CN111492765A

CN111492765A - Working machine

Info

Publication number: CN111492765A
Application number: CN201911346468.5A
Authority: CN
Inventors: 谷口大辅; 儿岛祥之
Original assignee: Kubota Corp
Current assignee: Kubota Corp
Priority date: 2014-05-26
Filing date: 2015-03-31
Publication date: 2020-08-07
Anticipated expiration: 2035-03-31
Also published as: CN105309093A; CN116369010A; JP2015223870A; JP6226816B2; CN105309093B; CN111492765B

Abstract

A work machine, comprising, in a power unit (8) located in a front part of a machine body: a hood (20) covering the outer periphery; and an air cleaner (28) located inside the hood (20), wherein a brake pedal (17) protruding upward from the step (13) of the operation section is provided in the operation section (14) located at the rear of the power section (8), and a rear side intake opening (73) for the air cleaner (28) is formed in a portion located above the step (17) of the operation section and close to the brake pedal (17) in the rear side surface of the hood (20) facing the operation section (14). The air filter can supply combustion air well no matter how different the operation condition is.

Description

Working machine

This application is a divisional application of the following patent applications:

application No.: 201510148479.8

Application date: 31/03/2015

The invention name is as follows: working machine

Technical Field

The present invention relates to a working machine such as a riding rice transplanter and an agricultural tractor, and more particularly to a working machine in which an engine is mounted on a power unit located in a front portion of a machine body.

Background

In the above work machine, the power unit includes an air cleaner for supplying combustion air to the engine. In the conventional art, an intake pipe of an air cleaner is extended downward from a power unit, and an intake port at a tip end may be opened downward from a lower portion of the power unit (see, for example, patent document 1).

In the working machine, the engine is mounted and supported on the machine body frame by the rubber mount, and the power unit includes a muffler for discharging exhaust gas from the engine to the outside. In the related art, a muffler is supported by a bracket having a longitudinal plate shape provided on the muffler and fastened by bolts to an end edge of a support plate fastened and fixed to a lateral side surface of an engine in a longitudinal posture (see, for example, patent document 1).

In the work machine, an electric starter motor is provided in the vicinity of the engine to start the engine. Further, in the conventional art, there is provided a ventilation gas release pipe provided in the starter motor, and the ventilation gas release pipe is in a state in which: the starter motor is extended in a substantially horizontal posture from the starter motor, and the tip opening portion is opened to the inside of a space laterally covered on the outer side by a cover plate provided on the lateral side of the starter motor (see, for example, patent document 2).

Patent document 1: japanese patent laid-open publication No. 2003-261071

Patent document 2: japanese laid-open patent publication No. 11-350933

Disclosure of Invention

Problems to be solved by the invention

In the above-described conventional structure, the intake port of the air cleaner is opened downward from the lower portion of the power unit, and therefore, there are the following disadvantages.

That is, in the above-described conventional structure, soil or the like splashed from the traveling wheels during work may scatter to the intake port of the air cleaner to block the intake port, or in the case of work in a paddy field or the like, the intake port of the air cleaner may be submerged in water to block the intake port, and the air cleaner may not be able to supply combustion air satisfactorily.

Therefore, it is desired that the air cleaner can supply combustion air well regardless of the operation state.

In the above-described conventional structure, a small vertical plate-shaped bracket of the muffler is bolted to an end edge of a support plate that is fixedly connected to a lateral side surface of the engine in a vertical posture, thereby supporting the muffler. In such a configuration, the coupling structure between the support plate in the vertical posture and the muffler does not have a sufficiently large support strength, and vibration generated in accordance with the operation of the engine tends to cause looseness at the coupling portion between the support plate in the vertical posture and the bolt coupling portion of the bracket, and there is a possibility that a good support state of the muffler cannot be maintained for a long period of time.

Therefore, it is desired that the muffler be supported well for a long period of time regardless of the vibration of the engine.

In the above-described conventional structure, the distal end opening portion of the air release pipe provided in the starter motor is disposed in the closed space provided laterally to the starter motor, and therefore, rainwater, soil scattered from the outside, and the like do not enter the closed space due to the cover plate, and the possibility of erroneous suction of rainwater or soil from the distal end opening portion of the air release pipe is small.

However, in the conventional configuration, when the paddy field working machine such as a rice transplanter which is applied as a working machine to perform paddy field work is operated in a paddy field with a deep soil layer, the body is buried in the soil, the opening portion at the tip of the air release pipe is submerged in water, or muddy water is scattered strongly, and water enters the inside of the starter motor, which leaves room for improvement.

Accordingly, it is desirable to provide a work machine that can reliably prevent moisture from entering the inside of the starter motor.

Means for solving the problems

The 1 st structural feature of the working machine of the present invention is that,

the power part positioned at the front part of the machine body is provided with: a hood covering the outer periphery; and an air cleaner located inside the hood,

a brake pedal protruding upward from a step of the driving portion is provided in the driving portion located at the rear of the power portion,

a rear side intake port for the air cleaner is formed in a rear side surface of the hood facing the driver's seat, at a position located above the driver's seat step and close to the brake pedal,

a lateral side intake port connected to a rear side intake port formed in the rear side surface is formed in the lateral side surface of the hood,

a lock member is provided in the vicinity of the brake pedal in the lateral direction, the lock member being capable of freely holding the position of the brake pedal in a step-in operation state or releasing the holding of the step-in operation state,

the side intake port is formed at a position close to the lock,

a radiator for cooling the engine is provided in the hood in a state where cooling air flows in a transverse width direction of the machine body,

an upper surface of a ventilation guide member that is positioned on an outer peripheral portion of the radiator and guides cooling air, the ventilation guide member being formed to be inclined forward and downward along an upper surface of the hood that is inclined forward and downward, and an elastic closing member being interposed between the upper surface of the ventilation guide member and the upper surface of the hood,

a partition member for partitioning between an intake passage portion of the radiator and an intake portion of the air cleaner in the hood,

the radiator has a shielding member at a lower portion thereof for preventing scattering of soil from a driving wheel.

With this configuration, since the rear side intake port for the air cleaner is formed in the rear side surface of the hood facing the cab at a position above the step of the cab, there is no fear that soil or the like splashed from the traveling wheels may be scattered to the intake port of the air cleaner and clog the intake port in association with work, or in the case of performing work in a paddy field or the like, there is no fear that the intake port of the air cleaner may be submerged in water and clog the intake port, and the air cleaner can satisfactorily supply air for combustion.

Further, since the air cleaner has the brake pedal projecting upward from the step of the driver's seat and the rear side intake port for the air cleaner is formed in a portion close to the brake pedal, the following advantages are obtained.

The working machine may perform work in a state where crops, fertilizers, chemicals, and the like planted on the land are stacked on the steps of the driving portion. For example, in a case of a rice transplanter for planting seedlings in a paddy field as a working machine, a preliminary seedling for planting may be stacked on a step of a driving part.

When such prepared seedlings are stacked in large numbers on the step of the cab, the rear side intake port may be clogged with the prepared seedlings. However, according to this configuration, since the brake pedal is present in a portion close to the rear side intake port, a gap is formed between the preliminary seedling and the step of the cab by the brake pedal, and the outside air can be favorably taken in from the side intake port without being hindered by the preliminary seedling. Further, if the above-described stacked object is not stacked on the step of the cab, the rear side intake port is not closed, and therefore, the intake of the outside air from the side intake port can be performed well.

Therefore, the air cleaner can supply the combustion air well regardless of the operation state.

With this configuration, since the side-side intake port connected to the rear-side intake port formed in the rear side surface is formed in the lateral side surface of the hood, a large intake port for the air cleaner can be used, the amount of intake air can be increased, and even if one of the rear-side intake port and the side-side intake port is clogged, the intake air can be secured by the other intake port. Therefore, the air cleaner can supply the combustion air more favorably.

In the present invention, the lock member is provided in the vicinity of the brake pedal, and the lock member is capable of holding and releasing the brake pedal, and the lock member holds the position of the brake pedal in the step-in operation state in the position-held state, and the side-side intake port is formed in a portion close to the lock member.

In some work vehicles, work is performed in a state where crops, fertilizers, chemicals, and the like planted on the ground are stacked on the steps of the driving portion. In a case of a rice transplanter for planting rice seedlings in a paddy field, a working machine may stack prepared seedlings for planting on a step of a driving part.

When such prepared seedlings are stacked in large numbers, there is a possibility that the side intake ports are clogged with the prepared seedlings. However, according to this configuration, since the lock is provided in the portion close to the side-side intake port, a gap is formed between the preliminary seedling and the step of the cab by the brake pedal, and the outside air can be favorably taken in from the side-side intake port without being hindered by the preliminary seedling.

With this configuration, since the partition member is provided to partition the space between the intake path portion of the radiator and the intake portion of the air cleaner in the hood, the cooling air flowing along the intake path portion of the radiator and the combustion air flowing from the rear side intake port and the side intake port to the air cleaner can flow well in a state partitioned by the partition member without affecting each other.

Therefore, both cooling of the engine and intake of combustion air can be performed well.

In the present invention, the upper surface of the ventilation guide member, which is located at the outer periphery of the radiator and guides the cooling air, is formed to be inclined downward and forward along the upper surface of the hood, and the elastic closing member is interposed between the upper surface of the ventilation guide member and the upper surface of the hood.

That is, since the upper surface of the hood is inclined downward, the driver can easily visually confirm the working area in the vicinity of the front side of the machine body when driving. Further, since the hood is swingably opened and closed for maintenance, the upper surface of the ventilation guide member is formed to be inclined forward and downward, and the elastic closing member is interposed between the upper surface of the ventilation guide member and the upper surface of the hood, a pressing force in only the compression direction is applied to the elastic closing member in accordance with the opening and closing of the hood, and a pressing force in the inclined direction is not applied, so that there is no disadvantage such as friction loss, and the durability of the elastic closing member can be improved.

With this configuration, since the shielding member is provided at the lower portion of the radiator, it is possible to prevent the mud from scattering from the traveling wheel toward the radiator as the vehicle travels, and to easily avoid the early clogging of the radiator.

The 2 nd structure of the working machine of the present invention is characterized in that,

the side intake port is formed at a position close to the lock,

an upper surface of a ventilation guide member that is positioned on an outer peripheral portion of the radiator and guides cooling air is formed to be inclined forward and downward along an upper surface of the hood that is inclined forward and downward, and an elastic closing member is interposed between the upper surface of the ventilation guide member and the upper surface of the hood.

The 3 rd structural feature of the working machine of the present invention is that,

a lock member is provided in the vicinity of the brake pedal, the lock member being capable of freely holding the position of the brake pedal in a step-in operation state or releasing the holding of the step-in operation state,

the side intake port is formed at a position close to the lock,

the radiator has a partition member for partitioning between an intake passage portion of the radiator and an intake portion of the air cleaner in the hood.

The 4 th structural feature of the working machine of the present invention is that,

the side intake port is formed at a position close to the lock.

The 5 th structural feature of the working machine of the present invention is that,

a side intake port connected to a rear side intake port formed in the rear side surface is formed in the lateral side surface of the hood.

The 6 th structural feature of the working machine of the present invention is that,

a rear side intake port for the air cleaner is formed in a rear side surface of the hood facing the driver section, at a position located above the driver section step and close to the brake pedal.

The 7 th structural feature of the working machine of the present invention is that,

the power part positioned at the front part of the machine body is provided with: an engine and a silencer, wherein the engine is connected with the silencer,

the engine is loaded and supported on the engine body frame through rubber supports which are respectively arranged at the left and right positions in the front and the back,

an engine side connecting member which is provided across the rubber mounts at two positions on the front side and is connected to the engine, and which is formed to extend laterally outward,

the muffler is supported by an outwardly extending portion of the engine-side coupling member,

an exhaust pipe for guiding exhaust gas from the engine to the muffler is supported by the engine-side coupling member,

the muffler is disposed at one side of the power part in the transverse direction in a posture facing the front-rear direction, and an exhaust port of the muffler is positioned at the rear side of the machine body and is formed to open downward,

the engine is provided with an output shaft in a lateral posture along a lateral width direction of the machine body.

With this configuration, the engine is mounted and supported on the body frame by the rubber mount provided at four positions in total, i.e., the front and rear, of the left and right two positions, respectively. An engine-side coupling member coupled to the engine is provided across two rubber mounts located on a front side and is formed to extend laterally outward, and the muffler is supported by an outward extending portion of the engine-side coupling member.

Since the engine and the muffler vibrate integrally by supporting the muffler to the engine-side coupling member coupled to the engine in this manner, the possibility that the coupling portion of the exhaust pipe is cracked or the like due to the different vibration modes of the engine and the muffler is reduced as compared with a structure in which the muffler is supported to the body frame side, for example.

Since the engine-side coupling member is provided so as to straddle the rubber mount at two positions located on the front side, the muffler can be stably supported, and since the muffler is formed in an extended configuration on the lateral outer side, the shape of the outer extending portion is not restricted, and the muffler can be stably and firmly supported, for example, by a configuration in which the muffler is supported and held from the lower side. Furthermore, there are advantages in that: by using such an engine-side coupling member, the muffler can be disposed at a low position on the lateral side of the engine in the power unit, and when the exhaust gas is discharged to the lower side of the engine body, the exhaust pipe can be shortened, and the structure can be simplified.

Therefore, the muffler can be supported well for a long period of time regardless of the vibration of the engine.

In the present configuration, since the exhaust pipe that guides the exhaust gas from the engine to the muffler is supported by the engine-side connecting member, the connecting portion of the exhaust pipe to the engine, the connecting portion to the muffler, and the intermediate portion therebetween are supported by the engine and the member integrally connected to the engine, respectively, and therefore, the vibration of the exhaust pipe can be suppressed, and the exhaust pipe can be stably supported in a state in which cracking or the like is unlikely to occur.

In the present configuration, the muffler is disposed on one lateral side of the power unit in a posture facing the front-rear direction, and the exhaust port is formed to be located on the rear side of the machine body and open downward, so that the exhaust gas from the muffler is discharged from the rear side of the machine body to the lower side of the machine body.

Therefore, the exhaust gas of the engine can be guided to the outside of the engine body through a low position on the lower side of the engine body without falling to other members provided in the engine body.

With this configuration, since the engine is disposed in a lateral posture with its output shaft along the lateral width direction of the machine body, the engine can be disposed at the front side portion in the power unit, and the front-rear weight balance of the machine body, which is easily made heavier at the rear by the rear-coupled working device, can be improved.

The 8 th structural feature of the working machine of the present invention is that,

the muffler is disposed at one side of the power unit in the lateral direction in a posture facing the front-rear direction, and an exhaust port of the muffler is formed to be located at the rear side of the body and to be open downward.

The 9 th structural feature of the working machine of the present invention is that,

an exhaust pipe for guiding exhaust gas from the engine to the muffler is supported by the engine-side coupling member.

The 10 th structural feature of the working machine of the present invention is that,

the muffler is supported by an outwardly extending portion of the engine-side coupling member.

The 11 th structural feature of the working machine of the present invention is that,

comprising: a starter motor for starting the engine; and a gas discharge pipe for discharging gas from the starter motor,

the air release pipe is connected to the steering column in a state that a tip end portion is opened to the inside of the steering column,

the bleeder is set to a state: the intermediate portion located in between the connection portion to the starter motor and the connection portion to the steering column is at a higher position than those of the starter motor and those of the steering column.

In the above configuration, the air release pipe for releasing air from the starter motor is connected to the steering column in a state where a distal end portion thereof is open to an inside of the steering column, and the steering column is formed in a cylindrical shape and is formed to be vertically long in a state where the steering shaft is inserted therein. Further, since the steering wheel column is covered with the operation panel on the upper side and the steering operation mechanism is connected to the lower side, there is little possibility that rainwater, mud, or the like enters the inside of the steering wheel column even if, for example, rainwater or cleaning water falls down or the machine body is submerged in a paddy field. As a result, clean air is always present inside the steering column.

Therefore, the distal end portion of the air release pipe communicates with the inside of the steering wheel column in which clean air is present, and moisture can be prevented from entering the inside of the starter motor.

With this configuration, the intermediate portion between the connection portion to the starter motor and the connection portion to the steering wheel column of the bleed pipe is located at a higher position than the connection portion, and therefore, even if moisture enters the interior from the steering wheel column side, it is difficult to move to the starter motor side beyond the higher position of the intermediate portion, and it is possible to prevent the moisture from entering the starter motor.

The work machine 12 th structural feature of the present invention is that,

the exhaust pipe is connected to the steering column with a distal end portion thereof open to the inside of the steering column.

Drawings

Fig. 1 is an overall side view of a riding rice transplanter.

Fig. 2 is an overall plan view of the riding rice transplanter.

Fig. 3 is a side view of the power section.

Fig. 4 is a plan view of the power section.

Fig. 5 is a front view of the radiator arrangement portion.

Fig. 6 is a right side view of the front of the body.

Fig. 7 is a perspective view of the vicinity of the brake pedal.

Fig. 8 is a perspective view of the power unit.

Fig. 9 is a partially exploded perspective view of the power unit.

FIG. 10 is a perspective view of the engine frame.

FIG. 11 is a side view of the muffler.

Fig. 12 is a side view showing the arrangement state of the purge pipe.

Description of the symbols

7 engines

7a output shaft

8 power part

13 step of driving part

14 steering unit

17 brake pedal

19 locking element

20 hood

24 steering wheel support

26 radiator

28 air filter

29 silencer

31 starting motor

32 rubber support

33 machine body frame

38 engine side connection member

42 externally extending part

49 exhaust pipe

54 exhaust port

56 Ventilation guide Member

63 elastic closing member

73 rear side intake port

74 side intake

80 air release pipe

S partition member

Intake path portion of Q1

Q2 air inlet part

Detailed Description

Next, a case where the working machine according to the embodiment of the present invention is applied to a riding type rice transplanter will be described with reference to the drawings.

As shown in fig. 1 and 2, the riding rice transplanter includes a traveling body 3, the traveling body 3 includes a pair of left and right front wheels 1 and a pair of left and right rear wheels 2 that are capable of traveling, and a seedling planting device 6 of eight-row planting type is connected to a rear portion of the traveling body 3, and the seedling planting device 6 is capable of being operated by an operation of a lift cylinder 4 through a link mechanism 5.

A power unit for housing the engine 7 and a transmission 9 for housing a transmission mechanism are disposed on the front side of the travel machine body 3. An operator's section 14 is disposed in the center of the travel machine body 3, and the operator's section 14 includes a steering wheel 10, an operator's seat 11, a shift lever 12, an operator's section step 13, and the like. Further, on both right and left sides of the front portion side of the traveling machine body 3, there are prepared seedling placement tables 15 for stacking prepared seedlings for planting.

The transmission 9 includes a hydrostatic continuously variable transmission device 16, and the continuously variable transmission device 16 is operated to shift the speed of the traveling machine body 3 in one of forward and backward directions by operating the shift lever 12, and the power from the engine 7 is shifted by the continuously variable transmission device 16, and the power after the shift is transmitted to the front wheels 1 and the rear wheels 2 to drive the traveling. A brake pedal 17 for braking during traveling is provided on the right front portion of the operator's seat 11 of the operator's seat step 13.

As shown in fig. 6 and 7, the brake pedal 17 is configured to be able to be held in a brake-applied position by a depressing operation by a lock 19 provided at a position near the right side thereof. That is, when the travel is stopped during the work or the like, the brake pedal 17 can be held in a braking state.

The lock member 19 is provided to be swingable between a lock operation position where the brake pedal 17 is held in position and a release position where the brake pedal 17 is not held in position, and is biased to swing toward the release position by a spring (not shown) (a state shown in fig. 6). When the brake pedal 17 is held in the braking state, in the braking state in which the brake pedal 17 is depressed by a foot, the lock member 19 is manually switched to the lock operation position, and the locking recess 19a formed in the lock member 19 is locked to the locking member 17a provided in the brake pedal 17, so that the brake pedal 17 can be held in the braking state.

The cab step 13 is provided not only under the feet of the driver in the cab 14 but also in a manner to be continuous with laterally outer portions on both left and right sides of the power unit 8, and is formed with a vertical passage so that the cab 14 can be raised and lowered from the front of the body.

The seedling planting device 6 is constituted to have: a seedling placing table 6A for placing eight rows of seedlings for planting; a planting mechanism 6B for cutting and taking seedlings one by one from the lower part of the seedling placing table 6A and planting the seedlings into the ground; and a soil preparation float 6C for preparing soil on the field surface, and the seedling planting device 6 plants the seedlings into the soil as the machine body travels.

As shown in fig. 1 to 4, the outer periphery of the power unit 8 is covered with a hood 20. That is, the upper portion, the front and rear side portions, and the lateral side portions of the power unit 8 are covered by the hood 20 disposed at the front portion of the travel machine body 3. The hood 20 includes: a movable hood 21 covering a front side portion of the power unit 8; and a stationary hood 22 covering a rear side portion of the power unit 8. The upper surface of the movable hood 21 is formed in a shape inclined downward and forward as it approaches the front side of the machine body.

The movable hood 21 is supported so as to be swingable around left and right axial cores located at an upper portion in the power unit 8, and is configured to be swingable to open and close with respect to the fixed hood 22. Ventilation openings 23 for taking air into the power unit 8 are formed in both right and left side portions of the movable hood 21. The inside of the fixed hood 22 includes: a steering column 24 rotatably supporting the steering wheel 10; and an operation connecting mechanism 25 for operating the continuously variable transmission device 16 of the shift lever 12, and the like.

Inside the hood 20 of the power unit 8, there are: a water-cooled engine 7; a radiator 26 for cooling the engine 7; a cooling fan 27 that passes cooling air to the radiator 26; an air cleaner 28 for supplying combustion air to the engine 7; a muffler 29 for discharging exhaust gas from the engine 7 to the outside; a generator 30; and a starter motor 31 for engine power generation.

The support structure of the engine 7 will now be described.

The engine 7 is mounted on an engine frame 33 constituting a part of the machine body frame via a rubber mount 32 with its output shaft 7a in a lateral posture in the lateral direction. As shown in fig. 10, the engine frame 33 is formed in a substantially rectangular frame shape in a plan view. And is connected and fixed to a front side of the transmission case 9 constituting a part of the body frame and extends forward.

The engine frame 33 has a pair of left and right front placement portions 34 that face downward toward the rear in a front portion thereof, and a pair of left and right rear placement portions 35 that face downward toward the front in a rear portion thereof. The engine 7 is mounted and supported on the engine frame 33 in a state in which vibration can be absorbed via the rubber mount 32 at four total locations of the pair of right and left front placement portions 34 and the pair of right and left rear placement portions 35, respectively, and the rubber mount 32 is provided with connecting bolts 37 on both upper and lower sides of the vibration-proof rubber 36.

The engine 7 is supported by the engine-side coupling member 38 with respect to the rubber mount 32 located at two positions on the front side. As shown in fig. 8 and 9, the engine-side connecting member 38 is configured to be continuously connected to the rubber mount 32 at two locations on the front side, and integrally connects an inclined mounting portion 39 connected to the rubber mount 32 at two locations on the front side, a vertical connecting portion 40 connected and fixed to the engine 7, and a reinforcing rib 41 connecting these components. The vertical connecting portion 40 is bolted to the front side surface of the engine 7 at a plurality of locations, and the inclined mounting portion 39 is connected to the upper portion of the rubber mount 32 at two locations on the left and right.

Next, a support structure of the muffler 29 will be described.

As shown in fig. 8 and 9, the engine-side coupling member 38 is integrally connected to the left-side outer side of the machine body by bolts, and an outer extension 42 is formed to extend outward. Further, a muffler support portion 43 for placing and supporting the muffler 29 is formed on the outwardly extending portion 42 of the engine side connecting member 38. The muffler support portion 43 has an arc-shaped receiving surface 44 for receiving and supporting the muffler 29 having a cylindrical outer shape. Further, the structure is such that: the muffler 29 placed on the receiving surface 44 is held by a substantially U-shaped pressing member 45. The pressing member 45 has screw portions 46 formed at both side ends thereof, and presses the muffler 29 from the upper side in a state where the muffler is placed on the receiving surface 44, and the muffler 29 is held by inserting the both side ends through insertion holes 47 formed at both right and left side portions of the receiving surface 44 and then fastening the both side ends with nuts 48 from the lower side.

An exhaust pipe 49 that leads exhaust gas from the engine 7 to the muffler 29 by connecting the exhaust part 7b of the engine 7 to the muffler 29 is divided into an engine-side exhaust pipe 49a and a muffler 29-side exhaust pipe 49 b. The exhaust pipe 49a on the engine side and the exhaust pipe 49b on the muffler 29 side are connected by flange connection in the middle, and form a continuous exhaust path. Further, at a portion where the exhaust pipe 49a on the engine side and the exhaust pipe 49b on the muffler 29 side are flange-coupled, the flange portion 50 on the engine side is formed wider than the flange portion 51 on the muffler 29 side, and the flange portion 50 on the engine side is fixedly coupled to the support portion 52 integrally formed with the engine side coupling member 38 by the bolt 53.

With this configuration, the exhaust pipe 49 is connected and fixed to the engine 7 in a state of vibrating integrally with the engine 7 at each of the connection portion to the engine 7, the flange connection portion of the relay portion, and the connection portion to the muffler 29, and the exhaust pipe 49 can be supported in a state in which there is little possibility of cracking or the like due to vibration of the engine 7.

As shown in fig. 8 and 9, the muffler 2 is provided such that an inlet portion connected to the exhaust pipe 49 is located on the front side of the engine body, and an exhaust portion for discharging exhaust gas to the outside extends in the front-rear direction while being located on the rear side of the engine body. As shown in fig. 11, the exhaust port 54 for discharging the exhaust gas to the outside is formed to be opened downward. In this way, the exhaust port 54 opens downward, so that the exhaust gas of the engine 7 can be prevented from being discharged to the driver part 14 and the seedling planting device 6.

The heat sink 26 is explained below.

As shown in fig. 4 and 5, a radiator 26 for cooling the engine 7 is disposed at a right portion of the engine 7. The radiator 26 is connected and fixed by a pair of brackets 55 provided on the engine frame 33 on the lower surface thereof. The radiator 26 is disposed with the suction side surface of the heat exchange portion facing in the lateral outward direction. A cooling fan 27 is disposed between the radiator 26 and the engine 7.

As shown in fig. 4, 5, and 8, a radiator cover 56 is provided as a ventilation guide member, and the radiator cover 56 covers the outer periphery of the radiator 26 and the outer periphery of the cooling fan 27. The radiator cover 56 has a function as a fan shroud for guiding the cooling air flowing by the cooling fan 27 through the heat exchanging portion, and is supported by fixing an appropriate portion to the radiator 26.

The cooling fan 27 is linked to the output shaft 7a of the engine 7 via a transmission belt 57. The cooling fan 27 is driven by the power of the engine 7, and generates cooling air that flows from the vent 23 through the radiator 26 into the engine 7. The output shaft 7a of the engine 7 is linked to the generator 30 through a transmission belt 57.

As shown in fig. 3, 4, 5, and 8, the radiator cover 56 has an outer peripheral covering portion 61, and the outer peripheral covering portion 61 includes: a longitudinal portion 58 covering the front side of the front side end face of the radiator 26; an upper lateral portion 59 as an upper surface covering an upper surface of the heat sink 26; and a longitudinal portion 60 covering a rear portion side of a rear end surface of the radiator 26, and the radiator cover 56 has an air blow guide portion 62 for guiding air blow, and the air blow guide portion 62 is connected to an inner side of the housing of the outer peripheral covering portion 61 and covers an outer peripheral portion of the cooling fan 27.

The upper lateral portion 59 of the radiator cover 56 is formed in a shape inclined forward and downward along the upper surface 21a of the movable hood 21 in a shape inclined forward and downward, and an elastic closing member 63 made of a sponge material is interposed between the upper lateral portion 59 of the radiator cover 56 and the upper surface of the movable hood 21. Also, an elastic closing member 63 made of a sponge material is similarly interposed between the front-side longitudinal portion 58 of the radiator cover 56 and the front side surface of the movable hood 21. The elastic closing member 63 acting on the upper lateral portion 59 of the radiator cover 56 is fixed by adhesion to the movable hood 21. The elastic closing member 63 acting on the front side longitudinal portion 58 of the radiator cover 56 is mounted and supported by a bracket 21c bolted to the inner surface of the movable hood 21.

As described above, since the upper lateral portion 59 of the radiator shroud 56 is formed in the shape inclined in the forward and downward direction in the same manner as the movable hood 21, when the movable hood 21 is opened and closed, only a force in the compression direction acts on the elastic closing member 63, and a state in which there is no disadvantage such as friction loss is obtained, so that the abrasion of the elastic closing member 63 is small, and the durability is improved.

Between the longitudinal portion 60 on the rear side of the radiator shroud 56 and the right side face 22a of the fixed hood 22, there is an elastic closing member 63 made of a sponge material, the elastic closing member 63 partitioning two parts: an intake path portion Q1 through which cooling air of the radiator 26 passes; and an intake portion Q2 of the air cleaner 28 located in the vicinity of the rear side of the body of the longitudinal portion 60 on the rear side of the radiator 26. The intake portion Q2 of the air cleaner 28 will be described later in detail.

Therefore, the longitudinal portion 60 on the rear side of the radiator cover 56 and the elastic closing member 63 provided in correspondence thereto constitute a partition member S that partitions between the intake passage portion Q1 of the radiator 26 and the intake portion Q2 of the air cleaner 28 in the hood 20. The elastic closing member 63 provided at this position is adhesively fixed to the radiator shroud 56.

As shown in fig. 5 and 6, a shielding member 64 for preventing soil from being scattered from the front wheel 1, which is a running wheel, is provided below the radiator 26. The shielding member 64 is fixed at its lower portion to a pair of radiator support brackets 55 provided on the engine frame 33 by a bolt fastening method, and is set in an inclined posture such that it is positioned laterally outward as it approaches the upper side. The shielding member 64 is formed of a wide plate body, and is positioned between the front wheel 1 and the radiator 26 in a substantially vertical posture. The shield member 64 is provided to receive the soil splashed from the front wheel 1 and prevent the soil from scattering to the radiator 26.

A notch 65 is formed in a lower portion of the front portion of the shield member 64 in an inclined shape so as not to interfere with the front wheel 1 when the steering operation is performed. Further, a gap is formed between the upper end edge 64a of the shielding member 64 and the operation portion step 13. In this way, the gap is provided between the upper edge 64a of the shielding member 64 and the operator's seat 13, thereby facilitating the assembling work.

Next, the air cleaner 28 will be described.

The air cleaner 28 is disposed in a state of being positioned at the rear upper side of the engine 7. The air cleaner 28 is formed in a substantially cylindrical shape, and is supported in a lateral posture with its axial direction being in a lateral direction by a member fixedly extended from a support portion 66 fixed to the body side of the steering column 24.

A supply pipe 71 is connected to a left end of the air cleaner 28, and the other end of the supply pipe 71 is connected to an air supply portion of the engine 7. an intake pipe 72 extends obliquely downward from an arc-shaped outer peripheral portion near the left end of the air cleaner 28, and the intake pipe 72 is bent in a substantially L shape in plan view and extends leftward and outward to a position close to the hood 20.

As shown in fig. 4, 6, and 7, a rear side intake port 73 is formed in the rear side surface 22b of the fixed hood 22 at a position above the cab step 13 with respect to the air cleaner 28. Further, a side-side intake opening 74 that is continuous with the rear-side intake opening 73 is formed in the right side surface 22a of the fixed hood 22. That is, the rear side intake port 73 and the side intake port 74 are continuously connected, and thereby a large intake port 75 is formed at a corner of the fixed cowl 22.

As shown in fig. 4, the intake pipe 72 of the air cleaner 28 is provided in a state in which: the intake opening 72a is provided to face the large intake port 75 formed at a corner of the fixed cowl 22 in a state close to the large intake port 75. With this configuration, the air cleaner 28 can suck clean air above the cab step 13 as combustion air.

As shown in fig. 7, the rear side intake port 73 is formed in a portion of the rear side surface 22b of the fixed hood 22 that is located above the cab step 13 and is close to the brake pedal 17. Since the brake pedal 17 is provided in the vicinity of the rear side intake port 73 in this manner, even when a large number of prepared seedlings are stacked on the operator's seat step 13, it is easy to avoid the phenomenon that the rear side intake port 73 is clogged with the stacked prepared seedlings.

Further, the side intake port 74 is formed in a portion continuous with the rear intake port 73 and in a portion near the latch 19. Since the lock 19 is provided in the vicinity of the side-inlet 74 in this manner, even when a large number of prepared seedlings are stacked on the operator's seat 13, the side-inlet 74 is easily prevented from being clogged with the stacked prepared seedlings.

As shown in fig. 4, the intake opening 72a of the intake pipe 72 of the air cleaner 28 is provided in a state close to and facing the large intake port 75, and the intake portion Q2 of the air cleaner is located in a position close to the rear side with respect to the intake path portion Q1 through which the cooling air of the radiator passes. Therefore, by providing the partition member S including the longitudinal portion 60 and the elastic closing member 63 on the rear side of the radiator cover 56 as described above, the cooling air flowing in the left-right direction inside the radiator 26 and the combustion air flowing from the large intake port 75 to the air cleaner 28 can flow well in a state partitioned by the partition member S without affecting each other.

Next, the starter motor 31 is explained.

As shown in fig. 3 and 8, the starter motor 31 is disposed at an obliquely front upper portion with respect to the output shaft 7a of the engine 7. The starter motor 31 starts the engine 7 by engaging a pinion 79 driven by the starter motor 31 with a ring gear 78 formed on an outer peripheral portion of a flywheel 77 of the engine 7 and rotationally driving the pinion 79. Since it is necessary to release the engagement between the pinion 79 and the ring gear 78 after the engine 7 is started, the pinion 79 is operated to be slid by a solenoid not shown in the figure into a state of being engaged with the ring gear 78 and a state of being released from the engagement.

Since a gear mechanism for interlocking the starter motor 31 and the pinion 79 is incorporated, the starter motor 31 is integrally formed with a slide operation portion of the solenoid and the pinion 79, and a housing of the starter motor 31 communicating with each other. These housings are formed in a waterproof type so as not to allow moisture to enter the inside.

The starter motor 31 configured in a sealed manner as described above is likely to be at a high temperature due to operation, and therefore, needs to emit heat to the outside, and when moisture enters, needs to emit moisture to the outside.

Therefore, as shown in fig. 12, the starter motor 31 is provided with a gas release pipe 80 for allowing the interior of the starter motor 31 to communicate with the atmosphere. The air release pipe 80 extends rearward from the starter motor 31, and a rear end portion thereof is connected to the steering column 24 in a state of being opened to the inside of the steering column 24. Further, the purge pipe 80 is set in a state: the intermediate portion between the connection portion to the starter motor 31 and the connection portion to the steering column 24 is at a higher position than the connection portion. That is, the gas release pipe 80 is curved in an arch shape in plan view so that the middle portion located in the middle becomes higher. With this configuration, even if moisture enters the steering column 24, the moisture is prevented from moving to the starter motor 31 by the air release pipe 80. The internal space of the starter motor 31 is opened to the atmosphere through the inside of the gas release pipe 80, and heat and moisture inside the starter motor 31 can be released to the outside.

[ other embodiments ]

(1) In the above embodiment, the following configuration is exemplified: the brake pedal 17 has a latch 19 on the lateral side thereof, and a side-side intake opening 74 connected to the rear-side intake opening 73 is formed in the lateral side 22b of the hood, but such a side-side intake opening 74 may not be formed, and only the rear-side intake opening 73 may be provided.

(2) In the above embodiment, the following configuration is made: the partition member S is provided to partition the space between the intake passage portion Q1 of the radiator 26 and the intake portion Q2 of the air cleaner 28 in the hood 20, but the partition member S may be omitted.

(3) In the above embodiment, the following configuration is made: the upper surface of the radiator cover 56 is formed in a shape inclined downward in the forward direction along the upper surface of the hood 20 in the shape inclined downward in the forward direction, and the elastic closing member 63 is interposed between the upper surface of the radiator cover 56 and the upper surface of the hood 20, but the upper surface of the radiator 26 may be configured to be in a horizontal posture without providing such a radiator cover 56.

(4) In the above embodiment, the shielding member 63 is provided at the lower portion of the heat sink 26, but a structure without such a shielding member may be adopted.

(5) In the above embodiment, the muffler 29 is supported by the outwardly extending portion 42 of the engine-side coupling member 38, but instead of this structure, the muffler may be supported by a plate-like frame in the longitudinal posture of the side portion of the engine 7, the plate-like frame supporting the starter motor 31.

(6) In the above embodiment, the following configuration is made: the gas release pipe 80 that releases gas from the starter motor 31 is connected to the steering column 24 in a state of being opened to the inside of the steering column 24, but instead of this configuration, the gas release pipe 80 may be opened at a position near the starter motor 31.

(7) In the above-described embodiments, the working machine is exemplified as an example applied to a riding type rice transplanter, but the present invention is not limited to a rice transplanter, and may be other types of working machines such as an agricultural tractor and a harvester.

Industrial applicability of the invention

The present invention is applicable to a riding type rice transplanter, an agricultural tractor, or other working machines.

Claims

1. A working machine is characterized in that a working machine body,

2. A working machine is characterized in that a working machine body,

3. A working machine is characterized in that a working machine body,

4. A working machine is characterized in that a working machine body,

5. A working machine is characterized in that a working machine body,

6. A working machine is characterized in that a working machine body,