JP2014034851A - Tank of work machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tank of a work machine, which has a configuration in which accumulation of dust produced at a corner of a bottom surface of the tank of the work machine is reduced and labor and time necessary for cleaning can be reduced.SOLUTION: A return pipe 22 for making return oil flow back to a tank 1 is connected to a tank of a work machine, and the tank has an outflow part 1a which makes the oil in the tank 1 flow out, on the bottom of the tank 1. The tank of the work machine includes a discharge pipe 23 having an oil discharge hole 23a along a corner 1b of a bottom surface 1c in the tank 1. The tank of the work machine includes a connection pipe 24 for connecting the discharge pipe 23 to the return pipe 22. The return oil is discharged onto the bottom surface 1c of the tank from the discharge hole 23a of the discharge pipe 23 via the connection pipe 24 from the return pipe 22.

Description

  The present invention relates to a tank used in a working machine such as a hydraulic excavator and used as a fuel tank or a hydraulic oil tank.

  In a hydraulic excavator, a power unit is mounted on a turning frame constituting an upper turning body. The power unit includes an engine, a hydraulic pump driven by the engine, a fuel tank that stores fuel for the engine, a hydraulic oil tank that stores hydraulic oil that is discharged from the hydraulic pump and drives various actuators, and various cooling devices Etc. are configured.

  As shown schematically in FIG. 6, the tank disclosed in Patent Document 1 is provided with a box-shaped outflow portion 1a for oil outflowing on the bottom surface of the tank 1, and the inside of the outflow portion 1a. A filter 2 for removing dust contained in the oil is provided. Of the dust mixed in the oil flowing in from the return oil inlet 3 provided on the side of the tank 1, heavy dust is deposited on the bottom surface of the tank 1, and the deposited dust is applied to the filter 2 in the room 1 a. Flowed and captured.

  In the case of a large excavator, the capacity of the hydraulic oil tank or the fuel tank is large, and the filter 2 provided in the outflow portion 1a causes an increase in flow resistance due to trapped dust, and therefore needs to be replaced every predetermined operation time. . When the filter 2 is replaced, the lid 4 that closes the opening provided on the side surface of the tank 1 is opened, and an operator enters the tank 1 from the opening to replace the filter 2. When the filter 2 is replaced, the inner surface of the tank 1 is also cleaned.

Japanese Patent Laid-Open No. 11-036363

  However, as described above, the volume of the tank 1 is large, and the corner 1b on the bottom surface of the tank 1 is square, so that no oil flows at the bottom corner 1b in the tank 1. For this reason, dust does not flow from the tank 1 to the outflow part 1a but accumulates at the bottom corner 1b in the tank 1. When the amount of accumulated dust increases, cleaning becomes difficult. In particular, in the case of fuel tanks, biodiesel fuel has been frequently used in recent years, and sticky sludge has adhered to and accumulated on the bottom corner 1b of the tank 1, which makes cleaning more difficult and requires a lot of labor for cleaning. There is a problem that it takes time.

  In view of the above-described problems, an object of the present invention is to provide a working machine tank configured to reduce dust accumulation in the bottom corner of the working machine tank and reduce labor and time required for cleaning.

The tank of the working machine according to claim 1, wherein the return pipe for returning the return oil to the tank is connected, and the tank of the working machine has an outflow part for allowing the oil in the tank to flow out at the bottom of the tank.
A discharge pipe provided along a corner of the bottom surface in the tank, and having an oil discharge portion;
A connecting pipe for connecting the discharge pipe to the return pipe;
The return oil is discharged from the discharge portion of the discharge pipe onto the bottom surface of the tank through the connection pipe from the return pipe.

The hydraulic oil tank according to claim 2 is the working machine tank according to claim 1,
The discharge section includes a discharge hole provided obliquely downward in the discharge pipe, and is provided upward on the upper surface of the discharge pipe so as to prevent discharge flow from accumulating dust on the discharge pipe. A discharge hole to be generated is further provided.

The working machine tank according to claim 3 is the working machine tank according to claim 1 or 2,
The discharge pipe is provided over the entire corner of the bottom surface of the tank, and a plurality of connection pipes for connecting the discharge pipe to the return pipe are distributed.

  According to the first aspect of the present invention, the discharge pipe is provided along the corner of the bottom surface of the tank, and the return oil is discharged from the discharge portion provided on the discharge pipe onto the bottom surface of the tank to prevent the accumulation of dust on the bottom surface of the tank. As a result, the accumulation of dust at the corners of the bottom surface of the tank is reduced, and labor and time required for tank cleaning are reduced.

  According to the second aspect of the present invention, the discharge hole is provided with the discharge hole provided obliquely downward in the discharge pipe, and provided upward on the upper surface of the discharge pipe so as to prevent dust from accumulating on the discharge pipe. Therefore, not only the bottom surface of the tank but also dust can be prevented from accumulating on the discharge pipe, and the inside of the tank can be easily cleaned.

  According to the invention of claim 3, since the plurality of connecting pipes connected to the return pipe are arranged in a distributed manner, the oil can be uniformly discharged from the discharge portion of the discharge pipe over the entire circumference of the tank. Dust accumulation on the bottom corner of the tank can be prevented.

It is a side view which shows an example of the working machine to which the tank of this invention is applied. (A) is a perspective view which shows the outline of one Embodiment of the tank by this invention, (B) is a perspective view which expands and shows a part of discharge pipe shown to (A). (A) is side sectional drawing which shows the installation structure of the tank of this Embodiment, (B) is EE sectional drawing of (A). It is sectional drawing which shows the outflow of the oil from the discharge pipe of this Embodiment. (A) is side surface sectional drawing which shows the installation structure of the tank of other embodiment of this invention, (B) is FF sectional drawing of (A). It is a perspective view which shows the structure of the conventional tank.

  FIG. 1 is a side view showing an example of a working machine to which the tank of the present invention is applied. In FIG. 1, reference numeral 6 denotes a crawler type lower traveling body, and reference numeral 7 denotes an upper revolving body installed on the lower traveling body 6 via a revolving device 8. A driver's cab 9, a power unit 10, a counterweight 11, and the like are installed on the upper swing body 7, and a work front 13 is attached.

  The working front 13 includes a boom 15 attached to the upper swing body 7 by a boom cylinder 14 so as to be able to be raised and lowered, an arm 17 attached to the boom 15 so as to be rotatable by an arm cylinder 16, and a bucket cylinder 18 to the arm 17. A bucket 19 that is rotatably attached, and a level cylinder 20 that is provided between the boom 15 and the arm 17 for horizontally pushing the bucket 19 are provided.

  The power unit 10 includes an engine, a hydraulic pump driven by the engine, a fuel tank that stores engine fuel, a hydraulic oil tank that stores hydraulic oil discharged from the hydraulic pump, a cooling device such as a radiator, etc. (Not shown). The hydraulic pump supplies hydraulic oil to a traveling motor (not shown) of the lower traveling body 6, a turning motor (not shown) of the turning device 8, hydraulic cylinders 14, 16, 18, 19 of the working front 13. Is.

  2A is a schematic perspective view showing an embodiment of a tank according to the present invention, FIG. 2B is an enlarged perspective view showing a part of a discharge pipe used in the tank of the present embodiment in FIG. 3A is a side sectional view showing the installation structure of the tank 1, and FIG. 3B is an EE sectional view of FIG. 3A. The tank 1 is configured as a fuel tank or a hydraulic oil tank included in the power unit 10 shown in FIG. As shown in FIG. 3A, the tank 1 is installed on the turning frame 7 a of the upper turning body 7 via the frame 21.

  As shown in FIGS. 2 (A), 3 (A) and 3 (B), the tank 1 of the present embodiment is a box-shaped outflow portion 1a protruding downward on the bottom surface of the tank 1 as in the conventional example. The filter 2 is attached to the outflow portion 1a in a replaceable manner. The outflow portion 1a lowers the suction position of the filter 2 that sucks oil in the tank 1, thereby preventing air from being sucked even when the oil level in the tank 1 moves up and down or tilts. The main body portion (portion other than the outflow portion 1a) of the tank 1 is provided in order to reduce the height. Reference numeral 4 denotes a lid provided on the side surface of the tank 1 for closing an opening for entering and exiting a worker, which is detachably attached by a bolt (not shown).

  In FIG. 3A, reference numeral 22 denotes a return pipe that returns oil to the tank 1, and the return pipe 22 is connected to an inlet 3 provided in a side plate portion of the tank 1. Reference numeral 23 denotes an oil discharge pipe provided along a corner 1 b on the bottom surface inside the tank 1, and the discharge pipe 23 is connected to a return pipe 22 via a connection pipe 24.

  When the tank 1 is a hydraulic oil tank, the return pipe 22 is connected to the oil tank side port in the control valve to the hydraulic actuator. When the tank 1 is a fuel tank, the return pipe 22 is a surplus fuel return pipe that is returned as an excess from the fuel that is excessively supplied from the fuel tank 1 to the engine. Reference numeral 25 denotes a suction pipe connected to the outflow portion on the bottom surface of the tank. When the tank 1 is a hydraulic oil tank, it is connected to a suction port of a hydraulic pump. When the tank 1 is a fuel tank, it is connected to the fuel intake port of the engine.

  As shown in the cross-sectional view of FIG. 4, the discharge pipe 23 is formed with a discharge hole 23a obliquely downward for generating a discharge flow 26 for returning oil onto the tank bottom surface 1c. In the present embodiment, a discharge hole 23 b for generating a discharge flow 27 that prevents dust from accumulating on the discharge pipe 23 is also provided upward on the upper surface of the discharge pipe 23.

  In this configuration, when the tank 1 is a hydraulic oil tank, hydraulic actuators such as a traveling motor of the lower traveling body 6, a turning motor of the turning device 8, and hydraulic cylinders 14, 16, 18, 19 of the working front 13 are operated. At this time, the hydraulic oil in the tank 1 is sucked into the hydraulic pump from the suction pipe 25 and supplied to the hydraulic actuator, and the return oil is returned to the tank 1 through the return pipe 22 and discharged from the connection pipe 24 through the discharge pipe 23 to the discharge hole. 23a and 23b are discharged as indicated by arrows 26 and 27 in FIG.

  When the tank 1 is a fuel tank, fuel is supplied from the tank 1 to the engine through the suction pipe 25 by the operation of the engine, and excess fuel passes through the return pipe 22, the connection pipe 24, and the discharge pipe 23, and the discharge hole 23a. , 23b are discharged into the tank 1.

  Thus, in this embodiment, since the discharge pipe 23 having the discharge hole 23a is provided along the corner 1b of the bottom surface 1c of the tank 1, dust accumulation at the corner 1b of the bottom surface 1c is prevented, and the amount of accumulation is increased. Therefore, cleaning when replacing the filter 2 is facilitated. In particular, when biodiesel fuel is used, adhesion of sludge that is difficult to remove is prevented, so that it exhibits an important effect in reducing labor and time required for cleaning.

  Further, in the present embodiment, since the discharge hole 23b is provided on the upper surface of the discharge pipe 23 so as to prevent the accumulation of dust on the discharge pipe 23, not only the tank bottom surface 1c but also the discharge Accumulation of dust on the pipe 23 can also be prevented, and cleaning of the tank 1 is facilitated.

  FIG. 5 (A) is a side sectional view showing another embodiment of the tank according to the present invention, and FIG. 5 (B) is a sectional view taken along line FF in FIG. 5 (A). In the embodiment of FIG. 5, a plurality of connecting pipes 24A and 24B are dispersedly arranged and connected to the discharge pipe 23 arranged on the entire circumference of the corner 1b of the bottom surface 1c in the tank 1, and return oil is supplied. It is dispersed and flows into the discharge pipe 23 and discharged from the discharge holes 23a and 23b.

  As shown in FIG. 5, if a plurality of connecting pipes 24A and 24B connected to the return pipe 22 are provided and returned to the discharge pipe 23, the discharge holes 23a and 23b of the discharge pipe 23 are provided over the entire circumference of the tank 1. Thus, oil can be discharged uniformly, and the accumulation of dust on the corner 1b of the bottom surface 1c of the tank can be better prevented over the entire circumference.

  As shown in FIG. 5, as a structure in which the connection pipes 24 </ b> A and 24 </ b> B are dispersedly arranged, there is a structure in which the connection pipes 24 </ b> A and 24 </ b> B are branched from the return pipe 22. When the return pipe 22 is constituted by a plurality of pipes, a structure in which the plurality of return pipes 22 are connected to the individual connection pipes 24A and 24B, respectively, can be employed.

  When carrying out the present invention, the discharge pipe 23 does not necessarily have a circular cross-sectional shape, and may be rectangular, for example. The discharge pipe 23 may be placed on the bottom surface 1c of the tank 1, but the discharge pipe 23 may be fixed to the inner surface of the tank 1 by means such as welding as shown by a welding portion 28 in FIG. . Alternatively, the discharge pipe 23 may be lifted from the bottom surface 1 c and fixed to the inner surface of the tank 1 by welding or the like, and return oil may be discharged from the lower surface of the discharge pipe 23 toward the bottom surface 1 c of the tank 1.

  Further, the structure of the present invention can be applied to a tank in which the discharge pipe 23 is installed in a tank having a configuration in which the suction pipe 25 is connected to the bottom face 1 without being provided in the outflow portion 1a protruding downward from the bottom face of the tank 1. Further, the connecting pipes 24, 24 </ b> A, and 24 </ b> B may be configured to protrude from the discharge pipe 23 near the bottom of the tank 1 and connect to the return pipe 22.

  The tank of the present invention can be applied to various working machines other than hydraulic excavators. Moreover, when implementing this invention, a various change and addition are possible not only in the said embodiment but in the range which does not deviate from the summary of this invention.

1: tank, 1a: outflow portion, 1b: bottom corner, 1c: bottom surface, 2: filter, 3: inflow port, 4: lid, 6: lower traveling body, 7: upper turning body, 7a: turning frame, 8: Swivel device, 9: cab, 10: power unit, 11: counterweight, 13: front for work, 21: underframe, 22: return pipe, 23: discharge pipe, 23a, 23b: discharge hole, 24, 24A, 24B : Connection pipe, 25: Suction pipe, 28: Welded part

Claims (3)

In the tank of the working machine having a return pipe for returning the return oil to the tank and having an outflow part for discharging the oil in the tank to the bottom of the tank,
A discharge pipe provided along a corner of the bottom surface in the tank, and having an oil discharge portion;
A connecting pipe for connecting the discharge pipe to the return pipe;
A working machine tank characterized in that the return oil is discharged from the discharge portion of the discharge pipe onto the bottom surface of the tank through the connection pipe from the return pipe. In the tank of the working machine according to claim 1,
The discharge section includes a discharge hole provided obliquely downward in the discharge pipe, and is provided upward on the upper surface of the discharge pipe so as to prevent discharge flow from accumulating dust on the discharge pipe. A tank for a working machine, further comprising a discharge hole to be generated. In the tank of the working machine according to claim 1 or 2,
A tank for a working machine, wherein the discharge pipe is provided over the entire corner of the bottom surface of the tank, and a plurality of connection pipes connecting the discharge pipe to the return pipe are distributed.

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