JP5352980B2 - Upper body and construction machine provided with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an upper body capable of efficiently suppressing the tilting of a cab when the load from a lateral direction is applied, and also to provide a construction machine equipped with the same. <P>SOLUTION: The upper body is provided with a base frame 2 arranged on a lower traveling body, a pair of vertical boards 6, 7 erected on the base frame 2, a boom 3 having a base end pivoted on the vertical boards 6, 7 inside the vertical boards 6, 7 and capable of being raised and tilted relative to the base frame 2, the cab 4 erected on the base frame 2 to sandwich the vertical board 7 between the boom 3 and itself and a contact member 5 arranged on the boom 3 in such a way that the boom 3 takes an attitude with a maximum working radius and the contact member 5 comes into contact with the side face of the cab 4 earlier than the vertical plate 7 at a position above the upper end part of the vertical board 7 when the cab 4 receives external force from a lateral direction toward the boom 3. <P>COPYRIGHT: (C)2008,JPO&amp;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 is erected on the base frame on a side of the base frame provided on the lower traveling body, a boom attached to the base frame so as to be raised and lowered, and a side where the boom is attached. It has a cab.

  In this type of construction machine, the displacement (deformation) of the cab is reduced when a load is applied to the cab from the opposite side of the boom mounting position from the viewpoint of ensuring the safety of the operator during a fall. It is hoped to do.

  Therefore, in Patent Document 1, the support is reinforced by disposing a steel pipe inside the support of the hollow cab.

  In the case where the support is reinforced in this way, the rigidity of the cab itself can be secured, but the fixing of the support and the base frame is entrusted to a mode in which the support is erected on the upper surface of the base frame. When a load is applied from the side, the cab tilts as a whole around the lower end of the column, and there is a limit to reducing the displacement of the cab.

In order to suppress such tilting of the cab, in Patent Document 2, a contact plate is provided on each of the side surface of the vertical plate standing on the revolving frame (base frame) and the side surface of the cab in order to support the boom. And when the cab tilts in response to a load, the contact plate of the cab and the contact plate of the vertical plate are brought into contact with each other.
Japanese Patent Laid-Open No. 9-25648 JP 2001-173017 A

  In the technique of Patent Document 2, the cab to be tilted can be supported by the vertical plate by bringing both abutment plates into contact with each other. The tilt of the cab could not be suppressed, and the tilt of the cab could not be effectively suppressed.

  In particular, since the technology of Patent Document 2 employs a configuration in which a contact plate is disposed on a vertical plate, the upper end position of the vertical plate is the maximum height position where the contact plate is disposed. Since the vertical plate has a low profile so as to open the side of the cab in order to secure the field of view to the side of the operator, there is a limit to the height position at which the contact plate is disposed.

  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 provides 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 stand on the base frame. A pair of vertical plates provided, a boom that is supported by the base frame so that it can be raised and lowered by pivotally supporting a base end portion of each vertical plate inside the vertical plates, and outside the vertical plates A cab that is erected on the base frame so as to sandwich one vertical plate between the two vertical plates with the boom at a lateral position, and the boom is in a posture that makes a maximum working radius, And when the cab receives an external force directed from the side toward the boom, the cab can come into contact with the side surface of the cab before the one vertical plate at a position higher than the upper end of the one vertical plate. The contact portion provided on the boom Wherein the boom has a tapered portion formed tapered toward the tip end from the base end side when viewed from above while being a posture that makes the maximum radius, the contact portion, the When the boom is in a posture that forms the maximum working radius, the boom is disposed below the highest portion of the boom , and from the tapered portion of the boom to a side position closer to the cab than the one vertical plate An upper body of a construction machine characterized by extending.

  According to the present invention, when an external force from the side toward the boom is applied to the cab, the side surface of the cab tilted by the external force is positioned above the upper end portion of the one vertical plate with respect to the contact portion. The cab can be abutted before the one vertical plate, so that the cab is positioned at a higher position in the stage before the progress of the tilting as compared with the conventional case where the vertical plate and the cab are brought into contact with each other. Can be suppressed. Therefore, in the present invention, the tilting of the cab can be effectively suppressed.

  In particular, according to the present invention, the abutment portion and the cab can be brought into contact with each other in a state where the boom has a maximum working radius, that is, in a state where the construction machine is most likely to lose balance. Even when the vehicle falls over, tilting of the cab can be reliably suppressed.

  Specifically, the abutting portion can be constituted by an abutting member attached to the outer side surface of the boom so as to abut on the side surface of the cab.

  In this way, by adding an abutting member intended only to abut on the side surface of the cab to the boom, it is possible to suppress the tilting of the cab while maintaining the basic configuration of the existing construction machine. Become.

In the present invention, the contact portion extends from the boom to a side position closer to the cab than the one vertical plate.

As a result, the abutment portion is disposed in the closest position of the cab, so that the cab tilt distance until the cab and the abutment portion abut can be further reduced, and the tilt range of the cab can be further reduced. it can.

  Although not intended to limit the position of the abutting member, the abutting member is preferably provided on the upper surface of the boom when in a posture that forms the maximum working radius.

  In this case, unlike the case where the contact member is provided on the side surface of the boom, interference between the contact member and another configuration (for example, a boom raising / lowering cylinder) disposed between the boom and the cab. Can be easily avoided, and the contact position between the contact member and the cab can be made higher.

  On the other hand, the contact member may be formed to extend from the side surface of the boom facing the cab side toward the cab.

  In this case, since the contact member is formed to extend from the side surface of the boom, the distance for extending the contact member can be made shorter than the case where the contact member is extended from the upper surface of the boom toward the cab. The contact member itself can be made small.

  The contact member may be fixed to the boom by welding or the like, but it is particularly preferable that the contact member is fixed to the outer surface of the boom by a bolt.

  In this way, the strength of the boom itself is made as much as possible without considering the welding problem that the thickness of the steel material constituting the boom is changed by the welded portion and the stress concentration of the steel material changes. The contact member can be fixed to the outer surface of the boom while maintaining.

  The abutting member may be formed by a block-shaped member, but may be formed of a tubular member that extends from the boom toward the cab and returns from the cab toward the boom, or a plurality of pieces. It is preferable to consist of a box-shaped member formed by combining plate materials.

  If it does in this way, unlike the case where a contact part is formed with a block-shaped member, weight reduction of a contact part can be achieved by employ | adopting a hollow member.

  On the other hand, instead of adding an abutting member intended to abut on the side surface of the cab as described above, a part of the boom may be employed as the abutting portion.

  In this way, it is possible to suppress the tilting of the cab by setting the shape of the boom itself without adding a new member to the boom.

  Specifically, the boom includes a boom body supported to be able to move up and down with respect to the vertical plate, and a hydraulic pipe attached to an outer peripheral surface of the boom body, and the boom body is formed into a cylindrical shape by a plurality of plate members. In addition to being formed, the abutting portion can be constituted by a part of at least one of the plate members.

  In addition, the boom includes a boom main body supported so as to be movable up and down with respect to the vertical plate, and a hydraulic pipe attached to an outer peripheral surface of the boom main body, and the contact portion is configured by a part of the hydraulic pipe. It can also be configured.

  According to these configurations, since a part of the boom main body or hydraulic piping that is an existing component of the boom can be used as the contact portion, the cost can be reduced as compared with a case where a new member is added to the boom. can do.

  And when the said hydraulic piping is equipped with piping and the fixing tool for fixing this piping to the said boom main body, while forming the bending part bent to the cab side in the said piping, this bending part is formed. It can be used as the contact portion.

  In addition, when the hydraulic pipe includes a pipe and a fixture for fixing the pipe to the boom body, an overhang portion that projects to the cab side is formed in the fixing portion, and the overhang is formed. The part can also be used as the contact part.

  According to these structures, a part of piping or fixing tool which is a component of hydraulic piping can be utilized as a contact part.

  In the upper body, the cab includes a support column erected on the base frame and a reinforcement member connected to the support column, and the reinforcement member corresponds to a contact target portion with the contact portion. Are preferably provided.

  According to this configuration, since the abutment portion can be brought into contact with the reinforcing member in the process of tilting the cab by the external force, the tilting operation of the column connected to the base frame via the reinforcing member is regulated. can do.

  In particular, when the reinforcing member is a beam member connected to the upper end portion of the support column and supporting the ceiling portion of the cab, the contact portion can be brought into contact with the ceiling portion of the cab. By bringing the contact portion into contact with the vicinity of the uppermost portion of the cab, the tilting range of the cab can be further reduced.

  Furthermore, the present invention includes the upper body and a lower traveling body that supports the upper body, and the boom is in a undulating posture that forms a maximum working radius, and is higher than the upper ends of the vertical plates. A construction machine configured such that the side surface of the cab and the abutting portion are in contact with each other at a position where the side of the cab is tilted by an external force applied from a side opposite to the boom. provide.

  According to the present invention, when an external force from the side toward the boom is applied to the cab, the side surface of the cab tilted by the external force is positioned above the upper end portion of the one vertical plate with respect to the contact portion. The cab can be abutted before the one vertical plate, so that the cab is positioned at a higher position in the stage before the progress of the tilting as compared with the conventional case where the vertical plate and the cab are brought into contact with each other. Can be suppressed. Therefore, in the present invention, the tilting of the cab can be effectively suppressed.

  In particular, according to the present invention, the abutment portion and the cab can be brought into contact with each other in a state where the boom has a maximum working radius, that is, in a state where the construction machine is most likely to lose balance. Even when the vehicle falls over, tilting of the cab can be reliably suppressed.

  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 rotatably supported 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 contact member (contact portion) 5 provided on the boom 3. 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 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. The vertical plates 6 and 7 have a height dimension H1 for opening a side window 4a (see FIG. 2) on the side of the cab 4 in order to secure a field of view to the side (right side) of the operator in the cab 4. (See FIG. 3). 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 main body 3a and a hydraulic pipe 3b attached to the boom main body 3a (see FIGS. 12 to 15; specific configurations will be described later). The boom 3 can be undulated back and forth with respect to the base frame 2 by pivotally supporting the base end portion of the boom body 3 a between the vertical plates 6 and 7 so as to be rotatable around the boom foot pin 8. It is said that. The boom 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 cab 4 is erected on the left position of the left vertical plate (one vertical plate) 7 (the left position of the base end portion of the boom body 3 a) and 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.

  Referring to FIGS. 4 and 5, the frame member 14 includes a right front column 16, a left front column 17, a right rear column 18 and a left rear column 19 erected on the base frame 2. 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. And between these support | pillars 16-19, the auxiliary | assistant frame 20 for reinforcement is spanned in the appropriate place.

  The frame member 14 includes a right beam member 21 that connects the upper ends of the right front column 16 and the right rear column 18, a left beam member 22 that connects the upper ends of the left front column 17 and the left rear column 19, and a right A rear beam member 23 for connecting the upper ends of the rear column 18 and the left rear column 19 and three lateral beam members 24 for connecting the right beam member 21 and the left beam member 22 are provided. And it is set as the framework opened forward by each beam member 21-23. In the present embodiment, the range in front of the frame member 14 is used as a space for the driver's seat.

  In the present embodiment, the frame member 14 further includes a vertical beam member (beam member) 25 extending forward from the upper end portion of the right front column 16. The vertical beam member 25 supports a top panel 29 described later in cooperation with the beam members 21 to 24. A specific configuration of the vertical beam member 25 will be described later.

  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 right inner side that covers the columns 16 and 18 from the inside (left side) so as to face the right outside panel 26 from the left and right. A panel 27 (see FIG. 6), a left outer panel 28 that covers the columns 17 and 19 from the outside (left side), and a top panel that is arranged on the upper part of each of the beam members 21 to 25 and constitutes the ceiling of the cab 4 29. The top panel 29 includes three parts 29a to 29c.

  That is, in the present embodiment, the vertical beam member 25 is included between the right outer panel 26 and the right inner panel 27. Hereinafter, specific configurations of the outer side panels 26 and 27 and the longitudinal beam member 25 will be described.

  6 is a cross-sectional view taken along line VI-VI in FIG.

  Referring to FIG. 6, the longitudinal beam member 25 includes a right side plate 30, a left side plate 31, a top plate 32 and a bottom plate 33, and left and right end surfaces of the top plate 32 and the bottom plate 33 are on the inner side surfaces of the both side plates 30 and 31. These are welded cylindrical members. On the other hand, the right outer panel 26 and the right inner panel 27 are welded to each other at two welding positions M1 and M2, so that the vertical beam member 25 is enclosed between the panels 26 and 27. Is to be formed.

  Thus, in this embodiment, the vertical beam member 25 connected to each of the columns 16 to 19 extends to the side position of the driver's seat (above the window 4a of the cab 4).

  Referring to FIGS. 1 to 3 again, the contact member 5 is a tubular member provided on the top plate 9 of the boom body 3a. Specifically, the contact member 5 includes a first fixing portion 34 that extends to the left from the boom body 3 a, a contact portion 35 that extends rearward from the left end of the first fixing portion 34, and a rear portion of the contact portion 35. A second fixing portion 36 extending rightward from the end is formed by bending.

  The first fixing portion 34 is fixed to the top plate 9 of the boom body 3a from above by two bolts B1 and B2. The second fixing portion 36 is fixed to the top plate 9 from above with one bolt B3. Thus, in this embodiment, since the contact member 5 is being fixed to the boom main body 3a with the volt | bolts B1-B3, unlike the case where it fixes to the said boom main body 3a by welding, intensity | strength, such as stress concentration, is unstable. The abutting member 5 can be easily fixed to the boom body 3a without considering most of the factors.

  Then, the abutting member 5 is placed in the front-rear range E1 and the vertical range E2 where the vertical beam member 25 is disposed in a state where the boom 3 is in an upright posture having the maximum working radius shown in FIG. The boom body 3a is attached so that at least a part of the contact portion 35 is located.

  Further, as shown in FIG. 3, the abutting member 5 has a lateral distance D2 between the abutting portion 35 and the cab 4 rather than a lateral distance D1 between the vertical plate 7 and the cab 4. The length dimensions of the first fixing portion 34 and the second fixing portion 36 or the fixing positions of the both fixing portions 34 and 36 with respect to the boom body 3a are set so that the length is shorter. Therefore, when the cab 4 tilts to the right as described later, the side surface of the cab 4 comes into contact with the contact member 5 before the vertical plate 7.

  Hereinafter, the case where an external force in the direction indicated by the arrow Y1 from the left to the right is applied to the cab 4 will be described assuming that the hydraulic excavator rolls over to the left. FIG. 7 is a diagram showing the relationship between the load applied to the cab and the amount of displacement of the cab when this load is applied.

  1 to 3 and FIG. 7, when the excavator starts to roll over and an external force is applied to the cab 4, the cab 4 has a base portion with the base frame 2 (a base portion of each of the columns 16 to 19). Try to tilt to the right, centering on.

  As the rollover progresses, as shown in the chart T1 of FIG. 7, the cab 4 tilts (displaces) as the load increases, and the cab 4 (longitudinal beam member 25) and the abutting member 5 at the displacement point P1. (Contact part 35) contacts.

  After this displacement point P1, the cab 4 is supported not only by the respective struts 16 to 19 but also by the abutting member 5. Therefore, even if the load further increases from this state, The tilt amount (displacement amount) of the cab 4 is smaller than that before the displacement point P1. That is, even if the load increases, the cab 4 is difficult to tilt.

  Next, for comparison with the above embodiment, the tilting of the cab in a hydraulic excavator that does not have the abutting member 5 will be described with reference to the chart T2 of FIG.

  When the excavator rolls over and a load is applied to the cab 4, the amount of tilt of the cab 4 increases as the load increases. Since the abutment member 5 is not provided in this hydraulic excavator, the tilting operation of the cab 4 increases corresponding to the increase in load until the cab 4 reaches the displacement point P2 where the cab 4 abuts against the boom 3. .

  After the displacement point P2, the cab 4 is supported not only by each of the columns 16 to 19 but also by the boom 3, so even if the load further increases from this state, the cab per increase in the load is increased. The tilt amount (displacement amount) 4 is smaller than that before the displacement point P2. That is, even if the load increases, the cab 4 is difficult to tilt.

  However, the displacement point P2 of the excavator that does not have the contact member 5 comes after the cab 4 has been tilted more than the displacement point P1 of the excavator of the embodiment that has the contact member 5. . Therefore, when examining the case of absorbing the predetermined energy J, the hydraulic excavator that does not have the contact member 5 cannot absorb the energy J unless the cab 4 is displaced up to the displacement amount P4, but has the contact member 5. In a hydraulic excavator, a displacement P3 smaller than the displacement P4 is sufficient. Therefore, in the hydraulic excavator according to the above-described embodiment, the displacement amount (tilting range) of the cab 4 necessary to absorb the predetermined energy generated at the time of falling can be reduced, so that the operator's safety in the cab 4 can be reduced. Can be further increased.

  As described above, according to the embodiment, when an external force directed from the side toward the boom 3 is applied to the cab 4, the side surface of the cab 4 tilted by the external force is Since it can contact | abut before the said vertical board 7 in the position above the upper end part of the board 7, compared with the case where the vertical board 7 and the cab 4 are contact | abutted conventionally, progress of a tilting is possible. The tilt of the cab 4 can be suppressed at a higher position in the stage before the travel proceeds. Therefore, in the said embodiment, tilting of the cab 4 can be suppressed effectively.

  In particular, in the above-described embodiment, the abutting member 5 and the cab 4 can be brought into contact with each other in a state where the boom 3 is in a posture that forms the maximum working radius, that is, in a state in which the hydraulic excavator is most likely to lose balance. The tilt of the cab 4 can be reliably suppressed even when the excavator falls.

  If the contact member 5 is provided on the upper surface (top plate 9) of the boom 3 as in the above embodiment, the contact member 5 is provided between the boom 3 and the cab 4 unlike the case where the contact member 5 is provided on the side surface. Interference between the contact member 5 and other components (such as a boom hoisting cylinder) can be easily avoided, and the contact position between the contact member 5 and the cab 4 is made higher. be able to.

  If the abutting member 5 extends to a position closer to the cab 4 than the vertical plate 7 as in the above embodiment, the abutting member 5 is disposed at a position closest to the cab 4. The tilt distance of the cab 4 until the contact member 5 comes into contact with the contact member 5 can be further reduced, and the tilt range of the cab 4 can be further reduced.

  If the contact member 5 is fixed to the outer side surface (top plate 9) of the boom 3 with bolts B1 to B3 as in the above embodiment, the thickness of the steel material constituting the boom body 3a is changed by the welded portion. Then, the contact member 5 is brought into contact with the outer surface of the boom main body 3a while maintaining the strength of the boom main body 3a as much as possible without considering the welding problem that the stress concentration mode of the steel material changes. Can be fixed.

  If the pipe-shaped contact member 5 is employed as in the embodiment, unlike the case where the contact member 5 is formed by a plate-shaped or block-shaped member, the weight of the contact member 5 can be reduced. .

  If the cab 4 is configured to include the support columns 16 to 19 erected on the base frame 2 and the vertical beam member 25 connected to the right front support column 16 as in the above-described embodiment, the cab 4 is driven by an external force. Since the abutting member 5 can be brought into contact with the vertical beam member 25 in the process of tilting, the tilting operation of the right front column 16 connected to the base frame 2 via the vertical beam member 25 can be restricted. it can. In the present embodiment, the configuration in which the vertical beam member 25 is provided only on the right front column 16 has been described. However, the vertical beam member may be provided on the left front column 17, and the distal end portion and the base of these vertical beam members may be provided. A support column connecting the frame 2 may be erected on the base frame 2 in correspondence with the front position of the cab 4.

  Since the longitudinal beam member 25 that supports the top panel 29 and the abutting member 5 are brought into contact with each other as in the above-described embodiment, the abutting member 5 is placed near the uppermost portion of the cab 4. By making contact, the tilting range of the cab 4 can be further reduced.

  In the embodiment, the pipe-shaped contact member 5 is used. However, as shown in FIGS. 8 and 9, the contact member can also be attached by attaching a box-shaped (hollow) contact member to the boom 3. While the weight of the cab 4 is reduced, the tilt of the cab 4 can be suppressed.

  FIG. 8 is a view corresponding to FIG. 2 of a hydraulic excavator according to another embodiment of the present invention. 9 is a cross-sectional view taken along the line IX-IX in FIG. In addition, about the structure similar to the said embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  In the hydraulic excavator of this embodiment, the contact member 37 is attached to the left side surface of the left side plate 12 constituting the boom body 3a. The contact member 37 is formed by combining five plate members. Specifically, four end faces of each plate member are butt welded to the left side plate 12 of the boom body 3a, and a cylindrical body having an axis line in the left-right direction is formed by these four plate members. One plate material remaining at the open end (left end) of the cylindrical body is welded as a lid. Thereby, the box-shaped contact member 37 which protrudes from the boom 3 to the right side is formed.

  The abutting member 37 is provided so as to incline upward to the left in a state where the boom 3 has a maximum working radius (the state shown in FIG. 9). In this state, the tip of the contact member 37 is disposed in the front-rear range E1 and the vertical range E2 where the vertical beam member 25 (see FIG. 5) is disposed.

  Further, the abutting member 37 has a boom body 3a and a boom cylinder so as to avoid interference with a boom cylinder 38 provided between the boom 3 and the base frame 2 for raising and lowering the boom 3. 38 and above the boom cylinder 38 in a position on the base end side (boom foot pin 8 side) of the boom body 3a and in a state where the boom 3 has a maximum working radius. Placed in position.

  Also in this embodiment, the tip end portion of the contact member 37 and the vertical beam member 25 of the cab 4 can be brought into contact with each other, so that tilting of the cab 4 can be reliably suppressed even when the excavator falls. .

  In this embodiment as well, the horizontal distance D3 between the tip of the contact member 37 and the cab 4 is shorter than the horizontal distance D1 between the vertical plate 7 and the cab 4. If the contact member 37 is disposed, the cab 4 and the contact member 37 can be brought into contact with each other at an earlier stage.

  By the way, in each said embodiment, although the structure which added the contact members 5 and 37 only for the purpose of contact | abutting with the cab 4 as a member different from the boom 3 was demonstrated, a part of boom 3 is deform | transformed. Thus, the above-described effect can be obtained.

  FIG. 10 is a view corresponding to FIG. 2 of a hydraulic excavator according to another embodiment of the present invention. 11 is a cross-sectional view taken along line XI-XI in FIG. In addition, about the structure similar to the said embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  In the hydraulic excavator of this embodiment, a part of the top plate 9 constituting the boom body 3 a is projected to the left side (cab 4 side), and this is used as the contact portion 39.

  The contact portion 39 includes an extension portion 39a that extends a part of the left end surface of the top plate 9 to the left side, and a bent portion 39b that extends from the tip portion of the extension portion 39a in a direction different from the extension portion 39a. And.

  The extending portion 39a is provided so as to incline to the left in a state where the boom 3 is in a posture in which it has a maximum working radius (the state in FIG. 11). In this state, the bent portion 39b extends upward and has a posture with its surface facing left. The surface of the bent portion 39 is disposed in the front-rear range E1 and the vertical range E2 where the vertical beam member 25 (see FIG. 5) is disposed.

  Also in this embodiment, since the surface of the bent portion 39b and the vertical beam member 25 of the cab 4 can be brought into contact with each other, tilting of the cab 4 can be reliably suppressed even when the excavator falls.

  In this embodiment as well, the bent portion 39 is such that the left-right distance D4 between the surface of the bent portion 39 and the cab 4 is shorter than the left-right direction distance D1 between the vertical plate 7 and the cab 4. By arranging the cab, the cab 4 and the bent portion 39 can be brought into contact with each other at an earlier stage.

  Moreover, in each said embodiment, although the contact part 39 which deform | transformed the boom main body 3a is employ | adopted, the part which deform | transformed the hydraulic piping 3b among the components of the boom 3 is utilized as a contact part. You can also.

  FIG. 12 is a view corresponding to FIG. 2 of a hydraulic excavator according to another embodiment of the present invention. FIG. 13 is a front view of the excavator shown in FIG. In addition, about the structure similar to the said embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  The hydraulic pipe 3b includes a plurality of pipes 40 for connecting an unillustrated hydraulic pump provided on the base frame 2 and an unillustrated actuator (such as a hydraulic cylinder) provided at the tip of the boom body 3a. A clamp (fixing tool) 41 for fixing the pipe 40 to the boom body 3a is provided.

  Each pipe 40 is fixed to the top plate 9 by the clamp 41 so as to be along the surface of the top plate 9 of the boom body 3a. The leftmost one of these pipes 40 (hereinafter referred to as the pipe 42) has its middle part bent to the left. The bent portion of the pipe 42 constitutes the contact portion 42a in the present embodiment.

  That is, the abutting portion 42a includes the front-rear range E1 and the upper-lower range in which the vertical beam member 25 (see FIG. 5) is disposed in a state where the boom 3 has a maximum working radius (the state shown in FIG. 12). It is arranged in E2.

  Also in this embodiment, since the abutting portion 42a and the vertical beam member 25 of the cab 4 can be brought into contact with each other, tilting of the cab 4 can be reliably suppressed even when the hydraulic excavator falls.

  In this embodiment as well, the abutting portion 42a is arranged so that the lateral distance D5 between the vertical plate 7 and the cab 4 is shorter than the lateral distance D1 between the vertical plate 7 and the cab 4. If it arrange | positions, the cab 4 and the contact part 42a can be contact | abutted at an early stage.

  And although the said embodiment demonstrated the example which deform | transforms the piping 40 of the hydraulic piping 3b, the clamp 41 of the hydraulic piping 3b can also be utilized as a contact part.

  FIG. 14 is a view corresponding to FIG. 2 of a hydraulic excavator according to another embodiment of the present invention. FIG. 15 is a front view of the excavator shown in FIG. FIG. 16 is an exploded perspective view of the clamp 41 shown in FIG. In addition, about the structure similar to the said embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  The clamp 41 in the present embodiment includes a lower holding piece 43 and a pair of holding pieces 44 and a holding piece 45 for holding the pipes 40 between the lower holding piece 43.

  Specifically, the lower clamping piece 43 has a pair of leg portions 46 and 47 and a plate formed in a U shape in a plan view having a connecting portion 48 that connects the end portions of the leg portions 46 and 47. It is.

  The leg portion 46 is formed longer than the other leg portion 47 and sandwiches the six pipes 40, whereas the other leg portion 47 has a length that sandwiches the two pipes 40. On the other hand, the holding piece 44 has a length that can cover the leg portion 46, and the holding piece 45 has a length that can cover the leg portion 47. And these clamping pieces 44 and 45 and the leg parts 46 and 47 are formed in the position which mutually opposes, and the groove | channels 44a, 45a, 46a and 47a are formed by the number of the piping 40 each clamped, and these groove | channels 44a-47a Thus, each pipe 40 is clamped while the movement in the left-right direction is restricted.

  In this embodiment, a part of each leg part 46 and 47 is being fixed to the boom main body 3a among the said lower clamping pieces 43, and parts other than this fixed part protrude from the boom main body 3a to the left side. The projecting portion constitutes a contact portion. That is, in the state where the boom 3 has the maximum working radius (the state shown in FIG. 14), the connecting portion 48 has the longitudinal range E1 and the vertical range E2 where the vertical beam member 25 (see FIG. 5) is disposed. Is placed inside.

  Also in this embodiment, since the connecting portion 48 and the vertical beam member 25 of the cab 4 can be brought into contact with each other, tilting of the cab 4 can be reliably suppressed even when the hydraulic excavator falls.

  In this embodiment as well, the connecting portion 48 is arranged so that the distance D6 in the left-right direction between the vertical plate 7 and the cab 4 is shorter than the distance D1 in the left-right direction between the vertical plate 7 and the cab 4. By doing so, the cab 4 and the connecting portion 48 can be brought into contact with each other at an earlier stage.

  Here, in the above-described embodiment, the case where the grooves 46 a and 47 a are formed in each of the leg portions 46 and 47 of the lower clamping piece 43 has been described, but at least one of the leg portions 46 and 47 can clamp the pipe 40. Anything is acceptable.

It is a top view which abbreviate | 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 the VI-VI sectional view taken on the line of FIG. It is a figure which shows the relationship between the load added to a cab, and the displacement amount of a cab when this load is added. FIG. 3 is a view corresponding to FIG. 2 of a hydraulic excavator according to another embodiment of the present invention. It is the IX-IX sectional view taken on the line of FIG. FIG. 3 is a view corresponding to FIG. 2 of a hydraulic excavator according to another embodiment of the present invention. It is the XI-XI sectional view taken on the line of FIG. FIG. 3 is a view corresponding to FIG. 2 of a hydraulic excavator according to another embodiment of the present invention. It is a front view of the hydraulic shovel shown in FIG. FIG. 3 is a view corresponding to FIG. 2 of a hydraulic excavator according to another embodiment of the present invention. It is a front view of the hydraulic excavator shown in FIG. It is a disassembled perspective view of the clamp shown in FIG.

E1 Longitudinal range E2 Vertical range 1 Upper swing body (upper body)
2 Base frame 3 Boom 4 Cab 5 37 Contact member 6 7 Vertical plate 9 Top plate 16-19 Post 25 Vertical beam member (reinforcement member)
34 1st fixed part 35, 39, 42a Contact part 36 2nd fixed part 48 Connection part (contact part)

Claims (15)

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 pair of vertical plates erected on the base frame;
Booms that are supported so as to be raised and lowered with respect to the base frame by pivotally supporting the base end portions of the vertical plates inside the vertical plates,
A cab erected on the base frame so as to sandwich one vertical plate between the vertical plates at a lateral position that is the outside of the vertical plates;
When the boom is in a posture that forms a maximum working radius, and the cab receives an external force directed from the side toward the boom, the one vertical plate is positioned above the upper end of the one vertical plate. A contact portion provided on the boom so as to be able to contact the side surface of the cab first.
The boom has a tapered portion formed so as to taper from the proximal end side toward the distal end side when viewed from above in a state in which the boom has a maximum working radius.
The abutting portion is disposed below the highest portion of the boom when the boom is in a posture that forms a maximum working radius, and the cab from the tapered portion of the boom to the one vertical plate. An upper body of a construction machine, characterized in that it extends to a lateral position close to the machine.   The upper body of a construction machine according to claim 1, wherein the contact portion includes a contact member attached to an outer surface of the boom so as to contact a side surface of the cab.   The upper body of the construction machine according to claim 2, wherein the contact member is provided on an upper surface of the boom when in a posture that forms the maximum working radius.   The upper body of a construction machine according to claim 2, wherein the contact member extends from a side surface of the boom facing the cab toward the cab.   The upper body of the construction machine according to any one of claims 2 to 4, wherein the abutting member is fixed to the outer side surface of the boom by a bolt.   The said abutting member consists of a tubular member formed so that it may return toward the boom from the said cab while extending toward the cab from the said boom, The any one of Claims 2-5 characterized by the above-mentioned. Upper body of construction machinery.   The upper part of the construction machine according to any one of claims 2 to 5, wherein the contact member is a box-shaped member formed by combining a plurality of plate members.   The upper part of the construction machine according to claim 1, wherein the contact portion is configured by a part of the boom.   The boom includes a boom main body that is supported so as to be raised and lowered with respect to the vertical plate, and a hydraulic pipe attached to an outer peripheral surface of the boom main body, and the boom main body is formed in a cylindrical shape by a plurality of plate members. The upper part of the construction machine according to claim 8, wherein the contact portion is constituted by a part of at least one of the plate members.   The boom includes a boom main body supported to be able to undulate with respect to the vertical plate, and a hydraulic pipe attached to an outer peripheral surface of the boom main body, and the contact portion is configured by a part of the hydraulic pipe. The upper body of a construction machine according to claim 8 or 9, wherein   The hydraulic pipe includes a pipe and a fixture for fixing the pipe to the boom body. The pipe has a bent portion bent toward the cab, and the bent portion serves as the abutting portion. The upper body of the construction machine according to claim 10, which is configured.   The hydraulic pipe includes a pipe and a fixing tool for fixing the pipe to the boom body, and the fixing tool has an overhang portion that projects to the cab side, and the overhang portion is in contact with the abutment. The upper body of the construction machine according to claim 10 or 11, wherein the upper part of the construction machine is configured. The cab includes a support column erected on the base frame and a reinforcement member connected to the support column, and the reinforcement member is provided corresponding to a contact target portion with the contact portion. The upper body of the construction machine according to any one of claims 1 to 12, wherein The upper body of a construction machine according to claim 13, wherein the reinforcing member is a beam member connected to an upper end portion of the support column and supporting a ceiling portion of the cab. The upper body according to any one of claims 1 to 14, and a lower traveling body that carries the upper body, wherein the boom is in a posture that forms a maximum working radius, and the cab is laterally viewed. When receiving an external force toward the boom, the abutting portion provided on the boom abuts the side surface of the cab before the one vertical plate at a position higher than the upper end portion of the one vertical plate. Construction machine characterized by that.

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