JP4984923B2 - Construction machine upper frame - Google Patents

Description

  The present invention relates to an upper frame of a swing type construction machine configured by mounting an upper swing body on a lower traveling body like a hydraulic excavator.

  For example, in the hydraulic excavator, as shown in FIG. 5, an upper swing body 2 is mounted on a crawler type lower traveling body 1 so as to be rotatable around a vertical axis (rotation center) O, and an upper serving as a base of the upper swing body 2 Various facilities including a cabin 4 are mounted on the frame 3, a work attachment 8 including a boom 5, an arm 6 and a bucket 7 is mounted on the front of the frame 3, and a counterweight 9 is mounted on the rear end. Configured.

  In this specification, the position of the cabin 4 is defined as the left front portion, and the directions of “left and right” and “front and rear” are defined based on this position.

  FIG. 6 shows a conventional upper frame structure.

  The upper frame 3 includes a center section A located at the center in the vehicle width direction and left and right side decks B and C provided on the left and right sides of the center section A. A counter weight 9 is mounted on each of the middle work attachment 8 and the rear end.

  The arrangement of various facilities mounted in each section A to C is shown by a two-dot chain line in FIG.

  In the center section A, an engine 10 as a power source is mounted at the rear.

  On the left side deck B, a cabin 4, a fuel tank 11, and a radiator 12 are mounted in order from the front.

  On the right side deck C, a battery 13, a hydraulic oil tank 14, and a control valve 15 are mounted in order from the front.

  The center section A includes, as main components, a bottom plate 17 to which a pivot bearing (also shown in FIG. 5) 16 is attached on the lower surface, and a pair of left and right extending in the front-rear direction vertically attached to the left and right sides of the upper surface of the bottom plate 17. And vertical plates 18 and 19.

  As shown in FIG. 5, the vertical plates 18 and 19 are formed in a substantially triangular shape in a side view as a whole, and the work attachment 8 is attached to the apex portion thereof.

  Further, a partition plate 20 is provided at the rear part between the two vertical plates 18 and 19 of the center section A, and a motor mounting plate 21 to which a turning motor (not shown) as a turning drive source is attached is fixed to the partition plate 20 by welding.

  On the other hand, the left and right side decks B and C are configured by attaching a plurality of front and rear transverse beams extending in the left-right direction to the outer surfaces of the left and right vertical plates 18 and 19, and attaching a flat plate and a reinforcing material as appropriate to the base.

  For example, as shown in FIGS. 6 to 8, the right side deck C on the opposite side of the cabin 4 has three front and rear cross beams 22, 23, 24 fixed to the outer surface of the right vertical plate 19 by welding. A horizontal upper plate 25 is attached.

  In such an upper frame 3, the fuel tank 11 that has been mounted on the deck B so far has been replaced with the right side deck as equipment (particularly, the cabin 4 and the radiator 12) mounted on the left side deck B has recently increased in size. It was necessary to relocate to C.

  As a result, heavy equipment is concentrated on the right side deck C and the load applied to the deck C (see FIG. 8) increases, and this large load is applied to the right vertical plate 19 through the lateral beams 22 to 24 of the deck C. The vertical plate 19 has been deformed such as falling outward as indicated by a two-dot chain line in FIG.

  As a countermeasure against this point, it is conceivable to increase the strength of the right vertical plate 19 itself and the strength of attachment to the bottom plate 17 by increasing the thickness of the right vertical plate 19, but this makes the right vertical plate 19 heavier. This is not preferable because it increases the weight of the entire upper frame. This is the same when another reinforcing member is provided on the right vertical plate 19 or its mounting portion.

  On the other hand, as another countermeasure, it is conceivable to employ a known technique disclosed in Patent Document 1.

  This known technique will be described with reference to the names and symbols of the conventional upper frame shown in FIG. 6. For the purpose of increasing the rigidity of the entire upper frame, the partition plate 20 is eliminated while the motor mounting plate 21 is replaced with the left and right vertical plates. 18 and 19, and the right and left ends thereof are welded and fixed to the inner surfaces of both vertical plates 18 and 19.

  According to this configuration, since the right vertical plate 19 is reinforced by the motor mounting plate 21, there is an effect in that the deformation of the right vertical plate 19 due to the increase in the right load is suppressed. In addition, since the originally required motor mounting plate 21 is used as a reinforcing material, the weight of the upper frame does not increase as compared with the case where the thickness of the right vertical plate 19 is increased or another reinforcing material is added.

Further, although Patent Document 1 does not describe the purpose or effect, it is illustrated that the motor mounting plate 21 is mounted on the right vertical plate 19 so as to be overlapped with the mounting position of a part of the horizontal beam of the right side deck 19. ing. By so doing, the portion of the right vertical plate 19 to which the load is transmitted from the cross beam is directly reinforced by the motor mounting plate 21, so that the deformation suppressing effect can be further enhanced.
Japanese Patent Laid-Open No. 11-100822

  However, according to this known technique, the motor mounting plate 21 is symmetrical with respect to the motor center X (the motor center in a state where the turning motor is mounted on the plate 21) X, and has a long longitudinal range on both the left and right sides. Since it is formed in a rectangular shape having a sufficient width (front-rear direction) dimension so that it can be attached to the vertical plates 18, 18, the area of the plate 21 is increased, which is markedly greater than the motor mounting plate 21 shown in FIG. 6. Become heavier.

  In this case, as in the case where the thickness of the right vertical plate 19 is increased or a reinforcing material is added, there is an adverse effect of increasing the weight of the entire upper frame. However, if the width of the motor mounting plate 21 is reduced, a sufficient reinforcing effect cannot be obtained for the right vertical plate 19.

  Therefore, the present invention effectively reinforces the vertical plate without incurring the adverse effect of increasing the weight of the entire upper frame under the condition that the load burden of the vertical plate on the anti-cabin side (right side in the above example) increases. An upper frame of a construction machine that can suppress the deformation is provided.

  The invention of claim 1 includes a center section having left and right vertical plates extending in the front-rear direction, a cabin side side deck provided on one of the left and right sides of the center section and mounted with a cabin, and provided on the opposite left and right sides. It consists of an anti-cabinet side deck on which equipment is mounted, and a motor mounting plate to which a turning motor is attached is provided between the vertical plates of the center section, while the cross beams constituting the anti-cabinet side deck are In the upper frame of the construction machine attached to the outer surface of the vertical plate on the cabin side, among the left and right side portions sandwiching the motor center of the motor mounting plate, the anti-cabin side portion is formed longer in the front-rear direction than the cabin side portion, This anti-cabin side part is wrapped with the mounting position of the cross beam on the outer surface of the anti-cabinet side vertical plate to Those attached to the inner surface of the side vertical plates.

  According to a second aspect of the present invention, in the configuration of the first aspect, the motor center of the motor mounting plate is offset to the anti-cabin side with respect to the center line between the two vertical plates, whereby the left-right direction of the anti-cabin side portion of the motor mounting plate The dimension is formed shorter than the lateral dimension of the cabin side portion.

The invention according to claim 3, in the configuration of claim 1 or 2, as a transverse beam which constitutes the counter-cabin side of the side deck, comprising a plurality of cross beams spaced in the longitudinal direction, counter-cabin side portion of the motor mounting plate and those attached to the inner surface of the wrapped and mounting positions of the plurality of cross beams counter-cabin side vertical plate against counter-cabin side vertical plate.

  According to the present invention, on the assumption that the vertical plate on the anti-cabine side (right side in the above example) is reinforced by the motor mounting plate, it is noted that the vertical plate on the cabin side with a light load does not require reinforcement by the plate. Of the left and right side parts of the motor mounting plate across the motor center, the anti-cabin side part is formed longer in the front-rear direction than the cabin side part (the cabin side part is short), and this part is Since it is attached to the vertical plate by wrapping with the mounting position of the horizontal beam on the vertical plate, it is possible to reduce the motor mounting plate area to a minimum and lighten the plate while effectively reinforcing the anti-cabin side vertical plate it can.

  That is, deformation of the vertical plate on the anti-cabine side can be suppressed without increasing the weight of the upper frame.

  In this case, according to the second aspect of the present invention, the left-right dimension of the motor-mounting plate on the side opposite to the cabin (the lengthened in the front-rear direction) sandwiching the motor center can be reduced, so that the weight of the plate is further reduced. Can do.

  According to the invention of claim 3, since the anti-cabin side portion of the motor mounting plate is attached to the vertical plate in a state of being wrapped with a plurality of horizontal beams, the reinforcing effect of the vertical plate can be further enhanced.

  An embodiment of the present invention will be described with reference to FIGS.

  In this embodiment, the basic configuration of the upper frame 30 is the same as the conventional one.

  That is, as shown in FIGS. 1 and 2, the upper frame 30 includes a center section D located in the center in the vehicle width direction, and left and right side decks E and F provided on the left and right sides of the center section D. A work attachment 8 in FIG. 4 is mounted on the front of the center section D, and a counterweight 9 is mounted on the rear end.

  In the center section D, an engine 31 as a power source is mounted at the rear.

  The left side deck B is mounted with a cabin 32 at the front, a battery 33 at the left side of the cabin, and a radiator 34 at the rear.

  The right side deck C is equipped with a control valve 35 at the front, a fuel tank 36 at the right rear side thereof, and a hydraulic oil tank 37 at the left side.

  With such equipment arrangement, the load burden on the right side deck F becomes larger than in the case of the conventional frame structure shown in FIG. In one example, what was 610 kg in the conventional structure is 950 kg, which is a weight increase of 340 kg.

  The center section D includes, as main components, a bottom plate 38 to which the slewing bearing 16 is attached on the lower surface, and a pair of left and right vertical plates 39 and 40 that are vertically attached to the left and right sides of the upper surface of the bottom plate 38. ing.

  On the other hand, the left and right side decks E and F are configured by attaching a plurality of front and rear transverse beams extending in the left-right direction to the outer surfaces of the left and right vertical plates 39 and 40, and appropriately attaching a flat plate and a reinforcing material to the bases.

  Specifically, the right side deck F has four lateral beams 41 to 44 welded and fixed to the outer surface of the right vertical plate 40 in the front-rear direction, and a horizontal upper plate 45 is attached to these upper surfaces. Composed.

  In the upper frame 30, the following measures for reinforcing the right vertical plate 40 are taken against the increase in the load on the right side deck F.

  The motor mounting plate 46 is disposed across the left and right vertical plates 39 and 40, and both left and right ends are fixed to the vertical plates 39 and 40 by welding. The thick line in FIG. 2 shows this welded part.

  In the motor mounting plate 46, the motor center X is offset to the right side (the opposite cabin side) from the straight line (center line between the vertical plates) Y passing through the center between the vertical plates 39 and 40, and the turning center O is set. Of the sandwiched left and right side (cabin side and anti-cabin side) portions 46a, 46b, the right side portion 46b is formed in a shape (substantially L-shaped in plan view) longer than the left side portion 46a.

  Therefore, the right portion 46b of the motor mounting plate 46 is welded and fixed to the inner surface of the right vertical plate 40 in a range longer than the left portion 46a in the front-rear direction.

  Expressed numerically, as shown in FIG. 2, the front-rear direction dimension of the tip of the left portion 46a (the portion attached to the left vertical plate 39) is L1, and the tip of the right portion 46b (the portion attached to the right vertical plate 40). The front-rear direction dimension is L2, L1 <L2, and L2 is slightly more than twice L1.

  Further, the distance from the motor center X of the motor mounting plate 46 to the left vertical plate 39 (the left-right dimension of the left portion 46a) is W1, and the distance to the right vertical plate 40 (the left-right dimension of the right portion 46b) is W2. W1> W2 and W2 is almost 1/3 of W1.

  1, 2, and 4, 47 is a circular motor mounting hole centered on the turning center O. 1 and 2, the plate 46 is hatched except for the motor mounting hole 47 in order to make the outline of the motor mounting plate 46 easier to understand. Further, although a motor seat having a plurality of bolt holes is provided on the outer periphery of the motor mounting hole 47, the illustration is omitted.

  Here, the right side portion 46b of the motor mounting plate 46 is overlapped with the mounting positions of the three horizontal beams 42, 43, and 44 except the front end of the horizontal beams 41 to 44 of the right side deck F with respect to the right vertical plate 40. In this state, it is fixed to the vertical plate 40 by welding. In other words, the shape and size of the motor mounting plate 46 and the front-rear direction positions of the cross beams 42 to 44 are set so that this wrap state is obtained.

  In the upper frame 30, the left vertical plate 39 with a light load load is assumed to be reinforced by the motor mounting plate 46 on the assumption that the right vertical plate 40 is reinforced by the motor mounting plate 46, as in the known technique disclosed in Patent Document 1. Of the left and right side portions 46a and 46b sandwiching the turning center O of the motor mounting plate 46 as described above, the right side portion 46b on the anti-cabin side is longer than the left side portion 46a. Since it is formed (the left portion 46a is formed short) and attached to the inner surface of the right vertical plate 40, the vertical plate 40 can be reinforced over a long range by the long right portion 46b before and after this.

  In this case, the right side portion 46b of the plate is wrapped with the horizontal beam mounting position with respect to the right vertical plate 40, and is also wrapped with the mounting positions of the three front and rear horizontal beams 42 to 44 and fixed to the right vertical plate 40. The long range in the front-rear direction of the plate 40 can be directly and effectively reinforced at the portion where the load acts.

Moreover,
(I) The front-rear dimension (L1 at the tip) of the left portion 46a of the motor mounting plate 46 is kept small.
(II) By offsetting the motor center X to the right with respect to the center line Y between the two vertical plates, the lateral dimension W2 of the right portion 46b can be reduced, thereby reducing the area of the motor mounting plate 46 and its weight. The increase can be minimized.

  From the above points, it is possible to reliably suppress the deformation of the right vertical plate 40 with respect to the increase in the right side deck load without causing the adverse effect of increasing the weight of the entire upper frame.

Other Embodiments (1) From the viewpoint of reducing the weight of the motor mounting plate 46, it is desirable to offset the motor center X to the right with respect to the center line Y between the vertical plates as described above. It may be set on the center line Y, or offset slightly to the left. Even in this case, the weight reduction effect can be ensured by making the front-rear direction dimension of the plate left side portion 46a smaller than that of the right side portion 46b.

  (2) In the target machine of the present invention including a hydraulic excavator, since the cabin is usually disposed on the left side, the right side portion of the motor mounting plate 46 is used as a reinforcing measure for the right vertical plate 40 against an increase in the load on the right side deck F. The front-rear direction dimension of 46b will be larger than that of the left part 46a. However, in a machine in which the cabin is arranged on the right side, it is necessary to reinforce the left vertical plate 39. What is necessary is just to reverse the magnitude relationship of the dimension in the front-back direction.

It is a top view of the upper frame concerning the embodiment of the present invention. FIG. 2 is a partially enlarged view of FIG. 1. It is the III-III line expanded sectional view of FIG. It is the IV-IV sectional view taken on the line of FIG. 1 is a schematic side view of a hydraulic excavator that is an example to which the present invention is applied. It is a top view of the conventional upper frame. It is the VII-VII line expanded sectional view of FIG. It is the VIII-VIII sectional view taken on the line of FIG.

Explanation of symbols

30 Upper frame D Center section E Left side deck F Right side deck 32 Cabin 38 Bottom plate of center section 39 Left side (cabin side) vertical plate 40 Right side (anti-cabin side) vertical plate 42, 43, 44 Cross beam 46 Motor mounting plate 46a Plate left side (cabin side) 46b Plate right side (anti-cabin side) O Rotation center X Motor center Y Center line between both vertical plates L1 Plate left side longitudinal dimension L2 Plate right side longitudinal dimension L3 Plate left side Left and right dimension L4 right and left dimension of plate right side

Claims (3)

  A center section with left and right vertical plates extending in the front-rear direction, a side deck on the left and right sides of the center section on which the cabin is mounted, and a side deck on which the equipment is mounted on the opposite side A motor mounting plate, which is composed of a cabin side side deck and on which a turning motor is mounted, is provided between the vertical plates of the center section, while the transverse beam constituting the anti cabin side deck is the outer surface of the vertical plate on the anti cabin side In the upper frame of the construction machine to be attached to, the anti-cabin side portion of the left and right side portions sandwiching the motor center of the motor mounting plate is formed longer in the front-rear direction than the cabin side portion. Wrap it with the mounting position of the cross beam on the outer surface of the above anti-cabinet vertical plate and attach it to the inner surface of the anti-cabinet vertical plate. The upper frame of the construction machine, characterized in that digit.   By offsetting the motor center of the motor mounting plate to the anti-cabin side of the center line between the two vertical plates, the horizontal dimension of the anti-cabin side portion of the motor mounting plate is made shorter than the horizontal dimension of the cabin side portion. The upper frame of a construction machine according to claim 1. As crossbeam constituting the anti cabin side of the side deck, comprising a plurality of cross beams spaced in the longitudinal direction, the counter-cabin side portion of the motor mounting plate, the mounting positions of the plurality of cross beams for counter-cabin side vertical plate The upper frame of a construction machine according to claim 1 or 2, wherein the upper frame is wrapped and attached to the inner surface of the vertical plate on the side opposite to the cabin.

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