JP2009035194A - Main frame for construction machine, and construction machine provided with this - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a main frame for a construction machine also responding to increase in cab size while ensuring sufficient strength, and a construction machine provided with this. <P>SOLUTION: The main frame 40 of the bulldozer 10 constitutes a skeleton portion of the bulldozer 10, and is provided with a hull frame 41 having a ship bottom shape; a pair of left and right fender frames 42a, 42b mounted to both side surfaces of the hull frame 41 respectively; and extension parts 51, 51b casting-integration-molded so as to be extended in a width direction at upper parts of the fender frames 42a, 42b. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a main frame of a construction machine such as a bulldozer and a construction machine provided with the same.

In recent years, construction machines such as bulldozers are configured such that each member such as a radiator guard, a truck frame, a fender, and a cab is mounted on a ship-bottomed main frame.
For example, Patent Document 1 discloses a main frame structure of a construction machine in which a main frame configured by combining a plurality of frame modules is formed by casting and integrating a frame module at a portion that receives a load.
WO2005 / 073473 (Internationally released on August 11, 2005)

However, the structure of the main frame of the conventional construction machine has the following problems.
That is, in the main frame of the construction machine disclosed in the above-mentioned publication, sufficient strength as the main frame is obtained by integrally molding a part where stress is easily concentrated by an external force applied from the work machine or the work machine drive cylinder. Secured. However, with such a mainframe configuration, it is difficult to say that it is possible to appropriately respond to the recent increase in the size of the cab in consideration of operator comfort and the like.

In particular, as the cab becomes larger, there is a problem that the shape of a member such as a ROPS bracket that supports the four corners of the cab becomes complicated so that it can be supported outside the main frame.
An object of the present invention is to provide a main frame of a construction machine that can cope with an increase in the size of a cab while securing a sufficient strength, and a construction machine including the main frame.

  A main frame of a construction machine according to a first invention is a main frame constituting a skeleton part of the construction machine, and includes a first frame, a second frame, and an extending portion. The first frame is disposed in the central portion of the construction machine and has a ship bottom shape. The second frame is disposed on each of the left and right sides of the first frame, and constitutes a side surface to which the traveling device for the construction machine is attached. The extending portion is integrally formed with the second frame so as to extend in the width direction at a portion corresponding to the fender portion of the construction machine.

Here, for example, an extension portion that is attached to the left and right side surfaces of the hull frame (first frame) of the ship bottom and that extends in the width direction on the fender portion of the upper portion of the second frame that supports the traveling device or the like is provided in the second direction. It is integrally formed when casting the frame.
Here, the said extending | stretching part is extended | stretched so that the upper part of a 2nd frame may protrude right and left in the width direction of a construction machine (main frame). The extending portion is required to have a sufficient strength as compared with other components in the main frame as a base for supporting the cab on which the operator of the construction machine gets on and off from below. In addition, the second frame forms the left and right side surfaces of the main frame and, for example, is attached as a heavy product such as a pivot shaft connected to a track frame or the like. It is superior in strength compared to the part. In addition, the said width direction shall mean the width direction of the vehicle body orthogonal to the advancing direction of a construction machine.

  As a result, the main frame part for supporting heavy objects such as cabs is formed by integrally forming the extension part extending in the width direction above the second frame, which is excellent in strength, with the second frame as a casting. Can spread in the direction. As a result, it is possible to cope with the recent increase in the size of the cab without increasing the size of the entire main frame, and it is possible to easily provide a stretched portion excellent in strength.

The main frame of the construction machine according to the second invention is the main frame of the construction machine according to the first invention, and the extending portion has a substantially horizontal placement surface.
Here, the extending | stretching part shape | molded by the casting integration mentioned above has a substantially horizontal mounting surface for supporting each component mounted on a main frame.
This simplifies the shape of heavy objects such as ROPS (Rollover Protective Structure) brackets that are placed on the extension, and supports these heavy objects stably. can do.

The main frame of the construction machine according to the third invention is the main frame of the construction machine according to the first or second invention, and the extending portion supports the fuel tank of the construction machine and the four corners of the cab of the construction machine. At least a ROPS bracket is arranged.
Here, the parts that are relatively heavy among the parts arranged on the main frame, such as the ROPS bracket that supports the fuel tank and cab of the construction machine from the lower side, on the above-described casting integrally formed extension part Is provided.
Thereby, a weight part can be appropriately arrange | positioned to a part with high intensity | strength by mounting a heavy article on the extending | stretching part which was integrated with casting with respect to the flame | frame, and was excellent in intensity | strength.

  A main frame of a construction machine according to a fourth invention is the main frame of the construction machine according to any one of the first to third inventions, further comprising a sheet metal part attached to the outside in the width direction in the extending part. I have.

Here, the sheet metal part is provided on the outer side in the width direction of the extending part on which the above-described relatively heavy component is placed.
Thereby, what is mounted outside the cab of the construction machine, such as a hydraulic oil tank, can be supported by the sheet metal part. As a result, by using a sheet metal part for the part that does not take much weight outside the stretched part, the size of the stretched part that is an integral part of the casting is minimized, and the enlargement of the frame formwork is avoided. Can do.

The main frame of the construction machine according to the fifth invention is the main frame of the construction machine according to the fourth invention, and at least a hydraulic oil tank and a battery are disposed on the upper surface of the sheet metal part.
Here, among the components placed on the main frame, relatively lightweight components such as a hydraulic oil tank and a battery are arranged on a sheet metal portion attached to the outside of the extending portion.
As a result, heavy objects such as fuel tanks and ROPS brackets can be appropriately placed on the extension part integrally formed with the casting, and a hydraulic oil tank or battery lighter than that can be appropriately placed on the sheet metal part. it can.

A main frame of a construction machine according to a sixth invention is the main frame of the construction machine according to any one of the first to fifth inventions, wherein four corners of the cab of the construction machine are formed on the upper surface of the extending portion. While supporting, a substantially quadrangular prism-shaped ROPS bracket is arranged.
Here, ROPS (Rollover Protective Structure) brackets that support the four corners of the cab from below are arranged on the upper surface of the extending portion formed so as to extend in the width direction of the main frame.
Thereby, compared with the structure of the ROPS bracket having a complicated structure attached to the conventional main frame having no extending portion, it is only necessary to place the substantially quadrangular prism ROPS bracket on the upper surface of the extending portion extending in the width direction. . As a result, the structure of the ROPS bracket can be simplified as a substantially quadrangular prism.

A main frame of a construction machine according to a seventh aspect is the main frame of the construction machine according to any one of the first to sixth aspects, wherein the second frame supports at least the pivot shaft.
Here, the second frame that supports the pivot shaft or the like is specified as the portion where the extending portion is formed in the main frame.

  Thereby, a heavy load such as a pivot shaft can be supported under the extended portion while supporting a large load such as a cab or a fuel tank from above. That is, in order to support the pivot shaft or the like, an extending portion is originally provided on the upper portion of the robust second frame. As a result, by providing the extension part in a part of the second frame that is originally excellent in strength, the strength of the extension part can be sufficiently secured easily.

A construction machine according to an eighth aspect includes the main frame of the construction machine according to any one of the first to seventh aspects.
Accordingly, as described above, it is possible to obtain the same effect as described above, in which a frame structure that can cope with an increase in the size of the cab can be configured while securing a sufficient strength in the main frame.

  According to the main frame of the construction machine according to the present invention, it is possible to cope with an increase in the size of the cab while ensuring sufficient strength.

A bulldozer (construction machine) 10 equipped with a main frame of a construction machine according to an embodiment of the present invention will be described as follows with reference to FIGS. In addition, regarding “front”, “rear”, and “width direction” used in the following description, the forward side of the bulldozer 10 is “front”, the rear side is “rear”, and the direction orthogonal to the front-rear direction is “width direction” ".
[Overall configuration of bulldozer 10]
1 to 3, the bulldozer 10 of the present embodiment includes a cab 11, a front exterior 12, left and right traveling devices 13, 14, a fuel tank 15, a hydraulic oil tank 16, a working device 20, a battery 30 (see FIG. 8) and a main frame 40 (see FIG. 4).

The cab 11 is equipped with a seat for an operator of the bulldozer 10 and levers, pedals, and instruments for various operations. The cab 11 has a fall-over driver protection structure (hereinafter referred to as a ROPS structure), and is disposed on the rear side of a main frame 40 (see FIG. 4) described later.
The front exterior 12 houses the engine and is attached to the front of the cab 11. And the front exterior 12 has opened only the hole which the inlet port and exhaust pipe of an air cleaner of an engine penetrate, and forms the sealing structure.

Further, an exhaust pipe 12a is attached to the front exterior 12 so as to extend upward from the upper surface thereof. The exhaust pipe 12 a is erected at a position overlapping the pillars constituting the cab 11 when viewed from the operator in the cab 11. As a result, the exhaust pipe 12a prevents the forward visibility from the operator in the cab 11 from being lowered.
The travel devices 13 and 14 are attached to the left and right sides of a main frame 40 (see FIG. 4), which will be described later, and are formed endlessly by connecting a plurality of plate-like shoes and wound around a plurality of upper and lower wheels. The crawler belts 13a and 14a are rotated to enable traveling on rough terrain.

The fuel tank 15 is a tank that stores fuel supplied to the engine mounted inside the front exterior 12 inside the cover, and is attached to the rear of the cab 11.
The hydraulic oil tank 16 is a tank that stores working oil supplied to the transmission system and the work machine system, and is attached to the right rear of the cab 11.

The working device 20 includes a blade 21 and a hydraulic cylinder 22, and the blade 21 is tilted or moved in a desired direction as the hydraulic cylinder 22 expands and contracts.
The battery 30 is mounted on a sheet metal member 44a included in a main frame 40 described later in order to supply electric power necessary for starting the engine to a cell motor or the like (see FIG. 8).

The main frame 40 is a member that serves as a base for forming the skeleton of the bulldozer 10, and includes a work device 20 on the front, travel devices 13 and 14 on the left and right sides, a front exterior 12 on the top, a cab 11, a fuel tank 15, and hydraulic oil. A tank 16, a battery 30 and the like are mounted. The frame structure of the bulldozer 10 including the main frame 40 will be described in detail later.
[Frame structure of bulldozer 10]
As shown in FIG. 4, the bulldozer 10 of the present embodiment has a front exterior 12, a pair of left and right truck frames (not shown), a fuel tank 15, a hydraulic oil tank 16, and a cab 11 attached to a main frame 40. . The track frames are not shown in FIG. 4 for convenience of explanation, but a pair of left and right track frames are provided with the main frame 40 interposed therebetween.

(Main frame 40)
As shown in FIG. 4, the main frame 40 is a ship-bottom-shaped frame disposed at the center of the bulldozer 10 and has an engine mounted on the front thereof. The main frame 40 has pivot shafts 31 at both left and right ends, and left and right track frames are attached to the pivot shaft 31.

Further, as shown in FIGS. 5 and 6, the main frame 40 includes a hull frame (first frame) 41, fender frames (second frames) 42a and 42b, ROPS brackets 43a and 43b, a cab, 11 are provided with mount portions 43c and 43d that support the two front corners of the 11 and sheet metal members (sheet metal portions) 44a and 44b.
As shown in FIGS. 6 and 7, the hull frame 41 is a frame having a substantially U-shaped cross section, and forms the ship bottom shape of the main frame 40. Further, the hull frame 41 is disposed at the center portion of the main frame 40 (bulldozer 10) so as to be sandwiched between the left and right fender frames 42a and 42b.

  The fender frames 42 a and 42 b are attached to both the left and right sides of the hull frame 41 and constitute the side surface of the main frame 40. As shown in FIG. 4, the left and right pivot shafts 31 that connect the left and right track frames are respectively attached to the fender frames 42 a and 42 b on the surface that is the side surface of the main frame 40. Further, as shown in FIGS. 7 and 8, the fender frames 42a and 42b have extending portions 51a and 51b extending in the width direction at the upper portion thereof.

  The extending portions 51a and 51b are formed as a part of the fender frames 42a and 42b by integral casting. The extending portions 51a and 51b support heavy components such as the ROPS brackets 43a and 43b and the fuel tank 15 on the substantially horizontal upper surface (mounting surface) (see FIGS. 7 and 8). ing. Furthermore, sheet metal members 44a and 44b made of sheet metal are attached to the outer sides in the width direction of the extending portions 51a and 51b. The sheet metal members 44a and 44b will be described in detail later.

  The ROPS brackets 43a and 43b are components placed on the main frame 40 in order to support the rear two corners of the cab 11, and have a substantially quadrangular prism shape. That is, as shown in FIGS. 5 and 6, the ROPS brackets 43a and 43b are placed on the mounting surfaces of the extending portions 51a and 51b formed by casting integrated molding on the upper portions of the fender frames 42a and 42b. Fixed by welding.

The mount portions 43c and 43d are cab damper mounts on which two front corners of the cab 11 are placed, and are attached with vibration-proof mounts. For this reason, the shock applied to the traveling devices 13 and 14 during traveling of the bulldozer 10 is buffered, and the transmission of vibration to the operator in the cab 11 is reduced.
The sheet metal members 44a and 44b are members configured by combining a plurality of sheet materials formed by sheet metal processing, and are formed on the outer sides in the width direction of the extending portions 51a and 51b formed on the upper portions of the above-described fender frames 42a and 42b. Each is fixed by welding. That is, in the fender frames 42a and 42b, a casting is integrally formed from the lower end portion to the extending portions 51a and 51b, and only the sheet metal members 44a and 44b ahead are attached by welding.

[Features of the main frame 40 of the bulldozer 10]
(1)
The main frame 40 of the bulldozer 10 according to the present embodiment constitutes a skeleton part of the bulldozer 10, and as shown in FIGS. 6 to 8, a hull frame 41 having a ship bottom shape, and both side surfaces of the hull frame 41, respectively. A pair of left and right fender frames 42a and 42b to be attached, and extending portions 51a and 51b integrally formed by casting so as to extend in the width direction at the upper portions of the fender frames 42a and 42b are provided.

  Thereby, the extending portions 51a and 51b excellent in strength by integral casting can be provided on the upper portions of the fender frames 42a and 42b so as to spread in the width direction. As a result, even if the cab 11 of the bulldozer 10 is required to be enlarged, the enlarged cab can be obtained by forming the extending portions 51a and 51b without increasing the lateral distance between the outer surfaces of the fender frame. 11 can be supported.

In addition, since the casting is integrally formed as a part of the fender frames 42a and 42b having excellent strength, the supporting strength in the extending portions 51a and 51b can be greatly improved as compared with the conventional main frame structure. . As a result, heavy objects such as the enlarged cab 11 and fuel tank 15 can be stably supported.
(2)
In the main frame 40 of the bulldozer 10 of the present embodiment, as shown in FIGS. 7 and 8, the extending portions 51 a and 51 b formed on the upper portions of the fender frames 42 a and 42 b have a mounting surface substantially in the horizontal direction. Have.

Accordingly, heavy objects such as the ROPS brackets 43a and 43b and the fuel tank 15 that support the cab 11 can be stably supported. Moreover, since it is only necessary to place heavy objects such as the ROPS brackets 43a and 43b on the substantially horizontal mounting surface, the structure on the heavy object side can be simplified.
(3)
In the main frame 40 of the bulldozer 10 of the present embodiment, as shown in FIGS. 7 and 8, the fuel tank 15 and the cab 11 are supported on the extending portions 51a and 51b formed on the upper portions of the fender frames 42a and 42b. The ROPS brackets 43a and 43b are fixed by welding or the like.

Thereby, among the components placed on the main frame 40, the fuel tank 15 and the ROPS brackets 43a, 43b, etc., which are relatively heavy are selectively placed on the extending portions 51a, 51b which are excellent in strength. Thereby, the mounted object of the main frame 40 can be arrange | positioned appropriately.
(4)
In the main frame 40 of the bulldozer 10 of the present embodiment, as shown in FIG. 6 and the like, the sheet metal members 44a and 44b are welded to the outside in the width direction of the extending portions 51a and 51b formed on the upper portions of the fender frames 42a and 42b. It is attached by.

  Thereby, the breadth of the width direction in the upper part of the fender frames 42a and 42b can be further provided. A relatively lightweight object can be placed on the sheet metal members 44a and 44b by selectively placing heavy objects such as the ROPS brackets 43a and 43b on the extending portions 51a and 51b. Further, with respect to the fender frames 42a and 42b and the extending portions 51a and 51b formed by casting integrated molding, the size of the molding die can be minimized and an increase in manufacturing cost can be suppressed.

(5)
In the main frame 40 of the bulldozer 10 of the present embodiment, as shown in FIG. 8, on the sheet metal members 44a and 44b attached to the outer sides in the width direction of the extending portions 51a and 51b formed on the upper portions of the fender frames 42a and 42b. The hydraulic oil tank 16 and the battery 30 are placed.

Thereby, heavy objects such as ROPS brackets 43a and 43b are on the extension parts 51a and 51b having excellent strength, and lightweight objects such as the hydraulic oil tank 16 and the battery 30 are on the sheet metal members 44a and 44b having inferior strength. Thus, the components placed on the main frame 40 can be optimally arranged in consideration of the strength side on the support side.
(6)
In the main frame 40 of the bulldozer 10 of this embodiment, as shown in FIGS. 6 and 7, ROPS brackets 43a, which are fixed to the extending portions 51a, 51b formed on the upper portions of the fender frames 42a, 42b by welding or the like. 43b is formed to have a substantially quadrangular prism shape.

Thus, by extending the extending portions 51a and 51b in the width direction and securing the mounting surface, the device on the shape surface such as extending the ROPS brackets 43a and 43b supporting the enlarged cab 11 in the width direction. Is no longer necessary. As a result, the shape and attachment work of the ROPS brackets 43a and 43b can be simplified.
(7)
In the main frame 40 of the bulldozer 10 of the present embodiment, as shown in FIG. 4, pivot shafts 31 are attached to the outer surfaces of the fender frames 42a and 42b, respectively.

  As a result, in order to support the pivot shaft 31 and the like, the extending portions 51a and 51b can be provided on the upper portions of the fender frames 42a and 42b formed in an excellent strength state by integral casting. As a result, heavy objects such as the ROPS brackets 43a and 43b and the fuel tank 15 can be selectively disposed on the upper portions of the fender frames 42a and 42b having excellent strength.

(8)
As shown in FIGS. 1 to 4, the bulldozer 10 of the present embodiment includes the main frame 40 described above.
As a result, the fuel tank 15, hydraulic oil tank 16, battery 30, ROPS brackets 43a, 43b, etc. arranged on the main frame 40 are selectively selected from those having a large weight, and the fender frames 42a, 42b having excellent strength. It can arrange | position on upper extending part 51a, 51b. As a result, a heavy object can be stably supported while maintaining a strength balance on the main frame 40.

[Other Embodiments]
As mentioned above, although one Embodiment of this invention was described, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the summary of invention.
(A)
In the said embodiment, the sheet metal members 44a and 44b were attached and demonstrated to the width direction outer side of the extending | stretching parts 51a and 51b formed in the upper part of the fender frames 42a and 42b, respectively. However, the present invention is not limited to this.

For example, the sheet metal member may be reduced by extending the extending portion to the sheet metal member. In this case, it is possible to place a larger amount of heavy material on the stretched portion formed by integral casting and having excellent strength.
However, considering the aspect that the mold used for casting molding becomes larger by extending the stretched portion, as in the above embodiment, the stretched portion is stretched only as much as necessary to support heavy objects. More preferably, the extending portion is provided on the upper portion of the fender frame.

(B)
In the above embodiment, the configuration in which the pivot shaft 31 is supported in the fender frames 42a and 42b has been described as an example. However, the present invention is not limited to this.
For example, the fender frame may be configured to support a final drive in addition to the pivot shaft.

(C)
In the embodiment described above, only the fuel tank 15 and the ROPS brackets 43a and 43b have been described as examples of heavy objects placed on the extending portions 51a and 51b formed on the upper portions of the fender frames 42a and 42b. However, the present invention is not limited to this.
For example, among the components placed on the main frame 40, other components having a relatively large weight may be arranged on the extending portion.

(D)
In the above embodiment, only the hydraulic oil tank 16 and the battery 30 are mounted as components mounted on the sheet metal members 44a and 44b attached to the outside of the extending portions 51a and 51b formed on the upper portions of the fender frames 42a and 42b. It was explained as an example. However, the present invention is not limited to this.

For example, among the parts placed on the main frame 40, other parts having a relatively small weight may be arranged on the sheet metal member.
(E)
In the above embodiment, the bulldozer 10 has been described as an example of the construction machine on which the main frame 40 according to the present invention is mounted. However, the present invention is not limited to this.

  For example, the present invention can be applied to a main frame of another construction machine such as a wheel loader.

  The main frame of the construction machine of the present invention has the effect of being able to cope with an increase in the size of the cab while ensuring sufficient strength, and is therefore widely applicable to various construction machines equipped with a cab. .

The front perspective view of the bulldozer which concerns on one Embodiment of this invention. The side view of the bulldozer shown in FIG. The rear perspective view of the bulldozer of FIG. The perspective exploded view which shows the frame structure with which the bulldozer of FIG. 1 is provided. The perspective view which shows the structure of the main frame periphery contained in the frame structure of FIG. FIG. 6 is an exploded perspective view showing a configuration of a frame that constitutes a rear portion of the main frame of FIG. The schematic diagram which shows the positional relationship of the ROPS bracket mounted on the main frame of FIG. FIG. 6 is a schematic diagram showing a positional relationship between a fuel tank, a hydraulic oil tank, a battery, and the like placed on the main frame in FIG. 5.

Explanation of symbols

10 Bulldozer (construction machine)
11 Cab 12 Front exterior 12a Exhaust pipes 13 and 14 Traveling devices 13a and 14a Track 15 Fuel tank 16 Hydraulic oil tank 20 Working device 21 Blade 22 Hydraulic cylinder 30 Battery 31 Pivot shaft 40 Main frame 41 Hull frame (first frame)
42a, 42b Fender frame (second frame)
43a, 43b ROPS brackets 43c, 43d Mount portions 44a, 44b Sheet metal member (sheet metal portion)
51a, 51b Extension part

Claims (8)

A main frame that constitutes a skeleton part of a construction machine,
A first frame disposed in a central portion of the construction machine and having a bottom shape;
A second frame that is disposed on each of the left and right sides of the first frame, and that forms a side surface to which the traveling device of the construction machine is attached;
An extension portion integrally molded with the second frame so as to extend in the width direction at a portion corresponding to the fender portion of the construction machine;
Main frame of construction machinery equipped with. The extending portion has a substantially horizontal placement surface,
The main frame of the construction machine according to claim 1. In the extending portion, at least ROPS brackets supporting the fuel tank of the construction machine and the four corners of the cab of the construction machine are arranged.
The main frame of the construction machine according to claim 1 or 2. A sheet metal part attached to the outer side in the width direction of the extending part;
The main frame of the construction machine according to any one of claims 1 to 3. At least the hydraulic oil tank and the battery are disposed on the upper surface of the sheet metal part.
The main frame of the construction machine according to claim 4. While supporting the four corners of the cab of the construction machine on the upper surface of the extending portion, a substantially quadrangular prism-shaped ROPS bracket is disposed, respectively.
The main frame of the construction machine according to any one of claims 1 to 5. The second frame supports at least a pivot shaft;
The main frame of the construction machine according to any one of claims 1 to 6. The main frame of the construction machine according to any one of claims 1 to 7,
Construction machinery.

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