KR20050024434A - Internal combustion engine-driven working machine - Google Patents

Abstract

The internal combustion engine and the work engine driven by the internal combustion engine are arranged side by side in a substantially rectangular parallelepiped space enclosed by a protective frame, and have a flange that is substantially rectangular when viewed from the top and extends horizontally along the outer circumferential side thereof. In an internal combustion engine driven work machine in which a fuel tank is arranged and configured such that a flange of the fuel tank is supported between cross frames of the frame and supported by a cross member constituting a rectangular support frame, each of the four corners of the flange of the fuel tank is supported. Since the support member is formed to extend from the cross member, the support member is protruded at four corners of the rectangular support frame by the cross member, so that the support member is less constrained when inserting the fuel tank into the frame, thereby facilitating the attachment work. do.

Description

Internal combustion engine driven work machine {INTERNAL COMBUSTION ENGINE-DRIVEN WORKING MACHINE}

The present invention relates to an internal combustion engine drive working machine provided by protecting a frame with an internal combustion engine, a generator and a fuel tank driven by the internal combustion engine.

The internal combustion engine drive work machine in which the whole body is enclosed and protected by the frame has the frame structure which forms a frame simple and easy to handle, and is widely used for outdoor work.

And in order to make continuous operation time long and suitable for outdoor work, it is common to install a large fuel tank using the upper space of an internal combustion engine and a generator.

In such a large fuel tank, the weight at the time of fullness of fuel is large, and as disclosed in Japanese Patent Laid-Open No. 4-111530, the flange portion of the fuel tank is fixed on the fuel tank support frame.

In the example of this publication, since it does not have a protective frame which protects the upper surface of a fuel tank, it can attach so that a fuel tank may be lowered on a fuel tank support frame from the upper side, but the protective frame which protects the upper surface of a fuel tank is framed. If it is formed in the fuel tank, the fuel tank cannot be attached to the housing from above.

Thus, in the example described in Japanese Patent Laid-Open No. 10-169891, the fuel tank is inserted horizontally from the side to the upper space of the frame below the protective frame protecting the upper surface of the fuel tank, and the insertion direction is left and right. Direction, the front and rear flanges of the fuel tank are supported by the front and rear support frames oriented in the left and right directions.

In the embodiment, the rear support frame is extended inward over the entire left and right widths, and the support bracket protrudes inward from the front support frame, and the front and rear support brackets of the fuel tank are extended by the extended support bracket and the front support bracket. The flange portion is supported.

Therefore, although the extension part of the rear support frame which protruded inward and the front support bracket can be used for the weight support of an insertion process, the insertion space of a fuel tank becomes narrow front and rear width over the whole left and right widths, Insertion must be made with care in order to avoid interference in this narrow space, which may result in time consuming work.

1 is an overall front view of an internal combustion engine drive generator according to an embodiment of the present invention;

2 is a left side view of the internal combustion engine driven generator,

3 is a right side view of the internal combustion engine driven generator,

4 is a plan view of the internal combustion engine driven generator,

5 is a perspective view of the internal combustion engine drive generator,

6 is an exploded perspective view of the frame and the fuel tank;

7 is a plan view of the internal combustion engine drive generator cut horizontally the upper portion of the frame;

8 is a cross-sectional view taken along the line VII-VII of FIG. 7;

9 is a plan view in which the upper portion of the frame is horizontally cut in the internal combustion engine drive generator according to another embodiment;

10 is a cross-sectional view taken along the line VII-VII of FIG. 9;

FIG. 11 is a cross-sectional view taken along the line VI-XI of FIG. 10;

12 is a plan view in which an upper portion of a frame is cut horizontally in an internal combustion engine drive generator according to still another embodiment;

13 is a cross-sectional view taken along the line XIII-XIII of FIG. 12;

14 is a cross-sectional view taken along the line VII-VII of FIG. 12;

15 is an exploded perspective view of an internal combustion engine drive generator according to another embodiment.

The present invention has been made in view of such a point, and its object is to provide a small amount of constraints when inserting the fuel tank into a space in which the fuel tank protection member for protecting the upper surface of the fuel tank is installed. The present invention provides an internal combustion engine driven work machine that is easy to work with.

In order to achieve the above object, the present invention is an internal combustion engine and a work machine driven by the internal combustion engine are arranged side by side in a substantially rectangular parallelepiped space surrounded by a protective frame, which is substantially rectangular in shape and viewed from above on the upper side. A fuel tank having a flange extending in a horizontal direction along a side thereof is disposed, wherein the flange of the fuel tank is hypothesized to be supported by a cross member constituting a rectangular support frame between the longitudinal frames of the frame. The fuel tank protection member is provided at an upper portion of the fuel tank, and support members each supporting four corners of the flange of the fuel tank extend from the cross member, and the fuel tank is disposed below the fuel tank protection member. Inserted into the space from the side so that the four edges of the flange An internal combustion engine drive work machine configured to be supported and attached to the support member.

The support members extending from the cross members respectively support the four corners of the flange of the fuel tank, so that they are protrudingly installed at the four corners of the rectangular support frame by the cross members, thus limiting the support members when inserting the fuel tank into the frame. There is little thing to do and it is easy to attach work.

The number of parts can be reduced by providing the mounting support part which mounts and supports the fuel tank on the same support member.

The support member extends inward from the left and right cross members oriented in the front-rear direction when the fuel tank is inserted in the left-right direction, so that there is no protruding member that is restricted before and after the fuel tank is inserted into the frame. To facilitate.

At least one of the mounting support and the stationary support of the support member is supported on the flange of the fuel tank and supported on the line segment which is approximately the shortest of the tangential tangents in contact with the edge of the main body of the fuel tank, thereby supporting the edge of the flange of the flange. In spite of negative support, large support strength can be obtained.

In addition, by separately placing the support member for mounting the fuel tank and the fixing support member for fixedly supporting the fuel tank, it is possible to reduce both of the supporting members and to restrict the support member when inserting the fuel tank into the frame. To facilitate attachment work.

The mounting support members are respectively formed inwardly extending from the front and rear cross members oriented in the left and right directions when the fuel tank is inserted into the left and right directions. Since the fuel tank can be kept horizontal, subsequent work is easy and the workability is good.

The fixing support member is formed to extend inwardly from the left and right cross members oriented in the front-rear direction when the insertion direction of the fuel tank is in the left-right direction among the cross members, thereby fixing and supporting the flange of the fuel tank at four corners. It is easily possible.

By forming the fixing flange supported by the fixing support member by expanding the front flange portion and the rear flange portion in the fuel tank insertion direction, the fuel tank is moved from the left and right sides to the frame even when the fixing flange is enlarged. There is no obstruction when inserting, and it becomes possible to enlarge a fuel tank capacity and to ensure large support strength.

At least a mounting support member of the mounting support member and the fixing support member is supported on a fuel segment by supporting it on a line segment which is on the flange of the fuel tank and which is approximately the shortest of the tangential tangential to the edge of the main body of the fuel tank. Despite supporting the edges of the flanges, a large support strength can be obtained.

Further, among the left and right cross members oriented in the front-rear direction when the insertion direction of the fuel tank is in the left-right direction, the cross member behind the insertion direction is detachable, and the detachable cross member is inserted into the attachment space. The fuel tank is inserted by inserting the fuel tank from the opening of the removed frame and installing the detachable cross member detached after the insertion by installing the fuel tank detachably and detachably. Attachment can be performed easily.

At least three corners of the flange when the fuel tank is inserted into the frame by forming a support member extending from an end close to the detachable cross member of at least one cross member of the front and rear cross member which is oriented in the left and right direction among the cross members. Since the furnace fuel tank is supported and the fuel tank is maintained in a horizontal posture, subsequent installation of the detachable cross member can be easily performed and workability is good.

EMBODIMENT OF THE INVENTION Hereinafter, one Embodiment which concerns on this invention is described based on FIG.

This embodiment is applied to the internal combustion engine drive generator 1 whose working machine is a generator.

The front view of the whole internal combustion engine drive generator 1 is shown in FIG. 1, the left side view, FIG. 2, the right side view, FIG. 3, the top view, and FIG.

In the front view of Fig. 1, the front side of the page is before and after, and the left side is left and right.

The frame 20 surrounds and protects the entire body, and the generator 3 in which the internal combustion engine 2 is directly connected to the left side and the rotation shaft is directly connected to the output shaft of the internal combustion engine 2 in the frame 20 is right. The fuel tank 4 which is arrange | positioned at the rectangular shape as seen from the upper surface in the space above the internal combustion engine 2 and the generator 3 is suspended.

The recoil starter 10 is installed at the left end of the internal combustion engine 2, and the air cleaner 11 is installed at the rear position of the recoil starter 10, and between the air cleaner 11 and the cylinder of the internal combustion engine, Intake machine apparatuses, such as an intake pipe, are provided.

Behind the generator 3, an exhaust system device such as an exhaust pipe or a muffler 40 is provided.

The fuel tank 4 is a flat rectangular tank, and a flange 5 extending in the horizontal direction along the outer circumferential side is formed over the circumferential direction, the inner surface area of the height position of the flange 5 is the largest, and the flange ( 5) The inner area gradually decreases as it goes upwards and downwards.

Moreover, the attachment hole 5a is formed in the four corners of the flange 5 of the fuel tank 4.

There is a fuel supply port at an approximately center position of the upper surface of the fuel tank 4, the fuel cap 6 is screwed, the fuel cock 7 protrudes downward from the position along the left edge of the lower surface, A fuel hose 8 extends from the fuel cock 7 located on the left outer side of the internal combustion engine 2 and is connected to the vaporizer.

As shown in FIG. 6, the frame 20 which surrounds and supports the above apparatus continues a pipe frame in a rectangular annular shape, bends the opposing elongate frame part to a c-shape, and forms the frame shape of a rectangular parallelepiped. Forming.

 That is, the frame 20 includes four front and rear horizontal frames 21F and 21R, which are oriented in the horizontal direction, and four vertical frames in which the left and right ends of the front and rear horizontal frames 21F and 21R are bent and extended upward. 22F, 22F, 22R and 22R, and a pair of left and right horizontal frames 23L and 23R which are oriented in the front-rear horizontal direction which connects the upper end of the vertical frames 22F and 22R opposing back and forth.

And between the left and right horizontal frames 23L and 23R, the protection frames 24F and 24R which were oriented in the left-right horizontal direction are hypothesized by welding two ends back and forth.

The front and rear pairs of protection frames 24F and 24R have a smaller distance from each other than the front and rear pairs of front and rear horizontal frames 21F and 21R, and as shown in FIGS. 4 and 5, Located above, it has a function to reinforce the frame 20 and to protect the upper surface of the fuel tank 4.

One pair of base support plates 25L and 25R are installed between left and right front and rear pairs of front and rear horizontal frames 21F and 21R, and the internal combustion is mounted on the base support plates 25L and 25R through the mounting member 26. The engine 2 and the generator 3 are supported.

Between the left and right pair of front vertical frames 22F and 22F and between the rear vertical frames 22R and 22R of the frame 20, the front and rear pairs of front and rear cross members 27F and 27R are oriented in the horizontal direction in the horizontal direction. Is hypothesized.

The front and rear cross members 27F and 27R have a rectangular cylindrical shape.

The control panel 41 which arrange | positioned an output outlet, various operation switches, etc. is attached to the front surface of the front cross member 27F.

Further, between the front and rear vertical frames 22F and 22R on the right side of the frame 20, a rectangular cylindrical right cross member 28R is hypothesized at the same predetermined height in the front and rear horizontal direction.

The support brackets 29 and 29 which support the fuel tank 4, respectively, protrude toward the inside from both ends of the inner surface of the right cross member 28R.

On the other hand, the left cross member 28L paired opposite to the right cross member 28R is formed symmetrically with the right cross member 28R, and the support brackets 29 and 29 protrude inwardly in both ends of the inner surface. Although this left cross member 28L is attached to and detached from the frame 20, it is provided.

The left and right vertical frames 22F and 22R on which the left cross member 28L is installed are provided with attachment brackets 30 and 30 at a predetermined height, and the left cross member is attached to the attachment brackets 30 and 30. Both ends of the 28L are abutted and screwed by the bolts 31 and 31 to be attached to the right and left cross members 28R in a symmetrical position.

Thus, the left and right cross members 28L and 28R form a fuel tank support frame, and the support brackets 29 of the four corners protruding from both ends of the left and right cross members 28L and 28R are respectively connected to the fuel tank 4. The flange 5 is mounted.

The support bracket 29 has a shape in which the horizontal plate portion 29h and the vertical plate portion 29v are bent at right angles with reference to FIGS. 6 to 8, and are welded and fixed to the left and right cross members 28L and 28R. Compared to the base side, the tip side is somewhat narrower in width.

The bolt hole 29a is formed in the base end side of the horizontal board part 29h, The nut 32 is fixed to this bolt hole 29a in the back surface of the horizontal board part 29h, and the elastic support body is fitted in the fitting hole in the front end side. 33) is fitted.

On the other hand, in the attachment hole 5a formed in the four corners of the flange 5 in the fuel tank 4, the support grommets 34 which have elasticity in which the cylindrical collar 35 was inserted in the center are fitted, respectively. do.

Therefore, when the four corner portions of the flange 5 of the fuel tank 4 are placed on the support bracket 29 protruding from the four corners of the frame 20, the support bracket is supported through the elastic support 33 and the support grommets 34. The bolt 37 is supported by the collar 29 and the collar 35 inserted into the supporting grommet 34 of the flange 5 and the bolt hole 29a of the supporting bracket 29 as shown in FIG. It penetrates and attaches to the nut 32 fixed to the back surface of the horizontal board part 29h.

The work order for attaching the fuel tank 4 to the frame 20 is to first move the fuel tank 4 from the left opening of the frame 20 from which the detachable left cross member 28L is removed. The front and rear ends of the front end flange portion in the insertion direction are mounted on the front and rear support brackets 29 and 29 protruding from the right cross member 28R, with the side opposite to the provided side in the substantially horizontal posture.

Subsequently, the left cross member 28L is hypothesized to the left vertical frames 22F and 22R, and the front and rear ends of the rear flange portion are placed on the front and rear support brackets 29 and 29 protruding from the left cross member 28L. Support 4).

The four corners of the flange 5 of the fuel tank 4 are fixed through the support grommets 34 by bolts 37.

Since the frame 20 is provided with protective frames 24F and 24R on the upper side of the fuel tank 4, the fuel tank 4 cannot be mounted in the frame 20 from the upper side. By inserting the fuel tank 4 from the side in the frame 20 as described above, the fuel tank 4 can be inserted and attached even when the internal combustion engine 2 and the generator 3 are mounted and supported in the frame 20. . ·

In addition, the fuel cock 7 protruding from the lower surface of the fuel tank 4 does not interfere with the internal combustion engine 2 at the time of insertion as mentioned above at the left side.

Therefore, at the time of insertion of the fuel tank 4, there is no protruding inward in the way of the insertion in the space between the front and rear cross members 27F and 27R corresponding to the passage into which the fuel tank 4 is inserted. Insertion of the fuel tank 4 is performed easily, and an attachment operation is performed smoothly.

Moreover, although the attachment brackets 30 and 30 protrude in the left opening of the frame 20 from which the front-back left cross member 28L was removed, the protrusion amount is small and the flange 5 of the fuel tank 4 is By inserting it through the attachment brackets 30 and 30, it is hardly disturbed.

In addition, this protrusion can be eliminated by forming the attachment brackets 30 and 30 directly on the vertical frames 22F and 22R.

As described above, when the fuel tank 4 is inserted into the frame 20 and supported by the support bracket 29 protruding at four corners, as shown in FIG. 7, the mounting support point P by the elastic support 33 is shown. Is located on the line segment t (broken line shown in FIG. 7) which is on the flange 5 of the fuel tank 4 and becomes the shortest of the virtual tangential lines which contact the edges of the fuel tank main body 4a.

Therefore, high strength can also be obtained with respect to the force in the bending direction acting on the flange 5.

In other words, the attachment structure of the fuel tank 4 is to support the heavy fuel tank 4 at the four corners of the flange 5, and by supporting it at the mounting support point P of the flange 5, sufficient support strength is achieved. It can be secured.

Next, another embodiment will be described based on FIGS. 9 to 11.

In the internal combustion engine drive generator according to the present embodiment, the frame body and the fuel tank are the same as the frame body 20 and the fuel tank 4 of the above embodiment, and therefore the same reference numerals are used.

In this embodiment, the mounting support bracket 50 protrudes inward from the front-back cross member 27F, 27R in four corners in the frame 20, and is fixedly supported inward from the left and right cross members 28L, 28R. The bracket 51 protrudes.

The mounting support bracket 50 is composed of a rectangular horizontal plate portion 50h and triangular vertical plate portions 50v and 50v which are bent downward from both edges thereof, and as shown in FIG. It is welded and fixed to 27F, 27R, and the elastic support body 52 is fitted in the fitting hole of the horizontal board part 50h.

On the other hand, the fixed support bracket 51 also consists of a rectangular horizontal plate part 51h and triangular vertical plate parts 51v and 51v bent downward from both edges thereof, and as shown in FIG. It is welded and fixed to 28L and 28R, has a bolt hole in the horizontal plate part 51h, and the nut 53 is fixed to the back surface.

The attachment structure of the flange 5 of the fuel tank 4 to this fixed support bracket 51 is the same as that of the said embodiment, and is shown in FIG. 11 using the same code | symbol.

And the position of the elastic support body 52 of the mounting support bracket 50, and the position of the bolt hole of the fixed support bracket 51 are also the same as the said embodiment.

Therefore, also in this embodiment, as shown in FIG. 9, the mounting support point P by the elastic support body 52 is on the flange 5 of the fuel tank 4, and is the edge part of the fuel tank main body 4a. It is located on the line segment t which becomes the shortest among the virtual tangential which contact | connects and it can ensure sufficient support strength with respect to the support of the fuel tank 4.

And the insertion of the fuel tank 4 into the frame 20 is also the same as the above embodiment, and the fuel tank 4 is inserted in the horizontal position from the left opening of the frame 20 from which the left cross member 28L is removed. The four corner portions of the flange 5 are mounted on four mounting support brackets 50 protruding from the front and rear cross members 27F and 27R to support the fuel tank 4, and then the left cross member 28L is left. It hypothesizes to the vertical frames 22F and 22R.

The front and rear cross members 27F and 27R corresponding to the passages through which the fuel tank 4 is inserted at the time of insertion of the fuel tank 4 are placed on the inside (right end) and the front (left end) in the insertion direction. ) Is slightly protruded, but since there is no protruding inwardly in the insertion space therebetween, the fuel tank 4 is easily inserted and the attachment work is performed smoothly.

Moreover, since the mounting support bracket 50 of the front (left end part) is located in the vicinity of the insertion opening, the flange 5 of the fuel tank 4 is made of the mounting support bracket 50 similarly to the said attachment bracket 30. By inserting through the stomach, it is possible to easily insert the fuel tank 4.

Another embodiment will be described based on FIGS. 12 to 14.

The internal combustion engine drive generator which concerns on this embodiment uses the same code | symbol because the frame main body is the same as the frame 20 of the said embodiment.

The fuel tank 70 has a shape substantially the same as that of the fuel tank 4, but the flange 71 is slightly different, and the fixing in which the fuel tank 70 swells the predetermined front and rear portions of the front end (right) flange portion 71R in the insertion direction. Fixing flanges 72L and 72L in which predetermined front and rear predetermined portions of the flanges 72R and 72R and the rear end (left) flange portion 71L are expanded.

On the other hand, in the frame 20, the mounting support bracket 73 protrudes inward from the front-back cross member 27F, 27R in four corners, and the fixed support bracket 74 is fixed inward from the left and right cross members 28L, 28R. This protrusion is installed.

The mounting support bracket 73 is composed of a rectangular horizontal plate portion 73h and triangular vertical plate portions 73v and 73v that are bent downward from both edges thereof, and as shown in FIG. It is welded and fixed to 27F, 27R, and the elastic support body 75 is fitted to the fitting hole of the horizontal board part 73h.

The fixed support bracket 74 also includes a rectangular horizontal plate portion 74h and triangular vertical plate portions 74v and 74v bent downward from both edges thereof, and as shown in FIG. It is welded and fixed to 28L and 28R, has a bolt hole in the horizontal board part 74h, and the nut 76 is fixed to the back surface.

In the case of this embodiment, the fixing position with respect to the front-back cross member 27F, 27R of the mounting support bracket 73 is the same as the embodiment shown in FIG. 9, The left-right cross member 28L, 28R) is different from each other in the position shown in FIG. 9, which is somewhat closer to each other, and the expanded fixing flanges 72R, 72L of the front and rear flange portions 71R, 71L of the fuel tank 70 are different. )

The attachment structure to the fixed support bracket 74 of the fixing flange 72R, 72L of the fuel tank 70 is the same as that of embodiment shown in FIG. 11, as shown in FIG. 14, and the same code | symbol in an attachment structure. Use

In the case of this embodiment, as shown in FIG. 14, a part of the fixing flanges 72R, 72L is mounted on the left and right cross members 28L, 28R via the support grommets 34.

And as shown in FIG. 12, the fixed support point Q by the fixing flange 72R, 72L is the flange 71 of the fuel tank 70 similarly to the mounting support point P by the mounting support bracket 73. As shown in FIG. It is located on the line segment t which is in the shortest of the imaginary tangents which are in contact with the edge part of the fuel tank main body 70a.

Therefore, greater support strength can be ensured with respect to the support of the fuel tank 70.

In the front and rear cross members 27F and 27R corresponding to the passages through which the fuel tank 4 is inserted at the time of insertion of the fuel tank 70, the inside (right end) and the front (left end) of the insertion direction are the same as in the above embodiment. Although the mounting support bracket 73 protrudes slightly, the insertion space therebetween does not protrude inwardly, which hinders the insertion. Therefore, the fuel tank 4 is easily inserted and the attachment work is performed smoothly. .

In addition, since the fixing flanges 72L, 72R formed by expanding to the flange 71 of the fuel tank 70 are inward and forward in the insertion direction, even if the protrusion amount of the fixing flanges 72L, 72R increases, the fuel tank ( The insertion of 70) is not hindered and the fuel tank capacity can be increased or the support strength on the flange side can be increased by increasing the amount of protrusion.

Next, another embodiment will be described based on FIG. 15.

Basically the same as the embodiment shown in FIG. 1 to FIG. 8 above, the removable left cross member 28L of the four support brackets 29 supporting the four corners of the flange 5 of some fuel tank 4. Of one of the support brackets 81 is provided with only the bolt holes 81a and does not include an elastic support 33 for mounting, and corresponds to the elastic support 33 for the rear cross member 27R. It is an elastic support 83 fitted to the mounting support bracket 82 protruding inwardly from the left part.

Since this point is different from the above embodiment, and the others are the same, the same member uses the same reference numeral.

In the operation of attaching the fuel tank 4 to the frame 20, the fuel cock 7 is provided with the fuel tank 4 from the left opening of the frame 20 from which the removable left cross member 28L is removed. The front and rear ends of the front end flange portion in the insertion direction are placed on the front and rear support brackets 29 and 29 protruding from the right cross member 28R, and the rear end is inserted in a substantially horizontal posture with the opposite side as the head. The rear side of the flange portion is placed on a mounting support bracket 82 protruding from the rear cross member 27R, and the fuel tank 4 can support three corners of the flange 5 to maintain a horizontal posture.

Therefore, when attaching the left cross member 28L, the left cross member 28L is placed along the support brackets 29 and 81 on the lower surface of the flange 5 of the fuel tank 4 in which the horizontal posture is maintained. 22F, 22R, and both ends of the left cross member 28L can be screwed to the attachment brackets 30 and 30 by the bolts 31 and 31, and can be constructed.

Since the fuel tank 4 is supported by the three corners of the flange 5 to maintain a horizontal posture, the operator installs the left cross member 28L while supporting the rear flange of the fuel tank 4 to maintain the horizontal posture. There is no need to do cumbersome work, and workability is good.

In addition, after the construction of the left cross member 28L, the fuel tank 4 is supported by the four corners of the flange 5 being fixed through the support grommets 34 by bolts 37.

The present invention is applied to an internal combustion engine drive work machine.

Claims (11)

The internal combustion engine and the work machine driven by the internal combustion engine are arranged side by side in a substantially rectangular parallelepiped space enclosed by a protective frame, and the upper side is formed with a flange that is substantially rectangular when viewed from the top and extends horizontally along the outer circumferential side thereof. In an internal combustion engine drive work machine, a fuel tank is arranged, the flange of the fuel tank is hypothesized across the vertical frame of the frame body to be supported by a cross member forming a rectangular support frame, A fuel tank protective member is installed on the upper portion of the fuel tank, Support members each supporting four corners of the flange of the fuel tank is formed extending from the cross member, And the fuel tank is inserted from the side into the lower space of the fuel tank protection member so that four corners of the flange are supported and attached to the support member. The internal combustion engine drive work machine according to claim 1, wherein each of the supporting members includes a mounting support for mounting and supporting the fuel tank on a same support member. The internal combustion engine drive work machine according to claim 2, wherein the support member extends inward from the left and right cross members oriented in the front-rear direction when the insertion direction of the fuel tank is made in the left-right direction among the cross members. 4. The support member according to claim 2 or 3, wherein at least one of the mounting support and the fixed support is on the flange of the fuel tank and is approximately the shortest of the virtual tangents in contact with an edge of the main body of the fuel tank. The internal combustion engine drive work machine characterized by supporting on a line segment. The internal combustion engine drive according to claim 1, wherein each of the supporting members is composed of a pair of supporting members which are separate from the supporting members for mounting and supporting the fuel tank. Working machine. The internal combustion engine according to claim 5, wherein the mounting support member extends inward from the front and rear cross members oriented in the left and right directions when the insertion direction of the fuel tank is made in the left and right directions among the cross members. Driven work machine. The said fixing support member is extended inwardly from the left and right cross members which were oriented in the front-back direction, when the insertion direction of the said fuel tank was made to the left-right direction among the said cross members, respectively. Internal combustion engine driven work machine. 8. The internal combustion engine drive work machine according to claim 7, wherein a fixing flange which is supported by the fixing support member by expanding the front flange portion and the rear flange portion in the insertion direction of the fuel tank is formed. 7. A virtual tangential line according to claim 5 or 6, wherein at least one of the mounting support members and the fixing support members is on a flange of the fuel tank and is in contact with an edge of the main body of the fuel tank. An internal combustion engine-driven work machine, which is supported on the shortest line segment. The cross member behind the insertion direction of the left and right cross members oriented in the front-rear direction when the insertion direction of the fuel tank is in the left-right direction becomes detachable, and the detachable cross member is formed in the fuel tank. And a hypothesis between the longitudinal frames after being inserted into an attachment space. 12. The internal combustion engine driven work machine according to claim 10, wherein the supporting member extends from an end close to the detachable cross member of at least one cross member of the front and rear cross member which is oriented in the left and right direction among the cross members.