JPH1037244A - Turning frame of construction machine - Google Patents

Turning frame of construction machine

Info

Publication number
JPH1037244A
JPH1037244A JP21549296A JP21549296A JPH1037244A JP H1037244 A JPH1037244 A JP H1037244A JP 21549296 A JP21549296 A JP 21549296A JP 21549296 A JP21549296 A JP 21549296A JP H1037244 A JPH1037244 A JP H1037244A
Authority
JP
Japan
Prior art keywords
beam
bottom plate
frame
portion
bracket
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP21549296A
Other languages
Japanese (ja)
Other versions
JP3236781B2 (en
Inventor
Kazuhiko Mizoguchi
Yutaka Onoe
Koji Tahara
晃司 多原
裕 尾上
和彦 溝口
Original Assignee
Hitachi Constr Mach Co Ltd
日立建機株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Constr Mach Co Ltd, 日立建機株式会社 filed Critical Hitachi Constr Mach Co Ltd
Priority to JP21549296A priority Critical patent/JP3236781B2/en
Publication of JPH1037244A publication Critical patent/JPH1037244A/en
Application granted granted Critical
Publication of JP3236781B2 publication Critical patent/JP3236781B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Abstract

(57) [Problem] To reduce the occurrence of high stress on the welded portion side between the overhang beam for supporting the cab and the mounting bracket of the center beam. SOLUTION: A bracket part 14A of a center beam 14 is provided.
The inclined plate portion 25A of the reinforcing member 25 is attached to the bracket portion 1 at a position facing the overhanging beam 18 for supporting the cab with the
4A and the bottom plate 13 are disposed obliquely with a certain inclination angle. Then, the lower end and the upper end of the inclined plate 25A are welded to the bottom plate 13 and the bracket 14A, respectively. The bottom plate 13 is provided at the rear end of the inclined plate portion 25A.
The angled corner between the bracket portion 14A and the inclined portion 25A
A closing plate portion 25B is provided so as to close together with the bottom plate 1B.
3 and the bracket portion 14A.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a turning frame of a construction machine suitable for use in a construction machine such as a hydraulic shovel.

[0002]

2. Description of the Related Art Generally, in a construction machine having an upper revolving structure such as a hydraulic excavator, a revolving frame forming a frame structure which is rotatably mounted on a lower traveling structure, and a cab mounted on the revolving frame. , A machine room, a counterweight and the like constitute an upper revolving superstructure. During excavation work such as earth and sand, the upper revolving superstructure is swiveled with respect to the lower traveling body, and excavation work such as earth and sand is performed by a working device provided to be capable of ascending and descending in front of the revolving frame. I have.

In addition, the revolving frame is provided with a center frame comprising a bottom plate and a pair of center beams, and a base end side is provided on each center beam side of the center frame so as to be separated from each other in front and rear directions. A plurality of overhanging beams extending outward in the width direction (left and right outwards);
It is composed of left and right side beams which extend in the front and rear directions and are joined to the leading ends of the overhang beams.

Here, the bottom plate of the center frame is formed of a thick rigid plate having high rigidity and the like, and is pivotably mounted on the round body of the lower traveling body. On the bottom plate, a pair of left and right center beams is erected so as to extend in the front-rear direction, and the front end side of each center beam is formed as a bracket for the working device.

On the other hand, of the overhanging beams, the overhanging beam for supporting the driver's cab, which is provided on the bracket side of the center beam, has its base end welded to the bottom plate and the bracket, and the center beam of the overhanging beam is provided. To increase the mounting strength. The overhanging beam for supporting the operator's cab is configured to support a relatively heavy operator's cab together with the side frame from the lower side at the tip end side.

[0006]

In the above-described swivel frame according to the prior art, an overhanging beam for supporting the cab is provided at the base end side with the bottom plate of the center frame in order to stably support the cab from below. The beam is fixed to the bracket portion by welding, and the distal end side of the projecting beam is fixed to the side frame by welding, so that the mounting strength of the projecting beam to the bottom plate and the bracket portion is increased.

However, if the turning of the upper revolving unit is stopped, or if earth, sand, rocks, or the like collides with a bucket or the like of the working device during the turning of the upper revolving unit, the working device is attached to the bracket portion of each center beam. The load in the lateral direction from the bottom may act as a bending load, and the bracket may be largely elastically deformed leftward and rightward (see FIG. 3).

For this reason, in the prior art, when a large bending load is applied to the bracket portion of the center beam, a high stress is generated in the welding portion between the overhanging beam for the driver's cab and the bracket portion, and the welding portion is However, there is a problem in that it is difficult to sufficiently increase the durability and life of the device.

The present invention has been made in view of the above-mentioned problems of the prior art, and the present invention can secure a sufficient strength by firmly welding an overhanging beam for supporting a cab to a bracket portion of a center frame. It is another object of the present invention to provide a revolving frame of a construction machine capable of preventing a high stress from being generated in the welded portion and improving durability and life of the welded portion.

[0010]

In order to solve the above-mentioned problems, the present invention has a pair of left and right center beams erected on a bottom plate, and the front end of each center beam is used for a working device. The center frame as the bracket part, the base end side is welded to the bottom plate of the center frame and the bracket part of the center beam, and the front end side is joined to the side frame to support the cab together with the side frame from below. And an overhanging beam for supporting the operator's cab.

A feature of the structure adopted in the first aspect of the present invention is that a base end of the overhang beam is provided between the bottom plate of the center frame and a bracket portion of the center beam with the bracket portion interposed therebetween. A reinforcing member is fixed to a position facing the side by welding, and the reinforcing member is configured to receive a bending load acting on the bracket portion between the base member and the overhanging beam.

With this configuration, the base end side of the overhanging beam and the reinforcing member can be arranged at positions facing each other with the bracket portion of the center beam interposed therebetween.
Accordingly, the bracket portion can be supported by being sandwiched between the base end side of the overhanging beam and the reinforcing member from both sides. Therefore, even when a bending load from a working device or the like greatly acts on the bracket portion, such a bending load Can be reliably received between the base end side of the overhanging beam and the reinforcing member. As a result, it is possible to suppress the occurrence of stress concentration in the welded portion between the bracket portion and the overhanging beam and the welded portion between the bottom plate of the center frame and the overhanging beam, and to reliably reinforce these welded portions with the reinforcing member. can do.

[0013] In the second aspect of the present invention, the reinforcing member has one end welded to a bottom plate of the center frame and the other end welded to a lower end of a bracket portion of the center beam. It is configured to be disposed obliquely with a fixed inclination angle between the bracket and the bracket.

As a result, the reinforcing member can function as a beam member having a triangular structure between the bracket and the bottom plate, and the mechanical strength of the reinforcing member against bending load from the bracket can be increased. .

Further, according to the third aspect of the present invention, the reinforcing member includes an inclined plate portion extending obliquely between the bottom plate and the bracket portion, and the bottom plate and the bracket located before and after the inclined plate portion. And a closing plate portion that closes the corner between the first and second portions together with the inclined plate portion.

As a result, the reinforcing member can be fixed to the bottom plate and the bracket portion in a state where the corner side between the bottom plate and the bracket portion is closed between the inclined plate portion and the closing plate portion. Can be blocked by the closing plate of the reinforcing member.

[0017]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIGS. 1 to 7 show an example in which the turning frame according to the first embodiment of the present invention is applied to a hydraulic shovel.

In FIG. 1, reference numeral 1 denotes an undercarriage, and 2 denotes an upper revolving body which is provided on the undercarriage 1 via a revolving device 3 so as to be capable of turning. Frame 4 forming a frame structure, and the frame 4
It is roughly composed of an operator's cab 5, a machine room 6, and a counterweight 7 mounted on the upper side. Reference numeral 8 denotes a working device provided at the front of the upper swing body 2 so as to be able to move up and down, and the working device 8 is generally constituted by a boom 9, an arm 10 and a bucket 11.

Next, the revolving frame 4 will be described in detail with reference to FIGS.

In the figure, reference numeral 12 denotes a center frame provided substantially at the center of the turning frame 4;
2 to 5, as shown in FIGS. 2 to 5, a flat plate is formed from a high-rigidity steel plate or the like extending in a substantially rectangular shape in the front and rear directions. And a center beam 14, 15, which will be described later, provided on the bottom plate 13 so as to be separated to the left and right.

At the front end side of the bottom plate 13, a portion extending leftward in the width direction from the welding position of the center beam 14 in FIG. 2 becomes a mounting plate portion 13B. It constitutes a mounting margin for 18, 19 and the like.

Reference numerals 14 and 15 denote a pair of left and right center beams erected on the revolving frame 4 so as to be spaced apart from each other in the width direction.
After) formed from an elongated steel sheet that extends along the direction,
The lower end is fixed to the bottom plate 13 by welding.
Each of the center beams 14, 15 has a front end portion serving as a bracket portion 14A, 15A for the boom 9, and the base end side of the boom 9 is pin-connected between the bracket portions 14A, 15A to perform work. The device 8 is attached to each of the bracket portions 14A and 15A so as to be able to move up and down. As shown in FIGS. 4 and 5, the bracket portion 14A has a corner portion 14B having a substantially L-shaped cross section with the bottom plate 13.
It has become.

Reference numeral 16 denotes a support located at the front end side of the center frame 12 and provided between the center beams 14 and 15. The support 16 is, as shown in FIGS.
The lower plate is formed by bending a flat steel plate into a substantially “U” shape, and the lower end thereof is fixed to the upper surface of the front part of the bottom plate 13 by welding. The support 16 is located on the left,
The right ends are the brackets 14 of the center beams 14, 15.
A and 15A are fixed by welding. Here, the support 16 is provided at its lower end with the inclined plate portion 25 of the reinforcing member 25.
A is a part partitioned into a triangular shape by A.
Is a closing plate portion 16A on the front side, which constitutes a part of the above.

Reference numeral 17 denotes a support frame for the operator's cab 5 projecting forward from the bottom plate 13 of the center frame 12.
2 has a substantially L-shape as shown in FIG. 2, and has one end fixed to the mounting plate 13B of the bottom plate 13 by welding at the front end. The other end of the support frame 17 extends leftward in FIG. 2 at a position forward of the bottom plate 13, and the tip end is fixed to a front end of a side frame 23 described later by welding.

Reference numeral 18 denotes a first overhanging beam which is located on the rear side of the support frame 17 and supports the operator's cab 5 from below with the support frame 17 as a driver's cab supporting overhanging beam. As shown in FIGS. 2 to 5, an upper plate portion 18A made of a substantially rectangular flat plate and a pair of side plate portions 18B, 18B having substantially the same shape as the upper plate portions 18A have a substantially U-shaped cross section. It is formed as an elongated plate body.

Here, the upper plate portion 18 of the overhang beam 18
A and the side plate portions 18B have a base end side having a bracket portion 14A of the center beam 14 and a mounting plate portion 13B of the bottom plate 13.
Are fixed to each other by welding, and the bracket portion 14A
A welded portion 18C is formed between the upper plate portion 18A and the upper plate portion 18A as shown in FIGS. Also, as shown in FIG. 2, the tip side of the overhanging beam 18 protrudes outward from the mounting plate portion 13B of the bottom plate 13 by a certain dimension in the width direction of the center beam 14, and
The protruding end side is fixed to the side frame 23 by welding.

Reference numeral 19 denotes a second overhanging beam formed substantially in the same manner as the overhanging beam 18. The overhanging beam 19 has a base end side, as shown in FIG. Each is fixed to the mounting plate portion 13B by welding, and the distal end side extends substantially parallel to the overhang beam 18. The overhanging beam 19 is fixed to the side frame 23 at the front end together with the support frame 17 and the overhanging beam 18, and the heavy operator cab 5 and the like take a so-called “cantilever support beam structure” and are positioned below the center frame 12. It is configured to support from.

Numerals 20 and 20 denote third overhanging beams provided at the rear side of the center beam 14 so as to be separated from each other before and after. Each of the overhanging beams 20 is formed substantially in the same manner as the overhanging beam 19, and Each overhanging beam 20 has its proximal end fixed to the center beam 14 by welding or the like, and its distal end extends substantially parallel to the overhanging beams 18 and 19 and is joined to the side frame 23. Each overhanging beam 20 supports the machine room 6, the counterweight 7, and the like, together with the side frame 23, from below the center frame 12.

.. Designate a fourth overhanging beam provided at the front end side of the center beam 15 and separated from each other in the front and rear directions. The overhanging beam 21 has a base end side welded to the center frame 12 side. The tip side extends outward in the width direction of the center beam 14 and is joined to a side frame 24 described later. Each overhanging beam 21 has a "cantilever support beam structure" together with the side frame 24, and supports, for example, a relatively light tool box or the like from below with respect to the center frame 12.

Therefore, it is not necessary to increase the mounting strength of each overhanging beam 21 to the center frame 12 as much as the overhanging beam 18.
1 is welded only to the bottom plate 13 side, and is disposed at a position slightly away from the bracket portion 15A of the center beam 15.

Reference numerals 22, 22,... Denote fifth overhanging beams provided apart from each other in the front and rear directions from the center to the rear side of the center beam 15.
The base end side is fixed to the center beam 15 side by welding or the like, and the front end side extends outward in the width direction of the center frame 12 and is joined to the side frame 24. Each of the overhanging beams 22 supports the machine room 6 and the counterweight 7 and the like together with the side frames 24 from below with respect to the center frame 12 similarly to the overhanging beams 20.

Reference numeral 23 denotes a left side frame extending in the front-rear direction. As shown in FIGS. 2 and 3, the side frame 23 is formed of an elongated plate having a substantially D-shaped cross section. Each overhanging beam 18,1
9 and 20 are fixed to the tip side. Reference numeral 24 denotes a right side frame extending in the front-rear direction so as to be parallel to the side frame 23. The side frame 24 is formed substantially in the same manner as the side frame 23, and each overhang beam 2
It is fixed to the front end side of the first and second 22. The side frames 23 and 24 together with the center frame 12 and the overhang beams 18, 19, 20, 21, 22 and the like constitute a revolving frame 4 which forms a frame structure.

Reference numeral 25 denotes a bracket 1 of the center beam 14.
4A shows a reinforcing member disposed at a position opposed to the overhang beam 18 with the 4A interposed therebetween. The reinforcing member 25 is formed as shown in FIGS. A substantially rectangular inclined plate portion 25A having a constant plate width along the direction and extending obliquely at a constant inclination angle in the left and right directions between the bracket portion 14A and the bottom plate 13;
A substantially triangular rear blocking plate 25B is bent from the rear end of the inclined plate 25A into a substantially L-shape, and is disposed to face the closing plate 16A of the support 16 in the front and rear directions. It is composed of The closing plate portion 25B, together with the closing plate portion 16A and the inclined plate portion 25A, closes the corner 14B between the bottom plate 13 and the bracket portion 14A in a liquid-tight manner.

Here, the inclined plate portion 25A has a lower end portion on one end side fixed to the bottom plate 13 by welding, and an upper end portion (left end portion) on the other end side projects with the bracket portion 14A interposed therebetween. It is fixed at a position facing the beam 18 by welding. Similarly, the front end of the inclined plate portion 25A is fixed by welding the support 16. The oblique plate portion 25B is also used for the closing plate portion 25B.
Similarly to the case A, the lower end serving as one end and the left end serving as the other end are respectively a bottom plate 13 and a bracket 14A.
To the reinforcing member 2 by welding or other means.
Reference numeral 5 denotes a configuration for blocking intrusion of rainwater or the like into the corner 14B.

Further, as shown in FIG.
The base end side of the bracket portion 14A is supported by being sandwiched from both the left and right sides between the overhanging beam 18 and a beam member having a triangular structure is formed between the bracket portion 14A and the bottom plate 13. ing. In this case, the upper end of the inclined plate portion 25A is connected to the upper plate portion 18 of the overhang beam 18.
It is preferable to attach to the bracket portion 14A at a height position corresponding to A. When a bending load is applied to the bracket portion 14A as indicated by a virtual line in FIG. 3, the reinforcing member 25 receives the bending load with the overhanging beam 18 and reinforces the bracket portion 14A. It is.

The hydraulic excavator according to the present embodiment has the above-described configuration, and when excavating soil or the like, the upper revolving unit 2 including the revolving frame 4, the cab 5, the machine room 6, and the counterweight 7 is revolved. The center beam 14, 1 is swiveled with respect to the undercarriage 1 via the device 3.
Excavation work such as earth and sand is performed by a working device 8 provided on the bracket portions 14A and 15A of the 5 (the revolving frame 4) so as to be able to move up and down.

Here, each of the overhang beams 18, 19,
A heavy driver's cab or the like is mounted on each of the overhang beams 18 and 19 among 20, 21 and 22. For this reason, each of the overhanging beams 18 and 19 has its base end side welded to the mounting plate portion 13B of the bottom plate 13 having a fixed plate width, and
The base end face is attached to the bracket portion 14 of the center beam 14.
A is welded to A to thereby increase the mounting strength of the overhang beams 18, 19 with respect to the center beam 14.

By the way, the turning of the upper revolving unit 2 is stopped, or when the upper revolving unit 2 is turned, earth and sand, rocks or the like collide with the working device 8. As shown in FIG. 7, when a lateral load acts in the direction indicated by the arrow F, the brackets 14A,
15A is the bending load from the working device 8, for example, FIG.
As shown by the imaginary line in the inside, elastic deformation may occur, and as a result, the bending load acts on the welded portion 18C between the bracket portion 14A and the overhanging beam 18 as a high stress.

However, in this embodiment, the center beam 14
The inclined plate portion 2 of the reinforcing member 25 is located at a position facing the overhang beam 18 for supporting the driver's cab with the bracket portion 14A therebetween.
5A is disposed obliquely at a fixed inclination angle between the bracket portion 14A and the bottom plate 13, the lower end portions of the inclined plate portion 25A and the closing plate portion 25B, and the inclined plate portion 25A and the closing plate portion. Bracket part 14A on the left end with 25B
Further, since it is fixed to the bottom plate 13 by welding, the following operation and effect can be obtained.

That is, the reinforcing member 25 is attached to the bracket portion 14A.
And the bottom plate 13 function as a beam member having a triangular structure. Even when the bending load acts on the bracket portion 14A as described above, the bending load is applied between the overhanging beam 18 and the reinforcing member 25. It is possible to reliably receive the sheet through the bottom plate 13 or the like. Then, the base end side of the bracket portion 14A can be supported so as to be sandwiched between the overhanging beam 18 and the reinforcing member 25 from both sides, so that high stress is reliably prevented from being generated at the welding portion 18C of the overhanging beam 18. be able to.

Therefore, in the present embodiment, even when a bending load from the working device 8 acts on the bracket portions 14A and 15A, the high stress generated in the welded portion 18C between the bracket portion 14A and the overhang beam 18 and the like can be effectively prevented. Can be reduced
The durability and life of the welded portion 18C and the like can be greatly improved.

Further, a corner portion 14 located between the bottom plate 13 and the bracket portion 14A of the center beam 14 at a deep position.
B is reliably closed from the outside by the closing plate portion 16A of the support 16 and the inclined plate portion 25A and the closing plate portion 25B of the reinforcing member 25, so that rainwater, muddy water, or the like enters the corner 14B side. Corners 14
Rust and the like can be prevented from being generated on B and the like,
Cleaning work of the bottom plate 13 and the like can be easily performed between the bracket portions 14A and 15A.

Next, FIG. 8 shows a second embodiment of the present invention. In this embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. I do. However, the feature of this embodiment is that the inclined plate portion 3
Reinforcing member 31 having 1A and closing plate portions 31B, 31C
And the closing plate portion 31C also serves as the closing plate portion 16A of the support 16 described in the first embodiment.

Here, the reinforcing member 31 is formed substantially in the same manner as the reinforcing member 25 described in the first embodiment, and has the inclined plate portion 31A and the closing plate portion 31B.
The reinforcing member 31 is formed by bending a single flat plate material into a substantially U-shape, and is substantially the same as the closing plate portion 31B (the closing plate portion 16A of the support 16) on the front end side of the inclined plate portion 31A. A closing plate portion 31C having a shape is integrally formed.

The inclined plate portion 31A and the closing plate portions 31B, 31C have lower ends, which are one end sides, of the bottom plate 1A.
3 is fixed by welding or the like, and the left end portion on the other end side is an upper plate portion 18A of the overhang beam 18 respectively.
At a position substantially corresponding to the side plate portion 18B, the center beam 14 is fixed to the lower end side of the bracket portion 14A by welding or the like.

Thus, also in this embodiment constructed as described above, the bending load acting on the bracket portion 14A of the center beam 14 can be reliably received between the overhang beam 18 and the reinforcing member 31. The reinforcing member 31 can reliably reinforce the bracket portion 14A,
The corner 14B between the bottom plate 13 and the centaboom 14 can be reliably closed from the outside, so that substantially the same operation and effect as in the first embodiment can be obtained.

Particularly, in this embodiment, since the closing plate 31C is integrally provided on the reinforcing member 31 at the front end side of the inclined plate 31A, the inclined plate 31A and the closing plate 31B,
By 31C, the bending load from the bracket portion 14A can be more reliably received on the bottom plate 13, the mechanical strength of the entire reinforcing member 31 against the bending load can be further increased, and the welding portion 18C of the overhang beam 18 and the like can be further improved. Can be further effectively reinforced by the reinforcing member 31.

In each of the above-described embodiments, each of the reinforcing members 25 (31) is connected to the inclined plate 25A (31A) and the closing plate 2
5B (31B, 31C), or alternatively, for example, it may be formed from a triangular or square pillar-shaped solid block, or may be a triangular or square hollow. It may be formed by a box.

Further, the obstruction plate portion 25B (31B, 31C) is omitted from each reinforcing member 25 (31), and the inclined plate portion 25A is omitted.
(31A) alone or the inclined plate portion 25A (3
1A) may be omitted and only the closing plate portion 25B (31B, 31C) may be used. Even in these cases, the operation and effect of the present invention can be sufficiently obtained.

Further, in each of the above-described embodiments, the cab 5 is provided on the left side. However, the present invention is not limited to this, and an overhang beam similar to the overhang beam 18 is provided on the bracket portion 15A side of the center beam 15. In addition to this, a reinforcing member similar to the reinforcing member 25 (31) may be provided at a position facing the overhanging beam with the bracket portion 15A interposed therebetween.

Furthermore, in each of the embodiments described above, the hydraulic excavator has been described as an example, but the present invention is not limited to this.
For example, the present invention can be applied to various working machines such as a hydraulic crane.

[0053]

As described above in detail, according to the first aspect of the present invention, the reinforcing member is fixed by welding to the position facing the base end side of the overhang beam for supporting the cab with the bracket portion interposed therebetween. Since the reinforcing member is configured to receive the bending load acting on the bracket portion between the reinforcing member and the base end side of the overhang beam, the bracket portion and the cab are caused by the bending load acting on the bracket portion from the outside. It is possible to effectively reduce the occurrence of high stress in the welded portion with the support overhanging beam, and to greatly improve the durability and life of the welded portion.

According to the second aspect of the present invention, the reinforcing member is disposed obliquely at a fixed inclination angle between the bottom plate and the bracket portion, and one end and the other end of the reinforcing member are respectively centered. Since the welding is performed on the bottom plate of the frame and the lower end side of the bracket portion, the reinforcing member can function as a beam member forming a triangular structure between the bracket portion and the bottom plate, and thereby the reinforcing member against bending load from the bracket portion The reinforcing member can more effectively reinforce the welded portion between the bracket portion and the overhang beam.

According to the third aspect of the present invention, the reinforcing member includes an inclined plate portion extending obliquely between the bottom plate and the bracket portion, and the bottom plate and the bracket portion located before and after the inclined plate portion. Between the bottom plate and the bracket, so that rainwater, muddy water, and the like enter the corner between the bottom plate and the bracket. It is possible to reliably shut off by the plate portion, it is possible to suppress the generation of rust and the like at the corners and the like, and it is possible to easily perform the work of cleaning the bottom plate between the bracket portions.

[Brief description of the drawings]

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

FIG. 2 is an enlarged plan view showing a revolving frame before mounting a driver's cab, a machine room, and the like in FIG. 1;

FIG. 3 is an enlarged sectional view taken in the direction of arrows III-III in FIG. 2;

FIG. 4 is an enlarged perspective view showing a center frame, an overhang beam, a reinforcing member, and the like in FIG. 2;

FIG. 5 is an enlarged sectional view showing a main part in FIG. 3;

6 is an enlarged perspective view showing a reinforcing member in FIG. 4;

FIG. 7 is a perspective view of the hydraulic shovel showing a state in which a lateral load acts on a bucket.

FIG. 8 is a perspective view similar to FIG. 6, showing a reinforcing member provided on a turning frame according to a second embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 4 Revolving frame 5 Operator's cab 8 Working device 12 Center frame 13 Bottom plate 14, 15 Center beam 14A, 15A Bracket portion 14B Corner 16 Support 16A Closure plate 18 Overhanging beam 23, 24 Side frame 25, 31 Reinforcement member 25A, 31A Inclined plate 25B, 31B, 31C Closed plate

Claims (3)

[Claims]
1. A center frame having a pair of left and right center beams erected on a bottom plate, the front end of each of the center beams being a bracket for a working device, and the base end being a center frame of the center frame. A construction machine comprising: a bottom plate and a bracket portion of the center beam; and an extension beam for supporting a driver's cab supporting the driver's cab from the lower side together with the side frame by joining a front end side to the side frame. In the revolving frame, a reinforcing member is fixed by welding between a bottom plate of the center frame and a bracket portion of the center beam at a position facing the base end side of the overhanging beam with the bracket portion interposed therebetween, and The member is configured to receive a bending load acting on the bracket portion between the member and a base end of the overhanging beam. Frame.
2. The reinforcing member has one end welded to a bottom plate of the center frame and the other end welded to a lower end of a bracket portion of the center beam, and has a predetermined inclination between the bottom plate and the bracket portion. The revolving frame of a construction machine according to claim 1, wherein the revolving frame is disposed obliquely at an angle.
3. The reinforcing member includes an inclined plate portion extending obliquely between the bottom plate and a bracket portion,
3. The revolving frame of a construction machine according to claim 2, further comprising a closing plate portion which is located rearward and closes a corner between the bottom plate and the bracket portion together with the inclined plate portion.
JP21549296A 1996-07-26 1996-07-26 Construction machine swivel frame Expired - Fee Related JP3236781B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP21549296A JP3236781B2 (en) 1996-07-26 1996-07-26 Construction machine swivel frame

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP21549296A JP3236781B2 (en) 1996-07-26 1996-07-26 Construction machine swivel frame

Publications (2)

Publication Number Publication Date
JPH1037244A true JPH1037244A (en) 1998-02-10
JP3236781B2 JP3236781B2 (en) 2001-12-10

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
JP21549296A Expired - Fee Related JP3236781B2 (en) 1996-07-26 1996-07-26 Construction machine swivel frame

Country Status (1)

Country Link
JP (1) JP3236781B2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6703759B2 (en) * 2002-01-21 2004-03-09 Mitsubishi Denki Kabushiki Kaisha Alternator
WO2012026233A1 (en) 2010-08-26 2012-03-01 日立建機株式会社 Construction machine
EP2642032A4 (en) * 2010-11-15 2018-03-21 Hitachi Construction Machinery Co., Ltd. Construction machine swing frame

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6703759B2 (en) * 2002-01-21 2004-03-09 Mitsubishi Denki Kabushiki Kaisha Alternator
WO2012026233A1 (en) 2010-08-26 2012-03-01 日立建機株式会社 Construction machine
EP2642032A4 (en) * 2010-11-15 2018-03-21 Hitachi Construction Machinery Co., Ltd. Construction machine swing frame

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