JP2011111791A - Fuel supply device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel supply device operating without causing wear, damage or the like of a fuel pipe even when a pipe mounting member moves in the vertical direction and causing interfere with the other member arranged around a fuel tank. <P>SOLUTION: This fuel supply device is constituted by connecting the fuel pipe 11 with the fuel tank 10 installed in an upper revolving structure 2, extending it downward along a side wall part 10a of the fuel tank 10, connecting a turning arm 13 with the upper revolving structure 2 through a hinge 14 to turn in the vertical direction, and attaching a tip part of the fuel pipe 11 to the turning arm 13. Both ends of an inclined face part 20a are bent and formed in the side wall part 10a of the fuel tank 10 to become a stopper wall part 20b and a fuel gathering wall part 20c, respectively. When the turning arm 13 is turned and displaced from a fuel supply position to a storage position, the fuel pipe 11 is guided into a bent part between the inclined face part 20a of an excess length part holding member 20 and the stopper wall part 20b. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a fuel supply device for supplying fuel to an engine in a construction machine such as a hydraulic excavator driven by an engine, and particularly to a high place such as an upper swing body of a large construction machine. The present invention relates to a fuel supply device that can supply fuel to the fuel tank from the ground.

  A construction machine such as a hydraulic excavator using an engine as a drive source includes a fuel tank for supplying fuel to the engine. A fuel pipe for supplying fuel is connected to the fuel tank, and the fuel pipe is used as a fuel supply source. Is detachably connected. The hydraulic excavator is composed of a lower traveling body and an upper swing body, and the fuel tank is installed on the upper swing body.

  By the way, as disclosed in Patent Document 1, in a large hydraulic excavator operating in an open pit mine or the like, the height of the lower traveling body is 2 m or more, and the height of the upper rotating body on which the fuel tank is installed is high. The position is further higher than that. A fuel supply port is provided on the upper surface of the fuel tank, but in a large hydraulic excavator, a fuel pipe is always connected to the supply port, and when supplying fuel, the fuel pipe is connected to a fuel supply source, At other times, the fuel pipe is set to the storage position. For this purpose, a pipe attachment member that rotates in the vertical direction is provided, and a fuel pipe connected to the fuel tank is attached to the pipe attachment member. For this purpose, the upper turning body is provided with a turning center consisting of a hinge, a turning shaft, etc. as a turning center, a pipe mounting member is connected to the turning center, and the other end of the fuel pipe is connected to the pipe mounting member. It is set as the structure which extends and attaches the front-end | tip part of this fuel piping.

  At all times, the pipe mounting member is in a substantially horizontal state and is arranged along the lower surface of the upper swing body so that the fuel pipe is not exposed to the outside. This position is the storage position of the pipe mounting member. When fuel is supplied to the fuel tank, the fuel pipe can be lowered by turning the pipe mounting member downward from the retracted position, and can be connected to the fuel supply source side pipe by manual operation. Like that. As a result, the fuel supply source and the fuel tank can be communicated, and this position of the pipe mounting member is the fuel supply position, and the fuel tank is supplied with fuel from the fuel supply source side.

  Here, the fuel pipe is connected to an upper surface or an upper position of the fuel tank, and extends downward along the side wall portion of the fuel tank from this connection position. And the front-end | tip part connected with the fuel supply source side piping in this fuel piping is attached to a piping attachment member. For this reason, the fuel pipe is fixed by a clamp member at one or a plurality of locations on the side wall portion of the fuel tank and the pipe mounting member.

JP 2005-16332 A

  By the way, in the storage position of the pipe mounting member, the angle is approximately 90 degrees with respect to the side wall of the fuel tank. At the fuel supply position, the pipe mounting member is at an angle of 90 degrees or less with respect to the side wall portion of the fuel tank, and the fuel pipe is extended at a gentle angle. The fuel pipe is entirely composed of a flexible hose, or bent at least between the clamp member at the lowest position on the side wall of the fuel tank and the clamp member provided at the position closest to the pivot center of the pipe mounting member. It consists of a flexible hose with flexibility in the direction. Therefore, the portion between the two clamp members described above in the fuel pipe is a movable part during operation that moves when the pipe mounting member is rotated.

  Here, in the fuel pipe, when the pipe mounting member is in the fuel replenishing position, the movable part of the fuel pipe has a moderate degree of bending at the transition from the side wall of the fuel tank to the pipe mounting member, and stores the pipe mounting member. When it is in the position, the fuel pipe will be bent suddenly. In addition, there is a difference in distance between the pipe mounting member and the side wall of the fuel tank. Therefore, even when the pipe mounting member is set to the fuel supply position, the length of the movable part must be ensured during operation of the fuel pipe. For this reason, when the pipe mounting member is displaced to the retracted position, an extra length is generated in the movable part during operation of the fuel pipe.

  Since the flexible hose is exposed to the outside, it is necessary to give it high strength, and since the fuel flowing inside the flexible hose is pumped at a high pressure, the flexible hose is flexible in the bending direction. Although there is a certain amount, it has a certain amount of waist and rigidity. For this reason, when the pipe mounting member is in the retracted position, the extra length of the fuel pipe may be pressed against the side wall of the fuel tank and compressed, resulting in damage or wear. In addition, the fuel pipe may bend in the left-right direction of the side wall of the fuel tank, bend in a direction away from the side wall, and the direction of the bend and the degree of deformation are also flexible. There is also a risk of damaging or deforming the member disposed on the surface.

  The present invention has been made in view of the above points. The object of the present invention is to prevent the fuel pipe from being worn or damaged even when the pipe mounting member is rotated in the vertical direction. The object is to operate in such a way as not to interfere with other members arranged around the fuel tank.

  In order to achieve the above-described object, the present invention includes a fuel tank installed in an upper swing body of a construction machine, a pipe attachment member having one end rotatably connected to the upper swing body by a pivot shaft in the vertical direction. A fuel pipe having at least a part formed of a flexible hose, extending downward from the upper part of the fuel tank along the side wall portion, and having a tip disposed on the pipe mounting member. A fuel supply device for a construction machine configured to rotate and displace between a storage position along a lower surface of the upper swing body and a fuel supply position inclined at a predetermined angle below the upper swing body, wherein the fuel pipe is The fuel tank is fixed to the side wall of the fuel tank and the pipe mounting member by one or more clamp members, and the fuel tank has the fuel tank when the pipe mounting member is in the retracted position. An extra length holding member that absorbs the extra length of the pipe is provided, and the extra length holding member includes a stopper portion that holds the fuel pipe in the storage position at a predetermined position, and the fuel pipe is connected to the stopper. It is characterized by comprising a guide surface portion that slides on the portion.

  Here, the guide surface portion of the extra length holding member is inclined with respect to the side wall portion of the fuel tank toward the corner portion in a direction approaching the side wall portion, and both ends of the guide surface portion are connected to the side wall portion. If it is configured to bend so as to rise in a direction away from the portion, the fuel pipe is smoothly and reliably displaced to the position of the stopper portion. Moreover, the protective function of fuel piping improves by providing the buffer sheet comprised by rubber | gum, resin, etc. in the inner surface of the surplus length part holding member.

  When the pipe mounting member is set to the fuel supply position, it is desirable that the movable part is in a free state during operation of the fuel pipe and has a length to hold the load so that no load acts in the compression direction or in the pulling direction. . When the pipe mounting member is displaced from the fuel replenishment position to the storage position, in order to securely move the extra length holding member to the stopper part, the position of the side wall of the fuel tank in the fuel pipe and the pipe mounting member The position of the fuel pipe is offset so that the side of the side wall is closer to the stopper. In addition, when the fuel pipe is in operation, the clamping member constituting the both end positions of the movable part is attached to the end portion on the side wall portion side with the extra length holding member attached to the end portion position on the pipe attachment member side. The position is close to the side wall of the fuel tank. Thereby, when the pipe mounting member which is a movable side member is turned upward, it is directed toward the side wall from the mounting part side to the pipe mounting member of the fuel pipe of the movable part during operation. Moreover, as a result of being pushed toward the stopper portion of the extra length holding member, the fuel pipe is surely directed toward the stopper portion of the extra length holding member.

  When the pipe mounting member rotates in the vertical direction, the movable part is deformed so that it always bends in a certain direction during operation of the fuel pipe, and is pressed against the side wall of the fuel tank without causing wear or damage, Moreover, it can be operated so as not to interfere with other members arranged around the fuel tank.

1 is a configuration explanatory diagram of a large hydraulic excavator as an example of an apparatus provided with a fuel supply device according to an embodiment of the present invention. FIG. In the fuel supply apparatus of FIG. 1, it is a structure explanatory drawing when a piping attachment member is made into a storage position. FIG. 3 is a side view of FIG. 2. It is structure explanatory drawing when a pipe attachment member is made into a fuel replenishment position. FIG. 5 is a side view of FIG. 4. It is the figure seen from the arrow D direction of FIG. It is operation | movement explanatory drawing of a movable part at the time of operation | movement of fuel piping.

    Hereinafter, embodiments of the present invention will be described with reference to the drawings. First, FIG. 1 shows a configuration of a hydraulic excavator of a large hydraulic excavator as an example of a construction machine provided with a fuel supply device. In the figure, 1 is a lower traveling body and 2 is an upper turning body. The lower traveling body 1 includes a crawler traveling means having a crawler belt. The upper turning body 2 is connected to the lower traveling body 1 through a turning device 3, and the upper turning body 2 is equipped with a loader type working means 4 for performing work such as excavation of earth and sand. Moreover, the building 5 is installed in the upper revolving structure 2, The operator's cab 6 for the operator boarding and operating a machine is installed in the upper part of this building 5. FIG. An engine is mounted inside the building 5, and a hydraulic pump is operated by driving the engine, and a hydraulic cylinder and a hydraulic motor are driven by the pressure oil from the hydraulic pump. Traveling, turning operation of the upper turning body 2, driving of the working means 4 and the like are performed.

  In order to supply fuel to the engine, as shown in FIGS. 2 to 5, the upper swing body 2 is provided with a fuel tank 10. When the fuel is consumed, it is replenished. For this purpose, a fuel pipe 11 is drawn from the fuel tank 10. The fuel pipe 11 is supplied with fuel from a fuel supply source (not shown) such as a tank truck. Here, the upper-part turning body 2 is composed of a plurality of frames, and is further provided with an under cover and the like.

  The fuel tank 10 is installed and fixed on a support portion 12 that is fixedly provided on any one of the frames 7 provided on the upper swing body 2. Here, the fuel is replenished to the fuel tank 10 at its upper position, and the upper surface of the fuel tank 10 to be refueled is arranged at a high place, and the fuel supply pipe is connected to the fuel tank 10. It is extremely difficult, if not impossible, to connect to the fuel tank 10 by pulling it up to the top. Therefore, a connecting portion 11 a of the fuel pipe 11 is provided at an upper position in the side wall portion 10 a of the fuel tank 10. The fuel pipe 11 extends straight downward from the connecting portion 11a.

  The front end of the fuel pipe 11 is a connecting portion 11b, and fuel is supplied by connecting the connecting portion 11b to a fuel supply source. This refueling operation is performed manually by an operator on the ground, and the piping from the fuel supply source is connected to the connecting portion 11 b of the fuel piping 11. And when working using a hydraulic excavator, it stores so that the fuel piping 11 may not be exposed outside. In other words, when refueling, the connecting portion 11b of the fuel pipe 11 is pulled downward, and at other times, the fuel pipe 11 is set to the retracted position so as not to be exposed to the outside.

  For this purpose, a rotating arm 13 is provided as a pipe attachment member of the fuel pipe 11, and the connecting arm 11 b of the fuel pipe 11 to the fuel supply source is moved up and down by the rotating arm 13. One end of the pivot arm 13 is connected to the lower surface of the support beam 8 provided at the lower position of the upper swing body 2 by using a hinge 14. Accordingly, the pivot arm 13 is vertically moved around the hinge 14 as a pivot center. Can be rotated. That is, FIG. 2 and FIG. 3 show a storage position in which the lower surface 2a of the upper swing body 2 is in a horizontal state, whereby the fuel pipe 11 is connected between the rotating arm 13 and the lower surface 2a of the upper swing body 2. It is covered in between so that it is not exposed to the outside. On the other hand, FIGS. 4 and 5 show the fuel supply position of the rotating arm 13. In this refueling position, the pivot arm 13 pivots downward about the hinge 14 as a pivot center. Here, the angle of the turning arm 13 at the fuel supply position is set to an angular position of about 45 degrees downward from the horizontal state as the storage position. And although illustration is abbreviate | omitted, the rotation arm 13 is provided with the angle control means which is not shown in figure so that it can hold | maintain in the horizontal state of a storing position, and the angle state to diagonally downward used as a fuel supply position.

  Since the turning arm 13 to which the fuel pipe 11 is attached turns, at least a transition portion from the side wall 10a of the fuel tank 10 to the turning arm 13 must be flexible in the bending direction. . Therefore, the entire fuel pipe 11 is composed of a flexible hose. However, the portion of the fuel pipe 11 that extends along the side wall portion 10a is always exposed to the outside, and high-pressure fuel flows through the inside. It has the waist and rigidity. The fuel pipe 11 is fixedly held at a plurality of locations (three locations in the illustrated case) using a clamp member 15 at a portion extending downward along the side wall portion 10a. Further, even after the shift to the rotating arm 13 of the fuel pipe 11, the clamp members 15 are fixedly held at a plurality of places as in the side wall portion 10 a. Here, two clamp members 15 are provided on the surface of the rotating arm 13. Further, a guide member 16 is provided on the surface of the rotating arm 13 so as to cover the upper position of the connecting portion between the hinge 14 and the support beam 8. A clamp member 15B is provided on the guide member 16 so that the fuel pipe 11 is sandwiched between the pivot arm 13 and the support beam 8 when the pivot arm 13 moves up and down. Is prevented.

  When the rotating arm 13 is rotated, the fuel pipe 11 made of a flexible hose has a clamp member at the lowest position provided on the side wall 10a as 15A and a clamp member provided on the guide member 16 as 15B. Sometimes, the part between the clamp members 15A-15B is a movable part during operation in which the part is bent. Here, in the path of the fuel pipe 11 between the clamp members 15A and 15B, when the clamp member 15A and the clamp member 15B are connected by a straight line at the retracted position in FIG. 2 and the fuel supply position in FIG. Therefore, the required length of the movable part during operation in the fuel pipe 11 is different.

  Therefore, the length between the clamp members 15A and 15B is set to a length at which no slack or tension acts substantially at this time with reference to the state of the fuel supply position. For this reason, when the rotating arm 13 is displaced from the fuel supply position to the retracted position, an extra length is generated in the fuel pipe 11, but the extra length is absorbed by the bending of the fuel pipe 11. . At this time, the movable part during operation of the fuel pipe 11 always bends in a fixed direction through a fixed path. An extra length holding member 20 is provided on the side wall 10a of the fuel tank 10 to hold the extra length portion of the fuel pipe 11 so as to be pressed below the attachment portion of the clamp member 15A.

  As is apparent from FIG. 6, an inclined block 22 is fixed with a bolt 23 to a bracket 21 that is fixed to the side wall portion 10a of the fuel tank 10 by means of welding or the like, and the extra length holding member 20 is inclined. Fixed to the block 22. Therefore, the surplus length portion holding member 20 has an inclined surface portion 20a inclined in a direction approaching the side wall portion 10a toward the corner portion 10b side with respect to the side wall portion 10a, and the side wall of the inclined surface portion 20a. The end on the side closest to the portion 10a is bent so as to rise to form a stopper wall portion 20b.

  A bent portion between the inclined surface portion 20a and the stopper wall portion 20b in the surplus portion holding ratio 20 is configured to function as a stopper portion. Further, a rising portion is also formed at the end of the inclined surface portion 20a farthest from the side wall portion 10a, and this rising portion functions as the calling wall portion 20c. The stopper wall portion 20b and the calling wall portion 20c are slightly opened toward the distal end, that is, the portion bent from the inclined surface portion 20a toward the stopper wall portion 20b is also bent toward the calling wall portion 20b. The part also has an angle that is somewhat larger than 90 degrees. Note that the bent portion may be in a curved state. Further, the inner surface of the extra length holding member 20, that is, the surface facing the fuel pipe 11, includes the inclined surface portion 20 a, the stopper wall portion 20 b, and the calling wall portion 20 c on the entire surface, and a cushioning sheet 24 made of a cushioning member such as rubber. Is attached. Here, the buffer sheet 24 can be formed of a member that absorbs an impact such as rubber, but can also be formed of a hard synthetic resin in order to exhibit a good sliding property as well as a buffer property.

  The fuel supply device of the present invention is configured as described above. In the normal state, as shown in FIG. 2, the rotating arm 13 is in the storage position, and the fuel pipe 11 is formed of a flexible hose. Is held along the lower surface 2a of the upper swing body 2 so as not to be exposed to the outside. When the liquid level of the fuel tank 10 is lowered, the revolving arm 13 is rotated downward with the hinge 14 as a rotation center in order to replenish the fuel. As a result, the connecting portion 11b of the fuel pipe 11 is exposed to the outside, and is held at a height position at which an operator can easily perform an operation of connecting to the pipe from the fuel supply source. Fuel is filled into the fuel tank 10 by driving a pump or the like in a state where the inside of the fuel tank 10 and the fuel supply source communicate with each other via the fuel pipe 11. Then, when the fuel level in the fuel tank 10 reaches a predetermined height position, this is detected, the pump is stopped, and the fuel pipe 11 and the fuel supply source are separated.

  When the replenishment of fuel is completed as described above, the turning arm 13 is turned upward to be along the bottom surface of the upper turning body 2. At this time, the movable part at the time of operation between the clamp members 15A-15B in the fuel pipe 11 is bent. Although the fuel pipe 11 has flexibility in the bending direction, it has a waist and has a high degree of rigidity, so that the radius of curvature of the bent portion is large, and an extra length is generated for the bent path. It will be. If the extra length of the fuel pipe 11 is extremely pressed against the side wall portion 10a or meanders, the fuel pipe 11 will be damaged or worn. Various parts and members may be installed in the vicinity of the arrangement portion of the fuel pipe 11, and if the fuel pipe 11 is bent in an arbitrary direction such as a direction away from the side wall 10a, There is also a risk of damaging or deforming the member.

  However, in the side wall portion 10a of the fuel tank 10, an extra length holding member 20 is provided at a lower position of the clamp member 15A, and during the operation in which the rotating arm 13 is displaced from the fuel supply position to the storage position, The fuel pipe 11 is held between the inclined surface portion 20a of the surplus length portion holding member 20 and the stopper wall portion 20b so that the fuel pipe 11 moves to a corner portion of a bent or curved portion and does not move at that position. Is done.

  That is, as shown in FIG. 7, in the fuel supply position, the fuel pipe 11 is at the position P1, but when the rotating arm 13 is rotated upward about the hinge 14, an extra length is generated in the middle of the movement. It moves to the position of P2 in contact with the inclined surface portion 20a of the portion holding member 20. When the rotating arm 13 is further rotated, the extra length holding member 20 slides along the inclined surface portion 20a. When the rotating arm 13 is in the horizontal storage position, the fuel pipe 11 is a solid line. It moves to the position of P3 shown by. When the storage position of the rotating arm 13 is reached, the corner portion formed by the inclined surface portion 20a and the stopper wall portion 20b of the extra length holding member 20 is the moving end position of the fuel pipe 11, and the fuel pipe 11 is rotated. When the moving arm 13 is in the retracted position, the fuel pipe 11 is stopped.

  The fuel pipe 11 is brought into contact with the extra length holding member 20 and must be moved toward the stop position, that is, the corner between the inclined surface portion 20a and the stopper wall portion 20b, and moved in the other direction. In order to avoid such a situation, it is necessary to move the extra length portion holding member 20 toward the inclined surface portion 20a with certainty according to the rotation of the rotary arm 13. Even if the movable part during operation between the clamp members 15A and 15B in the fuel pipe 11 is under any condition, it bends toward the outside of the stopper wall part 20b or the inlet wall part 20c, or the side wall part 10a of the fuel tank 10 Do not bend in the direction away from.

  As shown in FIG. 3, the fuel pipe 11 extends downward along the side wall portion 10 a of the fuel tank 10, but the fixed portion by the clamp member 15 </ b> A from the connection portion of the fuel pipe 11 to the fuel tank 10. The region up to is a position close to the corner portion 10b of the fuel tank 10. In contrast, the arrangement position of the clamp member 15B, which is a fixed portion of the fuel pipe 11 on the rotating arm 13 side, is biased to the inside of the corner portion 10b of the side wall portion 10a, that is, to the center side of the corner portion 10b. Is in position. Further, the distance from the side wall 10a to the clamp member 15A and the clamp member 15B is such that the clamp member 15B is separated from the clamp member 15A, and the clamp member 15B is outward from the clamp member 15A as shown in FIG. Protrusively toward. When the pivot arm 13 is pivoted upward, the clamp member 15A is a fixed side, and the clamp member 15B is a movable side.

  Therefore, when the rotating arm 13 rotates, the fuel pipe 11 always pushes the surplus portion holding member 20 toward the inclined surface portion 20a and toward the stopper wall portion 20b. Will act. When the rotating arm 13 is in the retracted position, it is surely disposed in the stopper region formed at the corner of the inclined surface portion 20a and the stopper wall portion 20b of the extra length holding member 20. Further, when the fuel pipe 11 is displaced from the storage position to the fuel supply position, the fuel pipe 11 is displaced in a direction away from the inclined surface portion 20a and away from the stopper wall portion 20b with respect to the surplus length portion holding member 20. Become.

  Here, at the time of transition from the fuel supply position to the storage position, the fuel pipe 11 contacts the surplus length portion holding member 20 and slides along the inclined surface portion 20a. Since the seats 24 are laminated, the fuel pipe 11 wears when moving along the inclined surface portion 20a while exhibiting a buffering action when the fuel pipe 11 contacts the surplus length portion holding member 20. Can be suppressed. In addition, the contact position between the extra length holding member 20 and the fuel pipe 11 is a predetermined position displaced downward from the clamp member 15A by a predetermined interval depending on the degree of flexibility of the fuel pipe 11 in the bending direction. The dimension in the width direction of the extra length holding member 20 does not need to be too wide.

2 Upper revolving body 10 Fuel tank 11 Fuel pipe 11a Connection portion 11b Connection portion 13 Rotating arm 14 Hinge 15, 15A, 15B Clamp member 16 Guide member 20 Extra length holding member 20a Inclined surface portion 20b Stopper wall portion 20c Incoming wall portion

Claims (3)

A fuel tank installed on the upper swing body of the construction machine, a pipe mounting member whose one end is pivotably connected to the upper swing body by a pivot shaft, and at least a part thereof is a flexible hose, A fuel pipe that extends downward along the side wall from the upper part of the fuel tank and has a tip disposed on the pipe mounting member, the pipe mounting member being in a retracted position along the lower surface of the upper swing body; In the fuel supply device for a construction machine configured to rotate and displace to a fuel supply position inclined at a predetermined angle below the upper swing body,
The fuel pipe is fixed to the side wall of the fuel tank and the pipe mounting member by a clamp member at one or a plurality of locations,
On the side wall of the fuel tank, an extra length holding member that absorbs the extra length of the fuel pipe when the pipe attachment member is in the retracted position is provided,
The surplus length portion holding member includes a stopper portion that holds the fuel pipe in the storage position at a predetermined position, and a guide surface portion that slides and guides the fuel pipe to the stopper portion. Fuel supply device. The guide surface portion of the extra length holding member is inclined with respect to the side wall portion of the fuel tank toward the corner portion in a direction approaching the side wall portion, and both ends of the guide surface portion are connected to the side wall portion. The fuel supply device according to claim 1, wherein the fuel supply device is bent so as to rise in a direction away from the portion. The fuel supply device according to claim 1, wherein a buffer sheet is provided on an inner surface of the extra length holding member.

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