JP2018048511A - Construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a construction machine having a support structure of a cabin in which the characteristic frequency of rigid body vibration mode can be set high.SOLUTION: The construction machine includes: a main frame; a traveling body which is provided to the main frame for traveling; a cabin mounted on the main frame; and an anti-vibration mechanism 6 which is disposed interposing between the cabin and the main frame 4. The anti-vibration mechanism 6 has: a lower fixing part 12 which is fixed to the main frame 4 side, and which is disposed at the position higher than the floor plate 10 of the cabin; and an upper fixing part 14 which is fixed to the cabin 5 side, and which is disposed at the position higher than the lower fixing part 12.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a construction machine such as a hydraulic excavator, and more particularly to a cabin support structure on which a driver is boarded.

  In Japanese Patent Laid-Open No. 2006-168621 (Patent Document 1), a turning frame is provided via a turning mechanism on a lower traveling body having a running function, and a driver gets on a cab mounted on the turning frame. There is described a hydraulic excavator (construction machine) that performs operations such as excavation and lifting by operating a work machine while turning a turning frame (see paragraph 0002).

  When the hydraulic excavator travels, vibrations generated in the lower traveling body are transmitted to the cab via the turning frame, which affects the ride comfort of the driver. For this reason, in the hydraulic excavator of Patent Document 1, damper mounts are installed at four locations in a required distribution on the cab support frame provided on the vehicle body side frame (swivel frame), and the cab floor frame is supported by the damper mount. (See paragraph 0015).

JP 2006-168621 A

  The hydraulic excavator of Patent Document 1 has a structure in which four corners of a cab (hereinafter referred to as a cabin) are elastically supported by damper mounts. An anti-vibration rubber can be used instead of the damper mount, and will be described below as an anti-vibration rubber.

  FIG. 2 is a diagram showing a cabin support structure in a comparative example with the present invention. In the hydraulic excavator of Patent Document 1, the cabin support structure is configured as shown in FIG. In the support structure shown in FIG. 2, the cabin 5 is mounted on the main frame 4 (the turning frame of Patent Document 1), and the position where the cabin 5 is supported by the antivibration rubber 6 and the center of gravity 7 of the cabin 5 are separated. For this reason, the natural frequency of the rigid body vibration mode such as rolling and pitching of the cabin 5 which affects the riding comfort is low. If the natural frequency of the rigid body vibration mode is low, the cabin 5 is likely to shake greatly, so that the riding comfort is likely to deteriorate.

  An object of the present invention is to provide a construction machine having a cabin support structure that can set a high natural frequency in a rigid body vibration mode.

In order to achieve the above object, the construction machine of the present invention provides:
A main frame, a traveling body provided on the main frame and capable of traveling; a cabin mounted on the main frame; and a vibration isolation mechanism disposed so as to be interposed between the cabin and the main frame. In the construction machine provided,
The vibration isolating mechanism is configured such that a lower fixing portion fixed to the main frame side is disposed at a position higher than a floor plate of the cabin, and an upper fixing portion fixed to the cabin side is the lower fixing portion. It is arranged at a higher position.

  ADVANTAGE OF THE INVENTION According to this invention, the distance of the gravity center position of a cabin and the support position of the cabin by an anti-vibration mechanism can be shortened, and the natural frequency of a rigid body vibration mode can be set high in the support structure of a cabin. Thereby, the riding comfort of the construction machine can be improved. Problems, configurations, and effects other than those described above will be clarified by the following description of embodiments.

It is a figure which shows the external appearance of one Example which concerns on the hydraulic shovel of this invention. It is a figure which shows the support structure of the cabin in a comparative example with this invention. 1 is a schematic diagram illustrating an appearance of a cabin according to a first embodiment. 3 is an enlarged view of a support portion in the cabin support structure according to Embodiment 1. FIG. 3 is a cross-sectional view of a support portion in the cabin support structure according to Embodiment 1. FIG. It is a figure which shows the effect of the cabin support structure which concerns on Example 1. FIG. 3 is a cross-sectional view of a support portion in the cabin support structure according to Embodiment 1. FIG. 3 is a cross-sectional view of a support portion in the cabin support structure according to Embodiment 1. FIG. 6 is an enlarged view of a support portion in a cabin support structure according to Embodiment 2. FIG. 6 is a cross-sectional view of a support portion in a cabin support structure according to Embodiment 2. FIG. It is a figure which shows the relationship between the vibration proof characteristic of a vibration proof mechanism, and temperature. It is a figure which shows the relationship between input acceleration and the vibration proof characteristic of a vibration proof mechanism. 6 is a cross-sectional view of a support portion in a cabin support structure according to Embodiment 2. FIG. 6 is a cross-sectional view of a support portion in a cabin support structure according to Embodiment 2. FIG. 6 is an enlarged view of a support portion in a cabin support structure according to Embodiment 3. FIG. 6 is a cross-sectional view of a support portion in a cabin support structure according to Embodiment 3. FIG. It is an enlarged view of the support part in the cabin support structure which concerns on Example 4. FIG. It is sectional drawing of the support part in the cabin support structure which concerns on Example 4. FIG.

  FIG. 1 is a view showing an appearance of an embodiment according to the hydraulic excavator of the present invention. A hydraulic excavator 100 illustrated in FIG. 1 is applied to the first to fourth embodiments. In this embodiment, a hydraulic excavator will be described as an example of a construction machine. However, the cabin support structure according to the present invention is applicable to construction machines other than the hydraulic excavator.

  The excavator 100 includes a lower traveling body 1 that enables traveling, an upper revolving body 2 that is turnably mounted on the lower traveling body 1, and an excavation and lifting operation provided in front of the upper revolving body 2. And a work device 3 for performing the above. On the upper swing body 2, a hydraulic pump (not shown) and an engine (not shown) for driving the hydraulic pump are mounted on the rear side of the main frame (swing frame) 4. The upper swing body 2 is mounted with a cabin 5, a fuel tank and a hydraulic oil tank (not shown) on the front side of the main frame 4.

  When the hydraulic excavator 100 travels, vibration generated in the lower traveling body 1 is transmitted to the cabin 5 through the upper swing body 2 and affects the ride comfort of the passenger. Therefore, the cabin 5 is generally a structure in which positions corresponding to the four corners of the lower surface of the cabin 5 are elastically supported by a vibration isolating member or a vibration isolating mechanism (hereinafter referred to as a vibration isolating mechanism 6) such as a vibration isolating rubber or a damper mount. It has become. As a result, the excavator 100 has a structure in which transmission of vehicle body vibration to the cabin 5 is suppressed.

  A first embodiment (embodiment 1) of the present invention will be described with reference to FIGS.

FIG. 3 is a schematic diagram illustrating an appearance of the cabin according to the first embodiment.
The cabin 5 includes a cabin frame 8 provided at a lower portion, a floor plate 10 that covers the lower surface of the cabin 5 so as to shield the interior of the cabin 5 from the outside, and attachment members 9 provided at four corners of the cabin frame 8; Is provided. The lower surface of the cabin 5 has a rectangular shape, and the cabin frame 8 also has a rectangular shape. The cabin 5 has a structure that is elastically supported by the main frame 4 by the vibration isolation mechanism 6 included inside the attachment member 9 at the four corners of the cabin frame 8.

  In the present embodiment, the support position of the cabin 5 is located inside the cabin 5 in the vertical direction (vertical direction). For this reason, the distance from the fastening portion between the vibration isolating mechanism 6 and the attachment member 9 to the gravity center position 7 is shorter than when the support position of the cabin 5 is disposed on the lower surface of the cabin 5.

FIG. 4 is an enlarged view of a support portion in the cabin support structure according to the first embodiment.
A fixing portion (supporting portion) of the vibration isolation mechanism 6 that is fastened to the attachment member 9 and supports the attachment member 9 is covered with the attachment member 9 that extends from the cabin frame 8 that constitutes the cabin 5. The attachment member 9 is joined to the cabin frame 8 and integrated with the cabin frame 8. The attachment member 9 may be molded integrally with the cabin frame 8.

  The floor plate 10 is joined to the mounting member 9, and the mounting member 9 also serves to support the floor plate 10.

FIG. 5 is a cross-sectional view of the support portion in the cabin support structure according to the first embodiment.
The attachment member 9 constitutes a cabin-side fixing portion, has a rectangular cross section perpendicular to the vertical direction, and has four side surfaces (side walls) 9A extending in the vertical direction. An upper surface (upper surface wall) 9B is provided at the upper ends of the four side surfaces 9A, and the attachment member 9 has a structure in which a space 9C surrounded by the side surfaces 9A and the upper surface 9B is formed. The upper surface 9B constitutes a mounting surface (fixed surface) of the vibration isolation mechanism 6.

  Further, the support member 11 constitutes a main frame side fixing portion, a cross section perpendicular to the vertical direction is rectangular, and has four side surfaces (side walls) 11A extending in the vertical direction. An upper surface (upper surface wall) 11B is provided at the upper ends of the four side surfaces 11A, and the support member 11 has a structure in which a space 11C surrounded by the side surfaces 11A and the upper surface 11B is formed. The upper surface 11B constitutes a mounting surface (fixed surface) of the vibration isolation mechanism 6.

  The attachment member 9 and the support member 11 are not limited to those having a rectangular cross section perpendicular to the vertical direction, and may have other shapes. Therefore, the number of the side surfaces 9A and the side surfaces 11A is not limited to four.

  The anti-vibration mechanism 6 includes an anti-vibration rubber (solid rubber) 6A, a lower fastening plate 12, a lower fastening member (bolt) 13, an upper fastening member (nut) 14, and a damping mechanism 15. Composed. The anti-vibration rubber 6 </ b> A is an elastic member, and is fixed to the lower fastening plate 12 and configured integrally with the lower fastening plate 12.

  The lower fastening plate 12 of the vibration isolation mechanism 6 is fixed to the upper surface 11B of the support member 11 extending from the main frame 4 with the lower fastening member 13. The lower fastening member 13 fastens the lower side of the vibration isolating rubber 6A. The part (lower fastening plate 12) of the anti-vibration rubber 6A fastened by the lower fastening member 13 is referred to as a lower fastening part (lower fixing part). The support member 11 provided on the main frame 4 side constitutes (main frame side holding portion) to which the lower fastening portion (lower side fixing portion) of the vibration isolation mechanism 6 is fixed (held).

  The anti-vibration rubber 6A is integrally provided with a bolt (not shown). The bolt penetrates the upper surface 9B of the mounting member 9 and protrudes upward from the upper surface 9B. By fastening the upper fastening member 14 to the bolt, the upper end portion of the vibration isolating rubber 6 </ b> A is fixed to the mounting member 9. A portion where the anti-vibration rubber 6A is fastened to the mounting member 9 by the upper fastening member 14 is referred to as an upper fastening portion (upper fixing portion). And the attachment member 9 provided in the cabin 5 side comprises the cabin side fixing | fixed part (cabin side holding | maintenance part) to which the upper side fastening part (upper side fixing | fixed part) of the vibration proofing mechanism 6 is fixed (hold | maintained).

  The cabin 5 is elastically supported by the anti-vibration mechanism 6 by fixing the anti-vibration rubber 6 </ b> A to the support member 11 by the lower side fastening member 13 and fixing to the attachment member 9 by the upper side fastening member 14. That is, the anti-vibration rubber 6A is interposed between the support member 11 and the attachment member 9, and the attachment member 9 is supported by the support member 11 via the anti-vibration rubber 6A.

  In the support member 11, the fixing portion of the vibration isolating mechanism 6 has a convex shape inside the cabin (that is, upward), and the attachment member 9 has a concave shape inside the cabin. For this reason, the support position of the cabin 5 by the vibration isolation mechanism 6 is located above the floor plate 10. For this purpose, the upper surface 11 </ b> B of the support member 11 is positioned above the floor plate 10, and the fixing portion of the vibration isolating rubber 6 </ b> A is disposed at a position higher than the floor plate 10.

  With this support structure, the distance from the gravity center position 7 of the cabin 5 to the lower fastening portion 13 of the vibration isolation mechanism 6 can be made shorter than when the support position of the cabin 5 is disposed on the lower surface of the cabin 5.

  In the present embodiment, a liquid chamber 15A in which the liquid 15C is placed is provided in the vibration isolation mechanism 6, and an attenuation plate 15B is disposed inside the liquid chamber 15. The liquid chamber 15A, the attenuation plate 15B, and the liquid 15C constitute the attenuation mechanism 15 of the vibration isolation mechanism 6. The liquid chamber 15 contains a high viscosity silicone oil as the liquid 15C, and is configured to stir the oil 15C with the damping plate 15B in the liquid chamber 15A. The mechanism 6 can be configured.

  The support member 11 is a member that arranges the upper surface 11 </ b> B to which the vibration isolation mechanism 6 is fixed at a position higher than the floor plate 10 in order to hold the vibration isolation mechanism 6 at a position higher than the floor plate 10. The side surface 11 </ b> A of the support member 11 forms a step in the vertical direction (height direction) between the upper surface 11 </ b> B and the floor plate 10 so that the upper surface 11 </ b> B is positioned higher than the floor plate 10.

  That is, the support member 11 is a step forming member on the main frame 4 side that forms a step in the vertical direction (height direction) between the upper surface 11B to which the vibration isolation mechanism 6 is fixed and the floor plate 10. The side surface 11 </ b> A of the support member 11 forms a step surface in the vertical direction with respect to the main frame 4.

Since the vibration isolation mechanism 6 is lifted to a position higher than the floor plate 10 by the support member 11, the attachment member 9 has the upper surface 9 </ b> B to which the upper end portion of the vibration isolation mechanism 6 is fixed as the upper surface of the floor plate 10 and the support member 11. It is a member arranged at a position higher than 11B.
The side surface 9A of the mounting member 9 has a step in the vertical direction (height direction) between the upper surface 9B and the floor plate 10 so that the upper surface 9B is positioned higher than the upper surface 11B of the floor plate 10 and the support member 11. Form.

  That is, the mounting member 9 is a floor plate 10 (cabin 5, cabin frame 8) that forms a step in the vertical direction (height direction) between the upper surface 9B to which the upper end portion of the vibration isolating mechanism 6 is fixed and the floor plate 10. This is a side step forming member. The side surface 9 </ b> A of the attachment member 9 constitutes a step surface in the vertical direction with respect to the floor plate 10 of the cabin 5.

  The support member 11 and the attachment member 9 may have a form other than that shown in the figure as long as the above-described step can be formed.

FIG. 6 is a diagram illustrating the effect of the cabin support structure according to the first embodiment.
FIG. 6 shows the relationship between the natural frequency and the distance that the upper fastening portion 14 of the vibration isolating mechanism 6 is shifted into the cabin 5. In FIG. 6, 0 mm is a case where the upper fastening portion 14 is provided at the same height as the lower surface (floor plate 10) of the cabin 5, and +100 mm is a case where the shift amount is shifted 100 mm upward compared to the case where the shift amount is 0 mm. +200 mm is the case where the shift amount is shifted upward by 200 mm compared to the case where the shift amount is 0 mm.

  As shown in FIG. 6, the distance between the upper fastening portion 14 and the gravity center position 7 becomes shorter as the upper fastening portion 14 shifts into the cabin 5 and is disposed upward. Then, the natural frequency of the rolling vibration or pitching vibration of the cabin 5 that contributes to the riding comfort shifts to the high frequency side.

  Generally, in the rigid body vibration mode, when the input acceleration component to the cabin 5 is constant without depending on the frequency, the vibration amplitude decreases as the natural frequency increases. Furthermore, the time until the vibration is reduced is shortened by increasing the attenuation. As a result, by applying the present invention, the vibration of the cabin 5 can be reduced and the riding comfort can be improved.

FIG. 7 is a cross-sectional view of the support portion in the cabin support structure according to the first embodiment.
FIG. 7 shows a modification (first modification) in which the structure of the vibration isolation mechanism 6 is changed with respect to the cabin support structure of the first embodiment. In this modification, the same components as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and description thereof is omitted. Further, parts different from the first embodiment will be described as appropriate.

  In this modification, instead of the anti-vibration rubber 6A of the liquid-filled anti-vibration mechanism 6 of the first embodiment, a case where an anti-vibration rubber 6B composed of one-side fixed solid rubber is mounted is illustrated. The anti-vibration mechanism 6 of this modification includes an anti-vibration rubber (solid rubber) 6B, a lower fastening plate 12, a lower fastening member (bolt) 13, an upper fastening member (bolt) 14, and an upper fastening plate 16. And comprising.

  The lower end surface of the solid rubber 6 </ b> B is fixed to the lower fastening plate 12. The upper end surface of the solid rubber 6B is fixed to the upper fastening plate 16. That is, the solid rubber 6 </ b> B is configured integrally with the lower fastening plate 12 and the upper fastening plate 16.

  The lower fastening plate 12 is fixed to the support member 11 by the lower fastening member 13 as in the first embodiment. The upper fastening plate 16 is fixed to the upper surface 9B of the mounting member 9 by the upper fastening member 14. In this case, the upper fastening member 14 is a bolt, and the upper fastening plate 16 is fixed to the lower surface side of the upper surface 9B of the mounting member 9. In the present modification, the upper fastening portion (upper fixing portion) to which the vibration isolating rubber 6 </ b> A is fastened to the attachment member 9 is configured by the upper fastening plate 16.

  In the present modification, the upper fastening portion 14 and the lower fastening portion 13 of the solid rubber 6 </ b> B are disposed on one side with respect to the upper surface 9 </ b> B of the attachment member 9. Based on the fastening structure of the solid rubber 6B, the solid rubber 6B of this modification is referred to as a one-side fixed type solid rubber.

  The one-side fixed type solid rubber 6B of this modification does not include the damping mechanism 15 that enhances the damping. Therefore, the vibration damping effect is smaller than that of the vibration isolation mechanism 6 of the first embodiment, but the same effect as that of the first embodiment can be obtained.

FIG. 8 is a cross-sectional view of the support portion in the cabin support structure according to the first embodiment.
FIG. 8 shows a modification (second modification) in which the structure of the vibration isolation mechanism 6 is changed with respect to the cabin support structure of the first embodiment. In this modification, the same components as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and description thereof is omitted. Further, parts different from the first embodiment will be described as appropriate.

  In this modification, instead of the anti-vibration rubber 6A of the liquid-filled anti-vibration mechanism of the first embodiment, a case where an anti-vibration rubber 6B made of sandwiched solid rubber is mounted is illustrated. The anti-vibration mechanism 6 of this modification includes an anti-vibration rubber (first solid rubber 6C1, second solid rubber 6C2) 6C, a lower fastening plate 12, a lower fastening member (bolt) 13, and an upper fastening member ( Nut) 14 and an upper fastening plate 16.

  The sandwiching type solid rubber 6C has a first solid rubber 6C1 disposed between the support member 11 and the mounting member 9, and a second solid rubber 6C2 disposed between the mounting member 9 and the upper fastening plate 16. It has a structure.

  The lower end surface of the solid rubber 6C1 is fixed to the lower fastening plate 12. The upper end surface of the solid rubber 6C2 is fixed to the upper fastening plate 16. The lower fastening member 13 and the upper fastening member 14 are fastened so that the attachment member 9 is sandwiched between the first solid rubber 6C1 and the second solid rubber 6C2, and the vibration isolation mechanism 6 is attached to the attachment member 9 and the support member 11. Fix it.

  In the present modification, the upper fastening portion (upper fixing portion) of the vibration isolating rubber 6 </ b> A is configured by the upper fastening plate 16, but this upper fastening portion does not directly fasten the upper fastening plate 16 to the mounting member 9. . The lower fastening member (bolt) 13 passes through the support member 11, the lower fastening plate 12, the first solid rubber 6 </ b> C <b> 1, the attachment member 9, the second solid rubber 6 </ b> C <b> 2, and the upper fastening plate 16, and the upper fastening member (nut) 14. The sandwiched solid rubber 6 </ b> C is held with respect to the attachment member 9 and the support member 11.

  In this modification, the lower fastening member 13 is a bolt and the upper fastening member 14 is a nut. As a result, the assembly work can be carried out efficiently. However, the lower fastening member 13 'can be a nut and the upper fastening member 14 can be a bolt.

  Also in the vibration isolating mechanism 6 using the sandwiching type solid rubber 6C of FIG.

  A second embodiment (embodiment 2) of the present invention will be described with reference to FIGS. In this modification, the same components as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and description thereof is omitted. Further, parts different from the first embodiment will be described as appropriate.

FIG. 9 is an enlarged view of a support portion in the cabin support structure according to the second embodiment.
The vibration isolating mechanism 6 of this modification includes an anti-vibration rubber 6A, a lower fastening plate 12, a lower fastening member (bolt) 13, an upper fastening member (nut) 14, and a damping mechanism 15. Composed. The anti-vibration mechanism 6 and its mounting structure of this modification are the same as those of the first embodiment.

  The main difference from Example 1 is that each of the attachment member 9 and the support member 11 is provided with a hole 17 penetrating each member. That is, the attachment member 9 extending from the cabin frame 8 is provided with a hole 17 in a side surface 9A extending in the vertical direction so as to penetrate the side surface 9A. Further, the support member 11 extending from the main frame 4 is provided with a hole 17 in a side surface 11A extending in the vertical direction so as to penetrate the side surface 11A. The hole 17 forms an opening on the side surface 9A and the side surface 11A.

  In the present embodiment, by providing the holes 17, the air in the cabin 5 flows around the vibration isolation mechanism 6, the ambient temperature of the vibration isolation mechanism 6 approaches the cabin 5 internal temperature, and the ambient temperature of the vibration isolation mechanism 6. And the cabin 5 temperature can be made uniform.

FIG. 10 is a cross-sectional view of the support portion in the cabin support structure according to the second embodiment.
In the present embodiment, in order to equalize the internal temperature of the cabin 5 and the ambient temperature of the vibration isolation mechanism 6, a main frame side isolation plate (main frame side isolation member) 18 is provided on the support member 11 extending from the main frame 4. A cabin side isolation plate (cabin side isolation member) 19 is installed on the attachment member 9 extending from the cabin 5. The main frame side separator 18 is provided in the lower part (opening part) of the space 11C. The cabin side separator is provided between the attachment member 9 and the support member 11 at the lower portion (opening portion) of the space 11C.

  The main frame side isolation plate 18 and the cabin side isolation member 19 block the inflow and outflow of outside air to the spaces 9C and 11C in which the vibration isolation mechanism 6 is disposed. That is, the main frame side isolation plate 18 and the cabin side isolation member 19 are isolation members that block the space in which the vibration isolation mechanism 6 including the damping mechanism 15 is disposed from outside air.

  The material of the main frame side separator 18 is a steel material such as SS400. On the other hand, the material of the cabin side separation member 19 is preferably a material that does not affect the behavior of the vibration isolation mechanism 6 such as natural rubber or synthetic rubber.

  The effects obtained by controlling the temperature of the vibration isolation mechanism 6 will be described with reference to FIGS. 11 and 12.

FIG. 11 is a diagram illustrating the relationship between the vibration isolation characteristics of the vibration isolation mechanism and the temperature.
In FIG. 11, the horizontal axis represents frequency and the vertical axis represents vibration transmissibility. In the frequency range where the vibration transmissibility is 1 or more, the acceleration component transmitted to the cabin 5 by the vibration isolation mechanism 6 is amplified. On the other hand, in the frequency range where the vibration transmissibility is 1 or less, the vibration isolation mechanism 6 reduces the acceleration component. Since the rubber part of the vibration isolation mechanism 6 is made of resin, the rigidity changes depending on the temperature. Generally, when the ambient temperature is lowered, the rigidity is increased, and the natural frequency of the vibration isolation mechanism 6 is shifted to the high frequency side. On the other hand, when the ambient temperature increases, the rigidity decreases, and the natural frequency of the vibration isolation mechanism 6 shifts to the low frequency side.

  FIG. 12 is a diagram illustrating the relationship between the input acceleration and the vibration isolation characteristics of the vibration isolation mechanism. Note that the input acceleration in this case is the input acceleration transmitted to the cabin 5.

  Here, it is assumed that an input acceleration peak of 10 Hz or less is a forced acceleration caused by running vibration generated in the lower traveling body 1, and a peak of 20 Hz or more is assumed to be a forced acceleration generated by engine vibration. The frequency of the forced acceleration A generated by the lower traveling body 1 during traveling is determined by the traveling speed, and the frequency of the forced acceleration B generated by engine vibration is determined by the engine speed and does not depend on the temperature. Therefore, the input acceleration is an acceleration input having a constant frequency component.

  On the other hand, the anti-vibration characteristic of the anti-vibration mechanism 6 is a characteristic depending on temperature. If the temperature around the vibration isolation mechanism 6 rises, the vibration isolation characteristics of the vibration isolation mechanism 6 will shift to the low frequency side, and the peak of the forced acceleration A due to the running vibration exemplified will increase. , Ride comfort gets worse. Further, if the temperature around the vibration isolation mechanism 6 decreases, the vibration isolation characteristics of the vibration isolation mechanism 6 shift to the high frequency side, and the peak of the forced acceleration B due to the exemplified engine vibration increases. And the ride quality gets worse. In general, the anti-vibration mechanism 6 is designed so as to obtain the most anti-vibration effect in the characteristics at room temperature, so that the ride comfort is deteriorated when the anti-vibration characteristic of the anti-vibration mechanism 6 changes due to the outside air temperature. Will do.

  In the present embodiment, a stable riding comfort can be realized by reducing the fluctuation of the ambient temperature of the vibration isolation mechanism 6. The anti-vibration mechanism 6 shown in FIG. 10 is a liquid-filled anti-vibration mechanism that has a damping characteristic enhanced by providing the damping mechanism 15.

FIG. 13 is a cross-sectional view of the support portion in the cabin support structure according to the second embodiment.
FIG. 13 shows a modification (third modification) in which the structure of the vibration isolation mechanism 6 is changed with respect to the cabin support structure of the second embodiment. This modification is different from the first modification in that a hole 17 is provided in the attachment member 9 and a cabin side isolation member 19 is further provided.

  In the case of the one-side fixed solid rubber 6B without the damping mechanism 15 (first modification of the first embodiment), as shown in FIG. 13, the hole 17 of the support member 11 and the main frame side separator 18 are unnecessary. In this case, even if the hole 17 of the support member 11 and the main frame side separator 18 are not provided, the same effect as in the second embodiment can be obtained.

FIG. 14 is a cross-sectional view of the support portion in the cabin support structure according to the second embodiment.
FIG. 14 shows a modification (fourth modification) in which the structure of the vibration isolation mechanism 6 is changed with respect to the cabin support structure of the second embodiment. This modification is different from the second modification in that a hole 17 is provided in the attachment member 9 and a cabin side isolation member 19 is further provided.

  In the case of the sandwich-type solid rubber 6C (second modified example of the first embodiment), the hole 17 of the support member 11 and the main frame side separator 18 are unnecessary, and the structure as shown in FIG. The effect of can be obtained.

  A third embodiment (embodiment 3) of the present invention will be described with reference to FIGS. In the present embodiment, the same configurations as those of the first or second embodiment are denoted by the same reference numerals as those of the first or second embodiment, and the description thereof is omitted. Further, parts different from the first embodiment or the second embodiment will be described as appropriate.

  The anti-vibration mechanism 6 and its mounting structure of the present embodiment are the same as those of the first embodiment. Therefore, the vibration isolating mechanism 6 of this embodiment includes the vibration isolating rubber 6A, the lower fastening plate 12, the lower fastening member (bolt) 13, the upper fastening member (nut) 14, and the damping mechanism 15. It is prepared for.

FIG. 15 is an enlarged view of a support portion in the cabin support structure according to the third embodiment.
The main difference between the present embodiment and the first embodiment is that the periphery of the support portion of the vibration isolation mechanism 6 is not covered by the attachment member 9 extending from the cabin frame 8. In the first embodiment, the mounting member 9 has a rectangular cross section perpendicular to the vertical direction, and the inside of the mounting member 9 is surrounded by four side surfaces (side walls) 9A extending in the vertical direction. On the other hand, in this embodiment, at least one of the four side surfaces 9A of the attachment member 9 is notched, and a part of the side surface 9A does not exist in the circumferential direction.

  In the second embodiment, the mounting member 9 is provided with the hole 17, whereas in the present embodiment, an opening 9 </ b> D having a larger opening area than the hole 17 is formed.

  Although it is not necessary to cut out the entire surface of the side surface 9A, an opening 9D larger than the hole 17 of the second embodiment is formed. For this purpose, an opening 9D that cuts from the upper end to the lower end of the side surface 9A is preferably provided.

  The mounting member 9 only needs to support the upper surface 9B to which the vibration isolating mechanism 6 is fixed above the floor plate 10 in order to lift the vibration isolating mechanism 6 above the floor plate 10. That is, the side surface 9A has a form other than the illustrated form as long as a step in the vertical direction (height direction) can be formed between the top face 9B and the floor plate 10 so that the top face 9B is located above the floor plate 10. There may be.

FIG. 16 is a cross-sectional view of the support portion in the cabin support structure according to the third embodiment.
In this embodiment, as shown in FIG. 16, a cabin side separator 19 is installed under the attachment portion 9 extending from the cabin 5 and the floor plate 10, so that the outside air does not flow. Since a part of the side surface 9A of the attachment member 9 is cut from the upper end to the lower end, a part of the cabin side separator 19 is connected to the floor plate 10. The support member 11 is not provided with an opening including the hole 17. Thereby, the same effect as Example 1 (a modification is included) and Example 2 is acquired.

  A fourth embodiment of the present invention will be described with reference to FIGS. In the present embodiment, the same configurations as those of the first to third embodiments are denoted by the same reference numerals as those of the first to third embodiments, and the description thereof is omitted. Further, parts different from the first to third embodiments will be described as appropriate.

  The anti-vibration mechanism 6 and its mounting structure of the present embodiment are the same as those of the first embodiment. Therefore, the vibration isolating mechanism 6 of this embodiment includes the vibration isolating rubber 6A, the lower fastening plate 12, the lower fastening member (bolt) 13, the upper fastening member (nut) 14, and the damping mechanism 15. It is prepared for.

FIG. 17 is an enlarged view of a support portion in the cabin support structure according to the fourth embodiment. FIG. 18 is a cross-sectional view of the support portion in the cabin support structure according to the fourth embodiment.
The main difference between the present embodiment and the third embodiment is that a hole 17 and a main frame side separator 18 are provided in the support member 11. Other configurations are the same as those of the third embodiment. In this case, as shown in FIG. 18, the main frame side separator 18 is installed on the support member 11 extending from the main frame 4, so that outside air does not flow through the space 11 </ b> C and the hole 17 of the support member 11. To do.

  Thereby, the cabin support structure of a present Example can have an effect similar to Example 3. FIG.

  The support member 11 may have an opening formed by cutting out a part of the side surface 9 </ b> A instead of the hole 17, like the attachment member 9 of the third embodiment.

  In the cabin support structure of the third embodiment, the vibration isolating mechanism 6 of the first embodiment, the support member 11 having the hole 17 and the main frame side separator 18 of the second embodiment, and the side surface 9A of the third embodiment are cut away. This is a combination of the attachment member 9.

  Thus, the present invention is not limited to the above-described embodiments, and includes various modifications. For example, each of the above-described embodiments has been described in detail for easy understanding of the present invention, and is not necessarily limited to one having all the configurations. Further, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. Further, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

  The embodiment according to the present invention provides means for improving the ride comfort by increasing the natural frequency of the rigid body vibration mode that contributes to the ride comfort such as rolling and pitching of the cabin 5. For this purpose, for example, in a structure including a cabin 5, a main frame 4 on which the cabin 5 is mounted, and a vibration isolation mechanism 6 having a vibration isolation rubber that supports the cabin 5, the attachment member 9 extending from the cabin 5 is a cabin. 5 has a concave structure, the support member 11 extending from the main frame 4 has a convex structure in the cabin 5, and the attachment member 9 and the support member 11 are connected by the vibration isolation mechanism 6. Have

  Thereby, the distance between the gravity center position 7 of the cabin 5 and the fastening portion (fixed portion) on the support member 11 side of the vibration isolation mechanism 6 can be shortened, and the moment of inertia of the cabin 5 with respect to the fastening portion of the vibration isolation mechanism 6 can be reduced. Can be reduced. As a result, the natural frequency of the rigid body vibration mode that contributes to the riding comfort such as rolling vibration and pitching vibration of the cabin 5 can be set high, and the riding comfort can be improved.

  Alternatively, in the structure including the cabin 5, the main frame 4 on which the cabin 5 is mounted, and the vibration isolation mechanism 6 having the vibration isolation rubber that supports the cabin 5, the attachment member 9 extending from the cabin 5 is provided in the cabin 5. The support member 11 having a concave structure and extending from the main frame has a convex structure in the cabin 5, and the attachment member 9 and the support member 11 are connected by the vibration isolation mechanism 6. An opening is provided on the side surfaces of the member 9 and the support member 11, and the vibration isolation mechanism 6 is positioned in a space communicating with the cabin 5.

  As a result, the natural frequency of the rigid body vibration mode that contributes to the riding comfort such as rolling vibration and pitching vibration of the cabin 5 can be designed to be high, and the cabin 5 having the temperature adjustment function and the vibration isolation mechanism 6 can be placed in the same space. By disposing, it is possible to suppress changes in the characteristics of the vibration isolating rubber of the vibration isolating mechanism 6 due to changes in the outside air temperature, and to obtain stable vibration isolating characteristics.

  DESCRIPTION OF SYMBOLS 1 ... Lower traveling body, 2 ... Upper turning body, 3 ... Working apparatus, 4 ... Main frame, 5 ... Cabin, 6 ... Vibration isolating mechanism, 7 ... Center of gravity position, 8 ... Cabin frame, 9 ... Mounting member (step formation member) , Cabin side fixing portion), 9A... Side surface (step surface) of mounting member, 9B... Upper surface of mounting member (mounting surface or fixing surface of vibration isolation mechanism 6), 9C. ... support member (step forming member, main frame side fixing portion), 11A ... side surface (step surface) of support member, 11B ... upper surface of support member (mounting surface or fixing surface of vibration isolation mechanism 6), 11C ... of support member Space, 12 ... lower fastening plate (lower fastening portion, lower fixing portion), 13 ... lower fastening member, 14 ... upper fastening member (upper fastening portion, upper fixing portion), 15 ... damping mechanism, 16 ... upper side Fastening plate (upper fastening part, upper fixing part), 17 ... (Opening), 18 ... main frame side separator (main frame side isolation member), 19 ... cabin side separator (cabin side isolation member).

Claims (6)

A main frame, a traveling body provided on the main frame and capable of traveling; a cabin mounted on the main frame; and a vibration isolation mechanism disposed so as to be interposed between the cabin and the main frame. In the construction machine provided,
The vibration isolating mechanism is configured such that a lower fixing portion fixed to the main frame side is disposed at a position higher than a floor plate of the cabin, and an upper fixing portion fixed to the cabin side is the lower fixing portion. A construction machine characterized by being placed at a higher position. The construction machine according to claim 1,
The main frame side fixing portion provided on the main frame side and to which the lower fixing portion of the vibration isolation mechanism is fixed includes a side surface extending in the vertical direction, and an upper surface provided on the upper end portion of the side surface, Have
The cabin side fixing portion provided on the cabin side and to which the upper side fixing portion of the vibration isolation mechanism is fixed has a side surface extending in the vertical direction and an upper surface provided on the upper end portion of the side surface. ,
The construction machine according to claim 1, wherein a side surface of the cabin side fixing portion is extended to a position higher than a side surface of the main frame side fixing portion. The construction machine according to claim 2,
The construction machine according to claim 1, wherein the side surface of the cabin side fixing portion forms a step surface in the vertical direction with respect to the floor plate of the cabin. The construction machine according to claim 3,
The construction machine according to claim 1, wherein the side surface of the main frame side fixing portion constitutes a step surface in the vertical direction with respect to the main frame. The construction machine according to claim 4,
The cabin side fixing portion has a space formed by the side surface and the upper surface of the cabin side fixing portion,
The vibration isolation mechanism is disposed in the space,
The cabin side fixing portion is provided between the main frame side fixing portion and an opening provided on the side surface of the cabin side fixing portion to communicate the cabin interior and the space, and blocks the space from outside air. And a cabin side isolation member. The construction machine according to claim 5,
The main frame side fixing portion includes a space formed by the side surface and the upper surface of the main frame side fixing portion, and the space of the main frame side fixing portion provided on the side surface of the main frame side fixing portion. An opening that communicates with the space of the cabin side fixing portion, and a main frame side isolation member that blocks the space of the main frame side fixing portion from outside air,
The construction machine according to claim 1, wherein the anti-vibration mechanism includes a damping mechanism that is disposed in the space of the fixing portion on the main frame side and attenuates vibration.

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