JP2011117194A - Construction machinery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable inexpensive manufacture by simplifying a constitution of a floor supporting mechanism by means of a vibration-proof member put as a general-purpose product on sale. <P>SOLUTION: The floor supporting mechanism 17 includes: a hinge member 18 which comprises an upside bracket 19 provided in a front-side position of a tilt floor 9, a downside bracket 20, and a connecting pin 21; and the vibration-proof member 22 which is positioned on the downside of the hinge member 18, which is provided between a front-side position of a revolving frame 5 and the downside bracket 20, and which suppresses vibrations between the revolving frame 5 and the tilt floor 9. Thus, the hinge member 18 can employ a simple constitution using only a small number of components composed of the upside bracket 19, the downside bracket 20 and the connecting pin 21. Additionally, since the vibration-proof member 22 is connected to/disconnected from the hinge member 18 by means of a screw member, the inexpensive general-purpose product generally put on sale can be used as the vibration-proof member 18. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to construction and construction such as a hydraulic excavator, and more particularly to a construction machine in which a floor member can be tilted with respect to a revolving frame.

  In general, a hydraulic excavator as a construction machine includes a small hydraulic excavator called a mini excavator. This small hydraulic excavator is provided with a self-propelled lower traveling body, an upper revolving body that is turnably mounted on the lower traveling body, and a front and rear front side of the upper revolving body that can be raised and lowered. And a working device.

  The upper swing body includes a swing frame forming a support structure, an engine mounted on the rear side of the swing frame, a floor member provided on the swing frame positioned on the front side of the engine, A driver's seat provided on the floor member, on which an operator sits, and a building such as a cab or a canopy that covers the driver's seat are roughly configured.

  Here, since a small excavator has a small upper swing body and a limited installation space, devices such as a control valve and a swing motor are disposed using the space below the floor member. . For this reason, in a small hydraulic excavator, by providing a floor support mechanism that supports the floor member in a tiltable manner with the front side position of the floor member as a fulcrum between the swing frame and the floor member, It is possible to perform inspection work and repair work on the equipment arranged in

  Further, the floor support mechanism includes a frame side bracket having a cylindrical portion that is attached to the revolving frame and penetrates in the left and right directions, and a floor side bracket that is provided on the floor member so as to sandwich the cylindrical portion of the bracket, A coupling pin that penetrates through the cylindrical portion of the bracket on the frame side and is supported by each bracket on the floor side at both ends, and is transmitted between the coupling pin and the cylindrical portion of the bracket on the frame side, and is transmitted from the revolving frame to the floor member (See, for example, Patent Document 1 and Patent Document 2).

JP 2005-119362 A JP 2008-303666 A

  In the hydraulic excavator according to each of the above-mentioned patent documents, since the vibration isolating rubber is inserted into the cylinder portion of the bracket on the frame side, the bracket and the vibration isolating rubber are manufactured exclusively, and the cylinder portion Dimensional accuracy must be increased by cutting the inner peripheral surface of the rubber and the outer peripheral surface of the anti-vibration rubber. For this reason, there is a problem that the manufacturing cost increases because it takes time to manufacture the bracket and the anti-vibration rubber.

  The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to simplify the configuration of the floor support mechanism and to manufacture it at low cost by using a vibration isolation member that is commercially available as a general-purpose product. It is to provide such a construction machine.

  A construction machine according to the present invention is provided with a self-propelled lower traveling body, an upper revolving body that is turnably mounted on the lower traveling body, and a front and rear front side of the upper revolving body that can be raised and lowered. The upper revolving structure comprises a revolving frame forming a support structure, a tilt floor provided on the revolving frame with a front seat as a fulcrum and having a driver's seat, and the tilt floor A floor support mechanism provided between the front side position of the swivel frame and the front side position of the tilt floor is provided to support the tiltable support.

  In order to solve the above-mentioned problem, the feature of the configuration adopted by the invention of claim 1 is that the floor support mechanism includes an upper bracket provided at a front position of the tilt floor and a left bracket with respect to the upper bracket. A hinge member formed by a lower bracket connected via a connecting pin extending in the right direction, and provided between the front side position of the swivel frame and the lower bracket located below the hinge member The anti-vibration member for suppressing the vibration between the turning frame and the tilt floor.

  The invention of claim 2 is that two floor support mechanisms are provided in the left and right directions at intervals.

  According to a third aspect of the present invention, the vibration isolating member includes a casing made of a bottomed cylindrical body having an upper opening, an elastic body that is elastically deformable provided in the casing so as to close the opening of the casing, A base end side is fixed to the elastic body, and a distal end side extends upward from the casing, and is configured to have an attachment shaft that is displaced upward and downward in accordance with the displacement of the elastic body. The tip end side of the mounting shaft of the vibration isolator is attached to the lower bracket.

  According to a fourth aspect of the present invention, a tool insertion hole for inserting a tool for attaching and removing the tip end side of the attachment shaft to the lower bracket is provided at the front side position of the tilt floor. .

  According to the first aspect of the present invention, the floor support mechanism includes a hinge member including an upper bracket, a lower bracket, and a connecting pin provided at a front position of the tilt floor, and a swivel frame positioned below the hinge member. The anti-vibration member is provided between the front position and the lower bracket and suppresses vibration between the turning frame and the tilt floor.

  Therefore, the hinge member can have a simple structure including the upper and lower brackets and the connecting pin. Further, since the vibration isolating member can be provided separately from the hinge member, an inexpensive general-purpose product can be used as the vibration isolating member.

  As a result, the configuration of the hinge member can be simplified, and the vibration isolation member can be made an inexpensive general-purpose product. Therefore, the configuration of the floor support mechanism can be simplified and manufactured at low cost. Moreover, since it is set as the structure which provides a vibration proof member under a hinge member, a floor support mechanism can be arrange | positioned in a small space.

  According to the second aspect of the present invention, since the two floor support mechanisms are provided at intervals in the left and right directions, the tilt floor can be stably supported, and workability and reliability can be improved. .

  According to the invention of claim 3, the vibration isolating member includes a casing attached to the revolving frame, an elastic body provided in the casing, a proximal end side fixed to the elastic body, and a distal end side extending upward from the casing. And a displaceable mounting shaft.

  Therefore, the tip end side of the attachment shaft of the vibration isolating member can be separably connected to the lower bracket of the hinge member. As a result, the hinge member and the vibration isolating member can be connected and disconnected by a simple attachment / detachment operation between the mounting shaft and the lower bracket, and productivity, maintenance workability, and the like can be improved. .

  According to invention of Claim 4, the tool penetration hole which penetrates a tool is formed in the front side position of a tilt floor. As a result, when attaching and detaching the tip end of the mounting shaft to the lower bracket, for example, a tool such as a socket wrench can be inserted through the tool insertion hole to the tip end of the mounting shaft. The properties and the like can be further improved.

1 is a front view showing a cab specification hydraulic excavator according to an embodiment of the present invention. It is a front view of the principal part expansion shown in the state which tilted up the cab shown in FIG. 1 by setting the front side position as a fulcrum. It is an external appearance perspective view which expands and shows a turning frame, a floor support mechanism, and a tilt floor. It is the external appearance perspective view which looked at the turning frame to which the vibration isolating member was attached from the same position as FIG. It is the external appearance perspective view which looked at the tilt floor from the lower right side. It is an external appearance perspective view of the principal part expansion which shows the left floor support mechanism with the left front part of a revolving frame, and the left front part of a tilt floor. It is the longitudinal cross-sectional view which looked at the floor support mechanism on the left side, the left front part of the turning frame, and the left front part of the tilt floor from the direction of arrows VII-VII in FIG. It is a disassembled perspective view which shows the left floor support mechanism, the left front part of the revolving frame, and the left front part of the tilt floor in an exploded state.

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

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

  On the other hand, the upper swing body 3 is roughly constituted by a swing frame 5, a tilt floor 9, a driver's seat 13, a cab box 16, a floor support mechanism 17 and the like which will be described later. Further, the upper swing body 3 can be tilted up (state shown in FIG. 2) and tilted down (state shown in FIGS. 1 and 3) with the tilt floor 9 together with the driver's seat 13 and the cab box 16 as a fulcrum. it can.

  Reference numeral 5 denotes a revolving frame constituting a support structure for the upper revolving structure 3. As shown in FIG. 4, the swivel frame 5 has a flat bottom plate 5A extending in the front and rear directions at the middle in the left and right directions, and spaced apart in the left and right directions on the upper surface side of the bottom plate 5A. A left vertical plate 5B and a right vertical plate 5C erected in a V shape, a support bracket 5D that is provided at the front end of each of the vertical plates 5B and 5C and supports the working device 4, and a front end of the bottom plate 5A The left side frame 5E extends from the left side to the left side and extends to the rear side, and the right side frame 5F extends from the front end portion of the bottom plate 5A to the right side and bends and extends to the rear side.

  Here, at the front side position of the revolving frame, the front beam 5G is located on the left side and extends left and right above the left side frame 5E, and the upper side of the support bracket 5D is positioned on the right side of the front beam 5G. A substantially triangular upper plate 5H extending on top of the left and right vertical plates 5B and 5C is provided. A vibration isolating member mounting hole 5J and a bolt insertion hole 5K (see FIG. 8) for mounting a vibration isolating member 22 to be described later with a space in the left and right directions are provided on the front beam 5G and the upper plate 5H which are the front positions of the revolving frame. Are formed).

  An engine 6 (illustrated by a dotted line in FIG. 1) is mounted on the revolving frame 5 on the rear side, and is positioned on the left front side, which is below the footrest 12 of the tilt floor 9 described later. A control valve is mounted, and a hydraulic oil tank and a fuel tank (both not shown) are mounted on the right side of the tilt floor 9.

  Reference numeral 7 denotes a counterweight located on the rear side of the engine 6 and attached to the rear end portion of the turning frame 5. This counterweight 7 balances the weight with the working device 4 and has a convex curved shape protruding rearward. The counterweight 7 is formed with a desired height and constitutes a support structure for mounting a floor mounting portion 11 of the tilt floor 9 described later.

  Reference numeral 8 denotes an exterior cover provided on the revolving frame 5 around the cab box 16. The exterior cover 8 covers devices such as the engine 6, the heat exchanger, the hydraulic oil tank, and the fuel tank mounted on the revolving frame 5.

  Reference numeral 9 denotes a tilt floor provided on the left side of the revolving frame 5. The tilt floor 9 is supported by a front beam 5G and an upper plate 5H whose front position is a front position of the revolving frame 5 via a floor support mechanism 17 described later, and a counterweight 7 whose rear position forms a support structure. It is supported by. Further, as shown in FIGS. 3 and 5, the tilt floor 9 includes a driver seat pedestal 10 that is positioned on the rear side and formed in a step shape, and a floor mounting portion that extends rearward from the rear portion of the driver seat pedestal 10. 11 and a footrest 12 located on the front side of the driver seat base 10 on which an operator puts his / her foot.

  A driver seat 15 described later is mounted on the driver seat base 10. Further, the floor mounting portion 11 is bolted to the upper portion of the counterweight 7 via a vibration isolating member (not shown) in a state where the tilt floor 9 is tilted down.

  Here, the front side of the footrest 12 that is the front side position of the tilt floor 9 is a lever / pedal mounting portion 12A. The lever / pedal mounting portion 12A is positioned approximately at the center in the left and right directions, and has a central mounting port 12A1 for mounting an operation lever / pedal 15 for travel, which will be described later, and the central mounting port 12A1. A left mounting port 12A2 and a right mounting port 12A3 are provided. In addition, a pedal, a spare pedal, and the like for swinging the work device 4 are attached to the attachment ports 12A2 and 12A3. On the other hand, an upper bracket 19 of a hinge member 18 to be described later is attached to the lower surface side of the lever / pedal attachment portion 12A with an interval in the left and right directions.

  Furthermore, a tool insertion hole 12B is formed in the lever / pedal mounting portion 12A located on the front side of the tilt floor 9. The tool insertion hole 12B is arranged at a position substantially coaxial with the left and right vibration isolation member mounting holes 5J when the tilt floor 9 is assembled on the revolving frame 5. The tool insertion hole 12B is a tool used when tightening or loosening a nut 31 that is screwed into a male screw portion 26A formed on a mounting shaft 26 of the vibration isolation member 22 to be described later, such as a socket wrench S (see FIG. 7 is inserted through a two-dot chain line). Thereby, the operation | work which tightens or loosens the nut 31, ie, the attachment of the tilt floor 9, the removal operation | work, etc. can be performed easily.

  Reference numeral 13 denotes a driver seat (see FIGS. 1 and 2) provided on a driver seat base 10 constituting the tilt floor 9, and the driver seat 13 is seated by an operator. Further, on the left and right sides of the driver's seat 13, operation levers 14 (only the left side are shown) for operating the work device 4 and the like are disposed. Further, the lever / pedal mounting portion 12A of the footrest 12 in front of the driver's seat 13 is provided with an operation lever / pedal 15 for traveling that is operated manually or by stepping when the lower traveling body 2 is traveled. ing.

  Reference numeral 16 denotes a cab box as a building provided on the tilt floor 9 so as to cover the periphery of the driver's seat 13. The cab box 16 covers the upper side and the periphery of the driver's seat 13 to form an operator's living space. The cab box 16 includes a front surface portion 16A, a rear surface portion 16B, a left side surface portion 16C, a right side surface portion (not shown), and a top surface portion 16D. A door 16E for entering and exiting is attached to the left side surface portion 16C so as to be opened and closed. Yes. The lower portion of the cab box 16 is bolted around the tilt floor 9.

  Here, the tilt floor 9, the driver's seat 13, the operation lever 14 for operation, the operation lever / pedal 15 for traveling, the cab box 16, and the like are configured as one unit mounted on the turning frame 5, and FIG. As shown in the above, it is possible to tilt upward and downward with a floor support mechanism 17 described later as a fulcrum.

  Next, the floor support mechanism 17 that supports the tilt floor 9 to be tiltable with respect to the revolving frame 5 will be described.

  5 to 8, reference numeral 17 denotes a left and right floor support mechanism provided between the front position of the revolving frame 5 and the front position of the tilt floor 9. Two left and right floor support mechanisms 17 are arranged at intervals in the left and right directions, for example, at both left and right ends of the tilt floor 9. The floor support mechanism 17 includes a hinge member 18 and a vibration isolation member 22 which will be described later.

  Reference numeral 18 denotes left and right hinge members provided on the tilt floor 9 side. As shown in FIGS. 5 and 6, the hinge member 18 is provided to face the upper bracket 19 provided on the lever / pedal mounting portion 12 </ b> A of the footrest 12 and the lower side of the upper bracket 19. The lower bracket 20 and a connecting pin 21 that rotatably connects the upper bracket 19 and the lower bracket 20 are configured.

  Here, the upper bracket 19 is composed of a vertical plate extending in the front and rear directions, and the upper portion thereof is integrally fixed to the lower position of the lever / pedal mounting portion 12A using welding means or the like. Further, the upper bracket 19 extends in parallel with each other as a pair of two spaced apart in the left and right directions with a distance dimension slightly larger than the left and right width dimensions of the lower bracket 20. As a result, each upper bracket 19 moves the lower bracket 20 leftward and rightward at the front position of the left and right mounting ports 12A2 and 12A3 of the lever / pedal mounting portion 12A located above a vibration isolating member 22 described later. From. Further, as shown in FIG. 8, the pair of upper brackets 19 are provided with pin insertion holes 19A that are located closer to the front side and penetrate in the left and right directions, and the pin insertion holes 19A are described later. The end portion of the connecting pin 21 to be supported is supported.

  On the other hand, the lower bracket 20 includes a rectangular horizontal plate portion 20A facing the lever / pedal mounting portion 12A, and a substantially triangular vertical plate portion 20B erected on the left and right sides of the horizontal plate portion 20A. It is comprised by. In addition, a vibration isolating member connection hole 20C is provided in substantially the center of the horizontal plate portion 20A so as to penetrate upward and downward, and the vibration isolating member connection hole 20C is provided with a vibration isolating member 22 described later. The male screw portion 26A of the shaft 26 is inserted. Each vertical plate portion 20B is coaxially formed with a pin insertion hole 20D that is positioned on the raised front side and through which the connecting pin 21 is rotatably inserted. In this case, as shown in FIG. 7, the pin insertion hole 20D does not interfere with the socket wrench S when a nut 31 described later is screwed into the male thread portion 26A of the mounting shaft 26 inserted into the vibration isolating member connection hole 20C. As described above, the anti-vibration member connection holes 20C are arranged to be shifted to the front side.

  Furthermore, the connection pin 21 arrange | positions each vertical board part 20B of the lower bracket 20 between the left and right upper brackets 19, and is inserted in the pin insertion hole 19A and the pin insertion hole 20D in this state, Each bracket 19 and 20 is rotatably supported. As described above, the hinge member 18 can have a simple configuration in which the lower bracket 20 is disposed between the two upper brackets 19 made of a plate and is connected by the connecting pin 21.

  Reference numeral 22 denotes a vibration isolating member that constitutes the floor support mechanism 17 together with the hinge member 18, and the vibration isolating member 22 is located below the hinge member 18 between the front side position of the revolving frame 5 and the lower bracket 20. It is provided mainly on the front beam 5G and the upper plate 5H which are the front side position of the revolving frame 5, respectively. The vibration isolation member 22 prevents the vibration of the turning frame 5 from being transmitted to the tilt floor 9.

  Here, the vibration isolator 22 according to the present embodiment is configured to attach and remove the distal end side of a mounting shaft 26 described later to the lower bracket 20 using a nut 31 described later. It can be connected to or separated from the hinge member 18 simply by loosening or tightening. Thereby, since the vibration isolator 22 does not require a special mounting structure, an inexpensive general-purpose product that is generally commercially available can be used as the vibration isolator 22. In this case, the vibration isolating member 22 is selected from a variety of commercially available anti-vibration members that meet conditions such as the spring constant and the mounting structure. In this embodiment, for example, a liquid-sealed type is used. Anti-vibration members are used. Further, as shown in FIGS. 7 and 8, the vibration isolation member 22 includes a casing 23, an elastic body 25, a mounting shaft 26, a viscous liquid 28, a movable cylinder 29, and the like which will be described later.

  Reference numeral 23 denotes a casing that forms the outer shape of the vibration isolating member 22. The casing 23 is formed as a bottomed cylindrical body that opens upward, and a fixing flange portion 23A is provided on the opening side. Further, the casing 23 is inserted from below into the vibration isolating member mounting hole 5J provided in the front beam 5G and the upper plate 5H of the revolving frame 5, and the bolt 24 inserted into the bolt insertion hole 5K is screwed into the flange portion 23A. By attaching it, it is attached to the front beam 5G and the upper plate 5H.

  Reference numeral 25 denotes an elastically deformable elastic body provided in the casing 23 so as to close the opening of the casing 23, and the elastic body 25 encloses a viscous liquid 28 described later in the casing 23. Here, the elastic body 25 is formed of an elastic material such as rubber, for example, and a base end side of a mounting shaft 26 to be described later is integrally fixed to a central portion thereof.

  Reference numeral 26 denotes an attachment shaft provided on the opening side of the casing 23, and the attachment shaft 26 is displaced upward and downward in accordance with the displacement of the elastic body 25. The attachment shaft 26 is integrally fixed to the central portion of the elastic body 25 at the proximal end extending in the upward and downward directions. On the other hand, the distal end side of the mounting shaft 26 extends upward from the elastic body 25 to form a male screw portion 26A.

  Reference numeral 27 denotes a fluid chamber defined in the casing 23, and the fluid chamber 27 is configured as a sealed space surrounded by the casing 23, the elastic body 25, and the mounting shaft 26. In the fluid chamber 27, for example, a viscous liquid 28 having a large viscosity such as silicon oil is enclosed.

  A movable cylinder 29 is located in the fluid chamber 27 and attached to the lower end portion of the attachment shaft 26, and the movable cylinder 29 generates a damping force with respect to the displacement of the attachment shaft 26. In addition, the movable cylinder 29 is formed in a covered cylindrical shape that is slightly smaller than the inner diameter of the fluid chamber 27. The movable cylinder 29 is always immersed in the viscous liquid 28 sealed in the fluid chamber 27. When the elastic body 25 is elastically deformed, the movable cylinder 29 is moved upward and downward (axial direction) in the viscous liquid 28 together with the mounting shaft 26. ).

  Reference numeral 30 denotes an annular passage formed between the casing 23 and the movable cylinder 29. The annular passage 30 extends in the axial direction as an annular gap formed over the entire circumference between the inner peripheral surface of the elastic body 25 fixed in the casing 23 and the outer peripheral surface of the movable cylinder 29. . Thus, the annular passage 30 generates a resistance force at this time as the movable cylinder 29 moves upward and downward in the viscous liquid 28 and the viscous liquid 28 circulates.

  Reference numeral 31 denotes a nut for attaching the hinge member 18 to the vibration isolation member 22. The nut 31 is screwed into the male screw portion 26A protruding from the vibration isolating member connection hole 20C in a state where the male screw portion 26A of the mounting shaft 26 is inserted into the vibration isolating member connection hole 20C of the lower bracket 20. The attachment shaft 26 and the lower bracket 20 are integrally connected.

  Reference numeral 32 denotes a gas spring that urges the tilt floor 9 in the tilt-up direction. Here, as means for biasing the tilt floor 9 in the tilt-up direction, for example, biasing means such as a screw mechanism, a hydraulic cylinder, and a coil spring may be used in addition to the gas spring 32 described above.

  The hydraulic excavator 1 according to the present embodiment has the above-described configuration. Next, an operation for mounting the tilt floor 9 on the revolving frame 5 will be described.

  First, on the revolving frame 5 side, the casing 23 of the vibration isolating member 22 is inserted into the anti-vibration member mounting hole 5J provided on the front beam 5G and the upper plate 5H of the revolving frame 5 from below, and the flange portion 23A is bolted. 24 is fixed to the front beam 5G and the upper plate 5H. As a result, the two vibration isolating members 22 can be disposed at the front position of the revolving frame 5 with an interval in the left and right directions.

  On the other hand, on the tilt floor 9 side, the vertical plate portions 20B of the lower bracket 20 are arranged between the left and right upper brackets 19 provided on the front lever / pedal mounting portion 12A, and in this state, both pins are inserted. The brackets 19 and 20 can be rotatably connected by inserting the connecting pin 21 into the hole 19A and the pin insertion hole 20D. As described above, the hinge member 18 can be easily assembled simply by disposing the lower bracket 20 between the two upper brackets 19 made of a plate and connecting them by the connecting pins 21.

  When the vibration isolator 22 is attached to the revolving frame 5 side and the hinge member 18 is assembled on the tilt floor 9 side, the tilt floor 9 is placed on the revolving frame 5 so that the hinge member 18 is positioned directly above the anti-vibration member 22. And the tilt floor 9 is brought close to the revolving frame 5. At this time, the male threaded portion 26A of the mounting shaft 26 constituting the vibration isolating member 22 is inserted into the vibration isolating member connecting hole 20C of the lower bracket 20, and the nut 31 is inserted into the male threaded portion 26A protruding from the vibration isolating member connecting hole 20C. Screw together. When the nut 31 is screwed into the male thread portion 26 </ b> A, the socket wrench S is inserted into the tool insertion hole 12 </ b> B provided in the lever / pedal attachment portion 12 </ b> A, and the socket wrench S is engaged with the nut 31. As a result, the operator can tighten the nut 31 with the socket wrench S, and can attach the hinge member 18 to the vibration isolation member 22.

  Next, the operation of the hydraulic excavator 1 will be described. First, the operator can make the lower traveling body 2 travel by sitting on the driver's seat 13 and operating the operating lever / pedal 15 for traveling. Further, by operating the operation lever 14 for work, the work device 4 can be moved up and down to perform excavation work of earth and sand.

  Here, vibration is generated during traveling and working of the hydraulic excavator 1, and this vibration is transmitted from the turning frame 5 to the tilt floor 9. At this time, the vibration isolation member 22 provided on the revolving frame 5 suppresses vibration transmitted from the revolving frame 5 to the tilt floor 9 by displacing the mounting shaft 26 with respect to the casing 23 while elastically deforming the elastic body 25. be able to. When the mounting shaft 26 is displaced, the movable cylinder 29 fixed to the mounting shaft 26 moves upward and downward in the viscous liquid 28. Thereby, the vibration can be damped by utilizing the large viscosity of the viscous liquid 28.

  Next, a case where maintenance work is performed on the excavator 1 will be described. The engine 6, control valve, and the like that are the objects of this maintenance work are disposed below the tilt floor 9. For this reason, it is necessary to tilt up the tilt floor 9 together with the cab box 16 and the like as shown in FIG.

  Therefore, an operation for tilting up the tilt floor 9 together with the driver's seat 13, the cab box 16 and the like will be described. First, the bolts and the like that attach the floor attaching portion 11 of the tilt floor 9 to the counterweight 7 of the turning frame 5 are removed. As a result, the tilt floor 9 is tilted up by the biasing force of the gas spring 32 with the two hinge members 18 (the connecting pins 21) provided at the front position spaced apart to the left and right as fulcrums. Therefore, maintenance work for the engine 6 and the control valve can be performed.

  Thus, according to the present embodiment, the floor support mechanism 17 is provided with the hinge member 18 including the upper bracket 19, the lower bracket 20 and the connecting pin 21 provided at the front side position of the tilt floor 9, and the lower part of the hinge member 18. The anti-vibration member 22 is provided between the front position of the revolving frame 5 and the lower bracket 20 and suppresses vibration between the revolving frame 5 and the tilt floor 9.

  Therefore, the hinge member 18 can have a simple configuration with a small number of parts including the upper bracket 19, the lower bracket 20 and the connecting pin 21. Further, the vibration isolator 22 is not a special mounting structure, and can be connected to and separated from the hinge member 18 only by attaching and detaching the nut 31, for example. Therefore, an inexpensive general-purpose product that is generally commercially available as the vibration isolator 22 is used. be able to.

  As a result, the configuration of the hinge member 18 can be simplified, and the vibration isolation member 22 can be an inexpensive general-purpose product. Therefore, the configuration of the floor support mechanism 17 can be simplified and manufactured at low cost. Further, since the vibration isolation member 22 is provided below the hinge member 18, the floor support mechanism 17 can be disposed in a small space.

  In addition, since the two floor support mechanisms 17 are provided at intervals in the left and right directions, the tilt floor 9 can be stably supported, and can be stably supported even in a tilted state. Thereby, the workability | operativity at the time of excavation work and a maintenance work and the reliability with respect to the hydraulic shovel 1 can be improved.

  On the other hand, an anti-vibration member connection hole 20C is provided through the horizontal plate portion 20A of the lower bracket 20 of the hinge member 18 so as to penetrate upward and downward, and the mounting shaft 26 of the anti-vibration member 22 has a tip side extending upward. The male screw portion 26A is formed, and the nut 31 is screwed into the male screw portion 26A. Accordingly, the male screw portion 26A formed on the mounting shaft 26 of the vibration isolating member 22 passes through the vibration isolating member connection hole 20C of the lower bracket 20, and the nut 31 is screwed to the protruding portion to thereby attach the nut 31 to the vibration isolating member 22. On the other hand, the lower bracket 20 can be detachably connected. Thereby, the hinge member 18 and the vibration isolating member 22 can be connected and disconnected by a simple operation of attaching and detaching the nut 31, and productivity, maintenance workability, and the like can be improved.

  Furthermore, a tool insertion hole 12B through which a socket wrench S for turning the nut 31 is inserted is formed in the lever / pedal mounting portion 12A of the footrest 12 of the tilt floor 9. As a result, when the nut 31 is tightened or loosened, the socket wrench S can be easily engaged with the nut 31 via the tool insertion hole 12B, and productivity, maintenance workability, and the like are further improved. Can do.

  In the embodiment, a case where the vibration isolation member 22 is configured as a liquid-filled vibration isolation member including the casing 23, the elastic body 25, the mounting shaft 26, the viscous liquid 28, the movable cylinder 29, and the like is illustrated. Yes. However, the present invention is not limited to this, and another vibration isolation member may be applied. For example, a vibration isolating member that relieves vibration only by an elastic body such as rubber, or a vibration isolating member that is separately provided with a coil spring or the like as an urging means may be applied.

  In the embodiment, the cab type hydraulic excavator 1 including the cab box 16 covering the periphery and the upper side of the driver's seat 13 as a construction machine has been described as an example. However, the present invention is not limited to this. For example, the present invention may be applied to a canopy-type hydraulic excavator provided with a canopy that covers the upper side of the driver's seat with a plurality of pillars and a roof.

  Furthermore, in the embodiment, the crawler type hydraulic excavator has been described as an example of the construction machine. However, the present invention is not limited to this, and may be applied to other construction machines such as a wheel type hydraulic excavator and a hydraulic crane. can do.

1 Excavator (construction machine)
2 Lower traveling body 3 Upper revolving body 4 Working device 5 Revolving frame 5G Front beam (front position)
5H Upper plate (front position)
9 Tilt floor 10 Driver's seat base 11 Floor mounting part 12 Footrest 12A Lever / pedal mounting part (front position)
12B Tool insertion hole 13 Driver's seat 17 Floor support mechanism 18 Hinge member 19 Upper bracket 20 Lower bracket 20C Anti-vibration member connection hole 21 Connection pin 22 Anti-vibration member 23 Casing 25 Elastic body 26 Mounting shaft 26A Male thread part 31 Nut S Socket wrench (tool)

Claims (4)

A self-propelled lower traveling body, an upper revolving body mounted on the lower traveling body so as to be able to swivel, and a working device provided so as to be able to move up and down in front of the upper revolving body and in front of the rear direction. ,
In order to support the tilt floor in a tiltable manner, the upper swing body includes a swing frame that forms a support structure, a tilt floor that is tiltably provided on the swing frame with the front side as a fulcrum, and has a driver's seat. In a construction machine comprising a floor support mechanism provided between a front position of the swivel frame and a front position of the tilt floor,
The floor support mechanism includes a hinge member formed from an upper bracket provided at a front position of the tilt floor and a lower bracket connected to the upper bracket via a connecting pin extending in the left and right directions; The anti-vibration member is provided on the lower side of the hinge member and provided between the front position of the revolving frame and the lower bracket, and suppresses vibration between the revolving frame and the tilt floor. And construction machinery.   The construction machine according to claim 1, wherein two floor support mechanisms are provided in the left and right directions at intervals. The vibration isolating member includes a casing formed of a bottomed cylindrical body having an upper opening, an elastic body that is elastically deformable provided in the casing so as to close the opening of the casing, and a base end side of the elastic body. A fixing shaft that extends upward from the casing and is displaced upward and downward in accordance with the displacement of the elastic body;
The construction machine according to claim 1 or 2, wherein a casing of the vibration isolation member is attached to the revolving frame, and a tip end side of an attachment shaft of the vibration isolation member is attached to the lower bracket.   The construction machine according to claim 3, wherein a tool insertion hole for inserting a tool for attaching and detaching the tip end side of the attachment shaft to the lower bracket is provided at a front side position of the tilt floor.

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