JP4740290B2 - Construction machinery - Google Patents

Construction machinery Download PDF

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Publication number
JP4740290B2
JP4740290B2 JP2008168684A JP2008168684A JP4740290B2 JP 4740290 B2 JP4740290 B2 JP 4740290B2 JP 2008168684 A JP2008168684 A JP 2008168684A JP 2008168684 A JP2008168684 A JP 2008168684A JP 4740290 B2 JP4740290 B2 JP 4740290B2
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Prior art keywords
beam
frame
left
side
cab support
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JP2008168684A
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JP2010007368A (en
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敬弘 小林
秀文 平松
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日立建機株式会社
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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02FDREDGING; SOIL-SHIFTING
    • E02F9/00Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/08Superstructures; Supports for superstructures
    • E02F9/0808Improving mounting or assembling, e.g. frame elements, disposition of all the components on the superstructures
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02FDREDGING; SOIL-SHIFTING
    • E02F9/00Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/16Cabins, platforms, or the like, for drivers
    • E02F9/166Cabins, platforms, or the like, for drivers movable, tiltable or pivoting, e.g. movable seats, dampening arrangements of cabins
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60YINDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2200/00Type of vehicle
    • B60Y2200/40Special vehicles
    • B60Y2200/41Construction vehicles, e.g. graders, excavators
    • B60Y2200/412Excavators
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B62LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62DMOTOR VEHICLES; TRAILERS
    • B62D21/00Understructures, i.e. chassis frame on which a vehicle body may be mounted
    • B62D21/18Understructures, i.e. chassis frame on which a vehicle body may be mounted characterised by the vehicle type and not provided for in groups B62D21/02 - B62D21/17
    • B62D21/186Understructures, i.e. chassis frame on which a vehicle body may be mounted characterised by the vehicle type and not provided for in groups B62D21/02 - B62D21/17 for building site vehicles or multi-purpose tractors
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02FDREDGING; SOIL-SHIFTING
    • E02F3/00Dredgers; Soil-shifting machines
    • E02F3/04Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/28Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
    • E02F3/36Component parts

Description

  The present invention relates to a construction machine such as a hydraulic excavator, and more particularly to a construction machine provided with a cab on a body frame.

  Generally, a hydraulic excavator as a construction machine includes a self-propelled lower traveling body, an upper revolving body that is turnably mounted on the lower traveling body, and a working device provided on the front side of the upper revolving body. And is roughly composed. The upper swing body has a vehicle body frame (swivel frame) serving as a base, and a working device is provided on the front side of the swivel frame so as to be able to move up and down. Counterweight is provided to balance the weight. Further, a cab that defines a cab is provided on the left side of the front part of the swivel frame, and a building cover that accommodates a prime mover and the like is provided on the rear side of the cab.

  A pivot frame according to the prior art has a center frame composed of a bottom plate and left and right vertical plates standing on the bottom plate, and is positioned on both the left and right sides of the center frame and extends in the front and rear directions. Left and right beams and left and right, which are provided between the left and right side frames and the center frame and the left and right side frames, respectively, and join the left and right side frames to the center frame. A cab support frame that connects between the front end side of the side frame located on one side of the direction and the center frame, and the cab includes a cab support beam and a cab located on the rear side of the cab support frame among the beams. It is the structure supported by the support frame.

  Here, among the beams constituting the revolving frame, the cab support beam is usually formed by using a box structure having a closed cross-sectional structure with a quadrangular cross-sectional shape. Thus, by using the cab support beam formed of a box structure having a closed cross-sectional structure, it is possible to stably support a cab having a large weight, and torsional force is applied to the swivel frame by the load of the counterweight or the like. When it acts, it becomes the structure which can ensure sufficient intensity | strength with respect to the said torsional force.

  By the way, since a hydraulic machine such as a prime mover such as an engine and a hydraulic pump driven by the engine is mounted on the swing frame of the hydraulic excavator, noise (from the engine and hydraulic equipment ( Noise) and vibration.

  In this case, since the swivel frame according to the prior art forms the cab support beam with a box structure having a closed cross-sectional structure, noise generated during the operation of the hydraulic excavator resonates inside the cab support beam (air column resonance). ) And the increased noise is transmitted to the cab.

  On the other hand, by providing a partition member inside the cab support beam formed by the box structure, noise generated during the operation of the hydraulic excavator is prevented from resonating inside the cab support beam, and noise transmitted to the cab. There has been proposed a swivel frame that can reduce (see, for example, Patent Documents 1 and 2).

JP 2001-323511 A JP 2003-82705 A

  However, the above-described swivel frame according to the prior art has a structure in which a plurality of partition members are fixed to the inside of the cab support beam formed of the box structure by means of welding or the like. However, there is a problem that workability when assembling the revolving frame is lowered.

  Moreover, even if the inside of the cab support beam is divided into a plurality of closed spaces by the partition member, among the noises having different frequencies depending on the rotational speed of the engine or the like, there is a frequency that resonates inside the divided closed space. Since the noise cannot be reduced, there is a problem that the noise transmitted to the cab cannot always be sufficiently reduced.

  On the other hand, as a swivel frame according to another prior art, a frame including a beam having a U-shaped cross section has been proposed. The beam having the U-shaped cross-sectional shape includes a lower horizontal beam extending in the left and right directions, an upper horizontal beam extending in the left and right directions facing the lower horizontal beam in the upper and lower directions, and a lower horizontal beam, The front horizontal beam is connected to the upper horizontal beam on the front side in the front and rear directions, and the lower horizontal beam and the front side in the rear direction and the rear side in the rear direction (counterweight side) are openings. As described above, when a beam having a U-shaped cross section is used as a cab support beam, noise generated during the operation of the hydraulic excavator does not resonate inside the beam. Can be sufficiently reduced (see, for example, Patent Document 3).

JP 2002-302065 A

  However, the swivel frame according to Patent Document 3 is arranged such that the opening portion of the beam having a U-shaped cross-sectional shape opens toward the rear side. Therefore, when this beam is used as a cab support beam, only the both ends of the lower horizontal beam and the upper horizontal beam are joined to the center frame and the side frame on the rear side of the cab support beam (the side close to the counterweight). Will be.

  As a result, when the center frame / side frame and the cab support beam cannot be sufficiently joined, the center frame / side frame and the cab can be secured when a twisting force is applied to the swivel frame due to the load of the counterweight. There is a problem that partial stress concentration is likely to occur at the joint portion with the support beam, and the joint strength of the cab support beam with respect to torsional force is reduced.

  The present invention has been made in view of the above-described problems of the prior art, and is a construction machine that can reduce noise transmitted to the cab and can increase the bonding strength of the beam to the center frame and the side frame. It is intended to provide.

  In order to solve the above-described problems, the present invention provides a vehicle body frame, a work device provided on the front side of the vehicle body frame, and a counterweight provided on the rear side of the vehicle body frame to balance the weight of the work device. And a cab located on one side of the left and right sides with the work device in between, and provided on the front side of the body frame, the body frame being a left plate standing on the bottom plate and the bottom plate , A center frame composed of a right vertical plate, left and right side frames disposed on both left and right sides of the center frame and extending in the front and rear directions, and the center frame and the left and right sides. A left beam and a right beam which are respectively provided between the frame and which join the left and right side frames to the center frame, a front end side of the side frame located on one side of the left and right directions, and the center frame. A cab support frame that connects between the cab support frame, and the cab is supported by the cab support beam positioned behind the cab support frame and the cab support frame among the beams. Applied to the machine.

The feature of the configuration adopted by the invention of claim 1 is that the cab support beam and the intermediate beam positioned between the cab support frame and the cab support beam are: a lower horizontal beam extending in the left and right directions; An upper horizontal beam facing the lower horizontal beam in the upper and lower directions and extending left and right; a rear vertical beam connecting the lower horizontal beam and the upper horizontal beam on the rear side in the front and rear directions; and the lower horizontal beam; The cross-sectional shape is formed in a U-shape by an opening that opens to the front side in the front and rear direction of the upper horizontal beam, and one end side of the cab support beam and the intermediate beam is located on one side in the left and right directions The other end is joined to the vertical plate and the bottom plate of the center frame .

According to a second aspect of the present invention, a reinforcing member fixed to the lower horizontal beam, the upper horizontal beam, and the rear vertical beam is provided in the cab support beam at intervals in the left and right directions.

  According to the first aspect of the present invention, the cab supporting beam for supporting the cab has a U-shaped cross section by the lower horizontal beam, the upper horizontal beam, and the rear vertical beam connecting the upper and lower horizontal beams at the rear side. Since it is formed, a closed space is not formed inside the cab support beam. As a result, noise generated during operation of the construction machine can be suppressed from increasing in resonance within the cab support beam, reducing noise transmitted to the cab and improving ride comfort within the cab. Can be made.

  On the other hand, the cab support beam is connected to the front side of the lower horizontal beam and the upper horizontal beam by the rear vertical beam, and the front side of the lower horizontal beam and the upper horizontal beam is an opening, so on the front side of the cab support beam, Both ends of the upper and lower horizontal beams are joined to the center frame and the side frame. On the rear side of the cab support beam, both ends of the upper and lower horizontal beams are connected to the center frame and the side frame. To be joined. For this reason, when it sees about the junction part of the cab support beam with respect to a center frame and a side frame, compared with the front part side of a cab support beam, the junction length in the rear part side of a cab support beam can be made larger. As a result, for example, when a counterweight is attached to the rear side of the swivel frame, even if left and right torsional forces act on the swivel frame due to the load of the counterweight, the center frame, the side frame, and the cab support beam It is possible to suppress the occurrence of partial stress concentration at the joint portion between the cab and the cab supporting beam to the center frame and the side frame.

Moreover, an intermediate formed between the cab support frame and the cab support beam with a U-shaped cross section by the lower horizontal beam, the upper horizontal beam, and the rear vertical beam connecting the upper and lower horizontal beams at the rear side. Since the beam is provided, the strength against the torsional force can be further increased even if the counterweight load causes a left and right torsional force to act on the revolving frame. Further, since a closed space is not formed inside the intermediate beam, it is possible to suppress the noise generated during the operation of the construction machine from resonating and increasing inside the intermediate beam.

According to the invention of claim 2 , the strength of the cab support beam itself can be increased by providing the reinforcing member fixed to the lower horizontal beam, the upper horizontal beam, and the rear vertical beam inside the cab support beam. The rigidity of the entire revolving frame in which the center frame and the side frame are joined via the support beam can be increased.

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

  First, FIG. 1 to FIG. 5 show a first embodiment of the present invention, in which 1 denotes a hydraulic excavator that is a typical example of a construction machine. The vehicle body of the hydraulic excavator 1 is roughly composed of a self-propelled crawler-type lower traveling body 2 and an upper revolving body 3 that is turnably mounted on the lower traveling body 2. On the front side, a working device 4 that performs excavation work such as earth and sand is provided so as to be able to move up and down.

  Here, the upper swing body 3 includes a later-described swing frame 11 as a vehicle body frame, a counterweight 5 provided on the rear end side of the swing frame 11 to balance the weight with the work device 4, and a front side of the counterweight 5. And a cab 7 which is disposed on the left side of the front portion of the swivel frame 11 and defines a driver's cab. The building cover 6 accommodates an engine, a hydraulic pump, etc. (all not shown). .

  Further, the working device 4 includes a boom 4A whose base end is rotatably attached to a turning frame 11 described later, an arm 4B rotatably attached to the distal end of the boom 4A, and a tip of the arm 4B. A bucket 4C that is pivotably attached to the side, a boom cylinder 4D composed of a hydraulic cylinder, an arm cylinder 4E, and a bucket cylinder 4F are roughly configured.

  Reference numeral 11 denotes a turning frame as a vehicle body frame. The turning frame 11 is a base of the upper turning body 3. 2 to 4, the revolving frame 11 includes a center frame 12, left and right side frames 18, 19, a cab support frame 20, a cab support beam 23, an intermediate beam 24, and right extension. It is composed of beams 26, 27, 28, 29, etc., and forms a strong support structure.

  Reference numeral 12 denotes a center frame that constitutes the central portion of the swivel frame 11. The center frame 12 includes a bottom plate 13 formed in a flat plate shape using a thick steel plate and the like, and means such as welding on the upper surface side of the bottom plate 13 And left and right vertical plates 14 and 15 extending in the front and rear directions while maintaining a constant interval in the left and right directions.

  Here, the front portions of the left vertical plate 14 and the right vertical plate 15 are boom bracket portions 14A and 15A raised in a mountain shape, respectively. The left and right boom bracket portions 14A and 15A are shown in FIG. The base end side of the boom 4A of the working device 4 is configured to be pin-coupled so as to be rotatable. Further, the front end portions of the left vertical plate 14 and the right vertical plate 15 are cylinder bracket portions 14B and 15B positioned in front of the boom bracket portions 14A and 15A, respectively. The left and right cylinder bracket portions 14B and 15B 1 is configured such that the bottom side of the boom cylinder 4D shown in FIG.

  On the other hand, the rear side of the left vertical plate 14 and the right vertical plate 15 each have an I-shaped cross section (I flange structure) and extend rearward from the boom bracket portions 14A, 15A, and the rear end side is a weight mounting portion 14C, 15C. A counterweight 5 shown in FIG. 1 is attached to the left and right weight attaching portions 14C and 15C using bolts or the like (not shown). Further, between the left vertical plate 14 and the right vertical plate 15, there are provided front and rear connecting plates 16 and 17 that are spaced apart in the front and rear directions and extend in the left and right directions. The rear side of the left and right vertical plates 14 and 15 are connected by the rear connection plates 16 and 17.

  Reference numeral 18 denotes a left side frame disposed on one side (left side) in the left and right directions with the center frame 12 interposed therebetween, and 19 is disposed on the other side (right side) in the left and right directions with the center frame 12 interposed therebetween. The right side frame is shown. Here, the left side frame 18 and the right side frame 19 are formed using, for example, a D-shaped frame made of a cylindrical body having a D-shaped cross section, and extend forward and rearward along the center frame 12.

  The left side frame 18 is attached to the left side of the center frame 12 via a cab support frame 20, a cab support beam 23, an intermediate beam 24, a left rear plate 25, and the like, which will be described later. It is attached to the right side of the center frame 12 via the right extension beams 26, 27, 28, 29, the right rear plate 30, and the like.

  Reference numeral 20 denotes a cab support frame that connects between the front end side of the left side frame 18 and the center frame 12, and the cab support frame 20 supports the cab 7 shown in FIG. To do. Here, the cab support frame 20 is joined to the bottom plate 13 of the center frame 12 and an intermediate beam 24 described later by welding, and is a rectangular tube-shaped vertical frame extending in the front and rear directions in parallel with the left vertical plate 14. The member 21 and the horizontal frame member 22 joined to the front end portion of the vertical frame member 21 and the front end portion of the left side frame 18 by welding and extending in the left and right directions are formed in a substantially L shape. .

  In this case, as shown in FIG. 5 and the like, the horizontal frame member 22 faces the lower horizontal plate 22A extending in the left and right directions, and faces the lower horizontal plate 22A in the upper and lower directions and extends in the left and right directions. The upper horizontal plate 22B, the lower horizontal plate 22A and the front end side of the upper horizontal plate 22B are connected, and the inclined plate extends leftward and rightward while tilting obliquely upward from the lower horizontal plate 22A toward the upper horizontal plate 22B. 22C. Further, mount attachment holes 22D and 22D are provided at both ends in the length direction (left and right directions) of the upper horizontal plate 22B, and the front side of the cab 7 is elastically provided in these mount attachment holes 22D. A mounting member (not shown) to be supported is attached.

  Reference numeral 23 denotes a cab support beam which is located behind the cab support frame 20 and is provided between the left vertical plate 14 and the left side frame 18 of the center frame 12, and the cab support beam 23 is an intermediate beam which will be described later. The left side frame 18 is joined to the center frame 12 together with 24 and the like. The cab support beam 23 supports the cab 7 together with the cab support frame 20 from below.

  Here, the cab support beam 23 is formed, for example, by bending a steel plate, and faces the lower horizontal beam 23A extending in the left and right directions, and the lower horizontal beam 23A with a certain distance in the upper and lower directions. The upper horizontal beam 23B extending in the left and right directions, the lower horizontal beam 23A and the upper horizontal beam 23B are connected at the rear side in the front and rear directions, the rear vertical beam 23C extending in the left and right directions, and the lower horizontal beam 23A It is formed with a U-shaped cross-sectional shape by an opening 23D opened over the entire region in the length direction on the front side in the front and rear direction with respect to the upper horizontal beam 23B.

  The cab support beam 23 is disposed between the left vertical plate 14 and the left side frame 18 with the opening 23D facing the cab support frame 20, as shown in FIG. One end side in the left and right directions is joined to the left side frame 18 by welding, and the other end side in the left and right directions of the cab support beam 23 is joined to the left vertical plate 14 and the bottom plate 13 by welding. Further, mount attachment holes 23E and 23E are provided at both ends in the length direction of the upper transverse beam 23B constituting the cab support beam 23, and the rear side of the cab 7 is elastically supported by these mount attachment holes 23E. A mounting member (not shown) is attached.

  Thus, the cab support beam 23 that supports the rear side of the cab 7 is formed in a U-shaped cross section by the lower horizontal beam 23A, the upper horizontal beam 23B, the rear vertical beam 23C, and the opening 23D. Even if the engine or the like generates noise during the operation of the hydraulic excavator 1, the inside does not form a closed space, and this noise is suppressed from increasing due to resonance (air column resonance) inside the cab support beam 23. It has a structure that can.

  In addition, by arranging the opening 23D of the cab support beam 23 so as to open to the front side toward the cab support frame 20, both end portions of the lower horizontal beam 23A and the upper horizontal beam 23B are formed on the front side of the cab support beam 23. Are joined to the left vertical plate 14 and the left side frame 18, and on the rear side of the cab support beam 23 close to the counterweight 5, in addition to both ends of the lower horizontal beam 23A and the upper horizontal beam 23B, both ends of the rear vertical beam 23C are left It is configured to be joined to the vertical plate 14 and the left side frame 18.

  For this reason, regarding the joining length of the cab support beam 23 to the left vertical plate 14 and the left side frame 18, the rear side of the cab support beam 23 closer to the counterweight 5 than the front side of the cab support beam 23. When the left and right torsional forces are applied to the revolving frame 11 by the load of the counterweight 5, the joining length at the rear vertical beam 23C can be increased. 18 and the cab support beam 23 can be configured to suppress partial stress concentration.

  Reference numeral 24 denotes an intermediate beam located between the cab support frame 20 and the cab support beam 23 and provided between the left vertical plate 14 and the left side frame 18 of the center frame 12, and the intermediate beam 24 is used to support the cab. The left side frame 18 is joined to the center frame 12 together with the beam 23 and the like.

  Here, like the cab support beam 23, the intermediate beam 24 is formed, for example, by bending a steel plate material, and extends to the left and right, a lower horizontal beam 24A, and the lower horizontal beam 24A. An upper horizontal beam 24B facing left and right and facing each other at a certain interval in the direction, and a rear vertical beam extending left and right by connecting the lower and upper horizontal beams 24A and 24B at the rear side in the front and rear directions. 24C and the opening part 24D opened over the whole area of the length direction on the front side of the lower horizontal beam 24A and the upper horizontal beam 24B in the front and rear direction, and having a U-shaped cross section.

  The intermediate beam 24 is disposed between the left vertical plate 14 and the left side frame 18 with the opening 24D facing the cab support frame 20, and one end side in the left and right directions of the intermediate beam 24 is the left side. The other end side of the intermediate beam 24 in the left and right directions is joined to the left vertical plate 14 and the bottom plate 13 by welding. Further, the rear end portion of the vertical frame member 21 constituting the cab support frame 20 is joined to the front end side of the intermediate beam 24 by welding.

  Thus, by forming the intermediate beam 24 in a U-shaped cross section by the lower horizontal beam 24A, the upper horizontal beam 24B, the rear vertical beam 24C and the opening 24D, the inside of the intermediate beam 24 does not form a closed space, Similar to the cab support beam 23, the structure is such that noise can be suppressed from increasing in resonance within the intermediate beam 24.

  Further, by arranging the opening 24D of the intermediate beam 24 so as to open to the front side toward the cab support frame 20, on the rear side of the intermediate beam 24 close to the counterweight 5, both ends of the lower horizontal beam 24A and the upper horizontal beam 24B are disposed. Since both ends of the rear vertical beam 24 </ b> C are joined to the left vertical plate 14 and the left side frame 18 in addition to the portion, the intermediate beam is compared with the front side of the intermediate beam 24 like the cab support beam 23. In this configuration, the joining length on the rear side of 24 can be further increased.

  A left rear plate 25 is provided between the left vertical plate 14 of the center frame 12 and the rear end side of the left side frame 18, and the left rear plate 25 is a flat plate extending in the left and right directions using a steel plate or the like. It is formed in a shape. The left rear plate 25 connects the left vertical plate 14 and the rear end side of the left side frame 18.

  Reference numerals 26, 27, 28, and 29 denote a plurality of right extending beams provided between the right vertical plate 15 and the right side frame 19 of the center frame 12. The right side frame 19 is joined to the frame 12. Each of the right extending beams 26, 27, 28, 29 is formed, for example, by bending a steel plate material, and the right vertical plate 15 and the right side frame 19 of the center frame 12 are provided at both ends in the left and right directions. And joined by welding.

  Reference numeral 30 denotes a right rear plate provided between the right vertical plate 15 of the center frame 12 and the rear end side of the right side frame 19, and the right rear plate 30 is a flat plate extending left and right using a steel plate or the like. It is formed in a shape. The right rear plate 30 connects the right vertical plate 15 and the rear end side of the right side frame 19.

  The hydraulic excavator 1 according to the first embodiment has the turning frame 11 as described above, and the hydraulic excavator 1 provided with the turning frame 11 performs excavation work and the like by being self-propelled by the lower traveling body 2. Move to the work place. And the excavation work of earth and sand etc. can be performed by rotating the boom 4A, the arm 4B, and the bucket 4C of the working device 4 while turning the upper turning body 3.

  Here, when the hydraulic excavator 1 is operated, an engine, a hydraulic pump, and the like (none of which are shown) housed in the building cover 6 generate noise (operating sound) and vibration. To the cab 7.

  In this case, the swivel frame 11 according to the present embodiment has a cab support beam 23 provided on the lower side of the cab 7 having a U-shaped cross section formed by a lower horizontal beam 23A, an upper horizontal beam 23B, a rear vertical beam 23C, and an opening 23D. The intermediate beam 24, which is also formed on the lower side of the cab 7, is formed in a U-shaped cross section by a lower horizontal beam 24A, an upper horizontal beam 24B, a rear vertical beam 24C, and an opening 24D.

  Therefore, a closed space is not formed inside the cab support beam 23 and the intermediate beam 24, and noise generated from the engine or the like is caused by resonance (air column resonance) inside the cab support beam 23 and the intermediate beam 24. The increase can be suppressed. As a result, noise transmitted to the cab 7 when the hydraulic excavator 1 is operated can be reduced, and the riding comfort in the cab 7 can be improved.

  Further, since the cab support beam 23 is arranged so that the opening 23D opens toward the cab support frame 20, the lower side beam 23A and the upper side beam are arranged on the rear side of the cab support beam 23 close to the counterweight 5. In addition to both ends of 23B, both ends of the rear longitudinal beam 23C can be joined to the left vertical plate 14 and the left side frame 18. Accordingly, when the joint portion of the cab support beam 23 to the left vertical plate 14 and the left side frame 18 is seen, the joint on the rear side of the cab support beam 23 close to the counterweight 5 as compared with the front portion side of the cab support beam 23. The length can be increased by the amount of the rear vertical plate 23C. For this reason, even if a left and right torsional force acts on the revolving frame 11 due to the load of the counterweight 5, a partial stress is applied to the joint between the left vertical plate 14 and the left side frame 18 and the cab support beam 23. Concentration can be prevented from occurring. As a result, since the joining strength of the cab support beam 23 to the left vertical plate 14 and the left side frame 18 of the center frame 12 can be increased, the rigidity of the entire revolving frame 11 can be increased.

  Also, since the opening 24D of the intermediate beam 24 is arranged so that the front side opens toward the cab support frame 20, the lower horizontal beam 24A and the upper horizontal beam 24B are disposed on the rear side of the intermediate beam 24 close to the counterweight 5. In addition to the both ends, both ends of the rear vertical beam 24C can be joined to the left vertical plate 14 and the left side frame 18. As a result, similar to the cab support beam 23, it is possible to suppress the occurrence of partial stress concentration at the joint between the left vertical plate 14 and the left side frame 18 and the intermediate beam 24. As a result, the joining strength of the intermediate beam 24 to the left vertical plate 14 and the left side frame 18 of the center frame 12 can be increased, and a greater strength can be secured against the left and right torsional forces acting on the revolving frame 11. Therefore, the rigidity of the entire turning frame 11 can be further increased.

  Next, FIGS. 6 and 7 show a second embodiment of the present invention. The feature of this embodiment is that the reinforcing members are spaced apart in the longitudinal direction inside the cab support beam and inside the intermediate beam. It is in having established. 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 second embodiment. This revolving frame 31 is substantially the same as the revolving frame 11 according to the first embodiment, and the center frame 12, the left side frame 18, and the right side frame. (Not shown), which is composed of a cab support frame 20, a cab support beam 32 (to be described later), an intermediate beam 34, etc., but the configurations of the cab support beam 32 and the intermediate beam 34 are different from those of the first embodiment. It is.

  Reference numeral 32 denotes a cab support beam positioned between the left vertical plate 14 and the left side frame 18 of the center frame 12 and located on the rear side of the cab support frame 20, and the cab support beam 32 is a cab shown in FIG. 7 is used for the second embodiment in place of the cab support beam 23 according to the first embodiment described above.

  Here, the cab support beam 32 is formed, for example, by bending a steel plate material, and faces the lower horizontal beam 32A extending in the left and right directions and the lower horizontal beam 32A with a certain interval in the upper and lower directions. The upper horizontal beam 32B extending in the left and right directions, the lower horizontal beam 32A and the upper horizontal beam 32B are connected at the rear side in the front and rear directions, the rear vertical beam 32C extending in the left and right directions, and the lower horizontal beam 32A It is formed with a U-shaped cross-sectional shape by an opening 32D opened over the entire area in the length direction on the front side in the front and rear directions with the upper horizontal beam 32B. Mount attachment holes 32E and 32E for attaching mount members (not shown) are provided on both left and right ends of the upper horizontal beam 32B.

  The cab support beam 32 is disposed between the left vertical plate 14 and the left side frame 18 with the opening 32D facing the cab support frame 20 and opened to the left and right of the cab support beam 32. One end in the direction is joined to the left side frame 18 by welding, and the other end in the left and right directions of the cab support beam 32 is joined to the bottom plate 13 and the left vertical plate 14 by welding.

  Reference numerals 33 and 33 are reinforcing plates as a plurality of (for example, two) reinforcing members provided in the cab support beam 32. Each of the reinforcing plates 33 is formed in a substantially rectangular flat plate shape using, for example, a steel plate material. Yes. The reinforcing plates 33 are arranged at appropriate intervals in the left and right directions, and are fixed to the inner side surfaces of the lower horizontal beam 32A, the upper horizontal beam 32B, and the rear vertical beam 32C constituting the cab support beam 32 by means of welding or the like. Has been. Thereby, the three box structures divided by the reinforcing plate 33 can be formed inside the cab support beam 32, and the strength of the cab support beam 32 itself can be increased.

  Reference numeral 34 denotes an intermediate beam located between the cab support frame 20 and the cab support beam 32 and provided between the left vertical plate 14 and the left side frame 18 of the center frame 12, and the intermediate beam 34 is described above. Instead of the intermediate beam 24 according to the first embodiment, it is used in the second embodiment.

  Here, like the cab support beam 32, the intermediate beam 34 is formed with a U-shaped cross section by a lower horizontal beam 34A, an upper horizontal beam 34B, a rear vertical beam 34C, and an opening 34D. The intermediate beam 34 is joined between the left vertical plate 14 and the left side frame 18 with the opening 34 </ b> D opening toward the cab support frame 20 on the front side.

  Reference numerals 35 and 35 denote reinforcing plates as a plurality of (for example, two) reinforcing members provided in the intermediate beam 34. Each of the reinforcing plates 35 is formed in a substantially rectangular flat plate shape using, for example, a steel plate material, and left , Arranged at right intervals in the right direction. Each reinforcing plate 35 is fixed to the inner side surfaces of the lower horizontal beam 34A, the upper horizontal beam 34B, and the rear vertical beam 34C constituting the intermediate beam 34 by means of welding or the like, and three boxes are provided inside the intermediate beam 34. By forming the structure, the strength of the intermediate beam 34 itself is increased.

  The revolving frame 31 used in the second embodiment has a structure in which a reinforcing plate 33 is provided inside the cab support beam 32 and a reinforcing plate 35 is provided inside the intermediate beam 34. There is no particular difference from that according to the first embodiment described above.

  However, according to the present embodiment, the strength of the cab support beam 32 itself can be increased by providing the reinforcing plate 33 inside the cab support beam 32, and by providing the reinforcing plate 35 inside the intermediate beam 34. The intensity of the intermediate beam 34 itself can be increased. As a result, the joining strength between the left vertical plate 14 and the left side frame 18 of the center frame 12 joined via the cab support frame 20, the cab support beam 32, and the intermediate beam 34 can be increased. The rigidity can be further increased.

  Next, FIG. 8 and FIG. 9 show a third embodiment of the present invention. 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 41 denotes a revolving frame according to the third embodiment. This revolving frame 41 is substantially the same as the revolving frame 11 according to the first embodiment, and the center frame 12, the left side frame 18, and the right side frame. (Not shown), which is composed of a cab support frame 20, a cab support beam 42 and an intermediate beam 44 described later, but the configurations of the cab support beam 42 and the intermediate beam 44 are different from those of the first embodiment. It is.

  Reference numeral 42 denotes a cab support beam positioned between the left vertical plate 14 and the left side frame 18 of the center frame 12 and located on the rear side of the cab support frame 20, and the cab support beam 42 is upward and downward. The lower horizontal beam 42A and the upper horizontal beam 42B extending in the left and right directions while facing each other, the rear side beam 42C extending in the left and right direction by connecting the rear side of the lower horizontal beam 42A and the upper horizontal beam 42B, and the lower horizontal beam 42A and the upper side A U-shaped cross section is formed by an opening 42D that opens to the front side of the horizontal beam 42B. In addition, mount attachment holes 42E and 42E for attaching mount members (not shown) are provided on both ends in the length direction of the upper horizontal beam 42B.

  Here, as shown in FIG. 9, when the width dimension of the lower horizontal beam 42A is A and the width dimension of the upper horizontal beam 42B is B, the width dimensions A and B are set to have the relationship of the following formula 1.

  In this way, by making the width dimension A of the lower horizontal beam 42A smaller than the width dimension B of the upper horizontal beam 42B, for example, maintenance and inspection work for operating devices (not shown) provided in the cab 7 can be performed. When performing from the lower surface side of the swivel frame 41, the work space can be expanded by reducing the width dimension A of the lower horizontal beam 42A of the cab support beam 42.

  Reference numerals 43 and 43 denote a plurality of reinforcing plates provided in the cab support beam 42. These reinforcing plates 43 are arranged at appropriate intervals in the left and right directions, and lower horizontal beams 42A constituting the cab support beam 42, The inner side surfaces of the upper horizontal beam 42B and the rear vertical beam 42C are fixed using means such as welding.

  Reference numeral 44 denotes an intermediate beam located between the cab support frame 20 and the cab support beam 42 and provided between the left vertical plate 14 and the left side frame 18 of the center frame 12, and the intermediate beam 44 is supported by the cab. Similarly to the beam 42, the lower horizontal beam 44A, the upper horizontal beam 44B, the rear vertical beam 44C, and the opening 44D are formed to have a U-shaped cross-sectional shape. The intermediate beam 44 joins the left vertical plate 14 and the left side frame 18 in a state where the opening 44 </ b> D is opened forward toward the cab support frame 20. In this case, similarly to the cab support beam 42, the width dimension A of the lower horizontal beam 44A is set to be smaller than the width dimension B of the upper horizontal beam 44B.

  Reference numerals 45 and 45 denote a plurality of reinforcing plates provided in the intermediate beam 44. These reinforcing plates 45 are arranged at appropriate intervals in the left and right directions, and the lower horizontal beam 44A and the upper horizontal beam constituting the intermediate beam 44 are provided. 44B and the rear longitudinal beam 44C are fixed to the inner side surfaces by means such as welding.

  The swivel frame 41 used in the third embodiment has the above-described configuration, and the width dimension A of the lower horizontal beam 42A constituting the cab support beam 42 is set smaller than the width dimension B of the upper horizontal beam 42B. The width A of the lower horizontal beam 44A constituting the intermediate beam 44 is set to be smaller than the width B of the upper horizontal beam 44B. The basic operation of the intermediate beam 44 is different from that of the first embodiment described above. There is no.

  However, according to the present embodiment, the width dimension A of the lower transverse beam 42A constituting the cab support beam 42 is set smaller than the width dimension B of the upper transverse beam 42B, and the width of the lower transverse beam 44A constituting the intermediate beam 44 is set. When the dimension A is set to be smaller than the width dimension B of the upper horizontal beam 44B, for example, maintenance and inspection work for operating devices (not shown) provided in the cab 7 is performed from the lower surface side of the swivel frame 41. In addition, the work space can be expanded by reducing the width dimension A of the lower transverse beam 42A of the cab support beam 42 and the width dimension A of the lower transverse beam 44A of the intermediate beam 44, thereby improving the workability of maintenance and inspection work. be able to.

  In the above-described first embodiment, the lower horizontal beam 24A and the upper horizontal beam 24B of the intermediate beam 24 are connected by the rear vertical beam 24C, so that the opening 24D of the intermediate beam 24 is moved forward and rearward. The case where it comprises so that it may open is illustrated. However, the present invention is not limited to this. For example, the opening 24D of the intermediate beam 24 may be configured to open to the rear side in the front and rear directions. The same applies to the second and third embodiments.

  Moreover, in 1st Embodiment mentioned above, the turning frame 11 which provided the intermediate beam 24 between the cab support frame 20 and the cab support beam 23 is illustrated. However, the present invention is not limited to this, and can also be applied to, for example, a swivel frame in which two beams of a cab support frame 20 and a cab support beam 23 are provided on the lower side of the cab 7. The same applies to the second and third embodiments.

  Further, in the above-described second embodiment, a case where two reinforcing plates 33 and 35 are provided inside the cab support beam 32 and the intermediate beam 34 is illustrated. However, the present invention is not limited to this. For example, one or three or more reinforcing plates may be provided. The same applies to the third embodiment.

  In the above-described third embodiment, the width dimension A of the lower horizontal beam 42A constituting the cab support beam 42 is set smaller than the width dimension B of the upper horizontal beam 42B, and the lower horizontal beam 44A constituting the intermediate beam 44 is set. The case where the width dimension A is set smaller than the width dimension B of the lower horizontal beam 44B is illustrated. However, the present invention is not limited to this. For example, the width dimension of the lower transverse beam 42A constituting the cab support beam 42 is set larger than the width dimension of the upper transverse beam 42B, and the width dimension of the lower transverse beam 44A constituting the intermediate beam 44 is set. It is good also as a structure set larger than the width dimension of the upper horizontal beam 44B.

  Furthermore, in each of the above-described embodiments, the swivel frame applied to the hydraulic excavator has been described as an example. However, the present invention is not limited to this and is widely applied to other construction machines such as a hydraulic crane. It is something that can be done.

It is a front view which shows the hydraulic shovel provided with the turning frame by the 1st Embodiment of this invention. It is a perspective view which shows a turning frame alone. It is a perspective view of the principal part expansion which expands and shows the cab support beam, intermediate beam, etc. in FIG. FIG. 4 is a partially broken plan view of the cab support beam, intermediate beam, and the like in FIG. 3 as viewed from above. It is sectional drawing which looked at a cab support beam, an intermediate beam, etc. from the arrow VV direction in FIG. FIG. 5 is a partially broken plan view similar to FIG. 4 showing a turning frame according to a second embodiment. It is sectional drawing which looked at the cab support beam, the intermediate beam, the reinforcement board, etc. from the arrow VII-VII direction in FIG. It is a partially broken top view similar to FIG. 4 which shows the turning frame by 3rd Embodiment. It is sectional drawing which looked at the cab support beam, the intermediate beam, the reinforcement board, etc. from the arrow IX-IX direction in FIG.

Explanation of symbols

1 Excavator (construction machine)
4 Working device 5 Counterweight 7 Cab 11, 31, 41 Turning frame (body frame)
12 Center frame 13 Bottom plate 14 Left vertical plate 15 Right vertical plate 18 Left side frame 19 Right side frame 20 Cab support frame 23, 32, 42 Cab support beam 23A, 24A, 32A, 34A, 42A, 44A Lower horizontal beam 23B, 24B, 32B, 34B, 42B, 44B Upper horizontal beam 23C, 24C, 32C, 34C, 42C, 44C Rear vertical beam 23D, 24D, 32D, 34D, 42D, 44D Opening 24, 34, 44 Intermediate beam 26, 27, 28, 29 Right extension beam 33, 35, 43, 45 Reinforcement plate (reinforcement member)

Claims (2)

  1. A vehicle body frame, a work device provided on the front side of the vehicle body frame, a counterweight provided on the rear side of the vehicle body frame for balancing the weight of the work device, and left and right across the work device Consisting of a cab located on one side of the direction and provided on the front side of the body frame,
    The vehicle body frame includes a center frame composed of a bottom plate and left and right vertical plates erected on the bottom plate, and a left frame disposed on both the left and right sides of the center frame and extending in the front and rear directions. , A right side frame, and a left and right beam, which are provided between the center frame and the left and right side frames, respectively, and join the left and right side frames to the center frame, and left and right directions A cab support frame connecting the front end side of the side frame located on one side and the center frame,
    In the construction machine, wherein the cab is configured to be supported by the cab support beam and the cab support frame that are located on the rear side of the cab support frame among the beams.
    The cab support beam and the intermediate beam located between the cab support frame and the cab support beam are a lower horizontal beam extending left and right, and a left and right facing the lower horizontal beam in the upper and lower directions. An upper horizontal beam extending in the direction, a rear vertical beam connecting the lower horizontal beam and the upper horizontal beam at the rear side in the front and rear directions, and an opening opening in front of the lower horizontal beam and the upper horizontal beam and in front of the rear direction The cross-sectional shape is formed in a U shape
    One end side of the cab support beam and the intermediate beam is joined to a side frame located on one side of the left and right directions, and the other end side is joined to the vertical plate and the bottom plate of the center frame. A featured construction machine.
  2.   The construction machine according to claim 1, wherein reinforcing members fixed to the lower horizontal beam, the upper horizontal beam, and the rear vertical beam are provided in the cab support beam at intervals in the left and right directions.
JP2008168684A 2008-06-27 2008-06-27 Construction machinery Active JP4740290B2 (en)

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JP2008168684A JP4740290B2 (en) 2008-06-27 2008-06-27 Construction machinery
KR1020090022398A KR101523777B1 (en) 2008-06-27 2009-03-17 Construction machinery
CN2009101503863A CN101614023B (en) 2008-06-27 2009-06-25 Construction machinery

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JP5541448B2 (en) * 2010-02-24 2014-07-09 株式会社神戸製鋼所 Construction vehicle
JP5180248B2 (en) * 2010-03-09 2013-04-10 株式会社神戸製鋼所 Support structure for hydraulic piping and work machine equipped with the same
JP5580681B2 (en) * 2010-07-22 2014-08-27 日立建機株式会社 Electric work vehicle
JP5666234B2 (en) * 2010-10-08 2015-02-12 日立建機株式会社 Construction machinery
JP5668421B2 (en) * 2010-11-10 2015-02-12 コベルコ建機株式会社 Construction machine upper frame
JP5465790B2 (en) * 2010-11-15 2014-04-09 日立建機株式会社 Construction machine swivel frame
DE112015000922T5 (en) * 2015-12-04 2016-11-03 Komatsu Ltd. working vehicle

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JPH063809B2 (en) * 1986-07-30 1994-01-12 日本電気株式会社 Semiconductor device
JPH0529258Y2 (en) * 1986-08-22 1993-07-27
JPH0218776A (en) * 1988-07-05 1990-01-23 Sanyo Electric Co Ltd Program time display method for revolving head type digital audio tape recorder
JPH0218776U (en) * 1988-07-25 1990-02-07
JP4477259B2 (en) * 2001-04-06 2010-06-09 日立建機株式会社 Construction machine swivel frame
JP2003082705A (en) * 2001-09-10 2003-03-19 Hitachi Constr Mach Co Ltd Turning frame of construction machine and its of manufacturing method
KR100753991B1 (en) * 2006-09-22 2007-08-24 볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비 Upper frame structure of supporting cab of construction machine

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KR101523777B1 (en) 2015-05-28
KR20100002081A (en) 2010-01-06
CN101614023A (en) 2009-12-30
CN101614023B (en) 2013-04-03

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