JP7059866B2 - Floor members of work machines and work machines equipped with them - Google Patents

Description

The present invention relates to a floor member constituting a floor portion of a cab fixed on a swivel frame of a work machine and a work machine provided with the floor member.

Conventionally, as a floor member of this type, for example, a cab for construction machinery having a thick floor plate having a plate thickness of about 9 mm, as in Patent Document 1, has been known. In this cab for construction machinery, the floor plate is made of thick plates to eliminate small cans such as nuts and reduce the man-hours for cans.

On the other hand, for example, as in Patent Document 2, a floor member made of a thin plate having a plate thickness of about 2.3 mm is also known.

Japanese Unexamined Patent Publication No. 2006-5625 Japanese Patent Application Laid-Open No. 2015-151801

However, if the floor plate as in Patent Document 1 is made of a thick plate, there is a problem that the man-hours for can making are reduced, but the mass is increased and it is difficult to handle, and the man-hours for machining are increased and the cost is increased.

Further, when the floor member is made of a thin plate as in Patent Document 2, a large number of reinforcing members must be provided in order to increase the rigidity, which increases the cost. On the other hand, there is a problem that welding distortion is likely to occur when the reinforcing member is welded.

The present invention has been made in view of this point, and an object of the present invention is to secure rigidity while reducing unnecessary reinforcement without increasing the thickness of the floor plate.

In order to achieve the above object, in the present invention, the left and right edges of the floor plate are bent, and a beam reinforcing portion is provided at an optimum position.

Specifically, in the first invention, it is premised on the floor member constituting the floor portion of the cab fixed on the swivel frame of the work machine.
The above floor members
A floor plate with a driver's seat placed in the middle of the front and rear, with the left and right edges bent,
An anterior cross beam reinforcing portion and a rear cross beam reinforcing portion, which are provided on the back surface of the floor plate at intervals in the front-rear direction and extend to the vicinity of the left and right edge portions of the floor plate,
It is provided with a left vertical beam reinforcing portion and a right vertical beam reinforcing portion which are fixed to the back surface of the floor plate at intervals on the left and right, and whose front and rear end portions are connected to the front side beam reinforcing portion and the rear side beam reinforcing portion.
A pedestal fastening portion for fastening the pedestal of the driver's seat is provided directly above the left vertical beam reinforcing portion and the right vertical beam reinforcing portion.
At least one of the front beam reinforcing portion and the rear cross beam reinforcing portion is provided with a cab fastening portion for fastening the bottom portion of the cab.

According to the above configuration, the vertical beam reinforcing portions are fixed to the left and right of the pedestal of the driver's seat where the load is most likely to be applied to the floor member, and the front and rear ends of these left and right vertical beam reinforcing portions are connected to the cross beam reinforcing portions, and the front and rear are connected. By extending the left and right ends of the cross beam reinforcement to the left and right edges of the floor plate, the load applied to the driver's seat is transmitted over a wide range, and stress concentration can be avoided. Moreover, by tightening at least one of the cross beam reinforcing portions together with the bottom of the cab, the load of the driver's seat can be shared by the box structure including the cab. Therefore, even if the wall thickness of the floor plate is reduced, the load applied to the driver's seat can be borne by the box structure including the cab, so that reinforcement is less and the welding process for that purpose is also reduced. Further, since at least one of the cross beam reinforcing portions is fastened together with the bottom portion of the cab, rigidity is ensured without welding the bent portions of the left and right edge portions and the cross beam reinforcing portions.

In the second invention, in the first invention,
When viewed from the left-right direction, the height of the left vertical beam reinforcing portion and the right vertical beam reinforcing portion gradually decreases toward the front side, and the height of the front cross beam reinforcing portion is lower than the height of the rear cross beam reinforcing portion. Configured to be low in height,
The pedestal fastening portion is provided on the rear side of the left vertical beam reinforcing portion and the right vertical beam reinforcing portion.

According to the above configuration, by lowering the height of the front side of the left vertical beam reinforcement part and the right side vertical beam reinforcement part, which have a relatively small load, not only the mass can be reduced, but also the painting area is reduced, and the hydraulic piping, etc. Piping becomes easier.

In the third invention, in the first or second invention,
An intermediate cross beam reinforcing portion is fixed to the portion of the left vertical beam reinforcing portion and the right vertical beam reinforcing portion where the pedestal fastening portion is provided so as to connect the left vertical beam reinforcing portion and the right vertical beam reinforcing portion. There is.

According to the above configuration, the area around the driver's seat is more reliably reinforced.

In the fourth invention, in any one of the first to third inventions,
The cab fastening portion in the front cross beam reinforcing portion and the rear cross beam reinforcing portion is provided in an extension portion extending toward the driver's seat installation area between the front cross beam reinforcing portion and the rear cross beam reinforcing portion.

According to the above configuration, the cab fastening portion is provided in the reinforced and highly rigid driver's seat installation area between the front cross beam reinforcing portion and the rear cross beam reinforcing portion, so that the driver's seat installation area has a box structure with a cab added. And the rigidity is improved. In this way, the reinforcing portion is intensively provided in the driver's seat installation area where reinforcement is required.

The work machine of the fifth invention includes the floor member of any one of the first to fourth inventions and the floor member of the fifth invention.
The driver's seat fixed to the pedestal fastening part and
It is provided with the cab fixed to the cab fastening portion.

According to the above configuration, by providing the driver's seat in the highly rigid driver's seat installation area composed of the cab and the floor member, a highly commercial work machine in which safety and quietness are ensured can be obtained.

As described above, according to the present invention, the pedestal of the driver's seat is fastened directly above the left vertical beam reinforcing portion and the right vertical beam reinforcing portion provided on the floor plate whose left and right edges are bent, and these are used. By providing a cab fastening portion for fastening the bottom of the cab to at least one of the front beam reinforcing portion and the rear cross beam reinforcing portion to be connected, unnecessary reinforcement can be reduced without increasing the thickness of the floor plate. , Rigidity can be ensured.

It is a bottom view which shows the floor member of the work machine which concerns on embodiment of this invention. It is a top view which shows the floor member of the work machine which concerns on embodiment of this invention. FIG. 3 is an enlarged cross-sectional view taken along the line III-III of FIG. FIG. 2 is an enlarged sectional view taken along line IV-IV of FIG. It is a top view which shows the fastening position of a cab and a driver's seat. It is an exploded perspective view which shows a cab, a floor member, a mount member, and a swivel frame. It is a side view which shows the work machine which concerns on embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. It should be noted that the following description of the preferred embodiment is essentially merely an example and is not intended to limit the present invention, its application or its use. In some figures, the up / down and front / back / left / right directions are indicated by arrows. Unless otherwise specified, the directions such as up and down will be described according to the directions indicated by these arrows.

As shown in FIG. 7, the work machine 1 is, for example, a hydraulic excavator, and includes a crawler type lower traveling body 2 and an upper rotating body 3 rotatably mounted on the lower traveling body 2. An attachment 5 for performing excavation work or the like is attached to the front central portion of the swivel frame 4 of the upper swivel body 3. For example, a bucket 5a is attached to the attachment 5. A cab 6 is arranged on the left side of the attachment 5 on the swivel frame 4.

As shown in FIG. 6, a floor member 10 constituting the floor portion of the cab 6 is fastened and fixed to a portion on the left front side of the swivel frame 4 of the work machine 1 via a mount member 8.

The floor member 10 includes a floor plate 11 on which a driver's seat 50 is placed in the middle of the front and rear, and the left and right edge portions 12 are bent. The floor plate 11 is made of, for example, a pressed steel plate having a thickness of 3.2 mm, and the left and right edge portions 12 are bent in a U-shaped cross section so as to be enlarged in FIG. 4 to show a cross section. .. It may simply be bent in an L shape. By setting the plate thickness to 3.2 mm, for example, the width of the bent portion of the left and right edge portions 12 can be reduced as compared with the case where the plate thickness is 6 mm. Further, the occurrence of strain is suppressed as compared with the thin steel plate having a plate thickness of 2.3 mm.

As shown in FIG. 1, on the back surface of the floor plate 11, a front cross beam reinforcing portion 13 and a rear cross beam reinforcing portion 14 extending to the vicinity of the left and right edge portions 12 of the floor plate 11 are provided at intervals in the front and rear, respectively. There is.

Further, on the back surface of the floor plate 11, the left vertical beam reinforcing portion 15 and the right vertical beam reinforcing portion 16 having the front and rear end portions connected to the front side cross beam reinforcing portion 13 and the rear side cross beam reinforcing portion 14 are spaced left and right. Is welded. A pedestal fastening portion 20 for fastening the pedestal 52 of the driver's seat 50 is provided directly above the left vertical beam reinforcing portion 15 and the right vertical beam reinforcing portion 16. As shown in FIG. 6, the driver's seat 50 includes, for example, a seat body 51 and a pedestal 52 that supports the seat body 51 so as to be slidable back and forth, and a seat mounting bolt 20a is attached to a fixing bracket 52a of the pedestal 52. Can be inserted and fixed to the pedestal fastening portion 20. In the present embodiment, as shown in FIG. 1, the left and right end portions are in the middle portion in the front-rear direction of the left vertical beam reinforcing portion 15 and the right vertical beam reinforcing portion 16, and the left and right end portions are in the left vertical beam reinforcing portion 15 and the right vertical beam reinforcing portion 16, respectively. The connected intermediate cross beam reinforcing portion 17 is welded. The pair of pedestal fastening portions 20 on the front side are provided in the vicinity of the intermediate cross beam reinforcing portion 17.

The front beam reinforcing portion 13 and the rear beam reinforcing portion 14, the left vertical beam reinforcing portion 15, the right vertical beam reinforcing portion 16 and the intermediate cross beam reinforcing portion 17 are made of thin steel plates and are fixed to the back surface of the floor plate 11 by welding. ing. The intermediate cross beam reinforcing portion 17 may not be provided.

At least one of the front beam reinforcing portion 13 and the rear cross beam reinforcing portion 14 is provided with a cab fastening portion 21 for fastening the bottom portion of the cab 6. In the present embodiment, the rear cross beam reinforcing portions 14 are provided at both left and right ends, respectively. Specifically, the cab fastening portion 21 in the rear cross beam reinforcing portion 14 is located on the front side where the driver's seat installation area S (shown by hatching in FIG. 5) between the front cross beam reinforcing portion 13 and the rear cross beam reinforcing portion 14 is located. It is provided on the extending extension portion 14a. In the driver's seat installation area S, a rectangular driver's seat 50 in a plan view is installed, which is surrounded by the front beam reinforcing portion 13 and the rear cross beam reinforcing portion 14, the left vertical beam reinforcing portion 15, and the right vertical beam reinforcing portion 16. It consists of an area.

In the present embodiment, in the cab 6, in addition to the first bolt insertion hole 6c corresponding to the cab fastening portion 21, a second bolt insertion hole 6d corresponding to the normal mount fastening portion 22 is formed in the lower frame portion 6a. Has been done. As shown in FIG. 4, a mount screw insertion hole 22a for inserting the screw portion 8a of the mount member 8 is also formed on the floor member 10 side in the mount fastening portion 22. Further, the cab body 6b is fixed to the lower frame portion 6a by welding or the like. The first cab fixing bolt 7 is fastened to the first bolt insertion hole 6c. The second cab fixing nut 9 is fastened to the screw portion 8a (shown in FIG. 6) of the mount member 8 inserted into the second bolt insertion hole 6d.

Then, as shown in an enlarged manner in FIG. 3, when viewed from the left and right, the height of the left vertical beam reinforcing portion 15 and the right vertical beam reinforcing portion 16 gradually decreases toward the front side, and the height of the rear side cross beam is gradually reduced. The height of the front cross beam reinforcing portion 13 is configured to be lower than the height of the reinforcing portion 14.

With the above configuration, in the present embodiment, the height of the front side of the left vertical beam reinforcing portion 15 and the right vertical beam reinforcing portion 16 having a relatively small load can be lowered, thereby not only reducing the mass but also painting. The area is reduced, and piping such as hydraulic piping becomes easier. Specifically, as shown in FIGS. 1 and 3, a plurality of piping brackets 18 for inserting and supporting hydraulic pipes and the like are provided in the driver's seat installation area S. Since the front side of the left vertical beam reinforcing portion 15 and the right vertical beam reinforcing portion 16 is lower than the rear side, it is easy to connect these piping brackets 18 to a valve block or the like (not shown) through hydraulic piping.

Further, in the present embodiment, the left vertical beam reinforcing portion 15 and the right vertical beam reinforcing portion 16 are provided on the left and right sides of the pedestal 52 of the driver's seat 50 to which the load is most easily applied in the floor member 10, and the left vertical beam reinforcing portion 15 and the right vertical beam are provided. A front cross beam reinforcing portion 13 and a rear cross beam reinforcing portion 14 are provided at the front and rear ends of the reinforcing portion 16, and the left and right ends of the front cross beam reinforcing portion 13 and the rear cross beam reinforcing portion 14 are extended to the left and right edge portions 12 of the floor plate 11. As a result, the load applied to the driver's seat 50 is transmitted. Moreover, by fastening the rear cross beam reinforcing portion 14 together with the bottom of the cab 6, the load of the driver's seat 50 can be borne by the box structure including the cab 6. Therefore, even if the wall thickness of the floor plate 11 is reduced, the load applied to the driver's seat 50 can be borne by the box structure including the cab 6. Further, since the front beam reinforcing portion 13 and the rear cross beam reinforcing portion 14 are fastened together to the bottom of the cab 6, the bent portion of the left and right edge portions 12 and the front cross beam reinforcing portion 13 and the rear cross beam reinforcing portion 14 are mutually fastened. Rigidity is ensured without welding.

Further, in the present embodiment, the cab fastening portion 21 is provided in the driver's seat installation area S which is reinforced and has high rigidity between the front side beam reinforcing portion 13 and the rear side cross beam reinforcing portion 14, so that the driver's seat installation area S is the cab. It has a box structure with 6 added to improve the rigidity.

Further, in the present embodiment, the front side beam reinforcing portion 13 and the rear side cross beam reinforcing part 14, the left side vertical beam reinforcing part 15 and the right side vertical beam reinforcing part 16 are welded to the floor plate 11 by welding, so that they are pressed or machined. There is no such thing, and the configuration of the floor plate 11 is simplified.

Further, in the present embodiment, the driver's seat 50 is provided in the highly rigid driver's seat installation area S composed of the cab 6 and the floor member 10, so that the work machine 1 with high commercial value is ensured in safety and quietness. Is obtained.

Therefore, according to the floor member 10 of the work machine 1 according to the present embodiment, it is possible to secure the rigidity while reducing unnecessary reinforcement without increasing the thickness of the floor plate 11.

(Other embodiments)
The present invention may have the following configurations with respect to the above embodiment.

That is, in the above embodiment, the front beam reinforcing portion 13 and the rear cross beam reinforcing portion 14, the left vertical beam reinforcing portion 15 and the right vertical beam reinforcing portion 16 are all fixed to the back surface of the floor plate 11 by welding. Bolts may be fastened, or at least a part of them may be formed of ribs integrally formed on the floor plate 11 and projecting to the back surface side. Pressing is required in the press forming configuration, but the machining and welding processes are reduced accordingly.

Further, in the above embodiment, the work machine 1 is a hydraulic excavator, but the work machine is not particularly limited as long as it is a work machine including a cab 6, a driver's seat 50 and a floor member 10.

It should be noted that the above embodiments are essentially preferable examples, and are not intended to limit the scope of the present invention, its applications and uses.

1 Work machine
2 Lower running body
3 Upper swivel body
4 swivel frame
5 attachment
5a bucket
6 cab
6a Lower frame
6b cab body
6c 1st bolt insertion hole
6d 2nd bolt insertion hole
7 1st cab fixing bolt
8 Mount member
9 Nut for fixing the 2nd cab
10 Floor members
11 floor plate
12 Left and right edges
13 Front cross beam reinforcement
14 Rear cross beam reinforcement
14a extension
15 Left vertical beam reinforcement
16 Right vertical beam reinforcement
17 Intermediate cross beam reinforcement
18 Piping bracket
20 pedestal fastening part
20a Seat mounting bolt
21 Cab fastening
22 Mount fastening part
22a mount screw insertion hole
50 Driver's seat
51 Seat body
52 pedestal
52a fixing bracket
S Driver's seat installation area

Claims (5)

In the floor member that constitutes the floor part of the cab fixed on the swivel frame of the work machine
A floor plate with a driver's seat placed in the middle of the front and rear, with the left and right edges bent,
An anterior cross beam reinforcing portion and a rear cross beam reinforcing portion, which are provided on the back surface of the floor plate at intervals in the front-rear direction and extend to the vicinity of the left and right edge portions of the floor plate,
It is provided with a left vertical beam reinforcing portion and a right vertical beam reinforcing portion which are fixed to the back surface of the floor plate at intervals on the left and right, and whose front and rear end portions are connected to the front side beam reinforcing portion and the rear side beam reinforcing portion.
A pedestal fastening portion for fastening the pedestal of the driver's seat is provided directly above the left vertical beam reinforcing portion and the right vertical beam reinforcing portion.
A floor member of a work machine, characterized in that at least one of the front beam reinforcing portion and the rear cross beam reinforcing portion is provided with a cab fastening portion for fastening the bottom portion of the cab. In the floor member of the work machine according to claim 1,
When viewed from the left-right direction, the height of the left vertical beam reinforcing portion and the right vertical beam reinforcing portion gradually decreases toward the front side, and the height of the front cross beam reinforcing portion is lower than the height of the rear cross beam reinforcing portion. Configured to be low in height,
The pedestal fastening portion is a floor member of a work machine provided on the rear side of the left vertical beam reinforcing portion and the right vertical beam reinforcing portion. In the floor member of the work machine according to claim 1 or 2.
An intermediate cross beam reinforcing portion is fixed to the portion of the left vertical beam reinforcing portion and the right vertical beam reinforcing portion where the pedestal fastening portion is provided so as to connect the left vertical beam reinforcing portion and the right vertical beam reinforcing portion. A floor member of a work machine characterized by being. In the floor member of the work machine according to any one of claims 1 to 3.
The cab fastening portion in the front cross beam reinforcing portion and the rear cross beam reinforcing portion is characterized in that it is provided in an extension portion extending toward the driver's seat installation area between the front cross beam reinforcing portion and the rear cross beam reinforcing portion. Floor members of work machines. The floor member of the work machine according to any one of claims 1 to 4,
The driver's seat fixed to the pedestal fastening part and
A work machine including the cab fixed to the cab fastening portion.

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