JP2017071362A - Roof structure of construction machine cab - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a roof structure of a construction machine cab which secures ROPS strength of the cab when a roof of the cab receives a lateral force from a vehicle width direction during overturning and achieves a high indoor height and a low overall height.SOLUTION: The roof structure of a construction machine cab includes: a roof panel 5 serving as an exterior upper plate of a construction machine cab 1; a beam 4 disposed on a lower surface of the roof panel 5 and arranged along a vehicle width direction; a laying material 12 which is laid along a vehicle body fore and aft direction so as to cross the beam 4 and formed by at least one of a wire harness 11 and a washer hose 8; and a roof pad 13 which is disposed below the laying material 12 and the beam 4 and serves as an interior material. A cutout part 14 is provided at a center of the beam 4 when viewed in the vehicle width direction, and the laying material 12 is disposed at the cutout part 14 along the vehicle body fore and aft direction.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a cab roof structure of a construction machine (hereinafter referred to as a construction machine) such as a wheel loader or a hydraulic excavator. In particular, when the roof receives a lateral force from the vehicle width direction during rollover, the strength of the cab is maintained. The present invention relates to a roof structure of a construction machine cab that can increase the indoor height and reduce the overall height.

  As shown in FIG. 1, a cab 1 of a construction machine such as a wheel loader or a hydraulic excavator has a seat belt in the cab 1 when the construction machine rolls over and the cab 1 receives a lateral force W from the vehicle width direction. A so-called ROPS (Roll Over Protective Structure) structure is employed to secure a living space for the operator with a mark. The ROPS strength is defined in Japanese Industrial Standard (JIS) and International Standard (ISO).

  In order to ensure the ROPS strength, the frame of the construction machine cab 1 generally includes left and right pillars 2 spaced in the vehicle width direction, and left and right roof rails extending in the longitudinal direction of the vehicle body at the tops of these pillars 2, respectively. 3 and a beam 4 extending in the vehicle width direction so as to connect the left and right roof rails 3 to each other, and when viewed from the front, the left and right pillars 2 and the beam 3 connecting the tops thereof are connected to the gate. It constitutes the mold frame structure.

  According to this structure, when the construction machine rolls over and the roof (roof panel 5) of the cab 1 receives a lateral force W from either the left or right in the vehicle width direction, the force is transmitted through the beam 4 in the vehicle width direction. By being transmitted to the other of these, the deformation | transformation of the cab 1 is suppressed and the operator's living space in the cab 1 can be ensured.

  Incidentally, the cab 1 of the construction machine is equipped with a wiper 6, and a washer liquid is supplied from a washer tank 7 to a washer nozzle of the wiper 5. The washer tank 7 is disposed below the cab 1, and the washer hose 8 extends upward from the washer tank 7 along the pillar 2 of the cab 1, and then the roof panel 5 extends to the washer nozzle of the wiper 6. Arranged on the lower surface.

  Further, the cab 1 of the construction machine is equipped with a lighting device such as a working lamp 9 or a Patlite (registered trademark) (not shown). In order to light them, a wiring harness (hereinafter referred to as a wire harness, omitted in FIG. 1) is used in the room. ) Is laid. The power supply connector 10 for the lighting device is disposed below the cab 1, and the wire harness extends upward along the pillar 2 from the connection connector 10, and then the lower surface of the roof panel 5 to the working lamp 9. The route is substantially the same as that of the washer hose 8.

  These wire harness and washer hose 8 (hereinafter also referred to as laying material) are disposed on the lower surface of the roof panel 5 across the beam 4 described above, which is an important strength member for ensuring ROPS strength. Become.

JP-A-10-167116 JP 2010-264780 A

  However, as shown in FIG. 1, if a laying material such as the washer hose 8 is disposed so as to cross the lower side of the beam 4, the beam 4 and the washer hose 8 are overlapped vertically. For this reason, if a roof pad (interior material, omitted in FIG. 1) is attached to the lower surface of the roof panel 5 so as to cover them, the height of the roof pad is lowered, and the indoor height of the cab 1 is lowered. . Therefore, the working space of the operator who works in the cab 1 is narrowed, leading to a decrease in the working environment.

  If the overall height (outdoor height) of the cab 1 is increased by the dimension that the beam 4 and the washer hose 8 etc. overlap vertically, the indoor height will not decrease, but the overall height of the construction equipment is regulated by regulations. In addition, there are restrictions on the total height including the trailer when transporting by trailer, so it cannot be raised to the dark clouds. When the total height of the current cab 1 is the upper limit of the regulations, a decrease in the indoor height is inevitable.

  If the shape of the roof pad is improved so that the portion where the beam 4 and the washer hose 8 and the like overlap vertically is accommodated in the vicinity of the roof rail 3, the indoor height can be secured without increasing the overall height. In this case, it is necessary to use the roof pad as a molded product, and an increase in cost is inevitable in terms of manufacturing cost and mold investment.

  If a notch is formed in the beam 4 and the washer hose 8 or the like is disposed so as to cross the beam 4 in the notch, the indoor height is not lowered or the overall height is not increased. However, since the beam 4 is an important strength member for securing the ROPS strength (a member that transmits the lateral force W received by the cab 1 in the rollover in the vehicle width direction), the bending moment generated in the beam 4 by the lateral force W If a notch is formed in a portion where the width of the cab 1 increases, when the cab 1 receives a lateral force W during rollover, the beam 4 is bent greatly at the notch, and the lateral force W is appropriately applied to the other in the vehicle width direction. The predetermined ROPS strength cannot be ensured.

  In addition, Patent Literature 1 is known as “Wire Harness Arrangement Structure in Automobile Roof”, and Patent Literature 2 is known as “Cab in Construction Machine”. This is a technique in which the number of fixing points is reduced to reduce the amount of harness fixing tape used, and is not directly related to the present invention.

  The object of the present invention created in view of the above circumstances is a roof structure of a construction machine cab such as a wheel loader or a hydraulic excavator, and when the roof receives a lateral force from the vehicle width direction during a rollover, An object of the present invention is to provide a roof structure for a construction machine cab capable of increasing the indoor height and reducing the overall height while ensuring the ROPS strength.

  According to the present invention created to achieve the above-described object, a roof panel that is an outer upper plate of the construction machine cab, a beam that is disposed on the lower surface of the roof panel along the vehicle width direction, and crosses the beam. Thus, a building comprising a laying material comprising at least one of a wire harness and a washer hose laid along the longitudinal direction of the vehicle body, and a roof pad as an interior material disposed under the laying material and the beam A roof structure for a construction machine cab, characterized in that a notch is provided in the center of the beam in the vehicle width direction, and a laying material is disposed along the longitudinal direction of the vehicle body in the notch. Is done.

  In the roof structure of a construction machine cab according to the present invention, a beam is a horizontal plate portion that connects a pair of vertical plate portions extending in the vehicle width direction at intervals in the longitudinal direction of the vehicle body and the lower ends of the vertical plate portions. The notch is formed in the vertical plate instead of the horizontal plate of the groove mold, and the horizontal plate of the groove mold is continuously cut in the vehicle width direction without being cut by the notch. It may be formed.

  In the roof structure of the construction machine cab according to the present invention, the beam notch is provided with a mounting bracket formed in a bowl shape along the longitudinal direction of the vehicle body, and the laying material is disposed inside the mounting bracket. You may set up.

The construction machine cab roof structure according to the present invention can exhibit the following effects.
(1) A beam is arranged on the lower surface of the roof panel in the vehicle width direction, a notch is provided in the beam, and a laying material such as a wire harness or a washer hose is passed through the notch. Even if arranged, the vertical dimension of the laying material is not added to the vertical dimension of the beam. Therefore, the height of the roof pad as an interior material disposed below the laying material and the beam can be increased, and the indoor height can be increased without increasing the overall height.
(2) The center of the beam in the vehicle width direction where the notch is provided is a straight shape with a very small bending moment according to simulations and experiments when the construction machine rolls over and the beam receives lateral force from the vehicle width direction. It is the part that is kept. For this reason, even if a notch is provided in this part (the center in the vehicle width direction of the beam) and a laying material such as a wire harness or a washer hose is passed there, there is little problem with the ROPS strength, and the ROPS strength necessary for the cab can be secured. .
(3) In short, according to the roof structure of a construction machine cab according to the present invention, when the roof receives a lateral force from the vehicle width direction during rollover, the indoor height is increased while ensuring the ROPS strength of the cab, and , The overall height can be lowered.

It is a perspective view of a construction machine cab. It is the perspective view which looked up the roof structure of the construction machine cab which concerns on one Embodiment of this invention from diagonally downward. It is a disassembled perspective view of the roof structure of the construction machine cab shown in FIG. (A) is a front view which shows the frame of the construction machine cab provided with the roof structure shown in FIG. 2, (b) is the elements on larger scale of (a). It is explanatory drawing which shows a mode that the flame | frame of the construction machine cab shown to Fig.4 (a) deform | transforms when receiving lateral force from a vehicle width direction.

  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.

(Construction machinery cab 1)
FIG. 1 shows a cab 1 of a construction machine (wheel loader) to which the construction machine cab roof structure according to the present embodiment is applied. In addition to the wiper 6, a lighting device such as a working lamp 9 is provided at the front of the construction machine cab 1. The washer nozzle of the wiper 6 is connected to a washer tank 7 disposed at the lower rear portion of the cab 1 by a washer hose 8, and an illumination device such as a working lamp 9 is connected to a power supply connector (main book) disposed at the lower rear portion of the cab 1. Machine connection connector) 10 and a wire harness (omitted in FIG. 1).

  As shown in FIGS. 1 and 2, the washer hose 8 extends upward from the washer tank 7 along the pillar 2 on the rear side of the cab 1, and then extends to the center in the vehicle width direction. Is extended forward to the washer nozzle of the wiper 6. The wire harness 11 (see FIG. 2) extends upward from the power supply connector 10 along the pillar 2 on the rear side of the cab 1, extends to the center in the vehicle width direction, and works along the lower surface of the roof panel 5. It extends forward to the ramp 9 and is bundled with the washer hose 8 and disposed in substantially the same route. Both the washer hose 8 and the wire harness 11 (hereinafter also referred to as the laying material 12) may be disposed, but only one of them may be disposed as necessary.

(Roof structure)
FIG. 2 is a perspective view of the roof structure of the construction machine cab 1 according to the present embodiment as viewed from obliquely below, and FIG. 3 is an exploded view of the roof structure. In the figure, arrow F indicates the front of the vehicle body and arrow R indicates the rear. This roof structure includes a roof panel 5 serving as an outer upper plate of the construction machine cab 1, a beam 4 disposed along the vehicle width direction on the lower surface of the roof panel 5, and a vehicle body longitudinal direction so as to cross the beam 4. A laying material 12 composed of at least one of a wire harness 11 and a washer hose 8 laid along, and a roof pad 13 as an interior material disposed below the laying material 12 and the beam 4; A notch 14 is provided at the center of the beam 4 in the vehicle width direction, and a laying material 12 is disposed in the notch 14 along the longitudinal direction of the vehicle body.

  In the present embodiment, two beams 4 are arranged at intervals in the longitudinal direction of the vehicle body as shown in FIG. 3, but may be one or three or more. As shown in FIG. 2, a front header 16 formed in the shape of a square pipe is disposed along the vehicle width direction at the front surface of the lower surface of the roof panel 5. The roof rails 3 are respectively attached to both ends of the front header 16 and the beam 4 in the vehicle width direction. The roof rail 3 is formed in a square pipe shape and extends along the longitudinal direction of the vehicle body.

(Pillar 2)
As shown in FIGS. 2 and 4, the pillar 2 is attached to the lower surface of the roof rail 3. The pillar 2 extends in the vertical direction, and includes an A pillar 2 </ b> A provided at a front pillar portion of the cab 1 shown in FIG. 1 and a B pillar 2 </ b> B provided at a center pillar portion of the cab 1. As shown in FIG. 2, a front header 16 is disposed at the position of the A pillar 2A, and a rear beam 4 is disposed at the position of the B pillar 2B.

  The frame of the construction machine cab 1 includes left and right pillars 2 that are spaced apart in the vehicle width direction, left and right roof rails 3 that extend in the vehicle body front-rear direction at the tops of the pillars 2, and left and right roof rails 3. And a beam 4 extending in the vehicle width direction so as to connect the left and right pillars 2 when viewed from the front as shown in FIG. It has a frame structure.

(Beam 4)
As shown in FIGS. 2 and 3, the beam 4 includes a pair of vertical plate portions 4a extending in the vehicle width direction at intervals in the longitudinal direction of the vehicle body and a horizontal plate portion connecting the lower ends of the vertical plate portions 4a. 4b and a channel mold material (channel material). In the beam 4, the upper end of the vertical plate portion 4 a is bonded to the lower surface of the roof panel 5, and both ends in the vehicle width direction are welded to the roof rail 3. The beam 4 is a member that transmits the lateral force W (see FIG. 1) received by the cab 1 during rollover in the vehicle width direction, and is not limited to the groove-shaped member, but may be a square pipe.

(Notch 14)
As shown in FIGS. 2 to 4, a notch portion 14 is formed in the beam 4 in order to allow the laying material 12 such as the wire harness 11 and the washer hose 8 to pass therethrough. As shown in FIG. 5, when the roof rail 3 (the end in the vehicle width direction of the beam 4) receives a lateral force W, the notch 14 is disposed at a substantially central portion in the vehicle width direction of the beam 4 having the smallest bending moment. ing. Further, the notch portion 14 is formed in the vertical plate portion 4a instead of the horizontal plate portion 4b of the beam 4 (groove mold material), and the horizontal plate portion 4b of the beam 4 (groove mold material) is not cut by the notch portion 14. It is in a continuous state in the vehicle width direction. Thereby, the intensity | strength fall of the beam 4 by the notch part 14 is suppressed.

(Arrangement bracket 17)
As shown in FIGS. 2 to 4, the notch 14 of the beam 4 is provided with a mounting bracket 17 formed in a hook shape along the longitudinal direction of the vehicle body. The laying material 12 (wire harness 11, washer hose 8) is disposed. The mounting bracket 17 has a bowl-like shape (channel) from a pair of vertical plate portions 17a extending in the longitudinal direction of the vehicle body with an interval in the vehicle width direction and a horizontal plate portion 17b connecting the lower ends of the vertical plate portions 17a. Formed).

  In accordance with the shape of the wiring bracket 17, the notch 14 provided in the beam 4 is formed in a rectangular shape, and the wiring bracket 17 is fitted and bonded to the notch 14. The wiring bracket 17 serves as a reinforcing member for applying the notch portion 14. A wire harness 11 disposed inside the wiring bracket 17 has one end connected to the power supply connector 10 shown in FIG. 1 and the other end connected to a lighting device such as a working lamp 9 or a patrol light (not shown). Has been. The washer hose 8 has one end connected to the washer tank 7 and the other end connected to the washer nozzle of the wiper 6. The wire harness 11 and the washer hose 8 are bundled as shown in FIGS.

(Action / Effect)
According to the roof structure of the construction machine cab according to the present embodiment, as shown in FIGS. 2 and 3, the beam 4 is arranged in the vehicle width direction on the lower surface of the roof panel 5, and the notch 14 is provided in the beam 4. Since the laying material 12 such as the wire harness 11 and the washer hose 8 is passed through the notch portion 14, even if the laying material 12 is disposed so as to cross the beam 4, the vertical dimension of the laying material 12 is the vertical dimension of the beam 4. Is not added. Therefore, the height of the roof pad 13 as the interior material disposed below the laying material 12 and the beam 4 can be increased, and the indoor height can be increased without increasing the overall height.

  As shown in FIG. 5, the center of the beam 4 in the width direction of the beam 4 provided with the notch 14 is, when the construction machine rolls over and the beam 4 receives a lateral force W from the width direction of the vehicle, according to simulations and experiments, It is a part that maintains a straight shape and has a very small bending moment. The broken line X in FIG. 5 shows how the frame (beam 4, pillar 2) of the cab 1 is deformed when the construction machine rolls over and the beam 4 receives a lateral force W from the vehicle width direction.

  As shown in FIG. 5, at the center of the roof (beam 4) in the vehicle width direction (portion surrounded by the imaginary line Y), the beam 4 is hardly bent and maintains a straight shape, and the bending moment of the beam 4 is Zero or very small. For this reason, a notch 14 is provided in this portion (the center of the beam 4 in the vehicle width direction), and there is little problem in terms of ROPS strength even if the laying material 12 such as the wire harness 11 and the washer hose 8 is passed there. Secure ROPS strength.

  According to the roof structure of the construction machine cab 1 according to the present embodiment, even if the laying material 12 such as the wire harness 11 and the washer hose 8 is laid across the beam 4 which is an important strength member on the ROPS strength, While ensuring the ROPS strength necessary for the cab 1, the indoor height can be increased and the overall height can be decreased. That is, the laying material 12 such as the wire harness 11 and the washer hose 8 is arranged on the lower surface of the roof panel 5 across the beam 4 without sacrificing the indoor space of the cab 1 and without increasing the overall height of the cab 1. The ROPS strength can be secured.

  As shown in FIGS. 2, 3, and 4B, the notch 14 is formed in the vertical plate portion 4a instead of the horizontal plate portion 4b of the beam 4 (groove mold material), and the beam 4 (groove mold material). The horizontal plate portion 4b is not cut by the cutout portion 14 and is continuous in the vehicle width direction. Due to the horizontal plate portion 4b continuous in the vehicle width direction, the strength reduction of the beam 4 due to the notch portion 14 is suppressed. Also, since the notch portion 14 is fitted with a mounting bracket 17 formed in a bowl shape in accordance with the shape thereof, the mounting bracket 17 serves as a reinforcing member for applying the notch portion 14, and the beam 4 The decrease in strength is suppressed.

  More specifically, as shown in FIG. 4B, in the state where the mounting bracket 17 is fitted and bonded to the notch portion 14, the horizontal plate portion 17b of the mounting bracket 17 and the horizontal plate portion of the beam 4 are arranged. 4b overlaps, and the plate | board thickness of the member of the notch part 14 of the vehicle width direction becomes a double. Further, the vertical plate portion 17a of the mounting bracket 17 supports the inner edge (vertical inner edge) of the cutout portion 14 formed in the vertical plate portion 4a of the beam 4, and from the end of the beam 4 as shown in FIG. This is a member that transmits the input lateral force W to the horizontal plate portion 17 b of the mounting bracket 17. As a result, the mounting bracket 17 serves as a reinforcing member for the lateral force W, and a reduction in the strength of the beam 4 due to the formation of the notch portion 14 is suppressed.

  For example, an inexpensive flat plate or a two-dimensional bent shape can be used as the roof pad 13.

  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.

  The present invention can be used for a cab roof structure of a construction machine such as a wheel loader or a hydraulic excavator.

DESCRIPTION OF SYMBOLS 1 Construction machinery cab 2 Pillar 3 Roof rail 4 Beam 4a Vertical plate part 4b Horizontal plate part 5 Roof panel 8 Washer hose 11 Wire harness 12 Laying material 13 Roof pad 14 Notch part 17 Installation bracket 17a Vertical plate part 17b Horizontal plate part Y Center in the vehicle width direction

Claims (3)

A roof panel as an outer upper plate of the construction machine cab,
A beam disposed along the vehicle width direction on the lower surface of the roof panel;
A laying material comprising at least one of a wire harness and a washer hose laid along the longitudinal direction of the vehicle body so as to cross the beam;
A roof structure of a construction machine cab comprising the laying material and a roof pad as an interior material disposed below the beam,
A notch is provided in the center of the beam in the vehicle width direction,
A roof structure for a construction machine cab, characterized in that the laying material is disposed along the longitudinal direction of the vehicle body at the notch.   The beam is made of a grooved material having a pair of vertical plate portions extending in the vehicle width direction at intervals in the longitudinal direction of the vehicle body and a horizontal plate portion connecting the lower ends of the vertical plate portions, and the notch portion is The groove plate material is formed not on the horizontal plate portion but on the vertical plate portion, and the groove plate material horizontal plate portion is formed continuously in the vehicle width direction without being cut by the notch portion. The construction machine cab roof structure according to claim 1.   The mounting bracket formed in a hook shape along the longitudinal direction of the vehicle body is provided in the notch portion of the beam, and the laying material is disposed inside the mounting bracket. The roof structure of the construction machine cab according to 1 or 2.

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