JP2009234439A - Cab of construction machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cab of a construction machine capable of assuring its adequate strength with a simple configuration and without using a member such as a reinforcement rib or the like. <P>SOLUTION: The cab 10 includes right-and-left front pillar members (a pillar section, a beam section) 31, 32, right-and-left rear pillar members 33, 34, a left intermediate pillar member 35, and an intermediate member 36 for joining the right-and-left rear pillar members 33, 34. The intermediate member 36 has tube expansion parts 36b at both ends. The intermediate member 36 is welded to the right-and-left rear pillar members 33, 34 at the tube expansion parts 36b. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a cab mounted on a construction machine such as a hydraulic excavator.

As a pillar member of a cab mounted on a construction machine, a cab structure constituted by using a hollow pipe material is adopted.
In a cab structure mounted on such a construction machine, the pipe used as a column member is required to have a strength of a predetermined value or more. However, increasing the wall thickness of the pipe to improve the strength increases the material cost, the processing cost, etc., and causes an increase in cost. Therefore, there is a need for a pipe reinforcement structure that can solve both the strength and cost problems.

For example, Patent Document 1 discloses a cab configuration in which a double structure of an inner panel and an outer panel is provided, and a horizontal beam connecting pillars is provided between the panels.
JP 2006-321372 A (published November 30, 2006) JP 2007-69877 A (published March 22, 2007)

However, the conventional construction machine cab has the following problems.
That is, in the cab of the construction machine disclosed in the above publication, reinforcing ribs are provided at the corners of the portion where the crosspiece and the pillar are joined. That is, in order to sufficiently secure the cab, it is necessary to use reinforcing ribs and the like, which may complicate the cab configuration.

  The subject of this invention is providing the cab of the construction machine which can ensure sufficient intensity | strength by simple structure, without using members, such as a reinforcement rib.

A cab for a construction machine according to a first invention includes a plurality of column members, a plurality of beam members, and an intermediate member. The plurality of beam members are joined to the plurality of column members. The intermediate member has tube expansion portions at both ends, and the tube expansion portions that connect between the column members or between the beam members are respectively joined.
Here, for example, tube expansion portions are formed at both ends of the intermediate member that joins between the column members on the back side of the cab, and the tube expansion portions are respectively joined to the column members.

Here, the pipe expansion part is a part where the cross-sectional area formed using, for example, roll forming or a punch inserted into a pipe end part of a steel pipe is enlarged. Construction machines include hydraulic excavators, bulldozers, wheel loaders, and the like. Further, a pipe material having a hollow inside can be used for the intermediate member.
As a result, by adopting a structure in which the intermediate member is joined at the expanded portion to the column member, etc., the cross-sectional area has been increased to the same strength as a reinforcing structure in which a normal pipe material and a reinforcing rib are combined. It can be secured at the expanded portion. For this reason, compared with the structure which joins the intermediate member without a pipe expansion part, a pillar member, etc., the intensity | strength of the junction part of an intermediate member, a pillar member, etc. can be improved. In addition, the strength of the joint can be improved without adding another member such as a reinforcing rib, so that the number of parts can be reduced and the structure of the cab for ensuring the required strength can be simplified. it can.

The cab of the construction machine according to the second invention is the cab of the construction machine according to the first invention, and the intermediate member constitutes a part of the window frame disposed between the pillar members constituting the cab. To do.
Here, the intermediate member is arranged as a part of the window frame installed in the cab.
Thereby, by using the said intermediate member as a part of window frame, the structure of a window frame periphery can be simplified and the intensity | strength of a cab can be ensured in a window frame periphery.

A cab for a construction machine according to a third invention is a cab for a construction machine according to the second invention, and the intermediate member constitutes a part of a window frame disposed on the back surface of the cab.
Here, the intermediate member is arranged as a part of the window frame installed on the back side of the cab.
Thereby, by using the said intermediate member as a part of window frame, the structure of the cab back side can be simplified and the intensity | strength of a cab can be ensured from the back side of a cab.

A cab for a construction machine according to a fourth aspect is the cab for a construction machine according to any one of the first to third aspects, wherein the intermediate member is expanded to one side in a direction intersecting the longitudinal direction. The expanded pipe portion is provided.
Here, a member having an expanded portion whose cross-sectional area is expanded on one side in the direction intersecting the longitudinal direction is used as the intermediate member having both ends expanded.
Thereby, for example, when used as a part of a window frame body, since the shape swells only on one side, a cab reinforcing structure can be configured while avoiding interference with other members. .

A cab for a construction machine according to a fifth aspect is the cab for a construction machine according to any one of the first to third aspects, wherein the intermediate member is expanded on both sides in a direction intersecting the longitudinal direction. The expanded pipe portion is provided.
Here, as an intermediate member having both ends expanded and formed, a member having an expanded portion that protrudes on both sides in a direction intersecting the longitudinal direction and has an enlarged cross-sectional area is used.
Thereby, the reinforcement structure of a cab can be effectively comprised with a simple structure by expanding the both ends of the intermediate member joined with respect to a pillar member etc. and increasing a cross-sectional area.

A cab for a construction machine according to a sixth invention is the cab for a construction machine according to any one of the first to fifth inventions, wherein the intermediate member is against the column member or the beam member at the end face of the expanded portion. Are joined in contact with each other.
Here, at the joint portion between the intermediate member and the column member or the like, the tube expansion portion is joined by welding or the like in a state where the end surface of the expanded portion is in contact with the column member or the like.
Thereby, the joining area of an intermediate member and a pillar member can be increased, and the intensity | strength of a cab can be reinforced in a junction part.

A cab for a construction machine according to a seventh invention is a cab for a construction machine according to any one of the first to sixth inventions, wherein the expanded pipe portion is inserted into the column member or the beam member. Are joined together.
Here, the pipe expansion part formed in the edge part of the intermediate member is joined in the state inserted with respect to the pillar member etc. which are joining destinations.

Here, the state in which the tube expansion portion is inserted into the column member or the like means a state in which an opening is formed in a part of the joint portion of the column member and at least a part of the tube expansion portion is inserted into the opening.
Thereby, by using the intermediate member which has a pipe expansion part in both ends, not only reinforcement of a junction part but the bending rigidity of the joined column member can be increased. As a result, the strength around the expanded pipe portion can be further improved, and the rigidity of the entire cab can be greatly improved.

A cab for a construction machine according to an eighth aspect is the cab for a construction machine according to the seventh aspect, wherein the expanded portion is inserted only in a longitudinal direction of the column member or the beam member at a part of the surface constituting the cross section. Is done.
Here, a part of surfaces (for example, one surface or two surfaces) constituting the cross section of the expanded portion is inserted in the longitudinal direction of the column member or the like.

  As a result, a part of the expanded pipe part inserted into the pillar member or the like functions as a reinforcing material inside the pillar member or the like, and the bending rigidity of the pillar member or the like into which a part of the expanded pipe part is inserted is effectively improved. Can do.

  According to the cab of the construction machine according to the present invention, the strength of the joint portion can be improved without adding another member such as a reinforcing rib, so that the number of parts is reduced and the necessary strength is ensured. The structure of the cab can be simplified.

A cab 10 of a hydraulic excavator (construction machine) 1 according to an embodiment of the present invention will be described below with reference to FIGS.
[Configuration of hydraulic excavator 1]
As shown in FIG. 1, the hydraulic excavator 1 according to the present embodiment includes a lower traveling body 2, a turning frame 3, a work implement 4, a counterweight 5, an engine 6, and a cab 10. .

The lower traveling body 2 has the crawler belt P wound around the left and right end portions in the traveling direction to rotate the hydraulic excavator 1 forward and backward, and the revolving frame 3 is mounted on the upper surface side in a state in which the revolving frame 3 can be swiveled.
The turning frame 3 can turn in any direction on the lower traveling body 2, and has a work machine 4, a counterweight 5, an engine 6, and a cab 10 mounted on the upper surface.

The work implement 4 is configured to include a boom, an arm attached to the tip of the boom, and a bucket attached to the tip of the arm. While moving the arm, bucket, and the like up and down by a hydraulic cylinder, Work at the site of civil engineering work where excavation of earth and sand and gravel.
The counterweight 5 is made of, for example, scrap iron or concrete in a box formed by assembling steel plates and is hardened. ing.

The engine 6 is a drive source for driving the lower traveling body 2 and the work implement 4, and is disposed at a position adjacent to the counterweight 5.
The cab 10 is a driver's cab where an operator of the excavator 1 gets on and off, and is disposed on the left front side to the side of the mounting portion of the work implement 4 on the revolving frame 3 so that the tip of the work implement 4 can be seen. (See FIG. 2). The cab structure of the cab 10 will be described in detail later.

[Structure of cab 10]
As shown in FIG. 2, the cab 10 of the present embodiment is configured to include five column members 31 to 35, an intermediate member 36, a back window portion W, and the like.
The column members 31 to 35 are configured to include a left front column member 31, a right front column member 32, a left rear column member 33, a right rear column member 34, and a left middle column member 35.

  The left front column member 31 and the right front column member 32 are used as columns called so-called A pillars, and have a deformed cross section having a hollow inside. The left and right front column members 31 and 32 are bent in the vicinity of the center portion and include a column portion standing from the floor surface in front of the cab 10 and a beam portion constituting the ceiling surface. The irregular cross section means, for example, a cross section having a substantially square shape or a complicated shape excluding a circular pipe.

The left rear column member 33 and the right rear column member 34 are used as columns called so-called C pillars, and have a substantially rectangular irregular cross section with a hollow inside. The left and right rear column members 33 and 34 are erected from the floor behind the cab 10 as substantially linear columns. The left and right rear column members 33 and 34 are joined to each other by an intermediate member 36 in the vicinity of the central portion thereof.
Further, the left and right rear column members 33 and 34 are joined in a state in which a tube expansion portion 36b of an intermediate member 36 described later is in contact (see FIGS. 3 and 4) and formed on the side surface as shown in FIG. The openings 34a and 34b are reinforced by the reinforcing plates 41a and 41b inserted into the hollow interior.

The left middle column member 35 is used as a column called a so-called B pillar, and is erected between the beam portion of the left front column member 31 and the floor surface.
The intermediate member 36 is provided as a horizontal rail constituting the window frame of the rear window W, and joins between the left and right rear column members 33 and 34. The configuration of the intermediate member 36 will be described in detail later.

(Intermediate member 36)
In the present embodiment, as a part of the window frame of the back window portion W of the cab 10, an intermediate member 36 obtained by processing a pipe material so that the cross section of both end portions is increased is used. As shown in FIGS. 3 to 5, the intermediate member 36 includes a main body portion 36 a and a tube expansion portion 36 b.

The main body portion 36a is a pipe material having a substantially rectangular cross section, and is formed so as to be continuous with the pipe expanding portion 36b at both ends as shown in FIG.
The pipe expansion part 36b is a part that is pipe-expanded by punching or roll forming inserted into the hollow part from the end of the pipe material, and has a larger cross section than the main body part 36a. Further, as shown in FIGS. 3 and 4, the pipe expansion portion 36 b is welded and joined in a state where it abuts against the left and right rear column members 33 and 34. 3 and 4 show a portion where the expanded portion 36b is in contact with the right rear column member 34, but the other end (on the left rear column member 33 side) also has the same form. It shall be joined. Furthermore, as shown in FIGS. 3 to 5 and the like, the pipe expansion portion 36b is pipe-expanded only in one direction in the direction intersecting the longitudinal direction of the intermediate member 36. The pipe expansion part 36b has pipe expansion part planes 36ba and 36bb facing each other, and is abutted and joined to the side surfaces of the left and right rear column members 33 and 34.

[Features of this cab 10]
(1)
As shown in FIG. 2 and the like, the cab 10 of the present embodiment includes left and right front column members (column portions and beam portions) 31 and 32, left and right rear column members 33 and 34, a left middle column member 35, and left and right rear columns. And an intermediate member 36 for joining the column members 33 and 34 to each other. As shown in FIGS. 3 to 5, the intermediate member 36 has expanded pipe portions 36 b at both ends, and is welded to the left and right rear column members 33 and 34 at the expanded pipe portion 36 b.

  Thereby, since the intermediate member 36 is welded to the side surfaces of the left and right rear column members 33 and 34 in the expanded pipe portion 36b having an enlarged cross-sectional area, the joint strength at the joint portion can be improved as compared with the conventional case. . That is, the portion that has been expanded and formed by forming the expanded portion 36b can be used as a conventional reinforcing rib. Therefore, the reinforcing rib is not required, and sufficient strength can be ensured with a simple configuration.

(2)
In the cab 10 of the present embodiment, as shown in FIG. 2, an intermediate member 36 is used as a part of the window frame of the rear window portion W attached to the cab 10.
Thereby, the intensity | strength around a complicated window part can be improved rather than before by simple structure.

(3)
In the cab 10 of this embodiment, the intermediate member 36 is used as a part of the window frame of the back window part W installed in the back side of the cab 10, as shown in FIG.
Thereby, the intensity | strength of the back side of the cab 10 can be improved with a simple structure. As a result, the rigidity of the cab 10 can be sufficiently ensured on the rear side, so that the cross-sectional area of the left and right front pillar members 31 and 32 on the front side of the cab 10 is reduced, and the view from the operator in the cab 10 is sufficient. Can be secured.

(4)
In the cab 10 of the present embodiment, as shown in FIGS. 3 to 5, an intermediate member 36 having a pipe expanding portion 36 b on one side is used.
Thereby, for example, even when the intermediate member 36 is used as a part of the window frame, the strength of the cab 10 can be improved without interfering with other components around the window frame.

(5)
In the cab 10 of the present embodiment, as shown in FIGS. 3 and 4, the intermediate member 36 and the left and right rear column members 33 and 34 are joined in a state in which the expanded portion 36 b is in contact.
Thereby, since the contact part of the intermediate member 36 with respect to the left and right rear pillar members 33 and 34 is enlarged by molding of the expanded pipe portion 36b, the joining area can be enlarged and the joining strength can be improved.

[Other Embodiments]
As mentioned above, although one Embodiment of this invention was described, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the summary of invention.
(A)
In the above-described embodiment, the example in which the intermediate member 36 is brought into contact with the side surface of the right rear column member 34 and welded is described. However, the present invention is not limited to this.

  For example, as shown in FIG. 6, one of the expanded portion planes 136ba and 136bb (expanded portion plane 136ba) constituting the expanded portion 136b formed at both ends of the body portion 136a of the intermediate member 136 is connected to the right rear column member 34. The structure inserted in the opening part 34b formed in the side surface may be sufficient. That is, the expanded portion plane 136ba of the expanded portion 136b can be used in place of the reinforcing plate 41b (see FIG. 4) of the above embodiment. As a result, the strength at the joint portion between the intermediate member 136 and the right rear column member 34 can be improved, and the bending rigidity of the right rear column member 34 itself can be improved using a part of the flat surface of the pipe expansion portion 136b.

  Further, as shown in FIG. 7, both the expanded portion flat surfaces 236 ba and 236 bb constituting the expanded portion 236 b of the intermediate member 236 are inserted into the openings 234 a and 234 b formed on the side surface of the right rear column member 234. There may be. That is, the expanded portion flat surfaces 236ba and 236bb of the expanded portion 236b can be used in place of the reinforcing plates 41a and 41b (see FIG. 4) of the above embodiment. As a result, the strength at the joint portion between the intermediate member 236 and the right rear column member 234 can be improved, and the bending rigidity of the right rear column member 234 itself can be improved using a part of the flat surface of the tube expansion portion 236b.

(B)
In the said embodiment, the example using the member expanded so that it might spread on one side was given and demonstrated as the intermediate member 36 which has the pipe expansion part 36b in both ends. However, the present invention is not limited to this.
For example, as shown in FIG. 8, an intermediate member 336 having tube expansion portions 336b expanded on both sides of the main body portion 336a so as to spread in both the left and right directions intersecting the longitudinal direction can be used.

In this case, since the cross-sectional area of the end portion of the intermediate member is further enlarged, the strength of the cab can be further effectively increased.
In other words, as to whether only one side or both sides of the expanded portion should be selected, one of them should be selected so as not to interfere with other members in consideration of the structure around the part where the intermediate member is installed. Good.

(C)
In the embodiment described above, an example in which the intermediate member 36 is used as the horizontal rail that connects the left and right rear pillar members 33 and 34 that form the back surface of the cab 10 has been described. However, the present invention is not limited to this.
For example, an intermediate member may be used as a horizontal rail provided as a window frame installed between the left middle pillar member as the B pillar and the left rear pillar member.

  According to such a configuration, it is possible to obtain the same effect as described above that the strength of the cab can be increased while the reinforcing ribs are reduced by the expanded pipe portions formed at both ends of the intermediate member.

(D)
In the embodiment described above, an example in which the intermediate member 36 is used as a part of the window frame of the back window portion W provided on the back surface of the cab 10 has been described. However, the present invention is not limited to this.
For example, an intermediate member having tube expansion portions at both ends can be used for parts other than the members constituting a part of the window frame.
Even in this case, the strength of the cab can be sufficiently ensured even if the number of members such as reinforcing ribs is reduced in a portion other than the region around the window frame.

(E)
In the said embodiment, the example which applied this invention with respect to the cab 10 mounted in the hydraulic shovel 1 was given and demonstrated. However, the present invention is not limited to this.
For example, the present invention may be applied to a cab mounted on another construction machine such as a wheel loader, a bulldozer, or a motor grader.

  Since the cab of the construction machine of the present invention can improve the strength of the joint portion without adding another member such as a reinforcing rib, the cab of the cab for reducing the number of parts and ensuring the required strength. Since the structure can be simplified, it can be widely applied to cabs mounted on various construction machines.

The figure which shows the cab of the construction machine which concerns on one Embodiment of this invention. The rear view which shows the cab on the turning frame of the construction machine of FIG. The enlarged view which shows the structure of the back side of the cab of FIG. FIG. 4 is a cross-sectional view taken along line AA in FIG. 3. The front view which shows the structure of the intermediate member provided in the back side of the cab of FIG. The perspective sectional view showing the structure of the periphery of the intermediate member used on the back side of the cab according to another embodiment of the present invention. The perspective sectional view showing the structure of the periphery of the intermediate member used on the back side of the cab according to still another embodiment of the present invention. The front view which shows the structure of the intermediate member which concerns on other embodiment of this invention.

Explanation of symbols

1 Hydraulic excavator (Construction machinery)
DESCRIPTION OF SYMBOLS 2 Lower traveling body 3 Turning frame 4 Working machine 5 Counterweight 6 Engine 10 Cab 31 Left front pillar member 32 Right front pillar member 33 Left rear pillar member 34 Right rear pillar member 34a, 34b Opening part 35 Left middle pillar member 36 Intermediate member 36a Main body Portion 36b Expanding portion 36ba, 36bb Expanding portion plane 41a, 41b Reinforcing plate 136 Intermediate member 136a Body portion 136b Expanding portion 136ba, 136bb Expanding plane portion 234 Right rear column member 234a, 234b Opening portion 236 Intermediate member 236a Expanding portion 236b Expanding portion 236b , 236bb Tube expansion plane portion 336 Intermediate member 336a Main body portion 336b Tube expansion portion P Track W Back window portion

Claims (8)

A plurality of pillar members;
A plurality of beam members joined to the plurality of column members;
An intermediate member that has pipe expanding portions at both ends, and the pipe expanding portions that connect between the column members or between the beam members,
Construction machine cab equipped with. The intermediate member constitutes a part of a window frame disposed between the pillar members constituting the cab,
The construction machine cab according to claim 1. The intermediate member constitutes a part of a window frame disposed on the back surface of the cab.
The construction machine cab according to claim 2. The intermediate member has the expanded portion expanded to one side in a direction intersecting the longitudinal direction.
The cab for a construction machine according to any one of claims 1 to 3. The intermediate member has the expanded portion that is expanded on both sides in a direction intersecting the longitudinal direction.
The cab for a construction machine according to any one of claims 1 to 3. The intermediate member is joined in contact with the column member or the beam member at the end face of the expanded portion.
The cab of a construction machine according to any one of claims 1 to 5. The expanded pipe part is joined in a state of being inserted with respect to the column member or the beam member.
The cab of a construction machine according to any one of claims 1 to 6. As for the said pipe expansion part, only the one part surface which comprises a cross section is inserted with respect to the said column member or the said beam member,
The construction machine cab according to claim 7.

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