Patent Application
20080014070
Embodiments of the present invention will be described with reference to
The embodiments are exemplified in a case where the present invention is applied to a hydraulic excavator. An upper rotating body 21 of the hydraulic excavator is shown in
A basic construction of the upper rotating body 21 is shown in
That is, the upper rotating body 21 is provided with an upper frame 22, and on the left side of the upper frame 22, is installed a cabin 23. On the inner side of the upper frame to the cabin 23 (on the middle part in the lateral direction), are provided a pair of left and right boom attachment frames 24. To the boom attachment frames 24, is attached a base end (boom foot) 25a of the boom 25 by a boom foot pin 26. It should be noted that the attachment frames 24 are omitted in
On a right side surface part of the upper frame 22, is provided a side cover 27, and on a part covering a front surface part and an upper surface part, is provided a front cover 28 respectively. In a device chamber 29 covered by both the covers 27 and 28, are installed various devices, while on the rear side of the device chamber 29, are laterally aligned a fuel tank 30 and a working oil tank 31.
The devices in the device chamber 29 are installed in a state that a pin insertion and removal space (no specific reference numeral) sufficient for inserting and removing the pin 26 is ensured around an insertion and removal line L of the boom foot pin 26. In the pin insertion and removal space, to the upper frame 22, is attached a bracket 32 serving as a support body for attaching both the covers 27 and 28.
In the bracket 32, as shown in
The front cover 28 is constructed as a cover also serving as steps, as provided with several up and down steps 28a for performing maintenance of parts from the upper surface side of the machine. An upper part of the front cover 28 is attached to and supported by the front cover attachment portion 34.
In a middle part of the bracket 32 in the height direction, is provided a pin guide 35 on the pin insertion and removal line L.
The pin guide 35 is formed in a horizontal and square tube shape having a section size enabling insertion of the boom foot pin 26 in the axial direction. When the pin is inserted and removed, the boom foot pin 26 is guided to the insertion and removal direction by the pin guide 35.
That is, the boom foot pin 26 is pulled out to the right side and inserted from the right side in a state that the side cover 27 is opened.
In this case, while pulled out from the attachment frames 24, the pin 26 is fitted into the pin guide 35 (refer to
By the supporting and guiding effect of the pin guide 35, the boom foot pin 26 is inserted and removed on the pin insertion and removal line L and there is no fear that the pin is inclined from the pin insertion and removal line L. Therefore, since there is no fear that, when the pin is inserted and removed, the pin 26 is brought into contact with surrounding structures such as hydraulic piping and dropped off, it is possible to surely preventing damage of the pin itself and the structures.
In the device chamber 29 covered by both the side cover 27 and the front cover 28, is formed the pin insertion and removal space, and in the bracket 32 provided in the pin insertion and removal space, are provided the pin guide 35 and the attachment portions 33 and 34 of both the side cover 27 and the front cover 28. In other words, the pin guide 35 is provided in the bracket 32 which is originally required as a structure for attaching the cover. Therefore, in comparison to a case where the pin guide 35 is independently provided, it is possible to simplify a construction within the device chamber 29 and to lower the cost.
In addition, it is possible to strengthen the bracket 32 by the pin guide 35 and enhance the strength as the structure for attaching the cover.
Further, in the present embodiment, focusing on a point that when the side cover 27 is opened, the inside of the device chamber 29 including the bracket 32 is opened to the outside, on the lower side of the pin guide 35 in the bracket 32, is disposed a tool box 36 so that various tools are taken in and out from the outside.
By this, the bracket 32 can be multi-functionalized and intensified, and the construction within the device chamber 29 can further be simplified.
(1) The above embodiment is exemplified in a case where the front cover 28 also serving as steps is attached to the part covering the front surface and the upper surface of the device chamber 29. However, a front cover only for covering without steps may be attached.
Further, a fuel supply unit provided with a fuel supply hose and a fuel supply pump for fueling the fuel tank 30 may be attached to the front cover attachment portion 34 in the above embodiment. In this case, the front cover 28 may be attached by overlapping an upper surface of the fuel supply unit, or attached to the front cover attachment portion separately provided in the bracket 32.
(2) In the above embodiment, the bracket 32 is provided with three parts including the pin guide 35, both the side cover and front cover attachment portions 33 and 34, and the tool box 36. However, only two of the three parts or one of the three parts may be provided. An attachment portion for attaching other equipment in addition to the three parts may be added.
Although the invention has been described with reference to the preferred embodiments in the attached figures, it is noted that equivalents may be employed and substitutions made herein without departing from the scope of the invention as recited in the claims.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2006-192056 | Jul 2006 | JP | national |
