JP2017110420A - Small-sized construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To rigidly fix a fuel tank by a simple constitution, and to increase a volume of fuel.SOLUTION: A notched region 21 which is formed by notching an upper side position of a right face part 19D into an L-shape, and composed of a bottom face part 21A and a depth face part 21B of the notched region 21 which erects from a depth part of the bottom face part 21A is arranged at a fuel tank 19. In the notched region 21, there are arranged a tank fixing bracket 24 which is composed of a bottom face plate 24A opposing the bottom face part 21A, a depth face plate 24B integrated with the bottom face plate 24A, and opposing the depth face part 21B, and an attachment plate 24C integrated with a rear end of the bottom face plate 24A and a rear end of the depth face plate 24B, and opposing a front face plate 18A of a working fluid tank 18. In the tank fixing bracket 24, the bottom face plate 24A abuts on the bottom face part 21A, the depth face plate 24B abuts on the depth face part 21B, and the attachment plate 24C is attached to the front face plate 18A of the working fluid tank 18, thus positioning the fuel tank 19.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a construction machine such as a hydraulic excavator, and more particularly to a small construction machine in which a hydraulic oil tank and a fuel tank are mounted on a revolving frame.

  In general, a hydraulic excavator, which is a typical example of a construction machine, is provided with a self-propelled lower traveling body, an upper revolving body that is turnably mounted on the lower traveling body, and an upper revolving body that can be raised and lowered. And a front device.

  Here, the hydraulic excavator includes a small hydraulic excavator for performing work in a narrow work site or the like. This small hydraulic excavator is usually called a mini excavator and is used for dismantling work inside buildings, excavation work in narrow streets, etc. For example, the machine weight is about 0.7 to 8 tons It is suppressed. Therefore, the small hydraulic excavator has a compact overall vehicle body including the lower traveling body and the upper turning body.

  An upper swing body of a small hydraulic excavator is located on the front side of the swing frame that forms a support structure, a counterweight that is provided on the rear side of the swing frame and that balances the weight with the front device, and on the front side of the counterweight. An engine that is mounted horizontally on the swivel frame and that extends horizontally and drives a hydraulic pump, a front plate that is erected on the swivel frame from the front side of the engine, and a rear side that is above the front plate A driver seat pedestal comprising a seat mounting plate that extends to cover the upper side of the engine and has a driver seat attached thereto; a footrest member provided on the revolving frame located on the front side of the driver seat pedestal; and the footrest A hydraulic oil tank disposed on the side of the member and provided in the revolving frame, and a fuel provided in the revolving frame adjacent to the front side of the hydraulic oil tank It comprises a tank, a tank cover which rear portion is rotatably provided as a fulcrum supporting member of the rotating frame side in order to cover the upper side of the fuel tank and the hydraulic oil tank.

  The small hydraulic excavator constructed in this way has the width dimension in the left and right directions of the lower traveling body and upper revolving body in consideration of passing through narrow alleys and entrances to buildings and transporting by small trucks. It is set small. On the other hand, the length in the front and rear direction of the upper swing body is designed to be compact so that it does not deviate greatly from the width dimension of the lower travel body and can be swung in a narrow work site. Specifically, the counterweight provided at the rear part of the upper swing body is disposed at a position close to the center of rotation so that the rear side of the upper swing body can be turned with a small turning radius. On the other hand, the front device is designed so that the operator seated in the driver's seat can easily see the operation and can operate with a stable moment balance with the rear side of the upper swing body (the center of rotation). ).

  Therefore, in a small hydraulic excavator, the upper swing body is downsized in the front, rear, left, and right directions, and it is necessary to devise a method for installing the equipment to be mounted in a limited installation space. In this case, the size of the engine, the cooling device, the hydraulic pump, the hydraulic oil tank, and the like is determined depending on conditions such as the number of actuators and operation performance. On the other hand, the fuel tank has a fixed structure and a shape so that it can be installed in a limited remaining space and can store a large amount of fuel.

  As an example of the fuel tank fixing structure, a fuel is provided on the front side of the hydraulic oil tank using a band extending in the left and right directions (horizontal direction) and a band extending in the front, rear direction, and upward and downward directions (vertical direction). The structure which fixes a tank is known (for example, refer patent document 1).

  In addition, a fuel tank fixing structure is known in which a bracket formed by bending a plate material using a fuel filler port is attached and the bracket is fixed to a hydraulic oil tank (for example, Patent Document 2).

International Publication No. 2013/021768 JP 2012-193575 A

  By the way, as in Patent Document 1, in the method of fixing the fuel tank using two bands, a concave portion is formed along the band in the fuel tank so that the band does not shift with respect to the fuel tank. Yes. In the configuration in which the two concave portions are provided for the two bands, the shape of the fuel tank is limited and the volume is reduced. Therefore, it is difficult to increase the capacity of the fuel tank. In addition, since the band itself has flexibility, even if the fuel tank is tightened with two bands, the fuel tank may move during operation or traveling.

  On the other hand, in the configuration in which the bracket engaged with the fuel filler port is fixed to the hydraulic oil tank as in Patent Document 2, the bracket may be deformed to move the fuel tank. In particular, since a fuel tank filled with fuel is heavy, it is difficult to support it with a bracket that is simply bent.

  The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to provide flexibility in the shape and mounting structure of the fuel tank and to firmly fix the fuel tank with a simple configuration. It is another object of the present invention to provide a small construction machine that can increase the capacity of fuel.

  The present invention comprises a self-propelled lower traveling body, an upper revolving body that is turnably mounted on the lower traveling body, and a front device that is provided on the upper revolving body so as to be able to move up and down. The swivel body includes a swivel frame that forms a support structure, a counterweight that is provided on the rear side of the swivel frame and that balances the weight with the front device, and is located on the front side of the counterweight, An engine that is mounted in a horizontally extending state and that drives a hydraulic pump; a front plate that is erected on the swivel frame from the front side of the engine; and an upper side of the engine that extends from the top of the front plate to the rear side A driver seat pedestal comprising a seat mounting plate that covers the driver seat, and a footrest member provided on the revolving frame located on the front side of the driver seat pedestal, and the foot A hydraulic oil tank disposed on a side of the hydraulic member and provided on the revolving frame; a fuel tank provided on the revolving frame adjacent to a front side of the hydraulic oil tank; and the hydraulic oil tank and the fuel tank. In the small construction machine, the rear portion of the fuel tank includes a tank cover that is rotatably provided with the support member on the swivel frame side as a fulcrum to cover the upper side. Is cut out in an L shape to provide a notch portion comprising a bottom surface portion and a back surface portion rising from the back of the bottom surface portion, and the notch portion of the fuel tank includes the bottom surface portion of the notch portion. A bottom plate facing the bottom plate, a back plate integrated with the bottom plate and facing the back surface portion of the notch, a rear end of the bottom plate and a rear end of the back plate, and integrated with the hydraulic oil tank Facing the front A tank fixing bracket formed by an attached plate, the tank fixing bracket is configured such that the bottom plate is in contact with a bottom surface portion of the notch portion, and the back plate is in contact with a back surface portion of the notch portion, The fuel tank is positioned by attaching the mounting plate to the front surface of the hydraulic oil tank.

  According to the present invention, it is possible to provide flexibility in the shape and mounting structure of the fuel tank, the fuel tank can be firmly fixed with a simple configuration, and the fuel capacity can be increased.

It is a front view which shows the small hydraulic excavator which concerns on embodiment of this invention. FIG. 2 is a partially broken front view showing the hydraulic excavator of FIG. 1 with a tank cover of an exterior cover opened. It is a top view which expands and shows a lower traveling body and the upper turning body which abbreviate | omitted the exterior cover. FIG. 4 is a plan view showing the lower traveling body and the upper swing body of FIG. 3 with a driver seat base, a footrest member, a driver seat, and the like omitted. It is a perspective view shown in the state where a hydraulic oil tank, a fuel tank, a tank fixing bracket and the like are mounted on a turning frame. FIG. 4 is a partially cutaway right side view of the right side portion of the revolving frame, a hydraulic oil tank, a fuel tank, a tank fixing band, a tank fixing bracket, a catch member, and the like viewed from the front side. It is sectional drawing of the principal part expansion which looked at the attachment state of the tank cover from the arrow VII-VII direction in FIG. It is a disassembled perspective view which shows a hydraulic-oil tank, a fuel tank, a tank fixing band, and a tank fixing bracket. It is a perspective view shown in the state which assembled the tank fixing bracket, the catch member, and the cushioning material. It is a disassembled perspective view shown in the state which separated the tank fixing bracket and the catch member.

  Hereinafter, as a representative example of a small construction machine according to an embodiment of the present invention, a small hydraulic shovel with a canopy specification, a so-called mini excavator will be described as an example, and a detailed description will be given according to FIGS.

  1 and 2, a hydraulic excavator 1 as a construction machine is configured as a canopy-spec small hydraulic excavator (mini excavator). The small hydraulic excavator 1 includes a crawler-type lower traveling body 2 that can be self-propelled and an upper revolving body 3 that is rotatably mounted on the lower traveling body 2. A swing-type front device 4 that can swing left and right is provided on the front side of the upper swing body 3. The front device 4 is used for excavating earth and sand. Here, since the small hydraulic excavator 1 is used for dismantling work inside a building and excavation work in a narrow place such as a street, the machine weight (total weight) is suppressed to about 0.7 to 8 tons, for example. It has been.

  As shown in FIG. 3, the upper swing body 3 has a width dimension in the left and right directions that is substantially equal to the vehicle width of the lower traveling body 2. Further, the upper swing body 3 is arranged on the front side (in the vicinity of a driver seat 14 described later) so that a counterweight 6 described later approaches the center of the swing. Thus, the small excavator 1 is a rear ultra-small turning type in which the outer surface 6A of the counterweight 6 is substantially within the vehicle width of the lower running body 2 when the upper turning body 3 turns on the lower running body 2. It is configured as a hydraulic excavator.

  The turning frame 5 forms a support structure for the upper turning body 3. As shown in FIGS. 4 and 5, the revolving frame 5 extends in a V shape so as to approach each other toward the front side on the bottom plate 5A, and a bottom plate 5A made of a thick steel plate or the like extending in the front and rear directions. A left front vertical plate 5B and a right front vertical plate 5C, a horizontal plate 5D which is located at the rear of the front vertical plates 5B and 5C and extends in the left and right directions, and a horizontal plate 5D. It includes a left rear vertical plate 5E and a right rear vertical plate 5F that extend to the rear side at intervals in the left and right directions. The front portions of the front vertical plates 5B and 5C serve as support brackets 5G that support the front device 4 so as to be swingable in the left and right directions.

  On the front side of the revolving frame 5, a left support member 5H located above the bottom plate 5A and extending to the left side from the left front vertical plate 5B, and positioned on the right side of the right front vertical plate 5C and rising from the bottom plate 5A and bent. A right support member 5J extending to the right front vertical plate 5C side is provided. The left support member 5H supports a front portion of a footrest member 11 to be described later. On the other hand, the right support member 5J is an attachment base for attaching a front side portion of a partition plate 13 to be described later.

  The counterweight 6 is provided on the rear side of the turning frame 5. The counterweight 6 balances the weight with the front device 4 and is formed as an arcuate heavy object whose left and right central portions protrude rearward.

  The counterweight 6 is formed so that the turning radius of the upper swing body 3 is reduced when the upper swing body 3 is turned. Specifically, the counterweight 6 has an arc-shaped outer surface 6A by curving the left and right sides toward the front side, and is arranged near the front side near the turning center of the turning frame 5 with this shape. ing.

  The engine 7 is mounted on the front side of the counterweight 6 on the rear side of the turning frame 5 in a horizontally placed state extending leftward and rightward. On the right side of the engine 7, a cooling fan 7 </ b> A for supplying cooling air to a heat exchange device 8 described later is provided. On the other hand, a hydraulic pump 9 described later is attached to the left side of the engine 7. As the prime mover, a hybrid prime mover in which an electric motor is provided in the engine may be employed.

  The heat exchange device 8 is provided on the right rear side of the revolving frame 5 so as to face the cooling fan 7 </ b> A of the engine 7. This heat exchange device 8 cools various fluids whose temperature has risen with cooling air. The heat exchange device 8 includes a radiator, an oil cooler, and the like (all not shown).

  The hydraulic pump 9 is provided on the left side of the engine 7. The hydraulic pump 9 is driven by the engine 7 to discharge hydraulic oil supplied from a hydraulic oil tank 18 described later as pressure oil toward a control valve device 33 described later.

  The driver seat base 10 covers the engine 7, the heat exchange device 8, the hydraulic pump 9, and the like, and supports a driver seat 14 described later (see FIG. 3). That is, the driver's seat pedestal 10 includes a front plate 10A erected on the turning frame from the front side of the engine 7 and a seat mounting plate 10B extending from the upper side of the front plate 10A to the rear side and covering the upper side of the engine 7 and the like. It is configured to include. On the upper side of the seat mounting plate 10B, a driver's seat 14 and left and right operation lever devices 15 and 16, which will be described later, are mounted.

  The footrest member 11 is located on the front side of the driver seat base 10 and is provided on the turning frame 5. In the footrest member 11 according to the present embodiment, at least one of the left and right directions, the left side in the left and right directions is an entrance 12 for an operator to get on and off.

  The partition plate 13 is positioned at the right end of the driver seat base 10 and the footrest member 11 on the opposite side of the left / right direction with respect to the entrance / exit 12 and extends in the front / rear direction. As shown in FIG. 6, the partition plate 13 has a mounting portion 13 </ b> A located on the front side thereof bolted to the right support member 5 </ b> J of the revolving frame 5, and the rear side is bolted to a structure such as a frame of the heat exchange device 8. It has been stopped. Further, the partition plate 13 has a partition wall surface 13B that shields between the driver seat base 10, the footrest member 11, and a hydraulic oil tank 18 and a fuel tank 19 which will be described later. A frame portion 13 </ b> C is formed extending in the front and rear directions while being bent to the right.

  Here, the attachment portion 13 </ b> A of the partition plate 13 is fixed to the right support member 5 </ b> J of the revolving frame 5, so as to face and contact the contact portion 19 </ b> K of the fuel tank 19. Thereby, the attachment portion 13A constitutes a regulating member that regulates the movement of the fuel tank 19 to the left side.

  The driver's seat 14 is provided at the center position of the seat mounting plate 10B constituting the driver's seat base 10 (see FIG. 3). The driver seat 14 is seated by an operator who operates the excavator 1. Further, on both the left and right sides of the driver's seat 14, operation lever devices 15 and 16 for operating the front device 4 and the like are disposed. In front of the driver's seat 14, an operation lever / pedal 17 for traveling and the like is disposed on the front side of the footrest member 11.

  Next, the hydraulic oil tank 18, the fuel tank 19, the tank fixing band 22, and their mounting relationship that constitute the characteristic part of the present invention will be described in detail.

  The hydraulic oil tank 18 is disposed on the right side of the footrest member 11 and is mounted on the revolving frame 5. The hydraulic oil tank 18 stores hydraulic oil for driving each actuator provided in the lower traveling body 2, the front device 4, and the like. Here, since the hydraulic oil pressure acts, the hydraulic oil tank 18 is formed as a rectangular parallelepiped pressure vessel that is long in the downward direction using a metal plate material. Thus, the hydraulic oil tank 18 is a structure that is integrally formed with the revolving frame 5 by being bolted onto the bottom plate 5A of the revolving frame 5.

  Specifically, the hydraulic oil tank 18 includes a front plate 18A, a rear plate 18B, a left plate 18C, a right plate 18D, an upper plate 18E, and a lower plate 18F. The front plate 18A is provided with, for example, two screw seats 18G located on the upper right side. Bolts 28 for fixing a tank fixing bracket 24 to be described later are screwed onto the two screw seats 18G.

  As shown in FIGS. 4 and 6, the left face plate 18 </ b> C is provided with a claw receiving member 18 </ b> H located at an intermediate portion in the upper and lower directions. The claw receiving member 18H is engaged with a claw portion 22A of a tank fixing band 22 which will be described later, and is firmly fixed to the left face plate 18C using welding means. On the other hand, the right face plate 18D is provided with a screw receiving member 18J near the front side at the same height as the claw receiving member 18H. A bolt insertion hole 18J1 is formed in the screw receiving member 18J so as to penetrate in the front and rear directions. In the screw receiving member 18J, a screw portion 22B of a tank fixing band 22 described later is inserted into the bolt insertion hole 18J1, and in this state, a nut 23 is screwed into the screw portion 22B, whereby the screw receiving member 18J On the other hand, the screw portion 22B can be fixed in the front and rear directions.

  The fuel tank 19 stores fuel to be supplied to the engine 7 and is provided in the revolving frame 5 adjacent to the front side of the hydraulic oil tank 18. The fuel tank 19 is formed as a sealed container made of a resin material because no pressure acts on the inside unlike the hydraulic oil tank 18. The fuel tank 19 includes a narrow front surface portion 19A extending in the upward and downward directions, a rear surface portion 19B that is spaced from the front surface portion 19A in the front and rear directions and faces the front plate 18A of the hydraulic oil tank 18, and a partition. It includes a left surface portion 19C as an inner surface facing the plate 13, a right surface portion 19D as an outer surface positioned on the outside in the left and right directions, an upper surface portion 19E, and a lower surface portion 19F.

  Here, the right surface portion 19D of the fuel tank 19 constitutes an arc-shaped outer peripheral surface, and is formed in an arc shape along an arc-shaped front side cover 29A of an exterior cover 29 described later. A notch portion 21 described later is formed in the rear portion of the arc-shaped right surface portion 19D.

  A band engaging groove 19G is formed in the fuel tank 19 at an intermediate portion in the upper and lower directions, that is, at the same height as the claw receiving member 18H and the screw receiving member 18J of the hydraulic oil tank 18. The band engaging groove 19G is formed as a recessed groove extending in the horizontal direction across the front surface portion 19A, the left surface portion 19C, and the right surface portion 19D. The band engaging groove 19G is positioned so that the tank fixing band 22 does not shift upward and downward.

  In the present embodiment, one tank fixing band 22 is used as one of means for fixing the fuel tank 19. In this case, it is necessary to form a band engaging groove 19G in the fuel tank 19 so that the tank fixing band 22 does not shift, and the internal volume of the fuel tank 19 is reduced by the band engaging groove 19G formed by the recessed groove. Or the shape becomes complicated. However, by suppressing the use of the tank fixing band 22 to one, it is possible to suppress a decrease in the internal volume of the fuel tank 19 and to suppress a change in shape to only the recessed groove in the horizontal direction. .

  The upper surface portion 19E of the fuel tank 19 is provided with a cap-equipped oil supply port 19H for supplying fuel. On the other hand, as shown in FIG. 6, the left tank 19C is provided with an extension tank 19J located below the band engaging groove 19G. The extension tank portion 19J expands the volume of the fuel tank 19 using a slight empty space on the revolving frame 5.

  Further, the left surface portion 19C is provided with a contact portion 19K located on the front side of the extension tank portion 19J (see FIG. 6). For example, the contact portion 19K is formed so as to protrude slightly from the left surface portion 19C, and can contact the attachment portion 13A of the partition plate 13 fixed to the turning frame 5 via the cushion material 20. The contact portion 19 </ b> K can regulate the movement of the fuel tank 19 to the left side in a state where it contacts the partition plate 13.

  Here, the right surface portion 19D that forms the outer surface of the fuel tank 19 faces an arcuate front side cover 29A of an outer cover 29, which will be described later, and has an arc having the same curvature as that of the arcuate front side cover 29A. It is formed as a surface. A cutout portion 21 described later is provided at an upper position of the right surface portion 19D.

  As shown in FIGS. 6 and 8, the cutout portion 21 is formed by cutting the rear portion of the right surface portion 19 </ b> D into an L shape at an upper position of the right surface portion 19 </ b> D as the arcuate outer surface of the fuel tank 19. ing. The cutout portion 21 includes a bottom surface portion 21A that extends substantially horizontally to the left from the right surface portion 19D, and a back surface portion 21B that rises from the back of the bottom surface portion 21A (position near the fuel filler port 19H). . The notch portion 21 is located on the front side of each screw seat 18G in a state where the fuel tank 19 is arranged on the front side of the hydraulic oil tank 18.

  The tank fixing band 22 binds the fuel tank 19 to the front side of the hydraulic oil tank 18, thereby restricting the fuel tank 19 from moving forward and rearward. The tank fixing band 22 is made of a metal strip having a tensile strength, and has a hook-like claw portion 22A at one end in the length direction and a rod-like shape at the other end in the length direction. A screw portion 22B is provided. While the tank fixing band 22 is disposed along the band engaging groove 19G of the fuel tank 19, the claw portion 22A at one end is engaged with the claw receiving member 18H of the hydraulic oil tank 18, and the screw portion 22B at the other end. Is inserted into the bolt insertion hole 18J1 of the screw receiving member 18J, and the nut 23 is screwed into the screw portion 22B. As a result, the fuel tank 19 can be fixed forward and backward by the hydraulic oil tank 18 and the tank fixing band 22.

  Next, the structure of the tank fixing bracket 24 provided for fixing the fuel tank 19 will be described as a characteristic part of the present invention.

  The tank fixing bracket 24 is located on the cutout portion 21 of the fuel tank 19 and is provided on the front plate 18 </ b> A of the hydraulic oil tank 18. The tank fixing bracket 24 regulates the movement of the fuel tank 19 to the right side (left side and the right side opposite to the footrest member 11) and the upward movement. Further, a catch member 26 for engaging a hook member 32 of an exterior cover 29 (tank cover 29D) described later is attached to the tank fixing bracket 24.

  The tank fixing bracket 24 has a rectangular shape extending in the horizontal direction, a bottom plate 24A facing the bottom portion 21A of the cutout portion 21, and a bottom plate 24A in a state of rising from the back (left end) of the bottom plate 24A. It is integrated with the rear face plate 24B which is integrated and faces the rear face portion 21B of the notch portion 21, the rear end of the bottom face plate 24A and the rear end of the rear face plate 24B, and rises from the rear end of the bottom face plate 24A. And a mounting plate 24 </ b> C facing the front plate 18 </ b> A of the hydraulic oil tank 18.

  Two bolt insertion holes 24 </ b> D are formed in the mounting plate 24 </ b> C of the tank fixing bracket 24 so as to be located on the lower side corresponding to the screw seats 18 </ b> G of the hydraulic oil tank 18. Further, two female screw holes 24E are provided on the upper side of the mounting plate 24C with an interval in the upward and downward directions. Each of the female screw holes 24E is to be engaged with a bolt 27 for attaching a catch member 26 described later. Each female screw hole 24E is formed, for example, as a weld nut in which a nut is welded to a through hole.

  In the tank fixing bracket 24, the bottom plate 24A is brought into contact with the bottom surface portion 21A of the notch portion 21 via a cushion material 25A described later, and the back plate 24B is contacted with the back surface portion 21B of the notch portion 21 via a cushion material 25B described later. The fuel tank 19 is positioned by contacting the mounting plate 24 </ b> C to the front plate 18 </ b> A of the hydraulic oil tank 18.

  The tank fixing bracket 24 forms a three-dimensional structure having three surfaces, that is, a bottom plate 24A, a back plate 24B, and a mounting plate 24C, that is, a trihedron, by bending, for example, one plate material. In this case, the tank fixing bracket 24 having a three-dimensional structure has high rigidity by supporting each other surface as compared with a bracket obtained by bending a single plate material into an L shape. Therefore, even when the tank fixing bracket 24 is formed using a thin plate material, it is possible to reliably suppress the movement of the fuel tank 19 that has accumulated a large amount of fuel and has become a heavy object.

  Each bolt insertion hole 24 </ b> D of the tank fixing bracket 24 is set to have a larger dimension than the diameter dimension of the thread portion of the bolt 28 to be inserted. In particular, it is formed large in the upward and downward directions, and as a whole, it is formed as a long hole elongated in the upward and downward directions. Therefore, each bolt insertion hole 24 </ b> D can be adjusted in the left, right, up, and down positions of the tank fixing bracket 24 with respect to the hydraulic oil tank 18. As a result, misalignment between the hydraulic oil tank 18 and the fuel tank 19 caused by an error in manufacturing the hydraulic excavator 1 can be absorbed by each bolt insertion hole 24D.

  As shown in FIGS. 6 and 9, the tank fixing bracket 24 has a plate-like cushion material 25A attached to the lower surface of the bottom plate 24A, and a plate-like cushion material 25B attached to the left surface of the back plate 24B. . Each of the cushion members 25A and 25B protects the resin fuel tank 19 with a metal tank fixing bracket 24 so as not to be damaged. Moreover, each cushion material 25A, 25B can also reduce the impact (load) transmitted from the fuel tank 19 to the tank fixing bracket 24.

  The catch member 26 is attached to the upper side of the tank fixing bracket 24. The catch member 26 is detachably engaged (latched) with a hook member 32 of a tank cover 29D described later. The catch member 26 includes an attachment portion 26A facing the attachment plate 24C of the tank fixing bracket 24, and a catch 26B attached to a bent portion 26A1 formed by bending the left side of the attachment portion 26A forward. In the catch 26B, a hook 32B of a hook member 32 described later is engaged with an upper portion inclined downward toward the front side.

  The mounting portion 26A is provided with two bolt insertion holes 26C at intervals in the upward and downward directions so as to correspond to the respective female screw holes 24E of the tank fixing bracket 24. The bolt insertion hole 26 </ b> C is formed as a long hole that is larger than the diameter dimension of the thread portion of the bolt 27 to be inserted, in substantially the same manner as the bolt insertion hole 24 </ b> D of the tank fixing bracket 24.

  Accordingly, the catch member 26 can be attached to the attachment plate 24 </ b> C by screwing the bolts 27 inserted into the respective bolt insertion holes 26 </ b> C into the female screw holes 24 </ b> E of the tank fixing bracket 24. In this case, the catch member 26 can be moved (adjusted) to the left, right, up, and down with respect to the tank fixing bracket 24 by loosening the bolts 27.

  Next, an example of a procedure for attaching the tank fixing bracket 24 and the catch member 26 will be described.

  First, as shown in FIG. 10, a bolt 27 is inserted into each bolt insertion hole 26C of the catch member 26, this bolt 27 is screwed into each female screw hole 24E of the tank fixing bracket 24, and the catch member 26 is attached to the mounting plate. Attach to 24C.

  As shown in FIG. 8, when the fuel tank 19 is attached to the front side of the hydraulic oil tank 18 using the tank fixing band 22, the tank fixing bracket 24 is disposed in the cutout portion 21 provided on the upper right side of the fuel tank 19. At this time, the tank fixing bracket 24 presses the bottom plate 24A against the bottom surface portion 21A of the cutout portion 21 via the cushion material 25A, and presses the back plate 24B against the back surface portion 21B of the cutout portion 21 via the cushion material 25B. . In this state, the bolts 28 are inserted into the bolt insertion holes 24D of the tank fixing bracket 24, and the bolts 28 are screwed into the screw seats 18G of the hydraulic oil tank 18. Thereby, the tank fixing bracket 24 can be attached to the hydraulic oil tank 18 together with the catch member 26.

  In a state where the tank fixing bracket 24 is attached to the hydraulic oil tank 18, the movement of the fuel tank 19 to the upper side can be regulated by the bottom plate 24A of the tank fixing bracket 24, and the right side (left, left) of the fuel tank 19 can be regulated by the rear surface plate 24B. The movement to the right outside) can be restricted. When the tank fixing bracket 24 is attached, the tank fixing bracket 24 can be attached to an appropriate position by each bolt insertion hole 24D.

  The exterior cover 29 covers various devices mounted on the revolving frame 5. The exterior cover 29 is positioned between an arcuate front side cover 29A that covers from the front side of the fuel tank 19 to the right side of the hydraulic oil tank 18, and a rear end of the arcuate front side cover 29A and the right end of the counterweight 6. An arc-shaped rear side cover 29B covering the heat exchange device 8, an engine cover 29C provided on the counterweight 6 so as to cover the rear side of the engine 7, and a tank cover covering the upper sides of the hydraulic oil tank 18 and the fuel tank 19 29D. The arc-shaped front side cover 29 </ b> A and the arc-shaped rear side cover 29 </ b> B extend in an arc shape to the front side following the outer surface 6 </ b> A of the counterweight 6.

  As shown in FIG. 7, the exterior cover 29 is provided with a hinge member 31 for rotatably attaching the rear portion of the tank cover 29D to the hinge attachment portion 30A of the support member 30 on the revolving frame 5 side. . Accordingly, as shown in FIG. 2, the tank cover 29D can be rotated (opened / closed) in the upward and downward directions with the hinge member 31 on the rear side as a fulcrum. As shown in FIG. 5, the support member 30 on the revolving frame 5 side is attached to the revolving frame 5 or a structure fixed to the revolving frame 5, and an upper portion thereof is a hinge attachment portion 30 </ b> A for attaching the hinge member 31. It has become.

  A hook member 32 is provided on the inner surface 29D1 of the tank cover 29D. The hook member 32 is disposed at a position where it can engage with the catch member 26 on the fuel tank 19 with the tank cover 29D closed. The hook member 32 is detachably attached to the catch 26B of the catch member 26 by being operated by an operation button 32A (see FIGS. 1 and 2) operated from the outside of the tank cover 29D and the operation button 32A. And a hook 32B to be joined. Here, the engagement position between the catch 26B of the catch member 26 and the hook 32B of the hook member 32 can be adjusted to an appropriate engagement position by moving the catch member 26.

  As shown in FIG. 4, the control valve device 33 is disposed on the revolving frame 5 so as to be located below the footrest member 11. Further, as shown in FIGS. 1 and 2, the canopy 34 is provided so as to cover the upper side of the driver's seat 14.

  Next, an example of an operation procedure when the fuel tank 19 is provided on the revolving frame 5 adjacent to the front side of the hydraulic oil tank 18 will be described.

  First, the fuel tank 19 is disposed on the bottom plate 5 </ b> A of the revolving frame 5, located on the front side of the hydraulic oil tank 18. In this state, the fuel tank 19 is fixed to the front side of the hydraulic oil tank 18 using the tank fixing band 22. As a result, the fuel tank 19 can be regulated to move downward by the bottom plate 5A, can be regulated to move rearward by the front plate 18A of the hydraulic oil tank 18, and further moved to the front by the tank fixing band 22. Can be regulated. At this time, the contact portion 19 </ b> K of the fuel tank 19 is brought into contact with the attachment portion 13 </ b> A of the partition plate 13 fixed to the revolving frame 5 via the cushion material 20, thereby restricting the leftward movement. be able to.

  On the other hand, a tank fixing bracket 24 is disposed in the cutout portion 21 of the fuel tank 19, and the tank fixing bracket 24 is attached to the front plate 18 </ b> A of the hydraulic oil tank 18. As a result, the fuel tank 19 can be restricted from moving upward by the bottom plate 24A of the tank fixing bracket 24, and can be restricted from moving to the right by the back plate 24B. With this mounting structure, the fuel tank 19 can be fixed in the front, rear, left, right and up and down directions.

  The small excavator 1 according to the present embodiment has the above-described configuration. Next, the operation of the excavator 1 will be described.

  An operator seated on the driver's seat 14 starts the engine 7 and drives the hydraulic pump 9. Thereby, the pressure oil from the hydraulic pump 9 is supplied to various actuators via the control valve device 33. Thereby, when the operator operates the operating lever / pedal 17 for traveling, the lower traveling body 2 can be moved forward or backward. On the other hand, by operating the operation lever devices 15 and 16 for work, the front device 4 and the like can be operated to perform excavation work of earth and sand.

  Thus, according to the present embodiment, the fuel tank 19 has a bottom surface portion 21B that rises from the bottom of the bottom surface portion 21A and the bottom surface portion 21A by cutting the upper position of the right surface portion 19D into an L shape. The notch part 21 which consists of is provided. The cutout portion 21 of the fuel tank 19 includes a bottom plate 24A that faces the bottom portion 21A of the cutout portion 21, a back plate 24B that is integrated with the bottom plate 24A and faces the back portion 21B of the cutout portion 21, and A tank fixing bracket 24 formed by a mounting plate 24C that is integrated with the rear end of the bottom plate 24A and the rear end of the back plate 24B and faces the front plate 18A of the hydraulic oil tank 18 is provided. On this, the tank fixing bracket 24 has the bottom plate 24A in contact with the bottom surface portion 21A of the cutout portion 21 and the back plate 24B in contact with the back surface portion 21B of the cutout portion 21. 24C is attached to the front plate 18A of the hydraulic oil tank 18 so that the fuel tank 19 is positioned.

  Therefore, in the present embodiment, since the movement of the fuel tank 19 to the upper side and the left side can be restricted by the single tank fixing bracket 24, only one tank fixing band 22 can be used. Thereby, in this Embodiment, compared with the method of fixing a fuel tank using two bands like patent document 1, since the recessed part for engaging a band can be decreased, it reduces. The capacity of the fuel tank 19 can be increased by the amount of the recessed portion. Alternatively, the fuel tank 19 can be reduced in size while ensuring an appropriate tank capacity.

  In addition, the tank fixing bracket 24 has rigidity compared to the band, and can be reliably fixed so that the fuel tank 19 does not move during operation or traveling. Thereby, since it is not necessary to provide a gap between the fuel tank 19 and surrounding members, the capacity of the fuel tank 19 can be increased in this respect as well.

  As a result, since the fuel tank 19 can have a degree of freedom in its shape and mounting structure, even when the installation space (layout space) of each component is limited like the small hydraulic excavator 1, the fuel tank 19 The tank 19 can be firmly fixed with a simple structure, and the capacity of the stored fuel can be increased. Furthermore, the hydraulic excavator 1 can be reduced in size.

  In particular, the counterweight 6 has an arcuate outer surface 6A whose left and right central portions protrude rearward, and the upper swing body 3 has an arcuate shape on the front side following the outer surface 6A of the counterweight 6. Arc-shaped side covers 29A and 29B are provided. The right surface portion 19D of the fuel tank 19 is formed in an arc shape along the facing arc-shaped front side surface cover 29A, and the notch portion 21 is formed by notching the rear portion of the arc-shaped right surface portion 19D of the fuel tank 19. ing.

  Here, it is difficult for the small excavator 1 to secure a space for fixing the fuel tank 19. However, in the present embodiment, the cutout portion 21 for fixing the fuel tank 19 can be easily provided only by cutting out a part of the fuel tank 19.

  Further, since the outer side surface of the fuel tank 19 is formed in an arc shape along the arc-shaped front side surface cover 29A of the substantially circular upper revolving structure 3, the capacity of the fuel tank 19 is limited within a limited installation space. It is possible to increase the operating time with a single refueling, and to increase work efficiency. On the other hand, the fuel tank 19 can be reduced in size while ensuring a desired capacity. Therefore, even if a part of the fuel tank 19 is cut out to form the cutout portion 21, a sufficient tank capacity can be obtained.

  Further, a tank fixing bracket 24 is disposed on the right surface portion 19D which is the outer surface of the fuel tank 19. Accordingly, the catch member 26 for hooking the rear side of the tank cover 29D can be attached to the tank fixing bracket 24, and a narrow space can be effectively used. Further, since the catch member 26 provided on the outer surface of the fuel tank 19 can be easily reached from the outside, it is possible to easily perform the attaching operation and the adjusting operation.

  The tank fixing bracket 24 includes a rectangular bottom plate 24A extending in the horizontal direction, a back plate 24B rising from the back of the bottom plate 24A, a rear end of the bottom plate 24A, and a rear plate of the back plate 24B. It is formed as a trihedron composed of a mounting plate 24C integrated with the end and rising from the rear end of the bottom plate 24A. Thereby, since the tank fixing bracket 24 can constitute a three-dimensional structure having three surfaces, that is, a trihedron, the tank fixing bracket 24 has high rigidity by supporting each other. Therefore, even when the tank fixing bracket 24 is formed by using a thin plate material, the tank fixing bracket 24 having a three-dimensional structure reliably suppresses the movement of the fuel tank 19 that stores a large amount of fuel and becomes a heavy object. be able to. Thereby, weight reduction of the tank fixing bracket 24, reduction of component cost, etc. can be aimed at.

  On the other hand, the tank cover 29D of the exterior cover 29 is provided with a hook member 32 located on the inner surface 29D1 of the tank cover 29D, and the hook member 32 is detachably engaged with the mounting plate 24C of the tank fixing bracket 24. A catch member 26 is provided. Thereby, since the bracket for providing the catch member 26 can be omitted, it is possible to reduce the size of the upper swing body 3 and to improve the assembly workability by the amount of the omitted bracket.

  Furthermore, the tank fixing bracket 24 is provided so that its position can be adjusted with respect to the hydraulic oil tank 18 in the upward, downward, leftward and rightward directions. Therefore, the displacement between the hydraulic oil tank 18 and the fuel tank 19 caused by an error in manufacturing the hydraulic excavator 1 can be absorbed by each bolt insertion hole 24D, and the mounting strength of the fuel tank 19 and the assembly workability can be improved. Improvements can be made. Thereby, since the dimensional accuracy of the hydraulic oil tank 18, the fuel tank 19, etc. can be set low, these manufacturing costs can be reduced and the small hydraulic excavator 1 can be manufactured inexpensively.

  In the embodiment, the case where the tank fixing band 22 having both ends in the length direction attached to the hydraulic oil tank 18 is used to restrict the movement of the fuel tank 19 to the front side is illustrated. However, the present invention is not limited to this, and for example, a structure that abuts the front surface portion 19A of the fuel tank 19 may be provided in the revolving frame 5 to restrict the movement of the fuel tank 19 to the front side. Further, at least one of the both ends of the tank fixing band 22 may be attached to the revolving frame 5, a structure provided on the revolving frame 5, or the like.

  In the embodiment, the case where the catch member 26 is attached to the tank fixing bracket 24 is illustrated. However, the present invention is not limited to this, and the tank fixing bracket 24 and the catch member 26 may be attached to the hydraulic oil tank 18 together.

  In the embodiment, there is illustrated a rear ultra-small turning type hydraulic excavator 1 including a circular upper turning body 3 in which a counterweight 6 is disposed at a position close to the turning center. However, the present invention is not limited to this, and may be applied to an ultra-small turning type hydraulic excavator that can turn within the vehicle width of the lower traveling body 2.

  Further, in the embodiment, the small hydraulic excavator 1 including the crawler type lower traveling body 2 is described as an example as a small construction machine. However, the present invention is not limited to this, and may be applied to, for example, a small hydraulic excavator provided with a wheel type lower traveling body.

1 Small excavator (small construction machine)
DESCRIPTION OF SYMBOLS 2 Lower traveling body 3 Upper turning body 4 Front apparatus 5 Turning frame 6 Counterweight 6A Outer surface 7 Engine 9 Hydraulic pump 10 Driver's seat base 10A Front plate 10B Seat mounting plate 11 Footrest member 14 Driver's seat 18 Hydraulic oil tank 18A Front plate ( (Front)
19 Fuel tank 19D Arc-shaped right surface (arc-shaped outer surface)
21 notch portion 21A bottom surface portion 21B back surface portion 24 tank fixing bracket 24A bottom surface plate 24B back surface plate 24C mounting plate 26 catch member 29 exterior cover 29A arc-shaped front side cover (arc-shaped side cover)
29D Tank cover 29D1 Inner surface 30 Support member 32 Hook member

Claims (5)

A self-propelled lower traveling body, an upper revolving body mounted on the lower traveling body so as to be able to swivel, and a front device provided on the upper revolving body so as to be able to move up and down,
The upper swing body includes a swing frame that forms a support structure, a counterweight that is provided on the rear side of the swing frame and that balances the weight with the front device, and is positioned on the front side of the counterweight to the swing frame. An engine mounted in a horizontal state extending in the left and right directions and driving a hydraulic pump, a front plate standing on the swivel frame from the front side of the engine, and extending from the upper part of the front plate to the rear side A driver seat pedestal comprising a seat mounting plate that covers an upper side of the driver seat and a driver seat is mounted; a footrest member provided on the swivel frame located on the front side of the driver seat base; and a side of the footrest member A hydraulic oil tank disposed in the swivel frame, a fuel tank provided in the swivel frame adjacent to a front side of the hydraulic oil tank, and the operation In construction machines of compact rear portion to cover the upper side of the oil tank and the fuel tank is provided with a tank cover provided rotatably as a fulcrum supporting member of the rotating frame side,
The fuel tank is provided with a notch portion comprising a bottom surface portion and a back surface portion rising from the back of the bottom surface portion by notching the upper position of the outer surface in an L shape,
The notch portion of the fuel tank includes a bottom plate facing the bottom portion of the notch portion, a back plate integrated with the bottom plate and facing the back portion of the notch portion, and a rear plate of the bottom plate. A tank fixing bracket formed by an end plate and a mounting plate that is integrated with a rear end of the back plate and faces the front surface of the hydraulic oil tank;
In the tank fixing bracket, the bottom plate is brought into contact with the bottom portion of the cutout portion, the back plate is brought into contact with the back portion of the cutout portion, and the mounting plate is attached to the front surface of the hydraulic oil tank. A small construction machine characterized in that the fuel tank is positioned by the above. The counterweight has an arc-shaped outer surface with a central portion in the left and right directions protruding rearward,
The upper swing body is provided with an arc-shaped side cover extending in an arc shape on the front side following the outer surface of the counterweight,
The outer surface of the fuel tank is formed in an arc shape along the facing arc-shaped side cover,
The small-sized construction machine according to claim 1, wherein the notch portion is formed by notching a rear portion of the arc-shaped outer surface of the fuel tank.   The tank fixing bracket is integrated with the rectangular bottom plate extending in the horizontal direction, the back plate rising from the back of the bottom plate, the rear end of the bottom plate, and the rear end of the back plate. 2. The small construction machine according to claim 1, wherein the construction machine is formed as a trihedron comprising the mounting plate rising from the rear end of the bottom plate. The tank cover is provided with a hook member located on the inner surface of the tank cover,
The small construction machine according to claim 1, wherein a catch member for releasably engaging the hook member is provided on the mounting plate of the tank fixing bracket.   2. The small construction machine according to claim 1, wherein the tank fixing bracket is provided so that the position of the tank fixing bracket can be adjusted in at least one of an upward, downward direction, a left direction, and a right direction with respect to the hydraulic oil tank.

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