JP2004345422A - Construction machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a construction machine which encourages taking off of soil and improve reliability by dispersing the load applied to the vehicle body in working, and conduce to improve productivity for manufacturing the vehicle body. <P>SOLUTION: The construction machine is equipped with an upper swiveling body (3) and a lower traveling body (2), and the frame (2F) of the lower traveling body is equipped with a center frame (7) having a mounting ring (7r) swivelably provided with the upper swiveling body (3), a pair of track frames (4, 4) which is disposed outside of the both sides of the center frame (7) and installs a crawler belt (9), and a connection member (8) connecting the center frame (7) with a track frame (4). The joint surface (8b) with the center frame (7) in the connection member (8) and the joint surface (7b) with the connection member (8) in the center frame (7) are formed to be flat shape, and the joint part (7h) in the center frame (7) is formed projecting outward of the mounting ring (7r) in such a way to shorten the distance between the center frame (7) and the track frame (4). <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a construction machine such as a hydraulic shovel, and more particularly, to a structure of a frame of a lower traveling body in a construction machine.
[0002]
[Prior art]
Conventionally, as shown in FIG. 4 which is a side view, a hydraulic excavator 11 includes a lower traveling body 12 for moving and an upper revolving body 13 which is mounted on the upper traveling body 12 and can freely pivot.
[0003]
The lower traveling body 12 has driving wheels 15 and idle wheels 16 mounted on both ends of a track frame 14, respectively, and a crawler belt 17 is wound between the driving wheels 15 and idle wheels 16.
[0004]
The hydraulic excavator 11 drives the engine of the power source, converts the hydraulic pressure into a hydraulic pressure by a hydraulic pump, drives the travel motor to rotate the drive wheels 15, and thereby rotates the crawler belt 17 to travel.
[0005]
As shown in FIG. 5, the frame 12F of the lower traveling body is formed by welding sheet metal covers 21 and 22 to the upper and lower portions of a box-shaped rotating case 20, and forming a U-shaped sheet metal case 23 at both ends thereof. It is fixed by welding, and an upper surface plate 24 is formed on the upper part of the sheet metal case 23. (See Patent Document 1)
[Patent Document 1]
Japanese Patent Application No. 2002-332379 [Problems to be Solved by the Invention]
By the way, the above-mentioned hydraulic excavator 11 performs its work outdoors, so that it travels by rotating and driving the crawler belt 17 on the ground in various states, and the crawler belt 17 causes soil, mud, and the like to jump up. .
[0006]
Here, since the cover 21 and the upper surface plate 24 of the sheet metal disposed near the crawler belt 17 are configured to extend in the horizontal direction as shown in FIG. Are accumulated on the cover 21 and the upper plates 24, 24 and stay there.
[0007]
Therefore, the worker must clean the accumulated soil, mud, and the like, and when the excavator 11 travels while the soil, mud, and the like are piled, it also becomes a running resistance.
[0008]
Therefore, measures such as making a hole in the cover 21 are taken so that the soil on the cover 21 is removed.
[0009]
However, since the cover 21 and the like always have a flat surface portion, it is difficult to solve the problem that the soil is easily placed thereon, and there is a need for those skilled in the art to promote the fall of the soil.
[0010]
The present invention has been made in view of the above circumstances, and in addition to solving the above-described problems, it is possible to improve the reliability by dispersing a load applied to a vehicle body during work, and to improve the productivity of a vehicle body manufacturing. For the purpose of providing.
[0011]
Means for Solving the Problems, Functions and Effects
To achieve the above object, a construction machine according to a first aspect of the present invention includes an upper rotating body and a lower traveling body, and a frame of the lower traveling body includes a mounting ring on which the upper rotating body is pivotably mounted. A construction machine comprising: a center frame having a pair of track frames on which crawler belts are disposed outside of both sides of the center frame, and a connecting member for connecting the center frame and the track frame,
The joint surface of the connecting member with the center frame and the joint surface of the center frame with the connecting member are both formed in a planar shape,
Further, the joint portion in the center frame is characterized in that it is formed so as to protrude outward from the mounting ring so as to shorten the distance between the center frame and the track frame.
[0012]
According to the above configuration, since the joint surface of the connecting member with the center frame and the joint surface of the center frame with the connecting member are both formed in a planar shape, the shape is simplified, and the manufacturing of the connecting member and the center frame is simplified. It will be easier.
[0013]
In addition, since the joining surfaces are both flat, the welding line can be straightened, the welding operation is easy, and the assemblability is good.
[0014]
Therefore, the manufacturing process and the assembling process are simplified, and the productivity can be improved.
[0015]
In addition, since the joint portion in the center frame is formed to protrude outward from the mounting ring, the length of the connecting member can be shortened, and the length of the load moment generated in the connecting member, that is, the length of the connecting member, The length can be shortened, the load moment can be reduced, and the load can be received by the center frame having higher strength.
[0016]
Therefore, the mechanical reliability is improved, and the life of the vehicle body can be extended.
[0017]
The construction machine according to the second aspect of the present invention is the construction machine according to the first aspect,
The joint surface of the connecting member with the center frame is formed so that the axis of the connecting member intersects as an oblique line, so that the joint length with the center frame is increased.
[0018]
According to the above configuration, since the joint surface of the connecting member with the center frame is formed so that the axis of the connecting member intersects as oblique lines, the joint surface is formed as compared with the case where the axis of the connecting member intersects as a vertical line. The joining length can be increased, the length that can be joined by welding is increased, and the joining strength is improved.
[0019]
In addition, since the joining length of the joining surface of the connecting member can be increased, the load per unit joining length on the joining surface of the load transmitted through the connecting member can be reduced.
[0020]
Accordingly, it is possible to improve the joint strength of the joint member at the joint surface with the center frame and reduce the applied load per unit joint length, thereby improving the mechanical reliability and extending the life of the vehicle body.
[0021]
Further, a construction machine according to a third aspect of the present invention is characterized in that, in the second aspect of the invention, a joining surface of the center frame with the connecting member matches a joining surface of the connecting member.
[0022]
According to the above configuration, since the joining surface of the center frame with the connecting member matches the joining surface of the connecting member, the joining length of the joining surface can be increased, and the length that can be joined by welding can be increased. Strength is improved.
[0023]
Further, since the joining length of the joining surface of the center frame with the connecting member can be increased, the load per unit joining length of the joining surface on the joining surface can be reduced.
[0024]
Therefore, it is possible to improve mechanical reliability and extend the life of the vehicle body.
[0025]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the drawings showing examples.
[0026]
As shown in FIG. 1, a hydraulic excavator 1 according to an embodiment is provided with a lower traveling body 2 for moving and an upper revolving body which is mounted on the upper part of the lower traveling body 2 so as to be pivotable and allows a worker to get on and work. 3 is provided.
[0027]
The upper revolving unit 3 is provided with an operation seat 3a on which an operator sits to perform a work, and a hydraulically driven boom 10a, an arm 10b, and a front end of the arm 10b. A work machine 10 having an excavating bucket 10c is pivotally supported in a vertically swingable manner.
[0028]
The lower traveling body 2 has driving wheels 5 and idle wheels 6 mounted on both ends of the track frame 4, respectively, and a crawler belt 9 is wound between the driving wheels 5 and the idle wheels 6.
[0029]
The hydraulic excavator 1 starts the engine of the power source, converts the hydraulic pressure into hydraulic pressure by a hydraulic pump, drives the traveling motor, transmits the power to the driving wheels 5, and rotates the crawler belt 9 by rotating the driving wheels 5. The traveling is performed.
[0030]
As shown in FIG. 2 which is a perspective view and FIG. 3 which is a top view, the frame 2F of the lower traveling structure has a center frame 7 having a mounting ring 7r to which the upper rotating body 3 is attached, which is arranged in the center. Track frames 4, 4 are arranged on both sides thereof, and each track frame 4 is connected to the center frame 7 by two foot-like connecting members 8, 8, respectively.
[0031]
As described above, by connecting each track frame 4 to the center frame 7 by the two connecting members 8, large empty spaces k, k are formed near each track frame 4 as shown in FIG. At this time, soil, mud, and the like, which are sometimes jumped up by the crawler belt 9, pass through the spaces k, k and fall on the ground, so that the falling of the soil is favorably promoted.
[0032]
The track frame 4 has a rectangular cross-section extending in the front-rear direction (the left-right direction in FIGS. 1, 2 and 3), and the upper surface thereof is formed, as shown in FIG. And has an inclined surface plate 4a that forms a one-sided tapered surface descending toward.
[0033]
A ground drop hole 4ah is formed near the center of the inclined face plate 4a of the track frame 4.
[0034]
Due to the structure of the track frame 4, the soil that has been jumped up by the crawler belt 9 during traveling and dropped on the track frame 4 slides down on the inclined face plate 4a and falls, but the inclination of the inclined face plate 4a is directed outward. Since the soil is formed so as to descend, the soil falls to the outside of the vehicle body, and it is unnecessary to clean up the soil.
[0035]
At the same time, the soil dropped on the track frame 4 passes through the soil drop hole 4ah of the inclined face plate 4a and falls on the ground.
[0036]
The upper surface of the track frame 4 may be a double tapered surface instead of a single tapered surface.
[0037]
The connecting member 8 is made of a wax casting, and is formed to have a substantially rhombic cross-sectional shape.
[0038]
In the present embodiment, the connecting member 8 is manufactured by casting, but the connecting member 8 is not limited to casting and can be manufactured by sheet metal.
[0039]
Since the connecting member 8 is formed to have a substantially rhombic cross-sectional shape, the soil jumped up by the crawler belt 9 during traveling slides on the inclined surface of the upper surface of the connecting member 8 and falls on the ground, and falls on the connecting member 8. Loading is prevented.
[0040]
As shown in FIG. 3, the center frame 7 is joined to the connecting members 8 by welding the joining surfaces 7 b to the joining surfaces 8 b of the connecting members 8. Similarly, the track frame 4 is The joining surface 4b is joined to the joining surface 8b of each connecting member 8 by welding to join the joining surface 8b.
[0041]
Here, as shown in FIGS. 2 and 3, the joint surface 7b of the center frame 7 is not formed continuously outside the attachment ring 7r, but is formed by joining the joint portion 7h so as to project from the attachment ring 7r. It is formed in a planar shape on the outer edge of the joint 7h so as to be linear in a top view.
[0042]
The joining surface 8b of the connecting member 8 joined to the joining surface 7b of the center frame 7 having such a shape is configured in a manner to match the joining surface 7b, and is similarly formed in a planar shape that is linear in a top view. Have been.
[0043]
Further, as shown in FIG. 3, the joining surface 8b of the connecting member 8 is not perpendicular to an axis (straight lines A and B in FIG. 3) along the direction in which the connecting member 8 extends. It is formed as a plane having a certain angle (α °, β ° in FIG. 3) with respect to it.
[0044]
That is, the joint surface 8b of the connecting member 8 with the center frame 7 is formed so that the axis of the connecting member 8 intersects as an oblique line (a straight line that is neither vertical nor parallel), and the joint length with the center frame (7) is long. It is constituted so that it may become.
[0045]
As described above, by increasing the joining length of the joining surface 8b of the connecting member 8 with the center frame (7), the welding length of the joining portion with the center frame (7) is increased, and the strength of the joining portion is improved. In addition, the load applied to the joint can be dispersed.
[0046]
As shown in FIG. 3, the track frame 4 on one side and the pair of connecting members 8 are positioned on the center plane in the width direction of the center frame 7 with respect to the track frame 4 on the other side and the pair of connecting members 8. 3 (center line in the up-down direction).
[0047]
According to the above configuration, since the joint surface 7b of the center frame 7 and the joint surface 8b of the connecting member 8 are formed in a planar shape, the shapes are simplified, and the manufacture of the center frame 7 and the connecting member 8 becomes easy. , Increasing productivity.
[0048]
In addition, since the joint surface 7b of the center frame 7 and the joint surface 8b of the connecting member 8 have a planar shape, the welding line can be made straight, welding work is easy, and assemblability is improved.
[0049]
In addition, since the hydraulic excavator 1 travels on the ground having various irregularities, various loads are applied to the track frame 4 on which the crawler belts 9 that are driven to rotate on the ground are installed. These various loads are transmitted to the connecting member 8 to be joined.
[0050]
However, the joint surface 8b, which is the joint portion of the connecting member 8 with the center frame 7, is formed so that the axes (the lines A and B in FIG. 3) of the connecting member 8 intersect as oblique lines. As compared with the case where the cross is formed, the joining length with the center frame 7 can be made longer.
[0051]
Therefore, the load per unit joining length at the joining portion of the above load transmitted and transmitted through the connecting member 8 is reduced, and the load applied to the joining surface 8b of the connecting member 8 and the joining surface 7b of the center frame 7 is dispersed. .
[0052]
In addition, since the joining length can be increased, the welding length at the joining portion can be sufficiently ensured, and the joining strength can be improved.
[0053]
Therefore, the load per unit joining length between the joining surface 8b of the connecting member 8 and the joining surface 7b of the center frame 7 is reduced, and a sufficient welding length is secured and the joining strength is improved. The reliability is improved, the wear of the vehicle body is prevented, and the life is extended.
[0054]
In addition, since the joint surface 7b of the center frame 7, which is the joint portion with the connecting member 8, is formed at the joint portion 7h that protrudes outward from the mounting ring 7r, the connecting member through which the load applied to the crawler belt 9 is propagated. 8 can be shortened.
[0055]
Therefore, the moment generated by the load from the crawler belt 9 applied to the connecting member 8 from the track frame 4 can shorten the length of the crest, that is, the length of the connecting member 8, so that the moment due to the load is reduced, and the load is reduced. Can be received by the center frame 7 having higher strength.
[0056]
Therefore, the mechanical reliability is further improved, and the wear of the vehicle body is prevented.
[0057]
In the present embodiment, the joining surface 7b of the center frame 7 and the joining surface 8b of the connecting member 8 are formed as vertical surfaces. Never.
[0058]
In the above-described embodiment, the hydraulic shovel is illustrated as the construction machine. However, it goes without saying that the hydraulic machine according to the present invention can be effectively applied to other construction machines other than the hydraulic shovel having a similar configuration.
[Brief description of the drawings]
FIG. 1 is a side view showing a hydraulic excavator according to an embodiment of the present invention.
FIG. 2 is a perspective view of a frame of a lower traveling body in the hydraulic excavator shown in FIG.
FIG. 3 is a top view of a frame of a lower traveling body in the hydraulic excavator shown in FIG. 1;
FIG. 4 is a side view showing a conventional hydraulic excavator.
FIG. 5 is a perspective view of a frame of a lower traveling body in a conventional hydraulic shovel.
[Explanation of symbols]
1. Hydraulic excavator (construction equipment),
2. Lower traveling body,
2F: frame of the lower traveling body,
3: Upper revolving superstructure,
4: Track frame,
7 ... Center frame,
7b: joining surface of the center frame,
7h: Joint of the center frame,
7r ... mounting ring,
8 ... connecting member,
8b: joining surface of connecting member,
9 ... Track,
A, B ... axis.

Claims (3)

A frame (2F) of the lower traveling structure includes an upper rotating body (3) and a lower traveling body (2), and has a mounting frame (7r) to which the upper rotating body (3) is pivotably attached. (7), a pair of track frames (4, 4) arranged on both sides of the center frame (7) outside and on which the crawler belt (9) is installed, and the center frame (7) and the track frame (4). A construction machine (1) comprising a connecting member (8) for connecting;
The joint surface (8b) of the connecting member (8) with the center frame (7) and the joint surface (7b) of the center frame (7) with the connecting member (8) are both formed in a planar shape,
The joint (7h) of the center frame (7) is formed so as to protrude outward from the mounting ring (7r) so as to shorten the distance between the center frame (7) and the track frame (4). And construction machinery. The joining surface (8b) of the connecting member (8) with the center frame (7) is formed such that the axes (A, B) of the connecting member (8) intersect as oblique lines, and the joining length with the center frame (7). The construction machine according to claim 1, wherein the construction machine is configured to be longer. The construction machine according to claim 2, wherein a joint surface (7b) of the center frame (7) with the connecting member (8) matches a joint surface (8b) of the connecting member (8). .

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