JP4625371B2 - Construction machinery - Google Patents

Description

  The present invention relates to a construction machine that is suitably used as, for example, a hydraulic excavator or the like and includes a cab on which an operator rides.

  In general, as a construction machine such as a hydraulic excavator, a machine having a cab on which an operator rides is known, and a cab of such a construction machine is provided with a door that is opened and closed by an operator ( For example, see Patent Documents 1, 2, and 3).

JP-A-1-198929 WO99 / 61711 Japanese Patent Laid-Open No. 11-100844

  In this type of conventional hydraulic excavator, a lower traveling body is provided with an upper swing body so that the upper swing body can swing, and the upper swing body is provided with a cab on a swing frame. The cab is located on the left front, right front, left middle, left rear, and right rear and has five pillars standing upright, and the front, left front side, left rear side, right side, and rear side are formed between the pillars. A hollow cab box is formed by arranging five surfaces, and a door is attached between the left front pillar and the left intermediate pillar of the cab box so that it can be opened and closed.

  Here, in the prior art shown in Patent Document 1 and Patent Document 2, for example, the door is formed in a flat plate shape by a single door panel or the like. The door is configured to be pivotably attached to the left intermediate pillar of the cab box using a hinge or the like and open toward the outside of the cab box.

  Moreover, in the prior art of patent document 3, the foldable door which connected two door panels etc. so that rotation was possible, for example was used. The foldable door includes a first door panel that is rotatably attached to the left intermediate pillar, and a second door panel that is rotatably attached to the front side of the first door panel. In addition, a striker is provided on the outer surface of the second door panel, and a catch is provided on the left rear side of the cab box so as to be detachably engaged with the striker when the door is opened wide. Is provided. Thereby, when work is performed with the folding door open, the door can be locked at the open door position by opening the folding door and engaging the striker with the catch on the cab box side.

  Further, in this prior art, when the folding door is closed, the two door panels are held in a slightly bent state, and at this time, a part of the swivel frame is located on the side of the door below the door. It is arranged in a protruding state.

  By the way, in the prior art described in the patent document 1 and the patent document 2 mentioned above, it is comprised by one door panel which opens the door of a cab toward the outer side. However, when a construction machine is in operation, for example, work may be performed with the door open.When designing the layout of the vehicle body, the open door is not opened so that the door does not interfere with the work. There is a demand to keep the dimensions protruding from the range of the vehicle width small.

  In this case, for example, a method of moving the position of the entire cab toward the center of the vehicle body is also conceivable. However, considering the positional relationship between the cab and other structures and the like, the amount of movement of the cab is limited, and thus there is a limit to suppressing the protrusion of the door by this method.

  For this reason, in the prior art described in Patent Literature 1 and Patent Literature 2, there is a case where the cab must be downsized in order to reduce the dimension that the door protrudes. There is a problem that a sufficient space cannot be secured in the cab, and the operating environment tends to be lowered.

  Moreover, in the prior art described in Patent Document 3, a striker is provided only on the second door panel of the two door panels constituting the folding door, and when the door is opened, the striker is engaged with the catch on the cab box side. The configuration is to let For this reason, since the first door panel is not fixed to the cab box side, play of a hinge or the like for rotatably supporting the first door panel causes rattling or vibration, and durability is reduced. There is a problem.

  Furthermore, in the prior art described in patent document 3, the side panel which forms the outer periphery of a turning frame becomes a structure protruded rather than the outer side surface of a cab. And the space where the folded-back door enters when the door is opened is formed. For this reason, for example, in cold regions and winter work sites, if the construction machine is operated during snowfall or if it is parked outdoors during snowfall, it will be difficult for the door to open due to snow accumulated on the protruding part of the swivel frame. There is a problem that workability is lowered. Moreover, when performing excavation work of earth and sand, this earth and sand may accumulate on the protrusion part of a turning frame.

  Moreover, in the prior art described in Patent Document 3, since the two door panels are connected so as to be foldable, a gap is formed in the folded portion between the door panels. For this reason, even when the foldable door is closed, there is a problem that rainwater, dust and the like enter the cab from the gaps between the door panels.

  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 reduce the size of an opened door that protrudes from the range of the vehicle width, so that the work can be performed even when the door is opened. An object of the present invention is to provide a construction machine that can be smoothly performed, can sufficiently secure a space in a cab, and can improve an operating environment.

  Another object of the present invention is to provide a construction machine that can always open and close a door smoothly even under an environment such as snowfall and can improve workability.

  Another object of the present invention is to provide a construction machine capable of providing a wide rear view to an operator in a cab.

  Furthermore, another object of the present invention is to provide a construction machine that can prevent rainwater, dust, etc. from entering the cab through the folding part between the two door panels and improve the working environment. is there.

  In order to solve the above-described problems, the present invention provides a self-propelled lower traveling body, a cab that is turnably mounted on the lower traveling body, a cab is provided on a frame, and the lower side of the cab is covered with a side cover. The cab is provided with five pillars that are located on the left front, right front, left middle, left rear, and right rear and extend upward and downward. Consists of a hollow cab box with five sides consisting of a side, left rear side, right side, and rear side, and a door that can be opened and closed between the left front pillar and the left middle pillar of the cab box. It is applied to the construction machine.

The feature of the configuration in which the invention of claim 1 is employed, the door includes a first door panel pivotally mounted with hinges to the left intermediate pillar of the cab box, the first door panel It is formed as a foldable door comprising a second door panel that is foldable using an intermediate hinge, and the second door panel is pivotable forward and backward with respect to the first door panel. retaining substantially disposed on the same surface, the first door panel and the second door panel constituting the folding door is open door position when opened relative to the vertical direction and the side cover and wherein the door each individually provided two holding portion for, on the left rear side of the cab box mounted the two holding portions respectively when the folding door becomes the open door position, taken Possibility to previous two locking portions for locking, provided at an interval in the rear direction, the left rear side of the cab box, formed as an arc-shaped curved surface toward the left rear pillar from the left intermediate pillar and, when opening the folding door is to the folding door has a structure that holds in the state of folded along the left rear side of the cab box.

Further, according to the invention of claim 2, the folding door is a telescopic covers a protective cover construction between the two door panels.

Further, according to the invention of claim 3, the left rear pillar constituting said cabin is disposed within a range that does not impair the rearward visibility of the operator seated in the driver's seat in the rear position of the driver's seat provided in the cab It is configured to do.

Furthermore, the seal according to the invention of claim 4, between two door panels constituting the folding door is sandwiched between two door panels when closed the folding door between respective door panel It is set as the structure which provides the sealing member to perform.

  According to the first aspect of the present invention, when the folding door is closed, the side cover located under the door and the folding door can be disposed on substantially the same plane in the vertical direction. Thereby, the left side surface of the cab box can be arranged so as to be substantially aligned with the left side surface of the frame (vehicle body), and the cab box can be formed large within a range that fits in the vehicle width. For this reason, a sufficient space in the cab can be secured, and the operating environment of the operator can be improved without hindering the traveling, turning operation, etc. of the vehicle body.

  In addition, since the folding door is provided with two holding parts, two locking parts are provided on the left rear side of the cab box, and each is locked at the open door position of the door. Even in a folding door that is likely to occur, rattling and vibration can be suppressed by the two sets of holding portions and locking portions, and the door can be stably held at the open door position.

  In addition, the side cover of the upper swing body and the folding door are located on the same plane with respect to the vertical direction, and no step is formed between them. For example, even if the door is closed during snowfall, the folding door It is possible to prevent the door from being difficult to open due to snow or the like on the outside of the door. Therefore, the door can be opened and closed smoothly even in an environment such as snowfall, and workability can be improved.

  On the other hand, when the folding door is opened, the door can be folded along the left rear side surface of the cab box, for example. Thereby, even if the cab is formed large, for example, the opened door can be arranged so as to be within the range of the vehicle width, or the size of the door protruding sideways from the range of the vehicle width can be kept small. Therefore, for example, even in a narrow work site, the work can be performed smoothly with the cab door open. And while suppressing the protrusion of a door, the space in a cab can fully be secured and an operating environment can be improved.

  Furthermore, when the folding door is opened, the two holding portions on the door side can be locked to the respective locking portions on the cab box side. Thereby, for example, even when the work is performed with the cab door open, rattling or the like of the two folding parts of the door can be individually prevented by the two locking portions (and the holding portions). For this reason, it can prevent that each part of a door rattles and a hinge etc. deteriorates or noise is generated.

  In addition, when the folding door is opened, the door can be folded back along the left rear side of the cab box, so that even if the cab is formed large, for example, the opened door fits within the vehicle width range. It is possible to keep the size that the door protrudes from the range of the vehicle width. Therefore, even if the operator opens the door at a narrow work site or the like, for example, the operator can smoothly perform the work without worrying about this.

According to the first aspect of the present invention, when the folding door is opened, the door can be folded back in a substantially arc shape along the left rear side surface of the cab box, and the opened door extends along the side surface of the cab box. Can be arranged compactly. Thereby, the dimension which the opened door protrudes from a cab can be restrained small, forming a cab large enough.
Further, the two door panels can be separately fixed by the two sets of holding portions and locking portions. As a result, the two sets of holding parts and locking parts effectively suppress the rattling of the door panel with respect to the cab box and the rattling between the door panels, making the folding door more stable in the open door position. Can be held.

According to the second aspect of the present invention, the folding part of the two door panels can be covered with the protective cover, and in this state, the protective cover can be expanded and contracted following the folding operation of the door. And when an operator opens and closes a door, it can prevent by a protective cover that a fingertip etc. are pinched | interposed between the folding parts of a door, and can handle a door easily.

Further, according to the invention of claim 3 , the left rear pillar of the cab box is disposed in the rear position of the driver seat within a range not impairing the rear view of the operator seated in the driver seat. The left rear pillar does not block the view when the operator turns back. Thereby, an operator's back view can be expanded and workability | operativity can be improved.

Furthermore, according to the invention of claim 4 , when the folding door is closed, the sealing member can be sealed between the two door panels by being sandwiched between the two door panels. Thereby, rain water, dust, etc. can be prevented from entering the cab, and the working environment in the cab can be improved.

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

  First, FIG. 1 thru | or FIG. 13 has shown the 1st Embodiment of this invention. In the figure, reference numeral 1 denotes a hydraulic excavator. The hydraulic excavator 1 includes a self-propelled lower traveling body 2, an upper revolving body 3 that is turnably mounted on the lower traveling body 2, and the upper revolving body 3. And a working device 4 which is provided so as to be able to move up and down and performs excavation work of earth and sand. Here, the hydraulic excavator 1 is configured as a small swirler called a small rear swirler in which, for example, the upper swing body 3 is formed in a substantially circular shape.

  Further, as shown in FIGS. 1 to 5, the upper swing body 3 includes, for example, a swing frame 5 formed as a support structure by a combination of a bottom plate, a vertical plate (not shown), and the front side of the swing frame 5. A cab 11 to be described later, a counterweight 6 attached to the rear end side of the revolving frame 5, an engine, a hydraulic pump, a heat exchanger (not shown) mounted on the rear side of the cab 11, etc. An engine cover 7 that covers equipment from the rear side, an engine left cover 8 that covers the engine and the like from the left side, a left side cover (left skirt cover) 9 that covers the front side of the revolving frame 5 from the left side, the engine, and the revolving frame 5 Etc. from the right side cover (right skirt cover) 10 and the like. Further, as shown in FIG. 4, 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.

  Here, as shown in FIG. 1, the engine left cover 8 extends from the left side of the engine cover 7 to the lower left side of the cab 11 and covers the left side of, for example, the engine and the hydraulic pump. The left side cover 9 is formed with the lower left side of the cab 11 extending forward so as to be continuous with the tip of the engine left cover 8 and covers the revolving frame 5 from the left side. The left side cover 9 is formed in a substantially flat shape with respect to the vertical direction as a whole.

  On the other hand, as shown in FIG. 2, the right side cover 10 has a rear side inclined downward from the right side of the engine cover 7 to the height of the revolving frame 5, and a front side extending forward to cover the revolving frame 5 from the right side. Yes. The right side cover 10 is formed in a convex curved surface shape, for example, along an arc of the turning radius of the upper turning body 3.

  The engine cover 7, the engine left cover 8, the left side cover 9, the right side cover 10, and the like constitute an outer cover of the upper revolving unit 3 that covers the periphery of the revolving frame 5, such as the engine and the tank.

  Reference numeral 11 denotes a cab of the hydraulic excavator 1 mounted on the left side of the revolving frame 5. The cab 11 is mounted on the revolving frame 5 via an anti-vibration mount (not shown), as shown in FIGS. A floor plate 12 disposed on the revolving frame 5, a driver seat 13 provided on the floor plate 12 and seated by an operator, a cab box 14 described later, and the like. In addition, the driver's seat 13 is disposed at a substantially central portion in the left and right directions near the rear side in the cab box 14 described later.

  Reference numeral 14 denotes a cab box that forms the outer shape of the cab 11. The cab box 14 is provided on the revolving frame 5 so as to surround the driver's seat 13. As shown in FIGS. 6 and 7, the cab box 14 includes five left and right pillars 15, a right front pillar 16, a right rear pillar 17, a center pillar 18, and a left rear pillar 19, which will be described later. It has a pillar and five surfaces including a front surface portion 14A, a right surface portion 14B, a rear surface portion 14C, a left front side surface portion 14D, and a left rear side surface portion 14E arranged between the pillars 15 to 19.

  In this case, the left rear side surface portion 14E of the cab box 14 is a curved surface having a convex arc shape outwardly from the center pillar 18 toward the left rear pillar 19 together with a left rear window glass 20 which will be described later. It is formed as. Thereby, the left rear side surface portion 14 </ b> E can fit the left rear side of the cab box 14 within the turning radius of the upper swing body 3 without narrowing the living space in the cab box 14. Further, the left rear side surface portion 14E is an attachment surface to which the door 26 is attached when a foldable door 26 described later is opened.

  Next, each pillar 15-19 is described in detail. First, the left front pillar 15 is disposed at the left front portion of the cab box 14, and forms a ridge line between the front surface portion 14A and the left front side surface portion 14D. The right front pillar 16 is located at the right front portion of the cab box 14 and forms a ridge line between the front surface portion 14A and the right side surface portion 14B. The right rear pillar 17 is located at the right rear portion of the cab box 14 and forms a ridge line between the right side surface portion 14B and the rear surface portion 14C.

  The center pillar 18 constitutes a left intermediate pillar provided on the left side of the cab box 14 and provided at an intermediate portion in the front and rear directions, and operates at a boundary position between the left front side surface portion 14D and the left rear side surface portion 14E. It is arranged near the left side of the seat 13. A folding door 26 that opens and closes an entrance 24 described later is attached to the center pillar 18 so as to be rotatable in the horizontal direction.

  Further, as shown in FIGS. 3 and 7, the left rear pillar 19 is disposed on the rear side of the cab box 14, and is disposed on the left side of the right rear pillar 17 with an interval of about half the width of the cab box 14. Yes. In this case, the left rear pillar 19 is disposed at a position behind the driver's seat 13 in a range that does not impair the rear view of the operator seated on the driver's seat 13.

  Specifically, the left rear pillar 19 is located in the vicinity of the rear side of the driver's seat 13 so as not to obstruct the field of view when the operator seated on the driver's seat 13 turns to the rear side, preferably the width dimension of the driver's seat 13. It is arranged in the rearward range that fits inside. As a result, the left rear pillar 19 can effectively suppress deformation of the cab box 14 around the position of the operator (driver's seat 13), for example, when the excavator 1 falls or a heavy object collides. it can.

  Further, by arranging the left rear pillar 19 behind the driver's seat 13, an operator seated on the driver's seat 13 is provided between the center pillar 18 and the left rear pillar 19 by turning around the left rear. A wide range from the left rear window glass 20 to the left rear can be used as a visual field. On the other hand, when the operator turns to the right rear, a wide range on the right rear side from the rear window glass 21 provided between the right rear pillar 17 and the left rear pillar 19 can be viewed. Thereby, a wide rear view can be provided to the operator seated in the driver's seat 13.

  Here, the left rear pillar 19 is formed as a columnar body having a transverse cross section by fixing, for example, an inner panel and an outer panel using welding means, and is configured as a strength member having sufficient rigidity. As a result, the left rear pillar 19 can further increase the strength of the central portion on the rear side of the cab box 14 which is important for protecting the operator.

  On the other hand, 22 is a left roof pillar disposed on the upper left side of the cab box 14, and the left roof pillar 22 forms a ridge line between the left front side surface portion 14D, the left rear side surface portion 14E and the top surface portion 14F of the cab box 14. is doing. And the rear side of the left roof pillar 22 is curved with a portion located between the pillars 18 and 19 outwardly forming a convex arc shape. Reference numeral 23 denotes a right roof pillar disposed on the upper right side of the cab box 14, and the right roof pillar 23 forms a ridge line between the right side surface portion 14B and the top surface portion 14F of the cab box 14.

  Reference numeral 24 denotes an entrance / exit provided between the left front pillar 15 and the center pillar 18 of the cab box 14. The entrance / exit 24 is used by an operator to get on and off the cab 11 and is opened and closed by a folding door 26. The In this case, the entrance / exit 24 (foldable door 26) constitutes the left front side surface portion 14D of the cab box 14 together with the lower connecting plate 25 provided between the pillars 15 and 18 at the lower side.

  Reference numeral 26 denotes a foldable door that is rotatably provided on the center pillar 18 of the cab box 14, and the foldable door 26 can be opened and closed between the left front pillar 15 and the center pillar 18 (entrance / exit 24). Is arranged. The foldable door 26 includes door panels 27 and 29, hinges 28 and 31, described later, strikers 32 and 33, a protective cover 37, and the like, and can be folded (bent) into two with the intermediate hinge 31 interposed therebetween. Yes.

  The folding door 26 is pivoted forward and rearward about the center pillar 18 (door hinge 28), and a closed door position for closing the entrance 24 of the cab box 14 as shown in FIGS. As shown in FIGS. 10 and 12, when the door is opened, it is opened and closed between the open door position that is folded back in a substantially arc shape (substantially L shape) along the left rear side surface portion 14E of the cab box 14. Is done.

  Reference numeral 27 denotes a first door panel, and the first door panel 27 is formed in, for example, an elongated rectangular shape extending in the upward and downward directions. The rear side (base end side) in the width direction includes, for example, two door hinges 28. It is attached to the center pillar 18 of the cab box 14 so as to be rotatable. In this case, the two door hinges 28 are provided between the door panel 27 and the center pillar 18 with an interval in the upward and downward directions, and are coupled so as to be rotatable in the horizontal direction.

  Reference numeral 29 denotes a second door panel foldably provided on the first door panel 27, and the second door panel 29 uses upper and lower intermediate hinges 31 on the front side (front end side) of the door panel 27 in the width direction. It is attached and can be rotated forward and backward with respect to the first door panel 27. Further, the second door panel 29 is engaged with a handle 30 held by an operator or the like and a part on the left front pillar 15 side so as to be detachable, and holds the folding door 26 in the closed door position when engaged. A latch mechanism (not shown) that is released from the engaged state by pulling the handle 30 is provided.

  Reference numeral 31 denotes, for example, two intermediate hinges provided between the door panels 27 and 29. The intermediate hinges 31 are arranged at intervals in the upward and downward directions, and connect the two door panels 27 and 29 so as to be foldable. ing.

  7 and 8, when the folding door 26 is in the closed door position, the door panels 27 and 29 extend substantially in a plane to close the entrance / exit 24 of the cab box 14. In this state, the door panels 27 and 29 constituting the folding door 26, the lower connecting plate 25 constituting the cab box 14, and the left side cover 9 constituting the upper swing body 3 are as shown in FIG. It extends in the upward and downward directions, and is disposed on substantially the same plane with respect to the vertical direction. Thereby, the foldable door 26 and the left side cover 9 are continuously connected without a step.

  For this reason, the left front side surface portion 14D of the cab box 14 can be arranged close to the left side to a position close to the maximum within a range that fits in the vehicle width. Further, for example, even if the folding door 26 is closed during snowfall, it is possible to prevent the door from being difficult to open due to snow on the outside of the door panels 27 and 29.

  Further, as shown in FIG. 12, when the folding door 26 is opened, the door panels 27 and 29 are bent in a substantially L shape with the intermediate hinge 31 as a center, thereby forming a left rear side surface portion 14E of the cab box 14. It is folded back in a substantially arc shape along. And the door panels 27 and 29 will be in the state hold | maintained in the open door position by the strikers 32 and 33 and the catches 34 and 35 which are mentioned later, respectively. Thereby, even if the cab 11 is formed large, for example, the dimension at which the door at the open door position protrudes laterally from the range of the vehicle width can be kept small.

  Reference numeral 32 denotes a striker as a holding portion that is provided between the two intermediate hinges 31 so as to protrude outside the first door panel 27. The striker 32 is spaced apart from the door hinge 28 that serves as a pivot for the first door panel 27, and is formed as a substantially U-shaped metal fitting, for example, as shown in FIG. When the folding door 26 is opened, the striker 32 is attached to a catch 34 (described later) provided on the left rear side surface portion 14E of the cab box 14 and is detachably locked, and cooperates with the catch 34. The first door panel 27 is held at the open door position.

  Reference numeral 33 denotes another striker that is positioned on the front side of the handle 30 and that protrudes from the second door panel 29, and the striker 33 is an intermediate hinge 31 that serves as a pivot for the second door panel 29. Is spaced apart from the front side. Similar to the striker 32, the striker 33 is also attached to another catch 35 and locked so as to be removable, thereby holding the second door panel 29 in the open door position in cooperation with the catch 35. Yes.

  34 and 35 are, for example, two catches as locking portions provided on the left rear side surface portion 14E of the cab box 14, and these catches 34 and 35 are attached at positions corresponding to the strikers 32 and 33, The left rear side surface portion 14E is disposed with an interval in the front and rear directions.

  Here, the catch 34 is disposed on the front side of the left rear side surface portion 14 </ b> E of the cab box 14 so as to correspond to the striker 32 provided on the first door panel 27. Further, as shown in FIG. 13, the catch 34 has a fixed portion 34A fixed to the cab box 14 and a substantially U-shaped claw that is supported by the fixed portion 34A so as to be displaceable and to which the striker 32 is locked or detached. It is comprised by the part 34B and the holding spring (not shown) which hold | maintains the nail | claw part 34B where the striker 32 was latched in a fixed position.

  When the first door panel 27 is opened to the open door position, when the claw portion 34B is pushed toward the fixed portion 34A by the striker 32 provided on the door panel 27, the claw portion 34B is displaced and the striker 32 is It will be in the state latched inside claw part 34B. And since this latching state is hold | maintained with the spring force of a holding spring, the door panel 27 can be locked to an open door position.

  Further, when the first door panel 27 is closed from the open door position, when the first door panel 27 is pulled away from the catch 34 by a force of a certain level or more, the claw portion 34B causes the striker 32 to be released against the spring force of the holding spring. It is displaced to. Thereby, the locked state of the striker 32 can be cancelled | released and the door panel 27 can be removed from the locked state.

  On the other hand, the other catch 35 is disposed on the rear side of the left rear side surface portion 14 </ b> E of the cab box 14 so as to correspond to the striker 33 provided on the second door panel 29. Similarly to the catch 34, the catch 35 includes a fixing portion 35 </ b> A, a claw portion 35 </ b> B, and a holding spring, and is configured to be able to lock or remove the striker 33 with one touch.

  Here, the strikers 32 and 33 and the catches 34 and 35 lock the two door panels 27 and 29 separately. In other words, the first door panel 27 is locked by the striker 32 and the catch 34, and the second door panel 29 is locked by the striker 33 and the catch 35. As a result, the strikers 32 and 33 and the catches 34 and 35 can individually prevent rattling of the door panels 27 and 29, and the folding door 26 is moved to the open door position in cooperation with a door cushion 36 described later. Can be held stably.

  Reference numeral 36 denotes a door cushion 36 provided on the left rear side surface portion 14E or the top surface portion 14F of the cab box 14. The door cushion 36 includes a bracket 36A attached to the cab box 14 and an elastic body 36B formed of an elastic material such as rubber and attached to the bracket 36A.

  The elastic body 36B is in elastic contact with the second door panel 29 when the folding door 26 is in the open door position. As a result, the door cushion 36 elastically supports the entire door and cooperates with the strikers 32 and 33 and the catches 34 and 35 to cushion the folding door 26, to absorb vibrations, and to protect it. is doing.

  Reference numeral 37 denotes a protective cover provided between the door panels 27 and 29 of the folding door 26 for protecting the fingertips of the operator. The protective cover 37 is made of, for example, an elastic material or a flexible material, and has a bellows shape. Sheet, cloth, film and the like.

  The protective cover 37 covers the space between the two folding doors 26 (door panels 27 and 29) over almost the entire length in the upper and lower directions, and is extendable in the width direction of the door. Yes. Thereby, the protective cover 37 opens and closes the folding door 26, and when the two door panels 27 and 29 are bent by the intermediate hinge 31, an operator's fingertip or the like is provided between the door panels 27 and 29. Is prevented from being pinched.

  The hydraulic excavator 1 according to the first embodiment has the above-described configuration, and the operation thereof will be described next.

  First, when the operator sits on the driver's seat 13 in the cab 11 and closes the foldable door 26, the foldable door 26 and the left side cover 9 that constitutes the outer cover of the upper swing body 3, as shown in FIG. Are arranged on substantially the same plane with respect to the vertical direction. As a result, the left front side surface portion 14D of the cab box 14 can be arranged so as to be substantially aligned with the left side surface of the turning frame 5, so that the cab box 14 can be formed sufficiently large within the range of the vehicle width and the operating environment of the operator is improved. be able to.

  Then, the operator seated in the driver's seat 13 in the cab 11 operates the operation lever or the like to drive the vehicle or turn the upper swing body 3 and operate the work device 4 to excavate earth and sand. Etc. can be performed.

  Here, the hydraulic excavator 1 travels in an unreasonable posture, for example, on a steep slope or the like, and may fall over when a work is carried out, and a large load acts on the cab 11 when it falls down. However, in the cab 11 according to this embodiment, the left rear pillar 19 of the cab box 14 is disposed at the rear position of the driver's seat 13, so that the left rear pillar 19 can be operated even when a large load is applied to the cab 11. The cab box 14 can be prevented from being greatly deformed around the driver's seat 13, and the operator seated on the driver's seat 13 can be protected.

  Further, since the left rear pillar 19 is disposed at the rear position of the driver's seat 13, even if the operator seated on the driver's seat 13 swings his head and turns to the rear side, the rear left pillar 19 in the rear position is in view. Since it does not enter and does not get in the way, the operator can work efficiently with a wide rear view.

  Further, for example, when the work is performed with the door 26 opened, the operator opens the folding door 26 and rotates it to the rear side to the open door position along the left rear side surface portion 14E of the cab 11. After that, the strikers 32 and 33 on the door side are pressed against the catches 34 and 35, respectively. As a result, the operator can lock the strikers 32, 33 to the catches 34, 35 with one touch, and can lock the folding door 26 at the open door position by such a simple operation.

  In this state, the folding door 26 can be compactly folded along the arcuate left rear side surface portion 14E and the engine left cover 8, so that the operator can determine the position of the opened door 26, the protruding state, etc. The vehicle can smoothly run and turn without worrying more than necessary.

  At this time, external force such as vibration and impact is easily applied to the folding door 26 in the opened state during traveling and working. However, the first door panel 27 constituting the folding door 26 is held at the open door position by the striker 32 and the catch 34, and the door panel 27 is held at the open door position by the striker 33 and the catch 35. The folding door 26 is elastically supported by a door cushion 36. As a result, when the folding door 26 is opened, the two door panels 27 and 29 are held individually, so that the door panels 27 and 29 are wobbled and the hinges 28 and 31 are deteriorated or noise is generated. Can be prevented.

  When closing the foldable door 26, the strikers 32 and 33 can be easily pulled out from the catches 34 and 35 by pulling the door panels 27 and 29 away from the cab box 14, and the door is smoothly closed. be able to.

  Thus, according to the first embodiment, the folding door 26 is formed by the two door panels 27 and 29, and the door panels 27 and 29 are provided with the strikers 32 and 33, and the left rear side surface of the cab box 14 is provided. The part 14E is configured to have catches 34 and 35 at positions corresponding to the strikers 32 and 33.

  Therefore, the folding door 26 can be folded back along the left rear side surface portion 14E of the cab box 14 when opened. As a result, even if the cab 11 is formed large, for example, the open folding door 26 is arranged so as to be within the range of the vehicle width, or the folding door 26 is located laterally from the range of the vehicle width of the lower traveling body 2. It is possible to keep the size that protrudes to a small size.

  In particular, in the first embodiment, since the left rear side surface portion 14E of the cab box 14 is formed in an arc shape, the opened door can be folded back in a substantially arc shape along the left rear side surface portion 14E. The entire door can be compactly arranged and stored in the open door position.

  In this open door position, the two door panels 27 and 29 can be stably locked in the open door position by the two sets of strikers 32 and 33 and catches 34 and 35, respectively. As a result, it is possible to reliably prevent the door from being moved out of the open door position due to the rattling of the door panels 27, 29, and the deterioration of the hinges 28, 31, noise, etc., and the durability of the door can be improved. .

  Accordingly, even when the folding door 26 is opened, the operator can smoothly operate the vehicle and perform various operations without worrying about the position or rattling of the door 26. Etc., the work can be performed efficiently.

  In addition, since the first door panel 27 is locked by the striker 32 and the catch 34 and the second door panel 29 is locked by the striker 33 and the catch 35, the striker 32, 33 and the catch 34, 35 are connected to the cab box 14. The rattling of the first door panel 27 with respect to the first door panel 27 and the rattling of the second door panel 29 with respect to the first door panel 27 can be separately prevented, and the folding door 26 can be held more stably by the open door position. .

  Further, by using the folding door 26 to prevent the door from protruding, for example, the left front side surface portion 14D and the left rear side surface portion 14E of the cab box 14 can be arranged close to the left side within the vehicle width. it can. Thereby, a sufficient space in the cab 11 can be secured, and the operating environment of the operator can be improved.

  On the other hand, when the folding door 26 is closed, the door panels 27 and 29 constituting the folding door 26, the lower connecting plate 25 of the cab box 14, and the left side cover 9 constituting the upper swing body 3 are vertically arranged. Since they are arranged on substantially the same plane with respect to the direction, these three portions can be connected as a substantially continuous plane without a step.

  As a result, the left front side surface portion 14D of the cab box 14 can be arranged to the left side to a position that is almost the maximum within the range that fits in the vehicle width, and the space in the cab 11 can be sufficiently secured within the vehicle width range. it can. Therefore, the operating environment of the operator can be improved without hindering the traveling of the vehicle body, the turning operation, and the like.

  Further, the folding door 26 and the left side cover 9 of the upper swing body 3 are substantially flush with each other, and there is no step on the lower side of the folding door 26. For this reason, for example, even if the folding door 26 is closed during snowfall, it is possible to prevent the door from being hard to open due to snow on the outside of the door panels 27 and 29, and the door opening and closing operations can always be performed smoothly. it can.

  Further, since the protective cover 37 having elasticity is provided between the door panels 27 and 29, the space can be covered by the protective cover 37. In this state, the protective cover 37 follows the folding operation of the door. Can be expanded and contracted. When the operator opens and closes the foldable door 26, the protective cover 37 can prevent the fingertips and the like from being caught between the door panels 27 and 29, and the door can be handled easily.

  Further, the left rear side surface portion 14 </ b> E of the cab box 14 is formed as an arcuate curved surface from the center pillar 18 toward the left rear pillar 19. For this reason, as described above, even when the cab 11 is mounted on a small hydraulic excavator 1 called a small rear swing machine in which the upper swing body 3 is formed in a substantially circular shape, the left rear side surface portion 14E is placed within the swing radius. And the work performance can be improved by reducing the turning radius. Moreover, since the left rear side surface portion 14E of the cab box 14 is formed as a curved surface, the rigidity can be increased compared to the flat surface, and therefore the strength of the cab box 14 is further increased in the vicinity of the driver's seat 13. Can do.

  Furthermore, since the left rear pillar 19 of the cab box 14 is disposed behind the driver's seat 13, a portion of the cab box 14 surrounding the driver's seat 13 that is close to the operator seated on the driver's seat 13 is left rear. The pillar 19 can be strengthened efficiently. Therefore, for example, even when the excavator 1 falls down and a large load is applied to the cab box 14, the deformation of the cab box 14 can be suppressed to a small level at the operator's position.

  Moreover, the left rear pillar 19 of the cab box 14 is disposed at the rear position of the driver's seat 13 within a range that does not impair the rear view of the operator seated on the driver's seat 13, so the operator turned the rear side. The left rear pillar 19 can be removed from the field of view, and the workability can be improved by widening the rear field of view.

  Further, since the center pillar 18 is disposed in the cab box 14 near the left side of the driver's seat 13, a portion of the cab box 14 that is close to the operator seated on the driver's seat 13 together with the left rear pillar 19. It can be strengthened efficiently.

  Next, FIGS. 14 to 16 show a second embodiment of the present invention. The feature of this embodiment is that a seal member is provided between the two door panels constituting the foldable door so as to be sandwiched between the two door panels when the foldable door is closed to seal the door panels. There is a configuration to provide. In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  In FIG. 14, reference numeral 41 denotes a seal member provided between the two door panels 27 and 29 of the folding door 26 and provided separately from the protective cover 37. The seal member 41 is sandwiched between the door panels 27 and 29 at the closed door position of the foldable door 26 shown in FIG. 14, so that rainwater, dust and the like enter the cab 11 through the door panels 27 and 29. This is to prevent this.

  Further, as shown in FIG. 15, the seal member 41 is provided on the front end surface 27A of the first door panel 27 so as to extend upward and downward, and is a first seal 42 having a substantially U-shaped cross section made of, for example, an elastic material. And a second seal 43 that extends upward and downward on the rear end surface 29A of the second door panel 29 so as to face the first seal 42. Here, the first seal 42 is fixed to the front end surface 27A of the first door panel 27 using means such as adhesion, fitting, and screwing. Further, the second seal 43 is formed into a hollow tube shape using an elastic material or the like so that it can be easily deformed to be in close contact with the first seal 42, and the rear end surface 29 </ b> A of the second door panel 29 is formed. It is fixed by using means such as adhesion, fitting and screwing.

  Here, as shown in FIGS. 14 and 15, when the folding door 26 is closed and disposed at the closed door position, the front end face 27 </ b> A of the door panel 27 and the rear end face 29 </ b> A of the door panel 29 approach each other. Thereby, since the sealing member 41 is pinched | interposed between each door panel 27 and 29, when the 1st seal | sticker 42 and the 2nd seal | sticker 43 contact | abut and closely_contact | adhere, it can exhibit sealing performance. Thus, in the sealed state in which the first seal 42 and the second seal 43 are in close contact with each other, the gap between the door panels 27 and 29 can be blocked, and external rainwater and dust enter the cab 11. Can be prevented. On the other hand, as shown in FIG. 16, when the folding door 26 is opened and disposed at the open door position, the seal member 41 separates the first seal 42 and the second seal 43.

  Thus, also in the second embodiment configured as described above, it is possible to obtain substantially the same operational effects as those of the first embodiment described above. In particular, according to the second embodiment, since the sealing member 41 is provided between the two door panels 27 and 29 separately from the protective cover 37, the folding door 26 is disposed at the closed door position. Sometimes, the seal member 41 can seal between the two door panels 27 and 29. Accordingly, it is possible to prevent external rainwater and dust from entering the cab 11 and to improve the working environment.

  Next, FIG. 17 to FIG. 19 show a third embodiment of the present invention. The feature of this embodiment is that the seal member is provided as a part of the protective cover. Note that in the third embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and description thereof is omitted.

  In FIG. 17, reference numeral 51 denotes a protective cover according to this embodiment provided between the door panels 27 and 29 of the folding door 26. Similar to the protective cover 37 according to the first embodiment, the protective cover 51 prevents an operator's fingertips from being sandwiched between the door panels 27 and 29, and is formed using, for example, an elastic material. ing. Here, as shown in FIG. 18, the protective cover 51 has a bellows portion 51A on both sides in the front and rear directions (width direction), and an intermediate portion sandwiched between the bellows portions 51A is a seal portion 51B as a seal member. It has become.

  Here, the seal portion 51 </ b> B constituting a part of the protective cover 51 is provided between the door panels 27 and 29. Specifically, the seal portion 51B is a tube extending upward and downward by inflating a substantially intermediate portion in the front and rear directions of the protective cover 51 in a substantially C shape so as to protrude between the door panels 27 and 29. It is formed in a shape.

  17 and 18, when the folding door 26 is closed and disposed at the closed door position, the front end surface 27A of the first door panel 27 and the rear end surface 29A of the second door panel 29 approach each other. . Accordingly, the seal portion 51B is sandwiched between the front end surface 27A of the door panel 27 and the rear end surface 29A of the door panel 29 and comes into contact with the front end surface 27A and the rear end surface 29A, thereby closely contacting them and providing a sealing property. It can be demonstrated. Thus, in the sealed state in which the seal portion 51B is in close contact with the door panels 27 and 29, the gap between the door panels 27 and 29 can be blocked, and external rainwater and dust can enter the cab 11. Can be prevented.

  On the other hand, as shown in FIG. 19, when the folding door 26 is opened and disposed at the open door position, the seal portion 51B exhibits the same function as each bellows portion 51A by opening the opening side having a C-shaped cross section. can do.

  Thus, also in the third embodiment configured as described above, it is possible to obtain substantially the same operational effects as those of the second embodiment described above. In particular, according to the third embodiment, since the seal portion 51B of the protective cover 51 is provided between the two door panels 27, 29, when the folding door 26 is disposed at the closed door position, the seal portion The space between the two door panels 27 and 29 can be sealed by 51B. Moreover, since the seal portion 51B is integrally formed as a part of the protective cover 51, the number of parts can be reduced, and assembling workability and the like can be improved.

  In the first embodiment, the strikers 32 and 33 provided on the foldable door 26 are formed as substantially U-shaped fittings, and the substantially U-shaped claw portions of the catches 34 and 35 provided on the cab box 14 are formed. The case where 34B is configured to be engaged with the strikers 32 and 33 has been described as an example. However, the present invention is not limited to this. For example, as described in Japanese Patent Laid-Open No. 1-198929 described above, the striker is formed as a rod-like body having a large-diameter tip, and the catch is the striker. It is good also as a structure formed from the nail | claw part etc. which latch to a front-end | tip large diameter part. In this case, when the foldable door is opened, the foldable door can be held at the open door position by locking the claw portion of the catch to the large diameter portion of the tip of the striker from the periphery.

  In the second embodiment, the seal member 41 includes a first seal 42 provided on the front end surface 27A of the first door panel 27, and a second door panel so as to face the first seal 42. The case where it is configured by the second seal 43 provided on the rear end surface 29A of the 29 is described as an example. However, the present invention is not limited to this. For example, a seal member is provided only on the front end surface 27A of the first door panel 27 and the seal member is pressed against the rear end surface 29A of the second door panel 29 to obtain a seal function. It is good. Similarly, the sealing member may be provided only on the rear end surface 29 </ b> A of the second door panel 29.

  Furthermore, in each embodiment, a small hydraulic excavator was described as an example of the construction machine. However, the present invention is not limited to this, and can also be applied to construction machines such as medium- and large-sized hydraulic excavators, wheel-type hydraulic excavators, and hydraulic cranes.

It is a front view which shows the hydraulic excavator applied to the 1st Embodiment of this invention. It is a rear view of the hydraulic shovel shown in FIG. It is a right view of the hydraulic shovel shown in FIG. It is a top view of the hydraulic shovel shown in FIG. It is the perspective view which looked at the hydraulic shovel shown in FIG. 1 from the diagonal rear side. It is a perspective view which shows a cab box alone. It is the cross-sectional view which expanded the cab from the arrow VII-VII direction in FIG. It is a principal part expanded sectional view which expands and shows the folding door etc. of the closed door position in FIG. It is a principal part expanded sectional view which shows the state which closed the folding door and arrange | positioned on the same surface as the left side cover of the cab from the arrow IX-IX direction in FIG. It is the perspective view which looked at the state which opened the door of the cab from the same position as FIG. It is a top view which shows the vehicle body of a hydraulic excavator in the state which opened the door. It is the cross-sectional view which looked at the state which opened the door of the cab from the same position as FIG. It is a principal part expanded sectional view in FIG. 12 which shows the state which opened the folding door. It is the principal part expanded sectional view which looked at the folding door etc. in which the sealing member by the 2nd Embodiment of this invention was provided from the same position as FIG. It is a principal part expanded sectional view which expands and shows the sealing member etc. in FIG. It is a principal part expanded sectional view which shows the state which has arrange | positioned the folding door in the open door position. It is the principal part expanded sectional view which looked at the folding door provided with the protective cover which has the seal part by the 3rd Embodiment of this invention from the same position as FIG. It is a principal part expanded sectional view which expands and shows the protective cover etc. in FIG. It is a principal part expanded sectional view which shows the state which has arrange | positioned the folding door in the open door position.

Explanation of symbols

1 Hydraulic excavator (Construction machinery)
2 Lower traveling body 3 Upper revolving body 5 Revolving frame (frame)
9 Left side cover 11 Cab 13 Driver's seat 14 Cab box 14A Front part 14B Right side part 14C Rear side part 14D Left front side part 14E Left rear side part 15 Left front pillar 16 Right front pillar 17 Right rear pillar 18 Center pillar (left middle pillar)
19 Left rear pillar 24 Entrance 26 Folding door 27 First door panel 29 Second door panel 32, 33 Strike (holding part)
34, 35 Catch (locking part)
37, 51 Protective cover 41 Seal member 51B Seal part (seal member)

Claims (4)

A self-propelled lower traveling body, and an upper revolving body that is mounted on the lower traveling body so as to be pivotable and has a cab provided on a frame and that covers the lower side of the cab with a side cover, There are five pillars that are located on the left front, right front, left middle, left rear, and right rear and extend upward and downward, and the front, left front side, left rear side, right side, and rear side are formed between the pillars. In a construction machine comprising a hollow cab box provided with five surfaces, and a door that can be opened and closed between a left front pillar and a left intermediate pillar of the cab box,
The door includes a first door panel rotatably attached to the left intermediate pillar of the cab box using a door hinge, and a second door panel provided on the first door panel so as to be foldable using the intermediate hinge. Formed as a foldable door, the second door panel can be rotated forward and rearward relative to the first door panel,
The foldable door and the side cover are arranged on substantially the same plane with respect to the vertical direction,
The first door panel and the second door panel constituting the folding door provided open when the for holding the open door position two holding part individually,
On the left rear side of the cab box, the two holding portions are respectively attached to the front and rear of the foldable door when the folding door is in the open door position, and the two holding portions are removably locked. With a gap in the direction ,
A left rear side surface of the cab box is formed as an arcuate curved surface from the left intermediate pillar toward the left rear pillar, and when the folding door is opened, the folding door is moved to the left of the cab box. construction machine is characterized in that a structure that holds in the state of folded along the rear side. The construction machine according to claim 1, wherein the folding door is provided with a protective cover that covers a space between two door panels so as to be extendable and contractible. Left rear pillar which constitutes the cab was claim 1 or comprising a structure to dispose within a range not to impair the rearward visibility of the operator seated in the driver's seat in the rear position of the driver's seat provided in the cab The construction machine according to 2 . A seal member is provided between the two door panels constituting the foldable door so as to be sandwiched between the two door panels when the foldable door is closed to seal between the door panels. 1, 2 or the construction machine according to 3.

Images