JP2006248490A - Work vehicle tank structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To decrease parts count, and to facilitate assembling, in a fuel tank or a hydraulic oil tank of a work vehicle. <P>SOLUTION: In tanks 90, 91 attached to the work vehicle 1 and holding fuel or hydraulic oil, the tanks 90, 91 are formed in a stepped-shape and so as to projecting toward a side at lower parts. A stepped surface 92 provided on the tanks 90, 91 is inclined in one direction, and the tanks 90, 91 are suspended on a bottom surface of a mast portion 64 bulging out to the outside of a chassis 9. A stay 95 for fixing a battery 98 is provided on the tank 91, and an opening portion 95b for hanging the tank 91 when assembled to the stay 95 is provided. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a technique for reducing the number of parts of a work vehicle, and more particularly to a tank shape mounted on the work vehicle and a structure for reducing parts around the tank mounting portion.

Conventionally, a fuel tank or a hydraulic oil tank mounted on a work vehicle is known as a part of a boarding / exiting member. For example, what uses a step attached to the tank with which a work vehicle is mounted | worn is known. This is fixed on the side surface of the fuel tank or hydraulic oil tank disposed in the vertical direction on the side portion of the work vehicle and the step for getting on and off. The step is fixed directly to the side of the tank. (See Patent Document 1).
JP 2000-240006 A

In the conventional technology, a step is simply attached to a side surface of a fuel tank or a hydraulic oil tank. The tank is used as a support member for the step, and the tank itself is not used effectively. And the technique shown by patent document 1 becomes a structure which protrudes a step from a tank side surface, and the load concerning a step concentrates on a tank side surface attaching part. For this reason, it is necessary to sufficiently increase the rigidity of the tank side surface. In addition, since the tank for storing hydraulic oil and fuel is disposed in the vertical (up and down) direction, the center of gravity of the fuel tank itself is increased, and the center of gravity of the work vehicle 1 in which such a fuel tank is disposed is increased. Easy to influence.
In addition, a step of fixing to the fuel tank is required as a part, the number of parts constituting the work vehicle is increased, and work man-hours and labor are required in the assembly process.

The present invention takes the following means in order to solve the above problems.
According to a first aspect of the present invention, in a tank that is mounted on a work vehicle and holds fuel or hydraulic oil, the tank has a stepped shape, and a lower portion of the tank projects sideways.

  As described in claim 2, the step surface provided in the tank is inclined in one direction.

  As described in claim 3, the tank is suspended from the bottom surface of the mast portion that protrudes to the outside of the chassis.

  According to a fourth aspect of the present invention, a battery fixing stay is provided on the tank, and an opening is provided for hanging the tank when the stay is assembled.

Since the tank is configured as described in claim 1, the tank can be used as a step for getting on and off, and the tank capacity can be increased. And the number of parts including the stairway for boarding / alighting can be reduced, and the cost required for assembly and manufacturing can be reduced.
And since the load concerning the step surface of a tank can be received by the tank itself, the local concentration of a load can be prevented and the durability of the tank as a step can be improved.
By projecting to the side, a sufficient tank capacity can be secured even at a small height.

  As described in claim 2, since the tank is configured, it is easy to remove earth and sand, mud, and water on the staircase surface, and the cleanability of the tank can be improved. And the slip of the step at the time of boarding / alighting can be suppressed.

  Since the tank is configured as described in claim 3, the structure in the vicinity of the tank arrangement portion can be simplified, and the number of parts of the tank arrangement portion can be reduced. Further, since the tank can be directly attached to the highly rigid frame, the step rigidity can be ensured.

  Since the tank is configured as described in claim 4, the battery can be arranged directly on the tank surface, the number of parts can be reduced, and the assembling property of the tank can be improved.

  In the present invention, a stairway for getting on and off is constituted by a tank, and the number of parts of the work vehicle is reduced.

[overall structure]
A work vehicle according to an embodiment of the present invention will be described.
FIG. 1 is an overall side view of a work vehicle.
A work vehicle 1 shown in FIG. 1 is a tractor loader backhoe, and is equipped with a loader 2 and an excavator 3. A control unit 4 is provided at the center of the work vehicle 1, a loader 2 is disposed in front of the control unit 4, and an excavator 3 is disposed behind the control unit 4. The work vehicle 1 is equipped with front wheels 8 and 8 and rear wheels 7 and 7 so as to be able to travel with the loader 2 and the excavator 3 attached.
The steering unit 4 is provided with a steering handle 5 and a control seat 6, and a traveling operation device and an operation device for the loader 2 are provided on the side of the seat 6. Thereby, in the control part 4, the steering operation of the work vehicle 1 and the operation of the loader 2 are enabled.
A loader 2 as a loading device is connected to a side portion of the work vehicle 1 and extends forward, and a bucket is attached to the tip. An engine is disposed in the front portion of the frame 9 that is a chassis of the work vehicle 1, and a bonnet 30 disposed on the frame 9 covers the engine. The loader 2 is disposed outside the bonnet 30.
The excavator 3 is detachably attached to the rear portion of the work vehicle 1, and the operation of the excavator 3 is performed by an operating device disposed behind the cockpit 6.
A hydraulic oil tank 90 is disposed on the side of the control unit 4, and the hydraulic oil tank 90 also serves as a step when getting on and off the control unit 4, and is opposite to the control unit 4. Has a staircase composed of a fuel tank.

[Frame structure]
Next, the frame configuration of the work vehicle will be described.
FIG. 2 is a plan view showing a frame of the work vehicle.
FIG. 3 is a side view of the same.
FIG. 4 is also a front view.
The frame 9 of the work vehicle connects side frames 62 and 62 disposed in parallel in the front-rear direction, front frames 63 and 63 connected to the front portion of the side frame 62, and front portions of the front frames 63 and 63. The front plate 61 is configured. A mast portion 64 is formed on the outer surface of the front frame 63, and the front frames 63 and 63 are connected by a rib 65.
A connecting member is disposed between the side frames 62 and 62, and the frame 9 has a ladder structure. A beam 62b extends from the side frame 62 toward the side. The beam 62b has a C-shaped cross section and supports the floor portion of the control unit 4.
The front frame 63 extends upward from a connection portion with the side frame 62, and a mast portion 64 is attached to a portion extending upward. An engine is disposed between the front frames 63 and 63, and a bonnet 30 is disposed. The lifting mechanism of the loader 2 is connected to the mast portion 64, and the loader 2 is supported by the mast portion 64.
The mast lower part 64b which is the lower part of the mast part 64 is comprised by the member protruded to the side. The mast lower portion 64b is configured by a member having a cross-sectional shape that has an L shape, and receives a vertical force applied to the mast portion 64.

[Tank arrangement]
Next, the configuration of the tank disposed in the work vehicle will be described.
FIG. 5 is a perspective view showing an arrangement configuration of the tank.
FIG. 6 is also a front view.
FIG. 7 is a side view of the same.
A hydraulic oil tank 90 and a fuel tank 91 are disposed on the side of the control unit 4 of the work vehicle 1. The hydraulic oil tank 90 and the fuel tank 91 are disposed on the side of the frame 9 and are suspended from the frame 9, and are connected to the lower surfaces of the mast lower part 64b and the beam 62b, respectively. It has become. Both the mast lower part 64 b and the beam 62 b are configured to protrude laterally from the side frame 62 constituting the frame 9.
In this embodiment, as shown in FIG. 6, a hydraulic oil tank 90 is disposed on the right side of the frame 9 of the work vehicle, and a fuel tank 91 is disposed on the left side. The hydraulic oil tank 90 and the fuel tank 91 are configured in a step-like shape (L-shape) when viewed from the front, and have a shape in which the lower part protrudes to the side (outside the machine body) from the upper part. Thereby, even if the height is low, a sufficient tank capacity can be secured, and the fuel tank 91 and the hydraulic oil tank 90 can be configured compactly in the vicinity of the control unit 4.
Then, the stepped surface of the tank can be used as a step when getting on and off the control unit 4. Further, slip stoppers 94 and 94 are mounted at the corners of the hydraulic oil tank 90 and the fuel tank 91, respectively, to ensure stability when getting on and off.

In the fuel tank 91, an injection port 93 is provided so as to protrude obliquely upward and outward, and the injection port 93 is provided between an upper portion 91a and a lower portion 92b of the fuel tank 91. And it is arrange | positioned in the site | part formed in the right angle of the fuel tank 91 outer side part. A battery 98 is disposed on the upper surface of the fuel tank 91. The battery 98 is disposed between the mast lower part 64b and the beam 62b.
As described above, since the hydraulic oil tank 90 and the fuel tank 91 are disposed, the hydraulic oil tank 90 and the fuel tank 91 can be used as steps for getting on and off when getting on and off the control unit 4. Moreover, since the hydraulic oil tank 90 or the fuel tank 91 is stepped on and off when getting on and off, the change in the hydraulic oil or the amount of fuel can be recognized by hearing by the sound at the time of stepping on. And the battery 98 can be arrange | positioned using the clearance gap between the flame | frame 9, and the space of the flame | frame 9 side can be utilized effectively.
The battery 98 disposed on the fuel tank 91 is covered with a cover attached to the work vehicle 1 and is protected from rainwater and earth and sand.

[Fuel tank]
Next, the configuration of the fuel tank 91 of the work vehicle will be described.
FIG. 8 is a view showing the assembly configuration of the fuel tank.
FIG. 9 is a perspective view of the fuel tank.
FIG. 10 is a side view of the fuel tank.
FIG. 11 is a plan view of the fuel tank.
The fuel tank 91 is configured in a stepped shape when viewed from the front, and has a shape in which a lower portion 91b protrudes laterally from an upper portion 91a of the fuel tank 91. The upper surface of the lower portion 91 b is a step surface 92, and a slip stopper 94 is attached to the edge of the step surface 92. By configuring the fuel tank 91 in this way, the center of gravity of the fuel tank 91 can be lowered.
Further, the fuel tank 91 has a shape in which a front outer side is notched in a plan view, and the fuel tank 91 is less likely to be caught by an obstacle or the like when the work vehicle 1 is traveling. Further, the injection port 93 of the fuel tank 91 is located in the vicinity of the notch portion in plan view, and is difficult to remain on the step surface 92 even when fuel leaks during fuel injection.

And since the fuel tank 91 whose bottom surface is smooth is disposed between the front wheel 8 and the rear wheel 7, mud and soil which the front wheel 8 and the rear wheel 7 roll up can be received on the smooth bottom surface of the fuel tank 91, Easily wash off mud and soil adhering during cleaning. The hydraulic oil tank 90 disposed on the opposite side of the fuel tank 91 also exhibits the same effect.
In the upper portion 91a of the fuel tank 91, stays 95 and 95 are fixed to the upper surface. The stay 95 fixes the battery 98 placed on the fuel tank 91, and the outer end (side away from the machine body) of the stay 95 formed on the upper surface of the upper portion 91a extends outward. Thereby, it becomes easy to place the battery 98 on the fuel tank 91, and the labor when assembling the battery 98 is reduced.

The stay 95 is provided with a hole 95b (opening), which is used for fixing the battery 98 and assembling the fuel tank 91.
The battery 98 is placed on the fuel tank 91 between the stays 95 and 95, and a locking tool 99 is attached from above the battery 98. By locking the hook at the tip of the locking tool 99 in the hole 95 b of the stay 95, the battery 98 is fixed to the upper surface of the fuel tank 91 by the locking tool 99.
The hole 95b provided in the stay 95 can be used as a hole for hanging when the fuel tank 91 is assembled to the frame 91 of the work vehicle. Thereby, the labor at the time of the assembly | attachment of the fuel tank 91 can be reduced. Since the fuel tank 91 is mounted in a suspended state between the mast lower part 64b and the beam 62b, the stay 95 is located between the mast lower part 64b and the beam 62b in plan view and is located above the stay 95 when assembled. There is no member, and the fuel tank 91 can be easily suspended by the stay 95. Since the fuel tank 91 is attached to the bottom of the mast lower part 64b and the beam 62b in a suspended state, the attaching operation becomes easy.

[Step surface tilt]
Next, the configuration of the step surface 92 will be described.
FIG. 12 is a schematic diagram showing the inclined configuration of the step surface in the left-right direction. Fig.12 (a) is a schematic diagram which shows the inclination state of a step surface. FIG. 12B is a schematic diagram showing the configuration of the step surface when riding.
FIG. 13 is a schematic diagram showing an inclined configuration of the step surface in the front-rear direction. FIG. 13A is a schematic diagram showing a forward inclined state of the step surface. FIG. 13B is a schematic diagram showing a rear inclined state of the step surface.

The step surface 92 of the fuel tank 91 and the hydraulic oil tank 90 can be improved by getting the step surface 92 inclined so that the outer side is lower than the inner side. At the time of boarding, since the boarding unit is boarded from the side of the work vehicle, the step surface 92 faces the traveling direction of the passenger. Thereby, it becomes easy to generate a drag in the surface direction on the step surface 92. That is, when the step surface 92 is inclined by the angle θ with respect to the force Fs applied to the foot during boarding, the vertical drag Fv is generated. Note that the normal force Fv is obtained by Fs · sin (θ).
Inclining the step surface 92 in this way makes it difficult for the feet to slip, makes it easy to get on and off, and improves the cleanability of the step surface 92. And when getting off, since the step surface 92 faces outward, the ankle bending angle of the foot placed on the step surface 92 increases. Thereby, the burden on the foot when getting off can be reduced. A slip stopper 94 is provided at the edge of the step surface 92 to prevent slipping on the step surface 92 when getting on and off.
Note that the inclination angle θ of the step surface 92 is determined within a range in which sufficient boarding / exiting ability can be maintained.

Further, as shown in FIG. 13, by tilting the step surface 92 in the front-rear direction, earth and sand, mud, water and the like can be easily discharged, and the cleanability of the step surface 92 can be improved. That is, by cleaning the step surface 92 by an angle θ with respect to the horizontal, the cleanability of the step surface 92 can be improved. Note that the inclination angle θ of the step surface 92 is determined within a range in which sufficient boarding / exiting ability can be maintained. When the outside of the tank is washed from the side of the work vehicle 1 by water discharge or the like, the water is discharged to the front or rear side.
Since the inner upper surfaces of the fuel tank 91 and the hydraulic oil tank 90 are inclined, the air in the fuel tank can be smoothly vented. Moreover, since the fuel and hydraulic oil adhering to the inner upper surface can be smoothly returned downward, the deterioration of the hydraulic oil and the vaporization of the fuel can be suppressed. Under the force generated by the steering of the work vehicle, the fuel can easily move along the inclined surface on the inside, the cleanability in the tank is improved, and the rust in the tank can be suppressed.

The whole side view of a work vehicle. The top view which shows the flame | frame of a working vehicle. Similarly side view. Similarly front view. The perspective view which shows the arrangement configuration of a tank. Similarly front view. Similarly side view. The figure which shows the assembly | attachment structure of a fuel tank. The perspective view of a fuel tank. The side view of a fuel tank. The top view of a fuel tank. The schematic diagram which shows the inclination structure of the left-right direction of a step surface. The schematic diagram which shows the inclination structure of the front-back direction of a step surface.

Explanation of symbols

62b Beam 64b Lower mast 90 Hydraulic oil tank 91 Fuel tank 92 Step surface 93 Inlet 94 Non-slip 95 Stay 98 Battery

Claims (4)

  A tank structure for a work vehicle, wherein the tank is attached to the work vehicle and holds fuel or hydraulic oil, and the tank has a stepped shape and a lower portion of the tank projects sideways.   2. The tank structure for a work vehicle according to claim 1, wherein a step surface provided in the tank is inclined in one direction.   The tank structure for a work vehicle according to claim 1, wherein a tank is suspended from a bottom surface of a mast portion that projects to the outside of the chassis. 2. The tank structure for a work vehicle according to claim 1, wherein a stay for fixing the battery is provided on the tank, and an opening for suspending the tank when assembled to the stay is provided.

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