JP2009137393A - Superstructure and construction machine equipped with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a superstructure capable of effectively suppressing the inclination of a cab when being subjected to the load from the side, and a construction machine equipped with the same. <P>SOLUTION: A cab 4 comprises a pair of side stays 16, 17, a pair of rear stays 18, 19, and beam members 21, 24 for connecting these stays 16-19. A reinforcing member 5 for reinforcing the cab 4 is provided on the right stay 16, and fixed to the cab 4 so as to keep the connection angle to at least one member out of the right stay 16 and the right beam member 21, and the transverse beam member 24. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an upper body of a construction machine.

  Conventionally, a construction machine includes a self-propelled lower traveling body and an upper body provided on the lower traveling body. The upper body includes a base frame provided on the lower traveling body, and a cab provided on the base frame and having an operator cab formed therein.

  The cab comprises a pair of left and right rear columns that are erected at the rear of the cab, a pair of left and right side columns that are erected at the sides of the cab, and a ceiling that is supported by the upper part of these columns. I have.

  In this type of construction machine, it is possible to maintain a large space in the cab even when a load is applied to the cab from the side, from the viewpoint of ensuring the safety of the operator during a fall. It is hoped that.

Therefore, in Patent Document 1, the cab is reinforced against the load by improving the strength of the cab ceiling.
JP 2007-55368 A

  However, in the technique of Patent Document 1, when the load is received, the space in the cab can be prevented from becoming narrow in the vicinity of the ceiling, and the tilt of the entire cab can be effectively suppressed. As a result of this tilting, the space in the cab could be reduced as a result of this tilting.

  In particular, in recent years, in order to improve the visibility of the operator, the cross-sectional area of the side column provided on the side of the cab is reduced or the side column itself is omitted, It is more difficult to suppress the tilt of the cab.

  This invention is made in view of the said subject, and provides a construction machine provided with the upper body which can suppress effectively the tilting of the cab at the time of receiving the load from a side, and this. It is aimed.

  In order to solve the above problems, the present invention is an upper body of a construction machine provided on a self-propelled lower traveling body, a base frame provided on the lower traveling body, and a base frame provided on the base frame. A cab having a cab inside and a reinforcing member for reinforcing the cab, and the cab is a pair of sides erected on the base frame at both left and right positions of the cab A pair of front and rear connecting each of the rear struts, a pair of rear struts erected on the base frame behind the side struts, and the rear struts and the side struts positioned in front of the rear struts. A beam member and a left and right beam member for connecting the side columns to each other in the left-right direction, and the reinforcing member is provided on at least one of the side columns, the one side column and the front and rear beam members ,left So as to hold the connecting angle and at least one member of the beam member to provide an upper body of a construction machine characterized in that it is fixed to the cab.

  According to the present invention, since the node between the side column and the front and rear beam members or the left and right beam members is solidified by the reinforcing member by the reinforcing member fixed to the cab, a load from the side is received on the cab. Even in the case, the lateral inclination of the side support column can be made small. In other words, when the cab receives a load from the side, the entire cab is tilted so that the front part of the cab rotates around the rear strut having a relatively strong strength. When attention is paid to the movement of the support column, the side support column is twisted in the same direction as the rotation direction. Here, in the present invention, since the connection angle between the side column and at least one of the front and rear beam members and the left and right beam members is maintained, the cab can be tilted by suppressing torsion of the side column. Can be suppressed.

  Therefore, according to the present invention, tilting of the cab when receiving a load from the side can be effectively suppressed.

  Specifically, the reinforcing member integrally includes a column fixing part fixed to the side column and a beam fixing part extending rearward from the column fixing part and fixed to the front and rear beam members. be able to. If it does in this way, it will become possible to hold | maintain the connection angle of a side part support | pillar and a front-back beam member.

  Further, the reinforcing member may include an extension portion extending forward from the support post fixing portion, and the extension portion may be connected to the base frame at a front portion of the cab.

  According to this configuration, by directly fixing the reinforcing member to the base frame, it is possible to increase the ability to hold the position of the reinforcing member with respect to the base frame. By maintaining the connection angle, the tilt of the cab can be more effectively suppressed.

  In the upper body, a pair of vertical plates erected on the base frame, and a base end portion is pivotally supported by the vertical plates inside the vertical plates so that the base frame can be raised and lowered. And the cab is provided at a lateral position that is the outside of the two vertical plates and at a position that sandwiches one vertical plate between the boom and the reinforcing member, A support post fixed to a side support located on the side close to the boom, and a contact part extending forward from the support post, the contact part having a maximum working radius. It is preferable that the cab is provided at a position where the cab can come into contact with the boom when receiving an external force directed from the side toward the boom in a state of being in the posture.

  According to this configuration, when an external force from the side toward the boom is generated with respect to the cab, first, the node between the side column and the front and rear beam members or the left and right beam members is solidified by the reinforcing member as described above. As a result, the lateral inclination of the side column is suppressed. When an external force is applied beyond the limit of cab tilt suppression by hardening the node, the cab starts tilting as a whole, but the contact portion of the reinforcing member forms the maximum working radius. By contacting the boom, tilting of the cab can be suppressed with the strength of the boom.

  Therefore, according to this configuration, in a stage where the external force is relatively small, the cab can be prevented from tilting by hardening the nodes of the side column and the front and rear beam members or the left and right beam members, and when the external force increases, Further, the tilt of the cab can be suppressed by taking advantage of the strength of the boom.

  Here, if the reinforcing member further includes a cross member that extends from the abutting portion toward the side away from the boom and is connected to a side column that is positioned far from the boom. In addition to improving the lateral strength of the cab itself against the external force, the external force can be transmitted to the contact portion, so that the external force can be finally supported by the boom. Therefore, in this way, it becomes possible to more effectively prevent the cab from being narrowed due to the generation of external force.

  Further, the present invention is an upper body of a construction machine provided on a self-propelled lower traveling body, a base frame provided on the lower traveling body, and a base frame provided on the base frame and provided therein. A cab having a driver's cab and a reinforcing member for reinforcing the cab, the cab including a pair of left and right rear struts erected on the base frame at a rear portion of the cab, and the rear struts. A pair of front and rear beam members extending forward, and side panels provided on the outer side surfaces of the rear column and the front and rear beam members, respectively, and the reinforcing member includes the front and rear beam members and the base frame. An upper body of a construction machine is provided, wherein the upper body is attached to a side surface which is an outer side of at least one of the side panels so as to be connected.

  According to the present invention, since the support cab side column is omitted, the visibility of the operator can be improved while ensuring the strength of the cab mainly by the rear column. Furthermore, in the present invention, since a reinforcing member for connecting the base frame and the front and rear beam members is provided outside the side panel, the reinforcing member is not only attached to the base frame but also to the rear column through the front and rear beam members. But it will be connected. Therefore, even when the cab receives an external force from the side, the strength of the base frame and the rear column can be borrowed through the reinforcing member to counter the external force. Therefore, according to the present invention, it is possible to suppress tilting of the cab.

  In the upper body, the reinforcing member is erected on the base frame at a position outside the side panel that is a side portion of the cab and is connected to the front and rear beam members, and the reinforcing column. It is preferable that an extension part extending forward is further provided, and the extension part is attached to the outer surface of the side panel and is connected to the base frame at the front part of the cab.

  According to this configuration, since the rear column is fixed to the base frame at two locations via the reinforcing column and the extending portion, the cab can be supported in a wider range against the external force from the side. The tilting of the cab can be suppressed.

  In the upper body, a pair of vertical plates erected on the base frame, and a base end portion is pivotally supported by the vertical plates inside the vertical plates so that the base frame can be raised and lowered. And the cab is provided at a lateral position that is the outside of the two vertical plates and at a position that sandwiches one vertical plate between the boom and the reinforcing member, A reinforcing column that is erected on the base frame on the side close to the boom among the side portions of the cab and is connected to the front and rear beam members, and a contact portion that extends forward from the reinforcing column. The contact portion is provided at a position where the boom can come into contact with the boom when the cab receives an external force directed from the side toward the boom in a state where the boom has a maximum working radius. Prefer to be There.

  According to this configuration, the reinforcing column that is erected on the side of the cab is also connected to the rear column via the base frame and the front and rear beam members, so the cab receives external force from the side First, the tilt of the cab can be suppressed against the external force by taking advantage of the strength of the base frame and the rear column. When a further external force is applied beyond the limit of tilt suppression by the reinforcing column, the cab starts to tilt, but the abutting portion extending forward from the reinforcing column has a boom with a maximum working radius. By abutting on the cab, tilting of the cab can be suppressed with the strength of the boom.

  Therefore, according to this configuration, the tilt of the cab can be suppressed by borrowing the strength of the base frame and the rear support column at a stage where the external force is relatively small, and when the external force becomes large, the cab can be borrowed by further borrowing the strength of the boom. Can be suppressed.

  Further, the reinforcing member includes a cross member that extends from the abutting portion toward a side away from the boom and is connected to a side column that is positioned on a side far from the boom. In addition to improving the lateral strength of the cab itself against the external force, the external force can be transmitted to the contact portion, so that the external force can be finally supported by the boom. Therefore, in this way, it becomes possible to more effectively prevent the cab from being narrowed due to the generation of external force.

  In addition, the present invention provides a construction machine including the upper body and a lower traveling body that supports the upper body.

  ADVANTAGE OF THE INVENTION According to this invention, the tilting of the cab at the time of receiving the load from a side can be suppressed effectively.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a plan view in which a part of a hydraulic excavator according to an embodiment of the present invention is omitted. FIG. 2 is a side view of the excavator of FIG. FIG. 3 is a front view of the excavator of FIG.

  1 to 3, a hydraulic excavator includes a self-propelled lower traveling body (not shown) and an upper revolving body (upper body) 1 that is turnably mounted on the lower traveling body. I have.

  The upper swing body 1 includes a base frame 2 that is turnably mounted on the lower traveling body, a boom 3 that is supported by the base frame 2 so as to be raised and lowered, and a cab that is erected on the base frame 2. 4 and a reinforcing member 5 (see FIG. 6) for reinforcing the cab 4. In the following description, description will be made using the front-rear and left-right directions from the viewpoint of the operator in the cab S1 formed in the cab 4.

  The base frame 2 is formed in a substantially rectangular shape in plan view extending in the front-rear direction. In the base frame 2, a pair of vertical plates 6 and 7 extending in the front-rear direction is erected at a substantially central position on the left and right sides of the base frame 2. These vertical plates 6 and 7 are respectively set to height dimensions H1 (see FIG. 3) set so as not to block the operator's field of view through the side window 4a (see FIG. 2) of the cab 4. Yes. A boom foot pin 8 is spanned between the vertical plates 6 and 7, and the boom 3 is supported by the boom foot pin 8.

  The boom 3 includes a boom body 3a that is pivotally supported by the boom foot pin 8 so as to be able to move up and down with respect to the base frame 2, and a contact member 3b fixed to the boom body 3a. The boom main body 3a is formed in a cylindrical shape having a rectangular cross section by welding the end portions of the top plate 9, the bottom plate 10, the right side plate 11, and the left side plate 12 to each other (see FIG. 3). The abutting member 3 b is a tubular member provided on the top plate 9. Specifically, the contact member 3b is formed in a U shape extending in the left direction from the boom main body 3a and bent rearward, and the bent end portion is bent toward the boom main body 3a. . The abutting member 3b is positioned so that at least a part thereof is positioned in the front-rear range E1 and the vertical range E2 in a state where the boom 3 (boom main body 3a) is in a raised posture with the maximum working radius shown in FIG. It is attached to the boom body 3b. These ranges E1 and E2 are set as ranges including the upper front edge of the cab 4.

  The cab 4 is erected on the left position of the left vertical plate 7 and at the front portion of the base frame 2. As shown in FIG. 5, the cab 4 includes a frame material 14 fixed to the base frame 2, and an exterior panel material 15 that is attached to the frame material 14 and constitutes the outer shape of the cab 4.

  FIG. 4 is a perspective view showing the entire configuration of the cab of FIG. 1 with a part thereof omitted. FIG. 5 is an exploded perspective view of the cab of FIG.

  4 and 5, the frame member 14 includes a right column (side column) 16, a left column (side column) 17, and a right rear column (rear column) erected on the base frame 2. 18 and a left rear column (rear column) 19. Of these columns 16 to 19, the column 16 and the column 17, the column 17 and the column 18 oppose each other in the left-right direction, and the column 16 and the column 18, the column 17 and the column 19 oppose each other in the front-rear direction. The right column 16 and the left column 17 (hereinafter may be abbreviated as side columns 16 and 17), the right rear column 18 and the left rear column 19 (hereinafter may be abbreviated as rear columns 18 and 19), and Are compared, the cross-sectional area of the rear struts 18 and 19 that hardly affect the field of view from the operator in the cab S1 is made larger than the cross-sectional area of the side struts 16 and 17 (see FIG. 9). The strength of the rear columns 18 and 19 is higher than the strength of the side columns 16 and 17.

  The frame member 14 includes a right beam member (front / rear beam member) 21 that connects upper ends of the right column 16 and the right rear column 18, and a left beam that connects upper ends of the left column 17 and the left rear column 19. A member (front and rear beam member) 22, a rear beam member (left and right beam member) 23 connecting the upper ends of the right rear column 18 and the left rear column 19, and the front ends of the right beam member 21 and the left beam member 22 And a horizontal beam member (right and left beam members) 24 for connecting the two beams, and a frame that is opened forward by the respective columns 16 to 19 and the beam members 21 to 23.

  Further, reinforcing auxiliary frames 20a to 20h are hung over appropriate positions of the support columns 16 to 19 and the beam members 21 to 24.

  The exterior panel material 15 includes a right outer panel 26 that covers the columns 16 and 18 from the outside (right side), and a left outside that covers the columns 17 and 19 from the outside (left side) facing the right outer panel 26 in the left and right directions. The panel 28 and the top panel 29 which comprises the ceiling of the cab 4 and is arrange | positioned at the upper part of each beam member 21-25 are provided. The top panel 29 includes three parts 29a to 29c. In the present embodiment, a range surrounded by the exterior panel material 15 is used as the cab S1.

  FIG. 6 is a perspective view showing a reinforcing member attached to the cab of FIG. FIG. 7 is a side view of the cab shown in FIG. 8 is a cross-sectional view taken along line VIII-VIII in FIG.

  5 to 8, the reinforcing member 5 is fixed to the outer side surface (right side surface) of the right outer panel 26 by bolts B1 to B4. Specifically, the reinforcing member 5 integrally includes a column fixing part 30 fixed to the right column 16 and a beam fixing part 31 extending rearward from the column fixing unit 30 and fixed to the right beam member 21. Have.

  As shown in detail in FIG. 8, the column fixing part 30 includes a cylindrical fixing part main body 30a extending in the vertical direction, and three bosses 30b (one shown in FIG. 8) welded to the fixing part main body 30a. It has.

  The fixed portion main body 30a is made of metal. The fixed portion main body 30a is provided at a position above the base frame 2 by a preset height dimension H2. Thereby, it is suppressed that an operator's visual field becomes narrow. The height dimension H2 is set to a dimension that is slightly higher than the height dimension H1 of the vertical plates 6 and 7 described above.

  Each boss 30b penetrates the fixing portion main body 30a in the left-right direction corresponding to the insertion position of the bolts B1 to B3. Bolts B <b> 1 to B <b> 3 pass through the right outer panel 26 through the bosses 30 b and are screwed to the right column 16, respectively.

  The beam fixing portion 31 is a metal plate whose front end surface is butt welded to the rear surface of the upper end portion of the column fixing portion 30. A hole 31a penetrating in the left-right direction is provided at the front end (rear end) of the beam fixing portion 31, and a bolt B4 is inserted through the hole 31a. The bolt B4 passes through the right outer panel 26 through the hole 31a and is screwed into the right beam member 21.

  That is, the reinforcing member 5 in this embodiment is fixed to the cab 4 so as to maintain the connection angle between the right column 16 and the right beam member 21. The reinforcing member 5 acts to suppress the cab 4 from tilting to the left side when an external force Y1 from the right side is applied to the cab 4.

  FIG. 9 is a schematic plan view for explaining the function of suppressing the tilting of the cab by the reinforcing member shown in FIG. 6, (a) is a stage before external force is applied, and (b) is after external force is applied. Each state is shown.

  As shown in FIG. 9 (a), in the stage before the external force Y1 is applied, the side columns 16, 17 and the rear columns 18, 19 are each in an upright posture. It has a substantially rectangular body in plan view.

  As shown in FIG. 9B, when the external force Y1 is applied, the cross-sectional area of the side columns 16 and 17 is smaller than that of the rear columns 18 and 19, so that the front upper portion of the cab 4 is the rear column. The cab 4 tends to be deformed so as to rotate to the right about 18 and 19. When attention is paid to the behavior of the right column 16 in the process of deformation, the right column 16 itself tries to rotate clockwise as indicated by an arrow Y2.

  Here, in this embodiment, as shown in FIGS. 6 to 8, a column fixing part 30 fixed to the right column 16 and a beam extending rearward from the column fixing unit 30 and fixed to the right beam member 21. Since the connection angle between the right column 16 and the right beam member 21 is maintained by the reinforcing member 5 having the fixing portion 31, the rotation (twist) of the right column 16 in the arrow Y2 direction is suppressed. Therefore, tilting of the cab 4 to the left side when the external force Y1 is applied can be suppressed.

  In the above embodiment, the reinforcing member 5 that holds the connection angle between the right column 16 and the right beam member 21 has been described. However, the reinforcing member holds the connection angle between the right column 16 and the cross beam member 24. There may be. Even when configured in this manner, the rotation (twisting) of the right column 16 when the external force Y1 is applied can be suppressed, so that the tilt of the cab 4 can be suppressed. That is, the connection angle needs to be maintained between the right column 16 and at least one of the right beam member 21 and the cross beam member 24.

  FIG. 10 is a perspective view of a cab according to another embodiment of the present invention. FIG. 11 is a side view of the cab shown in FIG. 12 is a cross-sectional view taken along line XII-XII in FIG.

  With reference to FIGS. 10 to 12, a reinforcing member 32 for reinforcing the cab 4 is fixed to the cab 4 of the present embodiment by bolts B <b> 5 to B <b> 10. The reinforcing member 32 includes a column fixing portion 33 fixed to the right column 16 and a cylindrical member 34 fixed to the upper end portion of the column fixing portion 33.

  The column fixing part 33 includes a cylindrical fixing part main body 33a extending in the vertical direction and two bosses 33b (one shown in FIG. 12) welded to the fixing part main body 33a. The fixing portion main body 33a is made of metal. Each boss 33b penetrates the fixing portion main body 33a in the left-right direction corresponding to the insertion position of the bolts B5, B6. The bolts B5 and B6 pass through the right outer panel 26 through the bosses 33b and are screwed into the right column 16, respectively.

  The cylindrical member 34 includes a cylindrical main body 35 whose longitudinal direction is directed in the front-rear direction, and four bosses 36 (one is shown in FIG. 12) welded to the cylindrical main body 35.

  The cylinder main body 35 has a cylindrical shape that extends in the front-rear direction by welding the end portions of the upper plate 35a, the lower plate 35b, the right plate 35c, and the left plate 35d to each other. The upper end surface of the fixing portion main body 33a is butt welded to the lower surface of the lower plate 35b.

  Each boss 36 is provided so as to straddle the right plate 35c and the left plate 35d corresponding to the insertion positions of the bolts B7 to B10. Bolts B <b> 7 to B <b> 9 pass through the right boss panel 26 through the bosses 36 and are respectively screwed into the right column 16. The bolt B10 is screwed to the right outer panel 26 through the corresponding boss 36.

  In the present embodiment, a portion of the tube main body 35 that is behind the fixed portion main body 33a functions as a beam fixing portion 27a (FIG. 11), while the tube main body 35 is located in front of the fixed portion main body 33a. The portion functions as the contact portion 27b (FIG. 11).

  The contact portion 27b is disposed in the front-rear range E1 and the vertical range E2 of FIG. 2, and contacts the contact member 3b when the cab 4 tilts to the left. Therefore, in the present embodiment, the following effects can be obtained when the external force Y1 is applied to the cab 4.

  When the external force Y1 is applied, rotation (twisting) of the right column 16 itself in the direction of the arrow Y2 is suppressed by the column fixing unit 33 and the beam fixing unit 27a as described above with reference to FIG. Thus, tilting of the cab 4 is suppressed.

  When an external force is applied beyond the ability of the cab 4 to be tilted and restrained by the column fixing part 33 and the beam fixing part 27a, the upper part of the cab 4 falls to the left side. In the present embodiment, since the contact portion 27b is provided at the upper front portion of the cab 4, the tilt of the cab 4 is suppressed by the contact between the contact portion 27b and the contact member 3b of the boom 3. It will be.

  In particular, in this embodiment, the configuration is such that the contact member 3b of the boom 3 and the contact portion 27b of the cab 4 that are in the posture of the maximum work radius, which is the most unstable work state, come into contact. It is possible to further improve safety in an unstable work state.

  FIG. 13 is a perspective view showing a reinforcing member according to still another embodiment.

  With reference to the figure, the cab 4 in this embodiment is provided with a reinforcing member 37. The reinforcing member 37 includes the column fixing portion 33 fixed to the right column 16 and a cylindrical member 38 fixed to the upper end portion of the column fixing portion 33. Only parts different from the embodiment shown in FIGS. 10 to 12 will be described below.

  The cylindrical member 38 extends further forward than the cylindrical member 34 of the above-described embodiment, and has a front-lowering posture so that its front end is connected to the base frame 2. That is, the cylindrical member 38 extends forward along the upper edge of the right outer panel 26.

  In this embodiment, by directly fixing the reinforcing member 37 to the base frame 2, the ability to hold the position of the reinforcing member 37 with respect to the base frame 2 can be enhanced. By maintaining the connection angle with the right beam member 21, the tilt of the cab 4 can be more effectively suppressed.

  Furthermore, in the embodiment of FIGS. 10 to 13, a cross member 39 as shown in FIG. 14 can be added. FIG. 14 is a perspective view showing a reinforcing member according to still another embodiment.

  With reference to FIG. 14, a reinforcing member 40 is provided in the cab 4 according to this embodiment. The reinforcing member 40 includes the column fixing portion 33, the cylindrical member 38, and a cross member 39 that connects the cylindrical member 38 and the left outer panel 28.

  According to this embodiment, not only can the strength in the left-right direction of the cab 4 itself against the external force Y1 be improved, but also the external force Y1 can be transmitted to the contact portion 27b (see FIG. 11). The external force Y1 can finally be supported by the boom 3.

  In the above embodiment, the frame material 14 including the side columns 16 and 17 has been described. However, in order to improve visibility from the operator, the frame material 41 in which the side columns are omitted may be used.

  FIG. 15 is a perspective view showing the frame material according to the embodiment in which the side column is omitted. 16 is a perspective view showing a cab having the frame material of FIG. 17 is a cross-sectional view taken along line XVII-XVII in FIG.

  With reference to these drawings, the cab 44 according to the present embodiment includes a frame material 41 and an exterior panel material 45 (see FIG. 16) attached to the outside of the frame material 41.

  The frame material 41 is obtained by omitting the side columns 16 and 17 from the frame material 14 of the above embodiment. Specifically, the frame member 41 includes a right rear strut 18 erected on the base frame 2, a left rear strut 19, and a right beam member (front and rear beam members) extending forward from the upper end of the right rear strut 18. 21, a left beam member (front and rear beam member) 22 extending forward from the upper end portion of the left rear column 19, a rear beam member 23 connecting the upper ends of the right rear column 18 and the left rear column 19, and a right beam member 21 and a horizontal beam member (left and right beam member) 24 for connecting the front end portions of the left beam member 22 to each other. Reinforcing auxiliary frames 20a to 20h are provided at appropriate positions of the support columns 18 and 19 and the beam members 21 to 24, respectively.

  The exterior panel member 45 is attached from the outside (right side) to the right rear column 18 and the right beam member 21 from the outside (right side) and from the outside (left side) to the left rear column 19 and the left beam member 22. The left outer panel 43 is provided.

  As shown in FIG. 16, the reinforcing member 46 according to the present embodiment is attached to the outer side surface (right side surface) of the right outer panel 42 by bolts B <b> 11 to 14. The reinforcing member 46 is integrally provided with a reinforcing column 47 erected on the base frame 2 and a beam fixing portion 48 extending rearward from the upper end of the reinforcing column 47, and the left beam member 22 and the base frame 2. Are to be connected.

  The reinforcing column 47 includes a cylindrical column main body 47a extending in the vertical direction, and three bosses 47b (one shown in FIG. 17) welded to the column main body 47a. The column body 47a is made of metal. Each boss 47b penetrates the column body 47a in the left-right direction corresponding to the insertion position of the bolts B11 to B13. The bolts B11 and B12 are fixed to the right outer panel 42 through the bosses 47b. The bolt B13 passes through the right outer panel 42 through each boss 47b and is screwed to the right beam member 21.

  The beam fixing portion 48 is a metal plate whose front end surface is butt welded to the rear surface of the upper end portion of the reinforcing support 47. A hole 48a penetrating in the left-right direction is provided at the front end portion (rear end portion) of the beam fixing portion 48, and the bolt B14 is inserted into the hole 48a. The bolt B14 passes through the right outer panel 42 through the hole 48a and is screwed to the right column 16.

  According to the present embodiment, since the reinforcing member 46 is configured to connect the base frame 2 and the right beam member 21, the reinforcing member 46 is not only connected to the base frame 2 but also to the right via the right beam member 21. Even when the cab 44 receives the external force Y1 from the side, the rear support 18 is also coupled to the external support Y1 with the strength of the base frame 2 and the right rear support 18. be able to.

  FIG. 18 is a perspective view of a cab according to another embodiment of the present invention. 19 is a cross-sectional view taken along line XIX-XIX in FIG.

  Referring to FIGS. 18 and 19, in the cab 44 of the present embodiment, a reinforcing member 50 for reinforcing the cab 44 is fixed by bolts B15 to B20. The reinforcing member 50 includes a reinforcing column 51 erected on the base frame 2 and a cylindrical member 52 fixed to the upper end portion of the reinforcing column 51.

  The reinforcing column 51 includes a cylindrical column main body 51a extending in the vertical direction, and two bosses 51b (one shown in FIG. 19) welded to the column main body 51a. The column body 51a is made of metal. Each boss 51b penetrates the column main body 51a in the left-right direction corresponding to the insertion position of the bolts B15, B16. Bolts B15 and B16 are screwed into the right outer panel 42 through the bosses 51b.

  The cylindrical member 52 includes a cylindrical main body 53 whose longitudinal direction is directed in the front-rear direction, and four bosses 54 (one is shown in FIG. 19) welded to the cylindrical main body 53.

  The cylinder body 53 has a cylindrical shape that extends in the front-rear direction by welding the ends of the upper plate 53a, the lower plate 53b, the right plate 53c, and the left plate 53d to each other. The upper end surface of the column main body 51a is butt welded to the lower surface of the lower plate 53b.

  Each boss 54 is provided so as to straddle the right plate 53c and the left plate 53d corresponding to the insertion positions of the bolts B17 to B20. Bolts B <b> 17 to B <b> 19 pass through each boss 54, penetrate the right outer panel 42, and are screwed into the right column 16. The bolt B20 is screwed to the right outer panel 42 through the corresponding boss 54.

  In the present embodiment, a portion of the cylinder main body 53 that is in front of the column main body 51a functions as a contact portion. That is, this contact portion is disposed in the front-rear range E1 and the vertical range E2 so as to be able to come into contact with the contact member 3b (see FIG. 2) of the boom 3 in a posture that forms the maximum working radius. ing. Therefore, when the external force Y1 is applied and the cab 44 tilts toward the boom 3, the abutting portion (front portion of the cylinder main body 53) and the abutting member 3b come into contact with each other, thereby tilting the cab 44. Can be suppressed.

  In particular, the present embodiment is configured so that the abutting member 3b of the boom 3 and the abutting portion of the cab 44 that are in the posture of the maximum working radius, which is the most unstable working state, are abutted. It is possible to further improve safety in a stable working state.

  FIG. 20 is a perspective view showing a reinforcing member according to still another embodiment.

  With reference to the same figure, the cab 44 in this embodiment is provided with a reinforcing member 55. The reinforcing member 55 includes the reinforcing column 51 and a cylindrical member 56 connected to the upper end of the reinforcing column 51. Only parts different from the embodiment shown in FIGS. 18 and 19 will be described below.

  The cylindrical member 56 extends further forward than the cylindrical member 52 of the above-described embodiment, and has a front-lowering posture so that a front end portion thereof is coupled to the base frame 2. That is, the cylindrical member 56 extends forward along the upper edge of the right outer panel 42.

  In this embodiment, since the rear column 18 is fixed to the base frame 2 at two locations via the reinforcing column 51 and the cylindrical member 56, the cab 44 is supported in a wider range with respect to the external force Y1 from the side. The tilt of the cab 44 can be suppressed.

  Furthermore, in the embodiment of FIGS. 18 to 20, a cross member 57 as shown in FIG. 21 may be added. FIG. 21 is a perspective view showing a reinforcing member according to still another embodiment.

  Referring to FIG. 21, a reinforcing member 58 is provided in the cab 44 according to this embodiment. The reinforcing member 58 includes the reinforcing column 51, the cylindrical member 56, and a cross member 57 that connects the cylindrical member 56 and the left outer panel 43.

  According to this embodiment, it is possible not only to improve the lateral strength of the cab 44 itself that opposes the external force Y1, but also to transmit the external force Y1 to the contact portion (a part of the cylindrical member 56). Therefore, the external force Y1 can be finally supported by the boom 3.

  In the embodiment shown in FIGS. 15 to 21, the right rear column 18 and the base frame 2 are connected via the reinforcing columns 47 and 51 and the right beam member 21, but as shown in FIG. The cylindrical member 56 can also be used as the reinforcing member 59.

  That is, in this embodiment, since the cylindrical member 56 is connected to the right beam member 21, the base frame 2 and the right rear column 18 can be connected via the cylindrical member 56 and the right beam member 21.

  Further, as shown in FIG. 23, the cross member 57 that connects the tubular member 56 and the left outer panel 43 can be used as the reinforcing member 59.

  In the above-described embodiments, the reinforcing member fixed to the right rear column 18 and the right column 16 has been described. However, the reinforcing member is not limited to the right side, and may be fixed to the left side.

It is a top view which omits and shows a part of hydraulic excavator which concerns on embodiment of this invention. It is a side view of the hydraulic excavator of FIG. It is a front view of the hydraulic excavator of FIG. It is a perspective view which abbreviate | omits one part and shows the whole structure of the cab of FIG. It is a disassembled perspective view of the cab of FIG. It is a perspective view which shows the reinforcement member attached to the cab of FIG. It is a side view of the cab shown in FIG. It is the VIII-VIII sectional view taken on the line of FIG. FIGS. 7A and 7B are schematic plan views for explaining the function of suppressing the tilting of the cab by the reinforcing member shown in FIG. 6, in which FIG. 6A is a stage before an external force is applied, and FIG. Show. It is a perspective view of the cab which concerns on another embodiment of this invention. It is a side view of the cab shown in FIG. It is the XII-XII sectional view taken on the line of FIG. It is a perspective view which shows the reinforcement member which concerns on another embodiment. It is a perspective view which shows the reinforcement member which concerns on another embodiment. It is a perspective view which shows the frame material which concerns on embodiment which abbreviate | omitted the side support | pillar. It is a perspective view which shows the cab which has a frame material of FIG. It is the XVII-XVII sectional view taken on the line of FIG. It is a perspective view of the cab which concerns on another embodiment of this invention. It is the XIX-XIX sectional view taken on the line of FIG. It is a perspective view which shows the reinforcement member which concerns on another embodiment. It is a perspective view which shows the reinforcement member which concerns on another embodiment. It is a perspective view which shows the reinforcement member which concerns on another embodiment. It is a perspective view which shows the reinforcement member which concerns on another embodiment.

Explanation of symbols

S1 cab 1 upper swing body 2 base frame 3 boom 3a boom body 3b contact member 4, 44 cab 5 reinforcing member 6, 7 vertical plate 14, 41 frame material 16 right column (side column)
17 Left column (side column)
18 Right rear support (rear support)
19 Left rear strut (rear strut)
21 Right beam member (front and rear beam members)
22 Left beam member (front and rear beam member)
24 Cross beam members (left and right beam members)
26, 42 Right outer panel (side panel)
27b Contact portion 28, 43 Left outer panel (side panel)
30, 33 Column fixing portion 27a, 31 Beam fixing portion 32, 37, 40, 46, 50, 55, 58, 59 Reinforcing member 39, 57 Cross member 47, 51 Reinforcing column

Claims (10)

An upper body of a construction machine provided on a self-propelled lower traveling body,
A base frame provided on the lower traveling body;
A cab provided on the base frame and having a cab inside;
A reinforcing member for reinforcing the cab,
The cab includes a pair of side columns that are erected on the base frame at both left and right positions of the cab, and a pair of rear columns that are respectively erected on the base frame behind the side columns. A pair of front and rear beam members that connect the rear column and the side column positioned in front of the rear column in the front-rear direction, and left and right beam members that connect the side columns to each other in the left-right direction,
The reinforcing member is provided on at least one of the side columns, and the cab is configured to maintain a connection angle between the one side column and at least one of the front and rear beam members and the left and right beam members. An upper body of a construction machine characterized by being fixed to   The reinforcing member integrally includes a support fixing portion fixed to the side support post and a beam fixing portion extending rearward from the support fixing portion and fixed to the front and rear beam members. The upper body of the construction machine according to 1.   The said reinforcement member is further equipped with the extension part extended ahead from the said support | pillar fixing | fixed part, This extension part is connected with the said base frame in the front part of the said driver's cab. Upper body of the construction machine described.   A pair of vertical plates erected on the base frame, and a boom that is supported in a undulating manner with respect to the base frame by a base end portion pivotally supported by the vertical plates inside the vertical plates. Further, the cab is provided at a side position that is the outside of the two vertical plates and at a position that sandwiches one vertical plate with the boom, and the reinforcing member is close to the boom. A column fixing part fixed to a side column that is positioned on the side, and a contact part extending forward from the column fixing part, the contact part being in a state where the boom has a maximum working radius The construction according to any one of claims 1 to 3, wherein the cab is provided at a position where it can come into contact with the boom when receiving an external force directed from the side toward the boom. The upper body of the machine.   The reinforcing member further includes a cross member that extends from the abutting portion toward a side away from the boom and is connected to a side column that is positioned on a side far from the boom. Item 5. The upper body of the construction machine according to Item 4. An upper body of a construction machine provided on a self-propelled lower traveling body,
A base frame provided on the lower traveling body;
A cab provided on the base frame and having a cab inside;
A reinforcing member for reinforcing the cab,
The cab includes a pair of left and right rear struts erected on the base frame at the rear of the cab, a pair of front and rear beam members extending forward from the rear struts, and the rear struts and the front and rear beam members. With side panels provided on the side surfaces that are outside,
The upper body of a construction machine, wherein the reinforcing member is attached to a side surface that is the outside of at least one of the side panels so as to connect the front and rear beam members and the base frame.   The reinforcing member is erected on the base frame at a position outside the side panel which is a side portion of the cab and is connected to the front and rear beam members, and extends forward from the reinforcing column. The extension part according to claim 6, further comprising an extension part, the extension part being attached to an outer surface of the side panel and connected to the base frame at a front part of the cab. Upper body of construction machinery.   A pair of vertical plates erected on the base frame, and a boom that is supported in a undulating manner with respect to the base frame by a base end portion pivotally supported by the vertical plates inside the vertical plates. The cab is further provided at a lateral position on the outside of the vertical plates and at a position where one vertical plate is sandwiched between the boom and the reinforcement member. A reinforcing column that is erected on the base frame on the side close to the boom among the side portions and that is connected to the front and rear beam members, and a contact portion that extends forward from the reinforcement column, the contact portion Is provided at a position where the cab can come into contact with the boom when receiving an external force directed from the side toward the boom in a state where the boom has a maximum working radius. Claim 7 The upper body of the construction machine.   The said reinforcing member is further provided with the cross member connected with the said side panel located in the side far from the said boom while extending to the side spaced apart from the said boom from the said contact part. Upper body of the construction machine described.   A construction machine comprising the upper body according to any one of claims 1 to 9, and a lower traveling body that supports the upper body.

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