阅读说明：本技术 作业车辆 (Working vehicle ) 是由 胁野崇 土居一纪 高桥诚之 伊贺上智弘 野原健司 山下智志 塚本清宏 于 2019-05-30 设计创作，主要内容包括：本发明提供一种作业车辆,其在行驶车体的左右配置有燃料箱,其中,形成为在一个燃料箱上连接有燃料供给管的结构,同时能够得到可维持左右平衡且空气卷入少的燃料箱结构。所述作业车辆具有：第1燃料箱；和第2燃料箱,其具备对所述发动机供给燃料的燃料供给口,第1燃料箱和第2燃料箱通过连通管连接,从连通管的中途部分支的分支管部与第2燃料箱连接,在所述连通管的处于所述中途部与所述第2燃料箱之间的部分设置有止回阀,所述分支管部的与所述第2燃料箱连接的连接部配置在比所述连结管的与所述第2燃料箱连接的连接部靠上方的位置。(The invention provides a working vehicle, wherein fuel tanks are arranged on the left and right of a running vehicle body, wherein a fuel supply pipe is connected to one fuel tank, and a fuel tank structure which can maintain the left and right balance and has less air entrainment can be obtained. The work vehicle includes: 1 st fuel tank; and a 2 nd fuel tank including a fuel supply port for supplying fuel to the engine, the 1 st fuel tank and the 2 nd fuel tank being connected by a communication pipe, a branch pipe portion branching from a middle portion of the communication pipe being connected to the 2 nd fuel tank, a check valve being provided at a portion of the communication pipe between the middle portion and the 2 nd fuel tank, and a connection portion of the branch pipe portion to the 2 nd fuel tank being disposed above a connection portion of the connection pipe to the 2 nd fuel tank.)

1. a work vehicle, wherein,

An engine (E) is mounted on a traveling vehicle body (1),

The work vehicle includes:

A 1 st fuel tank (20L); and

A 2 nd fuel tank (20R) having a fuel supply port (30a) for supplying fuel to the engine (E),

The 1 st fuel tank (20L) and the 2 nd fuel tank (20R) are connected by a communication pipe (31),

a branch pipe portion (31d) branching from the middle portion of the communication pipe (31) is connected to the 2 nd fuel tank (20R),

A check valve (32) is provided in a portion of the communication pipe (31) between the halfway portion and the 2 nd fuel tank (20R), the check valve (32) allowing fuel to flow from the 1 st fuel tank (20L) side to the 2 nd fuel tank (20R) side but preventing fuel from flowing back from the 2 nd fuel tank (20R) side to the 1 st fuel tank (20L) side,

The work vehicle is configured in such a manner that a connection portion (31C) of the branch pipe portion (31d) that is connected to the 2 nd fuel tank (20R) is disposed above a connection portion (31B) of the communication pipe (31) that is connected to the 2 nd fuel tank (20R).

2. The work vehicle according to claim 1,

The 1 st fuel tank (20L) and the 2 nd fuel tank (20R) are formed in a stepped shape to form upper and lower steps (38L, 38R) for elevating the cabin (16).

3. the work vehicle according to claim 1 or 2,

The tank capacity of the 1 st fuel tank (20L) is configured to be smaller than the tank capacity of the 2 nd fuel tank (20R), and the work vehicle is configured such that a urea tank (23) is disposed in front of the 1 st fuel tank (20L).

4. The work vehicle according to any one of claims 1 to 3,

The work vehicle is configured such that a support plate (24) that supports the lower portion of a urea tank (23) is coupled to a 2 nd support plate (22) of the 1 st fuel tank (20L).

Technical Field

The present invention relates to a work vehicle such as an agricultural tractor, and particularly to a fuel tank structure.

Background

As an example of the working vehicle, there is a structure in which: in order to increase the capacity of the fuel tank, fuel tanks are disposed on the left and right sides of the transmission case, a connecting pipe is provided between the left and right fuel tanks to allow fuel to flow therethrough, and the connecting pipe is provided at a position lower than the bottom of the fuel tank and connected to a fuel supply pipe for supplying fuel to the engine (patent document 1).

Further, a structure in which a check valve is provided in a connecting pipe to prevent backflow deviation of fuel is known (patent document 2).

Patent document 1: japanese patent No. 5726540

patent document 2: japanese patent laid-open No. 2007-Asca 297006

However, in the fuel tank structure of patent document 1, the fuel supply port is displaced toward the fuel tank side having a large capacity by improving the position of the fuel supply port on the communication pipe, and the fuel supply port is easily brought to the fuel supply port, but since the fuel supply port is provided in the connection pipe connecting the left and right, when the traveling vehicle body is inclined in the left and right direction, the liquid level of the communication pipe is more easily changed than the liquid level of the fuel tank on the inclined lower side, and air entrainment may occur.

further, in the configuration of patent document 2, since the check valve is provided to prevent the backflow of the fuel, it is effective to provide the fuel supply port not in the communication pipe but in one of the left and right fuel tanks, but in the case where the storage amount of the fuel is large, the left and right balance may be impaired.

Disclosure of Invention

The present invention has been made in view of the above circumstances, and provides a fuel tank structure in which a fuel supply pipe is connected to one fuel tank, and in which a right-left balance is maintained and air entrainment is reduced.

The present invention adopts the following technical means to solve the above problems.

The invention described in claim 1 is a work vehicle in which an engine E is mounted on a traveling vehicle body 1, the work vehicle including: 1 st fuel tank 20L; and a 2 nd fuel tank 20R having a fuel supply port 30a for supplying fuel to the engine E, wherein the 1 st fuel tank 20L and the 2 nd fuel tank 20R are connected by a communication pipe 31, a branch pipe portion 31d branching from a middle portion of the communication pipe 31 is connected to the 2 nd fuel tank 20R, a check valve 32 is provided in a portion of the communication pipe 31 between the halfway portion and the 2 nd fuel tank 20R, the check valve 32 allows the fuel to flow from the 1 st fuel tank 20L side to the 2 nd fuel tank 20R side, but prevents the backflow of the fuel from the 2 nd fuel tank 20R side to the 1 st fuel tank 20L side, in the work vehicle, the connection portion 31C of the branch pipe portion 31d connected to the 2 nd fuel tank 20R is disposed above the connection portion 31B of the communication pipe 31 connected to the 2 nd fuel tank 20R.

the invention described in claim 2 is the work vehicle described in claim 1, wherein the 1 st fuel tank 20L and the 2 nd fuel tank 20R are formed in a stepped shape to constitute upper and lower steps 38L, 38R for loading and unloading the cabin 16.

The invention described in claim 3 is the work vehicle described in claim 1 or 2, wherein a tank capacity of the 1 st fuel tank 20L is configured to be smaller than a capacity of the 2 nd fuel tank 20R, and the work vehicle is configured such that a urea tank 23 is disposed in front of the 1 st fuel tank 20L.

The invention described in claim 4 is the work vehicle described in any one of claims 1 to 3, wherein the work vehicle is configured such that a support plate 24 that supports a lower portion of a urea tank 23 is coupled to the 2 nd support plate 22 of the 1 st fuel tank 20L.

According to the invention described in claim 1, by providing the check valve 32, fuel can be left on the 2 nd fuel tank 20R side having the fuel supply pipe 30 for supplying fuel to the engine E, and when the amount of fuel in the 2 nd fuel tank 20R is large, fuel is transferred to the 1 st fuel tank 20L side through the branch pipe portion 31d, so that fuel is not excessively stored on the 2 nd fuel tank 20R side, and the left-right balance can be maintained, and besides, air entrainment can be suppressed.

according to the invention described in claim 2, in addition to the effect described in claim 1, the 1 st fuel tank 20L and the 2 nd fuel tank 20R can be defined as the upper and lower steps 38L and 38R.

According to the invention described in claim 3, in addition to the effect described in claim 1 or claim 2, the left-right balance of the vehicle body can be maintained.

According to the invention described in claim 4, in addition to the effect described in any one of claims 1 to 3, the load of the urea tank and the 1 st fuel tank 20L can be shared and received.

Drawings

Fig. 1 is a side view of a tractor.

Fig. 2 is a perspective view of a main portion when viewed from above.

Fig. 3 is a perspective view of a main portion when viewed from below.

Fig. 4 is a front view of the main part.

Fig. 5 is an enlarged front view of a main portion.

Fig. 6 is a perspective view of the step portion.

Description of the reference symbols

1: a running vehicle body; 3: a transmission case; 20L: 1 st fuel tank; 20R: a 2 nd fuel tank; 20 a: an oil supply port; 30 a: a fuel supply port; 31: a communicating pipe; 31 d: a branch pipe portion; 31A: a connecting portion; 31B: a connecting portion; 31C: a connecting portion; 32: a check valve; e: an engine.

Detailed Description

Embodiments according to the present invention will be described in detail below with reference to the accompanying drawings.

Fig. 1 is a diagram showing a tractor, in which a diesel engine E is mounted in an engine cover 2 at the front of a running vehicle body 1, the rotational power of the engine E is transmitted to a transmission in a transmission case 3, and the rotational power decelerated by the transmission is transmitted to front wheels 4 and rear wheels 5. A steering wheel 6 for steering the front wheels 4, 4 is mounted behind the engine E, and a driver's seat 7 is provided behind the steering wheel 6. A cylinder case 8 is provided at a rear upper portion of the transmission case 3, and lift arms 9 constituting a part of the hydraulic lift mechanism are rotatably attached to both left and right sides of the cylinder case 8. The lift arm 9 is vertically moved by the telescopic operation of the lift cylinder 10. A three-point link mechanism including an upper link 11 and left and right lower links 12 is provided at the rear portion of the vehicle body, the rotary working machine R is attached to the link mechanism, and the lower link 12 is coupled to the lift arm 9 via a lift lever 13, so that the working machine R can be raised and lowered.

The steering wheel 6, the driver's seat 7, and the like are covered with a cabin 16. The cabin 16 is fixed to the machine body via an elastic member such as vibration-proof rubber, so that vibration of the machine body is difficult to transmit to the cabin.

The cab 16 is formed as an integrated frame structure by a floor 17, front pillars 16a erected on the left and right front portions of the floor 17, rear pillars 16b erected on the intermediate portions of the left and right fenders 18, and an upper frame 16c connecting the upper ends of these pillars to each other, and the frame structure is covered with a roof portion 16 d.

Fuel tanks 20 molded from a resin material are disposed on both left and right sides of the transmission case 3. That is, as shown in fig. 2 to 6, the fuel tank 20 is made of a resin material and is manufactured by blow molding, and the fuel tank 20 is disposed on the right and left sides of the transmission case 3. The tank capacity of the 1 st fuel tank 20L on the left and right sides is made smaller than the tank capacity of the 2 nd fuel tank 20R on the left and right sides. The 1 st fuel tank 20L is formed to be close to the body portion 20La of the transmission case 3 and the extension portion 20Lb located outside, a bottom portion of the body portion 20La is supported by a 1 st support plate 21 coupled to the transmission case 3, and the extension portion 20Lb is supported by a 2 nd support plate 22 fixedly coupled to the 1 st support plate 21.

A urea tank 23 of a urea SCR system is disposed immediately before the 1 st fuel tank 20L. The support plate 24 for supporting the lower part of the urea tank 23 is supported by the transmission case 3, and the support plate 24 of the urea tank is coupled to the 2 nd support plate 22 of the 1 st fuel tank 20L to share and receive the load of the fuel tank 20L.

The support structure of the 1 st fuel tank 20L supports the extension portion 20Lb by the band-shaped plate 25L. The cabin support bracket 39L and the auxiliary bracket 40L are provided in a state of protruding to the left and right from the transmission case 3, and the belt-like plate 25L is suspended and supported at the distal end sides of these brackets.

Further, since the 1 st fuel tank 20L is molded by resin blow molding into the main body portion 20La and the extension portion 20Lb, the extension portion 20Lb is formed with the fuel fill port 20a as a fuel filler, and the fuel fill cap 27 is detachably attached thereto.

Next, the other 2 nd fuel tank 20R is molded into the main body portion 20Ra and the extension portion 20Rb, but the support plate 28 for supporting the 2 nd fuel tank 20R at the tank bottom portion is formed as a plate frame in which front and rear gate-shaped steel members are connected, and the 2 nd fuel tank 20R is supported by fixing the support plate 28 to the side wall or the bottom wall on the transmission case body 3 side via the brackets 29a and 29 b. A fuel supply port 30a is formed at a front lower position on the 2 nd fuel tank 20R side, one end of a fuel supply pipe 30 is connected to the fuel supply port 30a, and the other end of the fuel supply pipe 30 for supplying fuel to the engine E via a fuel pump not shown is connected to the engine E.

In the arrangement relationship between the 1 st fuel tank 20L and the 2 nd fuel tank 20R, the relationship between the tip end portions of the tanks is: the 2 nd fuel tank 20R side having a large capacity is located forward, the 1 st fuel tank 20L side having a small capacity is located rearward, and is also located rearward in the arrangement relationship with the urea tank 23. On the other hand, the relationship of the rear end portions of the tanks is: the rear end of the 1 st fuel tank 20L is located forward of the rear end of the 2 nd fuel tank 20R.

The 1 st fuel tank 20L and the 2 nd fuel tank 20R are attached to the transmission case 3 so that the heights of the bottom surfaces thereof are different from each other, and the bottom surface of the 1 st fuel tank 20L is set higher than the bottom surface of the 2 nd fuel tank 20R.

As described above, since the fuel fill inlet 20a is provided on the 1 st fuel tank 20L side, the 1 st fuel tank 20L and the 2 nd fuel tank 20R are connected together by the resinous communication pipe 31. That is, the communication pipe 31 having one end connected to the inside of the front lower portion of the 1 st fuel tank 20L is formed in a straight line shape having substantially the same diameter, and has the 1 st bent portion 31a, the 2 nd bent portion 31b, and the crank-shaped 3 rd bent portion 31c formed to have gentle inclinations in the middle. The other end of the communication pipe 31 is provided so as to be connected to the inside of the lower front portion of the 2 nd fuel tank 20R.

A branch pipe portion 31d is provided, and the branch pipe portion 31d is branched from a portion near the 1 st fuel tank 20L in the vicinity of the 3 rd bent portion 31c and connected to the front side intermediate height of the 2 nd fuel tank 20R. As described above, since the heights of the bottom surfaces of the 1 st and 2 nd fuel tanks 20L and 20R are set to be different from each other and the connection portion of the communication pipe 31 is made to follow the bottom surfaces, as shown in fig. 5, the connection portion 31A of the 1 st fuel tank 20L and the communication pipe 31 is set to be higher than the connection portion 31B of the 2 nd fuel tank 20R and the communication pipe 31 by the height H1, and the connection portion 31C of the 2 nd fuel tank 20R and the branch pipe portion 31d is set to be higher than the connection portion 31B of the 2 nd fuel tank 20R and the communication pipe 31 by the height H2. The height H2 is set to be larger than the height H1.

The fuel supply port 30a of the 2 nd fuel tank 20R connected to the fuel supply pipe 30 for supplying fuel to the engine E is connected to the lowest position of the 2 nd fuel tank 20R.

Next, a check valve 32 is provided between the 3 rd bent portion 31c of the communication pipe 31 and the 2 nd fuel tank 20R, in other words, on the side closer to the 2 nd fuel tank 20R than the midway portion between the communication pipe 31 and the branch pipe portion 31 d. The check valve 32 is configured to allow fuel to flow from the 1 st fuel tank 20L to the 2 nd fuel tank 20R side, but to prevent fuel from flowing reversely from the 2 nd fuel tank 20R to the 1 st fuel tank 20L, using a film-shaped valve body shown in fig. 8 of patent document 2, for example.

When the filler cap 27 of the fuel tank 20 configured as described above is removed and fuel (light oil) is filled from the filler hole 20a, the fuel first enters the 1 st fuel tank 20L and also enters the 2 nd fuel tank 20R via the communication pipe 31 and the check valve 32 in the communication pipe 31. When the amount of fuel is gradually increased, the fuel flows into the 2 nd fuel tank 20R from the connection portion 31B of the communication pipe 31 and the connection portion 31C of the branch pipe portion 31d, and the amount of fuel in the 2 nd fuel tank 20R is also increased.

Further, fuel is consumed by the operation of the engine E, but when the traveling vehicle body 1 tilts left and right during traveling, fuel can be balanced left and right while reciprocating between the 1 st fuel tank 20L and the 2 nd fuel tank 20R via the communication pipe 31. Specifically, when the traveling vehicle body 1 is tilted to raise the 2 nd fuel tank 20R side in a state where the amount of fuel exceeds the joint portion 31C of the branch pipe portion 31d of the 2 nd fuel tank 20R, the fuel can flow so as to return to the 1 st fuel tank 20L side via the branch pipe portion 31d, but the backflow of the fuel from the joint portion 31B of the 2 nd fuel tank 20R to the 1 st fuel tank 20L is prevented due to the presence of the check valve 32. In addition, when the amount of fuel in the horizontal posture is equal to or less than the connection portion 31C of the branch pipe portion 31d of the 2 nd fuel tank 20R, even if the 2 nd fuel tank 20R side becomes high, the fuel cannot flow back to the 1 st fuel tank 20L side because the fuel cannot exceed the connection portion 31C.

When the 1 st fuel tank 20L side becomes high, even a small amount of fuel can flow out from the connection portion 31B through the check valve 32 of the communication pipe 31 and flow into the fuel tank 20L. Since the joint 31B of the 2 nd fuel tank 20R is lower than the joint 31A of the 1 st fuel tank 20L by the height H1, a small amount of excess fuel can move toward the 2 nd fuel tank 20R.

The fuel supplied to the engine E is supplied to the engine E from the fuel supply pipe 30 connected to the 2 nd fuel tank 20R, but the fuel supply pipe 30 is configured to be supplied with the fuel from the fuel supply port 30a formed at the bottom of the 2 nd fuel tank 20R as much as possible, so that the remaining amount of the fuel can be reduced.

The 1 st fuel tank 20L and the 2 nd fuel tank 20R are connected at their upper portions by a vent connection pipe 33, and a small-diameter vent pipe 34 that opens the upper end portion to the atmosphere is provided in one fuel tank (in the drawing, the 2 nd fuel tank 20R having a large capacity) or both fuel tanks.

A fuel sensor 35 is disposed on the 2 nd fuel tank 20R side to which the fuel supply pipe 30 is connected. The fuel sensor 35 may be any known form, and for example, a stroke sensor may be used, but it may be set by selecting a portion where the liquid level fluctuation is relatively small even when the traveling vehicle body 1 is inclined.

The extension portions 20Lb and 20Rb of the 1 st fuel tank 20L and the 2 nd fuel tank 20R are formed in a stepped shape, and constitute support portions of the upper and lower steps 38L and 38R. That is, as described above, the cab support brackets 39L, 39R and the auxiliary brackets 40L, 40R are provided in a state of being extended to the left and right from the transmission case 3, and the upper and lower steps 38L, 38R made of iron plates and having a two-stage structure are supported on the distal end sides of these brackets. Since the steps 38L and 38R on the lower stage are arranged, step support portions are formed in the extension portions 20Lb and 20Rb of the 1 st fuel tank 20L and the 2 nd fuel tank 20R. Further, the cabin support brackets 39L, 39R and the auxiliary brackets 40L, 40R also serve as support structures for the fuel tanks 20L, 20R.

In the figure, reference numeral 41 denotes a fuel filter that is present in the middle of the fuel supply pipe 30, reference numeral 42 denotes an SCR system, and reference numeral 43 denotes a tool box.