JP2010090567A - Cab structure of utility machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cab structure of a utility machine, which improves the workability and handling of a component, which keeps costs low, and which can be properly applied to either of large and small machine bodies. <P>SOLUTION: This cab structure of the utility machine includes: a pair of first right and left beam members 45 and 44; a pair of right and left joint portions A in which a pair of right and left supports 48R and 48L passes through the first beam members 45 and 44 so as to be joined to a roof panel 42, respectively; a second beam member 51 which is laid between the joint portions A; a first planar gusset 52; and one set of two second planar gussets 53. In the first gusset 52, its one surface portion abuts on the inside surfaces of the supports 48R and 48L in parallel in a state in which its in-plane direction corresponds to a vertical direction and the lengthwise direction of a machine body. The one set of second gussets 53 vertically abuts on the other surface portion of the first gusset 52 and vertically abuts on the roof panel 42, in a state in which its in-plane direction corresponds to the vertical direction and the width direction of the machine body and in which the second beam member 51 is sandwiched between them. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a structure of a cab equipped with ROPS in a work machine such as a wheel loader.

  As shown in FIG. 11, the wheel loader 1 is divided into a front vehicle 10 and a rear vehicle 20, and the front vehicle 10 and the rear vehicle 20 are connected to each other through a connecting portion 30 so as to be swingable left and right. Configured. The front vehicle 10 includes a front frame 11, a front wheel 12, and a work device 13 that serve as a gantry, and the rear vehicle 20 includes a rear frame 21, a rear wheel 22, a cab 23, and an engine (not shown) serving as a gantry. It has.

For example, as disclosed in Patent Document 1, the cab 23 is provided with ROPS (Roll) that secures a safety protection space (so-called DLV: deflection limit region) for an operator wearing a seat belt in the event of an aircraft toppling. -Over Protective Structure) is known to have a fall protection structure.
This ROPS needs to have a strength capable of securing the safety protection space when a load assumed at the time of falling is applied. That is, for example, when a load is applied from the side at the time of falling, the pillar 23a and the roof panel 23b supported by the pillar 23a are deformed to absorb the falling energy. Thus, the pillar 23a and the roof panel 23b are Even if it is deformed, it is necessary that the deformed pillar 23a and the roof panel 23b have a structural strength that does not enter the safety protection space.

For this reason, the cab 23 equipped with ROPS uses, as an example, a steel plate having a thickness of 4 mm for the roof panel 23b, and a joint portion between the pillar 23a and the roof panel 23b with a large gusset (not shown). There is something to be reinforced.
JP 2001-123482 A

  However, the use of a steel plate having a thickness of 4 mm is expensive and has problems that its workability is not good. Moreover, since the gusset is large, there is a problem that the weight increases and handling is difficult. Furthermore, when the cab of a small wheel loader is equipped with ROPS, there is a problem that it is difficult to use a large gusset for securing a safe protection space for the operator.

  The present invention has been devised in view of such problems, and improves workability and handling of parts, suppresses costs, and is applicable to any machine body, large and small. An object is to provide a cab structure.

  In order to achieve the above object, a cab structure for a work machine according to a first aspect of the present invention includes a base frame that forms a floor wall, a roof panel that forms a ceiling wall, and a stand that stands on the base frame. A pair of left and right first beam members that extend along the left and right edges of the roof panel and extend in the longitudinal direction of the fuselage. The pair of left and right struts are bridged between the pair of left and right joints that pass through the first beam member on the left or right side and are joined to the roof panel, and the pair of left and right joints. A second beam member that extends in the width direction of the machine body and reinforces each joint portion; a first gusset that further reinforces each joint portion; and a pair of second gussets, and the first gusset includes: The plane shape In a state where the in-plane direction coincides with the vertical direction and the longitudinal direction of the body, the one surface portion abuts in parallel with the inner surface of the support column, and the pair of second gussets each have a planar shape, The in-plane direction coincides with the vertical direction and the machine width direction, and the second beam member is sandwiched between the two, and the second gusset is in contact with the other surface portion of the first gusset and is perpendicular to the roof panel. It is characterized by being in contact with.

  A cab structure for a work machine according to a second aspect of the present invention is the cab of the work machine, wherein the base frame that forms the floor wall, the roof panel that forms the ceiling wall, and the roof frame that stands on the base frame and supports the roof panel. A cab structure having a pair of left and right front pillars and a pair of left and right rear pillars, and a left beam and a right beam that extend along the left or right edge of the roof panel and extend in the longitudinal direction of the body, Each of the pair of rear pillars extends between the pair of left and right joints that pass through the left beam or the right beam and is joined to the roof panel, and the pair of left and right joints and extends in the width direction of the body. A cross member that reinforces each joint part, a first gusset that further reinforces each joint part, and a pair of two gussets, The gusset has a planar shape, and in a state where the in-plane direction coincides with the vertical direction and the longitudinal direction of the body, the one surface portion abuts in parallel with the inner side surface of the left rear pillar or the inner side surface of the right rear pillar, A pair of second gussets each having a planar shape, the in-plane direction of which coincides with the vertical direction and the body width direction, and the cross member is sandwiched between them. It is characterized in that it abuts perpendicularly to the other surface portion and abuts perpendicularly to the roof panel.

  In addition, if said working machine is a wheel loader, it is more preferable.

  According to the cab structure of the working machine of the present invention, each joint portion between the support column (or rear pillar) and the roof panel is composed of a second beam member (or cross member), one first gusset, and one set. Because it is reinforced centrally with the second gusset, even if a load is applied from the side when the aircraft falls, the deformation of the pillar (rear pillar) and roof panel is suppressed, and the deformed pillar (rear pillar) and roof panel are used by the operator. Can be prevented from entering the safeguarded space (DLV).

  And since the joints are reinforced centrally in this way, even if the roof panel is made of a steel plate that is thinner than the conventional one, it is possible to secure a safe space for the operator when it falls down and to reduce costs. At the same time, workability can be improved. Furthermore, the gusset that centrally reinforces the joint area is not reinforced with a single large gusset as in the past, but is reinforced with multiple gussets, so each gusset can be reduced in size and weight, and handling is also improved. be able to.

  In addition, since each gusset can be made relatively small, even if a small machine is provided with a lining that covers the gusset or the like inside the roof panel, a sufficient safety protection space for the operator can be secured. That is, it is possible to adopt the same reinforcing structure in both large and small machines, and versatility can be improved.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[One Embodiment]
An embodiment of the present invention will be described. 1 to 10 are views showing a cab structure of a working machine according to an embodiment of the present invention, in which FIG. 1 is an overall perspective view, FIG. 2 is a perspective view of a ceiling portion seen from below, FIG. 2 is a cross-sectional view taken along the line XX in FIG. 2, FIG. 4 is a cross-sectional view taken along the line Y-Y in FIG. 3, FIG. 5 is a cross-sectional view of the floor viewed from above, and FIG. 7 is a perspective view of the light beam, FIG. 8 is a front view of the large gusset, FIG. 9 is a front view of the small gusset, and FIG. 10 is a side view of the cab to which the cab structure is applied. Note that FIG. 11 used in the description of the prior art will be used as appropriate.

<Configuration>
The cab structure of the present invention is applied to the cab 40 shown in FIG. 10 in place of the cab 23 in the wheel loader (work machine) 1 shown in FIG. Since the configuration of the wheel loader 1 is the same as that of the prior art except for the cab, the description thereof is omitted.
The cab 40 is equipped with ROPS (protection structure at the time of falling), and the ROPS has a base frame 41, a roof panel 42, a front beam 43, a left, as shown in FIGS. A beam (first beam member) 44, a light beam (first beam member) 45, a rear beam 46, a pair of left and right front pillars (columns) 47L and 47R, a pair of left and right rear pillars (columns) 48L and 48R, The outline is composed from. The ROPS of the cab 40 has two cross members (second beam members) 51 and 51, two large gussets (first gussets) 52 and 52, and four small gussets (first gussets) as reinforcing members. 2 gussets) 53, 53, 53, 53.

  The base frame 41 is a steel plate that forms the floor wall of the cab 40, and has a substantially hexagonal shape in plan view. Specifically, the rectangle and the trapezoid have a hexagonal shape in which the base of the trapezoid is joined to the front side of the rectangle. An operator seat, a console box, a steering handle (all not shown) and the like are attached to the base frame 41.

The roof panel 42 is a steel plate having a substantially quadrangular shape in a plan view that forms the ceiling wall of the cab 40, and its edge is folded inward to improve the appearance. Then, in consideration of workability such as inward folding described above, it is formed of a steel plate having a thin plate thickness of 3.2 mm, for example.
The front beam 43, the left beam 44, the right beam 45, and the rear beam 46 are beam members made of steel plates and extend along the four sides (edges) of the roof panel 42.

Specifically, the front beam 43 is a flat plate, abuts against the front ends of the left beam 44 and the right beam 45, and extends in the left-right direction (machine width direction).
As shown in FIG. 6, the left beam 44 is a channel having a U-shaped cross section, and a part 44 a thereof is cut away. As shown in FIG. 2, the U-shaped opening portion faces upward and abuts against the roof panel 42 in a state of extending in the front-rear direction (front-rear direction of the machine body). The upper end portion of the rear pillar 48L is fitted.

  As with the left beam 44, the right beam 45 is a channel having a U-shaped cross section, and a part 45a thereof is notched as shown in FIG. Then, as shown in FIG. 2, the U-shaped opening portion faces upward and abuts against the roof panel 42 in a state of extending in the front-rear direction. Also, as shown in FIG. The upper end portion of the right rear pillar 48R is fitted to 45a.

  As shown in FIGS. 1 and 2, the rear beam 46 is a channel having a U-shaped cross-section, and the roof panel is in a state where the U-shaped open portion faces upward and extends in the left-right direction. 42 abuts. The rear beam 46 is located between the rear end portion of the left beam 44 and the rear end portion of the right beam 45 so as to connect the left beam 44 and the right beam 45.

Each of the pair of left and right front pillars 47L and 47R and the pair of left and right rear pillars 48L and 48R is a column made of a steel pipe having a square cross section, and is erected on the base frame 41 and supports the roof panel 42.
Specifically, the pair of left and right front pillars 47L and 47R are erected at the corners of the trapezoidal portion, which is the front portion of the base frame 41, as shown in FIG. The roof panel 42 is supported in contact with the bottom surfaces of the left beam 44 and the right beam 45.

  As shown in FIG. 5, the pair of left and right rear pillars 48L and 48R are erected on the rear portion of the base frame 41, and as shown in FIG. 2 and described above, the upper ends thereof are cut off of the left beam 44 and the right beam 45. The roof panel 42 is supported by being in contact with the roof panel 42 while being fitted into the notches 44a and 45a and passing through the left beam 44 and the right beam 45 (in other words, passing through). As shown in FIG. 5, the rear pillars 48L and 48R have a larger cross-sectional area than the front pillars 47L and 47R.

  Each of the two cross members 51 and 51 is a substantially C-shaped channel in cross-sectional shape, and as shown in FIGS. 1 and 2, the C-shaped open portion faces upward and the left-right direction In contact with the roof panel 42. Further, both end portions of each cross member 51 are in contact with the left beam 44 and the right beam 45, respectively. Here, the two cross members 51, 51, the front beam 43, and the rear beam 46 are arranged side by side so that their distances are substantially equal. A cross member 51 (hereinafter referred to as a rear cross member) 51 disposed on the rear side is a portion where notches 44a and 45a of the left beam 44 and the right beam 45 are formed, and is formed on the left beam 44 and the right beam 45. It comes to contact. That is, here, the portions where the notches 44a and 45a are formed are the joining portions A and A of the left beam 44 and the right beam 45 and the left and right rear pillars 48L and 48R, and the rear cross member 51 is connected to these joining portions A and A. It spans between A and reinforces each joining part A.

Further, the joint portion A is reinforced centrally by a large gusset 52 and a small gusset 53.
The concentrated reinforcement of the joint portion A will be described in detail with reference to FIGS. 3 and 4 in particular. 3 is a perspective view of the right joint portion A as viewed from the XX direction in FIG. 2, and FIG. 4 is a set of small gussets from the right joint portion A as viewed from the YY direction in FIG. FIG.

  First, the large gusset 52 will be described. The large gusset 52 is a planar steel material (flat steel), and as shown in FIG. 8, the outer shape of the large gusset 52 is a first straight portion 52 a that extends straight in the horizontal direction, A first curved portion 52b that makes a small acute angle with respect to the straight line portion 52a and draws a relatively large radius curve, and an angle that is 90 degrees or close to 90 degrees with respect to the first straight line portion 52a and is compared with the first curved portion 52b. The second curved portion 52c that draws a gentle curve is formed in a roughly triangular shape. In other words, when the first straight portion 52a is taken as the base, the large gusset 52 reaches the top where the first curved portion 52b, which has a gentle slope but gradually becomes steep, and the steep second curved portion 52c meet. It is formed in a mountain shape having a portion 52t.

  Next, the small gusset 53 will be described. The small gusset 53 is a planar steel material (flat steel) having an area smaller than that of the large gusset 52, and the outer shape thereof is in the horizontal direction as shown in FIG. A first straight portion 53a that extends straight; a second straight portion 53b that extends straight in the vertical direction; a first curved portion 53c that connects one end of the first straight portion 53a and one end of the second straight portion 53b with a gentle curve; A portion (the portion of the L-shaped curved portion 53d) is cut out from the L-shaped curved portion 53d that connects the other end of the portion 53a and the other end of the second straight portion 53b with a rounded substantially L-shaped curve. It is formed in a right triangle shape.

As shown in FIG. 1 to FIG. 3, such a large gusset 52 and two small gussets 53, 53 are used as a group and used in one joint site A. It has become.
First, as shown in FIG. 3 and FIG. 4, the large gusset 52 has its first straight portion 52a aligned with the light beam 45 (or while the in-plane direction (the direction in which the surface expands) coincides with the vertical direction and the front-rear direction. The left beam 44) abuts perpendicularly to the bottom surface, its outer surface (one surface) abuts in parallel with the inner surface of the right rear pillar 48R (or the left rear pillar 48L), and its top 52t is the right rear pillar 48R. (Or the rear pillar 48L on the left side) is disposed so as to be located in the center in the front-rear direction of the inner side surface.

  Next, the pair of small gussets 53 and 53 are arranged in a state where the cross member 51 is sandwiched between them as shown in FIG. The first straight portion 53a is disposed so as to abut on the roof panel 42 vertically. Further, as shown in FIG. 4, each L-shaped curved portion 53 d is fitted into and abuts the right beam 45 (or the left beam 44), and each second linear portion 53 b is the large gusset 52. It arrange | positions so that it may contact | abut perpendicularly to an inner surface (other surface). The pair of small gussets 53, 53 are arranged in parallel to each other as shown in FIG.

Furthermore, the reinforcement of the joining site | part of other members is also demonstrated easily below.
As shown in FIG. 2, the joint portion between the left beam 44 and the rear beam 46 is reinforced by a gusset (third gusset) 61. Similarly, the joining portion of the light beam 45 and the rear beam 46 is also reinforced by a gusset (fourth gusset) 62 having the same shape and size as the gusset 61 as shown in FIG.

Further, the joint portion between the left beam 44 and the front beam 43 is reinforced by a gusset (fifth gusset) 63 smaller than the gusset 61 and the gusset 62, and the joint portion between the right beam 45 and the front beam 43 is also the gusset 63. Reinforced by a gusset (sixth gusset) 64 of the same shape and size.
Here, each of the gussets 61 to 64 is a planar steel material (flat steel), and straddles the corners formed by the beams 43 to 46 to be reinforced in a state where the in-plane direction is made to coincide with the horizontal direction. Are in contact.

Further, as shown in FIG. 1, the joint portion between the front beam 43 and the left front pillar 47L is reinforced by a gusset (seventh gusset) 65, and the joint portion between the front beam 43 and the right front pillar 47R is also It is reinforced by a gusset (eighth gusset) 66 having the same shape and size as the gusset 65.
Here, each of the gussets 65 and 66 is a planar steel material (flat steel), and the beam 43 and the pillars 47L and 47R to be reinforced are in a state in which the in-plane direction coincides with the vertical direction and the front-rear direction. It is straddling across the corner part made by.

A lining (not shown) is stretched on the inner side of the roof panel 42 in order to improve the aesthetics of the appearance by, for example, concealing the reinforcing portions by the gussets 52, 53, 61 to 66.
As shown in FIGS. 1 and 5, the joint portions B between the rear pillars 48 </ b> L and 48 </ b> R and the base frame 41 are also reinforced in a concentrated manner as the joint portions A between the rear pillars 48 </ b> L and 48 </ b> R and the roof panel 42. .

  That is, each joint part B is concentrated and reinforced from the three directions (the three directions of the rear side, the front side, and the inner side) by the three gussets 71 to 73. The gussets 71 to 73 are planar steel materials (flat steel), and the base frame 41 and the rear pillar straddle the base frame 41 and the rear pillars 48L and 48R in a state where the in-plane direction thereof coincides with the vertical direction. 48L and 48R are in contact.

  On the other hand, each joint portion C between the front pillars 47 </ b> L and 47 </ b> R and the base frame 41 is reinforced by one gusset 74. The gusset 74 is also a planar steel material (flat steel), and the base frame 41 and the front pillar straddle the base frame 41 and the front pillars 47L and 47R in a state in which the in-plane direction thereof coincides with the vertical direction. 47L and 47R.

<Action and effect>
Since the cab structure of the working machine according to the embodiment of the present invention is configured as described above, the following operations and effects are obtained.
Each joint part A between the rear pillars 48L and 48R and the roof panel 42 is reinforced with a large gusset 52 and a pair of small gussets 53 so that if the aircraft falls down, Even if a load is applied, the deformation of the rear pillars 48L, 48R and the roof panel 42 can be suppressed, and the deformed rear pillars 48L, 48R and the roof panel 42 can be prevented from entering the operator's safety protection space (DLV). And since joint part A was concentrated and reinforced in this way, even if it uses a steel plate thinner than the conventional thickness of 3.2 mm for the roof panel 42, it is possible to sufficiently secure the operator's safety protection space when it falls. In addition, the cost can be reduced and the workability can be improved. Further, the gussets 52 and 53 for centrally reinforcing the joint portion A are not reinforced by a single large gusset as in the prior art, but are reinforced by a plurality of gussets 52 and 53. Can be reduced in size and weight, and handling can be improved.

Further, since each gusset 52, 53 can be made relatively small, even if a lining is stretched on the inner side of the roof panel 42 in a small machine, a sufficient safety protection space for the operator can be secured. That is, it is possible to adopt the same reinforcing structure in both large and small machines, and versatility can be improved.
Further, since the joint portion B below the rear pillars 48L and 48R is also reinforced in a concentrated manner, the deformation of the base frame 41 can be prevented satisfactorily.

[Others]
As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment, A various deformation | transformation is possible in the range which does not deviate from the meaning of this invention.
For example, in the above-described embodiment, the cab structure that concentrates and reinforces the joint portion A between the rear pillars 48L and 48R and the roof panel 42 has been described. However, the portion that concentrates and strengthens is not limited to the rear side, but the front pillars 47L and 47R and the roof panel. The joint portion with 42 may be reinforced centrally.

  Moreover, although the cab structure applied to the wheel loader 1 has been described in the above embodiment, it may be applied to other work machines such as a hydraulic excavator and a crane.

1 is an overall perspective view of a cab structure for a work machine according to an embodiment of the present invention. It is the perspective view which looked at the ceiling part of the cab structure of the working machine which concerns on one Embodiment of this invention from the bottom. It is a perspective view of the principal part of the cab structure of the working machine which concerns on one Embodiment of this invention, Comprising: It is the XX arrow line view of FIG. It is sectional drawing of the principal part of the cab structure of the working machine which concerns on one Embodiment of this invention, Comprising: It is the YY arrow line view of FIG. It is sectional drawing which looked at the floor part of the cab structure of the working machine which concerns on one Embodiment of this invention from the top. It is a perspective view of the left beam of the cab structure of the working machine which concerns on one Embodiment of this invention. It is a perspective view of the light beam of the cab structure of the working machine which concerns on one Embodiment of this invention. It is a front view of the large gusset of the cab structure of the working machine which concerns on one Embodiment of this invention. It is a front view of the small gusset of the cab structure of the working machine which concerns on one Embodiment of this invention. 1 is a side view of a cab to which a cab structure for a work machine according to an embodiment of the present invention is applied. It is a perspective view of a general wheel loader.

Explanation of symbols

1 Wheel loader (work machine)
DESCRIPTION OF SYMBOLS 10 Front vehicle 20 Rear vehicle 23 Cab 30 Connection part 40 Cab 41 Base frame 42 Roof panel 43 Front beam 44 Left beam (1st beam member)
45 Light beam (first beam member)
46 Rear beam 47L, 47R Front pillar (post)
48L, 48R Rear pillar (post)
51 Cross member (second beam member)
52 Large gusset (first gusset)
52a First straight part 52b First curved part 52c Second curved part 53t Top part 53 Small gusset (second gusset)
53a 1st straight line part 53b 2nd straight line part 53c 1st curve part 53d L-shaped curve part 61-66, 71-74 Gusset A Joint part

Claims (3)

In a cab of a work machine, a cab structure having a base frame that forms a floor wall, a roof panel that forms a ceiling wall, and a pair of left and right columns that are erected on the base frame and support the roof panel,
A pair of left and right first beam members extending along the left and right edges of the roof panel and extending in the longitudinal direction of the fuselage;
The pair of left and right struts respectively pass through the first beam member on the left or right side and join to the roof panel, and a pair of left and right joints;
A second beam member that spans between the pair of left and right joints and extends in the width direction of the machine body and reinforces each joint part;
A first gusset that further reinforces each joint site and a pair of two gussets;
The first gusset has a planar shape, and in a state in which the in-plane direction coincides with the vertical direction and the longitudinal direction of the body, the one surface portion abuts in parallel with the inner surface of the support column,
Each of the pair of second gussets has a planar shape, the in-plane direction thereof coincides with the vertical direction and the body width direction, and the second beam member is sandwiched between them. A cab structure for a work machine, wherein the cab structure is in contact with the other surface portion of the first gusset and is in contact with the roof panel vertically. In a cab of a work machine, a cab structure having a base frame forming a floor wall, a roof panel forming a ceiling wall, a pair of left and right front pillars standing on the base frame and supporting the roof panel, and a pair of left and right rear pillars Because
A left beam and a right beam along the left or right edge of the roof panel and extending in the longitudinal direction of the aircraft,
A pair of left and right rear pillars that pass through the left beam or the right beam and are joined to the roof panel;
A cross member that spans between the pair of left and right joints and extends in the width direction of the machine body and reinforces each joint part;
A first gusset that further reinforces each joint site and a pair of two gussets;
The first gusset has a planar shape, and in a state where the in-plane direction coincides with the vertical direction and the front-rear direction of the body, one surface portion of the first gusset contacts the inner side surface of the left rear pillar or the inner side surface of the right rear pillar. contact,
Each of the pair of second gussets has a planar shape, the in-plane direction thereof coincides with the vertical direction and the body width direction, and the first cross member is sandwiched between them. A cab structure for a work machine, wherein the cab structure is in contact with the other surface portion of the gusset vertically and in contact with the roof panel. The work machine cab structure according to claim 1 or 2, wherein the work machine is a wheel loader.

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