JP2008018913A - Fuel tank structure of working vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel tank structure of a working vehicle capable of easily increasing the storage amount of a fuel by communicating right and left fuel tanks with an auxiliary fuel tank via a connection pipe below a step. <P>SOLUTION: In the working vehicle 1, fuel tanks are arranged below a step 9 of a steering unit 7. The fuel tanks are constituted of right and left fuel tanks 2, 2a arranged on the side of a clutch housing 13, and an auxiliary fuel tank 3 arranged behind the clutch housing 13. The auxiliary fuel tank 3 is communicated with the right and left fuel tanks 2, 2a via a connection pipe 25. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a fuel tank structure for a work vehicle in which a fuel tank is installed below a step such as a tractor or a rice transplanter.

2. Description of the Related Art Conventionally, a tractor in which a pair of left and right fuel tanks are disposed separately behind a clutch housing under a step of a control unit is already known (for example, see Patent Document 1).
Japanese Utility Model Publication No. 2-84784

The tractor disclosed in the above-mentioned patent document has an advantage that the amount of fuel can be increased because the upper chamber walls of the left and right fuel tanks are also used as step plates to integrally form the communication chamber.
However, the fuel tank that is integrated with the step increases in overall size and requires a sufficient reinforcement structure and a strong mounting structure to support the weight of the human body. There are drawbacks such as complexity and high cost.

  In order to solve the above-described problems, the fuel tank structure in the work vehicle according to the present invention is, firstly, in the work vehicle 1 in which the fuel tank is disposed below the step 9 of the control unit 7, the fuel tank is attached to the clutch housing 13. The left and right fuel tanks 2 and 2a are arranged on the side and the auxiliary fuel tank 3 is arranged behind the clutch housing 13, and the auxiliary fuel tank 3 and the left and right fuel tanks 2 and 2a are connected to the connecting pipe 25. It is characterized by being connected to each other.

  Second, the breather hose 27 or the return hose 26 is connected to the auxiliary fuel tank 3.

The fuel tank structure in the work vehicle according to the present invention has the following effects. Since the fuel tank that is allocated to the side of the clutch housing below the step of the control unit and the auxiliary fuel tank that is arranged behind the clutch housing are communicated with each other via a connecting pipe, the auxiliary fuel tank is connected to the left and right fuel tanks. The space between the two can be utilized to increase the amount of fuel accommodated and can be easily installed.
Further, by connecting a breather hose or a return hose to the auxiliary fuel tank, it is possible to easily perform piping using a space formed between the left and right fuel tanks. In addition, by providing a return hose in the auxiliary fuel tank, surplus fuel can be distributed and returned to the left and right fuel tanks while being cooled by a long return path consisting of the auxiliary fuel tank and the connecting pipe. The rise can be suppressed.

An embodiment of the present invention will be described with reference to the drawings. Reference numeral 1 denotes a tractor shown as an example of a work vehicle. The left and right fuel tanks 2 and 2a are installed in the abdominal part of the traveling machine body 4, and the auxiliary fuel tank 3 is placed in the middle of the left and right fuel tanks 2 and 2a. Equipped with a fuel tank structure. The tractor 1 includes a traveling body 4 having a front wheel 1a and a rear wheel 1b mounted with an engine 5 from the front side and covered with a bonnet 6, and a steering unit 7 including a handle, a seat, and the like is disposed behind the traveling body 4 A working machine such as a tillage device can be attached to a three-point link type lifting mechanism (not shown).

  The steering unit 7 is configured to be covered with a cabin 8 and includes sub-steps 10 serving as steps when getting on and off the left and right sides of the step 9 which forms a bottom plate of the cabin 8 and forms a steering unit floor. The sub-step 10 is mounted and fixed to a step side frame (cabin lower frame) 11 formed on the outer periphery of the step 9 at an upper portion thereof, and is provided in an inclined posture in which a lower portion projects sideways.

The step 9 is formed so as to protrude from the left and right so as to form the width of the control unit floor above the center case part 12 of the traveling machine body 4 as in the prior art, and the back side of the center case part 12 of the traveling machine body 4 is formed. It is attached and supported via a vibration isolating member to a support member (cabin support rod) (not shown) protruding on both sides.
Step 9 in the illustrated example forms a bulging portion 9a having a middle height along the upper side of the center case portion 12, and flat floor portions 9b and 9b are extended on both sides thereof.

  As a result, the bulging portion 9 a forms a space in which an auxiliary fuel tank 3 (to be described later) can be installed between the rear surface of the clutch housing 13 connected to the rear surface of the engine 5 and the upper surface of the center case portion 12. In the illustrated example, the clutch housing 13 is integrally formed to bulge on the front side of the center case portion 12. Further, the overall rigidity of the step 9 is enhanced by the protruding structure of the bulging portion 9a, and the step 9 can be provided close to the bulging portion 9a with the center case portion 12 inserted therein. The case 12 can be used also for tractors of different models with different sizes and mounting structures.

  Then, fenders 14 that cover the left and right rear wheels 1b located on both sides of the control unit 7 are integrally provided on the left and right sides of the rear side of the step 9. The fender 14 is attached and supported on both sides of a transmission case portion formed at the rear portion of the center case portion 12.

  Next, the fuel tank structure will be described with reference to FIGS. First, the left and right fuel tanks 2, 2 a are suspended from the step side frame 11 including the step 9 on the left and right sides of the clutch housing 13 or the center case portion 12 connected to the rear portion of the engine 5 with front and rear tank support intervals. The support members 15 and 16 are mounted and supported by the following mounting structure. That is, when the fuel tanks 2 and 2a are manufactured, the mounting structure is formed by attaching the flange portion 17 formed by bending the periphery of the upper tank portion and the lower tank portion, which form a mating die, to the outside and joining them together. It mounts on the attachment seats 19 and 19 protrudingly provided in the inner surface of 16, and is fixed by fixing means, such as a set screw.

  The fuel tanks 2 and 2a form a bulging tank portion 20 that protrudes upward from the rear portion of the tank upper wall so as to increase the capacity of the fuel. The left and right fuel tanks 2, 2 a are connected to each other through a connecting pipe 21, and fuel supplied from a fuel supply pipe 22 with a cap 22 a provided on the fuel tank 2 side is connected via the connecting pipe 21. The fuel tank 2a can be supplied simultaneously.

  The fuel supply pipe 22 protrudes from the upper part of the front wall of the fuel tank 2 toward the front side of the cabin 8, and the cap 22 a is provided at a position higher than the auxiliary fuel tank 3. The connecting pipe 21 is connected to a fuel feed pipe 23 at an appropriate position in the middle. The fuel feed pipe 23 is provided with a fuel supply pump 23 a in the middle, and the other end is connected to the fuel injection pump 24.

  The auxiliary fuel tank 3 connects the auxiliary fuel tank 3 and a base formed in the bulging tank portion 20 of the fuel tanks 2 and 2a through connecting pipes 25 and 25 made of rubber pipes or the like. As a result, the auxiliary fuel tank 3 communicates with the bulging tank portions 20 and 20 located on the left and right sides in the space formed between the bulging portion 9a and the center case portion 12 in step 9, and is stabilized by a simple configuration. It can be attached and supported well.

  Further, with the above configuration, the bulging tank portion 20 of the fuel tanks 2 and 2a is brought close to the back side of the floor portion 9b of the step 9, and the auxiliary fuel tank 3 is brought close to the back surface of the bulging portion 9a to the full allowable space. The tank capacity can be increased as much as possible, and a return hose 26 and a breather hose 27 (to be described later) can be easily installed on the upper portion of the auxiliary fuel tank 3.

  That is, in the attached state, the auxiliary fuel tank 3 connects the base side of the return hose 26 for returning the surplus fuel to the fuel tank and the breather hose 27 for keeping the pressure inside the fuel tank constant at the upper part of the front side wall. Then, the front end side of each hose passes through the space portion formed by the bulging portion 9a, and it is possible to easily perform piping toward the front bonnet 6.

  The return hose 26 is connected to the fuel injection pump 24 and the injection nozzle 29, and supplies the surplus fuel when the fuel is injected and supplied to the cylinder of the engine 5 back to the auxiliary fuel tank 3 side. The breather hose 27 is supported by piping so that the tip end portion is bent downward and opened at a high position in the bonnet 6, whereby the return hose 26 reliably prevents dust from entering from the opening. At the same time, it prevents fuel from leaking from the opening even when the aircraft tilts greatly.

  As described above, the tractor 1 having the fuel tank structure distributes the fuel tanks 2 and 2a behind the clutch housing 13 below the step 9 of the control unit 7, and arranges the auxiliary fuel tank 3 in the space formed therebetween. And communicating with the fuel tanks 2 and 2a through the connecting pipe 25, the auxiliary fuel tank 3 can be installed using the space to easily increase the amount of fuel contained. In addition, individual tanks can be easily manufactured without increasing the size, and can be arranged in a well-balanced manner. The fuel supply to the tractor 1 can be quickly supplied to the other fuel tank 2a and the auxiliary fuel tank 3 through the connecting pipe 21 and the connecting pipe 25 only by supplying from one fuel tank 2.

  Moreover, since the breather hose 27 or the return hose 26 can be connected to the auxiliary fuel tank 3, the piping structure can be installed with a simple configuration between the left and right fuel tanks 2 and 2a. The auxiliary fuel tank 3 can be provided with a return hose 26, so that the high-temperature surplus fuel returned from the engine 5 side is cooled by the long return path from the auxiliary fuel tank 3 through the connection pipe 25 while left and right. The fuel tanks 2 and 2a can be returned to the fuel tanks 2 and 2a in a distributed state, and the rise in the hot water temperature in the fuel tanks 2 and 2a can be suppressed.

It is a perspective view of the tractor provided with the fuel tank structure concerning the present invention. It is a piping diagram which shows the fuel supply path | route with which the tractor of FIG. 1 is provided. It is a front view of the fuel tank structure of FIG. It is a right view which shows the fuel tank structure of FIG.

Explanation of symbols

1 Tractor (work vehicle)
2, 2a Fuel tank 3 Auxiliary fuel tank 4 Traveling machine body 7 Control section 9 Step 13 Clutch housing 25 Connection pipe 26 Return hose 27 Breather hose

Claims (2)

  In the work vehicle (1) in which the fuel tank is disposed below the step (9) of the control unit (7), the left and right fuel tanks (2), (2), which are disposed on the side of the clutch housing (13). 2a) and an auxiliary fuel tank (3) disposed behind the clutch housing (13), and the auxiliary fuel tank (3) and the left and right fuel tanks (2), (2a) are connected to a connecting pipe (25 ) The fuel tank structure of the work vehicle that is communicated with each other via The fuel tank structure for a work vehicle according to claim 1, wherein a breather hose (27) or a return hose (26) is connected to the auxiliary fuel tank (3).

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