JP5241482B2 - Opening and closing cover device for construction machinery - Google Patents

Description

  The present invention relates to an opening / closing cover device for a construction machine, and more particularly to an opening / closing cover device for a construction machine that can reduce the opening / closing operation force of an engine hood.

  2. Description of the Related Art Conventionally, an engine room for storing engine-related equipment such as an engine and a muffler (exhaust system equipment) is provided in a body (upper turning body) of this type of construction machine. The maintenance inspection opening formed on the upper surface of the engine room is covered with an engine hood so as to be opened and closed.

For example, as shown in FIGS. 5 to 7, apparatus devices such as an engine 2 and a muffler 3 are accommodated in the engine room 1. An engine hood 4 having an L-shaped vertical cross section is attached to the upper surface opening of the engine room 1 via a hinge member 6 so as to be opened and closed. A protective cover body 5 for covering exhaust system equipment such as the muffler 3 is provided below the engine hood 4, and the upper end portion of the cover body 5 is integrated with the lower surface of the engine hood 4. It is fixed. Thus, as illustrated in FIG. 7, when the engine hood 4 is opened or closed, the cover body 5 is also integrally rotated and opened or closed (see Patent Document 1).
Japanese Patent No. 3652076

  The upper surface opening of the engine room needs to be formed large in order to ensure workability for maintenance and inspection of the engine or the like. Therefore, the shape dimension of the engine hood is increased according to the size of the upper surface opening of the engine room. Moreover, since the cover body is integrally fixed inside the engine hood, the weight of the entire engine hood is further increased by the amount of the cover body. As a result, when opening / closing the engine hood, there is a problem that the opening / closing operation force of the engine hood is increased and a heavy burden is imposed on the operator.

  In order to reduce the opening / closing operation force of the engine hood, it is conceivable to provide urging means such as a torsion bar at a plurality of locations on the lower surface of the engine hood to elastically support the engine hood. However, in this case, it is necessary to secure a wide installation space on the lower surface of the engine hood. In addition, there is a problem that the number of parts increases and the structure becomes complicated.

  Therefore, there is a technical problem to be solved in order to reduce the opening / closing operation force of the engine hood without increasing the number of parts with a simple structure, and the present invention aims to solve this problem. To do.

The present invention has been proposed to achieve the above object, and the invention according to claim 1 is capable of opening and closing an upper surface opening of an engine room in which an exhaust system device such as an engine and a muffler is housed by an engine hood. while applying a cover in the cover system for a construction machine comprising a cover member for protecting the exhaust system device on the lower surface side of the engine hood, the engine hood and the upper and lower times independently of one another and the same direction and the cover body rotatably in provided, the rotation shaft of the cover member with respect to the axis of rotation of the engine hood is provided shifted in the parallel and opening side at the lower side, and the engine hood and the link mechanism and the cover body And opening / closing the construction machine, wherein the opening operation of the engine hood and the opening operation of the cover body can be performed in conjunction with each other. To provide a bar apparatus.

According to this configuration, the engine hood and the cover body can be turned up and down independently of each other, and are connected via the link mechanism. become. That is, when the engine hood is lifted and opened, the engine hood is rotated upward about its rotation axis to open, and the cover body is rotated upward about the rotation axis in conjunction with the operation. Thus, the opening operation is performed.

  The invention according to claim 2 provides the open / close cover device for a construction machine according to claim 1, wherein the link mechanism also serves as a support mechanism for supporting the cover body.

  According to this configuration, the link mechanism interposed between the engine hood and the cover body serves as a support mechanism for supporting the cover body with respect to the engine hood, and thus it is necessary to provide a separate support mechanism for the cover body. There is no.

  According to the first aspect of the present invention, when the engine hood is lifted, the cover body opens in conjunction with the opening operation of the engine hood. Therefore, as in the conventional example in which the engine hood and the cover body are integrated, the cover body The weight of the engine is not added to the engine hood as it is, and the opening / closing operation force is reduced, so that the burden on the operator can be greatly reduced.

  Since the invention according to claim 2 does not require a separate support mechanism for the cover body, in addition to the effect of the invention according to claim 1, the number of parts is reduced as compared with the system in which the urging means is newly provided. As a result, the configuration is simplified.

The present invention achieves the object of reducing the opening and closing operation force of the engine hood without increasing the number of parts with a simple structure, and therefore an upper surface opening of an engine room in which exhaust system equipment such as an engine and a muffler is housed. the addition to applying a cover to be opened and closed by the engine hood, the cover system for a construction machine comprising a cover member for protecting the exhaust system device on the lower surface side of the engine hood, to each other and said engine hood and the cover body independently and vertically pivotally mounted in the same direction, the rotation axis of the cover member with respect to the axis of rotation of the engine hood is provided shifted in the parallel and opening side at the lower side, and the engine hood and the The cover body is connected via a link mechanism so that the opening operation of the engine hood and the opening operation of the cover body can be performed in conjunction with each other. Was realized by the configuration was.

  A preferred embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a side view showing a hydraulic excavator as a construction machine according to the present embodiment, FIG. 2 is a cross-sectional view showing a closed state of an open / close cover device mounted on the hydraulic excavator, and FIG. 3 shows a link mechanism of the open / close cover device. FIG. 4 is a sectional view showing an open state of the opening / closing cover device.

  In FIG. 1, an upper swing body 13 is turnably mounted on a lower traveling body 12 of a hydraulic excavator 11, and a cab 14 is provided on one front side of the upper swing body 13. In addition, a boom 15 is connected to the front center portion of the upper swing body 13 so as to be able to be raised and lowered. Further, an arm 16 is pivotally attached to a tip portion of the boom 15 so as to be rotatable up and down. A bucket 17 is swingably attached.

  In addition, an engine room 18 having an upper opening for maintenance and inspection is provided behind the cab 14, and apparatus devices such as an engine 19 and a muffler (exhaust system device) 20 are accommodated in the engine room 18. . The upper surface opening of the engine room 18 is covered with an engine hood 21 so as to be opened and closed. Further, a protective cover body 22 that covers apparatus such as the muffler 20 is provided on the lower surface side (inner surface side) of the engine hood 21.

  The engine hood 21 is formed in an L-shaped vertical section, and the left end portion of the horizontal plane portion of the engine hood 21 is attached to the horizontal rotation shaft 23 so as to be vertically rotatable. Similarly, the cover body 22 disposed below the engine hood 21 is also formed in an L-shaped longitudinal section, and the horizontal plane left end of the cover body 22 is attached to the horizontal rotation shaft 24 so as to be vertically rotatable. The horizontal rotation shafts 23 and 24 are provided in the vicinity of the upper surface opening in the engine room 18.

  The horizontal rotation shaft 24 on the cover body 22 side is disposed near the lower side of the horizontal rotation shaft 23 on the engine hood 21 side (near the lower right side in FIG. 2), and is parallel to the horizontal rotation shaft 23. It is provided as follows. Further, the horizontal surface portion of the cover body 22 is disposed substantially parallel to the horizontal surface portion of the engine hood 21.

  The engine hood 21 and the cover body 22 are connected via a link mechanism L. That is, as illustrated in FIG. 3, a bracket 25 is fixed to a substantially central portion of the lower surface of the horizontal surface portion of the engine hood 21, and an upper end portion of a link 26 is connected to the bracket 25 via a connecting pin 27. It is pivotally attached so that it can rotate up and down.

  Similarly to the above, a bracket 28 is fixed to a substantially central portion on the upper surface of the horizontal surface portion of the cover body 22, and an upper end portion of the link 26 is pivotally attached to the bracket 28 via a connecting pin 30 so as to be vertically rotatable. Yes.

  Therefore, the engine hood 21 and the cover body 22 are connected so as to independently rotate up and down around the horizontal rotation shafts 23 and 24, respectively. Therefore, since the opening operation of the engine hood 21 and the opening operation of the cover body 22 can be performed independently of each other, the opening and closing of the engine hood 21 and the opening and closing of the cover body 22 can be operated in conjunction with each other by the link 26.

  Next, the opening / closing operation of the opening / closing cover apparatus according to the present embodiment will be described. When the engine hood 21 and the cover body 22 are opened, the engine hood 21 and the cover body 22 are pivotally connected to each other via the link 26. Therefore, the cover body 22 is interlocked with the opening operation of the engine hood 21. Opens.

  Now, when the engine hood 21 is lifted and opened from the state shown in FIG. 2 where the engine hood 21 is closed, the engine hood 21 rotates upward about the horizontal rotation shaft 23 and opens.

  In conjunction with the opening operation of the engine hood 21, the cover body 22 rotates upward about the horizontal rotation shaft 24 and opens. FIG. 4 shows a state where the engine hood 21 and the cover body 22 are opened.

  As described above, according to the present invention, the engine hood 21 and the cover body 22 are pivotally connected via the link 26, and are attached to the horizontal rotation shafts 23 and 24 so as to be vertically rotatable. The cover body 22 opens in conjunction with the opening operation of the engine hood 21.

  Thus, when the engine hood 21 and the cover body 22 are opened, only the weight equivalent to the weight of the cover body 22 is added by lifting only the engine hood 21 and performing the opening operation. Since the lifting force (opening operation force) of the engine hood 21 is reduced, the labor of the operator is significantly reduced.

  The link 26 also serves as a stay member (support mechanism) that supports the cover body 22 with respect to the engine hood 21. Therefore, the link 26 can be manufactured using an existing stay member. Thus, the manufacturing cost can be reduced without increasing the number of parts, and the structure is simplified and a large installation space is not required.

  It should be noted that the present invention can be variously modified without departing from the spirit of the present invention, and the present invention naturally extends to the modified ones.

The side view which shows one Example of this invention and shows the hydraulic shovel as a construction machine. Sectional drawing which shows the closed state of the opening / closing cover apparatus which concerns on this invention. Detailed view showing a link mechanism of the opening and closing cover device according to the present invention. Sectional drawing which shows the open state of the opening / closing cover apparatus which concerns on this invention. The rear view of the opening-and-closing cover apparatus installed in the engine room which shows a prior art example. The expansion side view at the time of closure of the opening / closing cover apparatus of FIG. The expansion side view at the time of opening of the opening / closing cover apparatus of FIG.

Explanation of symbols

11 Excavator (Construction machine)
13 Upper revolving body 18 Engine room 19 Engine 20 Muffler (exhaust system equipment)
21 Engine hood 22 Cover body 23 Horizontal rotation shaft 24 Horizontal rotation shaft 26 Link (link mechanism L)
27 connecting pin 30 connecting pin

Claims (2)

An upper opening of an engine room in which exhaust system equipment such as an engine and a muffler is housed is covered with an engine hood so that the engine hood can be opened and closed. In the opening and closing cover device for construction machinery,
The engine hood and independently and vertically pivotally mounted in the same direction and the cover member, provided the axis of rotation of the cover member with respect to the rotational axis of the engine hood is shifted and the opening side parallel to the lower side is and and said engine hood and said cover member are connected via a link mechanism, the construction which is characterized by being configured so as to enable to interlock the opening operation of the opening operation and the cover body of the engine hood Opening and closing cover device of the machine. 2. The opening / closing cover apparatus for a construction machine according to claim 1, wherein the link mechanism also serves as a support mechanism for supporting the cover body.

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