JP4299163B2 - Construction machinery - Google Patents

Description

  The present invention relates to construction of, for example, a hydraulic excavator, a hydraulic crane, and the like, and in particular, a driver's seat is tilted up and down together with a floor plate with respect to a frame so that maintenance work and the like on the lower side of the floor can be easily performed. It relates to the construction machine.

  In general, a hydraulic excavator as a construction machine 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-rear side of the upper revolving body that can be raised and lowered. And a work device.

  Further, the upper swing body includes a swing frame, an engine mounted on the rear side of the swing frame, a counterweight located on the rear side of the engine and attached to a rear end portion of the swing frame, and the engine A flat floor board provided on the revolving frame located on the front side of the vehicle, a driver seat provided on the floor board on which an operator is seated, and a building such as a canopy or a cab that covers the upper side of the driver seat. It is configured.

  Here, the hydraulic excavator includes a small excavator called a mini excavator suitable for excavation work in a narrow work site. Further, in such a small hydraulic excavator, for example, a space for installing hydraulic equipment such as a control valve and a swing motor is secured below the floor plate in order to make the swing frame as small as possible.

  When performing maintenance work on equipment such as control valves and swing motors installed under the floorboard, the floorboard is tilted up and down so that the rear side is lifted upward with the front side position of the floorboard as a fulcrum. The thing made into the structure made to do is known (for example, refer patent document 1).

  In this case, a floor plate support mechanism is provided between the front side position of the swivel frame and the front side position of the floor plate so that the floor plate can be tilted forward and backward together with the driver's seat etc. with the front side position of the floor plate as a fulcrum. Is provided. In addition, a gas damper made of a gas spring or the like is provided below the floor plate with the revolving frame, and the floor plate is tilted forward with the floor plate support mechanism as a fulcrum by the urging force of the gas damper.

JP 2000-72048 A

  By the way, in the hydraulic excavator by the prior art mentioned above, it is set as the structure which tilts a floor board up and down with the urging | biasing force of the gas damper provided in the lower side of the floor board. However, on the floor board, for example, a canopy that covers the driver's seat from the upper side, or a cab that defines the driver's cab inside is mounted with an air conditioner etc., so the weight of the floor board is heavy. In order to lift the floor board against a heavy weight, for example, it is necessary to provide two to four or more gas dampers.

  However, when two to four gas dampers are installed on the lower side of the floor plate, even if the floor plate is tilted to lift upward during maintenance work, the hand is not extended to the maintenance point located on the lower side of the floor plate. When trying to do so, any one of the plurality of gas dampers becomes an obstacle, making it difficult to secure a work space, and there is a problem that workability during maintenance is lowered.

  Further, since the gas damper in this case is limited to a size that fits below the floor board, the maximum extension (stroke) dimension cannot be increased, and it is difficult to lift and tilt the floor board sufficiently large. . In addition, if the installation position of the gas damper is brought closer to the tilting fulcrum of the floor board in order to lift and tilt the floor board greatly, a large load will be applied to the gas damper, increasing the size of the gas damper and increasing the number of installations. Etc. are required.

  On the other hand, a gas damper consisting of a gas spring, etc., always exerts an urging force in the direction to lift the floor plate, so when the lock is released to tilt the floor plate, the gas damper expands rapidly from the contracted state to the fully extended state. There is a tendency to end up. For this reason, when the lock is released in order to tilt the floor board, the floor board suddenly rises. On the other hand, when the floor plate is pushed down against the urging force of the gas damper, a large force is required, and there is a problem that its operability and handling are poor.

  Furthermore, when the gas damper is deteriorated due to deterioration of a sealing member for ensuring airtightness, the gas damper may not be able to keep the floor plate tilted upward. In order to maintain this tilted state, it is necessary to separately provide a stopper or the like between the swivel frame and the floor board. This increases the number of parts, and extra work is required for the assembling work. There is a problem.

  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 secure a large space between the frame and the frame when the floor plate is tilted. An object of the present invention is to provide a construction machine that can easily perform maintenance work, protect a tilting mechanism from external wind and rain, dust, and the like, and improve durability, life, and reliability.

  Another object of the present invention is to protect the screw shaft of the tilting mechanism from external wind and rain, dust, etc., and to prevent problems such as rusting on the screw shaft and to improve the appearance of the appearance. It is to provide a construction machine that can improve and enhance the product value.

  In order to solve the above-mentioned problems, the present invention is provided on a frame on which a working device is provided on the front side, an engine mounted on the rear side of the frame, and positioned on the front side of the engine. The present invention is applied to a construction machine including a floor board and a driver seat provided on the floor board and seated by an operator.

The feature of the configuration adopted by the invention of claim 1 is provided between the front side position of the frame and the front side position of the floor board, and the floor board is tilted together with the driver's seat with the front side position of the floor board as a fulcrum. A floor plate support mechanism that is rotatably supported, and is provided between the frame and the floor plate at a rear side of the floor plate support mechanism, with the frame side as a rotation fulcrum and the floor plate side as a movement fulcrum. In order to tilt the floor plate to the front side according to the displacement amount of the moving fulcrum by moving the moving fulcrum to an arbitrary position , the base end side is rotatably attached to the frame side and the distal end side becomes a free end. A guide rail extending to the front side, a screw shaft extending in the length direction of the guide rail and rotatably provided to the guide rail, and rotatably attached to the floor plate side and screwed to the screw shaft In the state And a tilting mechanism comprising a moving member which moves in the longitudinal direction of the guide rail is, in order to protect the inclined rolling mechanism from the outside, and a cover as a protection member for covering the screw shaft from the outside of the guide rail It is that it was set as the structure provided with.

Further, according to the invention of claim 2, wherein the cover, the cover in conjunction with the tilting operation of the floor plate is configured to open and close.

  As described above, according to the first aspect of the present invention, when the movement fulcrum of the tilting mechanism is disposed at a position close to the rotation fulcrum, the floor board is placed on the frame and the machine is operated. be able to. In addition, the tilting mechanism displaces the moving fulcrum in a direction away from the pivoting fulcrum, so that the floor board can be tilted forward according to the amount of displacement of the moving fulcrum, and the floor board is opened upward. Thus, it is possible to maintain machinery such as an engine disposed below the floor. At this time, the tilting mechanism is configured to stop the displacement of the moving fulcrum at an arbitrary position, so that the tilting amount of the floor board can be freely adjusted and workability during maintenance can be improved. In addition, since the tilting mechanism is protected by the protective member, it is possible to prevent external wind and rain, dust, etc. from entering the tilting mechanism, and to improve the durability and life of the tilting mechanism. , Can increase the reliability.

On the other hand, according to the first aspect of the present invention, the tilt mechanism rotates the screw shaft provided on the guide rail on the frame side so that the moving member screwed to the screw shaft is elongated along the guide rail. Since it is configured to move in the vertical direction, it can be tilted so that the floor plate side opens upward from the frame according to the amount of displacement of the moving member. At this time, the guide rail is tilted with respect to the frame. It can be made to function as a support column that is supported in a state.

  The tilt mechanism can be configured as an elongated rod-like body in which a screw shaft and a moving member are housed in a guide rail. For example, only one tilt mechanism can be used to sufficiently support the weight on the floor plate side from below. Therefore, even if compared with the gas dampers described in the prior art, the number of use can be reduced, and the support strength can be surely increased, and a work space for maintenance can be easily secured between the frame and the floor board. it can. The maintenance worker can easily insert the hand into the work place using the work space between the frame and the floorboard, so that the maintenance work can be performed efficiently, and the workability and safety are improved. Etc. can be improved.

  Further, since the tilting mechanism tilts the floor board using the screwing of the screw shaft and the moving member, it is possible to increase the moving stroke of the moving member, and thereby the floor board is largely tilted upward. It is possible to secure a large working space between the frame and the floor board. And since the tilting mechanism using the screwing of the screw shaft and the moving member does not always generate an urging force unlike the gas damper, the floorboard does not tilt suddenly, and the floorboard The floor plate can be tilted easily and safely without requiring a large force to push down. Furthermore, since the floor plate is tilted by screwing the screw shaft and the moving member, the floor plate can be easily fixed in a state where the floor plate is tilted to an arbitrary position, and a stopper is provided between the frame and the floor plate. Etc., and the number of parts can be reduced to improve workability during assembly.

  In addition, since the screw shaft of the tilting mechanism is covered from the outside of the guide rail by using a cover as a protective member, the screw shaft of the tilting mechanism can be protected from external wind and rain, dust, etc. by the cover. It is possible to suppress the occurrence of rust on the thread surface and the like, improve the appearance of the external shape and the like, and increase the commercial value of the tilt mechanism and the like.

Further, according to the invention described in claim 2, since the cover is the cover in conjunction with the tilting operation of the floorboards are configured to open and close, for example, the driving operation of the construction machine is placed a floor plate on a frame or the like When performing maintenance work, the tilt mechanism can be covered with a cover to protect it from the outside. When performing a maintenance work by tilting the floor plate upward from the frame, the cover is opened and the tilt mechanism is exposed to the outside. Can be made. For this reason, when carrying out maintenance work under the floor, the inside of the tilting mechanism can be looked into. For example, lubrication is applied to the screw shaft of the tilting mechanism, and maintenance and inspection work can be easily performed. .

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

  Here, FIG. 1 to FIG. 11 show a first embodiment of the present invention. In the figure, 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 swing mounted on the lower traveling body 2 so as to be capable of pivoting. The body 3 is constituted.

  As shown in FIG. 1, a swing post type working device 4 for excavating earth and sand is swingable left and right, and lifted up and down on the front side of the upper swing body 3. It is provided as possible. Further, the upper turning body 3 is formed in a substantially circular shape when viewed from above so that it can turn substantially within the vehicle width of the lower traveling body 2 (see FIG. 2). The upper swing body 3 includes a swing frame 5, an engine 6, a floor plate 15, a floor plate support mechanism 21, a driver seat 26, a cab 29, a tilt mechanism 30, and the like which will be described later.

  Reference numeral 5 denotes a revolving frame constituting a base frame of the upper revolving structure 3, and the revolving frame 5 is a flat bottom plate extending forward and rearward in the left and right intermediate portions as shown in FIGS. 5A, a pair of vertical plates 5B and 5B provided on the upper surface side of the bottom plate 5A so as to be separated from each other left and right, and a support bracket that is provided at the front end of each vertical plate 5B and supports the working device 4 5C and the like.

  The revolving frame 5 includes a front beam 5D that is positioned on the front side and extends left and right, a middle beam 5E that extends left and right at the rear position of each vertical plate 5B, and the front beam 5D. And an under cover 5F provided between the intermediate beam 5E, and a mounting seat 5G for mounting a floor plate support mechanism 21 to be described later is provided in the vicinity of the rear side of the support bracket 5C.

  Reference numeral 6 denotes an engine mounted on the rear side of the revolving frame 5, and the engine 6 is installed in a lateral state on the rear side of the bottom plate 5 </ b> A as shown in FIG. 3 and extends in the left and right directions of the revolving frame 5. It is what you do. The engine 6 is disposed so that the upper side thereof is covered by a partition plate 17 or the like of a floor plate 15 described later and enters the lower side of the partition plate 17. Thus, the engine 6 can be installed in the front side together with a counterweight 13 and the like which will be described later, and the upper revolving unit 3 can be reduced in size by effectively using the installation space of the entire revolving frame 5.

  Here, as shown in FIG. 3, a hydraulic pump 7 driven by the engine 6 is provided on the left side of the engine 6, and a heat exchanger 8 such as a radiator and an oil cooler is provided on the right side of the engine 6. . Further, a hydraulic oil tank 9 is provided on the right side of the swivel frame 5 at the front side of the heat exchanger 8, and a fuel tank 10 is provided on the front side of the hydraulic oil tank 9.

  A control valve 11 is provided on the under cover 5F on the left side of the revolving frame 5. The control valve 11 is a multiple valve including a plurality of directional control valves. It is located on the under cover 5F of the revolving frame 5 and so on (under the floor).

  The control valve 11 supplies and discharges the pressure oil discharged from the hydraulic pump 7 to hydraulic actuators such as the cylinders of the working device 4, the turning hydraulic motor, and the traveling hydraulic motor (all not shown). In some cases, the flow rate and the supply / discharge direction of the pressure oil supplied and discharged individually for each hydraulic actuator are controlled.

  A support member 12 is provided on the rear side of the revolving frame 5 so as to straddle the engine 6 from above. The support member 12 constitutes a part of the revolving frame 5, and a cab 29 described later is attached to the partition plate 17 of the floor plate 15. In addition, it is supported from below. As shown in FIGS. 3 and 4, the support member 12 is positioned above the engine 6 and extends in the left and right directions, and a support base on which the partition plate 17 of the floor plate 15 is attached via a building attachment plate 18 described later. 12A and a plurality of (for example, four) support columns 12B, 12C, 12D, and 12E that support the support base 12A at a position above the engine 6 are roughly configured.

  Further, among the columns 12B, 12C, 12D, and 12E, the left front column 12B extends forward and downward from the left end of the support base 12A, and the left rear column 12C extends downward from the left end of the support base 12A. Further, the right front column 12D extends downward from the right end portion of the support base 12A, and the right rear column 12E extends downward from the right end portion of the support base 12A. And the lower end part of each support | pillar 12B, 12C, 12D, 12E is being fixed and attached to the turning frame 5, respectively.

  Here, the right front column 12D is provided on the right side of a floor plate 15 described later, and is bent in a substantially L shape so as not to block the heat exchanger 8. Further, the middle portion in the length direction of the right front column 12D is an inclined surface portion 12D1 inclined forward, and a guide rail 33 constituting an inclination mechanism 30 described later is provided with a mounting bracket 31 shown in FIG. 5 on the inclined surface portion 12D1. It is attached via.

  Reference numeral 13 denotes a counterweight (see FIGS. 1 and 2) that is located on the rear side of the engine 6 and is attached to the rear end of the revolving frame 5. The counterweight 13 balances the weight of the working device 4. Thus, it has a convex curved shape and extends in an arc shape in the left and right directions.

  Here, the counterweight 13 can be formed in a small size at the rear end of the revolving frame 5 by disposing the engine 6 in the front side so as to enter the lower side of the partition plate 17 of the floor plate 15. Thereby, the counterweight 13 is accommodated in the turning radius corresponding to the vehicle width of the lower traveling body 2.

  An exterior cover 14 is provided so as to cover the rear side of a cab 29, which will be described later, from the surroundings. The exterior cover 14 includes a rear side of the engine 6 installed on the revolving frame 5, a heat exchanger 8, a hydraulic oil tank. 9. The fuel tank 10 and the counterweight 13 are covered from above.

  As shown in FIGS. 1 and 2, the exterior cover 14 includes a left side cover 14 </ b> A that smoothly continues from the left end side of the counterweight 13 toward the front, and smoothly from the right end side of the counterweight 13 toward the front. The right side cover 14B is continuous, and the engine cover 14C is provided on the rear side of the cab 29 so as to be openable and closable between the left side cover and the right side cover 14B.

  As shown in FIGS. 1 and 2, the exterior cover 14 is provided with a tank cover 14 </ b> D that is located on the right side of the cab 29 and covers the hydraulic oil tank 9, the fuel tank 10, and the like from above. The tank cover 14 </ b> D is disposed with a gap between the tank cover 14 </ b> D and the cab 29 in order to attach a tilting mechanism 30 to be described later. In FIGS. 5 and 6, the exterior cover 14 and the like are shown in a removed state to clearly show a tilt mechanism 30 and the like which will be described later.

  A floor plate 15 is provided on the revolving frame 5 so as to be openable and closable. The floor plate 15 extends left and right on the revolving frame 5 so as to cover the vertical plates 5B and 5B of the revolving frame 5 and the control valve 11 from above. It is provided to be offset to one side (left side when viewed from the rear of the vehicle).

  As shown in FIG. 8, the floor plate 15 is provided so as to rise upward from the rear end of the footrest plate 16 and a footrest plate 16 that serves as a footrest for an operator seated in a driver seat 26 described later. A partition plate 17 that partially covers the engine 6, a building mounting plate 18 provided at the upper end of the partition plate 17, and a side plate 19 that rises from the right side position of the footrest plate 16 are roughly configured. Yes.

  Here, the front portion of the footrest plate 16 serves as a lever / pedal mounting portion 16A for mounting a travel operation lever / pedal 28, which will be described later, and a floor plate support mechanism 21, which will be described later, on the front side of the lever / pedal mounting portion 16A. Is provided. Further, the partition plate 17 constituting the rear side of the floor plate 15 is provided to extend rearward so as to cover the engine 6 from the upper side after rising from the rear side of the footrest plate 16. It arrange | positions so that the lower side of the board 17 may be entered.

  As shown in FIG. 8, the partition plate 17 includes a rising wall 17A that rises upward from the rear end of the footrest plate 16, and a driver seat support base 17B that extends rearward from the upper end of the rising wall 17A. A back plate portion 17C extending upward from the rear end of the driver seat support base 17B, and an instrument mounting portion 17D located on one side (right side as viewed from the rear of the vehicle) of the driver seat support base 17B and the back plate portion 17C. And is formed by. In this case, a driver's seat 26 described later is mounted on the driver's seat support base 17B, and instruments (not shown) such as switches and monitors are attached to the instrument attachment portion 17D.

  As shown in FIG. 8, the building mounting plate 18 is provided to extend in the left and right directions. The building mounting plate 18 has a plurality of mounting holes 18A, 18A,. Is provided. Of these mounting holes 18A, for example, bolts (not shown) for mounting the rear side of the cab 29 constituting the building are inserted into the mounting holes 18A located on both the left and right sides. Further, other bolts are inserted into the remaining mounting holes 18A when the building mounting plate 18 is mounted on the support base 12A of the support member 12, and the floor plate 15 is tilted as shown in FIG. 6 by removing these bolts. It becomes possible to up.

  On the other hand, the side plate 19 of the floor plate 15 is formed as a substantially rectangular plate body that rises from the right rear portion of the footrest plate 16 along the instrument mounting portion 17D of the partition plate 17. And the side plate 19 is arrange | positioned in the position of the notch part 29B so that it may become substantially flush | planar with the side part 29A of the cab 29 mentioned later. Thereby, the side plate 19 is exposed to the outside together with the side surface portion 29 </ b> A of the cab 29, and constitutes a connecting portion on the floor plate 15 (cab 29) side with respect to the tilt mechanism 30 described later.

  In this case, the floor plate 15 has a side plate 19 joined to the footrest plate 16 and the instrument mounting portion 17D with sufficient strength to support the driver's seat 26, the cab 29 and the like from below. Further, as shown in FIGS. 8 to 10, a sleeve 20 described later is attached to the upper side of the side plate 19 with sufficient strength.

  Reference numeral 20 denotes a sleeve that is joined to the upper side of the side plate 19, and the sleeve 20 is a cylindrical body into which a moving member 35 of a tilting mechanism 30 described later is rotatably inserted as shown in FIG. Is formed. The sleeve 20 is attached to the side plate 19 by means of welding or the like as shown in FIGS. 8 and 9, and is arranged to extend in the left and right directions of the floor plate 15.

  Reference numeral 21 denotes a floor plate support mechanism for supporting the floor plate 15 on the front side of the revolving frame 5, and the floor plate support mechanism 21 is located on the front side of the revolving frame 5 and the front side of the floor plate 15 (footrest plate 16) as shown in FIGS. The floor plate 15 is tiltably supported so as to allow the floor plate 15 to be opened and closed in the directions of arrows A and B in FIG.

  The floorboard support mechanism 21 corresponds to the front beam 5D provided at the front position of the revolving frame 5 and the two mounting brackets 22 attached to the mounting seat 5G as shown in FIG. Left and right mounting pieces 23 provided at the front side position of the footrest plate 16 as described above, and anti-vibration rubber (not shown) provided between the mounting bracket 22 and the mounting pieces 23, The mounting bracket 22 and the mounting piece 23 are connected to each other via a vibration isolating rubber so as to be tiltably connected.

  The connecting pin 24 of the floor board support mechanism 21 extends, for example, in the left and right directions of the floor board 15 and connects the front position of the floor board 15 to the front position of the revolving frame 5 so as to be tiltable. Accordingly, when the floor board 15 is tilted up, the floor board 15 is tilted forward (in the direction of arrow A) with the connecting pin 24 of the floor board support mechanism 21 as a fulcrum, as shown in FIG. Is lifted up.

  Further, when the floor plate 15 is tilted down as shown in FIG. 5, the rear side of the floor plate 15 is tilted backward (in the direction of arrow B), and the building mounting plate 18 of the floor plate 15 is placed on the support base 12 </ b> A of the support member 12. Is to be placed. In addition, the floor board support mechanism 21 supports the front side of the floor board 15 so as to be vibration-proof with respect to the revolving frame 5 by the above-described vibration-proof rubber provided between the mounting bracket 22 and the mounting piece 23.

  Reference numeral 25 denotes a pedestal member disposed on the rear side of the floor plate 15, and the pedestal member 25 is attached to the front surface of the rising wall 17A of the partition plate 17 as shown in FIG. The pedestal member 25 supports the driver's seat 26 described later together with the driver's seat support base 17 </ b> B of the partition plate 17.

  A driver's seat 26 is provided on the floor plate 15 via a pedestal member 25 and the like, and the driver's seat 26 constitutes an operation driving section on which an operator gets on and off together with a cab 29 and the like which will be described later. And the driver's seat 26 is arrange | positioned above the driver's seat support stand 17B and the base member 25 of the partition plate 17 shown in FIG. 8, and comprises the seat which an operator seats. Further, on the left and right sides of the driver's seat 26, operation levers 27 and 27 for operation for operating the operation device 4 and the like are arranged as shown in FIG.

  On the other hand, a pair of travel operation levers / pedals 28 are arranged in front of the driver's seat 26 as shown in FIG. 7, and each travel operation lever / pedal 28 is a lever / pedal of the footrest plate 16 constituting the floor plate 15. It is provided on the mounting portion 16A. The travel operation lever / pedal 28 is used to cause the vehicle (the lower traveling body 2) to travel by switching the control valve 11 when the operator performs a manual operation or a stepping operation.

  Reference numeral 29 denotes a cab as an operation driving unit provided on the floor plate 15 so as to cover the periphery of the driver's seat 26. The cab 29 is formed in a substantially rectangular box structure, and is formed on one side of the left and right direction (vehicle A door (not shown) for getting in and out of the cab 29 is attached to the left side of the cab 29 so as to be openable and closable. The front side of the cab 29 is bolted to the front side portion of the footrest plate 16 of the floor plate 15, and the rear side is bolted to the mounting hole 18 </ b> A of the building mounting plate 18.

  Further, the cab 29 is formed with an L-shaped notch 29B as shown in FIG. 5 on the side surface 29A on the other side in the left and right directions (right side when viewed from the rear of the vehicle). The face plate 19 is disposed in a state of being exposed to the outside of the cab 29 through the notch 29B. The cutout portion 29 </ b> B of the cab 29 is blocked from the outside by the side plate 19.

  Here, the cab 29 is configured as a single unit together with the floor plate 15, the driver's seat 26, the operation lever 27 for operation, the travel operation lever / pedal 28, and the like. 6, the floor plate support mechanism 21 is tilted upward (in the direction of arrow A) with the fulcrum as a fulcrum. At the end of the maintenance work, the cab 29 is tilted rearward and downward (in the direction of arrow B) together with the floor board 15 and the like and returned to the position shown in FIG.

  Next, 30 is a tilting mechanism that is located behind the floor plate support mechanism 21 and provided between the revolving frame 5 and the floor plate 15, and the tilting mechanism 30 moves the cab 29 to the right side of the floor plate 15. Along the side surface portion 29A, the front side and the rear side are extended. As shown in FIGS. 9 to 11, the tilting mechanism 30 is generally configured by a mounting bracket 31, a guide rail 33, a screw shaft 34, a moving member 35, and the like which will be described later.

  Here, when the tilting mechanism 30 tilts the floor plate 15 together with the cab 29 up and down with respect to the revolving frame 5, a connecting pin 32 (described later) located on the revolving frame 5 serves as a rotation fulcrum. The moving member 35 on the 15th side becomes a moving fulcrum. The tilting mechanism 30 moves the floor plate 15 in accordance with the amount of displacement of the moving member 35 by moving the moving member 35 to an arbitrary position in the length direction (arrow C, D direction) of the guide rail 33. It is tilted in the direction of arrows A and B.

  Reference numeral 31 denotes a mounting bracket for mounting the tilting mechanism 30 to the support member 12 on the side of the revolving frame 5, and the mounting bracket 31 is an inclined surface portion of the right front column 12D constituting the support member 12 as shown in FIGS. The base plate 31A is bolted to 12D1, and a pair of support plates 31B and 31B are provided to extend in front and back in parallel on the surface of the base plate 31A. Each support plate 31B of the mounting bracket 31 supports a mounting frame portion 33A of a guide rail 33, which will be described later, so as to be rotatable upward and downward via a connecting pin 32 (rotation fulcrum).

  Reference numeral 33 denotes a guide rail serving as a frame of the tilting mechanism 30, and the guide rail 33 is pivotally attached to the right front column 12 </ b> D of the support member 12 via the mounting bracket 31, and the guide rail 33 is a free end. It is formed as a frame extending elongated to the side. And the guide rail 33 guides the below-mentioned moving member 35 linearly between a base end side and a front end side (free end).

  In this case, the guide rail 33 includes a base frame side mounting frame portion 33A attached to each support plate 31B of the mounting bracket 31 via the connecting pin 32 so as to be rotatable upward and downward, and the mounting frame portion 33A. And a pair of rail portions 33B, 33B extending in parallel with each other with a gap in the upward and downward directions, and a connecting plate portion 33C as a tip connecting portion for connecting the tip portions of the rail portions 33B to each other. Has been. Further, as shown in FIG. 9, a stepped hole 33D to which a screw shaft 34 (described later) is rotatably attached via a thrust bearing 34B is formed in the connecting plate portion 33C on the distal end side.

  Reference numeral 34 denotes a screw shaft disposed between the rail portions 33B and 33B of the guide rail 33. The screw shaft 34 is constituted by an elongated rod-like body having a single or multi-threaded male screw formed on the outer periphery thereof. On one side in the length direction, for example, a corner portion 34A having a hexagonal shape is provided. A thrust bearing 34B is attached to the outer peripheral side of the screw shaft 34 at a position where it abuts on the corner portion 34A, and the thrust bearing 34B is fitted into the stepped hole 33D of the connecting plate portion 33C.

  As shown in FIG. 10, the screw shaft 34 extends between the rail portions 33B of the guide rail 33 so as to extend in parallel along the length direction, and one side in the length direction guides through the thrust bearing 34B. It is rotatably supported by the connecting plate portion 33C (inside the stepped hole 33D shown in FIG. 9) of the rail 33. Further, the screw shaft 34 is attached by being screwed into a screw hole 35C of the moving member 35, which will be described later, to convert the rotation of the screw shaft 34 into a linear displacement of the moving member 35.

  That is, when rotating the screw shaft 34 with respect to the guide rail 33, a screw tightening tool (not shown) such as an impact wrench is engaged with the corner portion 34A of the screw shaft 34, and the screw shaft 34 is moved in this state. When rotated in the forward or reverse direction, the moving member 35 is displaced in the linear direction along the directions indicated by arrows C and D in FIG. 10 between the rail portions 33B and 33B.

  A moving member 35 is screwed onto the screw shaft 34 and is attached to the side plate 19 of the floor plate 15 via a sleeve 20 or the like as shown in FIGS. The moving fulcrum of the tilting mechanism 30 is configured. The moving member 35 moves (displaces) in the directions indicated by arrows C and D between the rail portions 33B of the guide rail 33 as the screw shaft 34 is rotationally driven in the forward and reverse directions.

  In this case, as shown in FIG. 9, the moving member 35 includes a stepped columnar shaft body 35 </ b> A provided extending leftward and rightward, and one end of the shaft body 35 </ b> A (an end away from the side plate 19). And a circular flange 35B provided on the portion side) and projecting radially outward, and a screw hole 35C formed in the radial direction of the shaft body 35A at a position close to the flange 35B. Has been.

  Then, the shaft body 35 </ b> A of the moving member 35 is inserted into the sleeve 20 integral with the side plate 19 while being movably sandwiched between the rail portions 33 </ b> B of the guide rail 33. Further, as shown in FIGS. 9 and 10, a bolt 36 is screwed onto the distal end side of the shaft body 35 </ b> A, and the bolt 36 holds the shaft body 35 </ b> A in a retaining state with respect to the sleeve 20. In this state, the tip end side of the screw shaft 34 is screwed into the screw hole 35C of the moving member 35, whereby the tilting mechanism 30 converts the rotation of the screw shaft 34 into a linear displacement of the moving member 35. It is assembled as possible.

  That is, the tilt mechanism 30 configured as described above is configured such that when a tool such as an impact wrench is engaged with the corner portion 34A of the screw shaft 34 projecting to the outside and the screw shaft 34 is rotationally driven in the forward direction, the screw shaft The moving member 35 screwed to 34 is displaced in a linear direction between the rail portions 33 </ b> B in a direction away from the mounting frame portion 33 </ b> A of the guide rail 33 (arrow C direction).

  Accordingly, the side plate 19 of the floor plate 15 connected to the moving member 35 via the sleeve 20 or the like is moved in the direction indicated by the arrow C away from the mounting bracket 31 on the revolving frame 5 (support member 12) side. The floor board 15 and the cab 29 are tilted (tilted up) in the direction of arrow A in FIG. 6 with the floor board support mechanism 21 as a fulcrum.

  Further, in the tilting mechanism 30, the screw shaft 34 and the moving member 35 are screwed together using a single thread or a multi-threaded screw, and so-called self-locking is provided between the screw shaft 34 and the moving member 35. As long as the function is provided and the rotation of the screw shaft 34 is stopped (that is, unless a force is applied from the outside), the moving member 35 is inadvertently displaced and the floor plate 15 descends downward. Therefore, it is not necessary to provide a special member such as a stopper.

  On the other hand, when the tilting mechanism 30 rotates the screw shaft 34 in the reverse direction to displace the moving member 35 in the direction (arrow D direction) approaching the mounting frame portion 33A along the guide rail 33, the tilting mechanism 30 The distance between the mounting bracket 31 on the 12th side and the moving member 35 gradually decreases, and the floor plate 15 can be tilted (tilted down) in the direction indicated by the arrow B with the floor plate support mechanism 21 as a fulcrum.

  37, 37,... Are screw seats respectively provided on the rail portion 33B of the guide rail 33. These screw seats 37 are spaced apart from each other in the length direction of the rail portion 33B as shown in FIGS. For example, two pieces are provided on the outer surface of each rail portion 33B, for a total of four pieces. When attaching a cover 38, which will be described later, to the guide rail 33, screws 39, which will be described later, are screwed to the screw seats 37, respectively.

  38 is a cover as a protective member for protecting the tilting mechanism 30 from the outside. The cover 38 is formed using a plate material having a U-shaped cross section as shown in FIG. Screw holes 38A, 38A,... Through which the screws 39 are inserted are provided. Further, the cover 38 extends in the length direction of the guide rail 33 as shown in FIGS. 10 and 11, and the length dimension thereof is formed to be substantially the same as that of the rail portion 33B.

  In this case, the cover 38 is fitted to the rail portions 33B and 33B so as to cover the guide rail 33 from the outside, and in this state, the screw 39 is screwed to each screw seat 37, so that the cover 38 can be attached to and detached from the guide rail 33. Mounted on. The cover 38 covers the screw shaft 34, the moving member 35, and the like from the outside of the guide rail 33.

  As a result, the cover 38 protects the screw shaft 34 of the tilting mechanism 30 and the screw hole 35C of the moving member 35 from external wind and rain, dust, etc., and dust from the outside adheres to these screw members. This prevents the rust from being generated on the screw shaft 34 and the like. The tilting mechanism 30 shown in FIGS. 2 and 5 to 7 is shown with the cover 38 removed in order to clearly show the shape of the guide rail 33 and the like.

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

  First, an operator who has entered the cab 29 sits on the driver's seat 26 and operates the traveling operation lever / pedal 28 in this state to cause the lower traveling body 2 to travel. Further, by operating the left and right operation levers 27, for example, the work device 4 is swung in the left and right directions, and moved up and down to perform excavation work of earth and sand. Can do.

  Incidentally, the engine 6 serving as a prime mover of the hydraulic excavator 1 is disposed below the floor plate 15 (cab 29) together with the hydraulic pump 7, the heat exchanger 8, the control valve 11, and the like. For this reason, when the engine 6 of the excavator 1 is maintained (maintenance, inspection), the floor plate 15 is moved together with the cab 29 and the like using the tilting mechanism 30 in the direction indicated by the arrow A in FIG. Need to tilt up.

  When the floor plate 15, the cab 29, etc. are tilted up by the tilting mechanism 30, first, the bolts etc. that attach the building mounting plate 18 of the floor plate 15 to the support member 12 of the revolving frame 5 are removed. At this time, since the tilting mechanism 30 merely connects the revolving frame 5 side and the floor plate 15 side by screwing the screw shaft 34 and the moving member 35, for example, the bolt is removed like a gas damper. The floor plate 15 does not tilt so that it jumps up instantaneously, and the tilting operation and maintenance work can be performed smoothly and safely.

  Next, in order to operate the tilt mechanism 30 in this state, a tool such as an impact wrench is engaged with the corner portion 34A of the screw shaft 34, and the screw shaft 34 is rotationally driven in the forward direction by this tool. Then, as the screw shaft 34 is driven to rotate, the moving member 35 moves in the direction of arrow C along the guide rail 33, so that the floor board 15, the cab 29 and the like to which the moving member 35 is attached are shown in FIGS. 11, it is possible to tilt up in the direction of arrow A with the connecting pin 24 of the floor plate support mechanism 21 as a fulcrum.

  When the floor plate 15 is largely tilted up together with the cab 29, machinery under the floor installed on the revolving frame 5 (for example, the engine 6, the hydraulic pump 7, the heat exchanger 8 and the control valve 11 shown in FIG. 3). Etc.) can be exposed to the outside almost entirely. For this reason, the maintenance worker can easily reach for these machines, and can perform inspection, maintenance, repair, etc. of each machine with a margin.

  The tilt mechanism 30 in which the screw shaft 34 and the moving member 35 are screwed together has a so-called self-locking function between the screw shaft 34 and the moving member 35. As a result, when the screw shaft 34 is rotated using a tool such as an impact wrench, the screw shaft 34 is rotated after the moving member 35 is moved to a desired position in the length direction of the guide rail 33. If the operation is interrupted, the movement of the moving member 35 can be stopped and the floor board 15 can be fixed at a desired tilt position.

  For this reason, an operator (maintenance operator) who rotates the screw shaft 34 of the tilting mechanism 30 includes the engine 6, the hydraulic pump 7, the heat exchanger 8, the control valve 11, and the like disposed below the floor plate 15. When performing maintenance, the tilting position of the floor board 15 can be variably adjusted without using a special stopper or the like depending on which part of these machines is to be maintained (maintenance, inspection). Maintenance work can be easily performed by holding the floor plate 15 at the tilt position.

  As described above, during maintenance work, the floor plate 15 is tilted to the minimum necessary size according to the work content, and the floor plate 15 is not tilted more than necessary. The floor board 15 can be held at the tilt position. And it is not necessary to always incline the floorboard 15 to the fully open position, the work efficiency at the time of maintenance can be improved, and the burden on the operator in performing the inclination operation can be greatly reduced.

  In addition, since there is no obstacle such as a gas damper between the revolving frame 5 and the floor plate 15, a sufficiently large work space for maintenance work can be secured. In addition, since the tilting mechanism 30 is screwed together with the screw shaft 34 and the moving member 35, the floor plate 15 tilted upward may come down due to gas leakage or the like such as a gas damper. The situation can be eliminated, there is no need to provide a stopper member or the like, and the workability during assembly can be improved.

  On the other hand, when the maintenance work as described above is completed, if the screw shaft 34 is rotated in the reverse direction with a tool such as an impact wrench, the moving member 35 is moved along the guide rail 33 toward the mounting frame 33A in the direction indicated by the arrow D. The floor plate 15, the cab 29, etc. can be tilted downward (tilt down) in the direction of arrow B in FIG. Then, the operation of the excavator 1 can be safely performed by bolting the building mounting plate 18 of the floor plate 15 to the support member 12.

  Further, the tilting mechanism 30 including the guide rail 33, the screw shaft 34, the moving member 35, and the like provided between the revolving frame 5 and the floor plate 15 includes wind and rain from outside, dust (small gravel, etc.) at the work site. When exposed to dust or the like, rust is generated in the screw shaft 34, the screw hole 35C of the moving member 35, etc., or small dust or the like adheres to the screwed portions of both, and the tilt mechanism 30 is operated smoothly. Becomes difficult.

  Therefore, in this embodiment, a cover 38 as a protection member is detachably provided on the guide rail 33 of the tilt mechanism 30 via a plurality of screw seats 37, screws 39, and the like, and the guide rail 33 is screwed by the cover 38. The shaft 34, the moving member 35, etc. are covered from the outside.

  Thereby, the screw shaft 34 of the tilting mechanism 30 and the screw hole 35C of the moving member 35 can be protected by the cover 38 from external wind and rain, dust, etc., and the screw portions such as the screw shaft 34 and the screw hole 35C can be externally connected. It is possible to prevent dust and the like from adhering to the surface and to prevent rust from being generated on the thread surface of the screw shaft 34.

  Thus, according to the present embodiment, the tilt mechanism 30 including the guide rail 33, the screw shaft 34, the moving member 35, and the like is provided between the revolving frame 5 and the floor plate 15, and the tilt mechanism 30 is covered with the cover 38. Therefore, the cover 38 can prevent the tilting mechanism 30 from being exposed to external wind and rain and dust at the work site or the like.

  As a result, the cover 38 can prevent the rust from being generated on the screw shaft 34 of the tilting mechanism 30 and the screw hole 35C of the moving member 35, and small dust etc. from adhering to both screwed portions. The rolling mechanism 30 can be operated smoothly and stably over a long period of time. Further, the appearance of the tilting mechanism 30 can be enhanced by the cover 38 to maintain a good appearance, and the commercial value can be increased.

  When the floor 15 is tilted upward together with the cab 29 or the like by the tilting mechanism 30 for maintenance work under the floor, any part of the machine including the engine 6 is maintained (maintenance and inspection). Accordingly, the tilt mechanism 30 can be operated while selecting the tilt position of the floor board 15, and the burden on the operator in performing the tilt operation can be greatly reduced.

  Further, between the revolving frame 5 and the floor plate 15, only one tilting mechanism 30 including the guide rail 33, the screw shaft 34, the moving member 35, and the like is provided, so that the floor plate 15 serving as a heavy object is connected to the cab 29 and the like. Since they can be tilted together, a sufficient work space for maintenance can be secured between the revolving frame 5 and the floor plate 15, and maintenance work for the engine 6, hydraulic equipment, etc. can be easily performed.

  The tilting mechanism 30 in this case does not generate an urging force in the extending direction unlike a gas damper, so the floor plate 15 does not tilt suddenly and requires a large force to push down. Never. For this reason, the tilt-up work and the tilt-down work of the floor board 15 can be performed safely and easily.

  On the other hand, the guide rail 33 of the tilting mechanism 30 is mounted on the support member 12 via the mounting bracket 31 and the moving member 35 is mounted on the side plate 19 of the floor plate 15. The mechanism 30 can be easily and inexpensively installed. Further, since the moving member 35 is attached to the side plate 19 of the floor plate 15 via the sleeve 20 or the like, it corresponds to both the case where the cab 29 is mounted on the floor plate 15 and the case where the canopy (not shown) is mounted. be able to.

  In addition, the tilting mechanism 30 has its tip end directed obliquely upward when the floor plate 15 is tilted. And since the base end side of the tilting mechanism 30 is provided on the tilted surface portion 12D1 of the right front column 12D constituting the support member 12, a large load acting when the floor plate 15 is tilted is surely received by the tilted surface portion 12D1. Can be accepted.

  Further, the screw shaft 34 of the tilt mechanism 30 is attached between the rail portions 33B and 33B so that the end portion close to the corner portion 34A is attached to the connecting plate portion 33C of the guide rail 33 and the other end portion is a free end. Is arranged. Thereby, for example, even when the screw shaft 34 is rotated in a state in which the screw shaft 34 is distorted, the end side of the screw shaft 34 that has become a free end can be shaken to reduce the operating resistance due to the strain. The durability and life of 34 can be improved.

  Further, since the screw shaft 34 of the tilting mechanism 30 is provided with a corner portion 34A that can be engaged with a tool such as an impact wrench on the end side protruding from the connecting plate portion 33C of the guide rail 33, an impact wrench or the like. Can be easily engaged (coupled) with the corner portion 34A of the screw shaft 34, the rotation operation of the screw shaft 34 can be smoothed, and the tilt mechanism 30 can be easily operated.

  Next, FIGS. 12 to 14 show a second embodiment of the present invention. The feature of this embodiment is that a cover that covers the guide rail of the tilting mechanism from the outside is interlocked with the tilting operation of the floor board. Therefore, it is configured to open and close up and down from the guide rail. 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 tilting mechanism employed in the present embodiment. The tilting mechanism 41 is configured in substantially the same manner as the tilting mechanism 30 described in the first embodiment, and includes a mounting bracket 31 and a connecting pin. 32, a screw shaft 34, a moving member 35, a guide rail 42 described later, and the like.

  Reference numeral 42 denotes a guide rail serving as a frame of the tilting mechanism 41. The guide rail 42 is configured in substantially the same manner as the guide rail 33 described in the first embodiment, and includes a mounting frame portion 42A on the base end side, A pair of rail portions 42B, 42B and a connecting plate portion 42C as a tip connecting portion are provided. However, the guide rail 42 in this case is configured such that the connecting plate portion 42C is covered from the upper side by a cover 44 described later together with the pair of rail portions 42B and 42B.

  Further, the guide rail 42 of the tilting mechanism 41 is provided with a pin insertion hole 43 through which a pin 46 (described later) is inserted, for example, in a rail portion 42B positioned on the lower side in FIG. The guide rail 42 is disposed at a position close to the connecting plate portion 42C.

  44 is a cover as a protective member that protects the tilting mechanism 41 from the outside. As shown in FIG. 13, the cover 44 has a pair of left and right side plate portions 44A and 44A, and an upper end side of each side plate portion 44A. The upper plate portion 44B is formed and joined together, and the lower end side of each side plate portion 44A is an open end 44C.

  Then, the side plate portions 44A and 44A of the cover 44 are connected by the upper plate portion 44B with an interval slightly larger than the plate thickness of the guide rail 42 (rail portion 42B, connecting plate portion 42C). 42B and the connecting plate part 42C are configured to be covered from the outside together with the upper plate part 44B.

  Further, pin insertion holes 44D and 44D are formed on one side in the length direction of the cover 44 (corresponding to the front end side of the guide rail 42) and located on the lower end side (opening end 44C side) of each side plate portion 44A. The pins 44 described later are inserted into these pin insertion holes 44D through the pin insertion holes 43 of the rail portion 42B, so that the cover 44 is attached to the guide rail 42 so as to be openable and closable.

  Further, the side plate portion 44A of the cover 44 becomes an inclined surface portion 44E whose end opposite to the pin insertion hole 44D is inclined obliquely, and the flange portion 35B of the moving member 35 is shown in FIG. 12 on the inclined surface portion 44E. In this way, they are brought into contact with each other so as to be relatively movable. That is, when the moving member 35 that is displaced along the screw shaft 34 of the tilting mechanism 41 is closest to the mounting frame portion 42A of the guide rail 42, the flange portion 35B of the moving member 35 is brought into contact with the inclined surface portion 44E of the cover 44. Placed in contact.

  In this state, the cover 44 covers the rail portions 42B and the connecting plate portion 42C of the guide rail 42 from above as shown in FIG. 12, and shields the screw shaft 34 and the like of the tilting mechanism 41 from external wind and rain, dust, and the like. Thus, the guide rail 42 of the tilting mechanism 41 is closed from the outside using the cover 44.

  Further, when the screw shaft 34 of the tilting mechanism 41 is rotated in the forward direction from this state and the moving member 35 is displaced along the screw shaft 34 in the direction indicated by the arrow C, the flange portion 35B of the moving member 35 is By making contact (contact) with the inclined surface portion 44E so as to be relatively movable, the cover 44 rotates upward (in the direction of arrow E in FIG. 12) around a pin 46 described later, and the cover 44 is a guide rail. The relative movement is made upward of 42.

  Then, when the screw shaft 34 of the tilting mechanism 41 is further rotated in the forward direction from this state, and the moving member 35 is displaced along the screw shaft 34 in the direction indicated by the arrow C, the flange portion 35B of the moving member 35 is moved to the cover 44. The inclined surface portion 44E comes into contact with the lower surface side of the side plate portion 44A so as to be relatively movable, whereby the cover 44 is further rotated about the pin 46 to the upper side of the guide rail 42 to guide the guide rail 42. The rail part 42B and the screw shaft 34 are gradually opened to the outside.

  When the moving member 35 is greatly displaced in the arrow C direction along the screw shaft 34, the cover 44 is largely rotated in the arrow E direction as shown in FIG. 42B, the screw shaft 34, and the like are largely opened from the outside. Further, at this time, the floor board 15 is largely tilted up together with the cab 29.

  Reference numeral 45 denotes a collar guide as a restricting member provided on the cover 44. The collar guide 45 is attached to one of the left and right side plate portions 44A, 44A located on the outer side. . As shown in FIG. 13, the flange guide 45 extends in parallel along the lower surface of the side plate portion 44A, and one end portion becomes a curved portion 45A having a substantially U shape, thereby forming the side plate portion 44A (inclined surface portion 44E). ).

  The other end side of the collar guide 45 is a substantially L-shaped curved portion 45B and is fixed to the lower surface side of the side plate portion 44A at a position close to the pin insertion hole 44D. And the collar part guide 45 hold | maintains the collar part 35B of the moving member 35 between the inclined surface part 44E of the cover 44, and the lower surface of the side-plate part 44A so that it may pinch | interpose from a radial direction outer side, and the outer peripheral surface of the collar part 35B is The state where the inclined surface portion 44E of the cover 44 and the lower surface of the side plate portion 44A are in contact with each other is maintained.

  As a result, the flange portion 35B of the moving member 35 is held in a retaining state between the inclined surface portion 44E of the cover 44, the lower surface of the side plate portion 44A, and the flange portion guide 45, and the flange portion guide 45 is inclined with respect to the cover 44. It is compensated for the smooth relative movement of the flange portion 35B along the lower surfaces of the surface portion 44E and the side plate portion 44A. The collar guide 45 also has a function of restricting the cover 44 from being excessively rotated from the guide rail 42 in the direction of arrow E in FIG.

  Reference numeral 46 denotes a pin as a connecting tool for rotatably connecting the cover 44 to the guide rail 42. The pin 46 is formed of a pin insertion hole 43 of the rail portion 42B and a pin insertion hole of the cover 44 as shown in FIG. 44D and 44D are inserted and hold | maintain the cover 44 with respect to the guide rail 42 so that opening and closing is possible.

  Thus, even in the present embodiment configured as described above, by providing the cover 44 so as to be openable and closable with respect to the guide rail 42 of the tilting mechanism 41, for example, in a state where the floor plate 15 is tilted down on the revolving frame 5, The cover 44 can cover the screw shaft 34 and the like of the tilting mechanism 41 from the outside, and can obtain substantially the same functions and effects as those of the first embodiment described above.

  However, according to the present embodiment, when the floor plate 15 is tilted up in the direction of arrow A as shown in FIG. 14 during maintenance on the lower side of the floor, the cover 44 is directed upward from the guide rail 42 (shown by the arrow in FIG. 14). E direction) and the tilting mechanism 41 can be exposed to the outside. At this time, the screw shaft 34 of the tilting mechanism 41 can be lubricated from the outside, and maintenance and inspection can be easily performed. Can be done.

  In each of the above embodiments, the cab specification hydraulic excavator 1 in which the cab 29 is mounted on the floor plate 15 is described as an example. However, the present invention is not limited to this, and a hydraulic excavator with a canopy specification having a canopy covering the upper side of the driver's seat, or a hydraulic pressure of a type in which only the driver's seat is mounted on the floor board without including a cab, a canopy, etc. You may apply to an excavator.

  Further, the present invention is not limited to a hydraulic excavator, and can be widely applied to other construction machines having a floor board, a driver's seat, etc., such as a work vehicle called a hydraulic crane, a wheel loader, a bulldozer, or a lift truck. is there.

1 is a front view showing a cab specification hydraulic excavator according to a first embodiment of the present invention. It is a top view which expands and shows the hydraulic shovel in FIG. 1 from upper direction. It is a top view which shows a turning frame etc. in the state which removed the floor board, the exterior cover, etc. It is a front view which shows the turning frame which attached the supporting member. It is a front view which expands and shows the upper turning body of the state which removed the exterior cover etc. FIG. 6 is a front view of the upper swing body showing a state where the cab in FIG. 5 is tilted up together with the floor board. It is a right view which expands and shows the turning frame, the floor board, cab, etc. in FIG. It is the disassembled perspective view which looked at the floor board in FIG. 7, a floor board support mechanism, a base member, etc. from the left front side. It is a perspective view shown in the state which decomposed | disassembled the tilting mechanism and side plate in FIG. It is an external appearance perspective view shown with a cover in the state which attached the tilting mechanism in FIG. 9 to the side plate. It is a front view which expands and shows a tilting mechanism with a cover in the state which tilted up the cab with the floor board. It is a perspective view which shows the cover by 2nd Embodiment with a tilting mechanism and a side plate. It is a perspective view which shows the cover in FIG. 12 in the state decomposed | disassembled from the tilting mechanism. It is a front view which expands and shows a tilting mechanism with a cover in the state which tilted up the cab with the floor board.

Explanation of symbols

1 Hydraulic excavator (Construction machinery)
4 Working device 5 Rotating frame (frame)
6 Engine 7 Hydraulic pump 8 Heat exchanger 11 Control valve 12 Support member 12A Support base 12B Left front strut 12C Left rear strut 12D Right front strut 12D1 Inclined surface portion 12E Right rear strut 15 Floor plate 16 Footrest plate 17 Bulkhead plate 19 Side plate 21 Floor plate support Mechanism 26 Driver's seat 29 Cab (operating operation part)
30, 41 Tilt mechanism 31 Mounting bracket 32 Connecting pin (rotating fulcrum)
33, 42 Guide rail 33A, 42A Mounting frame portion 33B, 42B Rail portion 33C, 42C Connecting plate portion 34 Screw shaft 34A Corner portion 35 Moving member (moving fulcrum)
35B collar 35C screw hole 37 screw seat 38, 44 cover (protective member)
39 screw 45 buttocks guide 46 pin

Claims (2)

A frame provided with a working device on the front side, an engine mounted on the rear side of the frame, a floor plate provided on the frame located on the front side of the engine, and an operator seated on the floor plate In construction machinery consisting of a driver's seat,
A floor plate support mechanism that is provided between the front position of the frame and the front position of the floor plate, and supports the floor plate in a tiltable manner together with the driver's seat with the front position of the floor plate as a fulcrum;
Positioned on the rear side of the floor plate support mechanism and provided between the frame and the floor plate, the moving fulcrum is displaced to an arbitrary position with the frame side as a rotation fulcrum and the floor plate side as a movement fulcrum. In order to tilt the floor plate forward according to the amount of displacement of the moving fulcrum, a guide rail having a base end side rotatably attached to the frame side and a front end side being a free end and extending to the front side, and the guide A screw shaft that extends in the length direction of the rail and is provided so as to be rotatable with respect to the guide rail, and a guide that serves as the moving fulcrum in a state of being rotatably attached to the floor plate and screwed to the screw shaft. A tilting mechanism comprising a moving member that moves in the length direction of the rail ;
A construction machine comprising a cover as a protective member that covers the screw shaft from the outside of the guide rail in order to protect the tilting mechanism from the outside. The construction machine according to claim 1 , wherein the cover is configured to open and close in conjunction with a tilting operation of the floorboard.

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