JP5656465B2 - Reinforcement structure for cabs of work vehicles and construction machinery - Google Patents

Description

  The present invention relates to a reinforcing structure for a cab of a work vehicle or a construction machine.

  The cab of the work vehicle or the construction machine is required to have a roll-over protective structure (ROPS).

  Therefore, as shown in FIG. 2, in the cab 1 having a substantially rectangular planar shape, a pair of left and right front pillars 2 </ b> L and 2 </ b> R extending in the vertical direction are provided at both left and right positions of the front end of the cab 1. A pair of left and right rear pillars 3L, 3R extending in the vertical direction are provided at both left and right positions of the rear end of 1, and the upper and lower pillars 2L and 3L, and the upper ends of 2R and 3R on the same left and right sides, The left and right front pillars 2L and 2R are connected to each other via a left side member 4L and a right side member 4R that extend in the front-rear direction along the left and right side positions of the ceiling of the cab 1. And the upper and lower rear pillars 3L and 3R are respectively connected to the front and rear beam members 5 and 6 extending in the left-right direction along the front edge and rear edge of the ceiling of the cab 1 respectively. Generally connected reinforcement structure is adopted. And it is (for example, see Patent Document 1).

  By the way, in the work vehicle and the construction machine, as shown in FIG. 3, the windshield 7 provided on the front side of the cab 1A is arranged in a direction orthogonal to the front-rear direction of the cab 1A in order to ensure visibility. In some cases, a front glass 7 composed of a front glass (glass body) 8 and an oblique glass (glass oblique portion) 9 extending obliquely rearward from the positions of the right and left edges of the front glass 8 is employed. is there.

  A driver's cab 1A that employs this type of windshield 7 is provided with the windshield 7 in front of the left and right front pillars 2L and 2R, so that the planar shape of the driver's cab 1A is the left and right front pillars. It becomes a substantially hexagonal shape having a portion protruding in a trapezoidal shape to the front side of 2L and 2R. 3L and 3R in FIG. 3 are rear pillars, and the rear pillars 3L and 3R are provided at positions closer to the center in the front-rear direction of the cab 1A than the rear end of the cab 1A. (For example, refer to Patent Document 2).

  By the way, the forwarder which is a kind of high-performance forestry machine is configured to have a grapple as a work machine on the rear side of the cab, and by operating the grapple, the forwarder to the loading platform (deck) provided at the rear of the vehicle It is designed to load and unload wood.

  As in the above-mentioned forwarder, in a work vehicle equipped with a work machine on the rear side of the cab or a construction machine, a seat that can pivot in the front-rear direction or a rear-facing seat is provided in the cab, and work by the work machine is performed. In some cases, the operator can sit backward in the cab.

  In addition, the forwarder may travel in the forest, and work using the grapple may also be performed in the forest. Therefore, the upper visibility in front of and behind the cab is important.

  Therefore, for work vehicles and construction machines that require a front view of the front and rear of the cab, such as the forwarder described above, it is possible to provide skylights as large as possible at the front and rear portions of the cab ceiling. desired.

JP 2010-43412 A JP 2008-56139 A

  However, the left and right front pillars 2L and 2R and the left and right rear pillars 3L and 3R are arranged at the front end of the cab 1A as in the cab 1A in which the planar shape shown in FIG. 3 is more polygonal than a rectangle. 2 and the rear end of the left and right front pillars 2L and 2R, as well as those shown in FIG. If it is going to employ | adopt the structure which connects efficiently the upper end parts of pillar 3L and 3R via the front and rear beam members 5 and 6 extended in the left-right direction, as shown in FIG. A front beam member 5 that connects the upper ends of the left and right front pillars 2L and 2R, and a rear beam member 6 that extends in the left-right direction and connects the upper ends of the left and right rear pillars 3L and 3R, Front end (front end edge) and rear end (rear end edge) of 1A ceiling It will be placed near the center portion of the front-rear direction than. In FIG. 4, for convenience of illustration, a description of a ceiling panel that is attached to the upper side of the beam members 5 and 6 to configure the ceiling of the cab 1A is omitted (the same applies to FIG. 1 described later).

  Therefore, in order to secure a front upper view and a rear upper view of the driver's cab 1A, as shown by a two-dot chain line in FIG. 4, a portion closer to the front or rear portion of the ceiling of the driver's cab 1A. If the skylights 10 and 11 are to be provided in the door, interference with the front beam member 5 and the rear beam member 6 occurs.

  As a means for preventing the interference between the front and rear beam members 5 and 6 and the skylights 10 and 11 provided in the front portion of the ceiling of the cab 1A and the rear portion of the cab 1A as described above. The front beam member 5 and the rear beam member 6 are indicated by a one-dot chain line in FIG. 4 from a position corresponding to the upper ends of the front pillars 2L and 2R and the rear pillars 3L and 3R indicated by solid lines in FIG. As shown in FIG. 4, the center of the cab 1A is offset to the center in the front-rear direction to a position where interference with the skylights 10 and 11 provided in the front portion and rear portion of the ceiling portion of the cab 1A shown by the two-dot chain line in FIG. In this state, both ends of the front beam member 5 and the rear beam member 6 offset with respect to the front pillars 2L and 2R and the rear pillars 3L and 3R are respectively connected to the ceiling of the cab 1A. On the left and right sides of the front and rear Ra 2L and 3L, 2R and 3R each of the left and right side members 4L that the upper ends are connected to, it is conceivable to be coupled to corresponding locations of 4R.

  However, when the front and rear beam members 5 and 6 are offset with respect to the upper ends of the front pillars 2L and 2R and the rear pillars 3L and 3R as described above, a lateral load is applied. Since the twist is likely to occur and the deformation tends to be large, it is difficult to satisfy the target quality such as the overturning protection structure and it is difficult to achieve good load distribution on the left and right.

  Accordingly, in order to prevent the deformation and satisfy the target quality, the front pillars 2L and 2R and the rear pillars 3L and 3R are connected to the left and right side members 4L and 4R, and Since it is necessary to reinforce the connecting portion between the side members 4L, 4R and the front and rear beam members 5, 6 by adding a gusset (not shown) as a joint, this leads to an increase in cost and the structure becomes complicated. End up.

  Therefore, in the present invention, the planar shape of the work vehicle or construction machine is a polygonal shape rather than a rectangle, and the left and right front pillars and the left and right rear pillars are front and rear than the front end and rear end of the cab. In the driver's cab of the type provided near the center of the direction, the upper ends of the left and right front pillars and the left and right rear pillars are connected to each other with a beam member so that good load distribution can be achieved. In the state where the interference of the beam member is prevented, it is intended to provide a reinforcing structure of the cab so that skylights can be provided on the front portion and the rear portion of the ceiling portion of the cab. is there.

In order to solve the above-mentioned problems, the present invention corresponds to claim 1, and the front and right front pillars and the left and right rear pillars that can be seated forward and rearward are provided at the front end of the cab. It is located closer to the center in the front-rear direction than the front and rear end parts , and to secure a front upper view from the driver's seat when sitting forward, and the rear upper part from the driver's seat when sitting backward In order to ensure visibility, the front and rear pillars on the left and right sides of the operator 's cab of a type of work vehicle or construction machine in which skylights are formed in the front part and rear part of the cab ceiling The upper ends are connected to each other via left and right side members extending in the front-rear direction along the left and right side positions of the ceiling of the cab, and the X-shaped beam having an X-shaped planar shape is connected to the driver seat. Secures front and rear upper visibility While disposed in a position that does not interfere with skylight skylights and rear inner portion of the front inner portion of the order ceiling, inertia between those located diagonally of the front pillar and the rear pillar of the left and right of said right and left It arrange | positions so that a main axis may be tied, and it shall be the structure which connected the four edge parts of this X-shaped beam to the upper end part of each said left and right front pillar, and the upper end part of each said left and right rear pillar.

According to the reinforcing structure of a cab of the present invention, the following excellent effects are exhibited.
(1) The left and right front pillars of the cab that can be seated forward and backward, and the left and right rear pillars are located closer to the center in the front-rear direction than the front and rear ends of the cab. In addition, in order to secure a front upper view from the driver's seat when sitting forward and to secure a rear upper view from the driver's seat when sitting backward, In the cab of a work vehicle or construction machine in the form of a skylight in the rear part, the left and right sides of the front and rear pillar upper ends are aligned with the left and right sides of the cab ceiling. Connected via left and right side members that extend in the front-rear direction, and the X-shaped beam with an X-shaped planar shape is closer to the front of the ceiling to ensure front and rear upper visibility from the driver's seat Partial skylight and rear part The X-beams are arranged at positions that do not interfere with the skylight, and are arranged so as to connect the principal axes of inertia of the left and right front pillars and the left and right rear pillars that are opposite to each other. Since the end is connected to the upper end of each of the left and right front pillars and the upper end of each of the left and right rear pillars, it is possible to construct a cab for a work vehicle or construction machine that can be seated forward and rearward . The left and right front pillars positioned closer to the center in the front-rear direction than the front and rear ends and the upper ends of the left and right rear pillars can be integrally connected by an X-shaped beam. For this reason, the lateral load applied to the left and right front and rear pillars can be directly transmitted to the left and right front and rear pillars only through the X-shaped beam. Therefore, deformation due to torsion can be suppressed, and good left and right load distribution can be achieved.
(2) the front and rear of each pillar, and the structure of the left and right side members, since the conventional no particular need to modify those, equipped with a reinforcement structure of the work vehicle or construction equipment cab of the present invention In the driver's cab, it is possible to achieve efficient load distribution with respect to the side load, the rear load, and the upper load at the time of falling. Therefore, it can be set as the structure advantageous in satisfying target quality like the protection structure at the time of a fall. Furthermore, in the cab, since the crossing portion of the X-shaped beam whose plane shape is X-shaped is arranged near the center of the ceiling, the cab is located near the center of the ceiling. The strength can be increased, and an effect that is advantageous for satisfying the target quality of the falling object protection structure can be expected.
(3) Since each end part of the X-shaped beam can be connected to the upper end parts of the front pillars and the rear pillars, a gusset that is a strength member of the joint part can be efficiently arranged. . Further, the number can be suppressed, and the cost can be reduced.
(4) Since the X-shaped beam includes a space sandwiched between adjacent members on the front side and the rear side, by using this space, the X-beam is closer to the front part in the ceiling of the cab. A large skylight can be provided in a limited space between the portion and the rear portion without interfering with the X-shaped beam.
(5) Therefore, it shall be suitable for the case where skylights are provided in the front part and the rear part of the ceiling part of the cab of a work vehicle or construction machine where the front view of the front and rear of the cab is required. Can do.
(6) Further, since the X-beam, it is a configuration in which to arrange so as to connect the inertia principal axis between those located diagonally of the right and left front pillars and the right and left rear pillars of the left and right The transmission of the load via the X-shaped beam between the front and rear pillars of either one and the left and right front and rear pillars is performed better and more reliably. Can do.

It is a schematic plan view which shows one Embodiment of the reinforcement structure of the cab of this invention. It is a schematic perspective view which shows the reinforcement structure in the driver's cab where the planar shape proposed conventionally is a substantially rectangle. It is a schematic perspective view which shows the example of the cab of the form which made the planar shape conventionally proposed polygonal shape rather than a rectangle. It is a schematic plan view which shows arrangement | positioning of the beam member of the front part and rear part at the time of providing a reinforcing structure in the driver's cab of the form which makes a planar shape polygonal rather than a rectangle.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

  FIG. 1 shows an example in which the present invention is applied to a driver's cab 1B having a substantially octagonal planar shape as a polygonal planar shape rather than a rectangle as an embodiment of the cab reinforcing structure of the present invention. It is like this.

  That is, the driver's cab 1B has a planar shape that protrudes in a trapezoidal shape to the front side from the left and right front pillars 2L and 2R and a trapezoidal shape to the rear side from the left and right rear pillars 3L and 3R. It has a substantially octagonal shape with a portion.

  The front and rear pillars 2L and 3L and the upper ends of 2R and 3R on the corresponding side on the left and right are left side members 4L extending in the front-rear direction along the left and right side positions of the ceiling of the cab 1, and the right It connects via the side member 4R.

  Further, an X-shaped beam 12 having an X-shaped planar shape is formed, and the four ends of the X-shaped beam 12 are connected to the upper ends of the left and right front pillars 2L, 2R and the rear pillars 3L, Connect to the upper end of 3R.

  More specifically, the X-shaped beam 12 has a length of a long beam member 12a having a length dimension that connects either the left or right front pillar 2L or 2R and the left or right rear pillar 3R or 3L. Short beam members 12b and 12c, which are approximately half the length of the beam member 12a, are integrally connected in the same plane in the middle portion in the direction.

  Further, the X-shaped beam 12 is arranged so as to connect the principal axes of inertia of the left and right front pillars 2L and 2R and the rear pillars 3L and 3R, which are located diagonally to each other. It is assumed that it is connected to the upper end of 2R, 3L, 3R.

  13 is an auxiliary member having a trapezoidal shape in plan view attached to the front side of the left and right front pillars 2L and 2R in order to attach and support a front end portion of a ceiling panel (not shown) attached to the upper side of the X-shaped beam 12. It is an auxiliary member having a substantially trapezoidal shape in plan view attached to the rear side of the left and right rear pillars 3L, 3R in order to attach and support the rear end portion of the ceiling panel (not shown).

  Other components that are the same as those shown in FIG.

  According to the reinforcing structure of the cab of the present invention having the above configuration, the upper ends of the left and right front pillars 2L, 2R and the rear pillars 3L, 3R in the cab 1B in which the planar shape is substantially octagonal. Can be integrally connected by the X-shaped beam 12, and when a lateral load is applied from either the left or right, it acts on the left and right front and rear pillars 2L and 3L or 2R and 3R. The load can be directly transmitted to the left and right front and rear pillars 2R and 3R or 2L and 3L only through the X-shaped beam 12.

  Therefore, deformation due to torsion can be suppressed, and good left and right load distribution can be achieved.

  Moreover, since there is no need to change the structure of the front and rear pillars 2L, 2R and 3L, 3R, and the left and right side members 4L, 4R, the cab cab reinforcement structure of the present invention is provided. According to the cab 1B, it is possible to achieve efficient load distribution with respect to the side load, the rear load, and the upper load at the time of falling. Therefore, it can be set as the structure advantageous in satisfying target quality like the protection structure at the time of a fall. Furthermore, in the cab 1B, the intersection of the X-shaped beam 12 having an X-shaped planar shape is disposed near the center of the ceiling of the cab 1B. Therefore, it is possible to increase the strength near the center of the ceiling portion, and therefore, it is possible to expect an advantageous effect of satisfying the target quality of the Falling Object Protective Structures (FOPS).

  Further, each end of the X-shaped beam 12 can be connected to the upper ends of the front pillars 2L and 2R and the rear pillars 3L and 3R, so that the gussets that are strength members of the joints can be efficiently Since it can arrange | position, the number can be suppressed and cost reduction can be aimed at.

  Moreover, since the X-shaped beam 12 includes spaces sandwiched between the adjacent beam members 12a and 12b or 12a and 12c on the front side and the rear side, as shown in FIG. By using the space, the large skylights 10 and 11 can be provided in the limited space at the front portion and the rear portion in the ceiling portion of the cab 1B without interfering with the X-shaped beam 12.

  Therefore, it can be suitable for the case where skylights are provided in the front part and the rear part of the ceiling part of the driver's cab of a work vehicle or construction machine in which the front view of the front and rear of the cab is required. .

  In addition, this invention is not limited only to the said embodiment, The front pillars 2L and 2R and the rear pillars 3L and 3R are the center of the front-back direction rather than the front-end part and rear-end part of the cab 1B. As long as the operator's cab of the type of work vehicle or construction machine is located closer, the planar shape as shown in FIG. 1 may be applied to a driver's cab other than the octagonal shape.

  Furthermore, only one of the front pillars 2L and 2R and the rear pillars 3L and 3R is located closer to the center in the front-rear direction than the front end and rear end of the cab 1B. It may be applied to the driver's cab.

  As long as the skylights 10 and 11 do not interfere with the X-shaped beam 12, any shape other than those illustrated may be adopted.

  The present invention may be applied to the case where the skylight 10 or 11 is provided only in either the front part or the rear part of the ceiling of the cab 1B.

  The present invention may be applied to any kind of work vehicle other than a forwarder, and a cab of a construction machine.

  Of course, various modifications can be made without departing from the scope of the present invention.

1B Driver's cab 2L, 2R Front pillar 3L, 3R Rear pillar 4L Left side member 4R Right side member 12 X-shaped beam

Claims (1)

The front pillars of the left and right of the cab which can be seated forward and backward, left and right rear pillars, with located in the front-rear direction near the center of the front end portion and the rear end portion of said cab, forward In order to secure a front upper view from the driver's seat when seated in the seat and a rear portion near the front of the cab of the driver's cab to secure a rear upper view from the driver seat when seated backward The top of the left and right pillars on the left and right sides of the operator 's cab of a work vehicle or construction machine that forms a skylight in the front and rear direction along the left and right sides of the cab ceiling The X-beams, which are connected via the left and right side members that extend, and the plane shape is X-shaped, are the skylights at the front part of the ceiling part in order to secure a front view from the driver's seat to the front and rear. And the skylight in the rear part The four ends of the X-shaped beam are arranged at positions where they do not interfere with each other, and are arranged so as to connect the principal axes of inertia of the left and right front pillars and the left and right rear pillars which are located diagonally to each other. A reinforced structure for a cab of a work vehicle or a construction machine, characterized in that a structure is connected to an upper end portion of each of the left and right front pillars and an upper end portion of each of the left and right rear pillars.

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