JP6581160B2 - Construction machinery cab structure - Google Patents

Description

  The present invention relates to a cab structure for a construction machine such as a hydraulic excavator or a hydraulic crane, and more particularly to a cab structure for a construction machine that improves the rear field of view while ensuring the cab rigidity when the vehicle body rolls over.

  The cab structure of construction machines must satisfy the “Earth Machine Protective Structure for Rolling Over Protective Structure” (JISA8910) called ROPS (Roll Over Protective Structure) specified by ISO. ROPS is a standard for securing the driver's living space in the cab when the construction machine rolls over and the cab is deformed. The load is applied to the cab when the construction machine rolls over, A predetermined load (side load X, upper load Z, rear load Y) is applied to the vehicle in the lateral direction (vehicle width direction), vertical direction, and front-rear direction (see FIG. 1 (a)) and survives in the deformed cab. Inspect whether space is reserved. Depending on the vehicle type of the construction machine, a forward load Y1 (see FIG. 8) is applied instead of the rear load Y, and the order in which the loads (X, Z, Y) are applied differs depending on the vehicle type.

  In order to increase the rigidity of the cab so as to satisfy such ROPS, the cab structure J of the conventional construction machine has two corners on the front side of the rectangular floor panel 1 as shown in FIGS. 1 (a) and 1 (b). The front pillar 2 is erected, the rear pillar 3J is erected at the two rear corners, the front header 4 is provided to bridge the upper ends of the left and right front pillars 2, and the upper ends of the left and right rear pillars 3J are laid. A rear header 5 is provided, and a roof rail 6 is provided to bridge the upper end of the front pillar 2 and the upper end of the rear pillar 3 to form a substantially hexahedral box shape (see Patent Document 1).

JP 2017-114219 A JP 2008-195234 A JP 2005-35473 A

  According to the cab structure J of the conventional construction machine shown in FIG. 1 (a), since the structural members (each pillar, etc.) have a space frame structure (cage structure), the rigidity satisfying ROPS can be secured. Since the rear pillar 3J is erected substantially vertically at two corners on the rear side of the cab and its upper end is connected to the rear end of the roof rail 6, the rear pillar prevents the driver from seeing diagonally backward. 3, the rear viewing angle θJ between the rear pillars 3J viewed from the eye point of the driver D is limited, as indicated by a virtual line (dashed line).

  That is, in the cab structure J of the conventional construction machine, as shown in FIG. 1 (b), the pillars are formed so as to cover the rear pillar 3J between the window glass 7 on the side surface of the cab and the window glass 8 on the rear surface of the cab. Although the outer plate 9 is provided, the pillar outer plate 9 does not hinder the view, but the inner rear pillar 3J itself hinders the view.

  As a conventional technique, Patent Document 2 discloses an improvement in the forward view of the construction equipment cab, and Patent Document 3 discloses an improvement in the upward view of the construction equipment cab. However, these are irrelevant to the improvement of the rear view of the construction machine cab, and the technical premise is different from the present invention.

  An object of the present invention, which was created in view of the above circumstances, is to provide a cab structure for a construction machine in which the rear view angle between the left and right rear pillars is widened while securing the cab rigidity when the vehicle rolls over.

According to the present invention created to achieve the above-described object, the left and right front pillars spaced in the vehicle width direction and the upper ends of the front pillars are connected to the vehicle body and extend rearward in the longitudinal direction. A cab structure of a construction machine having left and right roof rails and left and right rear pillars connected to each roof rail, wherein the rear pillar is inclined forward in the vehicle longitudinal direction, and the upper end of the rear pillar is in the vehicle longitudinal direction of the roof rail. A roof reinforcement that transmits the force in the vehicle width direction applied to one roof rail to the other roof rail is attached to the middle of the vehicle body in the longitudinal direction of the left and right roof rails. on the sides, so as to include the left and right rear pillars, to characterized in that the transparent window glass rather than the outer plate blocks the view are disposed Cab structure of the construction machine is provided.

  The cab structure for a construction machine according to the present invention has a rear header that bridges the rear end portions of the left and right roof rails, and the roof reinforcement has a vehicle middle in the vehicle longitudinal direction of one roof rail and a vehicle width of the rear header. The member that bridges the middle in the direction and the member that bridges the middle in the vehicle longitudinal direction of the other roof rail and the middle in the vehicle width direction of the rear header may be configured in a V shape in plan view.

  In the cab structure for a construction machine according to the present invention, a first gusset for increasing the connection rigidity may be provided at a connection portion between the upper end portion of the rear pillar and the center of the roof rail in the longitudinal direction of the vehicle body.

  In the cab structure for a construction machine according to the present invention, a second gusset for increasing connection rigidity may be provided at a connection portion between the upper end portion of the rear pillar and the end portion in the vehicle width direction of the roof reinforcement.

  In the cab structure for a construction machine according to the present invention, a rear cross member may be bridged in the middle in the height direction of the left and right rear pillars and below the lower end of the window glass.

The construction machine cab structure according to the present invention can exhibit the following effects.
(1) rear pillar is inclined forward in the longitudinal direction of the vehicle body upper portion of the rear pillar is connected in the longitudinal direction of the vehicle body in the middle of the roof rail, the cab side of the cab rear surface and the left and right, the view so as to include the left and right rear pillars Since a transparent window glass is provided instead of the outer skin to be shielded, the rear viewing angle between the left and right rear pillars as viewed from the driver's eye point is widened.
(2) Since the roof reinforcement that transmits the force in the vehicle width direction applied to one roof rail to the other roof rail is installed in the middle of the left and right roof rails in the vehicle longitudinal direction, the cab rigidity when the vehicle rolls over Can be secured.

It is explanatory drawing of the cab structure of the construction machine which shows a prior art example, (a) is a frame perspective view, (b) is a cab external appearance perspective view. It is explanatory drawing of the cab structure of the construction machine which shows one Embodiment of this invention, (a) is a frame perspective view, (b) is a cab external appearance perspective view. It is explanatory drawing which shows the difference of the back view of the said embodiment, and the back view of a prior art example. It is the fragmentary perspective view which looked at the flame | frame of the cab structure which concerns on the said embodiment from diagonally downward. It is explanatory drawing which shows the 1st modification of this invention, (a) is a frame perspective view, (b) is a cab external appearance perspective view. It is explanatory drawing which shows the 2nd modification of this invention. It is explanatory drawing which shows the 3rd modification of this invention. It is explanatory drawing which shows the 4th modification of this invention. It is explanatory drawing which shows the 5th modification of this invention.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in the embodiment are merely examples for facilitating understanding of the invention, and do not limit the present invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are denoted by the same reference numerals, and redundant description is omitted, and elements not directly related to the present invention are not illustrated. To do.

(Outline of cab structure A for construction machinery)
FIG. 2A shows a frame of a cab structure A of a construction machine according to an embodiment of the present invention, and FIG. 2B shows an appearance of a cab in which an outer plate and a window glass are attached to the frame. In the figure, the left is the front in the traveling direction, and the right is the rear. The cab structure A of the construction machine according to the present embodiment includes left and right front pillars 2 that are spaced apart in the vehicle width direction, and left and right sides that are connected to the upper ends of the front pillars 2 and extend rearward in the longitudinal direction of the vehicle body. Roof rails 6 and left and right rear pillars 3 connected to the roof rails 6.

  In the cab structure A, as shown in FIG. 2 (a), the rear pillar 3 is inclined forward in the vehicle longitudinal direction, and the upper end of the rear pillar 3 is connected to the middle of the roof rail 6 in the vehicle longitudinal direction. A roof reinforcement 10 for transmitting the force in the vehicle width direction applied to one roof rail 6 to the other roof rail 6 is mounted in the middle of the roof rail 6 in the vehicle longitudinal direction. Further, as shown in FIG. 2B, window glasses 11 and 12 are disposed so as to include the left and right rear pillars 3 from the rear surface of the cab to the left and right cab side surfaces.

  The rear pillar 3 is inclined forward in the longitudinal direction of the vehicle body, and the upper end of the rear pillar 3 is connected to the middle of the roof rail 6 in the longitudinal direction of the vehicle body. Since the dough glasses 11 and 12 are disposed, as shown by a solid line in FIG. 3, the rear viewing angle θA between the left and right rear pillars 3 as viewed from the eye point of the driver D is an imaginary line (dashed line). ) Wider than the rear viewing angle θJ of the conventional example. Further, as shown in FIG. 2A, a roof reinforcement 10 that transmits a force in the vehicle width direction applied to one roof rail 6 to the other roof rail 6 in the middle of the left and right roof rails 6 in the vehicle longitudinal direction. Since it is installed, the cab rigidity when the vehicle rolls over can be secured. Hereinafter, the cab structure of the construction machine according to the present embodiment will be described in detail.

(Cab frame: front pillar 2, roof rail 6, rear pillar 3, etc.)
As shown in FIG. 2 (a), the cab frame includes a floor panel 1 including a rectangular panel body 1a and floor members 1b, 1c, 1d, and 1e mounted in a frame shape on four sides of the panel body 1a, A front pillar 2 erected at the two front corners of the panel 1, a front header 4 that bridges the upper ends of the left and right front pillars 2, and a vehicle body longitudinally extending rearward from the upper end of the front pillar 2. The roof rail 6, the rear header 5 that bridges the rear ends of the left and right roof rails 6, and extends upward from two corners on the rear side of the floor panel 1, bent forward, and in the middle of the roof rail 6 in the longitudinal direction of the vehicle body. A connected rear pillar 3 is provided. Depending on the vehicle type of the construction machine, the rear load 5 may be omitted because the front load Y1 (see FIG. 8) is applied instead of the rear load Y during the ROPS test. For example, in the case of an articulated dump, the rear header 5 can be omitted.

  The rear pillar 3 is composed of a lower rear pillar 3a extending substantially upward in the vertical direction from the floor panel 1, and an upper rear pillar 3b extending obliquely forward from the lower rear pillar 3a in the vehicle body front-rear direction, and the upper end of the upper rear pillar 3b. The portion is welded in the middle of the roof rail 6 in the longitudinal direction of the vehicle body. The rear pillar 3 is not limited to the bent shape described above, and is formed in a substantially straight shape. The lower end is welded to the corner on the rear side of the floor panel 1 and is inclined obliquely upward from the upper end. May be welded in the middle of the longitudinal direction of the vehicle body of the roof rail 6. Between the vicinity of the connection portion of the roof rail 6 to the rear pillar 3 and the floor member 1c, a door pillar 13 is bridged along the vertical direction. The door pillar 13 serves as a hinge mounting portion of the door 14 when the door 14 is opened forward, and serves as a door stop of the door 14 when the door 14 is opened rearward.

(Window glass 11, 12)
As shown in FIG. 2B, window glasses 11 and 12 are disposed so as to include the left and right rear pillars 3 from the cab rear surface to the left and right cab side surfaces. The window glass may be composed of a side window glass 11 on the side surface of the cab and a rear window glass 12 on the rear surface of the cab, or may be a U-shaped window glass formed integrally with these. . As a result, as shown by the solid line in FIG. 3, the rear viewing angle θA between the left and right rear pillars 3 as viewed from the eye point of the driver d is wider than the rear viewing angle θJ of the conventional example shown by the phantom line in FIG.

(First gusset 15)
As shown in FIGS. 2 (a) and 4, a first triangular gusset 15 having a substantially triangular plate shape is welded to the connection portion between the upper end portion of the rear pillar 3 and the middle portion of the roof rail 6 in the vehicle longitudinal direction. Has been. The first gusset 15 bows downward when the vehicle body rolls over, and when the rear load 5 is applied to the rear header 5, the rear end of the roof rail 6 deforms so as to bend upward with respect to the rear pillar 3. Suppresses the situation of deformation, and demonstrates the function of ensuring the driver's living space in the cab.

  The first gusset 15 is a dead space generated by connecting the upper end portion of the rear pillar 3 inclined forward in the middle of the roof rail 6 in the longitudinal direction of the vehicle body. The first gusset 15 is at the base of the connection portion between the rear pillar 3 and the roof rail 6. As shown in FIG. 3, the blind spot of the rear pillar 3 is seen from the eye point of the driver D and does not hinder the rear view.

(Roof Rain Force 10)
As shown in FIGS. 2A and 4, in the middle of the front and rear direction of the left and right roof rails 6, a roof reinforcement that transmits a force in the vehicle width direction applied to one roof rail 6 to the other roof rail 6. Mento 10 is attached. The roof reinforcement 10 includes a member 10a that bridges the middle of the roof rail 6 in the vehicle longitudinal direction and the middle of the rear header 5 in the vehicle width direction, the middle of the other roof rail 6 in the vehicle longitudinal direction and the rear header 5 The member 10b which bridges the middle in the vehicle width direction is configured in a V shape in plan view. The roof reinforcement 10 can ensure the head clearance of the driver D seated in the driver's seat in the cab, and can transmit the lateral load X in the vehicle width direction, thereby ensuring the cab rigidity when the vehicle rolls over.

(Second gusset 16)
As shown in FIG. 4, a second gusset 16 for increasing connection rigidity is provided at a connection portion between the upper end portion of the rear pillar 3 and the end portion in the vehicle width direction of the roof reinforcement 10. The second gusset 16 supports a side load X applied to the roof rail 6 when the vehicle rolls over, and exhibits a function of ensuring a driver's living space in the cab. That is, the second gusset 16 supports the inner corner (upper side) of the frame composed of the roof reinforcement 10, the left and right rear pillars 3, and the rear floor member 1 e so that the frame can be crushed by the side load X. Suppress deformation that collapses.

  Since the second gusset 16 is provided at the base (dead space) of the connection portion between the rear pillar 3 and the roof reinforcement 10, the rear pillar 3 is viewed from the eye point of the driver D as shown in FIG. Will not obstruct the rear view. Further, as shown in FIG. 4, a triangular gusset-shaped third gusset 17 is provided at the connecting portion between the rear pillar 3 and the floor member 1e. The third gusset 17 is also similar to the second gusset 16 in the roof rain. The inner corner (lower side) of the frame body composed of the force 10, the left and right rear pillars 3 and the rear floor member 1e is supported, and the deformation that the frame body is crushed by the side load X is suppressed. A body mount bracket (not shown) is attached to the third gusset 17.

(Rear cross member 18)
As shown in FIG. 2 (a), a rear cross member 18 is bridged in the middle of the left and right rear pillars 3 so as to be located below the lower end of the rear window glass 12. The rear cross member 18 supports the lateral load X when the vehicle body rolls over without interfering with the visibility of the window glasses 11 and 12 (see FIG. 2B) arranged from the cab side surface to the rear surface.

(Front cross member 19)
As shown in FIG. 2A, a front cross member 19 is bridged in the middle of the left and right front pillars 2 below the lower end of the front window glass. The front cross member 19 supports the side load X when the vehicle rolls over without interfering with the field of view of the front window glass.

(Action / Effect)
According to the cab structure of the construction machine according to this embodiment, as shown in FIG. 2A, the rear pillar 3 is inclined forward in the vehicle longitudinal direction, and the upper end of the rear pillar 3 is located in the vehicle longitudinal direction of the roof rail 6. As shown in FIG. 2 (b), the window glasses 11 and 12 are disposed on the rear surface of the cab and the left and right cab sides so as to contain the left and right rear pillars 3. As shown by the solid line, the rear viewing angle θA between the left and right rear pillars 3 as viewed from the eye point of the driver D is wider than the conventional rear viewing angle θJ shown by the phantom line in FIG.

  As shown in FIGS. 2A and 4, a roof reinforcement that transmits a force in the vehicle width direction applied to one roof rail 6 to the other roof rail 6 in the middle of the front and rear direction of the left and right roof rails 6. Since 10 is suspended, the cab rigidity can be ensured when the vehicle rolls over. In addition, the roof reinforcement 10 has a member 10a that bridges the middle of the roof rail 6 in the vehicle longitudinal direction and the middle of the rear header 5 in the vehicle width direction, and the middle of the other roof rail 6 in the vehicle longitudinal direction and the rear header. 5 is formed in a V-shape in plan view from the member 10b that bridges the middle in the vehicle width direction, so that it is possible to transmit the load X in the vehicle width direction while ensuring the head clearance of the driver D. The cab rigidity during rollover can be secured.

  As shown in FIGS. 2 (a) and 4, the first gusset 15 is welded to the base of the connecting portion between the upper end of the rear pillar 3 and the center of the roof rail 6 in the longitudinal direction of the vehicle body. When the rear load Y is applied to the header 5, the situation where the rear end portion of the roof rail 6 is deformed so as to bend upward with respect to the rear pillar 3 and the situation where it is deformed so as to bow downward is suppressed. The living space of the person D can be secured. The first gusset 15 becomes a blind spot of the rear pillar 3 when viewed from the eye point of the driver D, and does not hinder the rear view.

  As shown in FIG. 4, a second gusset 16 is provided at a connection portion between the upper end portion of the rear pillar 3 and the end portion in the vehicle width direction of the roof reinforcement 6. The second gusset 16 supports a side load X applied to the roof rail 6 when the vehicle body rolls over, and secures a living space for the driver D in the cab. That is, the second gusset 16 supports the inner corners of the frame composed of the roof reinforcement 10, the left and right rear pillars 3, and the rear floor member 1e, and is deformed so that the frame is crushed by the side load X. Suppress. The second gusset 16 becomes a blind spot of the rear pillar 3 when viewed from the eye point of the driver D, and does not hinder the rear view.

(First modification)
FIG. 5 shows a cab structure A1 for a construction machine according to a first modification of the present invention. The cab structure A1 of the construction machine according to the first modified example has basically the same configuration as that of the first embodiment described above. From the eye point of the driver D shown in FIG. 3 on the cab rear surface and the left and right cab side surfaces. Except for the blind spots of the left and right rear pillars 3 when viewed, the window glasses 11a, 11b, and 12 are arranged, which is different from the first embodiment. That is, the pillar outer plate 20 is provided on the side of the cab along the blind spot of the rear pillar 3 as viewed from the eye point of the driver D (contrast with FIG. 2B). Also in this first modified example, the pillar outer plate 20 does not hinder the field of view as viewed from the eye point of the driver D, so that the same operational effects as the first embodiment can be exhibited. In addition, it is good also considering the front glass 11a of the cab side surface shown in FIG.5 (b) as an outer plate | board.

(Second modification)
FIG. 6 shows a cab structure A2 for a construction machine according to a second modification of the present invention. The construction machine cab structure A2 according to the second modification is basically the same configuration as the first embodiment described above, the upper part of the rear pillar 3 is bent backward, the bent portion 3x is welded to the door pillar 13, The point which welds the upper end part 3y of the rear pillar 3 to the roof rail 6 differs from 1st embodiment. In the second modification, the portion from the bent portion 3x to the upper end portion 3y of the rear pillar 3 also serves as the first gusset 15 (see FIG. 2A) of the first embodiment. Also in this second modified example, the same function and effect as in the first embodiment can be exhibited.

(Third Modification)
FIG. 7 shows a cab structure A3 for a construction machine according to a third modification of the present invention. The construction machine cab structure A3 according to the third modified example has basically the same configuration as that of the first embodiment described above, and the roof reinforcement 10 is formed in a straight shape instead of a V shape in a plan view. This is different from the first embodiment. Also in the third modified example, as in the first embodiment, it is possible to exert the effect that the rear viewing angle θA between the left and right rear pillars 3 can be widened while ensuring the cab rigidity at the time of the vehicle body rollover.

(Fourth modification)
FIG. 8 shows a cab structure A4 for a construction machine according to a fourth modification of the present invention. The cab structure A4 of the construction machine according to the fourth modification is basically the same configuration as the first embodiment described above, and instead of the rear load Y shown in FIG. Applies to vehicle types (articulated dumps, etc.) to which In the case of a vehicle type such as an articulated dump truck, a rigid carrier (vessel) is disposed behind the cab higher than the cab, so that the rear load Y is not applied to the cab when the vehicle rolls over and the front load Y1 is Join. In this case, the rear header 5 is omitted, and a fourth gusset 21 is provided at a connection portion between the roof rail 6 and the door pillar 13 instead of the first gusset 15. The fourth gusset 21 does not interfere with the rear view, and when the front load 4 is applied to the front header 4, the front end of the roof rail 6 is deformed so as to bend upward with respect to the door pillar 13 and bows downward. It suppresses the situation to deform so that the driver's living space is secured in the cab. Also in the fourth modified example, the same function and effect as the first embodiment can be exhibited.

(5th modification)
FIG. 9 shows a cab structure A5 for a construction machine according to a fifth modification of the present invention. The cab structure A5 of the construction machine according to the fifth modification has the same configuration as that of the fourth modification, and is different from the fourth modification in that the roof reinforcement 10 is a bent and integrally formed type. Also in the fifth modification, the same operational effects as in the fourth modification can be exhibited.

  The preferred embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the above-described embodiments, and various modifications within the scope described in the claims. Needless to say, the modified examples also belong to the technical scope of the present invention. Construction machines include hydraulic excavators, hydraulic cranes and the like, as well as arcuate dumpers.

  INDUSTRIAL APPLICABILITY The present invention can be used for a cab structure for a construction machine that improves the rear field of view while ensuring the cab rigidity when the vehicle rolls over.

A Construction machine cab structure 1 Floor panel 2 Front pillar 3 Rear pillar 4 Front header 5 Rear header 6 Roof rail 10 Roof reinforcement 10a Member 10b Member 11 Window glass 12 Window glass 13 Door pillar 15 First gusset 16 Second gusset 17 3rd gusset 18 Rear cross member X Side load Y Rear load Z Upper load

Claims (5)

Left and right front pillars spaced in the vehicle width direction, left and right roof rails connected to the upper end of each front pillar and extending rearward in the vehicle longitudinal direction, and left and right rear pillars connected to each roof rail A cab structure of a construction machine equipped with,
The rear pillar is inclined forward in the vehicle longitudinal direction, and the upper end of the rear pillar is connected to the middle of the roof rail in the vehicle longitudinal direction;
A roof reinforcement that transmits the force in the vehicle width direction applied to one roof rail to the other roof rail is mounted in the middle of the left and right roof rails in the longitudinal direction of the vehicle body.
A cab structure for a construction machine, characterized in that a transparent window glass is provided on the rear surface of the cab and the left and right cab sides so as to enclose the left and right rear pillars, instead of an outer plate that blocks the view. A rear header that bridges the rear ends of the left and right roof rails;
The roof reinforcement is a member that bridges the middle of the vehicle body in the longitudinal direction of one roof rail and the middle of the vehicle in the vehicle width direction of the rear header, the vehicle longitudinal direction of the other roof rail and the vehicle width direction of the rear header. The cab structure for a construction machine according to claim 2, wherein the cab structure is constructed in a V shape in plan view from a member that bridges the middle.   3. The cab structure for a construction machine according to claim 1, wherein a first gusset for increasing connection rigidity is provided at a connection portion between an upper end portion of the rear pillar and a middle portion of the roof rail in the longitudinal direction of the vehicle body. .   The second gusset for increasing connection rigidity is provided at a connection portion between an upper end portion of the rear pillar and an end portion in the vehicle width direction of the roof reinforcement. The construction machine cab structure described in 1.   5. The rear cross member is laid across the middle of the left and right rear pillars in the height direction below the lower end of the window glass. 6. The construction machine cab structure described in 1.

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