JP5158013B2 - Construction machinery - Google Patents

Description

  The present invention relates to a construction machine such as a hydraulic excavator, which covers an engine room from above with a hood and has a driver seat on the hood.

  The background art will be described by taking a small hydraulic excavator (mini excavator) which is a preferred example of the present invention as an example.

  As shown in FIGS. 5 and 6, the mini excavator has an upper swing body 2 rotatably mounted on a crawler type lower traveling body 1, and a boom 3, an arm 4, a bucket 5, and these are mounted on the upper swing body 2. A work attachment 9 composed of each hydraulic cylinder (boom cylinder, arm cylinder, bucket cylinder) 6 to 8 to be driven is mounted.

  An engine room 13 surrounded by left and right side panels (only one side is shown) 11, a bonnet 12 and the like is provided at the rear of the upper frame 10 constituting the upper swing body 2, and an engine, a battery, a radiator, a fuel tank, not shown, Devices such as a hydraulic oil tank are accommodated in the engine room 13.

  The bonnet 12 is formed in an L shape that covers the upper surface side and the rear surface side of the engine room 13, and rotates around a bonnet shaft (hinge) 14 provided at the front end portion to open and close both the upper surface and rear surface openings. Is attached to the upper frame 10.

  FIG. 5 shows a state where the hood 12 is closed, and FIG. 6 shows an opened state, and maintenance of the devices is performed in the opened state.

  Further, a driver's seat 15 is provided on the hood 12, and the operator's operation levers (not shown) provided on the left and right sides of the driver's seat 12 are operated with the operator O seated on the driver's seat 15 as shown in the figure. Do.

  The above configuration is shown in Patent Document 1.

  In this mini excavator, conventionally, as a bonnet support structure, a structure in which a support frame assembled in a gate shape or the like with a beam material is erected on the upper frame 10 before and after the engine room 13 and left and right, and the bonnet 12 is supported on four sides. ing.

JP 2001-107394 A

  However, according to the conventional bonnet support structure as described above, the support frame is located at both the left and right and rear openings of the engine room 13, that is, the maintenance port for accessing the equipment accommodated in the engine room 13. The frame interfered with the maintenance of the equipment, and was particularly an obstacle when replacing the equipment.

  Therefore, the present invention provides a construction machine in which the bonnet support structure does not interfere with the maintenance of the equipment in the engine room and can support the bonnet stably.

  According to the first aspect of the present invention, the upper part of the upper frame mounted on the lower traveling body has an engine room having an upper surface and a rear surface opened at the rear part thereof, and the opening part of the engine room is rotated by using the front side as a fulcrum. In a construction machine provided with a hood that opens and closes and a driver's seat is provided on the hood, as a hood support means for supporting the hood in a closed state, the front end of the hood is extended over a certain length range in the hood width direction. And a rib-shaped support member made of a pipe material or the like. The support member has a vertical section in which the upper end of the engine room is cut vertically and the front end is connected to the intermediate portion in the left-right direction of the front frame. A side part, a horizontal side part extending from the rear end of the vertical side part to the left or right side, and a hanging side from the front end of the horizontal side part are attached to the upper frame. It is those that have been constructed by the pillar after that.

According to a second aspect of the invention, the mounting in the configuration of claim 1, said front frame is formed in a gate-shaped cross beam is bridged between the left right sides anterior column, the lower end of the both sides before pillars above the upper frame It is what was done.

  According to a third aspect of the present invention, in the configuration of the first or second aspect, the mount member that partially contacts the lower surface of the bonnet and receives a load from above the bonnet is arranged on both the left and right sides of the vertical side portion of the support member. Is provided.

  According to a fourth aspect of the present invention, in the configuration of the third aspect, the left and right mounting members are provided in contact with the rear lower surface of the bonnet.

  According to a fifth aspect of the present invention, in the configuration of the third or fourth aspect, one of the two side mount members is mounted on a fuel tank installed on one of the left and right sides of the engine room.

  A sixth aspect of the present invention is the construction according to any one of the first to fifth aspects, wherein the damper that assists in opening and closing the bonnet is attached between the front frame and the bonnet.

  According to the present invention, since the bonnet support means is constituted by the front frame and the support member that vertically cuts the upper portion of the engine room, there is no bonnet support structure on both the left and right sides of the engine room, and the hood is opened.

  For this reason, maintenance including replacement of equipment installed in the engine room, particularly equipment arranged on both the left and right sides (for example, a radiator, a battery, and a hydraulic oil tank with high maintenance frequency) is facilitated.

  Moreover, since it consists only of a frame material (front frame) and a rib-shaped support member, it is simple, lightweight, low cost, and easy to assemble.

  In addition, the front frame and the support member support each other, and the vertical side portion of the support member with respect to a longitudinal load and the front frame and the lateral side portion with high resistance against a torsional load each have a high resistance. Therefore, it has sufficient strength as a bonnet support means, and a necessary bonnet support function can be ensured.

In this case, according to the invention of claim 2, the previous frame, because formed in a gate-shaped cross beam is bridged between the left right sides anterior column, the previous frame has sufficient strength by itself.

  Moreover, since both front pillars should just be attached to an upper frame bottom face, even if there is an unevenness | corrugation in an upper frame bottom face, both front pillars can be attached easily.

  According to the third to fifth aspects of the present invention, since the mount members are provided on both the left and right sides with the vertical side portion interposed therebetween, the bonnet support strength is enhanced by supporting the bonnet on the intermediate portion in the width direction and on both the left and right sides. Can do.

  In particular, according to the invention of claim 4, since the mount member is provided at the rear end portion where the bonnet supporting force is slightly thin, the bonnet supporting state can be further stabilized.

  According to the invention of claim 5, since the fuel tank is also used as the mounting member for the mount member, the number of parts is reduced, which is advantageous in terms of cost reduction and assembly.

  In addition, since the load acting on the bonnet (the total weight of the driver's seat, the weight of the operator sitting, and the bonnet's own weight) is transmitted from the bonnet to the fuel tank via the mount member, The fixing power of the fuel tank can be strengthened.

  According to the sixth aspect of the invention, the front frame is also used as the damper mounting member, which is advantageous in terms of reduction in the number of parts, cost reduction, and assembly.

1 is a schematic side view of a mini excavator according to an embodiment of the present invention. It is a perspective view which shows the bonnet support structure provided in the upper revolving body of the shovel. It is the same top view. It is a perspective view of a bonnet support structure alone. It is a schematic side view of the mini-excavator for demonstrating a prior art. FIG. 6 is a view corresponding to FIG. 5 in a state where a bonnet is opened.

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

  In the embodiment, a mini excavator is applied in accordance with the description of the background art.

In this embodiment,
(I) An upper swing body 22 is rotatably mounted on a crawler-type lower traveling body 21, and a boom 23, an arm 24, a bucket 25, and hydraulic cylinders (boom cylinder, (Arm cylinder, bucket cylinder) 26-28 work attachment 29 is mounted to constitute a mini excavator,
(Ii) An engine room 33 surrounded by left and right side panels (only one side is shown) 31, a bonnet 32, etc. and having an upper surface and a rear surface opened is provided at the rear portion of the upper frame 30 constituting the upper revolving structure 22. The point that equipment such as the beginning is housed in this engine room 33,
(Iii) The bonnet 32 is formed in an L shape that covers the upper surface side and the rear surface side of the engine room 33, and rotates around a bonnet shaft (hinge) 34 provided at the front end portion so that both openings on the upper surface and the rear surface are opened. Attached to the upper frame 30 in a state of opening and closing,
(Iv) A driver's seat 35 is provided on the hood 32, and the operation levers (not shown) provided on the left and right sides of the driver's seat 12 are operated with the operator O seated on the driver's seat 35 as shown. This is the same as the known mini excavator shown in FIGS.

  In the embodiment, the battery 36, the hydraulic oil tank 37, the left side of the engine room 33 (the direction as viewed from the operator O seated on the driver's seat 35. The case where the fuel tank 38 is arrange | positioned along with the front-back direction and the radiator 39 (all maintenance frequency is high) is arrange | positioned on the right side is illustrated.

  The bonnet support structure in the embodiment will be described.

  A front frame 40 and a support member 41 are provided as bonnet support means.

  The front frame 40 is formed as a gate-shaped frame structure composed of left and right front pillars 42 and 43 and a horizontal beam 44 horizontally spanned between the upper ends of the front pillars 42 and 43. Lower ends of both front pillars 42 and 43 are attached to the bottom surface of the upper frame 30 so as to substantially cross the engine room 33 at the front end portion.

  Since the bottom of the upper frame usually has a height difference (unevenness) depending on the part, the lengths of the front pillars 42 and 43 are set according to the unevenness, and the upper frame is appropriately set via a mounting seat (not shown). 30.

  The support member 41 is a rib formed by bending a pipe material (the illustrated round pipe material is preferable, but a square pipe material, a bar material, or a mold material), that is, the upper opening of the engine room 30 in the width direction. A vertical side 45 cut vertically at the center, a horizontal side 46 extending horizontally to the right side from the rear end of the vertical side 45 via a gentle radius, and a rear column 47 hanging from the tip of the horizontal side 46 The front end of the vertical side portion 45 is connected to the intermediate portion in the left-right direction of the cross beam 44 in the front frame 40 via the connecting brackets 48 and 49, while the lower end of the rear column 47 is attached to the bottom surface of the upper frame 30. ing.

  In addition, in order to reinforce the strength at the front end side of the vertical side portion, a mounting seat 50 protrudes leftward from the front end portion of the vertical side portion 45, and this mounting seat 50 is attached to the upper surface of the hydraulic oil tank 37.

  Thus, the overall shape of the bonnet support means including the front frame 40 and the support member 41 is formed in a side-view portal shape with a J-shape that is opposite to the left and right in a plan view.

  On the other hand, left and right side mounting members 51 and 52 that partially contact the lower surface of the bonnet 32 and receive a bonnet load are provided on both left and right sides of the support member 41 at the rear side of the engine room.

  Specifically, the left mount member 51 is attached to the upper end portion of the fuel tank 38, and the right mount member 52 is attached to the lateral side portion 46 of the support member 41.

  Accordingly, the bonnet 32 is directly supported at the front end portion by the front frame 40 and at the rear portion by the side mounting members 51 and 52.

  The support member 41 indirectly supports the bonnet load via the right mount member 52 and supports the front frame 40 from behind, and the front end side is also supported by the front frame 40 itself.

  As shown in FIGS. 2 to 4, a damper mounting seat 53 protrudes rearward from an intermediate portion of the horizontal beam 44 of the front frame 40, and a damper 54 (see FIG. 4) is attached to the damper mounting seat 53.

  In FIG. 4, 55 is a damper guide member for rotating and guiding the damper 54 according to opening and closing of the bonnet. One end side is attached to the front end portion of the vertical side portion 45 of the support member 41 and the other end side is attached to the damper 54. Yes.

  According to this configuration, the bonnet support means is configured by the front frame 40 provided at the front end of the engine room and the rib-shaped support members 32 that vertically cut the upper part of the engine room. There is no bonnet support structure in the open state.

  For this reason, the devices installed in the engine room 33, particularly the devices arranged on the left and right sides serving as maintenance ports (in the embodiment, the battery 36, the hydraulic oil tank 37, the fuel tank 38, and the radiator 39, which are frequently maintained) are arranged. Therefore, it becomes easy to access and maintenance including replacement of these becomes easy.

  Moreover, since it consists only of the front frame 40 which is a frame structure, and the rib-shaped support member 41, it becomes simple, light weight, low cost, and an assembly becomes easy.

  In addition, the front frame 40 and the support member 41 support each other, and the vertical side portion 45 of the support member 41 is high for the longitudinal load, and the front frame 40 and the horizontal side portion 46 are high for the torsional load. Since the structure exerts a drag, the bonnet support means as a whole has a sufficient strength, and a necessary bonnet support function can be ensured.

  In addition, since the mount members 51 and 52 that directly receive the bonnet load are provided on both the left and right sides of the vertical side portion 45, and also on the rear end portion where the bonnet support force becomes thin, the bonnet support strength is enhanced. A more stable bonnet support state can be secured.

  Further, since the fuel tank 38 is also used as an attachment member for the left mount member 51, the number of parts is reduced, which is advantageous in terms of cost reduction and assembly.

  In addition, the load acting on the bonnet 32 (the total weight of the driver's seat, the weight of the operator sitting, and the bonnet's own weight) is transmitted from the bonnet 32 to the fuel tank 38 via the left mount member 51 as a force for pressing it downward. Therefore, the fixing force of the fuel tank 38 can be strengthened by this pressing force.

  In other words, the mounting structure of the fuel tank 38 can be simplified by incorporating the pressing force into the tank fixing force.

  Furthermore, since the front frame 40 is also used as a mounting member for the damper 54, it is advantageous in terms of reduction in the number of parts, cost reduction, and assembly.

  Incidentally, as another embodiment, the horizontal side portion 46 of the support member 41 may extend from the rear end of the vertical side portion 45 to the left side instead of the right side as in the above embodiment.

  Further, the front frame 40 may be formed not in a gate shape but in a T shape in which the front pillar is suspended from the middle portion in the left-right direction of the horizontal beam 44 of the above embodiment, or a frame shape.

  Moreover, although this invention is suitable for a mini excavator, it can also be applied to other construction machines having the same mechanical configuration as this mini excavator.

DESCRIPTION OF SYMBOLS 21 Lower traveling body 22 Upper revolving body 30 Upper frame 32 Bonnet 33 Engine room 35 Driver's seat 36 Battery as equipment 37 Same hydraulic oil tank 38 Same fuel tank 39 Same radiator 40 Front frame 41 Support members 42, 43 Left and right of front frame Both side front pillars 44 Same horizontal beam 45 Vertical side part of support member 46 Same horizontal side part 47 Same rear pillar 48 Connecting metal fitting 51 connecting the vertical side part and the front frame 51 Left mounting member 52 Right mounting member 53 Damper mounting seat 54 Damper

Claims (6)

  The upper part of the upper frame of the upper swing body mounted on the lower traveling body is provided with an engine room having an upper surface and a rear surface opened, and a bonnet that rotates about the front side to open and close the opening of the engine room. In the construction machine provided with a driver's seat on the bonnet, as a bonnet support means for supporting the bonnet in a closed state, a front frame for supporting the front end portion of the bonnet over a certain length range in the bonnet width direction, A rib-shaped support member made of a pipe material or the like, the support member being vertically cut at the upper part of the engine room and having a front end coupled to a middle portion in the left-right direction of the front frame, and the vertical side A lateral side extending from the rear end of the part to either the left or right side, and a rear pillar hanging from the front end of the lateral side part and attached to the upper frame Construction machine, characterized in that it made the. The front frame is formed in a gate-shaped cross beam is bridged between the left right sides anterior column, construction machine according to claim 1, wherein the lower end of the both sides before pillars, characterized in that attached to the upper frame .   3. The mount member that partially contacts the lower surface of the bonnet and receives a load from above the bonnet is provided on both left and right sides of the vertical side portion of the support member. Construction machinery.   4. The construction machine according to claim 3, wherein the left and right mounting members are provided in contact with the rear lower surface of the bonnet.   5. The construction machine according to claim 3, wherein one of the two side mounting members is mounted on a fuel tank installed on one of the left and right sides of the engine room.   The construction machine according to any one of claims 1 to 5, wherein a damper that assists in opening and closing the bonnet is attached between the front frame and the bonnet.

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