JP2005188025A - Cover member in construction machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To form a bolt insert part in one stroke continued with laser cutting forming the outer peripheral edge of a cover member and easily attach and detach the cover member to form the bolt insert part for inserting, therein, a bolt for fixing the cover member in the cover member covering an opening formed in a construction machine. <P>SOLUTION: One of the bolt insert parts formed in the cover plate 11 is used as a circular bolt insert hole 13 communicating with the outer peripheral edge part of a cover plate 11 through a thin groove 13a smaller in width than the diameter of a bolt shaft. The other bolt insert parts are used as U-shaped bolt insert grooves 14 larger in width than the diameter of the bolt shaft and to which the outer peripheral edge part side of the cover plate 11 is opened. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention belongs to the technical field of cover members in construction machines such as hydraulic excavators.

In general, a construction machine such as a hydraulic excavator is provided with various openings such as a maintenance opening and a cover member for covering the opening. There is a maintenance opening formed in the lower surface of the traveling body frame of the supporting lower traveling body. The maintenance opening can be used for maintenance such as inspection and repair of the slewing bearing and the like from the opening, and is configured to cover the opening with a cover plate at times other than maintenance work ( For example, see Patent Document 1.) The cover plate is pivotally supported via a shaft in Patent Document 1, but is generally detachably attached to the lower surface of the traveling body frame via a bolt.
Japanese Patent Laid-Open No. 10-18348

By the way, the cover plate is provided with a bolt insertion portion through which a bolt for fixing the cover plate to the lower surface of the traveling body frame is inserted. The bolt insertion portion has a groove width larger than the bolt shaft diameter. If the U-shaped bolt insertion groove is wide and the outer edge side of the cover plate is open, it is easy to align the nut and bolt insertion groove fixed to the lower surface of the traveling body frame, as well as laser cutting and gas cutting. When the cover plate is formed using a cutting means such as the above, the outer peripheral edge of the cover plate and the inner peripheral edge of the U-groove-shaped bolt insertion groove can be continuously cut. The bolt insertion groove can be formed at the same time by the cutting of the stroke, and the productivity is improved.
However, if all the bolt insertion parts of the cover plate are U-shaped insertion grooves, when the removed cover plate is attached to the lower surface of the traveling body frame, the bolts will come out of the insertion groove unless they are bolted at least two places. The cover plate may fall. For this reason, before bolting two or more places, the operator must support the cover plate, and the workability of the mounting work is deteriorated. In addition, when the cover plate is transported to be painted or the like in the manufacturing process of the cover plate, the bolt insertion hole can be used as a suspension hole if it is a circular bolt insertion hole. If the insertion portion is a U-shaped insertion groove, it cannot be used as a suspension hole.
Therefore, it is proposed that at least one bolt insertion portion is not a U-shaped insertion groove but a circular (round or oval) insertion hole. However, the formation of this circular bolt insertion hole is a one-step cutting operation that is continuous with the cutting of the outer peripheral edge of the cover plate when the cover plate is formed using the cutting means such as laser cutting and gas cutting described above. Therefore, there is a problem that the improvement of productivity is hindered, and there is a problem to be solved by the present invention.

The present invention has been created in order to solve these problems in view of the above circumstances, and the invention of claim 1 is directed to a cover member that covers an opening provided in a construction machine. In forming a bolt insertion hole through which a bolt for fixing the member is inserted, the bolt insertion hole is formed to communicate with the outer peripheral edge of the cover member through a narrow groove having a groove width narrower than the bolt shaft diameter. It is characterized by that.
When the bolt insertion hole according to claim 1 is formed using a cutting means such as laser cutting or gas cutting, the cutting locus of the cutting means is changed from the outer peripheral edge of the cover member to the narrow groove. It is characterized by being formed continuously so as to reach the outer peripheral edge of the cover member via the one side groove edge, the inner peripheral edge of the bolt insertion hole, and the other side groove edge of the narrow groove.
The invention of claim 3 is characterized in that the bolt insertion hole of claim 1 or 2 can be used as a suspension hole for suspending the cover member.
According to a fourth aspect of the present invention, a plurality of bolt insertion portions into which bolts for fixing the cover member are inserted are formed in a cover member that covers an opening provided in the construction machine. At least one of them is a circular bolt insertion hole communicating with the outer peripheral edge of the cover member through a narrow groove having a groove width narrower than the bolt shaft diameter, while the other bolt insertion portion has a groove smaller than the bolt shaft diameter. A U-shaped bolt insertion groove having a wide width and an opening on the outer peripheral edge side of the cover member is used.
According to a fifth aspect of the present invention, in any one of the first, second, third, and fourth aspects, the cover member is a cover plate that covers an opening formed in the lower surface of the traveling body frame of the construction machine. It is what.

When the cover member is formed by using a cutting means such as laser cutting or gas cutting, the bolt insertion hole can be formed by cutting in one step continuous with the cutting of the outer peripheral edge of the cover member. Since it can be formed, it is excellent in manufacturability.
By setting it as invention of Claim 2, a bolt penetration hole can be cut | disconnected in the state which continues from the cutting | disconnection of the outer periphery of a cover member.
According to the invention of claim 3, the cover member can be hung using the bolt insertion hole, which is convenient when necessary movement and transportation are performed when the cover member is painted.
According to the invention of claim 4, when the cover member can be easily attached and detached, and when the cover member is formed using a cutting means such as laser cutting or gas cutting, the outer peripheral edge of the cover member Thus, the bolt insertion hole and the bolt insertion groove can be formed by cutting in one step which is continuous with the cutting, and the productivity is excellent.
By setting it as invention of Claim 5, this invention is applicable to the cover board for covering the opening opened in the lower surface of the traveling body frame of a construction machine.

  Next, embodiments of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes a hydraulic excavator. The hydraulic excavator 1 includes a crawler-type lower traveling body 2 and an upper revolving body 4 supported above the lower traveling body 2 through a swivel bearing 3 so as to be rotatable. The basic configuration such as the construction of the working unit 5 and the like mounted on the front part of the upper swing body 4 is the same as conventional ones.

  Reference numeral 6 denotes a traveling body frame that constitutes the lower traveling body 2, and the traveling body frame 6 connects the left and right side frames 8 to which the crawlers 7 are mounted and the left and right side frames 8 to each other and a slewing bearing. 3 is connected to a lower surface of the base frame 9 with a swing bearing 3 and a center joint (not shown) (a hydraulic device on the upper swing body 4 side and a hydraulic device on the lower traveling body 2 side). A rectangular maintenance opening 10 for performing maintenance (inspection, repair, etc.) such as a swivel joint) is opened.

  Reference numeral 11 denotes a cover plate for covering the maintenance opening 10. The cover plate 11 has a rectangular shape corresponding to the shape of the maintenance opening 10, and is formed at one of the four corners. Is formed with a round hole-shaped bolt insertion hole 13 through which a bolt 12 for fixing the cover plate 11 to the base frame 9 is inserted, and U-shaped through which the bolt 12 is inserted at the other three corners. The bolt insertion groove 14 is opened.

  The bolt insertion hole 13 has a round hole shape as described above, and the hole diameter is designed to be larger than the shaft diameter of the bolt 12, but the bolt insertion hole 13 has a shaft diameter of the bolt 12. It is formed so as to communicate with the outer peripheral edge of the cover plate 11 through a narrow groove 13a having a narrower groove width. The bolt 12 inserted into the bolt insertion hole 13 has a configuration in which the groove width of the narrow groove 13a is narrower than the shaft diameter of the bolt 12, and thus cannot be pulled out to the outer peripheral edge side of the cover plate 11. . Further, the bolt insertion hole 13 is formed by suspending the cover plate 11 with a hook (not shown) having a thickness that does not come out of the narrow groove 13a using the bolt insertion hole 13. It can be used as a suspension hole for required movement, transportation, etc. during painting.

  The bolt insertion groove 14 is U-shaped having a groove width larger than the shaft diameter of the bolt 12 and opened on the outer peripheral edge side of the cover plate 11. It is designed so that the groove directions of the bolt insertion grooves 14 formed in are substantially parallel to each other.

  On the other hand, when the maintenance opening 10 is covered with the cover plate 11, a through hole 9 a through which the bolt 12 passes is formed in the lower surface of the base frame 9 at a portion corresponding to the bolt insertion hole 13 and the bolt insertion groove 14. In addition, a nut 15 into which the bolt 12 is screwed is integrally fixed to the upper portion of the through hole 9a by welding or the like.

In the present embodiment, the cover plate 11 is formed by cutting a plate material using a laser (not shown), but the bolt insertion hole is formed in one step of cutting the outer peripheral edge of the cover plate 11. 13 and the bolt insertion groove 14 can be formed simultaneously.
That is, since the bolt insertion groove 14 is open on the outer peripheral edge side of the cover plate 11 as described above, the bolt insertion groove 13 can of course be laser-cut in a continuous state from the outer peripheral edge of the cover plate 11. As for the cutting trajectory by laser cutting, the outer periphery of the cover plate 11 again passes from the outer peripheral edge of the cover plate 11 through the one side groove edge of the narrow groove 13a, the inner peripheral edge of the bolt insertion hole 13, and the other side groove edge of the narrow groove 13a. It can be continuously cut to reach the periphery. Thus, the bolt insertion hole 13 and the bolt insertion groove 14 can be simultaneously formed in one continuous process of laser cutting for forming the cover plate 11.

  In this embodiment configured as described, a maintenance opening 10 is formed on the lower surface of the base frame 9. Of the four corners of the cover plate 11 covering the maintenance opening 10, one corner is round. Circular bolt insertion holes 13 are opened, and U-shaped bolt insertion grooves 14 are opened at the remaining three locations. Thus, when the cover plate 11 is attached to the base frame 9, first, the bolt 12 is inserted into the bolt insertion hole 13 and screwed into the nut 15, so that the cover plate 11 is temporarily supported by the base frame 9. After that, even if the operator removes his / her hand from the cover plate 11, there is no fear that the cover plate 11 will fall, and the remaining three bolt insertion groove 14 bolts 12 are fixed. Work can be done easily. Further, when removing the cover plate 11, the bolt 12 inserted into the bolt insertion hole 13 and the bolt insertion groove 14 at one location (the lower left bolt insertion groove 14 in FIG. 3A) is removed from the nut 15. The bolts 12 inserted into the remaining two bolt insertion grooves 14 (upper right and lower right bolt insertion grooves 14 in FIG. 3A) are simply loosened and the cover plate 11 can be bolted without having to be removed from the nut 15. If it moves parallel to the groove direction of the insertion groove 14, the bolt 12 can come out of the bolt insertion groove 14 and the cover plate 11 can be removed. Then, by removing the cover plate 11 with the two bolts 12 left in this way, the attachment work when attaching the cover plate 11 to the base frame 9 again becomes easier. Furthermore, when it is desired to look inside the base frame 9 from the maintenance opening 10 without removing the cover plate 11 at the time of inspection or the like, the bolts 12 inserted into the three bolt insertion grooves 14 are removed from the nut 15. After removing, if the bolt 12 inserted into the bolt insertion hole 13 is slightly loosened, the cover plate 11 can be rotated using the bolt 12 as a support shaft, and thus the maintenance opening can be opened. .

Thus, in the present embodiment, one of the bolt insertion portions established in the cover plate 11 is a round circular bolt insertion hole 13 and the remaining is a U-groove bolt insertion groove 14. In this case, when the cover plate 11 is formed by laser cutting, the bolt insertion hole 13 is larger than the shaft diameter of the bolt 12. Since the narrow groove 13a communicates with the outer peripheral edge portion of the cover plate 11 and the bolt insertion groove 14 is opened on the outer peripheral edge side of the cover plate 11, the cover plate 11 is attached as described above. The bolt insertion hole 13 and the bolt insertion groove 14 can be simultaneously formed in one continuous laser cutting process for forming, and the productivity of the cover plate 11 is greatly improved.
The present invention can be widely applied not only to the cover plate described above but also to cover members that cover various openings provided in the construction machine. Of course, when the cover member is formed by gas cutting or plasma cutting, the same effect as laser cutting can be obtained.

It is a side view of a hydraulic excavator. It is a bottom view of the hydraulic excavator which abbreviate | omitted the operation part. (A) is the principal part enlarged view of FIG. 2, (B) is XX expanded sectional drawing of (A). (A) is a top view of a cover board, (B) is XX sectional drawing of (A), (C) is an enlarged view of a bolt insertion hole part.

Explanation of symbols

9 Base frame 10 Opening for maintenance 11 Cover plate 12 Bolt 13 Bolt insertion hole 13a Narrow groove 14 Bolt insertion groove

Claims (5)

  In forming a bolt insertion hole into which a bolt for fixing the cover member is inserted into a cover member covering an opening provided in the construction machine, the bolt insertion hole has a groove width narrower than the bolt shaft diameter. A cover member in a construction machine, wherein the cover member is formed so as to communicate with an outer peripheral edge portion of the cover member through a narrow groove.   In forming the bolt insertion hole according to claim 1 by using a cutting means such as laser cutting or gas cutting, the cutting locus of the cutting means is from the outer peripheral edge of the cover member to one side groove edge of the narrow groove, bolt insertion A cover member for a construction machine, wherein the cover member is continuously formed so as to reach the outer peripheral edge of the cover member via the inner peripheral edge of the hole and the other groove edge of the narrow groove.   The cover member in a construction machine, wherein the bolt insertion hole according to claim 1 or 2 can be used as a suspension hole for suspending the cover member.   In forming a plurality of bolt insertion portions into which bolts for fixing the cover member are inserted into a cover member covering an opening provided in the construction machine, at least one of the bolt insertion portions is a bolt A circular bolt insertion hole communicating with the outer peripheral edge of the cover member through a narrow groove having a groove width narrower than the shaft diameter, while the other bolt insertion portion has a groove width wider than the bolt shaft diameter and a cover member A cover member in a construction machine, characterized in that a U-shaped bolt insertion groove opened on the outer peripheral edge side.   5. The cover member in a construction machine according to claim 1, wherein the cover member is a cover plate for covering an opening formed in a lower surface of the traveling body frame of the construction machine. .

Images