JP4202982B2 - Working machine - Google Patents

Description

  The present invention relates to a work machine, and relates to a work machine in which a frame body is extended upward from a rear portion of a machine body and a fuel tank is attached to the frame body.

A working machine such as a tiller includes, for example, an engine that drives a working device, and a fuel tank for supplying fuel to the engine (see, for example, Patent Document 1).
JP 2003-260943 A

Patent document 1 is demonstrated based on the following figure.
FIG. 10 is a diagram for explaining a conventional basic configuration.
The work implement includes left and right receiving stays 200 and 201 at the upper part of the traveling gear case, and a U-shaped groove 202 is formed at the distal end portion of the left receiving stay 200 and a U-shaped groove 203 is formed at the distal end portion of the right receiving stay 201. The left and right side walls 206 and 207 of the fuel tank 205 are respectively provided with left and right protruding portions 208 (the right protruding portion is not shown), the upper end of the left protruding portion 208 is provided with an upper protruding portion 209, and a right protruding portion is provided. An upper protrusion (not shown) is provided at the upper end of the part.

The left protruding portion 208 is inserted into the U-shaped groove 202 of the left receiving stay 200 from above as indicated by an arrow, and the upper protruding portion 209 of the left protruding portion 208 is placed on the upper end of the U-shaped groove 202.
At the same time, a right protruding portion (not shown) is inserted into the U-shaped groove 203 of the right receiving stay 201 from above as indicated by an arrow, and the upper protruding portion (not shown) of the right protruding portion is inserted into the upper end of the U-shaped groove 203. Put it on.

  As described above, the fuel tank 205 is attached to the left and right receiving stays 200 and 201 simply by inserting the left and right left protruding portions 208 into the U-shaped grooves 202 and 203 of the left and right receiving stays 200 and 201. Can be attached to the fuselage side relatively easily.

  By the way, it is conceivable that the left and right receiving stays 200 and 201 vibrate in the vertical direction during work of the work implement. If the left and right receiving stays 200 and 201 vibrate in the vertical direction, the left and right left protruding portions 208 may move upward from the U-shaped grooves 202 and 203 of the left and right receiving stays 200 and 201, and the fuel tank 205 may be lifted. is there.

  An object of the present invention is to provide a working machine capable of easily and reliably attaching a fuel tank to a frame on the machine body side.

According to the first aspect of the present invention, in the working machine that extends the frame body 60 upward from the rear part of the machine body, attaches the fuel tank 25 to the frame body 60 , and supplies fuel from the fuel tank 25 to the engine 11 , the fuel tank 25, is formed in a substantially rectangular shape in horizontal as viewed from the front, of the fuel tank 25, above one of the pair of corners on the diagonal line, the plate-like upper mounting portion 81 mountable to the frame 60 A plate-like lower attachment portion 82 that can be attached to the frame body 60 is provided to project from the bottom of the other pair of diagonal corners of the fuel tank 25, and the bottom of the fuel tank 25. in, in vicinity of the corner portions of the opposite side of the lower mounting portion 82, the in the vicinity below the upper mounting portion 81, provided so as to droop projecting protrusions 86 protruding downward, one said frame member 60 In the upper part on the side, the fuel tank 25 An upper mounting bracket 42 for mounting and supporting the upper mounting portion 81 is provided. The upper mounting bracket 42 includes a mounting hole, and a lower mounting portion 82 of the fuel tank 25 is provided at a lower portion on the opposite side of the frame body 60. A lower mounting bracket 44 for mounting and supporting is provided. The lower mounting bracket 44 is provided with a mounting hole having a long hole, and is substantially the same height as the lower mounting bracket 44 below the upper mounting bracket 42 side of the frame body 60. The lower mounting bracket 43 provided with a fitting groove 58 that extends toward the inner side in the body width direction and opens in the direction of the lower mounting bracket 44 is provided in the portion of the vertical position. The fitting bracket 58 is inserted into the fitting groove 58 via the rubber member 93, and the lower mounting portion 82 is attached to the long hole of the lower mounting bracket 44 with the bolt 99 via the rubber member 92. Rutotomoni, characterized in that to attach the upper mounting bracket 42 to the upper mounting portion 81 via a rubber member 91.

Upper and lower mounting portions were formed at a pair of corners on a diagonal line, and protrusions were provided near the corners on the opposite side of the lower mounting portion.
When attaching the fuel tank, first, the protrusion is inserted into the fitting portion provided on the frame body side, and then the upper and lower attachment portions are fixed to the frame body side with fastening members. As described above, the fuel tank can be easily attached to the frame body side only by fixing the upper and lower attachment portions, that is, only two places, to the frame body side with the fastening member.

Furthermore, the fuel tank is supported at three points, that is, the upper and lower mounting portions and the protruding portion, by inserting the protruding portion into the fitting portion provided on the frame body side.
Therefore, the fuel tank can be securely attached to the frame body side, and the fuel tank can be maintained in a normal posture even when vibration is transmitted from the frame body side to the fuel tank.

In a second aspect of the present invention, in the first aspect of the present invention, the connection portion 87 of the fuel supply flow path 88 for supplying fuel to the engine 11 is provided in the vicinity of the protrusion portion 86. Thus, a concave portion 101 for precipitating dust in the fuel tank 25 is provided at a portion corresponding to the top of the projection 86 .

By providing the fuel supply channel in the vicinity of the corner portion where the protrusion is provided, the lower mounting portion is provided on the opposite side of the fuel supply channel.
Therefore, when the lower mounting portion is fixed to the frame body side with the fastening member, the fuel supply flow path does not hinder the work. Thereby, a lower attachment part can be easily fixed to the frame side with a fastening member.
In addition, in the vicinity of the fuel supply portion that supplies fuel to the engine, dust in the fuel tank can be precipitated by a recess provided in a portion corresponding to the top of the protrusion.

  In the invention according to claim 1, the upper and lower attachment portions are fixed to the frame body side with the fastening member, so that the fuel tank can be easily attached to the frame body side, and the protrusion is inserted into the fitting portion on the frame body side. Thus, there is an advantage that the fuel tank can be securely attached to the frame body side.

  In the invention according to claim 2, when the lower mounting portion is fixed to the frame body side with the fastening member, the fuel tank is more easily attached to the frame body side by arranging the fuel supply flow path so as not to hinder the work. There is an advantage that you can.

The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. “Front”, “Rear”, “Left”, “Right”, “Up”, “Down” follow the direction seen from the driver, Fr is front, Rr is rear, L is left, R is right Indicates.
In the present embodiment, a front rotary working machine is described as an example of a working machine, but the working machine is not limited to this.

FIG. 1 is a side view showing a front rotary working machine according to the present invention, and FIG. 2 is a plan view showing the front rotary working machine according to the present invention.
A front rotary work machine 10 as a work machine is provided with a transmission case 12 that also serves as a machine body at a lower part of an engine 11, a work drive shaft 13 is provided at a front portion 12 a of the transmission case 12, and a rotary work is provided on the work drive shaft 13. 15, a traveling drive shaft 14 is provided at the rear portion 12 b of the transmission case 12, left and right traveling wheels 16 are disposed at the left and right ends of the traveling drive shaft 14, and the rotary working unit 15 and the left and right traveling wheels 16 are connected by the engine 11. It is a walking self-propelled cultivator (management machine).

  The engine 11 is a so-called vertical engine in which the crankshaft 11a extends substantially vertically.

Further, the front rotary working machine 10 is attached with a traveling auxiliary wheel 22 so that its position can be adjusted up and down via a support mechanism 21 extending forward from the front part 12 a of the transmission case 12, and a rear part 12 b of the transmission case (machine body) 12. The stay 41 is extended upward from the upper end of the stay 41 and the handle 23 is extended rearward and upward from the upper end of the stay 41. The stay 41 is provided with an upper mounting bracket 42 and left and right lower mounting brackets 43 and 44 (see FIG. 3). The fuel tank mounting structure 40 is provided in the bracket 42 and the left and right lower mounting brackets 43 and 44 so that fuel can be supplied from the fuel tank 25 to the engine 11.
The upper mounting bracket 42 is provided in an upper part on one side of the frame body 60, and the lower mounting bracket 44 is provided in a lower part than the bracket 42 on the other side (opposite side) of the frame body 60.
The stay 41, the upper mounting bracket 42, and the left and right lower mounting brackets 43 and 44 constitute a frame body 60.

  Further, the front rotary working machine 10 extends the shift lever 33 rearward from the rear portion 12b of the transmission case 12, and operates a transmission (not shown) with the shift lever 33, whereby the rotary working unit 15 and the traveling wheels are operated. 16 operating states are adjusted.

  In FIG. 1, 24 is an air cleaner that purifies air supplied to the engine 11, 25 is a fuel tank that stores fuel supplied to the engine 11, 26 is a fuel tank 25 fuel port cap of the fuel tank 25, and 27 is the engine 11. An engine cover 28 covers the front of the transmission case 12 and a fender covering the upper portion of the rotary working unit 15. A body guard 29 protects the transmission case 12 and the like.

  In FIG. 2, 31 is a power switch for controlling on / off of a power source (not shown), 32 is a clutch lever for controlling on / off of a clutch 46 (see FIG. 3), and 34 is for starting the engine 11 manually. The recoil starter knob 35 is a throttle lever that adjusts the rotation of the engine 11.

FIG. 3 is a perspective view showing a fuel tank mounting structure for a front rotary working machine according to the present invention, and FIG. 4 is an exploded perspective view showing a fuel tank mounting structure for a front rotary working machine according to the present invention.
The fuel tank attachment structure 40 is a structure for attaching the fuel tank 25 to the frame body 60.
The stay 41 of the frame 60 extends from the transmission case (main body) 12 (see FIG. 1) with the left and right stay rods 47 and 48 extending upward and parallel to each other. The upper end portions 47 a and 48 a are connected to each other by the connecting portion 49 to form a substantially inverted U shape. The support column 50 is erected from the central portion of the connecting portion 49, and the handle 23 extends backward from the upper end portion of the support column 50.

An upper mounting bracket 42 is provided at the connecting portion 49, a lower left mounting bracket 43 is provided near the upper end portion 47 a of the left stay rod 47, and a lower right mounting bracket 44 is provided near the upper end portion 48 a of the right stay rod 48.
The upper mounting bracket 42 of the frame 60 attaches the base 51 to the connecting portion 49, extends the left leg portion 52 from the left end portion of the base 51 toward the front, and the right leg portion 53 toward the front from the right end portion of the base 51. The upper attachment piece 55 is provided at the front end portion 52 a of the left leg portion 52, and the welding nut 56 is attached to the back surface of the upper attachment piece 55.

The lower left mounting bracket 43 of the frame body 60 is disposed below the left leg portion 52, the base end portion 43a is attached to the vicinity of the upper end portion 47a of the left stay rod 47, and the fitting groove (fitting portion) 58 is formed in the distal end portion 43b. Is provided.
Specifically, the lower left mounting bracket 43 has the outer support piece 61 arranged in the vertical direction, a mounting piece 62 provided at the base end portion of the outer support piece 61, and horizontal from the lower end portion of the outer support piece 61 toward the inner side. The support piece 63 is extended, the inner support piece 64 is extended upward from the inner end of the horizontal support piece 63, and the locking piece 65 is extended inward from the upper end portion of the inner support piece 64.

The attachment end 62, the base end portion of the horizontal support piece 63, and the base end portion of the inner support piece 64 are attached to the vicinity of the upper end portion 47a of the left stay rod 47, respectively. The mounting bracket 43 is firmly attached.
The lower left mounting bracket 43 has a substantially U-shaped cross section with the outer support piece 61, the horizontal support piece 63 and the inner support piece 64, and further extends the locking piece 65 inward from the upper end of the inner support piece 64. To ensure rigidity.

The locking piece 65 has an inner side 65c that is tapered so that the width gradually increases from the base end portion 65a toward the tip end portion 65b, and includes a fitting groove 58 in the tip end portion 65b.
The fitting groove 58 is a groove extending toward the inner side in the body width direction and opening to the inner side 65c.
A substantially L-shaped attachment piece 67 is formed at the distal end portion 65 b of the locking piece 65, and an attachment hole 67 a is formed in the attachment piece 67.

The lower right mounting bracket 44 of the frame 60 is disposed below the right leg 53, the base end 44a is mounted near the upper end 48a of the right stay rod 48, the lower mounting piece 68 is provided at the distal end 44b, A welding nut 69 is attached to the back surface of the attachment piece 68.
Specifically, the lower right mounting bracket 44 has the outer support piece 71 arranged in the vertical direction, the attachment piece 72 is provided at the base end portion of the outer support piece 71, and the lower end portion of the outer support piece 71 faces inward. The horizontal support piece 73 is extended, a lower attachment piece 68 is provided at the tip of the horizontal support piece 73, a welding nut 69 is attached to the back surface of the lower attachment piece 68, and the inner support piece is directed downward from the inner end of the horizontal support piece 73. 74 is extended.

By attaching the attachment end 72, the base end portion of the horizontal support piece 73, and the base end portion of the inner support piece 74 to the vicinity of the upper end portion of the right stay rod 48, respectively, The mounting bracket 44 is firmly attached.
Further, the lower right mounting bracket 44 ensures rigidity by forming a substantially crank-shaped cross section with the outer support piece 71, the horizontal support piece 73 and the inner support piece 74.

Fuel tank 25 is a member formed in a horizontally long substantially rectangular shape in front view (see also FIG. 5), the fuel supply port 77 provided in the upper portion 76, detachably attached to the fuel filler opening cap 26 to the filler opening 77, the diagonal A pair of upper corners 78 and 79 (see also FIG. 5 for reference numeral 79) is provided with a plate-like upper mounting portion 81 that can be mounted on the upper mounting piece (frame body ) 55 so as to protrude upward, A plate-like lower attachment portion 82 (see also FIG. 5) that can be attached to the attachment piece (frame body ) 68 is provided so as to protrude downward, in the vicinity of the corner 83 on the opposite side of the lower attachment portion 82 and at the bottom 84. (See also FIG. 5), the raised portion 85 is provided so as to protrude downward, a protrusion 86 protruding downward from the lower portion 85 a of the raised portion 85 is provided, and a connection portion 87 is provided on the outer wall 85 b of the raised portion 85. And connecting the fuel supply flow path 88 to the connecting portion 87 The fuel in the fuel tank 25 via a fuel supply passage 88 is obtained by adapted to be supplied to the engine 11 (see FIG. 1).
Accordingly, the upper mounting portion 81 and the lower mounting portion 82 are provided so as to protrude vertically on one side of the upper portion of the fuel tank 25 and the other side of the bottom portion so that one is higher and the other is lower. , Arranged on a diagonal line (see also FIG. 5).

The upper mounting portion 81 is a flat member having a substantially rectangular shape, and includes an upper mounting hole 81a at a substantially center, and the upper rubber member 91 is fitted into the upper mounting hole 81a.
The lower mounting portion 82 is a substantially triangular flat member (see also FIG. 5), and includes a lower mounting hole 82a at a substantially center, and the lower rubber member 92 is fitted into the lower mounting hole 82a. The lower mounting hole 82a is a long hole (see also FIG. 5).

  The protruding portion 86 is a member that protrudes downward from the raised portion 85 of the fuel tank 25 and fits the rubber member 93. The raised portion 85 is provided near the corner portion 83 on the opposite side of the lower mounting portion 82 at the bottom portion 84 of the fuel tank 25.

  The rubber member 93 is fitted into the projection 86, and the projection 86 fitted with the rubber member 93 is inserted into the fitting groove 58 of the lower left mounting bracket 43.

The upper rubber member 91 is fitted into the upper mounting hole 81 a of the upper mounting portion 81, and the rear end of the upper rubber member 91 is brought into contact with the upper mounting piece 55 of the upper mounting bracket 42. A flat washer 95 is applied to the front end of the upper rubber member 91, a bolt 96 is inserted into the flat washer 95 and the upper rubber member 91, and the bolt 96 protruding from the upper rubber member 91 is screwed to the welding nut 56.
The bolt 96 and the weld nut 56 constitute a fastening member 70.

The lower rubber member 92 is fitted into the lower mounting hole 82 a of the lower mounting portion 82, and the rear end of the lower rubber member 92 is brought into contact with the lower mounting piece 68 of the lower right mounting bracket 44. A flat washer 98 is applied to the lower rubber member 92, a bolt 99 is inserted into the flat washer 98 and the lower rubber member 92, and the bolt 99 protruding from the lower rubber member 92 is screwed to the welding nut 69.
The bolt 99 and the welding nut 69 constitute a fastening member 75.

  Accordingly, the upper attachment portion 81 is attached to the frame body 60 with the fastening member 70, and the lower attachment portion 82 is attached to the frame body 60 with the fastening member 75.

FIG. 5 is a front view showing a fuel tank mounting structure for a front rotary working machine according to the present invention.
The protrusion 86 is supported by the fitting groove 58 of the lower left mounting bracket 43 via the rubber member 93. The upper mounting portion 81 is supported by an upper mounting piece 55 (see also FIG. 4) via the upper rubber member 91. The lower mounting portion 82 is supported by a lower mounting piece 68 (see FIG. 4) via the lower rubber member 92.

As a result, the fuel tank 25 is supported at the three points of the upper and lower mounting portions 81 and 82 and the protrusion 86.
Therefore, even if the fuel tank 25 is securely attached to the fuselage side (that is, the upper mounting bracket 42 and the left and right lower mounting brackets 43 and 44) and vibration is transmitted from the fuselage side to the fuel tank 25, the fuel tank 25 is properly Can be kept in the posture.

The fuel tank 25 is provided with a raised portion 85 in the vicinity of the corner 83 on the opposite side of the lower mounting portion 82 and on the bottom portion 84, and provided with a protruding portion 86 protruding downward from the lower portion 85 a of the raised portion 85. A connecting portion 87 is provided on the outer wall 85b of the 85.
By connecting the fuel supply flow path 88 to the connecting portion 87, the fuel in the fuel tank 25 is supplied to the engine (see FIG. 1) via the fuel supply flow path 88.

Here, the protrusion 86 will be described.
That is, the fuel tank 25, in order to precipitate dust in the fuel tank 25, to form a recess 101 in the portion corresponding to the inner bottom of the fuel tank of the raised portion 85 of the bottom 84. In order to form the recess 101 in the raised portion 85 of the bottom portion 84, it is necessary to project a protrusion downward from the lower portion 85b of the raised portion 85.

Therefore, the recess 101 is formed on the top 86a of the protrusion 86. Thereby, it is not necessary to provide the protrusion for forming the recessed part 101 in the raised part 85 separately.
Thus, since it is not necessary to provide two protrusions in the protrusion part 86, there is no possibility that design freedom and productivity may be impaired.

FIG. 6 is a cross-sectional view for explaining the upper mounting portion and the protruding portion of the fuel tank mounting structure according to the present invention.
The upper rubber member 91 is fitted into the upper mounting hole 81a of the upper mounting portion 81 so that the front flange 91a of the upper rubber member 91 protrudes to the front wall side of the upper mounting portion 81, and the rear flange 91b of the upper rubber member 91 is mounted on the upper side. Projecting to the rear wall side of the portion 81.
The rear flange 91b is applied to the upper mounting piece 55, the flat washer 95 is applied to the front flange 91a, the bolt 96 is inserted into the flat washer 95 and the upper rubber member 91, and the bolt 96 protruding from the upper rubber member 91 is screwed to the welding nut 56. Join.

The upper rubber member 91 is a cylindrical body that is formed of an elastic member that includes flanges 91a and 91b on the front and rear sides and a through hole 91c through which a threaded portion of the bolt 96 can be inserted.
The upper rubber member 91 absorbs vibration of the upper mounting bracket 42 by attaching the upper mounting portion 81 to the upper mounting piece 55 of the upper mounting bracket 42 via the upper rubber member 91.

The rubber member 93 is fitted into the protrusion 86 and the protrusion 86 is inserted into the fitting groove 58 of the lower left mounting bracket 43. By fitting the protrusion 86 into the fitting groove 58 of the lower left mounting bracket 43 via the rubber member 93, vibration of the lower left mounting bracket 43 is absorbed by the rubber member 93.
The rubber member 93 is a cylindrical body formed of an elastic member that can be fitted into the protrusion 86 and can be inserted into the fitting groove 58.

FIG. 7 is a cross-sectional view for explaining the upper mounting portion and the protruding portion of the fuel tank mounting structure according to the present invention.
The lower rubber member 92 is fitted into the lower mounting hole 82a of the lower mounting portion 82 so that the front flange 92a of the lower rubber member 92 protrudes to the front wall side of the lower mounting portion 82, and the rear flange 92b of the lower rubber member 92 is mounted downward. The part 82 is projected to the rear wall side.
The rear flange 92b is applied to the lower mounting piece 68, the flat washer 98 is applied to the front flange 92a, the bolt 99 is inserted into the flat washer 98 and the lower rubber member 92, and the bolt 99 protruding from the lower rubber member 92 is screwed to the welding nut 69. Join.

The lower rubber member 92 is a cylindrical body that is formed of an elastic member that includes flanges 92a and 92b on the front and rear sides and a through-hole 92c through which the threaded portion of the bolt 99 can be inserted.
The lower rubber member 92 absorbs the vibration of the lower mounting bracket 44 by attaching the lower mounting portion 82 to the lower mounting piece 68 of the lower right mounting bracket 44 via the lower rubber member 92.

Next, an attachment process for attaching the fuel tank 25 of the fuel tank of the front rotary work machine 10 to the machine body side (that is, the upper attachment bracket 42 and the left and right lower attachment brackets 43 and 44) will be described with reference to FIG.
FIGS. 8A and 8B are views for explaining the mounting process of the fuel tank mounting structure of the front rotary working machine according to the present invention.
In (a), the rubber member 93 is fitted into the protrusion 86, the upper rubber member 91 is fitted into the upper mounting hole 81a of the upper mounting portion 81, and the lower rubber member 92 is fitted into the lower mounting hole 82a of the lower mounting portion 82. Include.
Next, the protrusion 86 is inserted into the fitting groove 58 of the lower left mounting bracket 43.

In (b), the upper mounting portion 81 is in contact with the upper mounting piece 55 of the upper mounting bracket 42 and the lower mounting portion 82 is in contact with the lower mounting piece 68 (see (a)) of the lower right mounting bracket 44.
Next, a flat washer 95 is applied to the upper rubber member 91, and a bolt 96 is inserted into the flat washer 95 and the upper rubber member 91. A bolt 96 protruding from the upper rubber member 91 is screwed to the welding nut 56.

Similarly, a flat washer 98 is applied to the lower rubber member 92, and a bolt 99 is inserted into the flat washer 98 and the lower rubber member 92. The bolt 99 protruding from the lower rubber member 92 is screwed to the welding nut 69 (see (a)).
As a result, the fuel tank 25 is attached to the stay 41 via the upper mounting bracket 42 and the left and right lower mounting brackets 43 and 44.

As described above, according to the fuel tank mounting structure 40, first, the protrusion 86 is inserted into the fitting groove 58 of the lower left mounting bracket 43, and then the upper and lower mounting portions 81 and 82 are respectively connected to the upper and lower mounting pieces 55. 68.
In this manner, the fuel tank 25 can be easily attached to the aircraft body by simply attaching the upper and lower attachment portions 81 and 82, that is, only two places, to the aircraft body with the bolts 96 and 99.

  Further, a lower mounting portion 82 is provided on the opposite side of the fuel supply flow path 88. Therefore, when attaching the lower attachment portion 82 to the machine body with the bolt 99, the fuel supply flow path 88 does not hinder the work. Thereby, the lower attachment part 82 can be easily attached to the body side with the bolt 99.

  Next, the reason why the protrusion 86 is supported by the fitting groove 58 of the lower left mounting bracket 43 via the rubber member 93 in the fuel tank mounting structure 40 of the front rotary working machine 10 will be described with reference to FIG. To do.

FIG. 9 is a view for explaining the reason why the protrusion is provided in the fuel tank mounting structure of the front rotary working machine according to the present invention.
Here, when attaching the fuel tank 25 to the airframe side, the upper attachment portion 81 is supported by the upper attachment piece 55 (see also FIG. 4) of the upper attachment bracket 42 via the upper rubber member 91, and the lower attachment portion. By simply supporting 82 with the lower mounting piece 68 (see FIG. 4) via the lower rubber member 92, when the vibration is transmitted from the fuselage side to the fuel tank 25, the fuel tank 25 is There is a risk of swinging in the direction (front-rear direction of the aircraft).

Accordingly, the fitting groove 58 shown in FIG. 4 is formed so as to extend toward the inner side in the body width direction and to open to the inner side 65c.
Then, the protrusion 86 is inserted into the fitting groove 58 from the opening of the inner side 65c and is fitted.
By directing the fitting groove 58 in the width direction of the fuselage, even when vibration is transmitted from the fuselage side to the fuel tank 25, the fitting groove 58 prevents the protrusion 86 from swinging in the front-rear direction of the fuselage. Keep in a normal posture.

  Furthermore, by opening the fitting groove 58 in the inner side 65c, the projection 86 can be easily inserted into the fitting groove 58 from the opening. Thereby, it becomes possible to attach the fuel tank 25 to the airframe side more easily.

  In the embodiment, the upper mounting portion 81 is provided at the upper left corner 78 of the fuel tank 25, the lower mounting portion 82 is provided at the lower right corner 79 of the fuel tank 25, and the opposite side of the lower mounting portion 82. Although an example in which the protrusion 86 is provided in the vicinity of the corner 83 of the fuel tank 25 is not limited to this, the upper mounting portion 81 is provided in the upper right corner of the fuel tank 25 and the lower left corner 83 of the fuel tank 25 is provided. The same effect can be obtained by providing the lower mounting portion 82 and providing the protrusion 86 in the vicinity of the corner 82 on the opposite side of the lower mounting portion 82.

  In the above embodiment, the bolts 96, 99 and nuts 56, 69 are described as examples of the fastening members. However, the fastening members such as clips are not limited to the bolts 96, 99, nuts 56, 69. However, the same effect can be obtained.

  Furthermore, in the said embodiment, although the fitting groove | channel 58 was demonstrated to the example as a fitting part which inserts the projection part 86, it is not restricted to this, For example, a fitting part can also be made into a fitting hole. .

  The present invention is suitable for application to a working machine in which a frame is extended upward from the rear part of the machine body and a fuel tank is attached to the frame body.

It is a side view which shows the front rotary working machine which concerns on this invention. It is a top view which shows the front rotary working machine which concerns on this invention. It is a perspective view which shows the fuel tank mounting structure of the front rotary working machine which concerns on this invention. It is a disassembled perspective view which shows the fuel tank mounting structure of the front rotary working machine which concerns on this invention. It is a front view which shows the fuel tank mounting structure of the front rotary working machine which concerns on this invention. It is sectional drawing explaining the upper attachment part and projection part of the fuel tank attachment structure which concern on this invention. It is sectional drawing explaining the upper attachment part and projection part of the fuel tank attachment structure which concern on this invention. It is a figure explaining the attachment process of the fuel tank attachment structure of the front rotary working machine which concerns on this invention. It is a figure explaining the reason which provided the projection part in the fuel tank mounting structure of the front rotary working machine which concerns on this invention. It is a figure explaining the conventional basic composition.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Front rotary work machine (work machine), 11 ... Engine, 12 ... Transmission case (machine body), 12b ... Rear part of transmission case (rear part of machine body), 25 ... Fuel tank, 40 ... Fuel tank mounting structure, 41 ... Stay , 56, 69 ... welding nut (the other of the fastening member), 58 ... fitting groove (fitting part), 60 ... frame, 70, 75 ... fastening member, 78, 79, 83 ... corner, 81 ... top mounting , 82 ... lower attachment part, 86 ... projection, 88 ... fuel supply flow path, 96, 99 ... bolt (one of the fastening members).

Claims (2)

The frame (60) from the rear of the machine body extending upward, a fuel tank (25) mounted on the frame (60), in the working machine for supplying fuel to the engine (11) from the fuel tank (25),
Said fuel tank (25), formed in a substantially rectangular shape in horizontal as viewed from the front,
The fuel tank (25), above one of the pair of corners on the diagonal line, projecting possible plate-like upper mounting portion (81) attached to said frame (60),
A plate-like lower attachment portion (82) that can be attached to the frame body (60) is provided to project from the bottom of the other corner of the pair of diagonal corners of the fuel tank (25),
A protrusion (86) projecting downward at the bottom of the fuel tank (25), in the vicinity of the corner opposite to the lower mounting portion (82) and in the vicinity of the lower position of the upper mounting portion (81). Provided so that it protrudes drooping ,
An upper mounting bracket (42) for mounting and supporting the upper mounting portion (81) of the fuel tank (25) is provided on an upper portion on one side of the frame (60), and the upper mounting bracket (42) With mounting holes,
A lower mounting bracket (44) for mounting and supporting a lower mounting portion (82) of the fuel tank (25) is provided at a lower portion on the opposite side of the frame (60). The lower mounting bracket (44) It has a mounting hole consisting of a long hole,
Below the upper mounting bracket (42) side of the frame body (60), a portion at substantially the same height position as the lower mounting bracket (44) extends inward in the body width direction, and extends inward in the body width direction. The lower mounting bracket (43) provided with a fitting groove (58) that opens in the direction of the lower mounting bracket (44) is provided.
The protrusion (86) is inserted into the fitting groove (58) of the lower mounting bracket (43) via the rubber member (93),
The lower attachment portion (82) is attached to the elongated hole of the lower attachment bracket (44) via a rubber member (92) with bolts (99), and the upper attachment portion (81) is attached to the upper portion via a rubber member (91). It was attached to the mounting bracket (42).
A working machine characterized by that . A connecting portion (87) of a fuel supply flow path (88) for supplying fuel to the engine (11) is provided in the vicinity of the protruding portion (86), and the connecting portion (87) is provided at the bottom of the fuel tank (25). in the vicinity of, the portion corresponding to the top portion of the protrusion portion (86), the working machine according to claim 1, characterized in that a recess (101) in order to precipitate dust in the fuel tank (25).

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