JP2013104224A - Construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a construction machine which can surely fix a cover and a vehicle body frame even when accumulated tolerance occurs during cover mounting.SOLUTION: In a construction machine including a supporting material 6 for fixing a vehicle body frame 4 and a cover material 30, and a fixing unit 24, the fixing unit 24 comprises a bolt 25 inserted respectively into a first bolt hole 17 formed in the cover material 30 and a second bolt hole 9 formed in the supporting material 6, and a nut 26 screwed with the bolt 25, the first bolt hole 17 has a hole diameter approximately equal to the external diameter of the bolt 25, the second bolt hole 9 is larger than the first bolt hole 17, and the supporting material 6 includes a mounting plate 10 formed with a third bolt hole 16 having the same diameter as the first bolt hole 17 and holding claws 15 movably holding the mounting plate 10 in the inside of the supporting material 6 so as to expose at least the third bolt hole 16 within a range of the second bolt hole 9.

Description

  The present invention relates to a construction machine, and more particularly to a construction machine in which a space for accommodating an engine, a fuel tank, and the like is formed by a body frame and a cover.

  A cover structure of a construction machine is described in Patent Document 1. In this cover structure, the cover and its related parts are integrated to improve workability when attaching the cover.

  A construction machine represented by Patent Document 1 arranges storage objects such as an engine and a fuel tank on a vehicle body frame forming a vehicle body, and covers these with a cover. The cover is fixed to a mounting portion formed on the vehicle body frame using a fixing means such as a bolt. The cover is formed separately from the vehicle body instead of one.

Japanese Patent Laid-Open No. 10-8499

However, when the divided covers are attached in order, the attachment position of the cover and the vehicle body frame may be shifted due to the accumulation tolerance.
Specifically, when bolting the cover and the vehicle body frame, the bolt hole provided in the cover and the bolt hole provided in the vehicle body frame are misaligned, so the bolt cannot be inserted and both are fixed. There are things that cannot be done.

  For this reason, conventionally, the bolt hole is made larger than the diameter of the bolt and the insertion of the bolt is ensured. However, if the bolt hole is enlarged, a problem arises in fixing reliability between the cover and the frame.

  The present invention has been made in consideration of the above prior art, and an object of the present invention is to provide a construction machine that can securely fix a cover and a vehicle body frame even when an accumulation tolerance occurs when the cover is attached. .

  To achieve the above object, in the present invention, a vehicle body frame, a cover made of a plurality of cover materials covering the vehicle body frame, a support material provided on the vehicle body frame, and the cover material fixed to the outside, In the construction machine including a fixing unit for fixing the support member and the cover member to each other, the fixing unit includes a first bolt hole provided in the cover member and a first bolt hole provided in the support member. Each of the second bolt holes and a nut into which the bolt is screwed, and the diameter of the first bolt hole is substantially the same as the outer diameter of the bolt. Is larger in diameter than the first bolt hole, and the support member has a mounting plate in which a third bolt hole having the same diameter as the first bolt hole is formed, and on the inner side of the support member. Small Both provide a construction machine characterized by having a holding claw for holding movably said mounting plate such that the third bolt holes are exposed within the second bolt holes.

  Preferably, the nut is a weld nut that is in communication with the third bolt hole and is fixed to the mounting plate by welding.

  Preferably, the support member has a substantially L-shaped cross section including a plate-shaped fixing portion in which the second bolt hole is formed and a wall portion that rises substantially vertically from one side edge of the fixing portion. The holding claws extend in a direction perpendicular to the wall portion along the fixed portion and are formed as a pair, and the mounting plate is slidable toward the wall portion along the pair of holding claws. is there.

  According to the present invention, in the process of manufacturing a construction machine by attaching a plurality of cover members to a vehicle body frame in order, an accumulation tolerance is generated, and the first bolt hole of the cover member and the second bolt of the vehicle body frame are produced. Even if the position of the bolt hole is shifted, the second bolt hole has a larger diameter than the first bolt hole, so that the bolt can be inserted into the first and second bolt holes. In addition, the support member provided on the vehicle body frame has a mounting plate having a third bolt hole, and the mounting plate is exposed so that the third bolt hole is exposed within the range of the second bolt hole. Thus, the bolt is inserted into the first and third bolt holes having the same diameter as the outer diameter of the bolt. Therefore, even if an accumulation tolerance occurs when the cover is attached to the vehicle body, the cover and the vehicle body frame can be securely fixed.

  Further, if the nut is welded and fixed to the mounting plate, the number of parts can be reduced, bolts can be inserted and screwed together, and workability can be improved.

  Moreover, the movement of the mounting plate can be limited using the wall portion by using the plate-shaped fixing portion and the wall portion as the support member and having a substantially L-shaped cross section. For this reason, the number of holding claws for limiting the movement range of the mounting plate can be reduced, and therefore the number of processing steps for forming the holding claws is reduced, and workability is improved.

1 is a schematic side view of a construction machine according to the present invention. 1 is a schematic plan view of a construction machine according to the present invention. It is a schematic perspective view of a support material. It is a schematic sectional drawing of a support material. It is a schematic plan view of a support material. It is the schematic which shows the process of attaching a cover material to a support material in order. It is the schematic which shows the process of attaching a cover material to a support material in order. It is the schematic which shows the process of attaching a cover material to a support material in order. It is the schematic which shows the process of attaching a cover material to a support material in order. It is a schematic sectional drawing of the support material using a welding nut. It is a schematic plan view of another support material which changed the number of holding claws.

  As shown in FIGS. 1 and 2, the construction machine 5 according to the present invention includes a lower traveling body 1 and an upper swing body 2. In the case of the shovel type as shown in the figure, the lower traveling body 1 is a crawler traveling body. The upper revolving unit 2 is mounted on the lower traveling unit 1 via a revolving wheel 8. Therefore, the upper swing body 2 can swing with respect to the lower traveling body 1. The upper swing body is provided with a working device 3 including a boom, an arm, and a bucket. A cab 11 serving as a driver's seat is provided on the front left side of the upper swing body 2. In addition, a counterweight 12 for balancing the work apparatus 3 as a whole vehicle body is provided behind the upper swing body 2.

  The upper swing body 2 includes a body frame 4 and a cover 20 that covers the body frame 4. The cover 20 covers the storage such as the engine 13 and the hydraulic pump 14 mounted on the vehicle body frame 4 or various tanks (not shown) such as a fuel tank and a hydraulic oil tank. The cover 20 is composed of a plurality of cover materials. As the cover material, an engine cover material 21 that covers the engine 13, a hydraulic oil tank cover material 18 that covers the hydraulic oil tank, a fuel tank cover material 19 that covers the fuel tank, and an upper surface cover material 30 that covers a substantially central portion of the upper surface of the vehicle body frame 4. There are an auxiliary cover material 31 that covers the rear of the cab 11, a right side cover material 23 that covers the left and right sides of the vehicle body frame 4, a left side cover material 22, and the like.

  As shown in FIGS. 3 to 5, the body frame 4 is provided with a support member 6 as an integral body or as a separate body. This support material 6 is provided in the site | part to which the cover material mentioned above is fixed. In the illustrated example, the support member 6 has a substantially L-shaped cross section including a plate-shaped fixing portion 7 and a wall portion 8 that rises substantially vertically from one side edge of the fixing portion 7. The fixing portion 7 is provided with a second bolt hole 9 through which a bolt for fixing the cover material is inserted. An attachment plate 10 is attached to the inside of the fixed portion 7 (the lower side in FIG. 4). A part of the fixing portion 7 is cut and folded inside, and a holding claw 15 for receiving the mounting plate 10 by being folded back is formed. Since the storage area of the mounting plate 10 formed by the plurality of holding claws 15 is larger than the area of the mounting plate 10, the mounting plate 10 can move (slide) while being held by the holding claws 15. Specifically, the length E (see FIG. 4) from the outer edge of the holding area formed by the holding claws 15 to the outer edge of the mounting plate 10 is determined in consideration of the tolerance, but from the outer edge of the mounting plate 10 Each is about 5 mm. The mounting plate 10 has a third bolt hole 16 formed therein.

  In the state where the support member 6 is provided on the vehicle body frame 4, the various cover materials described above are attached. First, as shown in FIG. 6, for example, an upper surface cover material 30 is put on the outside of the support material 6 (upper side in FIG. 6) (in the direction of arrow A in FIG. 6). At this time, since the first bolt hole 17 is formed in the upper surface cover member 30, the first bolt hole 17 and the second bolt hole 9 formed in the support member 6 are substantially aligned. Position. Specifically, since the second bolt hole 9 is larger in diameter than the first bolt hole 17, the first bolt hole 17 is aligned with the position within the range of the second bolt hole 9 to cover the upper surface cover. The material 30 is covered.

  The upper surface cover member 30 thus aligned is placed on the support member 6 as shown in FIG. However, as described above, when the construction machine 5 is manufactured, a plurality of divided cover materials are attached in order, and therefore, an accumulation tolerance occurs in the cover material attached in the latter half such as the upper surface cover material 30. Thus, the position of the first bolt hole 17 may be displaced from the specified position. FIG. 7 shows an example in which the top cover member 30 is placed in a state where such an integration tolerance occurs. However, since the second bolt hole 9 has a larger diameter than the first bolt hole 17, even if the position of the upper surface cover member 30 is slightly shifted due to the accumulation tolerance, the second bolt hole 9 is within the range of the first bolt hole 17. The bolt holes 9 can be matched.

  Thereafter, the mounting plate 10 is moved (in the direction of arrow B in FIG. 7) to align the positions of the third bolt hole 16 and the first bolt hole 17. Since the third bolt hole 16 is set in advance so as to be exposed within the range of the second bolt hole 9, a finger or the like is moved from the first bolt hole 17 to the second and third bolt holes 9, 16. The mounting plate 10 can be moved through. Then, the upper cover member 30 and the support member 6 are fixed by the fixing unit 24 in such a state that the third bolt hole 16 and the first bolt hole 17 are aligned. That is, as shown in FIG. 8, a bolt 25 and a nut 26 constituting the fixing unit 24 are prepared, and the bolt 25 is inserted into the first to third bolt holes 9, 16, and 17 from above (see FIG. 8). 8 arrow C direction). Then, the nut 26 is moved from below (in the direction of arrow D in FIG. 8), and the bolt 25 is screwed into the nut 26. Thereby, as shown in FIG. 9, the upper surface cover member 30 and the support member 6 are fixed to each other.

  At this time, the hole diameter of the first bolt hole 17 is substantially the same as the outer diameter of the bolt 25. Further, the third bolt hole 16 has the same diameter as that of the first bolt hole 17. Further, the upper cover member 30 is fixed to the vehicle body frame 4 without using the support member 6 at other positions. Therefore, even if it is the position fixed using the support material 6, the insertion of the volt | bolt 25 can be made reliable, and also the position of the volt | bolt 25 does not shift | deviate even after the upper surface cover material 30 is attached.

  As described above, in the process of manufacturing the construction machine 5 by attaching the plurality of cover materials to the vehicle body frame 4 in order, an accumulation tolerance is generated, and the first bolt hole 17 of the upper surface cover material 30 and the first frame body 4 are fixed. Even if the position of the second bolt hole 9 is shifted, the second bolt hole 9 has a larger diameter than the first bolt hole 17, so that the bolt 25 is inserted into the first and second bolt holes 17, 9. be able to. In addition, the support member 6 provided in the vehicle body frame 4 has a mounting plate 10 having a third bolt hole 16, and the mounting plate 10 has a third bolt hole 16 and a second bolt hole 9. Therefore, the bolt 25 is inserted into the first and third bolt holes 17 and 16 having substantially the same diameter as the outer diameter of the bolt 25. Therefore, even if an accumulation tolerance occurs when the cover is attached to the vehicle body, the upper surface cover 30 and the vehicle body frame 4 (support material 6) can be securely fixed.

  As another embodiment, as shown in FIG. 10, a weld nut 27 in which the nut 26 described above is welded to the mounting plate 10 may be used. As described above, if the welding nut 27 is used, the number of parts is reduced, and the bolt 25 can be inserted and screwed into the welding nut 27. Therefore, the operation is simplified and the workability is improved.

  Further, when the support member 6 having a substantially L-shaped cross section as described above is used, the holding claws 15 need only be formed in a pair extending along the fixing portion 7 in the direction perpendicular to the wall portion 8. . As described above, the movement of the support member 6 in the longitudinal direction may be restricted by the holding claws 15, and the movement in the direction perpendicular thereto may be restricted by the wall portion 8. The mounting plate 10 is mounted by sliding toward the wall portion 8 with both sides being held by the holding claws 15. Thereby, the movement of the mounting plate 10 can be restricted using the wall part 8 by making the support material 6 into a substantially L-shaped cross section using the plate-shaped fixing part 7 and the wall part 8. For this reason, the number of holding claws 15 for limiting the movement range of the mounting plate 10 can be reduced, and therefore the number of processing steps for forming the holding claws 15 is reduced, and the workability is improved.

DESCRIPTION OF SYMBOLS 1 Lower traveling body 2 Upper turning body 3 Working device 4 Car body frame 5 Construction machine 6 Support material 7 Fixing part 8 Wall part 9 Second bolt hole 10 Mounting plate 11 Cab 12 Counterweight 13 Engine 14 Hydraulic pump 15 Holding claw 16 First 3 bolt hole 17 first bolt hole 18 hydraulic oil tank cover material 19 fuel tank cover material 20 cover 21 engine cover material 22 left side cover material 23 right side cover material 24 fixing unit 25 bolt 26 nut 27 weld nut 30 top cover Material 31 Auxiliary cover material

Claims (3)

Body frame,
A cover made of a plurality of cover materials covering the body frame;
A support member provided on the vehicle body frame, the cover member being fixed to the outside;
In a construction machine including a fixing unit for fixing the support material and the cover material to each other,
The fixing unit includes a bolt inserted into a first bolt hole provided in the cover material and a second bolt hole provided in the support material, and a nut into which the bolt is screwed,
The hole diameter of the first bolt hole is substantially the same as the outer diameter of the bolt,
The second bolt hole is larger in diameter than the first bolt hole;
The support member includes a mounting plate in which a third bolt hole having the same diameter as the first bolt hole is formed, and at least the third bolt hole is formed on the inner side of the support member. A construction machine comprising a holding claw for movably holding the mounting plate so as to be exposed within a bolt hole.   The construction machine according to claim 1, wherein the nut is a welding nut that communicates with the third bolt hole and is welded to the mounting plate. The support member has a substantially L-shaped cross section having a plate-like fixing portion in which the second bolt hole is formed and a wall portion that rises substantially vertically from one side edge of the fixing portion.
The holding claws are formed only in a pair extending in the vertical direction with respect to the wall portion along the fixed portion,
The construction machine according to claim 1 or 2, wherein the mounting plate is slidable toward the wall portion along the pair of holding claws.

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