JP2017226321A - Working machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a working machine which can securely support a sub fuel tank over a long time even if vibration occurs in a machine body while simplifying a sub fuel tank support structure.SOLUTION: A working machine includes: a main fuel tank supported while integrally held with a machine body; and a sub fuel tank 42 supported on the machine body through a support mechanism 41. The support mechanism 41 includes: a frame member 43 fixedly extending from a machine body frame; a receiving plate member 44 on which the sub fuel tank 42 is placed and supported and to which the sub fuel tank 42 is screwed; a lifting prevention band member 45 which presses the sub fuel tank 42 from above and is connected with the frame member 43 at both end parts; and vibration absorption members 43a, 43b which are provided at the frame member 43 and absorb vibration of the machine body.SELECTED DRAWING: Figure 7

Description

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

  Conventionally, there has been a case where the main fuel tank is supported by the fixing part on the airframe side, and the sub fuel tank is provided on the lower surface side of the hood top plate via a substantially box-shaped storage member. (For example, refer to Patent Document 1).

Japanese Utility Model Publication No.59-180920

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

  In such a configuration in which the auxiliary fuel tank is supported on the bonnet having insufficient support strength, there is a possibility that the supporting portion of the auxiliary fuel tank may be damaged due to the vibration of the airframe as the use continues. As a configuration for eliminating such disadvantages, a configuration in which the auxiliary fuel tank is directly supported by the fuselage frame has been considered. For example, the auxiliary fuel tank is integrally and firmly attached to the body frame using a box-shaped support portion that surrounds the entire auxiliary fuel tank so that the auxiliary fuel tank can be held in the horizontal and vertical directions. However, with such a configuration, the support structure is complicated, resulting in high costs and a disadvantage in that it takes time and effort to install.

  Accordingly, it has been desired to simplify the auxiliary fuel tank support structure and to support the auxiliary fuel tank well over a long period of time even if vibrations occur in the airframe.

The characteristic configuration of the work vehicle according to the present invention includes a main fuel tank supported in a state of being integrally held with respect to the airframe,
An auxiliary fuel tank provided as an auxiliary to the main fuel tank and supported through a support mechanism with respect to the airframe;
The support mechanism is
A frame member fixedly extended from the fuselage frame;
A receiving plate member for mounting and supporting the auxiliary fuel tank and to which the auxiliary fuel tank is fixed with screws;
A band member for preventing the lifting from the upper side while holding the auxiliary fuel tank from above and having both end portions connected to the frame member;
And a vibration absorbing member that is provided on the frame member and absorbs vibrations of the airframe.

According to the present invention, the auxiliary fuel tank is placed and supported on the receiving plate member and fixed with screws. Further, the auxiliary fuel tank is pressed and held from above by a band member having both end portions connected to the frame member. The receiving plate member is placed on the frame member.
The backing plate member has a simple configuration that only supports the auxiliary fuel tank, and the auxiliary fuel tank can be supported on the airframe by such a simple support mechanism of the backing plate member and the band member.

  Since the vibration absorbing member that absorbs the vibration is provided in the frame member, for example, vibration generated by the mounted engine or the like is absorbed by the vibration absorbing member and hardly transmitted to the backing plate member. As a result, it is possible to avoid disadvantages such as the location where the auxiliary fuel tank is screwed and fixed to the receiving plate member due to vibration. The vibration absorbing member extends from the frame member toward the receiving plate member and has a low rigidity connecting member that allows relative minute displacement, or is interposed between the frame member and the receiving plate member. There are elastic bodies such as rubber.

  Therefore, it is possible to support the auxiliary fuel tank satisfactorily for a long period of time even if vibration occurs in the airframe while simplifying the supporting structure of the auxiliary fuel tank.

In the present invention, the main fuel tank and the sub fuel tank are provided in a state of being aligned in the lateral width direction of the fuselage,
A main fuel supply passage for supplying fuel to the engine from a supply port provided at the lower portion of the main fuel tank, and a supply provided at the lower portion of the sub fuel tank connected to the middle portion of the main fuel supply passage. An auxiliary fuel supply passage for supplying fuel to the engine from the mouth, and a reverse passage that is provided in the auxiliary fuel supply passage, allows fuel flow from the auxiliary fuel tank to the engine side, and prevents reverse flow. With a stop valve,
Connection point between the main fuel supply path and the sub fuel supply path, a path part from the supply port of the main fuel supply path to the connection point, and from the supply port of the auxiliary fuel supply path to the connection point It is preferable that each of the path portions is set at substantially the same height as the lower ends of the main fuel tank and the sub fuel tank.

  According to this configuration, the fuel is supplied to the engine through the path portion from the lower supply port of the main fuel tank to the connection location in the main fuel supply path. On the other hand, fuel is supplied to the engine through a path portion from the supply port at the lower part of the auxiliary fuel tank to the connection point in the auxiliary fuel supply path. Since the connection points and the respective route portions are set to substantially the same height as the lower ends of the main fuel tank and the auxiliary fuel tank, even if the remaining amount of fuel in the main fuel tank and the auxiliary fuel tank decreases, the route portion Since the fuel remains in the fuel, there is no disadvantage such as the inflow of air and the fuel supply stagnation, and the fuel supply can be performed smoothly. Further, when the fuel is replenished, a check valve is provided in the auxiliary fuel supply passage, so that even if fuel is supplied to the main fuel tank, it does not flow into the auxiliary fuel tank side. Therefore, after the fuel is supplied to the main fuel tank until it is full, the sub fuel tank can also be supplied until the fuel is full.

In the present invention, the fuselage includes an engine, a clutch housing connected to the rear part of the engine, and a transmission case connected to the rear part of the clutch housing,
A path portion from the supply port to the connection location of the main fuel supply path and a path portion from the supply port to the connection location of the sub fuel supply path are located below the clutch housing. It is suitable if it is provided in a state.

  According to this configuration, a path portion in which fuel is supplied to the engine in each of the main fuel tank and the sub fuel tank is provided at a low portion of the vehicle body using the lower region of the clutch housing. The main fuel tank and the sub fuel tank can be distributed and arranged on the left and right sides of the vehicle body in a well-balanced state by using the empty areas on the left and right sides of the clutch housing.

In the present invention, an engine and an exhaust pipe for guiding the exhaust from the engine to the outside through the lower part of the side wall of the bonnet are provided inside the bonnet provided at the front part of the airframe,
A notch that is recessed to form a clearance between the exhaust pipe and the lower end of the side wall of the bonnet is formed,
A heat-insulating cover that covers an outer side of a portion of the exhaust pipe that is exposed outward from a side wall portion of the bonnet;
It is preferable that the heat shield cover is provided with a vertically extending portion that covers a lateral outer side of the notch portion of the bonnet.

  According to this configuration, the exhaust pipe is extended from the inside of the bonnet so as to be exposed to the outside through the lower part of the side wall of the bonnet. 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 hardly affected by the heat of the exhaust pipe.

  Since the portion of the exhaust pipe that is exposed outward from the bonnet is covered with the heat shield cover, the heat of the exhaust pipe can be prevented from being released by being shielded by the heat shield cover. The bonnet is provided so that it can be largely opened for maintenance around the engine. When the bonnet is opened and closed, if a notch is formed at the lower end of the side wall of the bonnet, it is conceivable that the user tries to open and close the bonnet by hooking his hand. In this configuration, since the heat shield cover is provided with a vertically extending portion that covers the lateral outer side of the notch, a hand cannot be inserted below the notch in order to open and close the bonnet. As a result, it is possible to prevent accidental touching of the cutout portion, which has become hot due to the influence of the exhaust pipe.

In the present invention, a cabin that covers the upper part of the operating part of the fuselage 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 the state of forming an internal space between the outer peripheral portions of the first plate member and the second plate member are connected,
The 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 in which a connecting plate surface portion connected to the outer peripheral portion of the second plate member and an outer end side covering portion covering the outer end surface of the second plate member are continuously connected. It is preferable that

  According to this configuration, the cabin ceiling portion is composed of two upper and lower plate members in a state in which an internal space is formed in the upper and lower intermediate portions, so that the strength is high and the heat insulation effect is high while being lightweight. . Moreover, the outer peripheral portions of the first plate member and the second plate member in the ceiling are connected to each other between the plate surfaces of the first plate member and the second plate member over a predetermined width, and the first plate member is the second plate member. The connecting plate surface portion connected to the outer peripheral portion and the outer end side covering portion that covers the outer end surface of the second plate member are provided in a series.

  That is, since the plate surfaces of the first plate member and the second plate member are connected to each other over a predetermined width, the connection strength is increased, and the first plate member is 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, the portion facing the outside of the mating surface portion of the first plate member and the second plate member is in the downward state Therefore, there is little possibility that rainwater or the like enters from the mating surface portion.

  Therefore, there is little risk of damage due to moisture intrusion, and 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. It is a disassembled perspective view which shows the attachment state of a heat shield cover. It is a perspective view which shows the attachment state of a heat shield cover. It is a perspective view of a sub fuel tank arrangement part. It is a disassembled perspective view of an auxiliary fuel tank arrangement part. It is a figure which shows the connection state of a fuel tank. It is a disassembled perspective view which shows the support structure of a communicating pipe. It is a perspective view which shows the support structure of a communicating 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 machine body 3 having a pair of left and right steering operations and a front wheel 1 that can be driven and a pair of left and right driveable rear wheels 2, and is configured as a four-wheel drive type. . A bonnet 4 is provided at the front of the traveling machine body 3, and an engine 5 and various intake and exhaust devices associated therewith are provided inside the bonnet 4. A driving unit 6 is provided at the rear of the traveling machine body 3, and the driving unit 6 is covered with a cabin 7 on the outer side.

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

  At the rear of the mission case 10 are a link mechanism 11 for connecting a working device (not shown) such as a rotary tiller or a plow so that it can be moved up and down, and a hydraulic lift cylinder 12 that drives the link mechanism 11 to swing up and down. , And a power take-out shaft 13 for power transmission to the working device.

  The power of the engine 5 is transmitted to the front wheels 1 and the rear wheels 2 through a transmission mechanism (not shown) housed in the clutch housing 9 and the transmission case 10 and to the power take-out shaft 13 through the transmission mechanism. It 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. A flat boarding step 16 on which the driver gets on the front side of the driver seat 15 is used for front wheel steering. The steering wheel 17 and a driving operation unit 18 having various other operation tools are provided.

〔cabin〕
The cabin 7 is entirely supported by a frame-like cabin frame 19, and 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-like member. The cabin 7 as a whole forms a substantially box-shaped living space that covers the upper part of the operating unit 6.

  As shown in FIG. 2, the ceiling portion 20 of the cabin 7 includes a first plate member 21 located on the upper outer side and a second plate member 22 located on the lower inner side, and the first plate 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. By comprising in this way, it will have sufficient support strength, though it is 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 peripheral portions of the first plate member 21 and the second plate member 22 are connected to the plate surfaces of the first plate member 21 and the second plate member 22 over a predetermined width. Rather than abutting and connecting the end surfaces of the two plate members, as shown in FIG. 3, the connecting plate surface portion 22 a of the outer peripheral portion of the second plate member 22 and the outer peripheral portion of the first plate member 21 are connected. The plate surface portion 21a is bonded and connected with an adhesive. In addition, 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 covering the outer end surface 22b of the second plate member 22 are connected in series. That is, the first plate member 21 positioned on the upper outer side is provided so that the outer peripheral surface 22b of the second plate member 22 is covered with a substantially L-shaped outer peripheral section. The 1st board member 21 and the 2nd board member 22 are connected so that the location which faces outward among the mating surfaces 23 of the 1st board member 21 and the 2nd board member 22 may be in a downward state. As a result, it becomes easy to avoid rainwater entering from the mating surface 23.

[Exhaust structure]
Inside the bonnet 4, an exhaust pipe 24 that guides the exhaust (combustion exhaust gas) of the engine 5 outward through the lower part of the side wall portion 4 </ b> A of the bonnet 4 is provided. As shown in FIG. 4, a notch 25 is formed in the lower end portion of the side wall portion 4 </ b> A of the bonnet 4 so as to be recessed in order to ensure a gap with the exhaust pipe 24. The exhaust pipe 24 extends from the inside of the bonnet 4 toward the outside of the bonnet 4 through the lower part of the notch 25. The exhaust pipe 24 extended to the outside of the bonnet 4 is bent in a substantially arc shape so as to have a vertically oriented posture, and further extended upward to a position higher than the upper portion 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 position extending outwardly through the lower part of the notch 25 of the bonnet 4 to an upper and lower halfway position of the upwardly extending part 24 </ b> A. It has been. The cylindrical cover 26 is formed to have a larger diameter than the exhaust pipe 24, and a large number of vent holes 27 are formed on the outer periphery. As shown in FIG. 1, the upper part of the exhaust pipe 24 protrudes upward from the upper end part of the cylindrical cover 26, and the exhaust port 28 is formed in the upper end part. The cylindrical cover 26 is appropriately supported at the exhaust pipe 24 by a bracket (not shown). By providing the cylindrical cover 26, the possibility that the high-temperature exhaust pipe 24 is exposed to the outside and the operator contacts is reduced.

  And the heat insulation cover 29 which covers the outer side of the site | part exposed outside rather than the side wall part 4A of the bonnet 4 in the exhaust pipe 24 is provided. In addition, as shown in FIGS. 4 and 5, the heat shield cover 29 is directed to the outside of the side wall 4 </ b> A through the exhaust pipe 24 below the notch 25 formed in the side wall 4 </ b> A of the bonnet 4. It is provided so that the partially exposed location 24a which is the location extended and is not covered with the cylindrical cover 26 may be covered from an outer side.

  The heat shield cover 29 includes a cover main body 30 that covers a part of the exposed portion 24 a from the outside, a cutout cover body 31 that is attached to the top of the cover main body 30 and covers the lateral outer side of the cutout 25 of the bonnet 4, It has.

  As shown in FIG. 4, the cover main body 30 is formed by bending a plate body, and a vertical surface portion 30 a in a vertical posture covering the lateral outer 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 partial exposure is provided in a state of being connected to the lower end portion of the vertical surface portion 30a. The lower surface part 30c of the horizontal attitude | position which covers the downward side of the location 24a, and the body connection part 30d provided in the vertical attitude | position in the state connected to the machine direction inner side edge part of a lower surface part are provided.

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

  A substantially L-shaped extension support portion 32B is integrally extended from the vertical support portion 32A outward in the lateral direction as viewed in the front-rear direction. The vertical surface portion 30a of the cover main body 30 is connected 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 cutout cover body 31 includes a horizontal mounting portion 31 </ b> A and a vertical extending portion 31 </ b> B in a vertical orientation, and is configured as a substantially L-shaped plate-like body in the front-rear direction view. The attachment portion 31 </ b> A is fixed by two bolts 36 in a state of being placed on the upper surface portion 30 b of the cover main body 30. The bolt insertion hole 38 on the attachment portion 31A side is formed as a long long hole along the left-right direction of the machine body. When the fastening of the bolt 36 is released, the cutout cover body 31 can be moved in the lateral direction of the machine body, and when the bolt 36 is fastened, the position of the cutout cover body 31 can be fixed. That is, the position of the cutout cover body 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 31 </ b> B of the cutout cover body 31. The plurality of slits 37 are formed with a width smaller than the width of human fingers so that the fingers of the operator do not enter when the bonnet 4 is opened and closed, for example.

  With this configuration, by adjusting the position of the notch cover body 31, the interval between the notch cover body 31 and the side wall 4A of the bonnet 4 is set to an appropriate value so that the operator does not insert his / her hand. Can be adjusted. Further, while covering the notch 25, the flow of the wind is not hindered 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 that is integrally supported with respect to the fuselage, and a support mechanism that is provided to the main fuel tank 40 and that is auxiliary to the fuselage. An auxiliary fuel tank 42 supported via 41 is provided. The main fuel tank 40 and the sub fuel tank 42 are constituted by, for example, a resin blow molded product.

  The main fuel tank 40 and the auxiliary fuel tank 42 are provided in a state of being arranged side by side in the body width direction. That is, as shown in FIG. 8, the main fuel tank 40 is disposed on the left side of the body of the clutch housing 9, and the sub fuel tank 42 is disposed on the left and right sides in a state of being positioned on the right side of the body of the clutch housing 9. The main fuel tank 40 and the sub fuel tank 42 are respectively arranged on the left and right sides of the clutch housing 9 and using the space below the boarding step 16.

  The main fuel tank 40 is equipped as standard on the tractor, and is configured to be attached to the vehicle body in a fixed state. Although the support structure of the main fuel tank 40 will not be described in detail, the clutch housing 9 as the fuselage frame F is stably supported in a state where movement in the front-rear direction, the left-right direction, and the up-down direction is prevented. Has been. Although not shown, the main fuel tank 40 has a dedicated fuel filler opening.

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

  As shown in FIGS. 6 and 7, the support mechanism 41 that supports the auxiliary fuel tank 42 mounts and supports the frame member 43 that is fixedly extended from the body frame F, the auxiliary fuel tank 42, and the auxiliary fuel tank 42. Is provided with a receiving plate member 44 that is fixed with screws, and a band member 45 for holding the auxiliary fuel tank 42 from above and for preventing lifting from both ends connected to the frame member 43.

  The auxiliary fuel tank 42 is provided in a substantially rectangular shape in plan view, and is supported in a state where the bottom surface is placed on the receiving plate member 44. A refueling port 46 is formed on the upper surface of the rear side portion of the auxiliary fuel tank 42. The fuel filler 46 is normally closed by a lid 47. The refueling port 46 is located at a position deviated from the boarding step 16 in 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 at the lower part of the left side portion of the front portion of the sub fuel tank 42.

  In other words, a frame member 43 having a narrow width in the front-rear direction is extended from the clutch housing 9 as the body frame F toward the laterally outer 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 support arm 43 a is extended in a cantilevered manner from the middle in the left-right direction of the frame member 43 toward the front of the machine body. Further, a rear-side support arm 43b having a narrow width extends in a cantilevered manner from the laterally outer side of the frame member 43 in the left-right direction and toward the rear of the machine body from the front-side support arm 43a. .

  The auxiliary fuel tank 42 is provided with a plurality of insert nuts (not shown) in a state of being dispersed at appropriate locations on the bottom surface, and with respect to the plurality of insert nuts with respect to the mounting portion 44a provided on the backing plate member 44. Are mounted and supported in a state of being integrated with the receiving plate member 44. In addition, a band member 45 extending in the lateral direction is provided in the vicinity of the front and rear center portion of the auxiliary fuel tank 42, and both end portions of the band member 45 are fixed to the frame member 43 by fastening bolts and nuts.

  The backing plate member 44 is placed and supported on the upper portion of the frame member 43, and the auxiliary fuel tank is connected to the connecting portions 43a1 and 43b1 of the extending end portions of the supporting arms 43a and 43b on both the front and rear sides by insert nuts and bolts. 42 and is connected together. That is, the auxiliary fuel tank 42 and the receiving plate member 44 are fixed at two positions in the front and rear at the ends of the pair of support arms 43a and 43b. As a result, the sub fuel tank 42 is supported by the frame member 43 in a positioned state.

  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. For example, the insert nut may be damaged if a strong force is continuously applied due to vibration of the airframe or the like. However, in the above configuration, the frame member 43 and the receiving plate member 44 are supported by the narrow support arms 43a and 43b extending in a cantilevered manner on both the front and rear sides. It is possible to avoid the vibration of the machine body being absorbed to some extent via the narrow support arms 43a and 43b and 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 vibration absorbing members that absorb vibrations of the airframe.

[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 portion of the main fuel tank 40, and a middle portion of the main fuel supply path L1. An auxiliary fuel supply path L2 that is connected to supply fuel to the engine 5 from a supply port 48 provided in the lower part of the auxiliary fuel tank 42, and is provided in the auxiliary fuel supply path L2, and from the auxiliary fuel tank 42 to the engine 5 side. And a check valve 50 that allows the fuel to flow in the reverse direction and prevents reverse flow.

  Further, from the connection point Q between the main fuel supply path L1 and the auxiliary 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 auxiliary fuel supply path L2. Each of the route portions 52 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 in a state of being located below the clutch housing 9.

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

  As shown in FIGS. 9 and 10, fuel is allowed to flow from the auxiliary fuel tank 42 side to the main fuel tank 40 side in the middle of the communication pipe 53, and from the main fuel tank 40 to the auxiliary fuel tank 42. A check valve 50 for intervening the flow of the fuel is interposed. Further, the left and right side passage portions of the communication pipe 53 and the supply passage portion for the engine 5 are connected to the main fuel tank 40 side of the communication pipe 53 and closer to the main fuel tank 40 than the check valve 50. A substantially T-shaped pipe joint 54 is provided.

  A place where the pipe joint 54 is located corresponds to the connection place Q, and is constituted by 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 path L1 is configured. The secondary fuel supply path L2 is constituted by a path portion 52 from the supply port 48 of the secondary fuel tank 42 to the pipe joint 54 and a fuel supply path 55 from the pipe joint 54 to the engine 5. The surplus fuel that is 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 arranged in a state of being positioned below the clutch housing 9 and extending in the left-right direction. Thus, the communication pipe 53 is provided in a state of being located at a lower position on the lower side of the clutch housing 9 over the entire range. Accordingly, from the connection point Q between the main fuel supply path K1 and the auxiliary 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 auxiliary fuel supply path L2. Each of the route portions 52 to the connection point Q is set to be 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 bolts 58. The cover member 56 can prevent the communication pipe 53 from being damaged by contact with soil, stones, or the like in the field.

  As shown in FIG. 6, the breather hose 59 of the auxiliary fuel tank 42 has one end of the rubber hose connected to the connection port 60 on the tank side, and the middle part is held at a high place by a holding tool 61 and the other end side is low. It is formed so as to crush the opening at the position to prevent the intrusion of dust. Thus, it is set as the structure which can respond by retrofit with respect to a body as a simple structure only of a rubber hose instead of the firm support structure using a metal material.

[Another embodiment]
(1) In the above embodiment, as the vibration absorbing member, the narrow support arms 43a and 43b that are cantilevered from the middle part in the left-right direction of the frame member 43 to the front side and the rear side are provided. However, instead of this configuration, for example, the frame member 43 may be provided with an elastic body such as a rubber material and the receiving plate member may be supported via the elastic body. It may be made of any material. In short, it may be anything that absorbs the vibration of the airframe and supports the backing plate member, that is, the auxiliary fuel tank.

(2) In the above-described embodiment, the main fuel tank 40 and the auxiliary fuel tank 42 are provided in a state where they are arranged side by side in the lateral width direction of the fuselage, but the main fuel tank 40 and the auxiliary fuel tank are replaced with this configuration. 42 may be provided in a state in which the main fuel tank 40 and the sub fuel tank 42 are arranged in the vertical direction.

(3) In the above embodiment, the work vehicle applied to a tractor is shown. However, the work vehicle is not limited to a tractor, and may be another type of agricultural work vehicle such as a combine or a rice transplanter. Other work vehicles such as construction machines may be used.

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

4 Bonnet 4A Side wall part 5 Engine 7 Cabin 9 Clutch housing 10 Transmission case 20 Ceiling part 21 First plate member 21a Connection plate surface part 21b Outer end side cover part 22 Second plate member 22b Outer end face 24 Exhaust pipe 25 Notch 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 Back 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 (5)

A main fuel tank supported in a state of being held integrally with the airframe;
An auxiliary fuel tank provided as an auxiliary to the main fuel tank and supported through a support mechanism with respect to the airframe;
The support mechanism is
A frame member fixedly extended from the fuselage frame;
A receiving plate member for mounting and supporting the auxiliary fuel tank and to which the auxiliary fuel tank is fixed with screws;
A band member for preventing the lifting from the upper side while holding the auxiliary fuel tank from above and having both end portions connected to the frame member;
A work vehicle provided with a vibration absorbing member that is provided on the frame member and absorbs vibrations of the airframe. The main fuel tank and the auxiliary fuel tank are provided in a state of being aligned in the lateral width direction of the fuselage,
A main fuel supply passage for supplying fuel to the engine from a supply port provided at the lower portion of the main fuel tank, and a supply provided at the lower portion of the sub fuel tank connected to the middle portion of the main fuel supply passage. An auxiliary fuel supply passage for supplying fuel to the engine from the mouth, and a reverse passage that is provided in the auxiliary fuel supply passage, allows fuel flow from the auxiliary fuel tank to the engine side, and prevents reverse flow. With a stop valve,
Connection point between the main fuel supply path and the sub fuel supply path, a path part from the supply port of the main fuel supply path to the connection point, and from the supply port of the auxiliary fuel supply path to the connection point 2. The work vehicle according to claim 1, wherein 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. The fuselage includes an engine, a clutch housing connected to the rear part of the engine, and a transmission case connected to the rear part of the clutch housing,
A path portion from the supply port to the connection location of the main fuel supply path and a path portion from the supply port to the connection location of the sub fuel supply path are located below the clutch housing. The work vehicle according to claim 2, which is provided in a state. Inside the bonnet provided at the front of the fuselage is provided with an engine and an exhaust pipe for guiding the exhaust from the engine to the outside through the lower part of the side wall of the bonnet,
A notch that is recessed to form a clearance between the exhaust pipe and the lower end of the side wall of the bonnet is formed,
A heat-insulating cover that covers an outer side of a portion of the exhaust pipe that is exposed outward from a side wall portion of the bonnet;
The work vehicle according to any one of claims 1 to 3, wherein the heat shield cover includes a vertically extending portion that covers a lateral outer side of the notch portion of the bonnet. A cabin covering the upper part of the operating part of the fuselage 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 the state of forming an internal space between the outer peripheral portions of the first plate member and the second plate member are connected,
The 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 in which a connecting plate surface portion connected to the outer peripheral portion of the second plate member and an outer end side covering portion covering the outer end surface of the second plate member are continuously connected. The work vehicle according to any one of claims 1 to 4.

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