. The turning frame for a construction machine according to claim 2, wherein an intermediate portion of the left and right vertical plates is configured to expand from one point on the center line at a position different from the turning center. 5.   The turning frame for a construction machine according to claim 2 or 3, wherein an intermediate part of the left and right vertical plates is configured to expand from the turning center.

Images