JP2001173017A - Construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the strength of a cab guard by dispersing the external force applied to the cab guard. SOLUTION: A frame side abutting plate 22 is provided on the outside face of the left vertical plate 8 of a revolving frame 4, and a guard side attached plate 23 is provided to face the frame side attached plate 22 on the inside face of the rear column 19B of the cab guard 17. When an external force is applied to the cab guard 17 at a turnover or the like, the right and left front columns 18A, 19A and rear columns 18B, 19B constituting the cab guard 17 are deformed with their fitting portions serving as fulcrums to absorb the external force. The guard side attached plate 23 is allowed to abut on the frame side attached plate 22, a rear column 19C or the like is deformed in the vicinity of the height position of this contact portion serving as a fulcrum, thereby the large external force can be absorbed by the deformation of two different positions without concentrating stress at the fitting portions of columns.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a construction machine such as a hydraulic shovel or a hydraulic crane having a cab guard for protecting a cab box so as to surround the cab box.

[0002]

2. Description of the Related Art In general, hydraulic shovels, hydraulic cranes and the like are known as construction machines. The hydraulic shovel is generally constituted by a lower traveling body and an upper revolving body pivotally mounted on the lower traveling body, and a working device is provided at a front portion of the upper revolving body so as to be able to elevate. ing.

[0003] The upper revolving unit includes a revolving frame having a bottom plate provided with a revolving device and the like, left and right vertical plates extending forward and rearward on the bottom plate, and a front frame on the revolving frame. Cab box in which the driver's seat, various operation levers, and the like are disposed inside, and the cab box is located on the rear side of the cab box on the revolving frame. It is roughly constituted by the mounted engine, counterweight and the like.

[0004] In addition, the hydraulic excavator works not only in a place where the road surface is flat, but also in an unstable place such as irregular terrain or sloping terrain. The cab box may be damaged by the fall and the impact of the fall. Further, since rocks may fall or trees and pillars may fall down at the work site, the cab box may be damaged by collision of these rocks, trees, and the like.

[0005] For this reason, some excavators have a cab guard on a turning frame to protect the cab box (operator) against an external force caused by a fall or a collision of a rock or the like (for example, an actual shovel). 5-4
2352, JP-A-8-142785, etc.).

A cab guard provided on a conventional hydraulic excavator is provided with left and right front columns erected on a revolving frame at a front side of the cab box and at a rear side of the cab box. It is roughly constituted by left and right rear pillars erected on the revolving frame, and left and right upper horizontal beams and the like positioned above the cab box and connecting the front pillar and the rear pillar. The left and right front and rear pillars are
The lower end is fixed to the revolving frame side by welding, bolts or the like.

[0007]

Incidentally, in the above-mentioned conventional hydraulic excavator, a cab guard is provided to protect the cab box from an impact such as a fall. However, the cab guard is configured such that only the lower ends of the left and right front columns and the rear columns are fixed to the turning frame.

[0008] For this reason, the external force acting on the cab guard when the vehicle falls down is concentrated on the portion of each pillar that is attached to the revolving frame, and the attached portion is greatly deformed and damaged. Therefore, since the cab guard is made of a thick and strong material in order to increase the strength of the mounting portion of the front pillar and the rear pillar, the entire cab guard becomes large, increasing the weight and increasing the assembly workability. This leads to problems such as a decrease in cost and an increase in cost.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to increase the strength of a cab guard by dispersing an external force acting on the cab guard, thereby reducing the weight of the cab guard. An object of the present invention is to provide a construction machine capable of improving assembly workability and reducing costs.

[0010]

A revolving construction machine according to the present invention comprises a frame including a bottom plate and left and right vertical plates extending frontward and rearward on the bottom plate, and a frame of the frame. A cab box disposed on the frame at a position outside of one of the left and right vertical plates in the left and right directions, and the cab box for protecting the cab box against external force And a cab guard provided on the frame so as to surround the frame.

[0011] In order to solve the above-mentioned problem, the feature of the invention adopted in claim 1 is that a frame side contact portion is provided on an outer surface facing a cab box on a vertical plate of a frame, and a cab guard is provided. The cab guard is provided with a guard-side contact portion that comes into contact with the frame-side contact portion when the cab guard is deformed left and right by an external force.

With this configuration, when an external force acts on the cab guard and the cab guard is pressed against the vertical plate of the frame, the cab guard is first deformed with the portion attached to the frame as a fulcrum. The external force at this time is absorbed. When the external force continues to act on the cab guard, the guard-side contact portion of the cab guard comes into contact with the frame-side contact portion of the vertical plate of the frame. As a result, the cab guard almost stops deformation of the mounting portion, and starts to be deformed with the vicinity of the guard side contact portion as a fulcrum, so that external force can be absorbed also in the vicinity of the guard side contact portion,
A large external force can be absorbed by two different deformations.

A feature of the structure adopted by the invention of claim 2 is that the vertical plate of the frame is located on the outer surface facing the cab guard, and the cab guard is deformed left and right by external force. This is because a frame-side contact portion that contacts the cab guard is provided.

With this configuration, when an external force is applied to the cab guard, the cab guard is deformed with the fulcrum near the position where the frame-side abutting portion abuts. A large external force can be absorbed by the deformation at two places near the contact part.

Further, a feature of the structure adopted by the invention of claim 3 is that the cab guard is located on the inner side surface facing the vertical plate of the frame and the cab guard is deformed left and right by external force. There is provided a guard-side contact portion that contacts the vertical plate.

With this configuration, when an external force acts on the cab guard, the cab guard is deformed around the guard-side contact portion as a fulcrum, so that the mounting portion of the cab guard and the guard-side contact portion are deformed. A large external force can be absorbed by the deformation at two places with the vicinity.

According to the fourth aspect of the present invention, the contact portion is provided with a cushioning member for reducing an impact at the time of contact.

With this configuration, the shock when the contact portion contacts another contact portion, the frame, and the cab guard can be reduced by the cushioning member, so that the vertical plate of the cab guard and the frame is damaged. Can be prevented.

According to the fifth aspect of the present invention, the cab guard is provided with the left and right front pillars standing on the frame at the front side of the cab box and the cab guards standing on the frame at the rear side of the cab box. Left and right rear pillars, and left and right upper transverse beams positioned above the cab box and connecting the front pillar and the rear pillar, and the guard-side abutting portions are left and right rear pillars. Among them, it is provided on the rear pillar located inside.

With this configuration, when the cab guard is pressed against the vertical plate of the frame, the guard-side contact portion provided on the rear pillar of the cab guard is provided on the vertical plate of the frame or the vertical plate. Since the abutment portion contacts the frame-side abutment portion, the rear pillar or the like can be deformed with the vicinity of the position where the frame-side abutment portion abuts as a fulcrum, thereby absorbing external force.

According to the sixth aspect of the present invention, the cab guard is provided on the left and right front pillars standing on the frame at the front side of the cab box, and standing on the frame at the rear side of the cab box. The left and right rear pillars, the left and right upper transverse beams positioned above the cab box and connecting the front pillar and the rear pillar, and the left and right lateral beams located below the upper transverse beams. The right front pillar and the rear pillar are provided with an intermediate horizontal beam connecting the inner front pillar and the rear pillar, and one or more guard-side abutting portions are provided on the front pillar, the rear pillar, and the intermediate horizontal beam. It is in.

With this configuration, when the cab guard is pressed against the vertical plate of the frame, one or more guard-side contact portions provided on the front pillar, the rear pillar, and the intermediate cross beam of the cab guard are provided. Abuts on the vertical plate of the frame or the frame-side abutting portion provided on the vertical plate, so that the rear pillar or the like is deformed around the position where the frame-side abutting portion abuts to absorb external force. be able to. Further, when the rear column is deformed, the front column connected to the rear column via the intermediate horizontal column is also deformed together, so that an external force can be absorbed.
Further, when a plurality of guard-side contact portions are provided, each contact portion can share an external force.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A construction machine according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings, taking a hydraulic shovel as an example.

First, a first embodiment of the present invention will be described with reference to FIGS.

Reference numeral 1 denotes a lower traveling body of a hydraulic excavator, and 2 denotes an upper revolving body mounted on the lower traveling body 1 via a revolving device 3 so as to be capable of turning.

Here, the upper swing body 2 will be described.
The upper revolving unit 2 includes a revolving frame 4 and a cab box 16 described later mounted on a front left side of the revolving frame 4.
An outer cover 5 provided from the right front side of the revolving frame 4 to the rear side of the cab box 16 and covering an engine, a control valve group, a fuel tank, a hydraulic oil tank (all not shown), and the like. It is roughly constituted by a counterweight 6 mounted on the rear end of the revolving frame 4.

As shown in FIG. 3, the revolving frame 4 is made of a thick steel plate and extends in the front and rear directions.
Left vertical plate 8 standing in front of the center
A right vertical plate 9 which is arranged on the right side of the left vertical plate 8 with a space therebetween and extends frontward and rearward on the bottom plate 7, and three right overhangs from the left vertical plate 8 to the left. Overhang beam 10A,
10B, 10C, two projecting beams 11A, 11B projecting rightward from the right vertical plate 9, and a projecting beam 1 on the left side.
A left side beam 12 joined to the front ends of 0A, 10B, 10C and extending forward and backward, and a right side beam 13 joined to the front ends of the right overhang beams 11A, 11B and extending front and rear. , Left overhanging beam 1
Cab support beam 14 protruding forward from zero
This is roughly configured.

Here, the left and right vertical plates 8, 9 are angled portions 8A, 9A whose front portions protrude upward, respectively.
The rear side extends so as to be gradually lower. A horizontal plate 15 is provided between the chevron portions 8A, 9A of the vertical plates 8, 9 so as to be gradually lowered toward the front side.
Accordingly, each of the vertical plates 8 and 9 has strength against an external force acting in the left and right directions. Further, pin insertion portions 8B and 9B are provided above the mountain portions 8A and 9A, to which pins (not shown) for supporting a boom 25 of a working device 24 to be described later so as to be able to move upward and downward are provided. Cylinder brackets 8C and 9C for supporting the boom cylinder 26 are provided on the lower front side.

Reference numeral 16 denotes a cab box disposed on the front left side of the revolving frame 4. The cab box 16 is formed by, for example, welding and fixing a plurality of press-formed steel plates. And cab box 1
4 and 5, as shown in FIGS. 4 and 5, the front plate 16A, the rear plate 16B, the left side plate 16C, the right side plate 16D, and the ceiling plate 16E form a box shape, and the door 16F is attached to the left side plate 16C so as to be openable and closable. Have been. Further, a floor plate (not shown) is provided on the bottom surface of the cab box 16,
A driver's seat, various operation levers (all not shown) and the like are arranged on the floor plate.

Reference numeral 17 denotes a cab guard provided on the revolving frame 4 so as to surround the cab box 16, and the cab guard 17 is made of a strong square pipe material or the like.
Left and right portal frames 18, 19, connecting beams 20, 2 to be described later.
1 roughly.

Numeral 18 denotes a left-side gate frame provided on the left side of the cab box 16.
A, a front pillar 18A erected on the front side of A, a rear pillar 18B erected on the rear side of the rear face plate 16B, and a front pillar 18A and a rear pillar 18B extending in the front and rear directions above the ceiling plate 16E. Are formed in a substantially U-shape that opens downward with an upper cross beam 18C connecting the two.

Reference numeral 19 denotes a right gate frame provided on the right side of the cab box 16, and the gate frame 19 is formed on the front plate 16A similarly to the left gate frame 18 described above. The front pillar 19A erected on the front side, the rear pillar 19B erected on the rear side of the rear face plate 16B, and the front pillar 19A and the rear pillar 19B extend forward and rearward above the ceiling board 16E to connect the front pillar 19A and the rear pillar 19B. Upper beam 1
9C form a substantially U-shape that opens downward.

Further, reference numerals 20 and 21 denote a left-side gate frame 18.
The upper connecting beam 20 is fixed to the upper ends of the rear pillars 18B and 19B at both ends extending in the left and right directions. Have been. As shown in FIG. 6, both ends of the lower connecting beam 21 are fixed to the rear pillars 18B and 19B at substantially the same height as a guard-side contact plate 23 described later.

The cab guard 17 thus configured is connected to the front pillars 18A, 19A of each of the portal frames 18, 19.
The lower end is fixed to the cab support beam 14 of the revolving frame 4 by welding, bolting, or the like, and the rear pillars 18B, 19
The lower end of B is fixed to the overhang beam 10B by welding, bolting, or the like. Thereby, cab guard 1
Numeral 7 is provided so as to surround the cab box 16, and can protect the cab box 16 even if the hydraulic excavator falls down to the left side or a rock, a tree, or the like collides.

Reference numeral 22 denotes a left vertical plate 8 constituting the turning frame 4
The contact plate 22 is located, for example, on the rear side of the pin insertion portion 8B and closer to the upper side of the chevron 8A, and the cab box 1
6 is fixed to the outer surface side (left surface) of the chevron portion 8A by fixing means such as welding. The frame-side contact plate 22 is made of a thick rectangular steel plate or the like as shown in FIG. 7, and its thickness dimension is appropriately changed according to the model, so that a guard-side contact plate 23 to be described later is formed. And the distance can be adjusted.

On the other hand, reference numeral 23 denotes a rear pillar 1 of the right gate frame 19.
9B is a guard-side abutting plate as a guard-side abutting portion. The abutting plate 23 is a metal plate 23A provided on the rear pillar 19B and a rubber as an elastic member provided on the metal plate 23. And a plate 23B.

Therefore, the metal plate 23A is fixed to the inner surface side (right surface) of the rear column 19B by a fixing means such as welding so as to face the frame side contact plate 22. The metal plate 23A is made of a thick rectangular steel plate or the like.
Can be adjusted according to the model.

The rubber plate 23B is formed in substantially the same rectangular shape as the metal plate 23A so as to cover the surface of the metal plate 23A, and is fixed by means such as baking, bonding, and screwing.

As shown in FIG. 8, the guard side contact plate 23 comes into contact with the frame side contact plate 22 when the cab guard 17 is deformed rightward (to the left vertical plate 8 side) by an external force F. It is. In addition, the rubber plate 23B reduces the impact when the guard-side contact plate 23 contacts the frame-side contact plate 22, and prevents the cab guard 17, the left vertical plate 8, and the like from being damaged.

A working device 24 is provided on the front side of the upper revolving unit 2 so as to be able to move upward and downward. The working device 24 is attached to the left and right vertical plates 8 and 9 of the turning frame 4 so as to be able to move upward and downward. The boom 25, an arm (not shown) attached to the tip of the boom 25 so as to be able to ascend and descend, and a bucket (not shown) pivotally attached to the tip of the arm. It is configured. 2, two boom cylinders 26 are provided between the cylinder brackets 8C and 9C of the vertical plates 8 and 9 and the boom 25, and an arm is provided between the boom 25 and the arm. A cylinder (not shown) is provided, and a bucket cylinder (not shown) is provided between the arm and the bucket.

The hydraulic shovel according to the present embodiment has the above-described configuration, and its operation will be described next.

First, the operator gets into the cab box 16 and operates the operation lever or the like to move the lower traveling body 1 or operate the work device 24 to perform earth excavation work or the like. In addition, the hydraulic excavator may work on uneven or sloping terrain, and in such a site, there is a possibility that the excavator may fall over due to an operation error or the like. However, in the present embodiment, the cab guard 16 can protect the cab box 16.

The function of the cab guard 17 for protecting the cab box 16 will now be described.

When the excavator falls to the left,
Since the cab guard 17 collides with the ground or the like in place of the cab box 16, an external force F acts on the cab guard 17 rightward as shown by an arrow in FIG. At this time, the external force F is applied to the front pillar 18A and the rear pillar 18B of the left portal frame 18 and the front pillar 19A and the rear pillar 19 of the right portal frame 19.
B (A lower end part) 18A attached to the revolving frame 4
1, 18B1, 19A1 and 19B1 and act to bend this portion, so that the cab guard 17 is attached to the mounting portion 18A1 of each of the columns 18A, 18B, 19A and 19B.
, 18B1, 19A1, and 19B1 as a fulcrum, the external force F can be absorbed.

The columns 18A, 18A,
When 18B, 19A, and 19B are deformed by a predetermined amount, the guard-side contact plate 23 provided on the right rear column 19B comes into contact with the frame-side contact plate 22 provided on the left vertical plate 8. Thereby, the deformation of the mounting portions 18A1, 18B1, 19A1, 19B1 of the columns 18A, 18B, 19A, 19B can be substantially stopped.

Further, when an external force F is applied, as shown in FIG. 8, each column 18A, 18B, 1
9A and 19B begin to be deformed with the supporting points 18A2, 18B2, 19A2 and 19B2 near the height position of the guard-side contact plate 23, which is the contact portion between the guard-side contact plate 23 and the frame-side contact plate 22. The external force F can be absorbed by this deformation.

Here, as in the comparative example shown in FIG.
The cab guard 17 ′ without the frame-side contact plate 22 and the guard-side contact plate 23 has a mounting portion 18 of each column 18 ′ 19 ′ with respect to the turning frame 4 when an external force F is applied.
Since only the A1 ', 18B1', 19A1 ', and 19B1' are deformed with the fulcrum as a fulcrum, this portion is greatly bent, and the cab box 16 cannot be protected.
A1 ', 18B1', 19A1 ', and 19B1' may be damaged.

However, in this embodiment, even if the hydraulic excavator falls down, the cab guard 17 can absorb a large external force F by deforming two different points in the height direction. It can protect against damage and also allows each pillar 18 of the cab guard 17
A, 18B, mounting portions 18A1, 18A of 18A, 19B
It is possible to prevent a situation in which B1, 19A1 and 19B1 are damaged.

As described above, according to the present embodiment, when the external force F acts on the cab guard 17, the front column 18A and the rear column 18B of the left portal frame 18, and the right portal frame 18 1
Nine front pillars 19A and rear pillars 19B are attached to mounting portions 18A1,
8B1, 19A1, 19B1 and 18A2, 18B2, 19A2, 19B2 near the height position of the guard side contact plate 23 can be deformed as fulcrums, and stress concentrates on the mounting portion as in the comparative example. Can be prevented, and a large external force F can be absorbed at these two different points.

As a result, the reliability of the cab guard 17 can be improved, and even if the strength of the square pipe material used for the portal frames 18 and 19 is reduced, the strength of the cab guard 17 as a whole against the external force F is reduced. The cab guard 17 is lightened, the assembling workability is improved,
Costs can be reduced.

The guard-side contact plate 23 has a metal plate 2
Since the rubber plate 23B is provided on the surface of 3A and the rubber plate 23B can reduce the impact when the rubber plate 23B comes into contact with the frame-side contact plate 22, the vertical plate 1
1. The cab guard 17 can be prevented from being damaged, and the durability can be improved.

Further, the frame side contact plate 22 is provided using the left vertical plate 8 of the revolving frame 4, and the guard side contact plate 23 is provided.
Can be provided by using the rear column 19B of the cab guard 17, so that the existing hydraulic excavator can easily be provided with the frame-side contact plate 22 and the guard-side contact plate 23.

Next, a second embodiment of the present invention will be described with reference to FIG.
As will be described in detail with reference to FIG. 11 and FIG. 11, a feature of the present embodiment is that an intermediate horizontal beam is provided which connects a front pillar and a rear pillar located on the lower side of the upper horizontal beam and located inside, and is provided with a guard side contact. A plurality of parts are provided on the front pillar, the rear pillar, and the intermediate cross beam. In the present embodiment, the same components as those in the above-described first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

Reference numeral 31 denotes a turning frame according to the present embodiment which is used in place of the turning frame 4 according to the first embodiment. Reference numeral 32 denotes a left vertical plate 32 of the turning frame 31. As shown in FIG. 11, substantially in the same manner as the left vertical plate 8 according to the first embodiment, the front portion is a chevron 32A protruding upward, and the rear side is gradually reduced. However, the left vertical plate 32 according to the present embodiment differs from the first embodiment in that the angled portion 32A extends in a high state to the front portion and the cylinder bracket portion 32B is integrally formed at the distal end side. It is different from the left vertical plate 8.

A cab guard 33 according to the present embodiment is used in place of the cab guard 17 according to the first embodiment. The cab guard 33 is substantially the same as the cab guard 17 according to the first embodiment. Similarly, it is constituted by a left-side gate frame 34, a right-side gate frame 35, and a connecting beam 36.

Here, the right gate frame 35 is substantially the same as the portal frame 19 according to the first embodiment, and the front pillar 35
A, the rear pillar 35B and the upper cross beam 35C. However, the right-side gate frame 35 according to the present embodiment is used.
Is different from the right-side gate frame 19 according to the first embodiment in that an intermediate horizontal beam 35D is provided below the upper horizontal beam 35C and connects the front column 35A and the rear column 35B. ing.

Reference numeral 37 denotes a first frame-side contact plate as a frame-side contact portion provided on the angled portion 32A of the left vertical plate 32, and the corresponding contact plate 37 is a first guard-side contact plate described later. 3
9 is fixed to the outer side (left side) rear side of the chevron 32A by a fixing means such as welding.

On the other hand, reference numeral 38 denotes a second frame-side abutting plate as a frame-side abutting portion which is located on the front side of the frame-side abutting plate 42 and is provided on the angled portion 32A of the left vertical plate 32.
The contact plate 38 is fixed to the outer side (left surface) of the angled portion 32A near the front side so as to face a second guard-side contact plate 40 described later.

Reference numeral 39 denotes a first guard-side contact plate as a guide-side contact portion provided on the rear pillar 35B of the right gate frame 35, and the corresponding contact plate 39 is a metal plate 39A and a rubber plate 39B. And is fixed to the inner surface side (right surface) of the rear pillar 35B so as to face the first frame-side contact plate 37.

Reference numeral 40 denotes a second guard-side contact plate as a guard-side contact portion provided on the intermediate cross beam 35D of the right-side gate frame 35. The corresponding contact plate 40 is formed of a metal plate 40A and a rubber. It is fixed to the inner surface side (right surface) of the intermediate cross beam 40D so as to face the second frame side contact plate 38.

Thus, according to the present embodiment configured as described above, the left vertical plate 32 of the revolving frame 31 includes:
The first frame-side contact plate 37 is spaced apart in the front and rear directions.
And a second frame-side abutment plate 38, a first guard-side abutment plate 39 is provided on the rear pillar 35B of the portal frame 35 of the cab guard 33, and a second guard is provided on the intermediate cross beam 35D. The configuration is such that the side contact plate 40 is provided. Thus, the contact portion between the first frame-side contact plate 37 and the first guard-side contact plate 39 and the second frame-side contact plate 38 and the second guard-side contact plate 40 Since the external force can be received by sharing the two portions with the contact portion, a large external force can be absorbed, and the reliability can be improved.

Further, the middle cross beam 3 is attached to the right gate frame 35.
Since the 5D is provided, the position of the guard-side contact plates 39 and 40 can be freely set in the front and rear directions by using the intermediate cross beam 35D.

Next, a third embodiment of the present invention will be described with reference to FIG.
As will be described in detail according to the present embodiment, the feature of the present embodiment is that the cab guard is located on the outer side surface facing the cab guard on the vertical plate of the frame, and the cab guard is deformed left and right by external force. That is, a frame-side contact portion to be contacted is provided. In the present embodiment, the same components as those in the first embodiment are given the same reference numerals,
The description is omitted. In the present embodiment, a contact plate is not provided on the gate frame 19 of the cab guard 17.

Reference numeral 51 denotes a frame-side contact plate as a frame-side contact portion provided on the left vertical plate 8 according to the present embodiment.
The contact plate 51 includes a metal plate 51A and a rubber plate 51B. Here, the metal plate 51A is used to maintain the distance between the rear column 19 of the cab guard 17 and the rear pillar 19 at a predetermined size due to the elimination of the guard-side contact plate 23 provided in the first embodiment. It is formed thick.

The frame-side contact plate 51 directly contacts the rear pillar 19 of the cab guard 17 when the cab guard 17 is deformed rightward (to the left vertical plate 8 side).

Thus, according to the present embodiment configured as described above, the guard-side contact plate 23 can be eliminated, so that the number of parts can be reduced, and the workability of assembly and the cost can be reduced. Can be planned.

Next, a fourth embodiment of the present invention will be described with reference to FIG.
As described in detail according to this embodiment, the feature of the present embodiment is that the cab guard is located on the inner side surface facing the vertical plate of the frame, and the cab guard is deformed to the left or right by an external force. That is, a guard-side contact portion that comes into contact with the contact member is provided. In the present embodiment, the same components as those in the above-described first embodiment are denoted by the same reference numerals, and description thereof will be omitted. In the present embodiment, no contact plate is provided on the left vertical plate 8 of the turning frame 7.

Reference numeral 61 denotes a guard-side contact plate as a guard-side contact portion according to the present embodiment provided on the rear pillar 19B of the gate frame 19 on the right side of the cab guard 17.
Is the guard-side contact plate 2 according to the first embodiment described above.
Like in the case of No. 3, it is composed of a metal plate 61A and a rubber plate 61B. However, the guard-side abutment plate 61 according to the first embodiment differs from the guard-side abutment plate 23 according to the first embodiment in that the thickness dimension of the metal plate 61A is formed thick for the following reason. Are different.

That is, the metal plate 61A is formed in the first embodiment in order to maintain the distance from the left vertical plate 8 at a predetermined size by eliminating the frame-side contact plate provided in the first embodiment. The guard side contact plate 23 according to the first embodiment is formed to be thicker than the metal plate 23A.

The guard-side contact plate 61 directly contacts the left vertical plate 8 of the turning frame 7 when the cab guard 17 is deformed rightward (to the left vertical plate 8 side).

Thus, according to the present embodiment configured as described above, the frame-side abutting plate can be eliminated, so that the number of parts is reduced, the assembling workability is improved, and the cost is reduced. be able to.

In the first embodiment, the frame-side contact plate 22 is fixed to the left vertical plate 8 by welding, and the guard-side contact plate 16 is fixed to the rear pillar 19B of the cab guard 17 by welding. However, the present invention is not limited to this. For example, the contact plate and the left vertical plate, and the contact plate and the rear pillar may be integrally fixed using a screw member. This configuration can be applied to the second, third, and fourth embodiments.

In the first embodiment, the guard-side contact plate 23 is constituted by a metal plate 23A and a rubber plate 23B. In the second embodiment, the guard-side contact plates 39, 4 are provided.
0 are metal plates 39A, 40A and rubber plates 39B, 4 respectively.
0B has been described as an example,
The present invention is not limited to this, and a configuration may be adopted in which a rubber plate is provided on the frame-side contact plate, or a rubber plate may be fixed to both the frame-side contact plate and the guard-side contact plate.

On the other hand, in each of the embodiments, the case where the rubber plates 23B, 39B and 40B are used as the elastic members has been exemplified. Other elastic members may be used.

In the second embodiment, the case where two frame-side contact plates 37 and 38 and two guard-side contact plates 39 and 40 are provided has been described as an example. However, the present invention is not limited to this. For example, one or three or more contact plates may be provided. Further, one of the frame-side contact plate and the guard-side contact plate is a single contact plate that is long in the front and rear directions, and the single contact plate is provided with a plurality of the other contact plates. It is good also as a structure which abuts a contact plate.

Further, in the embodiment, the excavator is described as an example of a construction machine, but the present invention is not limited to this, and can be applied to other construction machines such as a hydraulic crane.

[0077]

As described in detail above, according to the first aspect of the present invention, the vertical plate of the frame is provided with a frame-side contact portion on the outer surface facing the cab box, and the cab guard is provided with the cab guard. Since the guard-side contact portion is provided to contact the frame-side contact portion when deformed left and right by external force, an external force acts on the cab guard, and the cab guard presses against the vertical plate side of the frame. When it is done,
The cab guard can be deformed by using a portion attached to the frame as a fulcrum, and can absorb an external force at this time.
When the external force continues to act on the cab guard, the guard-side contact portion of the cab guard comes into contact with the frame-side contact portion of the vertical plate of the frame. It can be stopped, and this time, the deformation starts with the vicinity of the guard-side contact portion as a fulcrum, and the external force can be absorbed also in the vicinity of the guard-side contact portion.

As a result, two different portions of the cab guard are deformed, and a large external force can be absorbed by the deformation, so that the reliability of the cab guard can be improved. Moreover, even if the strength of the material forming the cab guard is reduced, the strength of the cab guard as a whole against external force can be increased.
It is possible to improve the assembly workability, reduce the cost, and the like.

According to the second aspect of the present invention, the vertical plate of the frame is located on the outer surface facing the cab guard, and is applied to the cab guard when the cab guard is deformed left and right by an external force. Since the frame-side contact portion is provided so as to be in contact with the cab guard, similarly to the first aspect of the invention, when an external force acts on the cab guard, the cab guard is deformed around the position where the frame-side contact portion abuts as a fulcrum. It is possible,
A large external force can be absorbed by the deformation of the cab guard at two locations, that is, the portion where the cab guard is attached and the portion near the contact portion. In addition, since the guard-side contact portion can be omitted, the number of components can be reduced.

Further, according to the third aspect of the present invention, the cab guard is located on the inner side surface facing the vertical plate of the frame, and is attached to the vertical plate when the cab guard is deformed left and right by an external force. Since the guard-side abutting portion to be abutted is provided, similar to the first aspect of the invention, when an external force acts on the cab guard, the cab guard can be deformed around the guard-side abutting portion as a fulcrum, A large external force can be absorbed by the deformation of the cab guard at the two locations, that is, the mounting portion and the vicinity of the guard-side contact portion. In addition, since the frame-side contact portion can be omitted, the number of components can be reduced.

According to the fourth aspect of the present invention, since the contact portion is provided with the cushioning member for reducing the impact at the time of contact, the contact portion contacts another contact portion, the frame, and the cab guard. Since the shock at the time can be reduced by the cushioning member,
The cab guard and the vertical plate of the frame can be prevented from being damaged, and the durability can be improved.

According to the fifth aspect of the present invention, the cab guard is provided with the left and right front pillars standing on the frame in front of the cab box and the cab guard standing on the frame behind the cab box. The left and right rear pillars are provided, and the left and right upper cross beams which are located above the cab box and connect the front pillar and the rear pillar are provided. Since the cab guard is pressed against the vertical plate side of the frame, the guard-side abutting portion provided on the rear column of the cab guard is provided on the rear plate located on the inner side of the column. The frame can be brought into contact with the frame-side contact portion provided on the vertical plate, and the rear pillar or the like can be deformed with the vicinity of the position where the frame-side contact portion comes into contact as a fulcrum, thereby absorbing external force. As described above, since the guard-side contact portion can be provided by using the rear pillar, the guard-side contact portion can be easily provided in the existing hydraulic shovel.

According to the sixth aspect of the present invention, the cab guard is provided on the left and right front pillars standing on the frame at the front side of the cab box, and is provided on the frame at the rear side of the cab box. The left and right rear pillars, the left and right upper transverse beams positioned above the cab box and connecting the front pillar and the rear pillar, and the left and right lateral beams located below the upper transverse beams. The right front pillar and the rear pillar include an intermediate horizontal beam connecting the front pillar and the rear pillar located inside, and one or more guard-side abutting portions are provided on the front pillar, the rear pillar, and the intermediate horizontal beam. Therefore, when the cab guard is pressed against the vertical plate side of the frame, one or more guard-side contact portions provided on the front pillar, the rear pillar and the intermediate horizontal beam of the cab guard are attached to the vertical board of the frame or the vertical pillar. It can abut on the frame-side abutment provided on the plate, Contact portion to deform the rear pillar or the like in the vicinity of the contact position as a fulcrum can be absorbed external force. Further, when the rear column is deformed, the front column connected to the rear column via the intermediate horizontal column can be deformed together, so that a larger external force can be absorbed. further,
When a plurality of guard-side contact portions are provided, each contact portion can share an external force.

[Brief description of the drawings]

FIG. 1 is a front view showing a hydraulic excavator applied to a first embodiment of the present invention.

FIG. 2 is a plan view showing a hydraulic excavator.

FIG. 3 is an external perspective view showing a revolving frame.

FIG. 4 is a partially broken external perspective view showing a front portion of the upper revolving structure in a state where a working device is omitted.

FIG. 5 is an external perspective view showing a state in which a cab box and a cab guard are attached to a turning frame.

FIG. 6 is a view showing the positional relationship between the frame-side contact plate provided on the vertical plate of the revolving frame and the guard-side contact plate provided on the rear pillar of the cab guard, as viewed from the direction indicated by arrows VI-VI in FIG. It is an expanded sectional view.

FIG. 7 shows a frame-side contact plate and a guard-side contact plate as a left vertical plate,
FIG. 7 is an enlarged cross-sectional view of a main part, viewed from a direction indicated by arrows VII-VII in FIG. 6 together with a rear pillar.

FIG. 8 is an enlarged sectional view of a state in which a large external force acts on the cab guard as viewed from the same position as in FIG. 6;

FIG. 9 is an enlarged cross-sectional view of a state in which an external force acts on a cab guard having no contact plate as viewed from the same position as in FIG. 6 as a comparative example.

FIG. 10 is a plan view showing a hydraulic excavator applied to a second embodiment of the present invention.

FIG. 11 is a partially broken external perspective view showing a front portion of the upper revolving structure in a state where a working device is omitted.

FIG. 12 is an enlarged sectional view showing a frame-side contact plate according to a third embodiment of the present invention from the same position as in FIG. 6;

FIG. 13 is an enlarged sectional view showing a guard-side contact plate according to a fourth embodiment of the present invention from the same position as in FIG.

[Explanation of symbols]

2 Upper revolving structure 4,31 Revolving frame 7 Bottom plate 8,32 Left vertical plate 9 Right vertical plate 16 Cab box 17,33 Cab guard 18,19,34,35 Gate frame 18A, 19A, 35A Front column 18A1,18B1 , 19A1, 19B1 Attachment portions 18A2, 18B2, 19A2, 19B2 Near the height position of guard-side contact plates 18B, 19B, 35B Rear pillars 18C, 19C, 35C Upper horizontal beams 22, 51 Frame-side contact plates (frame-side contact plates) 23, 61 Guard-side contact plate (guard-side contact portion) 23B, 39B, 40B, 51B, 61B Rubber plate (elastic member) 35D Intermediate cross beam 37 First frame-side contact plate (frame-side contact portion) ) 38 Second frame-side contact plate (frame-side contact portion) 39 First guard-side contact plate (guard-side contact portion) 40 Second guard-side contact plate (guard) Side contact)

Claims (6)

[Claims] 1. A frame comprising a bottom plate and left and right vertical plates extending frontward and rearward on the bottom plate, and one of the left and right vertical plates of the frame. A cab box disposed on the frame and located on the outer side in the left and right directions; and a cab guard provided on the frame so as to surround the cab box to protect the cab box against external force. A construction machine comprising: a vertical plate of the frame provided with a frame-side abutting portion on an outer surface facing the cab guard, wherein the cab guard is deformed left and right by an external force. And a guard-side abutting portion that abuts on the frame-side abutting portion. 2. A frame comprising a bottom plate and left and right vertical plates extending forward and backward on the bottom plate, and one of the left and right vertical plates of the frame. A cab box disposed on the frame and located on the outer side in the left and right directions; and a cab guard provided on the frame so as to surround the cab box to protect the cab box against external force. A construction machine comprising: a vertical plate of the frame, which is located on an outer surface facing the cab guard and which is in contact with the cab guard when the cab guard is deformed left and right by an external force. A construction machine having a contact portion. 3. A frame including a bottom plate and left and right vertical plates extending frontward and rearward on the bottom plate, and one of the left and right vertical plates of the frame. A cab box disposed on the frame and located on the outer side in the left and right directions; and a cab guard provided on the frame so as to surround the cab box to protect the cab box against external force. In the construction machine, the cab guard is located on an inner surface facing the vertical plate of the frame, and the cab guard is in contact with the vertical plate when the cab guard is deformed left and right by an external force. A construction machine having a contact portion. 4. The construction machine according to claim 1, wherein said contact portion is provided with a cushioning member for reducing an impact at the time of contact. 5. The cab guard is provided on left and right front columns erected on the frame at a front side of the cab box, and erected on the frame at a rear side of the cab box. Left and right rear pillars, and left and right upper cross beams which are located above the cab box and connect the front pillar and the rear pillar. 4. The method according to claim 1, wherein the rear pillar is provided on an inner side of the pillar.
Construction machinery according to the above. 6. The left and right front pillars erected on the frame at a front side of the cab box, and the cab guards are erected on the frame at a rear side of the cab box. Left and right rear pillars, left and right upper transverse beams which are located above the cab box and connect the front pillar and the rear pillar, and the left and right upper transverse beams which are located below the upper transverse beams. An intermediate horizontal beam connecting the front and rear pillars located inside of the right front and rear pillars is provided, and one or more guard side contact portions are provided on the front, rear, and intermediate horizontal beams. Claim 1
Or the construction machine according to 3.