JP2009214655A - Opening cover of work machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily standardize an opening cover of a work machine as a product by a simple configuration. <P>SOLUTION: A cover member 1 completely covering an opening 5 is formed into a plurality of segments which are disposed in a mutually superimposed manner. A holding member 2 is fixedly disposed at an inner surface of the cover member 1 to hold the tail end of the opening 5, and the cover members 1 are fixed to each other by a fixing member 3. The holding member 2 has a first holding portion 2a to form a first predetermined width of a clearance to the inner surface of the cover member 1 and a second holding portion 2b to form a smaller second predetermined width of the clearance, thereby providing a two-staged sectional shape. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an opening cover for closing an opening provided in a work machine.

  In the lower traveling body of the hydraulic excavator, an opening is formed immediately below the swing circle. The opening is provided for maintenance of a swivel joint disposed in the swing circle, and is closed with a cover during normal use. On the other hand, the cover is removed during maintenance so that the swivel joint can be accessed from the underside of the vehicle body.

  Such an opening cover is illustrated in Patent Document 1, for example. In this case, the inspection hole formed in the lower center surface of the car body in the small turning backhoe is closed with a single bottom cover. Japanese Patent Application Laid-Open No. H10-228561 shows a case where the maintenance opening is closed using two semicircular guard plates (covers). In this example, the guard plate is divided into a plurality of pieces, thereby reducing the weight of the guard plate per piece and improving the mounting workability.

By the way, the opening cover as described above is generally fastened and fixed directly to the lower body plate by bolting. On the other hand, as shown in FIG. 8, for example, an opening cover 11 is divided into a first cover 11a and a second cover 11b, and a plurality of L-shaped brackets 12 are fixed to each. . Here, a bolt fastening hole 13 is drilled in the overlapping portion of the first cover 11a and the second cover 11b, and a nut 14 is fixed to the upper surface of the first cover 11a by welding. Thus, the workability at the time of assembling can be improved by sandwiching the car body lower plate with the L-shaped bracket 12 and overlapping the first cover 11a and the second cover 11b and fastening with the bolts. it can.
JP-A-11-278300 Japanese Patent Laid-Open No. 10-18348

  However, in the opening cover as shown in FIG. 8, it is necessary to set the shape of the bracket 12 in accordance with the thickness of the car body lower plate. There is a problem that it is difficult to standardize products. If the thickness of the car body lower plate is thinner than the gap between the bracket 12 and the surface of the cover itself, the opening cover 11 can be attached, but the whole may be rattled and noise may occur. End up.

  The present invention has been made in view of such problems, and an object thereof is to provide an opening cover for a work machine that can easily standardize a product with a simple configuration.

  In order to achieve the above object, the opening cover of the working machine of the present invention according to claim 1 is a cover that closes the opening provided in the working machine, and is divided into a plurality of sheets and overlapped with each other. A cover member that covers the entirety of the opening, a clamping member that is fixed to the inner surface of each of the plurality of cover members, and sandwiches the edge of the opening between the inner surface, and a plurality of sheets A fixing member for fixing the cover members to each other, wherein the holding member forms a first predetermined width gap between the holding member and the inner surface, and the opening is more than the first holding portion. And a second sandwiching portion that is arranged in the inner direction and forms a gap having a second predetermined width narrower than the first predetermined width between the inner surface and the inner surface.

For example, it is preferable that the clamping member has a two-stage sectional shape including the first clamping part and the second clamping part.
Further, in the opening cover of the working machine according to the second aspect of the present invention, in addition to the configuration of the first aspect, the fixing member is a fastening member that fastens and fixes a plurality of the cover members. A plurality of the cover members, each having a mounting hole through which the fastening member is inserted, the mounting hole corresponding to the overlapping width when the edge portion is sandwiched by the first clamping portion; and It has the 2nd attachment hole corresponding to the overlap width when this edge part is clamped by this 2nd clamping part, It is characterized by the above-mentioned.

For example, it is preferable that the cover member includes the mounting holes arranged in a two-stage arrangement shape including the first mounting holes and the second mounting holes.
The opening cover of the work machine of the present invention according to claim 3 is the fastening member for fastening and fixing a plurality of the cover members to each other in addition to the configuration according to claim 1, A plurality of the cover members each having a mounting hole through which the fastening member is inserted, and the mounting hole corresponds to the overlapping width when the edge portion is clamped by the first clamping portion; It is a long hole capable of fixing the fastening member at both of the positions corresponding to the overlapping width when the edge portion is sandwiched by the sandwiching portion. For example, the first mounting hole and the second mounting hole in the opening cover of the work machine according to the second aspect of the present invention may be formed as one long hole.

  The opening cover is a cover for closing a maintenance opening provided below the swivel (swivel joint) on the lower surface of the car body of the work machine, and the cover member is provided on the lower surface side of the work machine. The opening is preferably closed substantially horizontally.

  According to the opening portion cover of the working machine of the present invention (Claim 1), the sandwiching member includes a sandwiching portion having two types of widths (for example, the sectional shape of the sandwiching member is multi-staged). The same opening cover can be used in common for openings having different plate thicknesses, and it is easy to make parts common and standardize. Further, even if the plate thicknesses are different, the pinching member can accurately pinch, so that rattling can be prevented.

  Moreover, according to the opening part cover (Claim 2, 3) of the working machine of this invention, the overlap margin of cover members can be changed easily.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 6 are for explaining an opening cover of a working machine according to an embodiment of the present invention, and FIG. 1 shows a configuration of a base frame of the working machine to which the opening cover is applied. FIG. 2 is a perspective view showing the overall configuration of the main opening cover, FIG. 3 is a diagram showing the configuration of the main opening cover, (a) is a top view, (b) is a side view, and (c). Is a cross-sectional view [A-A cross-sectional view of (a)]. FIG. 4 is an example showing the cross-sectional shape of the bracket, where (a) is a cut-out manufactured, (b) is a plurality of plates welded stepwise, and (c) is cast. A thing (d) shows what was manufactured by fusing.

Further, FIG. 5 is a view for explaining a state of application of the present opening cover to the car body underside of the plate thickness t _1, (a) is a fragmentary sectional view, (b) is a top view, (c) FIG. Similarly, FIG. 6 is a view for explaining a state of application of the present opening cover to the car body underside of plate thickness t _2, (a) is a fragmentary sectional view, (b) is a top view, (c ) Is a side sectional view. 7A and 7B are diagrams showing the configuration of the opening cover according to the modification of the present invention, where FIG. 7A is a top view and FIG. 7B is a side view.

[Constitution]
The opening cover according to the present invention is applied to a base frame 8 of a hydraulic excavator shown in FIG. The base frame 8 is a structure that supports the entire lower traveling body of the hydraulic excavator. The base frame 8 includes a pair of left and right track frames 7 and a car body 6 that is horizontally bridged between them in the vehicle width direction. The track frame 7 is a structure that forms the framework of the crawler device, and the car body 6 is a structure that supports the upper swing body.

  The car body 6 includes two plate members extending in the horizontal direction, which are referred to as a car body upper plate 6a and a car body lower plate 6b. A ring-shaped swing circle for horizontally turning the upper swing body is fixed to the car body upper plate 6a. On the other hand, the car body lower plate 6b is provided with an opening 5 immediately below the swing circle. The opening cover according to the present invention is a cover member 1 that horizontally closes the maintenance opening 5 from the lower surface side of the car body 9.

As shown in FIG. 2, the cover member 1 is divided into two first covers 1 a and second covers 1 b, and these are overlapped and fastened to close the entire opening 5. . A mounting hole 4 for fixing with a fastening member (fixing member) 3 such as a bolt 3a and a nut 3b is formed in the overlapping portion of each cover member 1.
As shown in FIGS. 3A and 3B, a plurality of mounting holes 4c are arranged in a row on one side of the first cover 1a. Nuts 3b are fixed to the upper surfaces of the mounting holes 4c in advance by welding. On the other hand, in the second cover 1b, a plurality of first mounting holes 4a and second mounting holes 4b are arranged in two rows corresponding to the mounting holes 4c of the first cover 1a. That is, the position of the mounting hole 4c of the first cover 1a coincides with one of the first mounting hole 4a and the second mounting hole 4b, and the bolt 3a is fastened and fixed from below, so that the first cover 1a and the second cover 1a The overlapping width when fixed to the cover 1b can be changed in two stages.

  Further, as shown in FIG. 3A, two brackets 2 are fixed on the upper surfaces of the first cover 1a and the second cover 1b. This bracket 2 fixes each cover member 1 by sandwiching the edge of the opening 5. As shown in FIG. 2, the shape of the bracket 2 is a substantially L-shaped angle, and the direction toward the outside of the opening 5 (from the center of the cover member 1 to the outer edge in a state where the cover members 1 are overlapped). Oriented so that a gap opened toward the

Moreover, the cross-sectional shape of the bracket 2 is multi-staged as shown in FIG. That the bracket 2 is a first clamping portion 2a gap dimension becomes t _1, the second clamping portion 2b serving as a narrow gap dimension t ₂ than it forms between the upper surface of the cover member 1 . The 2nd clamping part 2b is provided in the inner side direction (direction which goes to the center from the outer edge of the cover member 1 in the state which overlap | superposed each cover member 1) rather than the 1st clamping part 2a. That is, the edge of the opening 5 is sandwiched between one of the first sandwiching portion 2a and the second sandwiching portion 2b so that it can correspond to two types of car body lower plates 6b having different thicknesses. It has become. Between the first clamping portion 2a and the second clamping portion 2b, so that the amount corresponding step 2c of the difference between the clearance t ₁ -t ₂ is formed.

  In addition, as shown to Fig.4 (a), in this embodiment, this bracket 2 is formed as a steel block machined product. As another forming method, as shown in FIG. 4 (b), a plurality of plates may be fixed by welding to form a stepped shape, or as shown in FIG. 4 (c), as a casting Alternatively, as shown in FIG. 4 (d), the plate may be melted and cut using a technique such as laser cutting, plasma cutting, or gas cutting.

[Action]
The attached state of the cover member 1 of the plate thickness of the car body lower plate 6b is t ₁ shown in FIG. 5 (a) ~ (c) . When the car body lower plate 6b is sandwiched between the brackets 2 and the small edge surface 6c at the edge of the opening 5 is brought into contact with the step 2c, the car body lower plate 6b is sandwiched between the first clamping portion 2a and the cover member 1. Thus, the position of the cover member 1 with respect to the opening 5 is fixed.

Subsequently, when the mounting hole 4c of the first cover 1a and the first mounting hole 4a of the second cover 1b are accurately aligned and the overlapping portion is fastened using the fastening member 3, the cover members 1 are fixed to each other. . At this time, as shown in FIGS. 5B and 5C, the overlap margin between the cover members 1 increases.
Further, the plate thickness of the car body lower plate 6b is t _2, as shown in FIG. 6 (a) ~ (c) , small surface 6c of the edge of the opening portion 5 of the second clamping portion 2b The car body lower plate 6b hits the back surface 2d and is sandwiched between the second sandwiching portion 2b and the cover member 1. At this time, the 1st cover 1a and the 2nd cover 1b move to the outer side direction of the opening part 5 mutually rather than the attachment state shown to Fig.5 (a)-(c). Therefore, as shown in FIGS. 6B and 6C, the overlap margin between the cover members 1 is reduced.

  On the other hand, the second cover 1b is provided with a second mounting hole 4b alongside the first mounting hole 4a. Therefore, if the arrangement distance is appropriately set, the mounting hole 4c of the first cover 1a and the second mounting hole 4b of the second cover 1b are accurately aligned. Then, when the overlapping portion is fastened using the fastening member 3, the cover members 1 are fixed.

[effect]
As described above, according to the present opening cover, it is possible to cope with a case where the plate thickness of the opening 5 is different with a simple configuration in which the cross-sectional shape of the bracket 2 is two steps. It becomes easy to standardize members and standardize between grades.

Further, as shown in FIG. 5 (a), the plate thickness of the edge of the opening 5 is t _1, the first clamping portion 2a is restrained from moving in the vertical direction of the cover member 1, step Since 2c restrains the movement in the horizontal direction, there is no backlash. Similarly, as shown in FIG. 6 (a), the plate thickness of the edge of the opening 5 is t _2, the second clamping portion 2b to restrain movement in the vertical direction of the cover member 1, the back surface Since 2d restrains the movement in the horizontal direction, rattling does not occur. Therefore, regardless of the thickness of the periphery of the opening 5, the bracket 2 can be accurately sandwiched, and the cover member 1 can be firmly fixed.

  In addition, since the first mounting holes 4a and the second mounting holes 4b are formed in advance in the second cover 1b in two rows, the alignment of the cover members 1 can be performed accurately and easily. Can be easily changed.

[Others]
Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.
For example, although the cross-sectional shape of the bracket 2 is two steps in the above-described embodiment, the number of steps may be further increased to increase the number of steps. With such a configuration, it becomes possible to cope with a larger plate thickness. In the above-described embodiment, two rows of attachment holes 4a and 4b are formed in the second cover 1b. However, the number of rows of attachment holes may be increased according to the number of steps of the cross-sectional shape of the bracket 2.

Moreover, as shown to Fig.7 (a), (b), it is also considered that the 1st attachment hole 4a and the 2nd attachment hole 4b in the above-mentioned embodiment are connected, and it forms as one elongate hole 4d. Even with such a configuration, the same effects as those of the above-described embodiment can be obtained.
Note that the mounting hole 4 is not necessarily essential, and for example, a configuration in which a hole is appropriately drilled when the opening cover is mounted may be considered. Alternatively, when the fastening members such as the bolt 3a and the nut 3b are not used (when a hook-shaped locking member is used or when a clip is used), the mounting hole 4 may not be provided. What is necessary is just to provide the fixing member which fixes the overlapping part of the 1st cover 1a and the 2nd cover 1b mutually at least.

In the above-described embodiment, the nut 3b is welded and fixed to the upper surface of the first cover 3a. However, when the cover member 1 has a certain thickness, it is directly attached to the inner peripheral surface of the mounting hole 4 instead of the nut 3b. The screw may be cut off. Even in such a configuration, the first cover 1a and the second cover 1b can be fixed.
In the above-described embodiment, the present invention is applied to the maintenance opening 5 provided on the lower surface of the lower traveling body of the hydraulic excavator. However, the application target of the present invention is not limited to this, It can be applied as a general cover for closing the opening of the work machine.

It is a perspective view which shows the structure of the base frame of the working machine with which the opening part cover which concerns on one Embodiment of this invention was applied. It is a perspective view showing the whole opening part cover composition concerning one embodiment of the present invention. It is a figure which shows the structure of the opening part cover which concerns on one Embodiment of this invention, (a) is the top view, (b) is the side view, (c) is the sectional view [AA of (a). Sectional view]. It is an example figure which shows the bracket cross-sectional shape of the opening part cover concerning one Embodiment of this invention, (a) is what was cut and produced, (b) is what a plurality of plates were welded stepwise, ( c) shows what was cast and (d) shows what was made by fusing. Is a diagram for explaining a state in which the opening cover is applied to a car body bottom surface of the plate thickness t ₁ according to an embodiment of the present invention, (a) is its cross sectional view, (b) is a top view thereof (C) is the sectional side view. Is a diagram for explaining a state in which the opening cover is applied to a car body bottom surface of the plate thickness t ₂ according to an embodiment of the present invention, (a) is its cross sectional view, (b) is a top view thereof (C) is the sectional side view. It is a figure which shows the structure of the opening part cover which concerns on the modification of this invention, Comprising: (a) is the top view, (b) is the side view. It is a perspective view which shows the structure of the opening part cover which concerns on a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cover member 1a 1st cover 1b 2nd cover 2 Bracket (clamping member)
2a 1st clamping part 2b 2nd clamping part 3 Fastening member (fixing member)
3a bolt 3b nut 4 mounting hole 4a first mounting hole 4b second mounting hole 4c mounting hole 4d long hole 5 opening 6 car body 6a car body upper plate 6b car body lower plate 7 track frame 8 base frame

Claims (3)

A cover for closing an opening provided in the work machine,
A cover member that is divided into a plurality of sheets and is arranged so as to overlap each other to cover the entire opening;
A clamping member fixed to the inner surface of each of the plurality of cover members, and sandwiching the edge of the opening between the inner surface;
A fixing member for fixing the plurality of cover members to each other;
The sandwiching member is disposed between the first sandwiching portion that forms a first predetermined width gap with the inner surface and the inner surface of the opening with respect to the first sandwiching portion. An opening portion cover for a work machine, comprising: a second clamping portion that forms a gap having a second predetermined width narrower than the one predetermined width. The fixing member is a fastening member that fastens and fixes a plurality of the cover members,
A plurality of the cover members have mounting holes through which the fastening members are inserted,
The mounting hole corresponds to the first mounting hole corresponding to the overlapping width when the edge portion is clamped by the first clamping portion, and the first mounting hole corresponding to the overlapping width when the edge portion is clamped to the second clamping portion. The opening cover for a work machine according to claim 1, further comprising two mounting holes. The fixing member is a fastening member that fastens and fixes a plurality of the cover members,
A plurality of the cover members have mounting holes through which the fastening members are inserted,
The mounting hole is at both a position corresponding to the overlapping width when the edge is held by the first holding portion and a position corresponding to the overlapping width when the edge is held by the second holding portion. The opening part cover of the working machine according to claim 1, wherein the opening member is a long hole capable of fixing the fastening member.

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