JP5704034B2 - Fuel supply device for construction machine and method for assembling the same - Google Patents

Description

  The present invention relates to a fuel supply device for supplying fuel to an engine and a method for assembling the same in a construction machine such as an excavator.

  The background art will be described using an excavator as an example.

  As shown in FIG. 5, the excavator has an upper revolving unit 2 mounted on a lower traveling unit 1 so as to be rotatable, and various facilities and equipment including a cabin 4 are mounted on an upper frame 3 serving as a base of the upper revolving unit 2. At the same time, a work attachment (excavation attachment) 5 is attached to the front portion of the frame 3.

  In this specification, the position of the cabin 4 is defined as the left front portion of the upper swing body 2 (upper frame 3), and the “front-rear” and “left-right” directions are referred to.

  Further, for simplification of the drawings and description, detailed illustration and description of each part of the upper frame not directly related to the present invention are omitted.

  An engine room 6 is provided at the rear of the upper frame 3, and an engine 7 is accommodated in the engine room 6.

  5 and 6, reference numeral 8 denotes a counterweight provided at the rear end portion of the upper frame.

  FIG. 6 is a plan view schematically showing the arrangement of the engine 7 in the upper frame 3 and the fuel supply device with respect to the engine 7.

  A fuel tank 9 for storing fuel of the engine 7 is provided in an equipment space S formed on the right side of the engine room 6 in the upper frame 3. The engine 7 and the fuel tank 9 are connected to each other by a fuel line 10. A supply device is configured.

  The fuel line 10 is a kind of fuel filter in order from the fuel tank 9 side, a fuel pre-filter 11 that removes impurities in the fuel, and a pump that pushes fuel toward the engine 7 with the help of the fuel injection pump of the engine 7. 12, a fuel main filter 13 which is another kind of fuel filter and finally filters the fuel (hereinafter, these may be collectively referred to as fuel system equipment), and equipment piping for connecting adjacent equipment to each other 14, a tank pipe 15 that connects the fuel pre-filter 11 to the fuel tank 9, and an engine pipe 16 that connects the fuel main filter 13 to the engine 7.

  A fuel return pipe 17 for returning surplus fuel from the engine 7 to the fuel tank 9 is provided between the fuel tank 9 and the engine 7.

  In the conventional fuel supply apparatus, each fuel system device 11 to 13 is attached to the airframe (upper frame 3, guard member forming the device space S, etc.) independently of each other by separate brackets (not shown). .

  As a related technique, Patent Document 1 discloses a technique for attaching a fuel filter and an engine oil filter to a fuel tank. However, in this technique as well, both filters are provided in the same manner as in the conventional fuel system equipment mounting structure. It is attached to the fuel tank via a separate bracket (one hinge).

JP 2008-121292 A

  According to the prior art, brackets must be manufactured for each of the fuel system devices 11 to 13 and must be dispersed and assembled in a limited space called the device space S. This increases the component cost and assembly cost of the entire fuel line. There was a problem that the efficiency of the assembly work was poor and the assembly time was long.

Accordingly, the present invention provides a fuel supply device for a construction machine and an assembling method thereof that can reduce the cost required for assembling fuel system equipment and can improve the efficiency and time of assembly work of the entire fuel line. It is.

As means for solving the above problems, in the fuel supply device for construction machinery according to the present invention (Claims 1 to 4 ), an engine and a fuel tank for storing fuel of the engine are connected by a fuel line, and the fuel line is In the fuel supply apparatus for a construction machine including a plurality of fuel system devices including a fuel filter, a hydraulic oil tank is disposed between the engine and the fuel tank, and a bent bracket having at least two surfaces is provided. has, a bracket, in which attached collected across at least two surfaces of said hydraulic oil tank in a state mounted separately above the fuel system device on each side.

According to this configuration, a plurality of fuel system devices constituting the fuel line are attached to one bracket, and the bracket is attached to the hydraulic oil tank. By being able to be assembled in the hydraulic oil tank, it is possible to reduce both the component cost and the assembly cost for assembling the fuel system equipment, and it is possible to improve the assembly work efficiency of the entire fuel line and shorten the time.

Further, since the fuel system devices are separately mounted on the respective surfaces of the bracket, each device can be mounted on the bracket with an appropriate distance as compared with the case where the fuel system devices are mounted densely on one surface. For this reason, the assembly work of the fuel line including the piping work between the devices and the subsequent maintenance work are facilitated.

Furthermore, paying attention to the fact that the hydraulic oil tank is usually arranged in the vicinity of the fuel tank, the hydraulic oil tank is arranged between the fuel tank and the engine and the outer surface thereof is used as a bracket mounting portion. Further, it is possible to realize a further cost reduction by omitting the dedicated bracket mounting portion, and it is possible to mount the bracket stably using the sufficient strength originally provided in the hydraulic oil tank.

In this case, a device subassembly is configured by attaching the plurality of fuel system devices to the bracket in a state where adjacent ones are connected to each other by device piping, and the device subassembly is attached to the hydraulic oil tank by the bracket. It is desirable to assemble (claim 2).

A corresponding assembly method according to the present invention is such that an engine and a fuel tank for storing fuel of the engine are connected by a fuel line, and the fuel line includes a plurality of fuel system devices including a fuel filter and a pump. In a method of assembling a fuel supply device for a machine, a hydraulic oil tank is disposed between the engine and the fuel tank, and a bent bracket having at least two surfaces is provided, and the plurality of fuel system devices are A device subassembly is assembled by attaching the adjacent devices to the bracket in a state where they are connected to each other by device piping. When the machine is assembled, the device subassembly is assembled to the hydraulic oil tank by the bracket, and the device subassembly is assembled. One end of the tank is connected to the fuel tank by tank piping, and the other end is connected to the engine piping. Is intended to assemble the fuel line and connected to the engine (claim 5).

According to the second and fifth aspects of the present invention, the fuel system equipment and equipment piping can be assembled at a place different from the assembly line of the machine, and the procedure for assembling the fuel system equipment and equipment piping on the machine body can be taken. The work efficiency and cost of line assembly can be further improved.

In the present invention, the upper Symbol bracket attaching removably to the outer surface of the hydraulic oil tank preferable (claim 3).

In the present invention is found, in the bracket, to provide a fuel receiving portion for receiving fuel spilled from the fuel filter is desirable (claim 4).

  In this way, there is no risk that fuel spilled during maintenance such as filter replacement will fall on the equipment below (especially electrical equipment) and cause trouble.

  According to the present invention, it is possible to reduce the cost required for assembling the fuel system equipment, and it is possible to improve the efficiency of assembly work for the entire fuel line and shorten the time.

1 is a perspective view of an upper frame provided with a fuel supply device according to an embodiment of the present invention. FIG. 2 is an enlarged view of the device subassembly in FIG. 1. FIG. It is a perspective view before the assembly of an apparatus subassembly. 1 is a schematic side view of an excavator to which the present invention is applied. It is a typical top view of the upper frame which shows the system structure of the conventional fuel supply apparatus.

  An embodiment of the present invention will be described with reference to FIGS.

  The embodiment is applied to an excavator.

  In the embodiment, the following points are the same as the prior art shown in FIGS.

  (i) The engine 7 is accommodated in the engine room 6 formed in the rear part of the upper frame 3 of the upper swing body.

  (ii) The fuel tank 9 for storing the fuel of the engine 7 is provided in the equipment space S provided on the upper right side of the engine room in the upper frame 3.

  (iii) The fuel supply device is configured by connecting the engine 7 and the fuel tank 9 by a fuel line 20 (reference numeral only in FIG. 1).

  (iv) The fuel line 20 includes, in order from the fuel tank 9 side, a fuel pre-filter 21 that removes impurities in the fuel, a pump 22 that pushes fuel toward the engine 7 with the help of the fuel injection pump of the engine 7, and finally the fuel Main filter 23 (hereinafter, collectively referred to as a fuel system device), device piping 24 for connecting adjacent devices, and tank piping for connecting fuel prefilter 21 to fuel tank 9 25 and an engine pipe 26 that connects the fuel main filter 23 to the engine 7.

  (v) Fuel supply by connecting one end side (fuel pre-filter 21) of the fuel line 20 to the fuel tank 9 via a tank pipe 25 and the other end side (fuel main filter 23) to the engine 7 via an engine pipe 26. The point at which the device is constructed.

  (vi) A fuel return pipe (corresponding to the fuel return pipe 17 in FIG. 6, not shown) for returning surplus fuel of the engine 7 to the fuel tank 9 is provided between the fuel tank 9 and the engine 7.

  In the embodiment, a hydraulic oil tank 28 as a pressure oil supply source of the hydraulic actuator is provided between the engine 7 and the fuel tank 9, that is, behind the fuel tank 9 in the equipment space S. Each fuel system device 21 to 23 is attached through one bracket 29.

  This point will be described in detail.

  As shown in detail in FIGS. 2 to 4, the bracket 29 is an L-shaped bent plate including a side surface mounting portion 30 corresponding to the right side surface of the hydraulic oil tank 28 and a rear surface mounting portion 31 corresponding to the rear surface of the tank. The fuel receiving portion 32 is formed in a horizontal bowl shape at the lower end of the side surface mounting portion 30.

  2 to 4, reference numeral 32 a denotes a fuel discharge hole provided in the fuel receiving portion 32.

  Prior to the assembly of the machine, the fuel system devices 21 to 23 are separately attached to the attachment portions 30 and 31 of the bracket 29 at a place different from the machine assembly line.

  In other words, the fuel pre-filter 21 and the pump 22 are attached to the side surface attaching portion 30 separately in the vertical direction, while the fuel main filter 23 is attached to the rear surface attaching portion 31.

  After the device is attached to the bracket 29 (may be before the attachment), the adjacent devices (the fuel pre-filter 21 and the pump 22, and the pump 22 and the fuel main filter 23 are connected by the device pipe 24, respectively.

  Thus, the device subassembly A is assembled by attaching the fuel system devices 21 to 23 to the bracket 29 in a state where the adjacent devices are connected by the device piping 24.

  Each fuel system device 21 to 23 is attached to the bracket 29 directly or indirectly via an appropriate attachment fitting. 2 to 4, reference numeral 33 denotes a mounting bracket for the fuel pre-filter 21 as an example of indirect mounting.

  The tank pipe 25 and the engine pipe 26 may be connected to the fuel pre-filter 21 and the fuel main filter 23 at this stage, or may be attached at the time of machine assembly.

  The equipment subassembly A is carried into the machine assembly line and assembled by the bracket 29 across the right side surface 28a and the rear side 28b of the hydraulic oil tank 28 as a part of the machine body.

  2 to 4, for example, the bracket 29 is bolted to a plurality of bosses 34 projecting from the right side surface and the rear surface of the hydraulic oil tank 28 by welding or the like. Removably attached to.

  At this time, one end side (fuel pre-filter 21) of the device subassembly A is connected to the fuel tank 9, and the other end side (fuel main filter 23) is connected to the engine 7 by the tank pipe 25 and the engine pipe 26, respectively. Line 20 is assembled.

  A fuel return pipe (not shown) is routed between the engine 7 and the fuel tank 9 at this stage.

  In this way, a plurality of fuel system devices 21 to 23 constituting the fuel line 20 are attached to one bracket 29, and this bracket 29 is attached to the fuselage (hydraulic oil tank 28). In addition, since the fuel system devices 21 to 23 can be assembled together at a time, the parts cost and assembly cost for assembly of the fuel system devices 21 to 23 can be reduced, and the assembly work efficiency of the entire fuel line 20 can be improved. Time reduction can be realized.

  Moreover, according to the embodiment, the following effects can be obtained.

  (I) Each fuel system device 21 to 23 is attached to a bracket 29 in a state where adjacent devices are connected to each other by a device pipe 24 to form a device subassembly A. Since the fuel system equipments 21 to 23 and the equipment piping 24 are assembled at a place different from the assembly line of the machine and the procedure of assembling them to the fuselage on the assembly line can be taken. The work efficiency and cost of assembling the fuel line 20 can be further improved.

  (II) The hydraulic oil tank 28 that is originally arranged in the vicinity of the fuel tank 9 is arranged in the middle of the path connecting the fuel tank 9 and the engine 7, and the outer surfaces (the right side surface 28a and the rear surface 28b) are used as bracket mounting portions. Since the structure is used, it is possible to reduce the cost by omitting the dedicated bracket mounting portion, and to mount the bracket 29 stably using the sufficient strength that the hydraulic oil tank 28 originally has. Can do.

  (III) Since the bracket 29 is formed into a bent shape having a side surface mounting portion 30 and a rear surface mounting portion 31, and the fuel system devices 21 to 23 are mounted separately on both surfaces 30, 31, each fuel system device 21 As compared with the case where ˜23 are mounted densely on one surface, each device 21-23 can be attached to the bracket 29 with an appropriate distance as shown in the figure.

  For this reason, the assembly work of the fuel line 20 including the piping work between devices and the subsequent maintenance work are facilitated.

  (IV) Since the bracket 29 is mounted across two surfaces (the right side surface 28a and the rear surface 28b) of the hydraulic oil tank 28, it is further advantageous in terms of stabilizing the bracket mounting state.

  (V) Since the bracket 29 is provided with a fuel receiving portion 32 for receiving fuel spilled from the fuel pre-filter 21, fuel spilled during maintenance such as filter replacement falls on equipment below (especially electrical equipment) and causes trouble. The risk of causing is lost.

  In addition, it is desirable to provide the fuel discharge hole 32a at a position that is out of the lower apparatus and does not cause a problem even if the received fuel is discharged.

  Alternatively, a configuration may be adopted in which a discharge pipe is connected to the fuel discharge hole 32a and the fuel is discharged outside the machine through the discharge pipe.

Other embodiments
(1) The bracket 29 may be formed in an inverted L shape having an upper surface mounting portion and mounted across the left and right side surfaces or the front surface and the upper surface of the hydraulic oil tank 28.

Further, the bracket 29 may be formed into a three-surface bent shape and mounted across the three surfaces of the hydraulic oil tank 28 (for example, the left and right side surfaces and the rear surface or the front surface, or the left and right side surfaces and the front and rear one side surface and the upper surface) .

(2) Various combinations of fuel system devices can be changed.

  For example, the pump 22 or one of the fuel pre-filter 21 and the fuel main filter 23 may be omitted.

  Further, a water separator may be used instead of or in addition to the fuel prefilter 21.

( 3 ) The fuel receiving portion 32 may be provided not below the side surface attaching portion 30 (below the fuel prefilter 21) but below the rear surface attaching portion 31 (below the fuel main filter 23). Or you may provide in both.

( 4 ) The present invention is not limited to the shovel, and can be applied to other construction machines configured with the shovel as a base, and construction machines including a fuel supply device similar to the shovel.

A Equipment sub-assembly 3 Upper frame constituting the machine body 7 Engine 9 Fuel tank 20 Fuel line 21 Fuel pre-filter 22 as fuel system equipment Same as pump 23 Fuel main filter 24 Equipment piping 25 Tank piping 26 Engine piping 28 Hydraulic oil tank 28a as a part Right side 28b of hydraulic oil tank Same as above, rear surface 29 Bracket 30 Side surface mounting portion of bracket 31 Rear surface mounting portion 32 Fuel receiving portion

Claims (5)

An engine, a fuel tank for storing fuel for the engine are connected by a fuel line, the fuel line, the fuel supply system for a construction machine having a plurality of fuel system equipment including fuel filter, the engine and the fuel tank The hydraulic oil tank is disposed between the bracket and a bent bracket having at least two surfaces, and the bracket is attached to each of the surfaces with the fuel system equipment separately attached to at least the hydraulic oil tank. the fuel supply system for a construction machine, characterized in that attached taken across the two surfaces. A device subassembly is constructed by attaching the plurality of fuel system devices to the bracket in a state where adjacent ones are connected by device piping, and the device subassembly is assembled to the hydraulic oil tank by the bracket. The fuel supply device for a construction machine according to claim 1. On SL bracket fuel supply system for a construction machine according to claim 1 or 2, wherein the attached detachably to the outer surface of the hydraulic oil tank. To the bracket, a construction machine of the fuel supply device according to any one of claims 1 to 3, wherein the digits set the fuel receiving portion for receiving fuel spilled from the fuel filter. An engine and a fuel tank for storing fuel of the engine are connected by a fuel line, and the fuel line is a method for assembling a fuel supply device for a construction machine including a plurality of fuel system devices including a fuel filter and a pump. While the hydraulic oil tank is disposed between the engine and the fuel tank, it has a bent bracket having at least two surfaces, and the plurality of fuel system devices are connected to each other by device piping. Assembling the equipment sub-assembly in the state, the equipment sub-assembly is assembled to the hydraulic oil tank by the bracket at the time of assembly of the machine, and one end of the equipment sub-assembly is attached to the fuel tank by a tank pipe. Connect the other end to the engine above by engine piping. Method of assembling a construction machine of the fuel supply system you characterized by assembling the fuel line.

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