JP6647153B2 - Work vehicle - Google Patents

Description

  The present invention relates to a work vehicle provided with a main fuel tank and a sub fuel tank.

  Conventionally, there has been a configuration in which a main fuel tank is supported by a fixed portion on the fuselage side, and a sub fuel tank is provided on a lower surface side of a hood top plate via a substantially box-shaped storage member. (For example, see Patent Document 1).

JP-A-59-180920

  In the above-described conventional configuration, the auxiliary fuel tank is provided by effectively utilizing the upper space that easily becomes an empty area inside the hood. However, the bonnet is supported so as to be able to swing and open manually for maintenance of the engine and the like, and is made of a thin sheet metal material or the like for weight reduction, and the supporting strength is not sufficient.

  In such a configuration in which the auxiliary fuel tank is supported on a bonnet with insufficient supporting strength, the durability of the auxiliary fuel tank may be damaged due to the vibration of the aircraft body due to continued use. As a configuration for solving such disadvantages, a configuration in which the auxiliary fuel tank is directly supported by the body frame has been considered. For example, a configuration is used in which the auxiliary fuel tank is integrally and firmly attached to the body frame using a box-shaped support portion surrounding the entire auxiliary fuel tank so as to be able to hold the position in the horizontal direction and the vertical direction. However, such a configuration has a disadvantage in that the support structure is complicated, cost is increased, and installation work is troublesome.

  Therefore, it has been desired to be able to favorably support the auxiliary fuel tank for a long period of time even if vibration occurs in the body while simplifying the support structure of the auxiliary fuel tank.

The feature configuration of the work vehicle according to the present invention is a main fuel tank supported in a state of being integrally held with the body,
An auxiliary fuel tank that is provided auxiliary to the main fuel tank and that is supported via a support mechanism with respect to the fuselage;
The support mechanism,
A frame member fixedly extended from the body frame,
A receiving plate member for mounting and supporting the sub fuel tank, and for fixing the sub fuel tank with screws,
A band member for holding the auxiliary fuel tank from above, and a lifting prevention member having both side ends connected to the frame member;
And a vibration absorbing member provided on said frame member for absorbing the vibration of the fuselage, before Symbol vibration absorbing member, extending in a direction crossing the longitudinal direction of the frame member from the frame member, and the frame It is a support arm extending cantilevered from the member and supporting the sub fuel tank .

According to the present invention, the auxiliary fuel tank is mounted and supported on the receiving plate member and fixed by screws.
Further, the auxiliary fuel tank is pressed and held from above by a band member having both side ends connected to the frame member. The receiving plate member is mounted on the frame member.
The receiving plate member has a simple configuration that only mounts and supports the auxiliary fuel tank. The auxiliary fuel tank can be supported on the body by such a simple supporting mechanism of the receiving plate member and the band member.

Since the frame member is provided with the vibration absorbing member for absorbing the vibration, for example, the vibration generated by the mounted engine or the like is absorbed by the vibration absorbing member and is hardly transmitted to the receiving plate member. As a result, it is possible to avoid disadvantages such as that the portion where the sub fuel tank is screwed and fixed to the receiving plate member comes off due to vibration. As the vibration absorbing member, extends toward the receiving plate member from the frame member, there is a relative low rigidity connecting member such as to permit a micro displacement.

Therefore, it is possible to favorably support the auxiliary fuel tank for a long period of time even when vibration occurs in the airframe, while simplifying the support structure of the auxiliary fuel tank.
In the present invention, the support arm has a first support arm and a second support arm, and the first support arm is provided on one end of the frame member in a width direction in a cantilever manner, A second support arm is provided at the other end in the width direction of the frame member in a cantilever manner, and the first support arm and the second support arm are located at different positions in the longitudinal direction of the frame member. Preferably, it is provided.

In the present invention, the main fuel tank and the sub-fuel tank are provided in a state where they are located side by side in the machine body width direction,
A main fuel supply path for supplying fuel to an engine from a supply port provided at a lower part of the main fuel tank, and a supply part connected to a middle part of the main fuel supply path and provided at a lower part of the sub fuel tank. An auxiliary fuel supply passage for supplying fuel to the engine from a mouth, and a reverse fuel supply passage provided in the auxiliary fuel supply passage for allowing fuel to flow from the auxiliary fuel tank to the engine and preventing flow in the reverse direction. With a stop valve,
A connection point between the main fuel supply path and the sub fuel supply path, a path portion from the supply port of the main fuel supply path to the connection point, and from the supply port to the connection point of the sub fuel supply path. It is preferable that each of the path portions is set at substantially the same height as the lower end portions of the main fuel tank and the sub fuel tank.

According to this configuration, fuel is supplied to the engine through the path from the lower supply port of the main fuel tank to the connection point in the main fuel supply path. On the other hand, fuel is supplied to the engine through a path from the lower supply port of the sub fuel tank to a connection point in the sub fuel supply path.
Since the connection points and the respective path portions are set at substantially the same height as the lower end portions of the main fuel tank and the sub fuel tank, even if the remaining fuel levels of the main fuel tank and the sub fuel tank become small, the path portions are not changed. Since fuel remains in the fuel cell, there is no disadvantage such as air flowing in and fuel supply is interrupted, and fuel supply can be performed smoothly. Further, when replenishing fuel, a check valve is provided in the sub fuel supply passage, so that even if fuel is supplied to the main fuel tank, it does not flow into the sub fuel tank. Therefore, after the fuel is supplied to the main fuel tank until the fuel becomes full, the fuel can also be supplied to the sub fuel tank until the fuel becomes full.

In the present invention, the fuselage includes an engine, a clutch housing connected to a rear portion of the engine, and a transmission case connected to a rear portion of the clutch housing,
Each of a path portion from the supply port of the main fuel supply path to the connection point and a path portion of the sub fuel supply path from the supply port to the connection point are located below the clutch housing. It is preferable to be provided in a state.

  According to this configuration, the path portion for supplying fuel to the engine in each of the main fuel tank and the sub fuel tank is provided at a low place of the vehicle body using the lower area of the clutch housing. The main fuel tank and the auxiliary fuel tank can be allocated to the left and right sides of the vehicle body in a well-balanced state by utilizing the empty areas on the left and right sides of the clutch housing.

In the present invention, an engine and an exhaust pipe that guides exhaust gas from the engine outward through a lower portion of a side wall of the hood are provided inside a hood provided at a front portion of the fuselage.
At the lower end of the side wall of the bonnet, a notch is formed to be recessed to secure a gap between the exhaust pipe.
A heat shield cover is provided to cover an outer side of a portion of the exhaust pipe that is exposed more outward than a side wall of the hood,
It is preferable that the heat-shielding cover is provided with a vertically extending portion that covers a laterally outer side of the cutout portion of the hood.

  According to this configuration, the exhaust pipe extends from the inside of the hood to the outside through the lower portion of the side wall of the hood. A notch is formed at the lower end of the side wall of the bonnet, and a gap is secured between the lower end of the bonnet and the exhaust pipe, so that the bonnet is not easily affected by the heat of the exhaust pipe.

  Since the portion of the exhaust pipe exposed to the outside of the hood is covered with the heat shield cover, it is possible to prevent the heat of the exhaust pipe from being blocked by the heat shield cover and released to the outside. The hood is provided to be largely openable for maintenance around the engine. When the bonnet is opened and closed, if a cutout is formed at the lower end of the side wall of the bonnet, it is conceivable to attempt to open and close the hood by hooking a hand on the cutout. In this configuration, since the heat shield cover is provided with the vertically extending portion that covers the lateral side outside of the notch, the hand cannot be inserted below the notch to open and close the hood. As a result, it is possible to prevent the notch part, which has become hot due to the influence of the exhaust pipe, from being accidentally touched by hand.

In the present invention, a cabin that covers an upper part of the operating unit of the aircraft is provided,
The ceiling portion of the cabin includes a first plate member located on the upper outer side, and a second plate member located on the lower inner side, and the first plate member and the second plate member. In a state where an internal space is formed between the outer peripheral portions of the first plate member and the second plate member,
An outer peripheral portion of each of the first plate member and the second plate member is connected to the plate surfaces of the first plate member and the second plate member over a predetermined width,
The first plate member is provided in a state where a connection plate surface portion connected to an outer peripheral portion of the second plate member and an outer end side covering portion covering an outer end surface of the second plate member are continuously connected in series. Is preferable.

  According to this configuration, the ceiling portion of the cabin is formed of the upper and lower two plate members in a state of forming an internal space in the upper and lower middle portions, so that the strength is large while the weight is high and the heat insulating effect is high. . In addition, the outer peripheral portions of the first plate member and the second plate member in the ceiling are connected to each other by a predetermined width, and the first plate member and the second plate member are connected to each other. The connecting plate surface portion connected to the outer peripheral portion of the second plate member and the outer end side covering portion covering the outer end surface of the second plate member are provided in a state of being continuously connected.

  That is, the first plate member and the second plate member are connected to each other over a predetermined width, so that the connection strength is increased, and the first plate member is a connecting plate connected to the outer peripheral portion of the second plate member. Since the outer end side covering portion that covers the outer end surface of the second plate member in a state of being continuously connected from the surface portion is provided, a portion facing the outside of the mating surface portion of the first plate member and the second plate member faces downward. Therefore, there is little possibility that rainwater or the like enters from the mating surface.

  Therefore, the possibility of damage due to intrusion of moisture is small, the connection strength between the first plate member and the second plate member is increased, and the durability of the cabin is improved.

It is the whole tractor side view. It is a perspective view of a cabin ceiling part. It is sectional drawing of the junction part of a cabin ceiling part. FIG. 4 is an exploded perspective view showing a state where a heat shield cover is attached. It is a perspective view which shows the attachment state of the heat shielding cover. It is a perspective view of an auxiliary fuel tank installation part. FIG. 4 is an exploded perspective view of a sub fuel tank disposition portion. It is a figure showing the connection state of a fuel tank. It is an exploded perspective view showing a support structure of a communicating pipe. It is a perspective view which shows the support structure of a communication pipe.

  Hereinafter, a case where an embodiment of a work vehicle according to the present invention is applied to a tractor as an example of a work vehicle will be described with reference to the drawings.

〔overall structure〕
As shown in FIG. 1, the tractor includes a traveling body 3 having a pair of left and right steerable and steerable front wheels 1 and a pair of left and right drivable rear wheels 2, and is configured as a four-wheel drive system. . A bonnet 4 is provided at a front portion of the traveling machine body 3, and an engine 5 and various intake and exhaust devices accompanying the engine 5 are provided inside the hood 4. A driving unit 6 is provided at a rear portion of the traveling body 3, and the driving unit 6 is covered with a cabin 7 on an outer side.

  A front frame 8 extends forward from a lower portion of the engine 5, and an axle case (not shown) for mounting the front wheel 1 and the like are supported on the front frame 8. A clutch housing 9 is integrally connected to a rear portion of the engine 5, and a transmission case 10 is connected to a rear portion of the clutch housing 9. The engine 5, the clutch housing 9, and the transmission case 10 are integrally connected to form a body frame F that supports the entire body.

  At the rear of the transmission case 10, there are provided a link mechanism 11 for connecting a working device (not shown) such as a rotary tilling device or a plow so as to be able to move up and down, and a hydraulic lift cylinder 12 for driving the link mechanism 11 to swing vertically. And a power take-out shaft 13 for transmitting power to the working device.

  The power of the engine 5 is transmitted to the front wheels 1 and the rear wheels 2 via a transmission mechanism (not shown) provided in the clutch housing 9 and the transmission case 10 and transmitted to the power take-out shaft 13 via the transmission mechanism. Is configured.

  The driver 6 is provided with a driver seat 15 on which a driver sits between a pair of left and right rear fenders 14. On the front side of the driver seat 15, a flat boarding step 16 for the driver to ride, front wheel steering A driving operation unit 18 having a steering wheel 17 and other various operation tools is provided.

〔cabin〕
The cabin 7 is entirely supported by a frame-shaped cabin frame 19, the front surface, the left and right side surfaces, and the rear surface are each covered with a glass plate, and the ceiling portion 20 is covered with a plate-shaped member. The entire cabin 7 forms a substantially box-shaped living space that covers the upper part of the driving unit 6.

  As shown in FIG. 2, the ceiling portion 20 of the cabin 7 includes a first plate member 21 located on an upper outer side, and a second plate member 22 located on a lower inner side. In a state where an internal space is formed between the member 21 and the second plate member 22, the outer peripheral portions of the first plate member 21 and the second plate member 22 are connected to each other. With such a configuration, it is possible to have sufficient supporting strength while being lightweight. Further, the internal space formed between the first plate member 21 and the second plate member 22 can be effectively used, for example, by functioning as an air flow path for air conditioning.

  The outer surface of each of the first plate member 21 and the second plate member 22 is connected to the plate surfaces of the first plate member 21 and the second plate member 22 over a predetermined width. Instead of connecting the end surfaces of the two plate members to each other, as shown in FIG. 3, a connection plate surface portion 22a at the outer periphery of the second plate member 22 and a connection plate at the outer periphery of the first plate member 21 are connected. The plate surface portion 21a is bonded and connected with an adhesive. Moreover, the first plate member 21 is provided in a state where the connecting plate surface portion 21a and the outer end side covering portion 21b that covers the outer end surface 22b of the second plate member 22 are continuously connected in series. That is, the first plate member 21 located on the upper outer side has a substantially L-shaped cross section at the outer peripheral portion, and is provided so as to cover the outer end surface 22 b of the second plate member 22. The first plate member 21 and the second plate member 22 are connected such that a portion facing the outside of the mating surface 23 of the first plate member 21 and the second plate member 22 faces downward. As a result, it is easy to prevent rainwater from entering from the mating surface 23.

(Exhaust structure)
An exhaust pipe 24 for guiding the exhaust gas (combustion exhaust gas) of the engine 5 to the outside through the lower portion of the side wall 4A of the bonnet 4 is provided inside the bonnet 4. As shown in FIG. 4, a cutout 25 is formed at the lower end of the side wall 4 </ b> A of the bonnet 4 so as to be recessed in order to secure a gap with the exhaust pipe 24. The exhaust pipe 24 extends from the inside of the hood 4 to the outside of the hood 4 under the notch 25. The exhaust pipe 24 extending outside the bonnet 4 is bent in a substantially arc shape so as to be vertically oriented, and further extends upward to a position higher than the upper part of the bonnet 4.

  Around the exhaust pipe 24, there is provided a cylindrical cover 26 that covers the outer peripheral portion of the exhaust pipe 24 from a portion extending outwardly below the notch 25 of the bonnet 4 to an upper and lower position of the upwardly extending portion 24 </ b> A. Have been. The cylindrical cover 26 has a larger diameter than the exhaust pipe 24, and has a large number of ventilation holes 27 formed on the outer periphery. As shown in FIG. 1, the upper portion of the exhaust pipe 24 projects upward from the upper end of the cylindrical cover 26, and an exhaust port 28 is formed at the upper end. The cylindrical cover 26 is appropriately supported on the exhaust pipe 24 by a bracket (not shown). The provision of the cylindrical cover 26 reduces the possibility that the high-temperature exhaust pipe 24 is exposed to the outside and the worker comes into contact with the exhaust pipe 24.

  Further, a heat shield cover 29 is provided to cover an outer side of a portion of the exhaust pipe 24 exposed to the outside of the side wall 4A of the hood 4. In addition, as shown in FIGS. 4 and 5, the heat shield cover 29 is directed to the outside of the side wall 4A through the exhaust pipe 24 below the notch 25 formed in the side wall 4A of the hood 4. It is provided so as to cover, from the outside, a partially exposed portion 24a that is a portion that extends and is not covered by the cylindrical cover 26.

  The heat shield cover 29 includes a cover body 30 that partially covers the exposed portion 24a from the outside, a cutout cover body 31 that is attached to an upper portion of the cover body 30 and covers the cutout 25 of the hood 4 on the lateral side. It has.

  As shown in FIG. 4, the cover main body 30 is formed by bending a plate body, and has a vertical surface portion 30 a in a vertical position that covers the laterally outward side of the partially exposed portion 24 a in the exhaust pipe 24. The upper surface portion 30b is provided in a state of being connected to the upper end portion of the vertical surface portion 30a and covers the upper side of the partially exposed portion 24a, and the upper surface portion 30b is provided in a state of being connected to the lower end portion of the vertical surface portion 30a and is partially exposed. There is provided a lower surface portion 30c in a horizontal posture that covers the lower side of the portion 24a, and a body connection portion 30d provided in a vertical posture so as to be continuous with the inner end of the lower surface in the machine direction.

  The cover body 30 is integrally fixed to and supported by a support member 32 fixedly extended from the clutch housing 9 as the body frame F by bolt connection. A vertical support portion 32 </ b> A extending in the up-down direction is provided at the extension side end of the support member 32. The body connecting portion 30d of the cover body 30 is connected to and fixed to the lower end portion of the vertical support portion 32A by two bolts. Further, a partially exposed portion 24a of the exhaust pipe 24 is connected to an upper end portion of the vertical support portion 32A. That is, the connecting bracket 35 is integrally attached to the partially exposed portion 24a of the exhaust pipe 24, and the upper end of the vertically supporting portion 32A is connected to the connecting bracket 35 by the two bolts 34. ing.

  A substantially L-shaped extended support portion 32B extends integrally from the vertical support portion 32A outward in the horizontal direction as viewed in the front-rear direction. The vertical surface portion 30a of the cover body 30 is connected to and fixed to one end of the extension support portion 32B by a single bolt 34. Therefore, the cover main body 30 is connected and fixed to the support member 32 by the three bolts 34.

  The notch cover 31 includes a mounting portion 31A in a horizontal position and a vertically extending portion 31B in a vertical position, and is formed of a substantially L-shaped plate in a front-rear direction. The mounting portion 31A is fixed by two bolts 36 while being mounted on the upper surface portion 30b of the cover main body 30. The bolt insertion hole 38 on the side of the attachment portion 31A is formed as a long hole extending in the lateral direction of the machine body. When the fastening of the bolts 36 is released, the notch cover 31 can be moved in the lateral direction of the machine body, and when the bolt 36 is fastened, the position of the notch cover 31 can be fixed. That is, the position of the notch cover 31 can be changed in the lateral direction within the range of the bolt insertion hole 38.

  A plurality of slits 37 for ventilation are formed in the vertically extending portion 31B of the cutout cover body 31. The plurality of slits 37 are formed to have a width smaller than the width of a human finger so that, for example, when the hood 4 is opened and closed, a finger of an operator does not enter.

  With this configuration, by adjusting the position of the notch cover 31, the distance between the notch cover 31 and the side wall 4 </ b> A of the hood 4 is set to an appropriate value so that the operator does not insert his hand. Can be adjusted. Further, while covering the cutout portion 25, the flow of the wind is not obstructed so that the cooling effect of the engine 5 is not deteriorated.

(Fuel tank support structure)
As a fuel tank for storing fuel to be supplied to the engine 5, a main fuel tank 40 integrally supported on the body, a supplementary mechanism provided for the main fuel tank 40, and a support mechanism for the body. And an auxiliary fuel tank 42 supported via the base 41. The main fuel tank 40 and the sub fuel tank 42 are made of, for example, a resin blow-molded product.

  The main fuel tank 40 and the sub fuel tank 42 are provided so as to be located side by side in the machine body width direction. That is, as shown in FIG. 8, the main fuel tank 40 is located on the left side of the fuselage of the clutch housing 9, and the sub fuel tank 42 is located on the right side of the fuselage of the clutch housing 9. The main fuel tank 40 and the sub fuel tank 42 are respectively provided using spaces on both left and right sides of the clutch housing 9 and below the boarding step 16.

  The main fuel tank 40 is provided as standard on a tractor, and is configured to be fixedly attached to a vehicle body. Although the support structure of the main fuel tank 40 is not described in detail, it is stably supported on the clutch housing 9 as the body frame F in a state where movement in the front-rear direction, the left-right direction, and the up-down direction is prevented. Have been. Although not shown, a dedicated fuel supply port is formed in the main fuel tank 40.

  On the other hand, the auxiliary fuel tank 42 is additionally provided as an option on the tractor, and may be attached to the vehicle body later. Therefore, the support mechanism 41 that supports the sub fuel tank 42 has a simple configuration.

  As shown in FIGS. 6 and 7, the support mechanism 41 for supporting the auxiliary fuel tank 42 supports and mounts the frame member 43 fixedly extended from the body frame F, the auxiliary fuel tank 42, and the auxiliary fuel tank 42. And a band member 45 for holding the auxiliary fuel tank 42 from above, and having both side ends connected to the frame member 43 for lifting.

  The auxiliary fuel tank 42 is provided in a substantially rectangular shape in plan view, and is supported with the bottom surface mounted on the receiving plate member 44. A fuel supply port 46 is formed on the upper surface of the sub-fuel tank 42 at the rear side of the machine body. The fuel supply port 46 is normally closed by a lid 47. The refueling port 46 is located at a position deviated from the boarding step 16 in a plan view, and can be refueled without being obstructed by the boarding step 16. A supply port 48 for supplying fuel to the engine 5 is formed in a lower portion of the auxiliary fuel tank 42 on the front left side of the fuselage.

  More specifically, a narrow frame member 43 extends in the front-rear direction from the clutch housing 9 as the body frame F to the laterally outward side. A receiving plate member 44 is placed and supported on the upper side of the frame member 43. As shown in FIG. 7, a narrow front-side support arm 43a extends in a cantilever manner from the middle part in the left-right direction of the frame member 43 toward the front of the fuselage. Further, a narrow rear-side support arm 43b extends in a cantilever shape from a position laterally outside the front-side support arm 43a toward the rear of the fuselage at a middle portion in the left-right direction of the frame member 43. .

  The auxiliary fuel tank 42 includes a plurality of insert nuts (not shown) in a state where the insert nuts are dispersed at appropriate locations on the bottom surface. A bolt is attached to the support plate 44 so as to be mounted and supported in a state of being integrated with the receiving plate member 44. A band member 45 extending in the lateral direction is provided near the center of the front and back of the auxiliary fuel tank 42, and both side ends of the band member 45 are fixed to the frame member 43 by fastening bolts and nuts.

  The receiving plate member 44 is mounted and supported on the upper portion of the frame member 43, and is connected to the connecting portions 43a1 and 43b1 of the extending ends of the support arms 43a and 43b on both the front and rear sides by using an insert nut and a bolt, and using the auxiliary fuel tank. 42 and are connected together. That is, the auxiliary fuel tank 42 and the receiving plate member 44 are fixed at two front and rear ends of the pair of support arms 43a and 43b. Thus, the auxiliary fuel tank 42 is supported by the frame member 43 in a state where the auxiliary fuel tank 42 is positioned.

  As described above, the auxiliary fuel tank 42 and the receiving plate member 44 are supported in an integrated state by fastening a plurality of insert nuts and bolts. The insert nut may be damaged if a strong force is continuously applied due to, for example, vibration of the body. However, in the above configuration, since the frame member 43 and the receiving plate member 44 are supported via the narrow support arms 43a and 43b extending in a cantilever manner on both front and rear sides, for example, the frame member 43 and the receiving plate member 44 are generated from the engine 5 or the like. The vibration of the airframe is absorbed to some extent through the narrow support arms 43a and 43b, and can be prevented from being transmitted to the receiving plate member 44 and the auxiliary fuel tank 42 as they are. As a result, the insert nut is less likely to be damaged in a short period of time. Therefore, in this embodiment, the support arms 43a and 43b function as a vibration absorbing member that absorbs vibration of the body.

[Fuel supply route]
Next, the fuel supply path will be described.
As shown in FIG. 8, the tractor communicates with a main fuel supply path L1 for supplying fuel to the engine 5 from a supply port 49 provided at a lower part of the main fuel tank 40, and a middle part of the main fuel supply path L1. A sub-fuel supply passage L2 that is connected to supply fuel to the engine 5 from a supply port 48 provided at a lower portion of the sub-fuel tank 42; And a check valve 50 that allows the fuel to flow to the opposite direction and prevents the flow in the opposite direction.

  Also, a connection point Q between the main fuel supply path L1 and the sub fuel supply path L2, a path portion 51 from the supply port 49 of the main fuel supply path L1 to the connection point Q, and a supply port 48 of the sub fuel supply path L2. Each of the route portions 52 up to the connection point Q is set at substantially the same height as the lower end portions of the main fuel tank 40 and the sub fuel tank 42. Each of the path portions 51 and 52 is provided so as to be located below the clutch housing 9.

  Specifically, a supply port 49 is formed at a lower portion on the right side of the main fuel tank 40, and a supply port 48 is formed at a lower portion on the left side of the sub fuel tank 42. The supply port 49 of the main fuel tank 40 and the supply port 48 of the sub fuel tank 42 are connected by a communication pipe 53.

  As shown in FIGS. 9 and 10, the flow of the fuel from the side of the auxiliary fuel tank 42 to the side of the main fuel tank 40 is allowed at an intermediate portion of the communication pipe 53, and the flow from the main fuel tank 40 to the side of the auxiliary fuel tank 42. A check valve 50 for interfering with the fuel flow is provided. Further, at a position closer to the main fuel tank 40 than the check valve 50 in the communication pipe 53 and close to the main fuel tank 40, the left and right side passage portions of the communication pipe 53 and the supply path portion for the engine 5 are respectively connected. A substantially T-shaped pipe joint 54 is provided.

  The location where the pipe joint 54 is located corresponds to the connection point Q, and includes a path portion 51 from the supply port 49 of the main fuel tank 40 to the pipe joint 54 and a fuel supply path 55 from the pipe joint 54 to the engine 5. The main fuel supply passage L1 is configured. The sub fuel supply path L2 is constituted by a path portion 52 between the supply port 48 of the sub fuel tank 42 and the pipe joint 54, and a fuel supply path 55 from the pipe joint 54 to the engine 5. The surplus fuel not consumed by the engine 5 is returned to the main fuel tank 40 via a return pipe (not shown).

  As shown in FIG. 9, the communication pipe 53 is provided below the clutch housing 9 so as to extend in the left-right direction. Thus, the communication pipe 53 is provided in a state where it is located at a lower position below the clutch housing 9 over the entire range. Therefore, the connection point Q between the main fuel supply path K1 and the sub fuel supply path L2, the path portion 51 from the supply port 49 of the main fuel supply path L1 to the connection point Q, and the supply port 48 of the sub fuel supply path L2 Each of the route portions 52 up to the connection point Q is set at substantially the same height as the lower end portions of the main fuel tank 40 and the sub fuel tank 42.

  The communication pipe 53 is covered from below by a cover member 56 formed in a substantially U-shape in a side view. The cover member 56 is fixed to a support portion 57 formed on the lower surface side of the clutch housing 9 by fastening a bolt 58. The cover member 56 can prevent damage to the communication pipe 53 due to contact with soil, stones, and the like in the field.

  As shown in FIG. 6, the breather hose 59 of the auxiliary fuel tank 42 has one end of a rubber hose connected to the connection port 60 on the tank side, and the middle part is held at a high position by the holder 61, and the other end is low. The opening is crushed at the position to prevent dust from entering. As described above, a simple structure using only a rubber hose, instead of a strong support structure using a metal material, is configured to be able to respond to the machine body by retrofitting.

[Reference Embodiment] In the above embodiment, narrow support arms 43a and 43b extending in a cantilever manner are provided from the middle part in the left-right direction of the frame member 43 to the front part and the rear part, respectively, as the vibration absorbing member. However, instead of this configuration, for example, a frame member 43 may be provided with an elastic body such as a rubber material as the vibration absorbing member, and the receiving plate member may be supported via the elastic body. Other materials may be used. In short, what is necessary is just to absorb the vibration of the body and support the receiving plate member, that is, the auxiliary fuel tank.

[Embodiment] ( 1 ) In the above-described embodiment, the main fuel tank 40 and the sub fuel tank 42 are provided so as to be arranged side by side in the lateral width direction of the machine body. The configuration may be such that the main fuel tank 40 and the auxiliary fuel tank 42 are arranged in the vertical direction, or the main fuel tank 40 and the auxiliary fuel tank 42 are arranged in the vertical direction.

( 2 ) In the above embodiment, the work vehicle is applied to a tractor. However, the work vehicle is not limited to the tractor, and may be another type of agricultural work vehicle such as a combine or a rice transplanter. The work vehicle is not limited to a work vehicle, and may be another work vehicle such as a construction machine.

  The present invention can be applied to a work vehicle provided with a main fuel tank and a sub fuel tank.

Reference Signs List 4 bonnet 4A side wall 5 engine 7 cabin 9 clutch housing 10 transmission case 20 ceiling 21 first plate member 21a connecting plate surface portion 21b outer end side covering portion 22 second plate member 22b outer end surface 24 exhaust pipe 25 cutout 29 Heat shield cover 31B Vertically extending portion 40 Main fuel tank 41 Support mechanism 42 Sub fuel tank 43 Frame member 43a, 43b Vibration absorbing member 44 Receiving plate member 45 Band member 48 Supply port 49 Supply port 50 Check valve L1 Main fuel supply Road L2 Secondary fuel supply path Q Connection point

Claims (6)

A main fuel tank supported integrally with the fuselage,
An auxiliary fuel tank that is provided auxiliary to the main fuel tank and that is supported via a support mechanism with respect to the fuselage;
The support mechanism,
A frame member fixedly extended from the body frame,
A receiving plate member for mounting and supporting the sub fuel tank, and for fixing the sub fuel tank with screws,
A band member for holding the auxiliary fuel tank from above, and a lifting prevention member having both side ends connected to the frame member;
And a vibration absorbing member provided on said frame member for absorbing the vibration of the fuselage, before Symbol vibration absorbing member, extending in a direction crossing the longitudinal direction of the frame member from the frame member, and the frame A work vehicle, which is a support arm extending cantilevered from a member and supporting the sub fuel tank . The support arm has a first support arm and a second support arm,
  The first support arm is provided on one end in the width direction of the frame member in a cantilever manner, and the second support arm is provided in a cantilever shape on the other end in the width direction of the frame member, The work vehicle according to claim 1, wherein the first support arm and the second support arm are provided at different positions in a longitudinal direction of the frame member. The main fuel tank and the sub fuel tank are provided in a state where they are located side by side in the aircraft lateral width direction,
A main fuel supply path for supplying fuel to an engine from a supply port provided at a lower part of the main fuel tank, and a supply part connected to a middle part of the main fuel supply path and provided at a lower part of the sub fuel tank. An auxiliary fuel supply passage for supplying fuel to the engine from a mouth, and a reverse fuel supply passage provided in the auxiliary fuel supply passage for allowing fuel to flow from the auxiliary fuel tank to the engine and preventing flow in the reverse direction. With a stop valve,
A connection point between the main fuel supply path and the sub fuel supply path, a path portion from the supply port of the main fuel supply path to the connection point, and from the supply port to the connection point of the sub fuel supply path. 3. The work vehicle according to claim 1, wherein each of the path portions is set at substantially the same height as lower end portions of the main fuel tank and the sub fuel tank. 4. The aircraft includes an engine, a clutch housing connected to a rear portion of the engine, and a transmission case connected to a rear portion of the clutch housing,
Each of a path portion from the supply port of the main fuel supply path to the connection point and a path portion of the sub fuel supply path from the supply port to the connection point are located below the clutch housing. The work vehicle according to claim 3 , which is provided in a state. An engine and an exhaust pipe that guides exhaust gas from the engine outward through a lower portion of a side wall of the hood are provided inside a hood provided at a front portion of the fuselage.
At the lower end of the side wall of the bonnet, a notch is formed to be recessed to secure a gap between the exhaust pipe.
A heat shield cover is provided to cover an outer side of a portion of the exhaust pipe that is exposed more outward than a side wall of the hood,
The work vehicle according to any one of claims 1 to 4 , wherein the heat shield cover includes a vertically extending portion that covers a lateral side outside of the cutout portion of the bonnet. There is a cabin that covers the upper part of the operating part of the aircraft,
The ceiling portion of the cabin includes a first plate member located on the upper outer side, and a second plate member located on the lower inner side, and the first plate member and the second plate member. In a state where an internal space is formed between the outer peripheral portions of the first plate member and the second plate member,
An outer peripheral portion of each of the first plate member and the second plate member is connected to the plate surfaces of the first plate member and the second plate member over a predetermined width,
The first plate member is provided in a state where a connection plate surface portion connected to an outer peripheral portion of the second plate member and an outer end side covering portion covering an outer end surface of the second plate member are continuously connected in series. The work vehicle according to any one of claims 1 to 5 , wherein:

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