JP2008195234A - Cab structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cab structure capable of compatibly realizing wide front view and sufficient strength. <P>SOLUTION: The cab structure comprises right and left front pillars 2 which are provided on a front part of a cab 1 of a construction machine and vertically extend to form strength members, and a front window 3 which is arranged between the front pillars 2 to cover a front side of the cab 1, and opened from the front side inward of a ceiling. At least one front pillar 2 is separated backwardly from the front window 3, and a front side window 8 is provided between the front pillar 2 and the front window 3. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a cab structure for a construction machine.

  Conventionally, as a cab structure of a construction machine, there is one in which pillars 72 are arranged at four corners of a cab 71 as shown in FIG. 15 (see, for example, Patent Document 1).

  The cab 71 includes left and right front pillars 72, 72 disposed at the front end, a front window 73 provided between the front pillars 72, 72, a door 74 provided on the left side surface of the cab 71, and a cab. And a roof 75 provided on the roof 75.

  In the cab 71 of such a construction machine, it is necessary to open the front window 73 and check the work reference directly (for example, the ground reference line in a hydraulic excavator). The right front view was important.

  In the cab 71 of FIG. 15, the front window 73 is divided into upper and lower parts, and the upper side of the front window 73 is formed so as to be slidable from the front surface of the cab 71 to the inside of the ceiling.

  Specifically, as shown in FIGS. 16 to 18, a window rail 77 for guiding the front window 73 to be openable and closable is installed on the front pillar 72.

JP 2004-34783 A

  However, the cab structure described above has a problem in that the front pillar 72 hinders forward visibility.

  That is, as shown in FIG. 18, the pillar 72 of the conventional cab 71 is required to have a cross-sectional strength that can withstand input in order to ensure the safety of the occupant when the vehicle falls over and falls. To make it thick. Therefore, although the front visibility is important, the front pillar 72 greatly hinders the visibility (in FIG. 18, the occupant's eye point is indicated by E and the blind spot is indicated by the dotted line D).

  In addition, it is necessary to ensure the safety of the occupant against a fall or falling object. However, since the front upper view and the lower view are important, the pillar 72 and other strength members (floor cross member, front header, etc.) ) Could not be installed.

  In addition, when the glass is bent right and left like the front window of an automobile, the field of view is widened, but it is not realistic to bend it because the image is distorted.

  Accordingly, an object of the present invention is to provide a cab structure capable of solving the above-described problems and achieving both a wide forward field of view and sufficient strength.

  In order to achieve the above object, the present invention provides a left and right front pillar which is provided at a front portion of a cab of a construction machine and extends up and down to form a strength member, and is disposed between the front pillars to cover the front surface of the cab. In the cab structure provided with a front window that can be opened from the front to the inside of the ceiling, at least one of the front pillars is provided spaced apart rearward from the front window, and between the front pillar and the front window, A front side window is provided.

  A door for getting on and off is provided on either the left or right side of the cab, and the front pillar on the door side is provided at substantially the same front and rear position as the front window, while the front pillar on the opposite side of the door is provided. It may be provided spaced apart from the front window.

  Preferably, the upper window rail is disposed inside the ceiling and extends in the front-rear direction, and guides the upper end portion of the front window. The left and right upper window rails extend vertically along the front pillar, and the lower end portion of the front window is It is provided with left and right lower window rails for guiding.

  Left and right upper window rails that are arranged inside the ceiling and extend in the front-rear direction to guide the upper end portion of the front window, and left and right lower window rails that extend in the upper and lower directions and guide the lower end portion of the front window The lower window rail on the door side is attached to the front pillar on the door side, and the lower window rail on the opposite side to the door extends forward from the front pillar to the front pillar spaced apart to the rear. It may be provided at the same front-rear position as the lower window rail on the door side via a rail bracket.

  Preferably, an upper roller capable of rolling on the upper window rail is provided at an upper end portion of the front window, and a lower roller capable of rolling on the lower window rail is provided at a lower end portion of the front window. Is.

  Left and right lock members provided on the front window, and left and right hinges provided on the upper part of the front pillar via a hinge stay extending forward from the front pillar to rotatably support the upper end of the front window And a left and right closure for engaging the lock member of the front window and locking the front window in the closed position. The member is provided at a lower portion of the front pillar with a lock stay extending forward from the front pillar. A lock engagement member, and a left and right open lock engagement member which is provided above the rear portion of the cab and engages with the lock member of the front window to lock the front window in the open position. It may be a thing.

  Left and right lock members provided on the front window, a hinge member provided on an upper part of the front pillar on the door side, for rotatably supporting the upper end of the front window, and a front side opposite to the door A hinge member provided at the same front and rear position as the door side hinge member via a hinge stay extending forward from the front pillar at an upper portion of the pillar; and a hinge member for rotatably supporting the upper end of the front window; A closing lock engaging member provided at a lower portion of the front pillar on the side for engaging the locking member of the front window to lock the front window in a closed position; and a lower portion of the front pillar on the opposite side of the door Through the lock stay extending forward from the front pillar to the same front and rear position as the closing lock engaging member on the door side. A closed lock engaging member that engages with a lock member of the front window and locks the front window in a closed position; and a lock member of the front window provided above a rear portion in the cab. And left and right open lock engagement members for locking the front window in the open position.

  Preferably, a window frame for supporting the front side window is provided along the front end of the front side window, and a weather for waterproofing the window frame between the front side window and the front window is provided. A strip is provided, and the window frame and the weather strip are arranged so as to overlap each other when viewed from the passenger in the cab.

  According to the present invention, it is possible to achieve an excellent effect that both a wide front field of view and sufficient strength can be achieved.

  Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

[First Embodiment]
The cab structure of this embodiment is applied to a cab of a construction machine, and is applied to, for example, an excavator (hydraulic excavator) in which a bucket is disposed on the right side of a driver's seat.

  An outline of the cab structure of the present embodiment will be described based on FIGS.

  As shown in FIG. 1 and FIG. 4, the cab structure of the present embodiment is provided at the front portion of the cab 1 of the construction machine and left and right front pillars 2, 2 extending vertically, and at the rear portion of the cab 1. The left and right rear pillars (not shown) that extend, the left and right roof rails (not shown) that are provided at the top of the cab 1 and extend from the front pillars 2 and 2 to the rear pillar, and the front of the cab 1 that covers the front of the cab 1 can be opened and closed vertically A window 3, left and right window rails 4 and 4 for slidably guiding the front window 3 from the front to the top of the cab 1, and a front pillar 2 and a rear pillar on the right side (side where the bucket is disposed) A right panel 5 covering the space, a door 6 for getting on and off the left side of the cab 1, a roof 7 forming a ceiling of the cab 1, and a front window And a front side window 8, 8 provided between the front pillar 2, 2 and the left and right.

  The above-described front pillar 2, rear pillar, roof rail, front header 10 (see FIG. 6) that connects the upper ends of the left and right front pillars 2 and 2, and the like provide the strength of the cab 1 (particularly, the strength when falling). Make a strength member to secure.

  The front pillars 2 and 2 are spaced apart from each other on the left and right, and are disposed behind the front window 3. Specifically, from the front end (front window 3) of the cab 1 to the driver's seat side so as not to obstruct the front view of the occupant of the cab 1 and to secure a desired protective space around the occupant when the vehicle falls over ( They are spaced apart by a predetermined distance.

  As shown in FIG. 6, the front pillar 2 is formed in an arcuate shape that extends from the lower end to the upper end of the cab 1 and has an intermediate portion slightly curved forward. For example, the front pillar 2 is made of a hollow pipe material (such as a deformed steel pipe or a press-formed panel outer inner that forms a closed section) and is formed integrally with the roof rail. Note that the front pillar is not limited to an arcuate shape, and may be a linear shape, or may be divided from a roof rail.

  An upper rail bracket 15 that extends forward and supports an upper window rail 17 to be described later is provided on the upper portion of the front pillar 2. A lower rail bracket 16 that extends forward and supports a lower window rail 18 to be described later is provided at the lower portion of the front pillar 2.

  The window rail 4 is arranged on the inner side of the ceiling (for example, the side surface of the roof rail) and extends in the front-rear direction, along the left and right upper window rails 17 and 17 for guiding the upper end portion of the front window 3 and the front pillar 2. And left and right lower window rails 18 and 18 for guiding the lower end of the front window 3.

  The upper window rail 17 extends forward from the rear end of the cab 1, beyond the front pillar 2, to the front end of the cab 1 (the front window 3 in the closed position in FIG. 6). The upper window rail 17 is made of a channel material having a U-shaped cross section, and an upper roller 31 (to be described later) of the front window 3 is fitted between the flanges of the channel material so as to be able to roll forward and backward.

  The lower window rail 18 extends downward from the upper end of the front pillar 2 along the front pillar 2, and the front end of the cab 1 is inclined continuously downward from the rotation guide 21. And a slide guide 22 extending forward to the front window 3 in the closed position. The lower window rail 18 (the rotation guide portion 21 and the slide guide portion 22) is made of a channel material having a U-shaped cross section, and the web of the rotation guide portion 21 is joined to the inner side surface of the front pillar 2. Are joined to the lower rail bracket 16 of the front pillar 2. Further, a lower roller 32 (to be described later) of the front window 3 is fitted between the flanges of the rotation guide 21 and the slide guide 22 so as to be freely rotatable.

  Returning to FIG. 1, the front window 3 according to the present embodiment is divided into an upper front window 25 and a lower front window 26 so as to be divided into upper and lower parts, and a waterproof structure is provided between the upper front window 25 and the lower front window 26. A sealing material 27 is provided.

  The upper front window 25 is formed to be slidable upward from the front surface of the cab 1 to the inside of the ceiling.

  Specifically, as shown in FIG. 4, roller frames 30, 30 extending vertically are provided on the rear surface side (cab inner side) of the left and right ends of the upper front window 25. An upper roller 31 (see FIG. 6) that rolls on the upper window rail 17 of the window rail 4 is pivotally supported at the upper end portion of the roller frame 30, and the lower roller rail 18 on the window rail 4 is rolled at the lower end portion. A moving lower roller 32 is pivotally supported.

  Returning to FIG. 1, the front side window 8 closes the space between the front pillar 2 and the front window 3 and extends from the lower end of the cab 1 to the upper end (the lower surface of the front roof window 45 described later).

  As shown in FIG. 4, the front side window 8 extends forward from the front pillar 2 to the front window 3 while inclining inward of the cab. In the present embodiment, the front end of the front side window 8 is located on the outer side in the left-right direction with respect to the front window 3. The rear end of the front side window 8 is attached to the front pillar 2 via a sealing material 33.

  A window frame 35 for supporting the front side window 8 is provided along the front end of the front side window 8. The window frame 35 has a substantially L-shaped cross section and extends vertically, and the front side window 8 is attached to one flange via a sealing material 36.

  A weather strip 41 for waterproofing the space between the front side window 8 and the front window 3 is attached to the other flange of the window frame 35.

  The weather strip 41 has a U-shaped cross section and extends up and down, and is assembled with the flange of the window frame 35 sandwiched therebetween. The weather strip 41 is formed integrally with the assembly 42 and the assembly 42 and the front window. 3 and a hollow seal portion 43 sandwiched between the left and right end portions.

  In the present embodiment, as shown in FIG. 4, the window frame 35 and the weather strip 41 are arranged so as to overlap each other when viewed from the passenger in the cab 1. That is, the window frame 35 and the weather strip 41 are arranged so that the projected area from the eye point E set in the cab 1 to the front corner of the cab 1 is minimized.

  Returning to FIG. 1, a front roof window 45 is provided between the roof 7 and the front window 3. The rear end of the front roof window 45 is attached to the front end of the roof 7 by bonding or the like, and a weather strip for waterproofing between the front roof window 45 and the front window 3 is attached to the front end of the front roof window 45 (see FIG. (Not shown) is attached.

  Next, the operation of the cab structure of this embodiment will be described.

  First, the opening and closing of the upper front window 25 will be described with reference to FIGS.

  As shown in FIG. 6, when the upper front window 25 is in the closed position, the upper roller 31 is positioned at the front end of the upper window rail 17 and the lower roller 32 is positioned at the front end of the slide guide portion 22 of the lower window rail 18. To do.

  When the upper front window 25 opens from this closed position, first, the upper roller 31 moves rearward along the upper window rail 17, and the lower roller 32 moves rearward along the slide guide portion 22 of the lower window rail 18. To do. Thereby, the upper front window 25 moves to the inside of the cab rearward as a whole.

  Next, the lower roller 32 moves upward along the rotation guide portion 21 of the lower window rail 18, and the upper roller 31 moves rearward along the upper window rail 17. As a result, the upper front window 25 rotates upward on the lower roller 32 side with the upper roller 31 moving rearward (see FIG. 7).

  Thereafter, as shown in FIG. 8, when the lower roller 32 moves to the upper end of the lower window rail 18 and the upper roller 31 moves to the rear end of the upper window rail 17, the upper front window 25 is in the open position. .

  Note that the upper front window 25 is closed in the order of FIGS. 8 to 6, contrary to the opening.

  Next, the front view of the cab 1 will be described with reference to FIGS. 4 and 18.

  As shown in FIG. 4, in the cab structure of this embodiment, the front pillar 2 is provided at a predetermined distance behind the front end of the cab 1, so the blind spot D in the forward field of view from the eye point E is a dotted line in FIG. 4. As shown in FIG. 8, only the window frame 35 and the weather strip 41 are used. Here, since the window frame 35 is not a strength member that ensures the strength of the cab 1 like the front pillar 2, the window frame 35 is formed thinner than the front pillar 2.

  On the other hand, as shown in FIG. 18, in the conventional cab structure, the front pillar 72 is arranged at the front end of the cab 71, so the blind spot D (shown by the dotted line in FIG. 18) Compared with the cab structure of this embodiment, it will become big.

  As described above, the cab structure of the present embodiment is a combination of the conventional pillar, the pillar as the strength and rigidity member of the cab 1, the pillar as the rail of the front window 3, and the weather strip 41 of the front window 3. Like the pillar, the front pillar 2 can be provided rearward by disassembling each function and assembling the weather strip 41 for the front window 3 to the front side window 8 (side glass).

  That is, the front side window 8 is provided at the front portion of the cab 1, the front pillar 2 is provided behind the cab 1, the rotation guide portion 21 of the lower window rail 18 is provided along the front pillar 2, and the front pillar 2 is moved forward from the front pillar 2. By providing the slide guide portion 22 so as to protrude to the front, a structure in which the window rail 4 (lower window rail 18) does not interfere with the front view is possible.

  Further, in the present embodiment, as shown in FIG. 6, the front header 10 is also provided rearward along with the front pillar 2, so that the upper field of view is improved as compared with the conventional cab structure (see FIG. 16). That is, in the present embodiment, the front roof window 45 is disposed at the position of the front header of the conventional cab structure, so that the field of view of the upper front end of the cab 1 can be secured.

  As a result, according to the cab structure of the present embodiment, the forward view and the upward view can be dramatically improved.

  In addition, the size of the front pillar 2 that forms a structural member for protecting an occupant in the event of a fall without impairing visibility, and the front pillar 2 and other strength members (floor cross member, front header 10, etc.) The rib shape installation which connects can be implemented, and the strength improvement of the cab 1 can be aimed at.

  Thus, the cab structure of the present embodiment can achieve both a wide forward field of view and sufficient strength.

  In the above-described embodiment, the window frame 35 for supporting the front side window 8 is provided. However, the present invention is not limited to this, and the window frame 35 may be omitted. In this case, it is conceivable that the weather strip 41 is directly attached (fitted) to the front end of the front side window 8 as shown in FIG.

  As shown in FIG. 10, a roof cover 46 integrated with the front roof window is provided on the roof 7, and the rear end of the roof cover 46 is hinged by hinges 47, 47 so that the roof cover 46 can be opened and closed. It is also conceivable to support it so that it can pivot up and down.

  In the above-described embodiment, the left and right front pillars 2 and 2 are separated from the rear of the front window 3, but only one of them may be provided.

  For example, in the small cab 1, if both the front pillars 2, 2 are separated rearward, the opening of the door 6 may be narrowed and the boarding / exiting property may be deteriorated.

  Therefore, as shown in FIG. 11, the door-side front pillar 51 is provided at substantially the same front-rear position as the front window 3, and the door-side lower pillar 52 is attached to the door-side front pillar 51. The front pillar 2 on the opposite side of the door 6 is provided to be separated rearward from the front window 3, and the front pillar 2 that is separated rearward is provided on the door 6 via a rail bracket 16 that extends forward from the front pillar 2. The lower window rail 53 on the opposite side may be provided at the same front-rear position as the lower window rail 52 on the door side.

  Specifically, it is conceivable that an intermediate rail bracket (not shown) is provided between the upper and lower rail brackets 15 and 16 of the front pillar 2 and the rotation guide portion 22 of the lower window rail 52 is supported by the intermediate rail bracket.

[Second Embodiment]
Next, a second embodiment will be described based on FIG. 12 and FIG. In the second embodiment, the open / close structure of the front window 3 is mainly different from that of the modification example of FIG. Therefore, the same elements as those shown in the modified example of FIG.

  As shown in FIG. 12, in this embodiment, a door 6 for getting on and off is provided on the left side surface of the cab 1, and the front pillar 51 on the door side is substantially the same as the front window 3 (upper front window 55). It is provided in the front-rear position. On the other hand, as shown in FIG. 13, the front pillar 2 on the side opposite to the door 6 is provided so as to be spaced rearward from the front window 3.

  The cab structure of the present embodiment includes left and right locking members provided at the lower end of the upper front window 55 so that the upper front window 55 can be opened up from the lower end side to the inside of the cab 1 with the upper end as a fulcrum. Left and right hinge members 57 (only the hinge member opposite to the door is shown) for rotatably supporting the upper end of the upper front window 55 and the lower end of the upper front window 55 are locked in the closed position. Left and right closed lock engaging members 58 and 59 (see FIG. 14) and left and right open lock engaging members 60 and 60 for locking the lower end of the upper front window 55 in the open position are provided.

  A left side (door side) hinge member (not shown) is provided on the upper part of the front pillar 51 on the door side, and a right side (opposite side to the door 6) hinge member 57 is provided on the upper side of the front pillar 2 on the opposite side of the door 6. The door is provided at the same front-rear position as the door-side hinge member 56 via a hinge stay 61 extending forward from the front pillar 51.

  As shown in FIG. 14, the closing lock engaging members 58, 59 are provided with a closing lock engaging member 58 on the door side at the lower part of the front pillar 51 on the door side, and the closing lock engagement on the side opposite to the door 6. The member 59 is provided in the lower part of the front pillar 2 on the side opposite to the door 6 through the lock stay 63 extending forward from the front pillar 51 at the same front-rear position as the door-side closed lock engaging member 58.

  The open lock engaging members 60, 60 are provided at the upper rear part of the left and right inner surfaces of the cab, for example, the inner surfaces of the roof rail RH and the roof rail LH.

  The lock member of the upper front window 55 is provided at the lower end of the roller frame 30 and is formed so as to be able to engage with the closed lock engaging members 58 and 59 and the open lock engaging member 60.

  Also in this embodiment, the same effect as the above-described embodiment can be obtained.

  In the second embodiment, only the right front pillar is disposed rearward. However, the present invention is not limited to this, and both the left and right front pillars may be disposed rearward of the upper front window 55.

  In that case, the cab structure is provided on the upper part of the front pillar 2 via the hinge stay 61, and the left and right hinge members 56 and 56 for rotatably supporting the upper end of the upper front window 55, and the lower part of the front pillar 2 are provided. Left and right closing lock engaging members 58 and 58 for locking the lower end of the upper front window 55 in the closed position, and upper rear windows provided in the upper part of the cab. It is preferable to include left and right closed lock engaging members 60, 60 for locking the lower end of 55 in the open position.

FIG. 1 is a schematic perspective view of a cab structure according to an embodiment of the present invention. FIG. 2 is a view in the direction of the arrow II in FIG. 3 is a view in the direction of the arrow III in FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. FIG. 5 is a schematic perspective view of the weather strip according to the first embodiment. 6 is a cross-sectional view taken along line VI-VI in FIG. 1 and shows a closed position of the upper front window. FIG. 7 is a diagram for explaining opening and closing of the upper front window according to the first embodiment, and shows the way of opening and closing. FIG. 8 is a diagram for explaining opening and closing of the upper front window according to the first embodiment, and shows an open position. FIG. 9 shows a modification of the weather strip according to the first embodiment. FIG. 10 shows a modification of the roof according to the first embodiment. FIG. 11 shows a modification of the cab structure according to the first embodiment. FIG. 12 is a side view of the cab structure according to the second embodiment. FIG. 13 is a longitudinal sectional view of the cab structure according to the second embodiment. FIG. 14 is a cross-sectional view of the cab structure according to the second embodiment. FIG. 15 is a schematic perspective view of a conventional cab structure. FIG. 16 is a longitudinal sectional view of a conventional cab structure. FIG. 17 is a detailed view of a pillar having a conventional cab structure. FIG. 18 is a cross-sectional view of a conventional cab structure.

Explanation of symbols

1 Cab 2 Front Pillar 3 Front Window 4 Window Rail 8 Front Side Window 41 Weather Strip

Claims (8)

Left and right front pillars that are provided at the front of the cab of the construction machine and extend vertically to form a strength member, and the front that is disposed between the front pillars and covers the front of the cab and can be opened from the front to the inside of the ceiling In a cab structure with a window,
A cab structure, wherein at least one of the front pillars is provided rearwardly from the front window, and a front side window is provided between the front pillar and the front window.   A door for getting on and off is provided on either the left or right side of the cab, and the front pillar on the door side is provided at substantially the same front and rear position as the front window, while the front pillar on the opposite side of the door is provided. The cab structure according to claim 1, wherein the cab structure is provided to be spaced rearward from the front window.   Left and right upper window rails that are arranged inside the ceiling and extend forward and backward, guide the upper end of the front window, and vertically extend along the front pillar, and guide the lower end of the front window The cab structure according to claim 1, further comprising left and right lower window rails. Left and right upper window rails that are arranged inside the ceiling and extend in the front-rear direction to guide the upper end portion of the front window, and left and right lower window rails that extend in the upper and lower directions and guide the lower end portion of the front window With
The lower window rail on the door side is attached to the front pillar on the door side, and the lower window rail on the opposite side to the door has a rail bracket extending forward from the front pillar on the front pillar spaced apart on the rear side. The cab structure according to claim 2, wherein the cab structure is provided at the same front-rear position as the lower window rail on the door side.   4. An upper roller capable of rolling on the upper window rail is provided at an upper end portion of the front window, and a lower roller capable of rolling on the lower window rail is provided at a lower end portion of the front window. Or the cab structure of 4. Left and right locking members provided on the front window;
Left and right hinge members for pivotally supporting the upper end of the front window, provided on the upper portion of the front pillar via a hinge stay extending forward from the front pillar,
Left and right closed lock engagement provided at a lower portion of the front pillar via a lock stay extending forward from the front pillar to engage the lock member of the front window and lock the front window in a closed position. Members,
2. The cab according to claim 1, further comprising: left and right open lock engaging members that are provided above a rear portion of the cab and engage with a lock member of the front window to lock the front window in an open position. Construction. Left and right locking members provided on the front window;
A hinge member provided at the upper part of the front pillar on the door side for rotatably supporting the upper end of the front window, and a hinge stay extending forward from the front pillar on the upper part of the front pillar on the opposite side of the door. Through the hinge member for pivotally supporting the upper end of the front window, provided at the same front-rear position as the hinge member on the door side,
A closed locking engagement member provided at a lower portion of the door-side front pillar for engaging the locking member of the front window to lock the front window in a closed position; and a front pillar on the opposite side of the door A lock stay extending forward from the front pillar is provided at the same front and rear position as the door side closing lock engaging member, and is engaged with the front window locking member to close the front window. A closed lock engaging member for locking at
3. The cab according to claim 2, further comprising left and right open lock engaging members provided on a rear upper portion in the cab and engaged with a lock member of the front window to lock the front window in an open position. Construction. A window frame for supporting the front side window is provided along the front end of the front side window, and a weather strip for waterproofing between the front side window and the front window is provided on the window frame. And
The cab structure according to any one of claims 1 to 7, wherein the window frame and the weather strip are arranged so as to overlap each other when viewed from an occupant in the cab.

Images