JP2007177501A - Operating fluid tank structure for construction machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enlarge the substantial capacity of an operating fluid tank 9 storing an operating fluid without providing a boom 6 with an air chamber. <P>SOLUTION: An extended space X for extending an auxiliary tank 16 is secured above the rear half of a fuel tank 10 so as not to interfere with the fuel tank 10. The auxiliary tank 16 is mounted to extend into the extended space X from a mounting space secured on the fuel tank side of the upper face plate rear half of the operating fluid tank 9 to increase the substantial capacity of the operating fluid tank 9. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention belongs to the technical field of hydraulic oil tank structures for construction machines such as hydraulic excavators.

In general, a construction machine such as a hydraulic excavator is provided with a hydraulic oil tank that stores hydraulic oil for operating a hydraulic actuator such as a hydraulic cylinder or a hydraulic motor. The hydraulic oil tank is supplied to the hydraulic actuator side. Since the amount of hydraulic oil is not constant, the oil level changes up and down. In order to adapt to such oil level changes, the hydraulic oil tank is provided with an air chamber on the upper side to absorb fluctuations. However, when the air chamber is secured on the upper side of the tank, there is a problem that the amount of hydraulic oil filled in the hydraulic oil tank is reduced accordingly.
Therefore, an air chamber is externally arranged on the boom, and the air chamber and the hydraulic oil tank are connected to each other via a communication pipe so that a large amount of hydraulic oil can be secured in the hydraulic oil tank. Has been attempted (for example, Patent Document 1).
Japanese Patent Laid-Open No. 10-227046

  By the way, if the air chamber is arranged externally to the boom, not only is there a possibility that the communication pipe repeatedly moves every time the boom swings, leading to fatigue damage. However, there is a problem that the present invention does not solve the problem.

The present invention has been created in view of the above circumstances and has been created for the purpose of solving these problems. The invention of claim 1 is a hydraulic oil in which hydraulic oil for operating a hydraulic actuator is stored. In a construction machine including a tank, a space that does not interfere with other members is secured around the hydraulic oil tank, and the hydraulic oil tank is provided with an auxiliary tank so as to extend into the space. This is a hydraulic oil tank structure for a construction machine.
A second aspect of the invention is the hydraulic oil tank structure for a construction machine according to the first aspect, wherein the auxiliary tank is attached to the upper surface of the hydraulic oil tank to form an air chamber.
A third aspect of the invention is the hydraulic oil tank structure for a construction machine according to the first aspect, wherein the auxiliary tank is attached to a side surface of the hydraulic oil tank and is an oil chamber or an air chamber.

By setting it as invention of Claim 1, a substantial capacity | capacitance becomes large by the auxiliary | assistant tank with which the hydraulic oil tank was attached, and it can increase hydraulic oil amount, ensuring an air chamber.
By setting it as invention of Claim 2 or 3, an auxiliary | assistant tank can be utilized as an air chamber or an oil chamber.

  Next, embodiments of the present invention will be described with reference to the drawings. In the figure, reference numeral 1 denotes a traveling machine body of a hydraulic excavator, and the traveling machine body 1 is configured by a lower traveling body 3 provided with a crawler type traveling device 2 and an upper revolving body 4 that is turnably provided. On the front half side of the gantry frame 5 constituting the upper swing body 4, the base end portion of the boom 6 is pivotally supported so as to be able to swing up and down, and is located at one side in the left-right direction across the boom 6. The cab 7 is disposed on the left side (in the present embodiment), the control valve 8 is on the front side, and the hydraulic oil tank 9 and the fuel tank 10 are on the rear side on the other side (right side in the present embodiment). Although the hydraulic oil tank 9 and the fuel tank 10 are arranged, the hydraulic oil tank 9 is adjacent to the other side in the left and right direction with respect to the boom 6, and the fuel tank 10 is further in the left and right direction with respect to the hydraulic oil tank 9. The arrangement configuration adjacent to the side, that is, the hydraulic oil tank 9 is configured such that the left and right sides are sandwiched between the boom 6 and the fuel tank 10. Further, on the rear half side of the gantry frame 5, the engine 11 is located behind the boom 6, and the member device 12 such as a radiator is located behind the cab 7, and the hydraulic oil tank 9 and the fuel tank 10. The main pumps 13 are respectively disposed in a state of being located rearward. A fuel supply port 10 a and a fuel gauge 10 b are provided on the upper surface of the front half of the fuel tank 10, so that the auxiliary tank 16, which will be described later, extends above the upper surface of the rear half of the fuel tank 10. An exit space X is secured.

  The hydraulic oil tank 9 has a rectangular shape that is long in the front-rear direction with the upper surface plate 9a positioned slightly above the upper surface of the fuel tank 10, but the upper half of the tank upper surface plate 9a has an upper end. A return filter (capsule filter) 14 is incorporated so that the portion protrudes upward, and a maintenance suction screen 15 is incorporated in the rear half of the return filter 14 in a state of being biased toward the left and right direction boom 6. As a result, a space Y for mounting an auxiliary tank 16, which will be described later, is secured in the fuel tank 10 side portion of the rear half of the fuel tank top plate 9a.

  In the hydraulic oil tank 9, an extension portion 9 b is formed at the rear half fuel tank 10 side portion of the upper surface plate 9 a so as to overlap the upper half portion upper surface of the fuel tank 10 from above. The auxiliary tank 16 is attached to the extension portion 9b so as to extend from the attachment space Y to the extension space X, and the attachment means is welded in this embodiment. The auxiliary tank 16 is connected to the hydraulic oil tank 9 through a communication hole 9c formed in the tank upper surface plate 9a so as to be positioned in the auxiliary tank 16. In addition, the auxiliary tank 16 is provided with an air breather (vent valve) 17 and a fuel filler port 18 on its upper surface.

  In the embodiment of the present invention configured as described above, the auxiliary tank 16 is attached to the hydraulic oil tank 9 to increase the substantial capacity of the hydraulic oil tank 9, thereby providing a sufficiently large oil chamber. Although the air chamber can be secured, the auxiliary tank 16 is attached by effectively using the extension space X that does not interfere with other members from the attachment space Y formed in the hydraulic oil tank 9. Can be used effectively.

  In the above embodiment, the auxiliary tank 16 is attached to the upper surface of the hydraulic oil tank 9, but the present invention is not limited to the above embodiment, as in the second embodiment shown in FIG. You may make it attach to the side surface of the hydraulic oil tank 9. FIG. That is, in this case, the upper space Z of the main pump 13 is effectively used as the extension space of the auxiliary tank 16, and the auxiliary tank 20 is further attached to the rear side surface 9d of the hydraulic oil tank 9. The tank 20 is configured such that the upper half is an air chamber and the lower half is an oil chamber. Further, although not shown, an auxiliary tank may be provided on the front side surface of the hydraulic oil tank 9, and the present invention extends to this space if there is a space that does not interfere with other members. Needless to say, one or a plurality of auxiliary tanks can be attached if necessary.

It is a left view of a hydraulic excavator. It is a principal part right view of a hydraulic shovel. It is a principal part top view of a hydraulic excavator. It is a perspective view of a hydraulic oil tank. The hydraulic oil tank is shown, wherein (A) is a plan view and (B) is a rear view. It is a principal part side view of the hydraulic shovel which shows other embodiment.

Explanation of symbols

9 Hydraulic oil tank 9a Top plate 10 Fuel tank 16 Auxiliary tank

Claims (3)

  In a construction machine including a hydraulic oil tank in which hydraulic oil for operating a hydraulic actuator is stored, a space that does not interfere with other members is secured around the hydraulic oil tank. A hydraulic oil tank structure for a construction machine, wherein an auxiliary tank is provided so as to extend into the space.   2. The hydraulic oil tank structure for a construction machine according to claim 1, wherein the auxiliary tank is attached to an upper surface of the hydraulic oil tank and is an air chamber.   2. The hydraulic oil tank structure for a construction machine according to claim 1, wherein the auxiliary tank is attached to a side surface of the hydraulic oil tank and is an oil chamber or an air chamber.

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