JP3514697B2 - Fuel tank and molding method thereof - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a fuel tank and a method for molding the same.

[0002]

2. Description of the Related Art For example, in a backhoe, FIG.
As shown in FIG. 18, the traveling device is provided with a revolving base plate 101 that can revolve around a vertical axis, an engine is arranged at the rear part of the revolving base plate 101, and a fuel tank is provided on the left and right sides on the front side of the engine. There is an arrangement of 102. In this case, the fuel tank 102 is formed in a flat shape, and a groove-shaped band hooking portion 104 for fitting the band 103 is formed in the circumferential direction on the outer side surface of the fuel tank 102 in the left-right direction.

A band 103 which is applied to the outer side surface of the fuel tank 102 in the left-right direction in the front-rear direction, and a locking member 107 provided on the rear end side of the band 103,
The fixing means 109 mainly composed of the fastening tool 108 provided on the front end side of the band 103 is provided.
By tightening the nut 110 of the fuel tank 102, the fuel tank 102 is separated by the band 103.
The fuel tank 102 is fixed by being pressed against the fuel tank 2.

[0004]

By the way, the band hooking portion 104 formed on the side surface of the conventional fuel tank 102 formed in a flat shape has a groove shape, and the band hooking portion 10 is formed.
4, the first step portion 115 engaging one side in the width direction of the band 103 and the second step portion 116 engaging the other side in the width direction of the band 103 are arranged to face each other in the thickness direction of the fuel tank 102. Since it was formed, the mold for forming the fuel tank 102 is provided with the first split mold and the second split mold that face each other in the thickness direction (vertical direction) of the fuel tank 102. When the fuel tank is molded so as to form the banding portion 104 in the circumferential direction on the side surface of the fuel tank 102, the fuel tank 10 molded from the first split mold and the second split mold.
It becomes difficult to pull out 2.

For this reason, conventionally, a mold for forming the fuel tank 102 is provided with a first split mold and a second split mold that face each other in the width direction or the longitudinal direction of the fuel tank. With the split mold, the fuel tank 102 is formed so as to form the banding portion 104 in the circumferential direction on the side surface of the fuel tank 102. Therefore, the first split mold and the second split mold have a deep shape. However, there is a problem that the mold becomes complicated, the manufacturing of the fuel tank 102 is troublesome, and the manufacturing cost becomes high. In view of the above problems, the present invention is intended to enable a flat fuel tank to be manufactured easily and inexpensively with a mold having a structure as simple as possible.

[0006]

Means for Solving the Problems The technical means of the present invention for solving the above-mentioned problems are formed in a flat shape, and on the side surface,
A fuel tank provided with a circumferential band hooking portion 75 having a first step portion 76 engaging one side in the width direction of the band 59 and a second step portion 77 engaging the other side in the width direction of the band 59. The first step portion 76 and the second step portion 77 of the band hanging portion 75 are offset from each other in the circumferential direction so as not to face each other in the thickness direction of the fuel tank 10.

Another technical means of the present invention is a fuel inlet 1.
The point 0A is formed in the direction orthogonal to the band hanging portion 75. Another technical means of the present invention is formed into a flat shape and has a second step for engaging a first step portion 76 engaging one side in the width direction of the band 59 and a second step engaging the other side in the width direction of the band 59 on the side surface. In a method of molding a fuel tank 10 provided with a circumferential banding portion 75 having a portion 77, a mold 79 forming the fuel tank 10 is provided with a first split mold 81 facing in the thickness direction of the fuel tank 10. , The second split mold 82 is provided, and the first split mold 81 and the second split mold 82 face the first step portion 76 and the second step portion 77 of the band hooking portion 75 in the thickness direction of the fuel tank 10. The point is that they are formed so as to be offset from each other in the circumferential direction so as not to occur.

Another technical means of the present invention is a first split mold 81.
Alternatively, one of the second split molds 82 forms the first stepped portion 76 of the band hanging portion 75, and the other of the first split die 81 or the second split mold 82 forms the second stepped portion 77 of the band hanging portion 75. It is in the point of formation.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 6 and 7, 1 is a backhoe, and the backhoe 1 is mainly composed of an upper revolving structure 2 and a lower traveling device 3, and even if the revolving base 6 revolves around a vertical axis, The rear surface side of the swivel base 6 is referred to as a small rear small swivel backhoe in which the rear surface side of the swivel base 6 is formed in an arc shape in plan view so that the rear surface side does not extend beyond the lateral width of the traveling device 7.

The traveling device 3 is provided with a pair of left and right traveling bodies 4 of rubber crawler type driven by a hydraulic motor on the traveling frame 3A, and a dozer 5 is provided at the front of the traveling device 3.
Is provided. The revolving structure 2 includes a revolving base 6 which is supported on the traveling device 3 so as to be rotatable left and right around a vertical axis.
Working device (excavation device) 7 provided in front of the swivel base 6
And a driver's seat 8 provided on the swivel base 6, an engine 9,
Fuel tank 10, hydraulic pump 11, hydraulic oil tank 12,
The control valve 13, the radiator 14, the oil cooler 15, the reserve tank 16, the battery 17, and other various devices mounted on the swivel base 6 are configured.

The driver's seat 8 is arranged to the left of the center of the swivel base 6. As shown in FIG. 8, the swivel base 6 is attached and fixed to the swivel frame 19 and the rear part of the swivel frame 19 to balance the weight of the front part of the swivel base 6 with respect to the working device 7 and the like, and the rear part of the swivel base 6. And a counterweight 20 constituting the above. Further, the left and right side surfaces, the front surface and the upper surface of the turning frame 19 such as the front side of the driver's seat are appropriately covered with a cover body 23 or the like. The revolving frame 19 is provided with a revolving base plate 22 supported on the traveling device 3 via a bearing body 21 so as to be revolvable about the vertical axis, and a reinforcing member and various devices are mounted and fixed on the revolving base plate 22. A mounting member for fixing is fixed.

A pair of upper and lower support brackets 26 are provided on the front portion of the swivel board 22 so as to project forward from the swivel base 6,
A swing bracket 27 is supported on the support bracket 26 so as to swing left and right around a vertical axis. A boom 28 rotatably supported by the swing bracket 27 about the horizontal axis, an arm 29 rotatably supported on the tip side of the boom 28 about the horizontal axis, and a tip side of the arm 29. The working device 7 is mainly composed of a bucket 30 squeezed and dumped so that the boom 28, the arm 29, and the bucket 30 are respectively a boom cylinder 31, an arm cylinder 32, and a bucket which are hydraulic cylinders. It is operable by a cylinder 33.

An engine 9 is horizontally arranged behind the turning board 22 and behind the driver's seat 8. On the left side of the engine 9, a hydraulic pump 11 for supplying pressure oil to various hydraulic devices is arranged. A radiator 14, an oil cooler 15, a reserve tank 16 and a battery 17 are arranged on the right side of the fuel tank 10, the fuel tank 10 is arranged on the front side of the engine 9 and on the left side of the turning board 22, and the front side of the engine 9 is turned on. On the right side of the board 22 and in front of the radiator 14 and the like, a hydraulic oil tank 12 for storing pressure oil for operating hydraulic equipment is arranged, and in front of the hydraulic oil tank 12, a control valve for controlling each hydraulic equipment is installed. A control valve 13 which is vertically stacked is arranged.

The engine 9, the radiator 14, the oil cooler 15, the hydraulic oil tank 12, the control valve 13 and the like project upward from the swivel base 6.
The upper part, the upper part, and the left part of the space above the swivel base 6 in the arrangement space of the hydraulic pump 11 are covered by a support frame 34 fixed to the swivel frame 19 and a fixed cover 35 fixed to the swivel frame 19. There is. In addition, the bonnet 3 is located on the rear side of the upper side of the swivel base 6 in the space where the engine 9, the hydraulic pump 11, the radiator 14, etc. are arranged.
6, the bonnet 36 is attached to the fixed cover 35 via a hinge so as to be vertically swingable, and is openable and closable.

The hydraulic oil tank 12 and the control valve 13 are covered with a tank cover 37. The tank cover 37 is extended to the right side of the fixed cover 35, and is also configured to cover the radiator 14, the oil cooler 15, the reserve tank 16, the battery 17, and the like. The lower end of the front side of the tank cover 37 is pivotally attached to the revolving frame 19 by a hinge so as to be rotatable about an axis in the left-right direction. Thus, the arrangement space for the hydraulic oil tank 12, the radiator 14, etc. is configured to be open.

A pair of left and right traveling control levers 38L and 38R are provided in front of the driver's seat 8 for operating the left and right traveling bodies 4 separately. 39L and 39R are arranged. On the right platform 39R, a boom / bucket operating lever 40 for operating the boom 28 and the bucket 30, a dozer operating lever 41 for operating the dozer 5, and an accelerator lever 42 for controlling engine rotation are operated. As a result, the lock lever 24 disables or enables the boom 28 and the bucket 30 to be operated by the boom / bucket operation lever 40.
It has and.

Further, the swivel base 6 is attached to the left control base 39L.
A swivel motor for swiveling the arm and a swivel / arm operating lever 43 for operating the arm 29; and a lock lever 44 for disabling or enabling the swivel / arm operating lever 43 to operate the swivel / arm 29 by operating the swivel / arm operating lever 43. It is equipped. As shown in FIGS. 8 and 9, the revolving frame 19 is arranged and fixed on a revolving board 22 in a vertical direction and in the left-right direction, and includes an engine 9, a hydraulic pump 11, a radiator 15, an oil cooler 15, Placement of battery 17, etc., fuel tank 10, hydraulic oil tank 1
It has a partition wall 45 made of a plate material that partitions (partitions) the two or the like.

Further, the revolving frame 19 includes a revolving substrate 22.
The weight attachment body 46 is provided and fixed to the upper rear end side. The weight mounting body 46 is made of cast steel and serves as one end of the weight, and is provided with weight mounting portions 47 on both left and right sides and a central portion in the left and right direction. Further, a pair of left and right engine mounting portions 48 for mounting and fixing the rear lower end side of the engine 9 to the weight mounting body 46, and the leg portion 3 on the rear side of the support frame 34 that supports the fixed cover 35.
A pair of left and right support frame attachment portions 49 for attaching and fixing the lower end of the 4R are provided.

The radiator fan 50 provided on the right side of the engine 9 is of a suction type that sucks in air from the outside, and an outside air intake port is formed on the rear side of the side surface of the tank cover 37, so that the sucked air is sucked in. Is designed to escape to below the swivel base 6 or the like. Also, the hydraulic oil tank 12
The arrangement portion of and the arrangement portion of the radiator 14 and the like are partitioned by the partition wall 45 and other partition members,
The hydraulic oil tank 12 is configured so as not to suck air. Further, the arrangement portion of the radiator 14 and the like and the arrangement portion of the engine 9 are also partitioned with respect to the periphery of the radiator 14. Further, the arrangement portion of the engine 9 and the arrangement portion of the driver's seat 8 are partitioned by the partition wall 45, the fixed cover 35, and other partition members.

Further, on the center side of the swivel board 22 in the left-right direction, a vertical rib which is vertically arranged and comprises a pair of left and right plate members extending from the front part to the rear part of the swivel board 22 so as to intersect with the partition wall 45. 51L and 51R are fixed.
The front ends of the vertical ribs 51L and 51R are connected to the support bracket 26, and the rear ends of the vertical ribs 51L and 51R are connected to the weight mounting body 46. The partition wall 4
5 is the front side of the left vertical rib 51L in the lateral direction outside of the fuel tank 10, and the front side of the partition wall 45 is the lateral side of the right vertical rib 51R in the lateral direction where the hydraulic oil tank 12 is located. The radiator 14, the oil cooler 15, the reserve tank 16 and the battery 17 are disposed on the rear side of the partition wall 45 and on the outer side in the left-right direction of the right vertical rib 51R, and on the rear side of the partition wall 45 and the radiator 14 The left side of the arrangement parts such as is the arrangement part of the engine 9.

As shown in FIGS. 10 to 14, most of the fuel tank 10 is housed inside the swivel base 6,
A part of the swivel base 6 is formed in a protruding shape, and an oil supply port 10A is provided in the protruding portion.
Is covered with a left side portion of the fixed cover 35, and an opening 35A for refueling is formed on the left side surface of the fixed cover 35 so as to be opened and closed by a lid. In addition, the fuel tank 10 includes a swivel frame 19
Is partially supported by a pair of left and right pedestals 52L and 52R provided on the upper side of the swivel board 22, and the discharge port 5 is provided at the bottom of the fuel tank 10.
6 and the drain port 57 are disposed between the left and right pedestals 52L and 52R, and are configured so that the discharge port 56 and the drain port 57 do not interfere with the swivel board.

A suction pipe is connected to the discharge port 56, and the fuel is sent to the engine 9 through the suction pipe. On the left side of the swivel board 22 where the fuel tank 10 is arranged, a recess 53 is formed which is recessed downward. The recess 53 is formed by notching a thick plate material that mainly constitutes the swivel board 22 and providing a closing plate 54 so as to close the notch portion 22a from the lower surface side. The left pedestal 52L is provided at the bottom of the recess 53, and the right pedestal 52R is provided on the thick plate material that mainly constitutes the swivel substrate 22.

If the heights of the left and right pedestals 52L and 52R are set too high, the capacity of the fuel tank 10 should be reduced or the fuel tank 10 should be moved laterally in order to accommodate most of the fuel tank 10 inside the swivel base 6. Although the discharge port 56 and the drain port 57 are provided at positions corresponding to the recesses 53, the heights of the left and right pedestals 52L and 52R do not need to be so high. Produce an effect. Further, the fuel tank 10 is laterally positioned by being pressed against the partition wall 45 and the left vertical rib 51L, and is fixed by being pressed by the fixing means 58 against the partition wall 45 and the left vertical rib 51L. To be done.

The abutting portions 10B and 10C of the fuel tank 10 to the partition wall 45 and the left vertical rib 51L are formed into flat surfaces so as to make surface contact with the partition wall 45 and the left vertical rib 51L. The vertical movement of the fuel tank 10 is restricted. Fixing means 5
As shown in FIGS. 10, 13, and 14, reference numeral 8 denotes a band 59 that is applied to the lateral outer surface of the fuel tank 10 in the front-rear direction, and a lock provided on the rear end side of the band 59. It is mainly configured by a tool 60 and a fastening tool 61 provided between the front end side of the band 59 and the locking portion 62 provided on the swivel base plate 22.

The locking tool 60 provided on the rear end side of the band 59 is a bolt 6 fixed to the rear end side of the band 59.
4 and a nut 65 screwed to the bolt 64, the bolt 64 penetrates the partition wall 45,
By screwing the nut 65 onto the bolt 64 from the rear surface side of the partition wall 45, the rear end side of the band 59 is locked (fixed) to the partition wall 45. On the other hand, on the swivel board 22, a support plate 66 located on the left front side of the fuel tank 10 is erected upright, and on the right end side of the support plate 66, a locking portion 62 formed by forming a bar material in a U shape is provided. Has been.

The tightening tool 61 includes a bolt 67 penetrating the front end side of the band 59 so as to be movable in the left-right direction, a nut 65 screwed to the bolt 67, and the locking member fixed to the bolt 67. Hook member 6 hooked to the portion 62
9 and the hook member 69 is hooked on the locking portion 62 and the nut 68 is tightened, so that the band 59
As a result, the fuel tank 10 is divided into the partition wall 45 and the left vertical rib 5.
The fuel tank 10 is fixed by being pressed against 1 L. Further, the fuel tank 10 is pressed down by a pair of front and rear stays 70F, 70R which come into contact with the upper and lower surfaces of the front and rear portions of the fuel tank 10 from above.
Upward movement is restricted.

The front stay 70F is fixed to the support plate 66 with bolts and nuts, and the rear stay 70R is fixed to the partition wall 45 with bolts and nuts.
It should be noted that the insertion holes for the bolts that fix the front and rear stays 70F and 70R are elongated holes in the vertical direction.
Vertical position adjustment of 0F and 70R is possible. Figure 1
As shown in FIG. 3, the fuel tank 10 is formed in a flat shape so as to have a small thickness (vertical dimension), and the fuel tank 10 is circumferentially banded at a central portion in the vertical direction on one side surface of the fuel tank 10. A section 75 is provided. This band hanging part 7
Reference numeral 5 is for holding the band 59 in engagement with the fuel tank 10. The first step portion 76 engages one side (upper side) of the band 59 in the width direction and the other side (lower side) of the band 59 in the width direction. Second step portion 77 that engages with the side).

The first stepped portion 76 and the second stepped portion 77 of the band hanging portion 75 are circumferentially offset from each other so as not to face each other in the thickness direction (vertical direction) of the fuel tank 10. As shown in, the side surface of the fuel tank 10 corresponding to the first step portion 76 in the thickness direction (vertical direction) is formed by a smooth surface without a recess from the lower end side to the first step portion 76, Further, it is formed by a smooth surface without a concave portion from the upper end side to the first step portion 76. Further, as shown in FIG. 5, the side surface of the fuel tank 10 corresponding to the second step portion 77 in the thickness direction is formed as a smooth surface without a recess from the upper end side to the second step portion 77, Further, it is formed of a smooth surface having no concave portion from the lower end side to the second step portion 77. Further, the fuel inlet 10A of the fuel tank 10 is formed in an upward direction orthogonal to the band hooking portion 75.

Next, a method of molding the fuel tank 10 will be described. As shown in FIGS. 1 to 5, a mold 79 for forming the fuel tank 10 is opposed to the fuel tank 10 in the thickness direction (vertical direction). A first split mold 81 and a second split mold 82 are provided. With the first split mold 81 and the second split mold 82, the first step portion 76 and the second step portion 77 of the band hooking portion 75 are circumferentially offset from each other so as not to face each other in the thickness direction of the fuel tank 10. Form. In this case, as shown in FIGS. 1 to 5, the mold 79 having the first split mold 81 and the second split mold 82 is located at the positions of the first step portion 76 and the second step portion 77 of the fuel tank 10. Divided in the thickness direction (up and down), the first step portion 76 and the second step portion 7
The boundary part with 7 is the first split mold 8 via the inclined joint surface 84.
1 and the second split mold 82 are divided, the first step portion 76 is formed by the second split mold 81 as shown in FIG. 4, and the second step portion 77 is formed as the first split mold as shown in FIG. It is designed to be formed at 82.

Therefore, after the fuel tank 10 is molded between the first split mold 81 and the second split mold 82 by injection molding or the like, the first step 76 and the second step 77 may be caught. Instead, the first split mold 81 and the second split mold 82 can be opened in the thickness direction (up and down) of the fuel tank 10 to easily take out the molded product of the fuel tank 10 from the mold 79. Moreover, since the first split mold 81 and the second split mold 82 are opposed to each other in the thickness direction, these split molds 81 and 82 can be formed shallowly, and at the time of molding, for example, the fuel tank 10 shown in FIG.
It is possible to minimize the radius of the end a of the.

FIG. 15 shows another embodiment. As in the case of the above-mentioned embodiment, the mold 79 having the first split mold 81 and the second split mold 82 is the first stage of the fuel tank 10. The upper and lower parts are divided at the positions of the portion 76 and the second step portion 77, but the boundary portion between the first step portion 76 and the second step portion 77 is the fuel tank 1
The first split mold 81 and the second split mold 82 are divided via a joint surface 85 of 0 in the thickness direction. In other respects, the configuration is the same as in the case of the above-described embodiment, and similarly to the case of the above-described embodiment, the first step portion 76 is formed by the second split mold 81, and the second step portion 77 is formed as the first split portion. It is designed to be formed by a mold 82.

[0032]

According to the present invention, it is possible to form the fuel tank 10 with a mold having a first split mold 81 and a second split mold 82 that are opposed to each other in the thickness direction of the fuel tank 10. The fuel tank 10 can be manufactured easily and inexpensively with a mold having a structure as simple as possible.

[Brief description of drawings]

FIG. 1 is a front view of a fuel tank showing an embodiment of the present invention.

FIG. 2 is a right side view of the fuel tank.

FIG. 3 is a left side view of the fuel tank.

FIG. 4 is a sectional view taken along line AA of FIG.

5 is a sectional view taken along line BB of FIG.

FIG. 6 is a side view of the backhoe.

FIG. 7 is a plan view of the backhoe.

FIG. 8 is a plan view of the swivel frame.

FIG. 9 is a rear view of the swivel frame and the like.

FIG. 10 is a plan view of a mounting portion of the fuel tank.

FIG. 11 is a side view of a mounting portion of the fuel tank.

FIG. 12 is a front view of a mounting portion of the fuel tank.

FIG. 13 is a plan view of a fixed portion on the rear side of the band.

FIG. 14 is a plan view of a fixed portion on the front side of the band.

FIG. 15 is a front view of a fuel tank showing another embodiment.

FIG. 16 is a plan view of a mounting portion of a fuel tank showing a conventional example.

FIG. 17 is a side view of a mounting portion of the fuel tank.

FIG. 18 is a front view of a mounting portion of the fuel tank.

[Explanation of symbols]

10 Fuel tank 10A fuel inlet 75 Band hanging part 76 First stage 77 Second stage 79 mold 81 First split type 82 Second split type

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI F02M 37/00 301 B29L 22:00 // B29L 22:00 B60K 15/02 A (72) Inventor Teruo Kunizawa Ishizu Sakai, Osaka Prefecture 64 Kitamachi Kubota Sakai Factory (72) Inventor Kenzo Koga 64 Ishizu Kitamachi, Sakai City, Osaka Prefecture Kubota Sakai Factory (72) Inventor Tomoaki Miyake 64 Ishizu Kitamachi, Sakai City, Osaka Ku Bota Sakai Plant (56) Reference JP-A-9-272347 (JP, A) JP-A-46-2732 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) B60K 15 / 03

Claims (4)

(57) [Claims] 1. A flat (5) band (5) is formed on the side surface.
9) a first step (76) engaging one side in the width direction and a second step (77) engaging the other side in the width direction of the band (59).
In a fuel tank provided with a circumferential banding part (75) having a fuel tank (10), the first step (76) and the second step (77) of the banding part (75) are ), Which are offset from each other in the circumferential direction so that they do not face each other in the thickness direction. 2. The fuel tank according to claim 1, wherein the fuel inlet (10A) is formed in a direction orthogonal to the band hooking portion (75). 3. A band (5) is formed on the side surface and is formed in a flat shape.
9) a first step (76) engaging one side in the width direction and a second step (77) engaging the other side in the width direction of the band (59).
In a method of molding a fuel tank (10) provided with a banding portion (75) in the circumferential direction, the mold (79) forming the fuel tank (10) is provided in the thickness direction of the fuel tank (10). Opposing first split mold (81)
And a second split mold (82) are provided, and the first split mold (81) and the second split mold (82) provide a first step portion (76) and a second step portion of the band hanging portion (75). (77) and the fuel tank (10) are formed so as to be offset from each other in the circumferential direction so as not to face each other in the thickness direction of the fuel tank (10). 4. First split mold (81) or second split mold (82)
On the other hand, the first stepped part (76) of the banding part (75) is formed, and the other of the first split mold (81) or the second split mold (82) is used to form the second part of the banding part (75). The method for molding a fuel tank according to claim 3, wherein a step (77) is formed.