JP2009067144A - Maintenance vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve purification of introduced outside air to a pre-cleaner by devising a simple arrangement structure without using a special purifying device, and to simply perform cleanup of the introduced outside air to a canister by using an existing structure when the canister is included. <P>SOLUTION: The pre-cleaner 91 is provided at the upper side of an intake air path of an air cleaner 90. The outside air intake 91a of the pre-cleaner 91 is arranged to face the upper surface side of a fuel tank 46 in a downward position with a void for taking in outside air d between the upper surface of the fuel tank 46. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a work vehicle in which a pre-cleaner is provided on the upper side of an intake path of an air cleaner.

As mentioned above, a work vehicle equipped with an air cleaner and a pre-cleaner is useful in that it is easier to clean the gas supplied to the engine than a vehicle equipped with only an air cleaner, especially when used in dust-covered areas. It is suitable for use as an air cleaning means for work vehicles.
As a work vehicle provided with this type of air cleaner and pre-cleaner, the air cleaner and the pre-cleaner are simply arranged close to each other in the hood (see Patent Document 1).
Also, although it is not a work vehicle equipped with an air cleaner and a pre-cleaner, it is equipped with a canister that adsorbs evaporated fuel from the fuel tank and uses the suction power of the air cleaner when supplying vaporized fuel in the fuel tank to the engine. A vehicle equipped with means for sucking vaporized fuel on the canister side is also known (see Patent Document 2).

Japanese Patent Laying-Open No. 2006-273309 (paragraph numbers [0036] and [0041] and FIGS. 3 and 4) JP-A-7-189817 (paragraph numbers [0016], [0019] and FIG. 1)

In the structure described in Patent Document 1, although a technique is disclosed in which outside air taken into the precleaner is purified to some extent by the dust collecting and storing action of the precleaner itself and sent to the air filter, it is sucked into the prefilter. A technique related to dust removal is not disclosed.
In addition, in the structure having a canister as described in Patent Document 2, the introduction of outside air into the canister is merely a provision of an opening for introduction, and the outside air is to be cleaned and introduced. No technology has been disclosed.

  The present invention is to enable the purification of the outside air introduced into the precleaner by achieving a simple arrangement structure without using a special purification device, and when the canister is provided, the outside air introduced into the canister The purpose of this is to make it easy to clean the structure using the existing structure.

The technical means of the present invention taken in order to solve the above problems are as follows.
[Solution 1]
As described in claim 1, the work vehicle of the present invention is provided with a precleaner on the upper side of the intake path of the air cleaner, and an external air intake port of the precleaner is opposed to the upper surface side of the fuel tank in a downward posture. In addition, an outside air intake gap is disposed between the upper surface of the fuel tank and the upper surface of the fuel tank.

[Action and effect]
According to the said structure, there exists the following effect | action and effect.
That is, the pre-cleaner is configured to face the upper surface side of the fuel tank with the outside air intake port facing downward, and to form an outside intake gap with the fuel tank. All or most of the outside air intake is hidden behind the fuel tank. As a result, it is possible to reduce the direct entry and adhesion of scattered objects from the ground side to the outside air intake port of the precleaner.
For this reason, in addition to improving the cleaning of the air introduced into the engine by providing a precleaner on the upper side of the intake path of the air cleaner, flying objects such as scattered mud and dust from the ground side directly Since the deterioration of the purification performance due to being introduced into the intake port can be suppressed, there is an advantage that the purification function can be maintained over a long period of time. In addition, the means for this is simply the arrangement of the pre-cleaner and the fuel tank and the setting of the orientation of the pre-cleaner intake port. No additional structure is required and the number of parts is not increased. This can be achieved with a simple structure.

In addition, since the outside air intake port of the pre-cleaner faces downward, it is easy to avoid the entry of water at the time of car washing, and it is possible to generate a small amount of air flow around the opposing fuel tank. A secondary effect of suppressing the increase in the temperature in the tank and reducing the degree of fuel evaporation can also be expected.

[Solution 2]
According to a second solution of the working vehicle of the present invention, as described in claim 2, a canister to which vaporized fuel in the fuel tank is supplied is provided near the fuel tank, and a path for taking outside air into the canister is provided. It is connected in the middle of the intake path from the pre-cleaner to the air cleaner. .

[Action and effect]
The work vehicle of the present invention according to the solving means 2 configured as described above exhibits the following actions and effects in addition to the actions and effects equivalent to those of the invention according to the solving means 1.
In other words, the canister is disposed in the vicinity of the fuel tank because of the function of adsorbing the evaporated fuel in the fuel tank, but the introduction of the outside air into the canister is directly introduced from the outside air inlet as in the prior art. Instead, the outside air introduction path is formed so as to introduce outside air that has passed through the precleaner.
For this reason, when the vaporized fuel is sucked out from the canister by using the suction negative pressure of the air cleaner, the introduction of the outside air from the precleaner side to the canister can be purified and supplied.
As a result, the adsorption performance of the vaporized fuel by the canister can be easily maintained in a good state over a long period. In addition, since the precleaner is extended to the vicinity of the canister, there is also an advantage that the connecting pipe between the canister and the precleaner can be shortened.

Hereinafter, an example of an embodiment of the present invention will be described based on the drawings.
[Overall configuration of work vehicle]
As shown in FIGS. 1 and 3, a front wheel 1 composed of a pair of left and right steerable tire wheels and a rear wheel 2 composed of a pair of left and right tire wheels are distributed before and after a body frame 3. Between the front and rear wheels 1 and 2, a driving unit 4 that drives the front and rear wheels 1 and 2, and a driving unit 7 that includes a driving seat 5 and a steering operation unit 6 are provided. At the rear part of the vehicle body frame 3, a loading platform 8 is provided so as to be swingable up and down around a vehicle body lateral axis x1 located at the rear of the loading platform.
The driving unit 4 is disposed at the lower rear portion of the driving unit 7, and the water-cooled engine 40 and the transmission case 41 are arranged in the left and right directions, and the longitudinal length is shortened compared to the case where they are arranged in the front and rear. Thus, the output from the transmission case 41 is transmitted to the rear wheel 2 and the front wheel 1.

[Body frame structure]
The vehicle body frame 3 is configured as shown in FIGS.
That is, a vehicle body main frame 31 mainly composed of a pair of left and right square steel pipes, a front main frame 32 made of a molded metal plate, and the vehicle body main frame 31 and the front main frame 32 It is comprised with the combination with the intermediate part frame 33 which consists of a round steel pipe provided in between.

The vehicle body main frame 31 connects a pair of left and right long front and rear frames 31a, a rear connection frame 31b connecting the rear ends of the long front and rear frames 31a, and an intermediate portion of the long front and rear frames 31a. And a middle connecting frame 31c.
The pair of left and right long front and rear frames 31a and 31a have a bent portion in the vertical direction so as to form a stepped portion at the middle portion in the front and rear direction, and on the front end side, the left and right long frames 31a and 31a It has a bent portion bent in the left-right direction so that the distance between the long front and rear frames 31a, 31a is narrowed.
A seat support frame 31d bent in an L-shape is integrally joined to the step portion at the intermediate portion so as to extend over a portion of the left and right long front and rear frames 31a, 31a at a high position and a portion at a low position. It is configured so as to double the strength of the stepped portion and support means for the driver seat 5.
Further, of the step portions in the middle part of the pair of left and right long front and rear frames 31a, 31a, the lower part corresponding to the middle part of the middle part frame 33 is connected to and fixed to the lower part. A frame 31e extends sideways. Further, the front end portions of the pair of left and right long front and rear frames 31a, 31a are connected and fixed to the intermediate frame 33 as will be described later.

The front-side main frame 32 includes a flat floor frame 32a that is fixed in a mounted state over the left and right long front and rear frames 31a, 31a of the vehicle body main frame 31, and a front oblique upper side following the floor frame 32a. The vertical wall-shaped frame 32b that rises in the front-rear direction and extends in the front-rear direction, and the horizontal frame 32c that is connected to the lower end side at the front end side of the vertical wall-shaped frame.
The front main frame 32 has a suspension support frame 32d for supporting the suspension mechanism 10 of the front wheel 1 in cooperation with an intermediate frame 33 described later, and an upper end portion of the vertical wall frame 32b. And the frame material of the intermediate frame 33 are fixed.

The intermediate frame 33 includes a pair of left and right lateral side frames 33a and 33a bent along the floor side, the front side, the rear side, and the ceiling side of the driving unit space, and the left and right lateral side frame 33a, A plurality of straight rod-like connecting frames 33b that linearly connect 33a to each other, and a front protruding frame 33c that is bent in a V shape so as to protrude further forward in front of the lateral side frames 33a and 33a. I have.
The pair of left and right lateral side frames 33 a and 33 a are arranged on the floor side of the operation unit 7, the lateral outer ends of the laterally stretched frames 31 e of the pair of left and right long front and rear frames 31 a and 31 a, and the front side main frame 32. And is fixed to the left and right long front and rear frames 31a and 31a of the vehicle body main frame 31 via the arm rod 33d on the rear side of the driving unit 7.
In addition, the intermediate frame 33 is disposed on the front side of the operation unit 7 via a vertical frame 33e which is welded and fixed to the front ends of the long front and rear frames 31a and 31a below the straight connecting frame 33b positioned on the front side. The front projecting frame 33c is also connected and fixed to the front end side of the front main frame 32 via another vertical frame 33f on the front side.

A handrail 34 that can be used by an occupant as an armrest is connected to the left and right lateral side frames 33a and 33a at a position corresponding to the rear side of the driving unit 7 in the intermediate frame 33. .
The pair of left and right lateral side frames 33a and 33a in the intermediate frame 33 is also configured to function as a pair of left and right fall protection frames 71 and 72.
Further, the pair of left and right lateral side frames 33a and 33a in the intermediate frame 33 can be divided vertically by a connecting portion 74 at an intermediate position in the vertical direction.

[Configuration of operation section]
In the driving unit 7, the driving unit floor 70 is configured on the floor frame 32a of the front main frame 32, the steering operation unit 6 including the steering wheel 60 is disposed on the front side thereof, and the driving seat is provided on the rear side. 5 is disposed.

  The driver seat 5 has a seat mounting base 50 fixed to the seat support frame 31d of the vehicle body main frame 31 and both lateral side frames 33a of the intermediate frame 33, and an upward mounting surface of the seat mounting base 50. The seating seat 51 is mounted so as to swing up and down around the horizontal axis x2 on the front end side, and the backrest seat 52 is fixed to the rear rising portion of the seating table 50.

As shown in FIGS. 1, 3, and 4, in the lower space of the seat placement table 50 of the driver seat 5, the radiator 42 is in a position near the right lateral side in a state where the radiator 42 is in the lower space of the seat placement table 50. The fuel tank 46 is disposed near the left lateral portion of the lower space of the seat mounting table 50.
A predetermined air guide path r for sucking outside air is formed between the air intake surface 42a of the radiator main body 43 incorporating the heat exchanging part in the radiator 42 and the right lateral surface 50a of the seat mounting table 50. A gap s is formed. Thereby, with respect to the intake surface 42a of the radiator 42, from the lower side of the seat support base 50 and the rear side in accordance with the suction action of the radiator fan 42b disposed on the back side (the inward side of the body) of the radiator 42. The outside air can be introduced from the outside.
The right lateral side surface 50a of the seat mounting table 50 constitutes a vehicle body outer plate as an exterior member of the vehicle body, and the air intake guide path r is formed using the vehicle body outer plate.

  As shown in FIGS. 1 and 3, an extended shielding plate 53 is extended on the rear side of the seat mounting table 50. The extended shielding plate 53 extends to the rear side of the machine body so as to be connected to the rear edge of the seating table 50, and the radiator 42 that cannot be covered by the right lateral surface 50 a of the seating table 50. The air intake surface 42a is opposed so as to cover the range facing the rear lower side from the lateral side, and is further extended to the rear.

[Composition of the motor section]
The prime mover 4 is juxtaposed on the left and right with the water-cooled engine 40 positioned on the left and the transmission case 41 positioned on the right. The water-cooled engine 40 and the transmission case 41 are disposed on the rear side of the machine body within the left-right distance between the fuel tank 46 and the radiator 42 in plan view.
That is, as shown in FIG. 3, the engine 40 and the transmission case 41 are arranged in a state shifted in plan view in the front-rear direction and the left-right direction with respect to the fuel tank 46 and the radiator 42. It is devised to shorten the overall longitudinal dimension.

The water-cooled engine 40 and the radiator 42 include a return-side circulation pipe 45 a that takes out the cooling water after heat exchange from the engine cooling water jacket (not shown) to the upper end side of the radiator 42, and a cooling jacket from the lower end end side of the radiator 42. A cooling water circulation pipe 45 comprising a supply side circulation pipe 45b for supplying cooling water to the pipe is connected.
And the radiator 42 of the present invention is configured such that the water supply port 44 portion is separate from the radiator main body 43 containing the heat exchanging portion, and the water supply port 44 portion is shown in FIGS. As shown in FIG. 5, the driver seat 5 is provided at a location away from the seating seat 51.

  That is, the water supply port 44 is located in the middle of the cooling water circulation pipe 45 provided at a position higher than the upper end of the radiator main body 43 and the cooling jacket of the engine 40, and so as to facilitate water supply work from the lateral outer side of the airframe. It is provided at a position relatively close to the lateral outer side, for example, at a position near the long front and rear frame 31 a of the vehicle body main frame 31.

  Further, the place where the water supply port 44 is disposed is located below the cargo bed 8 so that the water supply port 44 cannot be opened / closed from the outside when the cargo bed 8 is lowered as in a normal traveling state. A side space or a space between the loading platform 8 and the driver's seat 5. Accordingly, the arrangement position is set so that the space around the water supply port 44 is opened and the operation from the outside is possible by raising the loading platform 8 around the horizontal axis x1. In this embodiment, the position where the water supply port 44 is provided is the highest position of the cooling water circulation pipe 45.

  Reference numeral 48 in FIG. 3 denotes a muffler disposed rearward of the fuselage, and a spark arrester 93 that removes sparks in the exhaust is mounted at the exhaust tube end portion of the muffler 48.

[Configuration of fuel supply system]
6 shows a fuel tank 46, a canister 47 containing an adsorbent such as carbon for adsorbing evaporated fuel from the fuel tank 46, an air cleaner 90 for supplying combustion air to the engine 3, and the air cleaner 90 The arrangement | positioning relationship with the pre-cleaner 91 located in the upper side of the intake path is shown.
These are not deployed in a state of being installed in the hood, but are deployed on the lower side of the loading platform 8 on the rear side of the operation unit 7 as shown in FIGS. 1 and 2. That is, it is an arrangement configuration of the prime mover 4 in a work vehicle that does not include a bonnet that accommodates the prime mover, and is in a state where most of the lower side, the lateral side, and the rear side face the open space. Therefore, it is in an environment where dust from the outside and a large amount of scattered mud are dancing compared to the bonnet interior type driving part.

In the work vehicle used under such conditions, in the present invention, the fuel tank 46 is in a state where it sinks into the lower space of the seat mounting table 50 of the driver's seat 5 as shown in FIGS. The air cleaner 90 is disposed on the rear side of the engine 40 disposed on the rear side of the driver's seat 5 and below the loading platform 8.
A precleaner 91 is disposed on the front end side of an intake pipe 90a that constitutes an intake path for introducing outside air into the air cleaner 90, and the precleaner 91 is disposed to face the upper surface side of the fuel tank 46.

As shown in FIGS. 3 and 5 to 7, the outside air intake 91 a of the precleaner 91 is disposed downward so as to face the upper surface of the fuel tank 46.
That is, in plan view, as shown in FIG. 3, the entire outside air intake port 91a of the precleaner 91 is disposed so as to face the upper surface near the rear end of the fuel tank 46, and the rear surface. In view, the outside air intake port 91 a is disposed downward facing the upper surface of the fuel tank 46, and an outside air intake gap d is formed between the outside air intake port 91 a and the upper surface of the fuel tank 46.

A canister 47 containing an adsorbent such as activated carbon is attached to a location corresponding to the front side of the precleaner 91 on the upper surface side of the fuel tank 46 so as to collect the fuel vaporized in the fuel tank 46. ing.
The canister 47 is connected to a fuel supply port 46 a of the fuel tank 46 by a vapor introduction pipe 47 a, and a vapor discharge pipe 47 b is connected to a combustion gas supply path 90 b from the air cleaner 90 to the engine 40. The outside air introduction path for introducing outside air to the canister 47 is constituted by the outside air introduction pipe 47 c connected in the middle of the canister 47 and the intake path from the precleaner 91 to the air cleaner 90.

  A vapor introduction pipe 47a connected to the fuel supply port 46a of the fuel tank 46 is provided with a 2-way valve 92 in the middle of the pipeline. The two-way valve 92 is for switching the gas flow direction in the vapor inlet pipe 47a to a state in which only one of the fuel tank 46 side and the canister 47 side or the opposite direction is allowed to flow. Based on the detection result of a sensor (not shown) that detects whether or not the engine 40 is in operation, the outside air is allowed to flow from the canister 47 side to the fuel tank 46 side when in operation, and is not in operation. If so, the controller 40 is configured to be switched by a control device that performs various controls of the engine 40 so as to allow inflow of vaporized fuel from the fuel tank 46 side to the canister 47 side.

8 and 9 are block diagrams for explaining the flow of outside air and vaporized fuel in the fuel supply system. In the figure, solid arrows indicate the flow of fuel (liquid), and dotted arrows indicate the flow of vaporized fuel. Open arrows indicate the flow of outside air.
<Engine running>
As shown in FIG. 8, the fuel in the fuel tank 46 is supplied to the engine 40 via the fuel pipe 46b.
Then, along with the operation of the air cleaner 90, outside air is supplied to the engine 40 through the precleaner 91 and the air cleaner 90. At this time, the negative pressure generated by the combustion gas supplied from the air cleaner 90 to the engine 40 acts on the canister 47 via the vapor discharge pipe 47b. As a result, the vaporized fuel substance (hydrocarbon etc.) collected in the canister 47 is sucked into the engine 40 through the vapor discharge pipe 47b, and at the same time, the outside air is introduced from the precleaner 91 through the outside air introduction pipe 47c. Is done.
At this time, the two-way valve 92 interposed in the middle of the vapor introducing pipe 47a connecting the canister 47 and the fuel tank 46 is switched to a state allowing the flow from the canister 47 side to the fuel tank 46 side. Therefore, if the liquid level decreases as the fuel in the fuel tank 46 is consumed, the outside air flows from the canister 47 side to the fuel tank 46 side.

<Engine non-operation>
As shown in FIG. 9, when the engine 40 is stopped, the operation of the fuel injection device (not shown) is stopped. Therefore, the air cleaner 90 is also stopped, and the intake of outside air is not performed.
At this time, since the two-way valve 92 interposed in the middle of the vapor introduction pipe 47a is switched to a state allowing the flow from the fuel tank 46 side to the canister 47 side, the vaporized vaporized while the engine 40 is stopped. The fuel is guided to the canister 47 and collected by the adsorbent.

[Other Embodiment 1]
[1] In the above-described embodiment, an example in which the radiator 42 is disposed on the right side of the traveling aircraft body and the fuel tank 46 is disposed on the left lateral side is shown, but the present invention is not limited thereto, and the radiator 42 is disposed on the traveling aircraft body. The fuel tank 46 may be disposed on the left lateral side and the fuel tank 46 may be disposed on the right lateral side.

[Other Embodiment 2]
[2] The intake gap s formed between the vehicle body outer plate provided on the lateral side portion of the seat mounting table 50 of the driver seat 5 is downward or rearward between the radiator 42 and the vehicle body outer plate. It may be opened only in either one of them, or may be opened in both.

[Other Embodiment 3]
[3] The pre-cleaner 91 arranged to face the upper surface of the fuel tank 46 is in a state where the entire outside air intake port 91a is located on the upper surface of the fuel tank 46 in plan view. However, the outside air intake port 91a may be in a state where the majority of the outside air intake port 91a is located on the upper surface of the fuel tank 46. In this case, it is inferior to the case where the entirety faces the upper surface of the fuel tank 46, but a certain degree of effect can be expected. Therefore, in the present invention, the whole is located on the upper surface of the fuel tank 46, and the one where most is located is referred to as “substantially the whole”.

Side view of the entire work vehicle Perspective view of the entire body frame Plan view showing the positional relationship between the driver's seat and the driving section Sectional view showing the intake structure to the radiator Rear view of prime mover Perspective view showing the fuel supply system Cross section of precleaner part Block diagram showing the flow of the fuel supply system Block diagram showing the flow of the fuel supply system

Explanation of symbols

3 Car body frame 5 Driver's seat 6 Steering operation section 7 Driving section 46 Fuel tank 47 Canister 47c Outside air introduction path (outside air introduction pipe)
50 Seat mounting table 90 Air cleaner 91 Pre-filter 91a Outside air intake d Outside air intake gap

Claims (2)

  A pre-cleaner is provided on the upper side of the air cleaner intake path, and the external air intake port of the pre-cleaner is opposed to the upper surface side of the fuel tank in a downward posture, and an external air intake gap is separated from the upper surface of the fuel tank. Work vehicle installed.   2. The work vehicle according to claim 1, wherein a canister for supplying vaporized fuel in the fuel tank is provided near the fuel tank, and an outside air introduction path to the canister is connected in the middle of an intake path from the precleaner to the air cleaner.

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