JP2009006814A - Fuel tank of construction machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel tank of a construction machine which can be mounted even in a narrow space and capable of ensuring effective fuel even when the amount of remaining fuel becomes small and the fuel tank is inclined. <P>SOLUTION: Weirs 12 and 13 with their fore end sides being transversely bent in a hook shape are installed before and behind a suction port 11 formed in a center part of a tank body 10 in a flat shape to longitudinally partition the suction port 11. When the amount of fuel in a tank becomes small, and the tank is longitudinally inclined, the fuel of a small amount on the rear side or the front side flows into a fuel sump part 20 surrounded by the weirs 12, 13, and stored. A part of the stored fuel is ensured as effective fuel, the supply of the fuel is not tapped out even when the tank is inclined. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a fuel tank mounted on a construction machine such as a hydraulic excavator.

  The construction machine may perform not only the operation on a flat ground but also the operation on an inclined ground that takes a forward leaning posture or a backward leaning posture for a required time.

  The fuel tank mounted on the construction machine is held in a horizontal state when the construction machine is on a flat ground, but is tilted when the construction machine is on a sloping ground. Even in such a driving posture, the fuel in the fuel tank needs to be sucked out from the suction port and supplied to the engine.

  In particular, when a construction machine is operated with the above fuel tank mounted, if the fuel in the fuel tank becomes small and the fuel in the fuel tank is not supplied to the engine due to the aircraft leaning back and forth, the engine is stopped. Will wake up.

  Therefore, it is necessary to make sure that the amount of fuel in the fuel tank is small during operation of the construction machine and that the gas tank does not run out when the aircraft is tilted back and forth. Proposed.

  FIG. 3 shows an example of this. In an engine fuel tank 1 mounted on a traveling agricultural machine, the front side of the body of the fuel tank 1 is made deeper than the rear side to increase the volume on the front side. As the structure in which the suction port 3 of the supply oil pipe 2 to the engine and the return port 5 of the return oil pipe 4 are provided close to each other at the bottom, fuel can be stored in the deepened bottom on the front side of the fuel tank 1. It is a thing. Reference numeral 6 denotes a partition plate, and 7 denotes a gap provided between the lower end of the partition plate 6 and the tank bottom plate.

  As shown in FIG. 3, in the case where the bottom of the fuel tank 1 is recessed and deepened, fuel can be stored in the deepened tank bottom even if the airframe on which the fuel tank 1 is mounted tilts forward or backward. Therefore, even if the amount of fuel in the fuel tank 1 becomes small, it can be operated with the aircraft tilted forward and backward (see, for example, Patent Document 1).

  FIG. 4 shows another example. An opening is provided in the bottom surface of the fuel tank 8, and a protruding portion 8a having a depth dimension B larger than the opening dimension A is protruded downward in the opening. And the fuel is supplied to the engine from the suction port 9 provided on the lower surface of the projecting portion 8a.

  In the configuration shown in FIG. 4 above, when the vehicle body is in a horizontal state, even if the remaining amount of fuel in the tank 8 is reduced, the protrusion 8a provided at the bottom of the tank is filled with fuel. In addition, even if the fuel tank 8 is inclined on an inclined land, the outflow of fuel from the protruding portion 8a is small, and most of the fuel tank 8 remains in the protruding portion 8a (see, for example, Patent Document 2).

  In recent years, it has been considered that a separator for reducing the inflow and outflow of fuel is provided around the suction port provided in the fuel tank so as to increase the time until the fuel supply is disabled.

JP-A-7-76231 Japanese Utility Model Publication No. 5-56550

  However, what is described in Patent Document 1 is that the front side of the airframe of the fuel tank 1 is deeper than the rear side, so that a space necessary for the airframe side is necessary as a place for installing the fuel tank 1 and is narrow. Cannot be installed when attempting to install in a location.

  In the device described in Patent Document 2, the protrusion 8a is provided on the bottom surface of the fuel tank 8 with a depth dimension B larger than the opening dimension A, so that there is a space for providing the protrusion 8a. In addition to the necessity, when the tank height is limited, there is a problem that a space other than the protruding portion is wasted.

  In addition, if a separator is provided around the suction port so as to reduce the inflow and outflow of fuel, it is not possible to secure a certain amount of fuel simply by earning time until supply becomes impossible. Therefore, when the amount of fuel becomes small and the fuel tank tilts, the fuel is lost at the suction port and the supply of fuel is cut off.

  Therefore, the present invention solves the problems of the prior art, can be easily installed in a narrow space, can effectively use the limited space, and the amount of fuel in the fuel tank becomes small, so that the aircraft can be moved back and forth. An object of the present invention is to provide a fuel tank for a construction machine that can secure effective fuel around the suction port even if it is inclined.

  In order to solve the above problems, the present invention provides a fuel tank to be mounted on a construction machine, wherein the remaining amount of fuel is reduced on the bottom surface of the tank body that is flat and flat, and the tank body is moved back and forth. Surrounding the suction port with a fuel reservoir that can ensure a part of the fuel collected in the portion of the suction port provided in the tank body when tilted as an effective fuel that can be sucked from the suction port The configuration is as described above.

  Specifically, the fuel reservoir portion provided so as to surround the suction port is constituted by a weir of a required height installed so as to extend in the left-right direction before and after the suction port, and each of the weirs before and after the front end is a tank It is fixed symmetrically on the left and right side walls of the main body, the front ends are bent in opposite directions, the tank main body is divided into front and rear, and the front end of the bent portion of the front weir and the front weir A gap of the required size is formed between the side and between the front end of the bent portion of the rear weir and the rear side of the front weir, so that the remaining amount of fuel is reduced and the tank body is tilted back and forth. Then, the fuel that was on the rear side or the front side flows into the suction port portion from the one gap and is stored.

The fuel tank of the construction machine according to the present invention is a fuel tank mounted on the construction machine, and the tank body tilts back and forth with a small amount of remaining fuel on the bottom surface of the tank body that is flat and flat. A fuel reservoir that can ensure a part of the fuel stored in the portion of the suction port provided in the tank body as an effective fuel that can be sucked from the suction port so as to surround the suction port. Specifically, the fuel reservoir provided so as to surround the suction port is constituted by a weir with a required height installed so as to extend in the left-right direction before and after the suction port, The end is symmetrically fixed to the left and right side walls of the tank body, the leading ends are bent in opposite directions, the tank body is partitioned forward and backward, and the leading end of the bent portion of the front weir A gap of the required size is formed between the front side of the side weir and between the front end of the bent part of the rear side weir and the rear side of the front side weir to reduce the remaining amount of fuel. Since the fuel that is on the rear side or the front side when the main body is tilted back and forth flows into the suction port portion from the one gap, the following excellent effects can be obtained.
(1) Even if the aircraft leans and the tank tilts when the remaining amount of fuel is low, a part of the fuel stored in the fuel reservoir can be secured as effective fuel, Work can be done without being cut off.
(2) According to the above (1), even when the amount of fuel in the tank is small, effective fuel can always be ensured at the time of tilting, so that work in a temporarily tilted posture can be performed regardless of the remaining amount of fuel and the tilt angle. .
(3) Even if the tank is tilted back and forth, the fuel on either side of the front and rear passes through the gap between the front and rear weirs constituting the fuel reservoir, and the effective fuel can be secured.
(4) Since it is flat and flat without protruding the bottom surface, it can be mounted in a narrow space and the space can be used effectively.
(5) Since the shape is simple, it can be molded even in a resin tank.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  1 and 2 show an embodiment of the present invention. A fuel tank having the same capacity as a fuel tank mounted on a construction machine is used as a flat shape with a small vertical dimension. A tank body 10 having required dimensions in the front-rear direction X and the left-right direction Y is provided, and a suction port 11 is provided on the bottom surface at the center of the tank body 10 so that the upper end of the suction port 11 protrudes upward by a required dimension. .

  The weirs 12 and 13 having a bowl shape in plan view are opposed to each other in the front-rear direction at positions away from the position of the suction port 11 provided on the bottom surface of the central portion in the tank body 10 to the front side and the rear side. In this manner, the gaps 14 and 15 are arranged in parallel in the left-right direction so that the both dams 12 and 13 surround the suction port 11 and the fuel flows between the dams 12 and 13. The effective fuel 16a can be secured by the weirs 12 and 13 surrounding the suction port 11.

  More specifically, the required height (for example, 90 mm) is formed such that the front side is bent at a right angle or a substantially right angle to the front side and the rear side of the suction port 11 provided in the central portion of the tank body 10 so that the planar shape has a bowl shape. The weirs 12 and 13 of a certain height) are arranged so that the front ends face each other, that is, the front weir 12 has the bent portion 12a facing backward, and the rear weir 13 has the bent portion 13a facing forward. Thus, the fuel passages 18 and 19 are formed between the bent portions 12 a and 13 a of the weirs 12 and 13 and the side wall 17 of the tank body 10. Further, the weirs 12 and 13 located before and after the suction port 11 are both fixed to the inner surfaces of the left and right side walls 17 of the tank body 10 so as to partition the inside of the tank body 10 forward and backward. Between the rear side of the weir 12 and the tip of the bent portion 13a of the rear weir 13 and between the front side of the rear weir 13 and the tip of the bent portion 12a of the front weir 12 So that the portion of the suction port 11 becomes the fuel reservoir 20. As a result, when the tank body 10 is inclined forward, the fuel on the rear side of the tank body 10 passes through the gap 15 from the flow path 19 between the tip bent portion 13a of the weir 13 and the side wall 17 of the tank body 10. The fuel is stored in the fuel reservoir 20 between the weirs 12 and 13. On the other hand, when the tank body 10 is tilted backward, the fuel on the front side of the tank body 10 is in contact with the bent end 12 a of the weir 12. Part of the fuel 16 collected in the fuel reservoir 20 between the weirs 12 and 13 through the gap 14 from the flow path 18 between the tank body 10 and the side wall 17 and stored in the suction port 11 portion. The effective fuel 16a as shown in FIG. 2 can be secured.

  In FIG. 1, for convenience of explaining the configuration of the fuel tank of the construction machine according to the present invention, the top plate is omitted, but the flat top plate includes front and rear side walls 17 and front and rear side plates. The tank is joined to the upper end surfaces of the weirs 12 and 13 so that the inside of the tank is partitioned by the weirs 12 and 13. Further, although not shown, the fuel tank is provided with a fuel supply port.

  Since the fuel tank of the construction machine according to the present invention has the above-described configuration and has a flat shape, when the fuel tank of the present invention is mounted on the construction machine, it is limited to a limited space such as under the floor of the construction machine or in a narrow space. It can be easily installed and mounted, and effective use of a limited space can be achieved.

  In the case of a flat fuel tank, even if the fuel is filled in the tank, the depth of the fuel is so small. However, the flat fuel tank of the present invention is mounted on a construction machine. By driving, when the aircraft is inclined in a state where the amount of fuel in the fuel tank has become small, for example, tilted so as to be in a forward inclined posture, the fuel that was on the rear side of the tank body 10 in FIG. It flows down the flow path 19 between the front-end | tip bending part 13a of the weir 13 and the side wall 17 inner surface of the tank main body 10, and flows to the front side.

  When the airframe tilts forward, the remaining fuel that has flowed forward through the flow path 19 is blocked by the front weir 12 and at the same time, a gap between the front end of the bent portion of the rear weir 13 and the front weir 12 The fuel flows in the direction of the suction port 11 from 15 and is stored in the fuel reservoir 20.

  When the fuel reservoir 20 is full, it flows out of the gap 14 between the front end of the bent portion of the front weir 12 and the rear weir 13 and flows to the front side of the tank body 10. In this way, as the fuel tank with a small amount of fuel tilted forward in the forward leaning posture of the fuselage, a part of the remaining fuel on the rear side in the tank main body 10 is retained in the suction port 11. As shown in the example of the inclination in FIG. 2, when the fuel 16 is present above the upper end level of the suction port 11 due to the accumulation of the fuel in the portion, the fuel accumulated above the upper end level of the suction port 11 is reduced. A part can be secured as the effective fuel 16a.

  Thus, even if the fuel in the fuel tank becomes small during operation and the aircraft tilts forward in this state, the fuel remaining in the fuel reservoir 20 by the weirs 12 and 13 installed so as to surround the suction port 11 If the fuel is stored above the level of the upper end opening of the suction port 11, the effective fuel 16a can be secured as shown in FIG. It is possible to work in a temporarily inclined posture regardless of the remaining amount of fuel and the inclination angle.

  Incidentally, according to the fact that the present inventors have actually confirmed, the amount of fuel accumulated in the fuel reservoir 20 surrounded by the weirs 12 and 13 when the fuel tank is inclined forward by 5 degrees, that is, the suction port 11 When the amount of the accumulated fuel 16 up to the level of the upper end opening was 0.9 l and the amount of the effective fuel 16 a was 0.43 l, the construction machine could be operated for 2 minutes 30 seconds.

  Next, when the fuselage is further tilted forward, the inclination angle of the fuel tank is 10 degrees, the amount of fuel 16 stored in the fuel reservoir 20 is 1.1 l, and the amount of effective fuel 16 a is 0.57 l, It was possible to operate for 3 minutes.

  Further, when the airframe is tilted, the fuel tank tilt angle is 20 degrees, the amount of the fuel 16 stored in the fuel storage portion 20 is 1.6 l, and the amount of the effective fuel 16 a is 0.96 l, further above. A long 5-minute operation time was secured.

  Thus, it was confirmed that the greater the fuel tank tilt angle, the greater the amount of effective fuel, and accordingly the operating time can be lengthened.

  In the above-described embodiment, the fuel flow in the tank has been described with respect to the case where the fuel tank is tilted forward. However, when the fuel tank is tilted rearward in FIG. 1, that is, when tilted rearward, it is on the front side in the tank. The fuel flows rearward from the flow path 18 between the bent end 12 a of the weir 12 and the side wall 17 of the tank body 10, and flows into the fuel reservoir 20 surrounded by the weirs 12 and 13 from the gap 14. The fuel that has flowed in is partly reserved, and a part of the fuel is secured as effective fuel 16a. The surplus fuel flows to the rear of the front weir 12 through the gap 15, and then the front bent portion 13a of the rear weir 13 and the tank It flows to the rear side of the tank body 10 through the flow path 19 between the side wall 17 of the body 10.

  Since more fuel than the amount stored in the fuel reservoir 20 is stored, even if the amount of fuel becomes small and the fuel tank tilts, effective fuel can be secured, so that temporary work can always be performed. It will be possible.

  The fuel tank of the construction machine according to the present invention has a simple configuration in which there is no protrusion from the bottom surface and the bottom surface can be flat, and the two weirs 12 and 13 are provided inside, so that it can be applied to a resin tank. Is possible.

  Further, the weirs 12 and 13 provided on the front side and the rear side of the suction port 11 are exemplified as cases where the tip side is bent at a right angle or substantially right angle to form a bowl shape. 13a may be bent so as to draw a gentle arc.

  Further, when the fuel in the fuel tank becomes small and the aircraft tilts back and forth, if a part of the fuel stored in the suction port 11 can be secured as the effective fuel 16a, the fuel tank can be moved forward and backward. The positional relationship between the weirs 12 and 13 to be installed, the relationship between the position of the suction port 11 and the positions of the tips of the both weirs 12 and 13 (the positions of the gaps 14 and 15), etc. are arbitrary, and are not shown in FIG. It is good also as a structure.

  In addition, it goes without saying that various modifications can be made without departing from the scope of the present invention.

It is a perspective view showing an outline of an internal structure as one embodiment of a fuel tank of a construction machine of the present invention. It is sectional drawing for description which shows the state of the fuel stored in the part of a suction inlet, when a tank takes a forward leaning posture when the fuel in the fuel tank of the construction machine of this invention decreases. FIG. 5 is a cut-away side view showing an example of a conventional fuel tank that can suck fuel even when the fuel in the fuel tank becomes small and the tank is inclined. FIG. 4 is a side view showing another example of a conventional fuel tank that can suck fuel even when the fuel in the fuel tank becomes small and the tank is inclined as in FIG. 3.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Tank main body 11 Suction inlet 12 Weir 12a Bending part 13 Weir 13a Bending part 14 Crevice 15 Crevice 16 Fuel 16a Effective fuel 20 Fuel reservoir part

Claims (3)

  In a fuel tank to be mounted on a construction machine, the tank body is provided on the bottom surface of the tank body that has a flat bottom surface when the remaining amount of fuel is reduced and the tank body is tilted back and forth. It has a configuration in which a fuel reservoir portion is provided so as to surround the suction port so that a part of the fuel stored in the suction port portion can be secured as an effective fuel that can be sucked from the suction port. Fuel tank for construction machinery.   The fuel reservoir provided so as to surround the suction port is constituted by a weir with a required height installed so as to extend in the left-right direction before and after the suction port, and each of the weirs before and after the front end has left and right side walls of the tank body. 2. A fuel tank for a construction machine according to claim 1, wherein the front end side is bent in a direction opposite to each other, and the tank body is partitioned forward and backward.   Between the front end of the bent portion of the front weir and the front side surface of the rear weir and between the front end of the bent portion of the rear weir and the rear side surface of the front weir, 3. The fuel according to claim 1 or 2, wherein when the remaining amount of fuel is reduced and the tank body is tilted back and forth, the fuel on the rear side or the front side flows into the suction port portion from the one gap and is stored. Fuel tank for construction machinery.

Images