EP3591211B1 - Nutzfahrzeug - Google Patents

Nutzfahrzeug Download PDF

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Publication number
EP3591211B1
EP3591211B1 EP19175231.0A EP19175231A EP3591211B1 EP 3591211 B1 EP3591211 B1 EP 3591211B1 EP 19175231 A EP19175231 A EP 19175231A EP 3591211 B1 EP3591211 B1 EP 3591211B1
Authority
EP
European Patent Office
Prior art keywords
engine
air cleaner
pipe
air
coupled
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP19175231.0A
Other languages
English (en)
French (fr)
Other versions
EP3591211A2 (de
EP3591211A3 (de
Inventor
Takashi KUMASHIRO
Hiroki Nagai
Tomohisa Yamamoto
Toshiki Kanai
Takeshi Komorida
Akihito Mihara
Tatsuro TOKUNAGA
Kazutomo Miyaguchi
Taisuke Hashimoto
Ryo Matsumoto
Yuto FUJII
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kubota Corp
Original Assignee
Kubota Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2018114664A external-priority patent/JP7072449B2/ja
Priority claimed from JP2018144358A external-priority patent/JP7117929B2/ja
Application filed by Kubota Corp filed Critical Kubota Corp
Publication of EP3591211A2 publication Critical patent/EP3591211A2/de
Publication of EP3591211A3 publication Critical patent/EP3591211A3/de
Application granted granted Critical
Publication of EP3591211B1 publication Critical patent/EP3591211B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/10006—Air intakes; Induction systems characterised by the position of elements of the air intake system in direction of the air intake flow, i.e. between ambient air inlet and supply to the combustion chamber
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/10006—Air intakes; Induction systems characterised by the position of elements of the air intake system in direction of the air intake flow, i.e. between ambient air inlet and supply to the combustion chamber
    • F02M35/10019—Means upstream of the fuel injection system, carburettor or plenum chamber
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/10091—Air intakes; Induction systems characterised by details of intake ducts: shapes; connections; arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/16—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines characterised by use in vehicles
    • F02M35/161—Arrangement of the air intake system in the engine compartment, e.g. with respect to the bonnet or the vehicle front face
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/16—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines characterised by use in vehicles
    • F02M35/164—Heavy duty vehicles, e.g. trucks, trains, agricultural or construction machines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/10006—Air intakes; Induction systems characterised by the position of elements of the air intake system in direction of the air intake flow, i.e. between ambient air inlet and supply to the combustion chamber
    • F02M35/10013—Means upstream of the air filter; Connection to the ambient air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/12—Intake silencers ; Sound modulation, transmission or amplification
    • F02M35/1205—Flow throttling or guiding
    • F02M35/1233—Flow throttling or guiding by using expansion chambers in the air intake flow path

Definitions

  • the present invention relates to work vehicles, and specifically relates to riding work vehicles such as tractors.
  • JP 2015-163512A discloses a work vehicle provided with an air cleaner that cleans air supplied to an engine.
  • This work vehicle is provided with a hood located forward of a driver section, and an engine is provided inside the hood.
  • An air cleaner that takes in external air, removes dust or the like from the external air that has been taken in, and supplies clean air to the engine is provided inside the hood.
  • This air cleaner extends in a front-rear direction of the machine body of the work vehicle, and clean air from the air cleaner is supplied to the engine via a turbocharger, which is a pipe extending in the front-rear direction of the machine body.
  • a turbocharger which is a pipe extending in the front-rear direction of the machine body.
  • the turbocharger is a pipe extending in the front-rear direction of the machine body, and is attached to an upper end portion of the engine. Therefore, clean air from the air cleaner is supplied to the engine via a pipe that is bent toward the upper end portion of the engine at the rear end in the front-rear direction of the machine body.
  • the engine takes in air from a portion where the engine is connected to the pipe, and noise generated in the portion where the engine takes in air reaches the driver section located rearward of the engine.
  • An object of the invention is to provide a work vehicle that can reduce noise that reaches the driver section.
  • WO 03/054373 and JP2011-021571A disclose each a similar vehicle with a coupling tube coupled between the engine and the air cleaner and extending in a right-left direction.
  • a work vehicle as below is proposed in correspondence with First Related Art:
  • a work vehicle comprising:
  • the coupling tube between the air cleaner and the engine is coupled to the engine, while extending in the right-left direction of the travel vehicle body and being coupled to the air cleaner.
  • the coupling tube includes a section that extends in the right-left direction of the travel vehicle body, and therefore processed air flowing through the coupling tube also flows in the right-left direction and is brought to the engine. Therefore, at least some of the noise generated in an intake portion where the engine is coupled to the coupling tube and from which processed air is taken into the engine does not travel rearward of the travel vehicle body, but instead travels in the right-left direction of the travel vehicle body along with the processed air flowing in the right-left direction. As a result, it is possible to reduce noise generated in the intake portion and travelling toward the driver section provided rearward of the air cleaner and the engine.
  • the longitudinal direction of the air cleaner is parallel with the right-left direction of the travel vehicle body, a larger amount of external air taken in by the air cleaner flows in the right-left direction than in the front-rear direction. Therefore, it is possible to further reduce noise generated in the intake portion and travelling toward the driver section provided rearward of the air cleaner and the engine.
  • the coupling tube extends from the engine in the right-left direction of the travel vehicle body, thereafter curves toward the exhaust portion, and is coupled to the exhaust portion.
  • the exhaust portion is provided on a side of the air cleaner. Therefore, while a configuration in which the coupling tube coupled to the engine extends in the right-left direction is employed, the coupling tube can be easily connected to the air cleaner.
  • the intake tube extends from a portion where the intake tube is coupled to the air cleaner, thereafter extends to a position forward of the air cleaner, and curves and extends to a position that is rearward with respect to the travel vehicle body.
  • the intake tube does not extend rearward directly from the air cleaner, but instead first extends to a position that is forward of the air cleaner, and thereafter curves and extends rearward. Therefore, the flow in the front-rear direction of air taken in from an open end of the intake tube is weakened in the curved portion. As a result, it is possible to further reduce noise travelling toward the driver section.
  • the work vehicle further includes a radiator that is provided rearward of the engine and cools cooling water for cooling the engine; and a cooling fan that is provided immediately forward of the radiator, and an end portion, from which external air is taken in, of the intake tube is located rearward of the radiator.
  • the rear end portion of the intake tube is located rearward of the radiator. Therefore, it is possible to realize a configuration in which cooling air that has not been supplied to the radiator is taken into the air cleaner via the intake tube. As a result, it is unlikely that incomplete combustion occurs in the engine due to the lack of air.
  • a tractor is an example of the work vehicle.
  • front refers to the direction in which the tractor travels forward during working travel (see arrows F in Figs. 1 and 2 )
  • rear refers to the direction in which the tractor travels rearward (see arrows B in Figs. 1 and 2 )
  • right refers to the direction corresponding to the right side relative to the forward orientation of the tractor in the front-rear direction (see an arrow R in Fig. 2 )
  • left refers to the direction corresponding to the left side (see an arrow L in Fig. 2 ).
  • Up refers to the direction corresponding to the upper side (see an arrow T in Fig. 1 )
  • down refers to the direction corresponding to the lower side (see an arrow D in Fig. 1 ).
  • the tractor in the present embodiment which is an example of a work vehicle, is configured as described below.
  • the tractor is constituted by a travel vehicle body 100 that includes a vehicle body frame 1, which forms a framework of a vehicle body, a prime mover section 2, which is supported on the front side of the vehicle body frame 1, a riding-type driver section 4, which is located on the rear side of the vehicle body frame 1, right and left traveling apparatuses 5, a protection frame 6, which is coupled to a rear end portion of the vehicle body frame 1, etc.
  • a travel vehicle body 100 that includes a vehicle body frame 1, which forms a framework of a vehicle body, a prime mover section 2, which is supported on the front side of the vehicle body frame 1, a riding-type driver section 4, which is located on the rear side of the vehicle body frame 1, right and left traveling apparatuses 5, a protection frame 6, which is coupled to a rear end portion of the vehicle body frame 1, etc.
  • the right and left travel apparatuses 5 are of a four-wheel drive type, including right and left front wheels 5A, which are steerable and are driven by power from the prime mover section 2, and right and left rear wheels 5B, which are driven by power from the prime mover section 2.
  • the vehicle body frame 1 includes a pair of right and left side members 10 that are made of steel plates and extend in the front-rear direction, and a front member 11 that is made of a steel plate and spans between the front ends of the right and left side members 10.
  • a center pillar 12 spans between the right and left side members 10 at a substantially central position in the front-rear direction of the right and left side members 10.
  • a transmission 13 is attached to a position near rear end portions of the right and left side members 10 for transmitting power from an engine 21 provided in the prime mover section 2 to the right and left traveling apparatuses 5 and so on, while performing speed conversion.
  • An HST (Hydrostatic Transmission) 50 is provided in the transmission 13 as an example of a continuously variable transmission mechanism, correspondingly to the right and left front wheels 5A and the right and left rear wheels 5B in the right and left travel apparatuses 5.
  • a driver section step 15 described below is provided with an HST operation pedal 51. Upon the HST operation pedal 51 being operated, the operation performed on the HST operation pedal 51 is transmitted to the HST 50 via an HST linkage mechanism (not shown), and the HST 50 is subjected to continuously variable speed conversion.
  • a driver seat 42 is located above the transmission 13; the driver section step 15 on which the driver can ride is provided within the gap between the driver seat 42 and the prime mover section 2 in the front-rear direction; and rear wheel fenders 16 are provided on the right and left sides of the driver seat 42.
  • a dashboard 40 is provided at a position located rearward of the hood 20 of the prime mover section 2.
  • the dashboard 40 is provided with a steering wheel 41 for steering the front wheels, and indicators that indicate the engine speed and so on, and functions as a member that constitutes a part of the driver section 4.
  • a throttle lever 27 that is used to operate a throttle of the engine is provided at a position on the lateral side of the body of the engine 21.
  • the throttle lever 27 is supported so as to be pivotable in a horizontal direction about a vertical axis y1 as shown in Fig. 4 , and an accelerator wire 28 is coupled to the leading end of the throttle lever 27.
  • the accelerator wire 28 is pushed and pulled in response to an operation performed using an accelerator operation tool 29 that is provided in the driver section 4, and accordingly the rotation angle of the throttle lever 27 is changed and the speed of the rotation engine 21 is adjusted.
  • a partition 3 described below is provided between the driver section step 15 and a lower portion of the above-described dashboard 40.
  • the dashboard 40 while being used as a constituent element of the driver section 4 equipped with indicators or the like, the dashboard 40 also functions as an upper lid of the partition 3, and as a member of the prime mover section 2 constituting a part of an engine room 2A of the prime mover section 2 together with the partition 3.
  • the partition 3 is a combination of a main frame 30 that is grid-shaped, and an external wall plate 31 having a large number of ventilation holes and provided on the rear surface of the main frame 30.
  • the partition 3 is provided at a position below the dashboard 40 and above the driver section step 15. An intermediate portion of the partition 3 in the right-left direction bulges rearward, and the partition 3 is substantially gate-shaped in plan view.
  • a battery 26 is housed in space on the inner peripheral side of the partition 3 that is gate-shaped in plan view.
  • the prime mover section 2 has a configuration described below.
  • the engine 21, which is a water-cooled type gasoline engine supported on a front portion of the vehicle body frame 1 so as to be vibration-proof, is provided in the engine room 2A. Furthermore, a cooling fan 22 that is located rearward of the engine 21, a radiator 23 that is located rearward of the cooling fan 22, an air cleaner 24 that is located above the engine 21, a muffler 25 that is located forward of the engine 21, and so on are provided in the engine room 2A.
  • the hood 20 is of an integrated type in which a front cover 20a that covers a front end portion of the prime mover section 2 and allows air to pass, right and left side covers 20b that cover lateral side portions of the prime mover section 2, an upper cover 20c that covers an upper portion of the prime mover section 2, head light units 20d, and so on are coupled to each other and integrated into one piece.
  • This hood 20 is configured to be able to swing to open and close in the up-down direction about a pivot axis x1 located at a front end portion of the vehicle body frame 1 and extending in the right-left direction.
  • the hood 20 is configured to be able to swing in a up-down direction between a closed position where the hood 20 covers the prime mover section 2 and an open position where the hood 20 does not cover the prime mover section 2, and is configured to be of a rear-open type, i.e. a rear portion of the space inside the hood 20 is wide open when the hood 20 is in the open position.
  • a rear-open type i.e. a rear portion of the space inside the hood 20 is wide open when the hood 20 is in the open position.
  • the radiator 23 is provided in a rear end portion of the engine room 2A, and the cooling fan 22 for taking in external air and bringing the external air into contact with the radiator 23 is provided in the engine room 2A at a position that is forward of the radiator 23.
  • External air that is to be supplied to the radiator 23 passes through the partition 3 on the rear side, and is taken in and brought to the radiator 23 as indicated by the arrow in Fig. 4 , cools the radiator 23, the engine 21 and the muffler 25, and is thereafter discharged from a portion of the front cover 20a on the front side.
  • the air cleaner 24 is provided inside the hood 20 at a position above the engine 21 and forward of the radiator 23.
  • An intake tube 61 that is used to take in external air is coupled to the air cleaner 24.
  • a coupling tube 63 is coupled between the engine 21 and the air cleaner 24.
  • the air cleaner 24 takes in external air via the intake tube 61, performs dust removal processing to remove dust such as cut grass and sand, and supplies the processed air to the engine 21 via the coupling tube 63.
  • the air cleaner 24 has an elongated cylindrical shape and its longitudinal direction extends parallel with the right-left direction of the travel vehicle body 100.
  • the air cleaner 24 includes a cylindrical side portion 24b that extends in the right-left direction, and a left side portion 24c and a right side portion 24d that are respectively located at the ends of the cylindrical side portion 24b in the right-left direction.
  • An air intake port 24a from which external air is taken in is provided near the left side portion 24c of the air cleaner 24.
  • the air intake port 24a is open rearward and obliquely downward at a position that is rearward of the engine 21 with respect to the machine body, and is forward of the radiator 23. External air passing through the partition 3 and the radiator 23 is taken in from the air intake port 24a to the inside of the air cleaner 24.
  • a protrusion 24e is provided on the cylindrical side portion 24b of the air cleaner 24 so as to protrude forward and obliquely upward from the cylindrical side portion 24b. Also, an exhaust portion 24f is provided in the right side portion 24d of the air cleaner 24 such that the processed air subjected to dust removal processing performed by the air cleaner 24 may be discharged from the air cleaner 24.
  • the intake tube 61 for taking in external air to the air cleaner 24, and the coupling tube 63 extending from the air cleaner 24 and coupled to the engine 21, are connected to the air cleaner 24.
  • the intake tube 61 is connected to the protrusion 24e of the air cleaner 24. Therefore, the intake tube 61 extends along the protrusion 24e to a position that is forward of the air cleaner, and thereafter extends to a position that is rearward of the travel vehicle body 100.
  • the intake tube 61 includes an intake open end portion 61a that is open at the rear end, an intake elongated portion 61b that extends from the intake open end portion 61a in the front-rear direction, an intake curved portion 61c that extends forward from the protrusion 24e and curves rearward toward the left, and an intake connection end portion 61d that is connected to the protrusion 24e.
  • the intake open end portion 61a (the rear end portion of the intake tube 61) is located near the front side of the radiator 23 with a gap therefrom, for example. External air is taken in from the intake open end portion 61a, and is brought to the air cleaner 24 via the intake elongated portion 61b, the intake curved portion 61c and the intake connection end portion 61d.
  • the coupling tube 63 is coupled to the exhaust portion 24f provided on the right side portion 24d of the air cleaner 24, and sends out processed air in the air cleaner 24 to the engine 21.
  • the coupling tube 63 is coupled to the engine 21, and also extends in the right-left direction of the travel vehicle body 100, thereafter curves toward the exhaust portion 24f, and is coupled to the exhaust portion 24f.
  • the coupling tube 63 includes a third pipe 63c that is coupled to an upper opening of the engine 21, a second pipe 63b that curves upward and to the right from the third pipe 63c and extends in the right-left direction, and a first pipe 63a that curves toward the exhaust portion 24f from the second pipe 63b and extends toward the air cleaner 24.
  • the first pipe 63a extends forward and to the right from the exhaust portion 24f, thereafter curves forward and to the left, and is coupled to the second pipe 63b.
  • the second pipe 63b extends in the right-left direction from the first pipe 63a, and is coupled to the third pipe 63c.
  • the second pipe 63b extends downward from a left portion of the portion extending in the right-left direction such that the second pipe 63b can be coupled to the third pipe 63c.
  • the third pipe 63c is coupled to the upper opening of the engine 21, and extends in the up-down direction.
  • the third pipe 63c may curve toward the second pipe 63b so as to be coupled to the second pipe 63b.
  • the coupling tube 63 between the air cleaner 24 and the engine 21 is coupled to the engine 21, while extending in the right-left direction of the travel vehicle body 100 and being coupled to the air cleaner 24.
  • the coupling tube 63 includes the second pipe 63b that extends in the right-left direction of the travel vehicle body 100, and therefore processed air flowing through the coupling tube 63 also flows in the right-left direction and is brought to the engine 21. Therefore, at least some of the noise generated in an intake portion where the engine 21 is coupled to the coupling tube 63 and from which processed air is taken into the engine 21 does not travel rearward of the travel vehicle body 100, but instead travels in the right-left direction of the travel vehicle body 100 along with the processed air flowing in the right-left direction. As a result, it is possible to reduce noise generated in the intake portion and travelling toward the driver section 4 provided rearward of the air cleaner 24 and the engine 21.
  • the coupling tube 63 between the air cleaner 24 and the engine 21 does not extend in the right-left direction, but instead extends rearward with respect to the travel vehicle body 100 and is coupled to the air cleaner 24, processed air that is brought from the air cleaner 24 to the engine 21 via the coupling tube 63 travels in the front-rear direction of the travel vehicle body 100. Therefore, noise generated in the intake portion where the engine 21 and the coupling tube 63 are coupled to each other travels rearward along with processed air flowing in the front-rear direction. For example, when the tractor travels forward, processed air flows rearward inside the hood 20, and noise travels further rearward toward the driver section 4. With the above-described configuration, however, it is possible to reduce noise travelling toward the driver section 4.
  • the longitudinal direction of the air cleaner 24 extends parallel with the right-left direction of the travel vehicle body 100, and therefore, external air taken in by the air cleaner 24 mainly flows in the right-left direction compared to the front-rear direction. Therefore, it is possible to further reduce noise generated in the aforementioned intake portion and travelling toward the driver section 4 provided rearward of the air cleaner 24 and the engine 21.
  • the exhaust portion 24f is provided in the right side portion 24d of the air cleaner 24. Therefore, while the coupling tube 63 coupled to the engine 21 extends in the right-left direction, the coupling tube 63 can be easily connected to the air cleaner 24.
  • the intake tube 61 includes the intake curved portion 61c that does not extend rearward directly from the air cleaner 24, but instead first extends to a position that is forward of the air cleaner 24 and thereafter curves and extends rearward. Therefore, the flow of air taken in from the intake open end portion 61a of the intake tube 61 is weakened in the curved portion. As a result, it is possible to further reduce noise travelling toward the driver section 4.
  • the air cleaner 24 is provided with the air intake port 24a and the intake tube 61, external air can be taken in from a plurality of positions. Therefore, it is possible to ensure that a sufficient amount of air is supplied to the engine 21. As a result, it is unlikely that incomplete combustion occurs in the engine 21 due to the lack of air.
  • the protection frame 6 that is gate-shaped and is coupled to the rear end portion of the vehicle body frame 1 is provided in a rear portion of the driver seat 42.
  • This gate-shaped protection frame 6 includes right and left supporting posts 6a and a coupling member 6b.
  • the right and left supporting posts 6a are located rearward of the driver seat 42 on the right and left sides respectively.
  • the right and left supporting posts 6a extend in the up-down direction, and extend toward the center in the right-left direction from the upper end portions so as to oppose each other.
  • the upper end portions, which oppose each other, of the right and left supporting posts 6a are not continuous.
  • the upper end portions, which oppose each other, of the right and left supporting posts 6a are coupled to each other by the coupling member 6b.
  • a center-side end of the upper end portion of the left supporting post 6a and an end portion of the coupling member 6b are fixed by fastening members 6b1
  • a center-side end of the upper end portion of the right supporting post 6a and an end portion of the coupling member 6b are fixed by fastening members 6b 1.
  • the protection frame 6 can be assembled by fitting the right and left supporting posts 6a to the travel vehicle body 100, and thereafter fixing them using the coupling members 6b. Therefore, the protection frame 6 can be easily assembled.
  • the right and left supporting posts 6a curve at lower portions where are attached to the travel vehicle body 100, and also curve at upper portions. Therefore, only the right and left supporting posts 6a include curved portions. Also, the right and left supporting posts 6a have the same shape, and they can be manufactured more easily than when right and left members that are different from each other are manufactured.
  • An HST linkage mechanism 120 shown in Figs. 7 and 8 is a mechanism for transmitting an operation performed on the HST operation pedal 51 to the HST 50.
  • the HST linkage stay 90 swings about a shaft 95 in response to the operation, the inclined plate (not shown) of the HST 50 is controlled by the swing, and an output from the HST 50 is controlled.
  • the HST linkage stay 90 is made of a single plate, and has a polygonal shape with a plurality of protrusions as a result of protrusions and recesses being formed along the plate surface.
  • the shaft 95 is formed on one protrusion, and through holes 91, 92, 93, and 94 are formed in protrusions at other positions.
  • the shaft 95 of the HST linkage stay 90 is coupled to the vehicle body frame 1 ( Fig. 1 , etc.) so as to be swingable.
  • An end portion of a rod 83 that couples the HST 50 and the HST linkage stay 90 to each other is pivotably supported by the through hole 92.
  • the through hole 91 is used to couple another member (not shown) to the HST linkage stay 90.
  • the other through holes 93 and 94 are used in the following manner.
  • a cylinder 81 for alleviating a rapid operation transmitted to the HST 50 is coupled to the HST linkage stay 90 via an interposed member 101.
  • One end portion of the cylinder 81 is fixed to the vehicle body frame 1, and the other end portion is coupled to a fastening portion 101c of the interposed member 101.
  • the through hole 93 of the HST linkage stay 90 is elongated, and a lock member 101b of the interposed member 101 is movable along the elongated through hole 93.
  • a fastening portion 101a of the interposed member 101 is coupled to the through hole 94 of the HST linkage stay 90.
  • the cylinder 81 expands and contracts, and the lock member 101b of the interposed member 101 moves along the elongated through hole 93.
  • a rapid operation transmitted to the HST 50 can be alleviated.
  • the HST linkage stay 90 of the HST linkage mechanism 120 is made of a single plate, and the configuration can be simplified.
  • the second pipe 63b of the coupling tube 63 is slightly larger than the first pipe 63a and the third pipe 63c.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)

Claims (4)

  1. Arbeitsfahrzeug, umfassend:
    einen Landfahrzeugaufbau (100),
    eine Antriebsmaschinensektion (2), die in einem vorderen Abschnitt des Landfahrzeugaufbaus (100) vorgesehen ist,
    eine Motorhaube (20), die die Antriebsmaschinensektion (2) bedeckt,
    eine Fahrersektion (4), die rückwärts von der Antriebsmaschinensektion (2) vorgesehen ist, wobei die Fahrersektion einen Fahrersitz (42) aufweist,
    einen Motor (21), der im Inneren der Motorhaube (20) vorgesehen ist,
    einen Luftreiniger (24), der im Inneren der Motorhaube (20) über dem Motor (21) zum Verarbeiten von Außenluft vorgesehen ist, die dem Motor (21) zugeführt werden soll,
    ein Ansaugrohr (61), das mit dem Luftreiniger (24) zum Ansaugen von Luft in den Luftreiniger (24) gekoppelt ist, und
    ein Kopplungsrohr (63), das zwischen dem Motor (21) und dem Luftreiniger (24) zum Zuführen von verarbeiteter Luft an den Motor (21) gekoppelt ist, die bereitgestellt wird, indem Außenluft durch den Luftreiniger (24) durchgeleitet wird,
    dadurch gekennzeichnet, dass das Kopplungsrohr (63) ein drittes Rohr (63c), das mit einer oberen Öffnung des Motors (21) gekoppelt ist, ein zweites Rohr (63b), das sich nach oben und nach rechts von dem dritten Rohr (63c) krümmt und sich in einer Rechts-Links-Richtung des Landfahrzeugaufbaus (100) erstreckt, und ein erstes Rohr (63a) beinhaltet, das sich von dem zweiten Rohr (63b) zu einem Abgasabschnitt (24f) hin krümmt, der an einer lateralen Seite des Luftreinigers (24) zum Abführen der verarbeiteten Luft vorgesehen ist, und sich zu dem Luftreiniger (24) hin erstreckt, und dass
    sich das erste Rohr (63a) nach vorne und nach rechts von dem Abgasabschnitt (24f) erstreckt, sich nach vorne und nach links krümmt und mit dem zweiten Rohr (63b) gekoppelt ist, dass das zweite Rohr (63b) des Kopplungsrohrs (63) größer in Größe oder Durchmesser ausgebildet ist als das erste Rohr (63a) und das dritte Rohr (63c) des Kopplungsrohrs (63), und dass der Luftreiniger (24) eine in Längsrichtung langgestreckte zylindrische Form aufweist, wobei sich eine Längsrichtung parallel zur Rechts-Links-Richtung des Landfahrzeugaufbaus (100) erstreckt.
  2. Arbeitsfahrzeug nach Anspruch 1, wobei
    sich das Kopplungsrohr (63) von dem Motor (21) in der Rechts-Links-Richtung des Landfahrzeugaufbaus (100) erstreckt, sich danach zu dem Abgasabschnitt (24f) hin krümmt und mit dem Abgasabschnitt (24f) gekoppelt ist.
  3. Arbeitsfahrzeug nach einem der Ansprüche 1 oder 2, wobei
    sich das Ansaugrohr (61) von einem Abschnitt erstreckt, bei dem das Ansaugrohr (61) mit dem Luftreiniger (24) gekoppelt ist, sich danach zu einer Position vor dem Luftreiniger (24) erstreckt und sich zu einer Position krümmt und erstreckt, die sich rückwärts in Bezug auf den Landfahrzeugaufbau (100) befindet.
  4. Arbeitsfahrzeug nach Anspruch 3, wobei das Arbeitsfahrzeug ferner umfasst:
    einen Kühler (23), der rückwärts von dem Motor (21) vorgesehen ist und Kühlwasser zum Kühlen des Motors (21) kühlt, und
    einen Kühllüfter (22), der unmittelbar vor dem Kühler (23) vorgesehen ist,
    wobei sich ein Endabschnitt des Ansaugrohrs (61), bei dem Außenluft angesaugt wird, rückwärts von dem Kühler (23) befindet.
EP19175231.0A 2018-06-15 2019-05-17 Nutzfahrzeug Active EP3591211B1 (de)

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JP2018144358A JP7117929B2 (ja) 2018-07-31 2018-07-31 乗用作業車

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DE10064546C1 (de) * 2000-12-22 2002-07-04 Huf Huelsbeck & Fuerst Gmbh Schließsystem für Kraftfahrzeuge
US6510833B1 (en) * 2001-12-20 2003-01-28 American Diesel & Gas, Inc. Fuel saving combustion engine insulation method and system
US20080287093A1 (en) * 2007-05-18 2008-11-20 Harrington Steven L Retrofit Automobile Radio for Older Automobiles
JP5229145B2 (ja) * 2009-07-17 2013-07-03 スズキ株式会社 車両用エンジンの吸気装置
JP6221891B2 (ja) * 2014-03-27 2017-11-01 スズキ株式会社 過給機付き内燃機関の吸気装置
JP6226816B2 (ja) * 2014-05-26 2017-11-08 株式会社クボタ 作業機
JP5714197B1 (ja) * 2014-09-04 2015-05-07 株式会社小松製作所 ホイールローダ
JP6449020B2 (ja) * 2015-01-05 2019-01-09 株式会社クボタ 草刈機
JP6421084B2 (ja) 2015-06-19 2018-11-07 株式会社クボタ 作業車両
US9914487B2 (en) 2015-11-06 2018-03-13 Kubota Corporation Work vehicle
JP6604913B2 (ja) 2016-04-26 2019-11-13 株式会社クボタ 作業車
US10377219B2 (en) * 2016-08-31 2019-08-13 Kubota Corporation Tractor

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