CN111492765B

CN111492765B - Working machine

Info

Publication number: CN111492765B
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: 2023-06-20
Anticipated expiration: 2035-03-31
Also published as: JP2015223870A; CN105309093A; JP6226816B2; CN111492765A; CN105309093B; CN116369010A

Abstract

A work machine has a power unit (8) located at the front of a machine body, and is provided with: a hood (20) covering the outer periphery; and an air cleaner 28 located inside the hood 20, a driver 14 located at the rear of the power unit 8, having a brake pedal 17 protruding upward from the driver step 13, and a rear side air inlet 73 for the air cleaner 28 formed at a portion located above the driver step 17 and close to the brake pedal 17 in a rear side surface of the hood 20 opposite to the driver 14. The present invention can supply combustion air to an air cleaner well regardless of different operation conditions.

Description

Working machine

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

application number: 201510148479.8

Filing date: 2015, 03 and 31 days

The invention name is as follows: working machine

Technical Field

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

Background

In the 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 is sometimes opened downward from a lower portion side of the power unit (for example, see patent literature 1).

In the working machine, the engine is mounted and supported on the machine frame via a rubber mount, and the power unit has a muffler for discharging exhaust gas from the engine to the outside. In the related art, a bracket in the form of a vertical plate provided in a muffler is bolted to an end edge of a support plate that is fixedly coupled to a lateral side surface of an engine in a vertical posture, thereby supporting the muffler (for example, refer to patent document 1).

In the work machine, an electric starter motor is provided near the engine to start the engine. In the prior art, there is a vent pipe for ventilation provided in the starter motor, and the vent pipe is set in such a state that: the starter motor is disposed in a substantially horizontal posture in a state in which the distal end opening is opened to the inside of a space laterally outward covered by a cover plate provided laterally to the starter motor (for example, refer to patent document 2).

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

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

Disclosure of Invention

Problems to be solved by the invention

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

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

Therefore, it is desirable that the air cleaner can satisfactorily supply the combustion air regardless of the operational conditions.

In the above-described conventional structure, a small-sized and vertical plate-like bracket in the muffler is bolted to an end edge of a support plate that is fixedly coupled to a lateral side surface of the engine in a longitudinal posture, thereby supporting the muffler. In such a structure, the connection structure between the support plate and the muffler in the vertical posture does not have a sufficiently high support strength, and the vibration generated by the operation of the engine tends to loosen at the connection point between the support plate and the bracket in the vertical posture, and there is a possibility that the muffler cannot be maintained in a good support state for a long period of time.

Therefore, it is desired to support the muffler satisfactorily for a long period of time regardless of vibration of the engine.

In the above-described conventional structure, since the top end opening portion of the air release pipe provided in the starter motor is provided in a state of being directed toward the inside of the closed space provided laterally to the starter motor, rainwater, dirt scattered from the outside, or the like does not enter the inside of the closed space due to the cover plate, and there is little possibility that rainwater or dirt is erroneously sucked in from the top end opening portion of the air release pipe.

However, in the conventional construction, when the present invention is applied as a working machine to a paddy field working machine such as a rice seedling planting machine for performing paddy field work in a paddy field with a deep soil layer, there is a possibility that the machine body is buried in soil, the top end opening of the air release pipe is submerged by water, or the muddy water is strongly scattered, and water enters the inside of the starter motor.

Accordingly, it is desirable to provide a work machine that can reliably prevent moisture from entering 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 unit located at the front of the machine body comprises: a hood covering the outer periphery; an air cleaner positioned inside the hood,

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

A rear side air intake port for the air cleaner is formed in a portion of a rear side surface of the hood, which is opposite to the driver, above the driver's step and near the brake pedal,

a side-side air inlet connected to a rear-side air inlet formed on the rear side is formed on a lateral side of the hood,

a locking member is provided near the lateral side of the brake pedal, the locking member being capable of freely maintaining the position of the brake pedal in a stepping operation state or releasing the maintenance of the stepping operation state,

the side-side air intake is formed at a location proximate to the locking element,

a radiator for cooling the engine is arranged in the hood in a state that cooling air flows along the transverse width direction of the engine body,

an upper surface of a ventilation guide member located at an outer peripheral portion of the radiator and guiding cooling air is formed in a downward-forward inclined shape along an upper surface of the hood, an elastic sealing member is interposed between the upper surface of the ventilation guide member and the upper surface of the hood,

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

A shielding member for preventing the scattering of dirt from the running wheels is provided at the lower part of the radiator.

With this configuration, since the rear side air inlet for the air cleaner is formed in the rear side surface of the hood facing the driver and above the driver step, there is no concern that dirt or the like splashed from the traveling wheels during operation is scattered to the air inlet of the air cleaner and the air inlet is blocked, or there is no concern that the air inlet of the air cleaner is submerged in water and the air inlet is blocked when the operation is performed in a paddy field or the like, and the air cleaner can satisfactorily supply the combustion air.

Further, since the air cleaner has the brake pedal protruding upward from the driver's step, the rear side air intake to the air cleaner is formed in a position close to the brake pedal, and therefore, there are the following advantages.

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

When such preliminary seedlings are stacked on the steps of the driver's seat in large amounts, the rear side air inlet may be blocked by the preliminary seedlings. However, in this configuration, since the brake pedal is provided near the rear side intake side, a gap is formed between the preliminary run and the driver's step by the brake pedal, and the intake of the outside air from the side intake side can be performed satisfactorily without being hindered by the preliminary run. In addition, if the above-described stacked object is not stacked on the driver's step, the rear side air inlet is not blocked, so that the intake of the outside air from the side air inlet can be performed well.

Therefore, the air cleaner can satisfactorily supply the combustion air regardless of the operational conditions.

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

With this configuration, the position of the brake pedal is held in the step-in operation state by the lock member which is freely held and released in the position in the vicinity of the brake pedal, and the side portion side is formed in a position close to the lock member, so that the following advantage is obtained.

In the working vehicle, the work may be performed in a state where crops, fertilizers, chemicals, and the like planted on the land are stacked on the step of the driving part. As a working machine, in the case of a rice transplanter for transplanting seedlings into a paddy field, a prepared seedling for planting is sometimes stacked on a step of a driving part.

When such preliminary seedlings are stacked in large numbers, there is a possibility that the side air inlet is blocked by the preliminary seedlings. However, in this configuration, since the locking member is provided at a position close to the side-side air inlet, the brake pedal forms a gap between the preliminary vaccine and the driver's step, and thus the outside air can be satisfactorily introduced from the side-side air inlet without being obstructed by the preliminary vaccine.

With this structure, since the partition member is provided to partition the air intake passage portion of the radiator in the hood from the air intake portion of the air cleaner, the cooling air flowing along the air intake passage portion of the radiator and the combustion air flowing from the rear side air intake port and the side air intake port to the air cleaner can flow well while being partitioned by the partition member, and they do not affect each other.

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

With this configuration, the upper surface of the ventilation guide member, which is located at the outer peripheral portion of the radiator and guides the cooling air, is formed in a downward-forward inclined shape along the upper surface of the hood, and the elastic sealing 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 and forward, the operator can easily visually confirm the work area near the front side of the machine body when driving. Further, since the hood is provided to be swingable and openable for maintenance, and 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, the elastic closing member is acted upon by a pressing force in only the compression direction and not by a pressing force in the oblique direction in response to the opening and closing of the hood, and accordingly, there is no disadvantage such as friction loss, and durability of the elastic closing member can be improved.

With this structure, since the lower portion of the radiator has the shielding member, the phenomenon that dirt is scattered from the running wheel to the radiator as the work is running can be prevented, and the radiator is easily prevented from being blocked prematurely.

The 2 nd structural feature of the working machine of the present invention is that,

an upper surface of a ventilation guide member located at an outer peripheral portion of the radiator and guiding cooling air is formed in a downward-forward inclined shape along an upper surface of the hood, and an elastic sealing 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 locking member is provided near the brake pedal, the locking member being capable of freely maintaining the position of the brake pedal in a stepping operation state or releasing the maintenance of the stepping operation state,

the air cleaner includes a partition member that partitions an air intake path portion of the radiator and an air intake portion of the air cleaner.

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

the side-side inlet is formed at a location proximate to the locking member.

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

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

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

a rear side air intake port for the air cleaner is formed in a rear side surface of the hood, which is opposite to the driver, at a position above the driver's step and near the brake pedal.

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

the power unit located at the front of the machine body comprises: an engine and a muffler are provided, wherein the muffler is provided with a muffler,

The engine is carried and supported on the machine body frame through rubber supports which are respectively arranged at the left and right parts at the front and back,

an engine-side connecting member provided so as to extend transversely outward and connected to the engine across two rubber mounts located on the front side,

the muffler is supported by an outer extension of the engine side connecting member,

an exhaust pipe that guides exhaust gas from the engine to the muffler, the exhaust pipe being supported by the engine-side connecting member,

the muffler is arranged at one lateral side of the power unit in a posture of facing the front-back direction, and the exhaust port of the muffler is arranged at the rear side of the machine body and is formed to be opened downwards,

the engine is provided in a lateral posture in which an output shaft extends in a lateral width direction of the engine body.

With this structure, the engine is mounted and supported on the engine body frame by rubber mounts provided at four total positions of the left and right two positions, respectively, in the front and rear. An engine-side connecting member connected to the engine, the muffler being formed so as to extend laterally outward across rubber mounts located at two positions on a front side, and the muffler being supported by an outward extending portion of the engine-side connecting member.

Since the muffler is supported by the engine-side connecting member connected to the engine in this way, the engine and the muffler vibrate integrally, and there is less possibility that the connection portion of the exhaust pipe will crack or the like depending on the vibration modes of the engine and the muffler, as compared with a structure in which the muffler is supported on the body frame side, for example.

The engine-side connecting member is provided so as to extend across the rubber mount at two locations on the front side, and thus can stably support the muffler, and the outer extending portion is formed to extend outward from the lateral side, so that the shape of the outer extending portion is not restricted, and for example, the muffler can be stably and firmly supported by a structure for supporting and holding the muffler from the lower side. In addition, there are advantages in that: by using such an engine-side coupling member, the muffler can be provided at a lower position on the lateral side of the engine in the power unit, and the exhaust pipe can be shortened and the structure can be simplified when exhaust gas is discharged downward of the engine body.

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

With this 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 exhaust pipe is supported by the engine and the member integrally connected to the engine at the connecting portion of the engine to the muffler and at the intermediate portion therebetween, respectively, and therefore vibration of the exhaust pipe can be suppressed, and stable support can be achieved with less occurrence of cracking or the like.

With this structure, the muffler is disposed on one lateral side of the power unit in a posture facing in the front-rear direction, and the exhaust port is formed on the rear side of the engine body so as to open downward.

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

With this configuration, since the engine is disposed in a lateral posture in which the output shaft thereof extends in 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 working machine body, which is easily heavy at the rear portion due to the rear portion being connected to the working device, can be improved.

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

the muffler is disposed on one lateral side of the power unit in a posture facing in the front-rear direction, and an exhaust port of the muffler is formed on the rear side of the body and opens downward.

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

an exhaust pipe that guides exhaust gas from the engine to the muffler is supported by the engine-side connecting member.

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

the muffler is supported by an outer extension of the engine side connecting member.

The 11 th construction of the working machine of the invention is characterized in that,

The device comprises: a starter motor for starting an engine; and a bleed pipe for bleeding air from the starter motor,

the air release pipe is connected with the steering wheel column in a state that the top end part is opened to the inside of the steering wheel column,

the bleed line is set to the state: the intermediate portion located therebetween is located at a higher position than the connection portion to the starter motor and the connection portion to the steering column.

With this configuration, the air release pipe for releasing air from the starter motor is connected to the steering column with its tip end portion open to the inside of the steering column, and the steering column is formed in a tubular shape with the steering shaft inserted therein, and is formed long in the vertical direction. Further, since the upper side of the steering column is covered with the operation panel and the steering operation mechanism is connected to the lower side, there is little possibility that rainwater, dirt, or the like enters the steering column even if, for example, rainwater or cleaning water falls down or the body is submerged in a paddy field. As a result, clean air is always present inside the steering column.

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

With this configuration, since the intermediate portion located between the connection portion to the starter motor and the connection portion to the steering column of the air release pipe is located at a higher position than the connection portion to the starter motor, even if moisture enters the interior from the steering column side, it is difficult to pass over the higher position of the intermediate portion and transfer the moisture to the starter motor side, and the entry of moisture into the starter motor can be prevented.

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

the air release pipe is connected to the steering column with its tip end opened 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 top 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 section.

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

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 a state where the gas discharge pipe is arranged.

Symbol description

7. Engine with a motor

7a output shaft

8. Power unit

13. Driving part step

14. Driving part

17. Brake pedal

19. Locking piece

20. Hood cover

24. Steering wheel support

26. Radiator

28. Air filter

29. Silencer (muffler)

31. Starter motor

32. Rubber support

33. Frame of machine body

38. Engine side connecting member

42. External extension part

49. Exhaust pipe

54. Exhaust port

56. Ventilation guide member

63. Elastic closure member

73. Rear side air intake

74. Side-side air inlet

80. Air release pipe

S partition member

Q1 air intake path part

Q2 air inlet part

Detailed Description

Next, a case where an embodiment of the working machine of the present invention is applied to a riding 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 travel freely, and an eight-row planting type seedling planting device 6 is connected to the rear of the traveling body 3, and the seedling planting device 6 is lifted and lowered by a link mechanism 5 by an operation of a lifting cylinder 4.

A power unit for housing the engine 7 and a transmission case 9 for housing the transmission mechanism are disposed on the front side of the traveling machine body 3. In the center of the traveling machine body 3, a driver 14 is disposed, and the driver 14 is provided with a steering wheel 10, a driver seat 11, a shift lever 12, a driver step 13, and the like. Further, the traveling machine body 3 has a preliminary seedling stage 15 for stacking the preliminary seedlings for planting on both left and right sides of the front side.

The transmission case 9 has a hydrostatic continuously variable transmission 16, and the continuously variable transmission 16 is operated by a shift lever 12 to perform a continuously variable transmission operation freely in a forward/backward direction of the traveling body 3, and power from the engine 7 is shifted by the continuously variable transmission 16 and the shifted power is transmitted to the front wheels 1 and the rear wheels 2 to drive the traveling body. A brake pedal 17 for braking during traveling is provided at a right front portion of the driver seat 11 of the driver's seat 13.

As shown in fig. 6 and 7, the brake pedal 17 is configured to be able to be held in position in a brake application posture by a depression operation by a lock 19 provided in a position near the right side thereof. That is, when traveling is stopped during work, the position of the brake pedal 17 can be held in a braked state.

The lock 19 is swingably provided 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 the release position by a spring (not shown) (the state shown in fig. 6). When the brake pedal 17 is held in the braking state, the locking piece 19 is manually switched to the locking action position in the braking state in which the brake pedal 17 is depressed by the foot, and the locking concave portion 19a formed in the locking piece 19 is locked with the locking member 17a provided in the brake pedal 17, so that the brake pedal 17 can be held in position in the braking state.

The driving unit step 13 is provided so as to be located not only under the feet of the driver in the driving unit 14 but also to be connected to laterally outer portions of the left and right sides of the power unit 8, and is formed with a passage for up and down so that the driving unit 14 can be up and down from the front of the machine body.

The seedling planting device 6 is configured to have: a seedling placing table 6A for placing eight rows of seedlings for planting; a planting mechanism 6B for cutting a seedling from the lower part of the seedling placing table 6A and planting the seedling in the soil; and a land preparation float 6C for preparing the land, etc., and the seedling planting device 6 plants the seedlings into the land 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-rear side portion, and the lateral side portion of the power unit 8 are covered with the hood 20 disposed at the front portion of the traveling machine body 3. The hood 20 includes: a movable hood 21 covering a front portion of the power unit 8; and a stationary hood 22 covering a rear side portion of the power section 8. The upper portion of the movable hood 21 is formed in a downward-forward inclined shape that is positioned downward closer to the front side of the body.

The movable hood 21 is supported so as to be swingable about left and right axial cores located at an upper portion in the power unit 8, and is configured so as to be swingable to and from the fixed hood 22. A vent 23 for taking air into the power unit 8 is formed at both left and right side portions of the movable hood 21. The fixed hood 22 has inside: a steering column 24 that supports the steering wheel 10 in a rotatable tubular shape; and an operation connection mechanism 25 of the shift lever 12 that operates the continuously variable transmission 16.

The hood 20 of the power unit 8 has: 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 the exhaust gas from the engine 7 to the outside; a generator 30; and a starter motor 31 for engine starting.

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

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

The front side portion of the engine frame 33 has a pair of left and right front side mounting portions 34 which are directed downward as they approach the rear side, and the rear side portion of the engine frame 33 has a pair of left and right rear side mounting portions 35 which are directed downward as they approach the front side. The engine 7 is mounted and supported on the engine frame 33 in a state where vibration can be absorbed through the rubber mount 32 at four positions in total of the pair of left and right front side mounting portions 34 and the pair of left and right rear side mounting portions 35, respectively, and the rubber mount 32 is provided with connecting bolts 37 on the upper and lower sides of the vibration-proof rubber 36.

The support of the engine 7 with respect to the rubber mount 32 located at two positions on the front side is performed by the engine-side connecting member 38. 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 the front side and integrally connects the inclined mounting portion 39 connected to the rubber mount 32 at the front side, the longitudinal connecting portion 40 connected and fixed to the engine 7, the reinforcing rib 41 connecting them, and the like. 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 side portion of the rubber mount 32 at two left and right locations.

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

As shown in fig. 8 and 9, the engine-side connecting member 38 is integrally connected by bolts, and an outer extension 42 is formed so as to extend to the left and outer sides of the engine body. Further, a muffler support portion 43 for supporting the muffler 29 is formed on the outer extension portion 42 of the engine side connecting member 38. The muffler supporting portion 43 has an arcuate receiving and placing surface 44 for placing and supporting the muffler 29 having a cylindrical outer shape. The structure is as follows: the muffler 29 mounted on the receiving surface 44 is held by a substantially U-shaped pressing member 45. The pressing tool 45 has screw portions 46 formed at both end portions thereof, presses the muffler 29 from the upper side in a state of being placed on the receiving surface 44, and is fastened by nuts 48 from the lower side after the both end portions are inserted into insertion holes 47 formed at both left and right side portions of the receiving surface 44.

The exhaust portion 7b of the engine 7 and the muffler 29 are connected in communication to guide exhaust gas from the engine 7 to the exhaust pipe 49 of the muffler 29, and the exhaust pipe 49a formed on the engine side and the exhaust pipe 49b formed on the muffler 29 side are divided. 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. The flange 50 on the engine side is formed wider than the flange 51 on the muffler 29 side at a portion where the exhaust pipe 49a on the engine side and the exhaust pipe 49b on the muffler 29 side are connected by a flange, and the flange 50 on the engine side is connected and fixed to a support portion 52 integrally formed with the engine side connecting member 38 by bolts 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 the connection portion with the engine 7, the flange connection portion of the relay portion, and the connection portion with the muffler 29, respectively, and the exhaust pipe 49 can be supported in a state in which there is less possibility of cracking or the like due to the 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 that discharges 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 through which the exhaust gas is discharged to the outside is opened downward. Thus, the exhaust port 54 is opened downward, so that exhaust gas from the engine 7 is prevented from being discharged to the driving part 14 and the seedling planting device 6.

The radiator 26 is explained below.

As shown in fig. 4 and 5, a radiator 26 for cooling the engine 7 is disposed at the right side portion of the engine 7. The radiator 26 is received and fixed on its lower surface by a pair of brackets 55 provided on the engine frame 33. The radiator 26 is disposed in a posture in which a suction side surface of the heat exchange portion faces 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 peripheral portion of the radiator 26 and the outer peripheral portion of the cooling fan 27. The radiator cover 56 has a function as a fan shroud for guiding the cooling air flowing through the cooling fan 27 through the heat exchange portion, and is supported by fixing an appropriate portion to the radiator 26.

The cooling fan 27 is coupled to the output shaft 7a of the engine 7 by a transmission belt 57. The cooling fan 27 is driven by the power of the engine 7, and cooling air flowing from the ventilation opening 23 into the engine 7 through the radiator 26 is generated. The output shaft 7a of the engine 7 is coupled to the generator 30 by 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 front-side longitudinal portion 58 covering the front end surface of the radiator 26; an upper lateral portion 59 as an upper surface covering an upper face of the radiator 26; and a longitudinal portion 60 covering the rear side of the rear end surface of the radiator 26, and the radiator cover 56 has an air guide portion 62 for guiding the air, and the air guide portion 62 is connected to the inner side of the outer peripheral cover portion 61 and covers the outer peripheral portion of the cooling fan 27.

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

In this way, by forming the upper lateral portion 59 of the radiator cover 56 in a shape inclined forward and downward as in the case of the movable hood 21, only the force in the compression direction acts on the elastic closing member 63 when the movable hood 21 is opened and closed, and the elastic closing member 63 is in a state free from disadvantages such as frictional loss, so that abrasion of the elastic closing member 63 is reduced and durability is improved.

Between the longitudinal portion 60 on the rear side of the radiator cover 56 and the right side 22a of the fixed hood 22, there is an elastic closing member 63 made of a sponge material, the elastic closing member 63 separating two portions: an intake passage portion Q1 through which cooling air of the radiator 26 passes; and an intake portion Q2 of the air cleaner 28 located near the body rear side 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 in detail later.

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 in this portion is bonded and fixed to the radiator cover 56.

As shown in fig. 5 and 6, a shielding member 64 for preventing dirt from the front wheel 1, which is a traveling wheel, from scattering is provided at the lower portion of 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 bolting, and is set in an inclined posture that is positioned laterally outward as approaching the upper side. The shielding member 64 is constituted by a wide plate body, and is positioned between the front wheel 1 and the radiator 26 in a substantially vertical posture. By providing the shielding member 64, the earth and mud splashed from the front wheel 1 can be received, and the earth and mud can be prevented from scattering to the radiator 26.

At a front lower side portion of the shielding member 64, an inclined notch portion 65 is formed so as not to interfere when the front wheel 1 is steered. In addition, a gap is formed between the upper end edge 64a of the shielding member 64 and the driver's step 13. In this way, by providing a gap between the upper end edge 64a of the shielding member 64 and the driver's step 13, the assembly work is facilitated.

Next, the air cleaner 28 is explained.

The air cleaner 28 is disposed in a state of being located above and behind the engine 7. The air cleaner 28 is formed in a substantially cylindrical shape, and is supported in a lateral posture in which the axial direction is transverse by a member fixedly extending from a support portion 66 fixed to the body side of the steering column 24.

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

As shown in fig. 4, 6, and 7, a rear side air inlet 73 is formed in the rear surface 22b of the fixed hood 22 above the driver's step 13 for the air cleaner 28. In addition, a side-side air inlet 74 connected to the rear-side air inlet 73 is formed in the right side 22a of the fixed hood 22. That is, the rear side air inlet 73 and the side air inlet 74 are continuously connected, whereby a large air inlet 75 is formed at the corner of the stationary hood 22.

As shown in fig. 4, the intake pipe 72 of the air cleaner 28 is provided in such a state that: the intake opening 72a is provided so as to be close to a large intake port 75 formed in a corner portion of the fixed hood 22, and to face the large intake port 75. With this configuration, the air cleaner 28 can suck clean air on the upper side of the driver's seat 13 as combustion air.

As shown in fig. 7, the rear side air intake 73 is formed in a portion of the rear side 22b of the fixed hood 22 above the driver's step 13 and near the brake pedal 17. In this way, since the brake pedal 17 is provided in the vicinity of the rear side air inlet 73, even in the case where a large number of preliminary seedlings are stacked on the driver's step 13, the phenomenon that the rear side air inlet 73 is blocked by the stacked preliminary seedlings is easily avoided.

In addition, the side-side air inlet 74 is formed at a portion connected to the rear-side air inlet 73 and at a portion near the lock piece 19. In this way, since the locking piece 19 is provided in the vicinity of the side air inlet 74, even in the case where a large number of preliminary seedlings are stacked on the driver's step 13, the phenomenon that the side air inlet 74 is blocked by the stacked preliminary seedlings is easily avoided.

As shown in fig. 4, the intake opening 72a of the intake duct 72 of the air cleaner 28 is provided in a state of being opposed to each other in proximity to the large intake port 75, and the intake portion Q2 of such an air cleaner is located in a position close to the rear side with respect to the intake passage portion Q1 through which the cooling air of the radiator passes. Therefore, as described above, by providing the partition member S composed of the longitudinal portion 60 and the elastic closing member 63 on the rear side of the radiator cover 56, the cooling air flowing in the lateral 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 of being partitioned by the partition member S without affecting each other.

Next, the starter motor 31 will be described.

As shown in fig. 3 and 8, the starter motor 31 is disposed obliquely above and forward of 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 the outer peripheral portion of a flywheel 77 of the engine 7 and rotationally driving the pinion 79. After the engine 7 is started, the engagement between the pinion 79 and the ring gear 78 needs to be released, and therefore, the pinion 79 is slidingly operated by a solenoid, not shown, to be engaged with the ring gear 78 and disengaged from the ring gear.

Although not shown, since a gear mechanism for linking the starter motor 31 and the pinion 79 is incorporated, a slide operation portion including a solenoid and the pinion 79, and the starter motor 31 are integrally formed in a state in which the inside of the housing is communicated with each other. In order to prevent moisture from entering the inside, these housings are formed to be waterproof.

Since the starter motor 31 having such a closed structure is liable to be heated by operation, it is necessary to release heat to the outside, and when moisture is introduced, it is necessary to release moisture to the outside.

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

Other embodiments

(1) In the above embodiment, the structure is exemplified as follows: the lateral side of the brake pedal 17 has the locking member 19, and a side-intake 74 connected to the rear-side-intake 73 is formed on the lateral side 22b of the hood, but such a side-intake 74 may not be formed, but only the rear-side-intake 73.

(2) In the above embodiment, the following structure is made: the air cleaner 28 has a partition member S that partitions the air intake passage portion Q1 of the radiator 26 and the air intake portion Q2 of the air cleaner 28 in the hood 20, but may be configured without such a partition member S.

(3) In the above embodiment, the following structure is made: the upper surface of the radiator cover 56 is formed to be inclined forward and downward along the upper surface of the hood 20 in a forward and downward inclined shape, 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 lower portion of the radiator 26 has the shielding member 63, but may be configured without such a shielding member.

(5) In the above embodiment, the muffler 29 is supported by the outer extension 42 of the engine side connecting member 38, but instead of this, a plate-like frame for supporting the starter motor 31 may be provided in a longitudinal posture, which is provided on the side of the engine 7.

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

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

Industrial applicability

The invention is applicable to riding type rice transplanting machines or agricultural tractors and other working machines.

Claims

1. A working machine is characterized in that,

the muffler is supported from below by an outer extension of the engine side connecting member,

2. A working machine is characterized in that,