JP2015223871A - Riding type paddy working machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a riding type paddy working machine capable of providing a strength against a strong ground-contact reaction force to a machine body frame while avoiding or suppressing enlargement of the size of a main frame.SOLUTION: A rear wheel support device 50 includes: a pair of right and left swinging links 52 which are extended vertically swingably in the rear direction independently from a pair of right and left link support parts 55 disposed on a machine body and support a rear axle case 51 on the extension edge side; a suspension mechanism 54 which elastically supports the rear axle case 51; and a lateral mechanism 61 which regulates lateral movement of the rear axle case 51. A left side link support part 55 is connected over a left side main frame 22 and a left side reinforcement frame 23. A right side link support part 55 is connected over a right side main frame 22 and a right side reinforcement frame 23.

Description

  The present invention relates to a riding paddy field work machine.

Conventionally, there was a passenger rice transplanter disclosed in Patent Document 1. In this riding rice transplanter, the upper link as a swing link extends from the left and right brackets fixed to the pair of left and right main frames separately so as to be able to swing back and forth, and the extended ends of the left and right upper links A rear axle case is supported on the side. A suspension spring as a suspension mechanism is provided across an upper receiving portion fixed to each of the pair of left and right main frames and a bracket fixed to the rear axle case, a link mounting member provided on the main frame, A lateral rod is connected to the axle case.
Conventionally, as shown in Patent Document 2, there has been a riding type rice transplanter provided with a rear side step as a rear step located behind a driver seat.
Conventionally, as shown in Patent Document 3, a differential lock pedal is provided in a step provided in front of the driver's seat in the driver, and the differential lock operation and the differential lock release operation of the front wheel differential lock device are performed by the differential lock pedal. There was a riding rice transplanter.

JP 2009-179255 A JP 2013-203360 A JP2013-63021A

  When the above-described conventional rear wheel support device is employed, the ground reaction force transmitted to the swing link from the rear wheel via the rear axle case and the ground reaction force transmitted to the suspension spring as the suspension mechanism is applied. There is a problem that is strongly applied to the mainframe.

  Even if the rear step is provided so as to support the rear step at the peripheral portion, it is difficult to use the device if distortion is generated when a load is applied to the inner portion of the rear step. In particular, this problem is likely to occur when the lateral length of the rear step is long.

  When the operation step is provided with a differential lock pedal, when the operation step is removed, the pedal body supported by the tip of the pedal arm of the differential lock pedal passes through the pedal hole provided in the operation step. When it is necessary to remove the differential lock pedal, since the pedal body generally has a configuration in which the pedal body protrudes from the pedal arm to the periphery thereof, there is a problem that the operation step is easily caught around the pedal hole.

  It is an object of the present invention to provide a fuselage frame with strength against a strong ground reaction force while avoiding or suppressing an increase in size of the main frame, or to easily use a rear step, or to have a differential lock pedal. It is an object of the present invention to provide a riding-type paddy field work machine that can easily remove an operation step.

The riding paddy field machine according to the first invention is:
A pair of left and right front wheels are equipped on the front side of the aircraft,
A pair of left and right rear wheels are equipped via a rear wheel support device on the rear side of the aircraft,
The aircraft frame that the aircraft has is
A transmission case that is transmitted to the front wheels and the rear wheels;
A pair of left and right mainframes facing the front and rear sides, the front side of which is connected to the mission case;
A pair of left and right airframes in the front-rear direction in which a front end portion is connected to a portion below the portion to which the main frame of the transmission case is connected, and a rear end portion is separately connected to the rear side of the pair of left and right main frames. With reinforced frame,
The rear wheel support device includes:
A rear axle case for supporting the left and right pair of rear wheels;
A pair of left and right swing links that extend from the pair of left and right link support portions provided on the airframe so as to be swingable in the rearward direction separately, and support the rear axle case on the extended end side;
A suspension mechanism having an upper end connected to a suspension support provided in the airframe, a lower end connected to the rear axle case, and elastically supporting the rear axle case;
One end side is connected to the lateral support portion provided in the airframe, the other end side is connected to the rear axle case, and includes a lateral mechanism that restricts left and right movement of the rear axle case,
The left link support part is connected across the left main frame and the left reinforcing frame,
The right link support part is connected across the right main frame and the right reinforcing frame,
Each of the pair of left and right link support portions is positioned along the vertical direction of the fuselage, and a pair of left and right vertical plate portions through which a horizontal support shaft for supporting the swing link is inserted, and the pair of left and right tops A connecting plate portion that connects ends of the downward plate portion in the longitudinal direction of the machine body is provided, and is U-shaped when viewed from the vertical direction of the machine body.

  According to the configuration of the first invention, the main frame can be reinforced by the reinforcing frame. Further, the ground reaction force transmitted from the rear wheel to the link support portion via the rear axle case and the swing link can be distributed from the link support portion to the main frame and the reinforcing frame. Further, the link support portion includes a pair of left and right upward and downward plate portions through which the support shaft of the swing link is inserted, and a connecting plate portion that connects ends of the vertical and downward plate portions in the longitudinal direction of the body. Since it is U-shaped in view, the link support part can support the rocking link firmly against the ground reaction force, so it can resist strong ground reaction force simply by making the main frame strong Compared with providing the machine body with a predetermined rigidity, the machine body frame can be provided with the predetermined rigidity while avoiding or suppressing an increase in the size of the main frame.

  Therefore, according to the first aspect of the present invention, the riding paddy field work machine in which the rear wheel is supported by the suspension mechanism and the body frame has a predetermined rigidity and can be easily driven even in the paddy field can be avoided or suppressed. Can advantageously be obtained in terms of weight.

The riding paddy field work machine according to the second invention is:
A pair of left and right front wheels are equipped on the front side of the aircraft,
A pair of left and right rear wheels are equipped via a rear wheel support device on the rear side of the aircraft,
The aircraft frame that the aircraft has is
A transmission case that is transmitted to the front wheels and the rear wheels;
A pair of left and right mainframes facing the front and rear sides, the front side of which is connected to the mission case;
A pair of left and right airframes in the front-rear direction in which a front end portion is connected to a portion below the portion to which the main frame of the transmission case is connected, and a rear end portion is separately connected to the rear side of the pair of left and right main frames. With reinforced frame,
The rear wheel support device includes:
A rear axle case for supporting the left and right pair of rear wheels;
A pair of left and right swing links that extend from the pair of left and right link support portions provided on the airframe so as to be swingable in the rearward direction separately, and support the rear axle case on the extended end side;
A suspension mechanism having an upper end connected to a suspension support provided in the airframe, a lower end connected to the rear axle case, and elastically supporting the rear axle case;
One end side is connected to the lateral support portion provided in the airframe, the other end side is connected to the rear axle case, and includes a lateral mechanism that restricts left and right movement of the rear axle case,
The left link support part is connected across the left main frame and the left reinforcing frame,
The right link support portion is connected to the right main frame and the right reinforcing frame.

  According to the configuration of the second invention, the main frame can be reinforced by the reinforcing frame. Furthermore, the ground reaction force transmitted from the rear wheel to the link support part via the rear axle case and the swinging link can be distributed and acted from the link support part to the main frame and the reinforcing frame, so that the main frame is strengthened. Compared to providing the airframe with a predetermined rigidity that can resist a strong ground reaction force, the airframe can be provided with a predetermined rigidity while avoiding or suppressing an increase in the size of the main frame.

  Therefore, according to the second aspect of the present invention, a riding paddy field work machine in which the rear wheel is supported by the suspension mechanism and the body frame has a predetermined rigidity and can easily travel even in a paddy field can be avoided or suppressed. Can advantageously be obtained in terms of weight.

The riding paddy field work machine according to the third invention is
A pair of left and right front wheels are equipped on the front side of the aircraft,
A pair of left and right rear wheels are equipped via a rear wheel support device on the rear side of the aircraft,
A riding part is equipped on the rear side of the aircraft,
A rotation transmission shaft extending in the longitudinal direction of the aircraft that extends from the mission case toward the rear of the aircraft and is transmitted to the working device connected to the rear portion of the aircraft,
The aircraft frame that the aircraft has is
A pair of left and right mainframes facing the aircraft,
A pair of left and right riding part frame members that protrude from the pair of left and right main frames upward and separately form the riding part, and
A fuselage-side connection frame connected across the pair of left and right main frames,
The rear wheel support device includes:
A rear axle case for supporting the left and right pair of rear wheels;
A pair of left and right swing links that extend from the pair of left and right link support portions provided on the airframe so as to be swingable in the rearward direction separately, and support the rear axle case on the extended end side;
A pair of left and right suspension mechanisms, each having an upper end connected to a pair of left and right suspension support portions separately provided on the pair of left and right main frames, a lower end connected to the rear axle case, and elastically supporting the rear axle case; ,
One end side is connected to the lateral support portion provided in the airframe, the other end side is connected to the rear axle case, and includes a lateral mechanism that restricts left and right movement of the rear axle case,
The connecting frame is
Located between the pair of left and right main frames in the vertical direction of the body, the left end of the body is connected to the left main frame and the left suspension support, and the right end of the body is the right main frame and the right side. An up-and-down plate connected to the suspension support of
Extending rearward from the upper end of the up-and-down plate, the left side of the body is connected to the left main frame and the left riding frame member, and the right side of the body is the right main frame and the right frame. A front and rear facing plate portion connected to the right riding section frame member,
The rotational transmission shaft passes through a transmission shaft hole in the front-rear direction of the fuselage provided in a portion of the connection frame located between the pair of left and right main frames, and is positioned between a lower end and an upper end of the main frame. It passes through the position in the longitudinal direction of the aircraft.

  According to the configuration of the third aspect of the invention, the pair of left and right main frames are connected by the connection frame, and the connection frame protrudes from each of the pair of left and right main frames with respect to the suspension support portion provided on each of the pair of left and right main frames. Since it is also connected to the installed riding section frame member, the pair of left and right main frames are reinforced with each other via the connecting frame at a location adjacent to the portion that receives the ground reaction force from the suspension mechanism. And can be reinforced by the riding section frame member. The connecting frame includes a vertical plate connected to the main frame and the suspension support, and a longitudinal direction extending from the upper end of the vertical plate to the rear of the machine body and connected to the main frame and the riding frame member. Since the plate part is provided, the connection frame has a strong strength against the bending force in the vertical direction of the aircraft and the bending force in the longitudinal direction of the aircraft, and the reinforcement of the connection frame with respect to the main frame can be effectively performed. By strengthening the main frame, the main frame has a predetermined rigidity while avoiding or suppressing an increase in size of the main frame, compared to providing the main frame with a predetermined rigidity that can resist the ground reaction force from the suspension mechanism. It is provided with rigidity. That is, as compared with the case where the main frame is strengthened and the airframe is provided with the predetermined rigidity, the airframe is provided with the predetermined rigidity while avoiding or suppressing the enlargement of the main frame.

  The rotation transmission shaft passes through a transmission shaft hole in the longitudinal direction of the machine body provided in a portion located between the pair of left and right main frames of the connection frame, and the height position between the lower end and the upper end of the main frame is set to the machine body. Since it passes in the front-rear direction, the ground height of the rotary transmission shaft can be increased compared to passing through a position lower than the lower end of the main frame, and mud adhesion on the rotary transmission shaft can be easily avoided.

  Therefore, according to the third aspect of the invention, a riding paddy field work machine in which the rear wheels are supported by the suspension mechanism and the body frame has a predetermined rigidity and can be easily driven even in paddy fields can be avoided or suppressed. Can advantageously be obtained in terms of weight. Although it is equipped with a connecting frame, troubles such as rust due to mud adhesion on the rotary transmission shaft hardly occur.

The riding paddy field work machine according to the fourth invention is:
A pair of left and right front wheels are equipped on the front side of the aircraft,
A pair of left and right rear wheels are equipped via a rear wheel support device on the rear side of the aircraft,
A riding part is equipped on the rear side of the aircraft,
The aircraft frame that the aircraft has is
A pair of left and right mainframes facing the aircraft,
A pair of left and right riding part frame members that protrude from the pair of left and right main frames upward and separately form the riding part, and
A fuselage-side connection frame connected across the pair of left and right main frames,
The rear wheel support device includes:
A rear axle case for supporting the left and right pair of rear wheels;
A pair of left and right swing links that extend from the pair of left and right link support portions provided on the airframe so as to be swingable in the rearward direction separately, and support the rear axle case on the extended end side;
A pair of left and right suspension mechanisms, each having an upper end connected to a pair of left and right suspension support portions separately provided on the pair of left and right main frames, a lower end connected to the rear axle case, and elastically supporting the rear axle case; ,
One end side is connected to the lateral support portion provided in the airframe, the other end side is connected to the rear axle case, and includes a lateral mechanism that restricts left and right movement of the rear axle case,
The connecting frame is
Located between the pair of left and right main frames in the vertical direction of the body, the left end of the body is connected to the left main frame and the left suspension support, and the right end of the body is the right main frame and the right side. An up-and-down plate connected to the suspension support of
Extending rearward from the upper end of the up-and-down plate, the left side of the body is connected to the left main frame and the left riding frame member, and the right side of the body is the right main frame and the right frame. And a front-rear facing plate portion connected to the right riding portion frame member.

  According to the configuration of the fourth aspect of the invention, the pair of left and right main frames are connected by the connection frame, and the connection frame protrudes from each of the pair of left and right main frames with respect to the suspension support portion provided on each of the pair of left and right main frames. Since it is also connected to the installed riding section frame member, the pair of left and right main frames are reinforced with each other via the connecting frame at a location adjacent to the portion that receives the ground reaction force from the suspension mechanism. And can be reinforced by the riding section frame member. The connecting frame includes a vertical plate connected to the main frame and the suspension support, and a longitudinal direction extending from the upper end of the vertical plate to the rear of the machine body and connected to the main frame and the riding frame member. Since the plate part is provided, the connection frame has a strong strength against the bending force in the vertical direction of the aircraft and the bending force in the longitudinal direction of the aircraft, and the reinforcement of the connection frame with respect to the main frame can be effectively performed. By strengthening the main frame, the main frame has a predetermined rigidity while avoiding or suppressing an increase in size of the main frame, compared to providing the main frame with a predetermined rigidity that can resist the ground reaction force from the suspension mechanism. It is provided with rigidity. That is, as compared with the case where the main frame is strengthened and the airframe is provided with the predetermined rigidity, the airframe is provided with the predetermined rigidity while avoiding or suppressing the enlargement of the main frame.

  Therefore, according to the fourth aspect of the present invention, a riding paddy field work machine in which the rear wheel is supported by the suspension mechanism and the body frame has a predetermined rigidity and can be easily driven even in a paddy field can be avoided or suppressed. Can advantageously be obtained in terms of weight.

The riding paddy field work machine according to the fifth invention is
A pair of left and right front wheels are equipped on the front side of the aircraft,
A pair of left and right rear wheels are equipped via a rear wheel support device on the rear side of the aircraft,
A riding part is equipped on the rear side of the aircraft,
The aircraft frame that the aircraft has is
A pair of left and right mainframes facing the aircraft,
A pair of left and right riding part frame members that protrude from the pair of left and right main frames upward and separately form the riding part, and
A fuselage-side connection frame connected across the pair of left and right main frames,
The rear wheel support device includes:
A rear axle case for supporting the left and right pair of rear wheels;
A pair of left and right swing links that extend from the pair of left and right link support portions provided on the airframe so as to be swingable in the rearward direction separately, and support the rear axle case on the extended end side;
A pair of left and right suspension mechanisms, each having an upper end connected to a pair of left and right suspension support portions separately provided on the pair of left and right main frames, a lower end connected to the rear axle case, and elastically supporting the rear axle case; ,
One end side is connected to the lateral support portion provided in the airframe, the other end side is connected to the rear axle case, and includes a lateral mechanism that restricts left and right movement of the rear axle case,
The left side of the body of the connection frame is connected to the left suspension support part and the left riding part frame member,
The right side portion of the connecting frame is connected to the right suspension support portion and the right riding portion frame member.

  According to the configuration of the fifth aspect of the invention, the pair of left and right main frames are coupled by the coupling frame, and the coupling frame protrudes from each of the pair of left and right main frames with respect to the suspension support portion provided on each of the pair of left and right main frames. Since it is also connected to the installed riding section frame member, the pair of left and right main frames are reinforced with each other via the connecting frame at a location adjacent to the portion that receives the ground reaction force from the suspension mechanism. Compared with providing the main frame with a predetermined rigidity that can resist the ground reaction force from the suspension mechanism by strengthening the main frame, and can be reinforced by the riding section frame member. Predetermined rigidity for the main frame while avoiding and suppressing the increase in size of the main frame Provoking. That is, as compared with the case where the main frame is strengthened and the airframe is provided with the predetermined rigidity, the airframe is provided with the predetermined rigidity while avoiding or suppressing the enlargement of the main frame.

  Therefore, according to the fifth aspect of the present invention, a riding type paddy field work machine in which the rear wheel is supported by the suspension mechanism and the body frame has a predetermined rigidity and can easily travel even in a paddy field can be avoided or suppressed. Can advantageously be obtained in terms of weight.

The riding paddy field work machine according to the sixth invention is:
A pair of left and right front wheels are equipped on the front side of the aircraft,
A pair of left and right rear wheels are equipped on the rear side of the aircraft,
A riding part having a rear step located behind the driver's seat on the rear side of the aircraft is equipped,
The aircraft frame that the aircraft has is
A pair of left and right mainframes facing the aircraft,
A riding section frame disposed above the pair of left and right main frames,
The riding section frame is
A pair of left and right airframe front and rear frame frames arranged above the pair of left and right main frames;
The left side of the fuselage is positioned on the left side of the left side of the fuselage with respect to the left frame and the right side of the fuselage is positioned on the right side of the right side of the frame with respect to the right side of the frame. A front step frame that is supported and receives and supports the rear step from below;
The left side of the fuselage is positioned on the left side of the left side of the fuselage with respect to the left side frame, and the right side of the side of the fuselage is positioned on the right side of the right side with respect to the right side of the frame. And a rear step frame facing the fuselage for receiving and supporting the rear step from below,
The front step frame is a member that is continuous from the left end of the body to the right end of the body, and is configured by a U-shaped member that has a longitudinal sectional shape that opens toward the rear of the body.
The rear step frame is configured by a tubular member that extends from the left end of the body to the right end of the body.

According to the configuration of the sixth aspect of the invention, the front step frame is supported on the front side of the rear step while the front step frame is continuously received and supported over a wide range in the lateral direction on the front side of the rear step. Can be made. In addition, the rear step frame can be supported on the rear side of the rear step with the rear step frame continuously received and supported over a wide range in the lateral direction on the rear side of the rear step. The rear step can be firmly supported so that distortion is unlikely to occur on either the edge side or the inside.
The front step frame is configured by a U-shaped member whose longitudinal cross-section is open toward the rear of the machine body, and the rear step frame is configured by a tubular member, so that the front step frame and the rear frame are compared with a solid member. A step frame can be obtained lightly.
That is, the rear step can be supported by a lightweight frame structure in a state in which it is difficult to be distorted on both the peripheral side and the inner side.

Therefore, according to the sixth aspect of the present invention, it is possible to equip the rear step which is difficult to be distorted and easy to use while reducing the weight of the body by reducing the weight of the frame structure.
In addition, since the vertical cross-sectional shape of the front step frame is a U-shape that opens toward the rear of the aircraft, the vertical side portion of the front step frame is positioned on the front side of the aircraft with respect to the front and rear side portions, In order to support a front member such as a fuel tank located on the front side of the machine body of the step frame on the front step frame, the front member can be easily applied to the side portion in the vertical direction and can be easily connected to the front step frame.

The riding paddy field work machine according to the seventh invention is
A pair of left and right front wheels are equipped on the front side of the aircraft,
A pair of left and right rear wheels are equipped on the rear side of the aircraft,
A riding part having a rear step located behind the driver's seat on the rear side of the aircraft is equipped,
The aircraft frame that the aircraft has is
A pair of left and right mainframes facing the aircraft,
A riding section frame disposed above the pair of left and right main frames,
The riding section frame is
A pair of left and right airframe front and rear frame frames arranged above the pair of left and right main frames;
The left side of the fuselage is positioned on the left side of the left side of the fuselage with respect to the left frame and the right side of the fuselage is positioned on the right side of the right side of the frame with respect to the right side of the frame. A front step frame that is supported and receives and supports the rear step from below;
The left side of the fuselage is positioned on the left side of the left side of the fuselage with respect to the left side frame, and the right side of the side of the fuselage is positioned on the right side of the right side with respect to the right side of the frame. And a rear step frame facing the fuselage for receiving and supporting the rear step from below,
The front step frame and the rear step frame are configured by members that are continuous from the left end of the body to the right end of the body.

  According to the configuration of the seventh aspect of the invention, the front step frame is supported on the front side of the rear step while the front step frame continuously receives and supports a wide range in the lateral direction of the airframe on the front side of the rear step. Can be made. In addition, the rear step frame can be supported on the rear side of the rear step with the rear step frame continuously received and supported over a wide range in the lateral direction on the rear side of the rear step. The rear step can be firmly supported so that distortion is unlikely to occur on either the edge side or the inside.

  Therefore, according to the seventh aspect of the present invention, it is possible to equip the rear step which is not easily distorted and easy to use.

The riding paddy field work machine according to the eighth invention is:
A pair of left and right front wheels are equipped on the front side of the aircraft,
A pair of left and right rear wheels are equipped on the rear side of the aircraft,
A riding section having a driver's seat and a driving step is equipped on the rear side of the aircraft,
The driving step is provided with a differential lock pedal for switching the pair of left and right front wheels between a differential lock state and a differential lock release state,
The differential lock pedal is
A lower end side is supported below the operation step, and an upper end side protrudes above the operation step from a pedal hole provided in the operation step, and a pedal arm,
A pedal body that is detachably supported by the pedal arm above the operation step.

  According to the configuration of the eighth aspect of the invention, by removing the pedal body from the pedal arm, the pedal body that protrudes around the pedal arm can be eliminated from the route for taking out the driving step. Compared to the removal, the operation step can be removed without the need for attention and operation to avoid the operation step being caught on the pedal body.

  Therefore, according to the eighth aspect of the invention, when performing an operation such as inspection or repair below the operation step, the operation step can be easily and quickly performed without requiring attention or operation to avoid the operation step being caught on the pedal body. Remove and work efficiently.

It is a side view showing the whole riding type rice transplanter. It is a top view which shows the whole riding type rice transplanter. It is a side view which shows a body frame and a rear-wheel support apparatus. It is a top view which shows a body frame and a rear-wheel support apparatus. It is a perspective view which shows a riding part frame. It is a rear view which shows the support structure and differential lock pedal of a lower rocking | fluctuation link. It is a rear view which shows the support structure of an upper rocking | fluctuation link. It is a perspective view which shows a link support part. It is a rear view which shows a connection frame and a lateral rod. It is a front view which shows the support structure and connection frame of a rear axle case. It is a vertical side view of a connection frame.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a side view showing an entire riding type rice transplanter as an example of a riding type paddy field working machine according to an embodiment of the present invention. FIG. 2 is a plan view showing the entirety of the riding type rice transplanter as an example of the riding type paddy field working machine according to the embodiment of the present invention.

  As shown in FIGS. 1 and 2, the riding type rice transplanter is equipped with a pair of left and right front wheels 1 and 1 on the front side so as to be driven and steerable, and a pair of left and right rear wheels 2 on the rear side. , 2 are equipped with an airframe that can be driven. A prime mover 3 having an engine 3a is provided on the front side of the airframe, and the airframe is self-propelled so that the front wheels 1 and the rear wheels 2 are driven by the driving force from the engine 3a and are self-propelled. It is configured. On the rear side of the fuselage, there is provided a riding section 7 having a driver's seat 4, a steering handle 5 for steering the front wheel 1 and a driving step 6, so that the fuselage rides on the riding section 7 and steers it. It is configured as a passenger type. A seedling planting device 10 having six seedling mechanisms 11 arranged in the lateral direction of the machine body is connected to the rear part of the machine body.

  On the front side of the machine body, a pair of left and right reserve seedling storage devices 8 are provided in a distributed manner on both lateral sides of the prime mover 3. On the rear side of the airframe, the mat-like seedlings, which are placed from both sides of the driver's seat 4 on the side of the driver's seat 4 and the rear side of the boarding portion 7 and rearward, are taken out from the reserve seedling storage device 8. A rear step 9 used mainly for seedling supply work to be supplied to the seedling table 12 is provided.

  The seedling planting device 10 is supported by an extended end portion of a link mechanism 15 that is extended from the machine body to the rear side so as to be able to swing up and down, and the link mechanism 15 is swing-operated by an elevating cylinder 16 that is a hydraulic cylinder. As a result, a plurality of grounding floats 13 that are arranged in the lower part of the seedling planting device 10 in the horizontal direction of the seedling are lowered to the field scene and come into contact with the lowering state, and the grounding float 13 is raised higher than the field scene. It is designed to be moved up and down in the working state.

  The riding type rice transplanter performs a seedling planting operation in which eight seedlings can be planted by the seedling planting device 10 by lowering the seedling planting device 10 to a lowering operation state and running the machine body.

The airframe frame 20 provided in the airframe will be described.
As shown in FIGS. 1, 3, and 4, the fuselage frame 20 includes a mission case 21 located on the front side of the fuselage, and a pair of left and right support members mounted on the rear portion of the mission case 21. A pair of left and right mainframes 22, 22 facing the front and rear of the pair of left and right mainframes 22, and a rear portion of the pair of left and right mainframes 22, each having a front end connected to the support 21 a and extending from the mission case 21 toward the rear of the body And a riding section frame 30 projecting upward from the side.

  In the left support portion 21a of the mission case 21, a left-side reinforcing frame 23 is connected to a portion below the portion to which the main frame 22 is connected and to the rear side of the left main frame 22. is there. A reinforcing frame 23 on the right side of the vehicle body is connected to a portion of the right side support portion 21a of the mission case 21 that is lower than the portion to which the main frame 22 is connected and the rear side of the right main frame 22. is there. Each of the left and right reinforcing frames 23 includes a front side portion 23a extending in parallel or substantially in parallel with the main frame 22 from a portion connected to the support portion 21a of the mission case 21 in a side view of the mission case 21, and the front side portion 23a. A rear side portion 23b extending rearward and upward from the rear end and connected to the rear side of the main frame 22 is provided.

  The left and right main frames 22 are constituted by steel pipe members having a rectangular longitudinal section. The left and right reinforcing frames 23 are constituted by steel pipe members having a circular longitudinal cross-sectional shape.

  A laterally connecting frame 24 is connected across the rear side of the left main frame 22 and the rear side of the right main frame 22. The left side end of the frame of the connecting frame 24 projects from the left main frame 22 to a suspension support portion 25 provided with a support member, and the left main frame 22 upwards from the left side of the fuselage. Is connected to a column member 31 as a left riding section frame member. The end of the connecting frame 24 on the right side of the fuselage protrudes upward from the left main frame 22 and the suspension support portion 25 provided by attaching a support member to the right main frame 22, and the riding section frame. 30 is connected to a strut member 31 as a right riding portion frame member constituting 30.

The connection frame 24 will be described in detail.
FIG. 11 is a vertical side view of the connection frame 24. As shown in FIGS. 3, 4, and 11, the connecting frame 24 includes a vertical plate portion 24 a that is positioned between the left and right main frames 22 along the vertical direction of the machine body, and a rear side from the upper end portion of the vertical plate part 24 a. And a front / rear facing plate portion 24b extending in the direction.

  The left side end of the body 24a of the up-and-down plate 24a is located at the rear side of the inner portion of the suspension support 25 provided on the left main frame 22 and located on the inner side of the body side of the main frame 22 and the left main frame 22a. It is connected to the inner side surface of the frame 22. The right side end of the body of the up-and-down plate portion 24a is a rear side portion of an inner portion located on the inner side of the body of the right suspension support portion 25 provided on the right main frame 22 with respect to the right side of the body. The main frame 22 is connected to the inner side surface portion. The connection of the vertical plate 24a to the main frame 22 and the suspension support 25 at the left end and the right end of the airframe is performed by welding.

  The left end of the machine body of the front / rear facing plate portion 24 b is connected to a column member 31 protruding from the left main frame 22 and a side surface portion inside the left main frame 22. The right side end of the body of the front / rear facing plate portion 24 b is connected to a column member 31 protruding from the right main frame 22 and a side surface portion inside the right main frame 22. The front and rear facing plate portions 24b are connected to the main frame 22 and the column member 31 at the left end and the right end of the body by welding.

  As shown in FIGS. 9 and 10, a pair of transmission shaft holes 26, 27 facing in the longitudinal direction of the airframe are provided in a portion of the connecting frame 24 positioned between the left and right main frames 22. One transmission shaft hole 26 extends rearward from the mission case 21, and transmits a driving force output from a work mission (not shown) accommodated in the mission case 21 to the seedling planting device 10. The rotation transmission shaft 28 (see FIGS. 3 and 4) facing forward and backward is configured to pass. The height at which the transmission shaft hole 26 is located, the rotational transmission shaft 28 passes through the height position between the lower end and the upper end of the main frame 22 in the longitudinal direction of the body, and the rotational transmission shaft 28 is viewed from the side of the body. It is set to the height that is located at the height where it overlaps. A bearing portion 29 that supports the rotation transmission shaft 28 so as to be relatively rotatable is provided at the rear portion of the connection frame 24.

  The other transmission shaft hole 27 is for passing a rotary transmission shaft that is transmitted from the mission case 21 to the fertilizer when a fertilizer (not shown) is provided at the rear of the machine body. The transmission shaft hole 26 is located at a central portion of the connection frame 24 in the lateral direction of the machine body, and the transmission shaft hole 27 is located near a lateral end of the connection frame 24.

The support structure of the front wheel 1 will be described.
As shown in FIGS. 1, 3, and 4, a front wheel drive case 40 extends outward from the left lateral side and right lateral side of the mission case 21, and the extension ends of the left and right front wheel drive cases 40 respectively. A front wheel support case 41 (see FIG. 1) that supports the front axle so as to be able to drive and rotate is supported by the portion so as to be swingable around a steering shaft center that is directed upward and downward. The frame 20 is supported so that it can be steered and driven.

  That is, the left and right front wheels 1 are respectively supported by the transmission case 21 via the front wheel support case 41 and the front wheel drive case 40, and the steering wheel 5 is rotated, whereby the front wheel support case 41 is rotated around the steering axis. When the front wheel drive case 40 is swung, the steering operation is performed around the steering axis.

  Each of the left and right front wheels 1 is input to the transmission case 21 from the engine 3 a, and the front wheel driving force output from the traveling mission (not shown) stored in the transmission case 21 is stored in the front wheel driving case 40. It is driven by being transmitted to the front axle via the rotation transmission shaft 42 (see FIG. 3) and a gear transmission mechanism (not shown) accommodated in the front wheel support case 41.

A support structure for the rear wheel 2 will be described.
As shown in FIGS. 3 and 4, a rear axle case 51 that supports the pair of left and right rear wheels 2 so as to be rotationally driven via the rear axle 2 a, and the left and right sides connected to the front side of the rear axle case 51. A pair of upper swing links 52, 52, a pair of left and right lower swing links 53, 53 connected to the front side of the rear axle case 51, and the front side of the rear axle case 51 A rear wheel support device 50 having a suspension spring 54 as a pair of left and right suspension mechanisms connected at the lower end side is provided in the body frame 20, and the pair of left and right rear wheels 2 are supported by the body frame 20 so as to be movable up and down. In addition, it is supported elastically and is drivably supported.

  That is, as shown in FIGS. 3, 4, and 7, the front boss portion 52 a provided at the front end portion of the left upper swing link 52 is connected across the left main frame 22 and the left reinforcing frame 23. It is connected to the left link support portion 55 via a support shaft 56 facing the airframe so as to be relatively rotatable. As shown in FIGS. 3 and 10, a rear boss portion 52 b provided at the rear end portion of the left upper swing link 52 is provided with a pair of left and right support members attached to the front portion of the rear axle case 51. The left and right support portions 51a of the pair of left and right support portions 51a are coupled to the upper end side of the left support portion 51a via a support shaft 57 facing the machine body so as to be relatively rotatable.

  A front boss portion 52a provided at the front end portion of the right upper swing link 52 is connected to the right link support portion 55 that is connected to the right main frame 22 and the right reinforcing frame 23 so as to support the transverse shaft 56. It is connected so that relative rotation is possible. A rear boss portion 52b provided at the rear end portion of the right upper swing link 52 has a lateral support shaft on the upper end side of the right support portion 51a of the pair of left and right support portions 51a of the rear axle case 51. 57 is connected to be relatively rotatable.

  Accordingly, the pair of left and right upper swing links 52 are extended from the left and right link support portions 55 to the rear of the body separately so as to be able to swing up and down using the left and right axis of the support shaft 56 as the swing axis. Thus, the upper end side of the rear axle case 51 is supported by the extending end side, and the rear axle case 51 can be raised and lowered with respect to the body frame 20, and the left and right rear wheels 2 can be raised and lowered with respect to the body frame 20.

  Each of the left and right link support portions 55 is connected to the rear side portion 23 b of the reinforcing frame 23 in a back-up inclined state. That is, as shown in FIG. 3, the arrangement relationship of the main frame 22, the link support portion 55, and the rear side portion 23 b of the reinforcement frame 23 is an arrangement relationship that forms a triangle in a side view of the body. The left and right upper swing links 52 are made of steel pipes having a rectangular cross section.

  As shown in FIGS. 3, 4, 7, and 8, the left and right link support portions 55 are positioned along the vertical direction of the aircraft at locations spaced apart in the horizontal direction of the aircraft, and a pair of left and right through which the support shaft 56 is inserted. A vertical plate portion 55a and a connecting plate portion 55b for connecting the front end of the pair of left and right vertical plate portions 55a are provided, and the shape of each of the left and right link support portions 55 in the vertical direction of the fuselage is shown. It has a U-shape that opens backward.

  In each of the left and right link support portions 55, the link support portion 55 is connected to the upper end 55U of the vertical plate portion 55a on the laterally outer side of the pair of left and right vertical plate portions 55a. The upper end of the vertical plate 55a on the laterally outer side of the fuselage is connected to the laterally outward surface of the main frame 22 and connected to the vertical plate 55a on the laterally inner side of the machine. The upper end of the plate part 55b is connected to the downward surface of the main frame 22 and connected. A cylindrical body constituting a boss portion 55c through which the end portion of the support shaft 56 is inserted is provided between the left and right upward and downward plate portions 55a.

  The left and right link support portions 55 are coupled to the support shaft 56 of the left and right upper swing links 52 by a single support shaft 56.

  As shown in FIGS. 3 and 6, a front boss portion 53 a provided at the front end portion of the left lower swinging link 53 is a support shaft that faces the left and right sides of the body at the lower end side of the left support portion 21 a of the mission case 21. It is supported via 58 so as to be relatively rotatable. As shown in FIGS. 3 and 10, the rear boss portion 53 b provided at the rear end portion of the left lower swing link 53 is directed to the left and right sides of the left support portion 51 a of the rear axle case 51. It is supported via a support shaft 59 so as to be relatively rotatable.

  As shown in FIGS. 3 and 6, a front boss portion 53 a provided at the front end portion of the right lower swinging link 53 is a left and right support shaft on the lower end side of the right support portion 21 a of the mission case 21. It is supported via 58 so as to be relatively rotatable. As shown in FIGS. 3 and 10, the rear boss portion 53 b provided at the rear end portion of the right lower swing link 53 faces the lower end side of the right support portion 51 a of the rear axle case 51 in the left-right direction of the fuselage. It is supported via a support shaft 59 so as to be relatively rotatable.

  Accordingly, the pair of left and right lower swing links 53 are extended from the transmission case 21 so as to be vertically swingable from the mission case 21 toward the rear of the body, with the left and right axis of the support shaft 58 as the swing axis. The lower end side of the rear axle case 51 is supported by the exit end side, and the rear axle case 51 can be raised and lowered with respect to the body frame 20, and the left and right rear wheels 2 can be raised and lowered with respect to the body frame 20.

  The left and right upper rocking links 52 and the left and right lower rocking links 53 are made of steel pipes having a rectangular cross section.

  The left and right support portions 51a of the rear axle case 51 are located between the left axle support portion 51b and the right axle support portion 51b in the rear axle case 51, and the input driving force is transferred to the left and right axle support portions. It is provided in the distribution transmission part 51c which distributes and transmits to 51b.

  As shown in FIG. 10, the upper end side of the left suspension spring 54 is connected to a suspension support portion 25 provided on the left main frame 22, and the lower end side of the left suspension spring 54 is connected to the left side of the rear axle case 51. The support portion 51a is connected to a suspension support portion 51d on the axle case side that is supported via a support shaft 59 so as to be relatively rotatable.

  The upper end side of the right suspension spring 54 is connected to a suspension support portion 25 provided on the right main frame 22, and the lower end side of the right suspension spring 54 is a support shaft on the right support portion 51 a of the rear axle case 51. A suspension support portion 51d on the axle case side that is supported so as to be relatively rotatable via 59.

  Accordingly, the left and right suspension springs 54 elastically support the rear axle case 51 with the main frame 22 as a reaction member, and thereby elastically support the pair of left and right rear wheels 2.

  The left and right rear wheels 2 are provided with a rotary transmission shaft 60 (rear wheel drive shaft 60) in which a rear wheel driving force output from a traveling mission (not shown) housed in the mission case 21 extends from the mission case 21 toward the rear of the aircraft. 1 and 3) is input to the distribution transmission portion 51c of the rear axle case 51, and is distributed and transmitted from the distribution transmission portion 51c to the left and right axle support portions 51b to be transmitted to the rear axle 2a. .

  As shown in FIG. 3, the rear wheel support device 50 is disposed opposite to the side where the upper swing link 52 and the lower swing link 53 are located with respect to the rear axle case 51, and the rear wheel 2. A lateral rod 61 is provided as a lateral mechanism for restricting the left-right movement of the lens.

  As shown in FIG. 9, one end side of the lateral rod 61 is supported by a lateral support portion 63 on the airframe side, which is a stay extending downward from the rear end portion of one main frame 22, and a fulcrum shaft 64 facing in the longitudinal direction of the airframe. It is connected so that relative rotation is possible. The other end of the lateral rod 61 is connected to a longitudinally supporting fulcrum shaft 62 as a lateral support portion provided at a rear portion of the distribution transmission portion 51c of the rear axle case 51 so as to be relatively rotatable.

  The lateral rod 65 enables the rear axle case 51 to move up and down by swinging with respect to the rear axle case 51 and the lateral support portion 63, and pulls and pushes the rear axle case 51 with the lateral support portion 63 as a reaction member. Thus, the left and right movement of the rear axle case 51 is restricted, and thereby the right and left movement of the rear wheel 2 is restricted.

The riding section frame 30 will be described.
As shown in FIGS. 3, 5, and 6, the airframe frame 20 includes a riding section frame 30 that protrudes upward from the rear side of the pair of left and right main frames 22. 7 forms a rear portion where the driver's seat 4 and the rear step 9 are located.

  In other words, the riding section frame 30 protrudes upward from the pair of left and right main frames 22 upward and separately from the pair of left and right main frames 22, and is located above the front side of the upper swing link 52. The seat support member 33 is provided on the pair of left and right seat support columns 32, and the driver seat 4 is supported by the seat support member 33.

  The seat support member 33 includes a pair of left and right support portions 33a that rotatably support the front end side of the driver seat 4 via a fulcrum shaft that faces the fuselage, and the driver seat 4 can swing up and down around the fulcrum shaft. It is configured to support.

  The riding section frame 30 is installed on a pair of left and right strut members 31 projecting upward from the rear side of the pair of left and right main frames 22, a left seat strut section 32, and a left strut member 31. It is installed above the left main frame 22 on the left body frame 34 that is parallel or substantially parallel to the left main frame 22, and on the right seat support 32 and the right support member 31. Above the right main frame 22 is a front frame 34 that faces the front and back of the right aircraft that is parallel or substantially parallel to the right main frame 22, and a front step frame that faces the front of the left and right platform frames 34. 35, and a rear step frame 36 facing the fuselage that is installed on the rear side of the left and right base frames 34, and includes a front step frame 35 and a rear step frame 36. Have configured rear step 9 to support receiving from below Te. The rear step frame 36 is configured such that the rear step 9 is fixed by connecting the rear step 9 to a plurality of brackets 36 a provided at the rear portion via a connecting bolt.

  The lengths of the front step frame 35 and the rear step frame 36 in the lateral direction of the aircraft are such that the left end of the aircraft is located on the left lateral outer side of the left frame with respect to the left base frame 34, and the right end of the aircraft is on the right side of the aircraft with respect to the right base frame 34. The length is located on the laterally outer side, and the lengths are set so that both ends of the front step frame 35 and the rear step frame 36 are slightly located inside the lateral side of the aircraft from the lateral side end of the rear step 9. It is. The front step frame 35 is configured by a U-shaped channel member whose longitudinal cross-sectional shape is open toward the rear of the machine body. The rear step frame 36 is constituted by a tubular member. Specifically, the rear step frame 36 is constituted by a steel pipe member having a rectangular longitudinal cross-sectional shape.

  A portion of the front step frame 35 and the rear step frame 36 that is located on the lateral outer side of the left base frame 34 is received and supported from below by a rear portion 38b of the left side step frame 38. is there. A portion of the front step frame 35 and the rear step frame 36 located on the lateral outer side of the right base frame 34 is received and supported from below by a rear portion 38b of the right side step frame 38. is there.

  Each of the left and right side step frames 38 includes a front part 38 a located on the lateral side of the driving step 6 and a rear part 38 b located on the lateral side of the base frame 34. The shape of each of the left and right side step frames 38 when viewed from the side of the body is such that the rear portion 38b is positioned above the front portion 38a. Each of the left and right side step frames 38 has a front end portion connected to a front end portion of the main frame 22 and a rear portion 38b supported by a support frame 37 extending from the main frame 22 outwardly to the aircraft body. It is supported by the body frame 20.

A differential lock pedal 70 that switches the pair of left and right front wheels 1 between a differential lock state and a differential lock release state will be described.
As shown in FIG. 2, the differential lock pedal 70 is arranged at a portion near the rear end of the driving step 6. As shown in FIGS. 3 and 6, the diff lock pedal 70 is linked to a rotation operation shaft 73 of a front wheel diff lock device (not shown) housed in the mission case 21.

  That is, the diff lock pedal 70 passes through a pedal hole 6 a that is provided in the operation step 6 and is located at a lower end side below the operation step 6 and an upper end side above the operation step 6. The pedal body 72 is located above the operation step 6 and supported on the upper end side of the pedal arm 71.

  The rotation operation shaft 73 of the differential lock device extends from the mission case 21 toward the rear of the machine body. A swing arm 74 is attached to the extended end portion of the rotation operation shaft 73 so as not to be relatively rotatable. A connecting shaft portion is provided on the lower end side of the pedal arm 71 by bending the lower end portion of the member forming the pedal arm 71 with respect to the upper end side, and this connecting shaft portion is provided at the distal end portion of the swing arm 74. By being connected so as to be relatively rotatable, the lower end side of the pedal arm 71 is supported by the swing arm 74, and the pedal arm 71 is interlocked and connected to the rotation operation shaft 73. The pedal body 72 is supported so as to move up and down integrally with the pedal arm 71 by connecting a connecting cylinder 75 provided on the back side to the upper end side of the pedal arm 71 so as not to move relative to the pedal arm 71. The pedal arm 71 is inserted through a guide hole provided in a guide member 77 supported by the main frame 22.

  That is, by depressing the pedal body 72, the pedal arm 71 is lowered, and the swing arm 74 is swung downward with the axis of the rotation operation shaft 73 as the swing axis, and the rotation operation shaft 73 is operated. Is rotated to the differential lock side. By releasing the depression operation of the pedal body 72, the rotation operation shaft 73 is rotated to the diff lock release side by the restoring force provided in the diff lock device. Then, the pedal body 72 is restored to the lift release position by the restoring force of the differential lock device.

  The pedal body 72 is configured to be attached to the pedal arm 71 by fitting the connecting cylinder 75 to the pedal arm 71 from the upper side to the outside and attaching a retaining pin 76 across the connecting cylinder 75 and the pedal arm 71. Yes. Therefore, the pedal main body 72 can be detached from the pedal arm 71 by removing the retaining pin 76 and pulling up the connecting cylinder 75 from the pedal arm 71.

  That is, the pedal body 72 is detachably supported by the pedal arm 71, and when the operation step 6 is removed from the machine body, the operation step 6 may be caught on the pedal body 72 by removing the pedal body 72 from the pedal arm 71. It can be removed without it.

[Another Example]
(1) In the above-described embodiment, the rear axle case 51 is supported to be movable up and down by a four-link link mechanism including a pair of left and right upper swing links 52 and a pair of left and right lower swing links 53. Although the example which comprised was shown, you may implement and comprise so that the rear-axle case 51 may be supported so that raising / lowering is possible by the link mechanism of two links provided only with a pair of right and left rocking links.

(2) Although the suspension spring 54 is employed as the suspension mechanism in the above-described embodiment, a suspension cylinder may be employed.

(3) In the above-described embodiment, an example is shown in which the lateral rod 61 is adopted as the lateral mechanism, but a link mechanism may be adopted.

(4) In the above-described embodiment, the example in which the front step frame 35 is configured by a U-shaped member and the rear step frame 36 is configured by a tubular member is shown. You may comprise and implement by. Further, the front step frame 35 and the rear step frame 36 may be configured by a solid member that does not include a hollow portion.

(5) In the above-described embodiment, the length of the front step frame 35 and the rear step frame 36 in the lateral direction of the airframe is determined so that both ends of the front step frame 35 and the rear step frame 36 are from the end of the rear step 9 in the lateral direction of the airframe. Although an example in which the length is set at a position slightly inside the lateral inner side has been shown, the length may be set to the length over the entire length of the rear step 9 in the lateral direction of the body.

(6) In the above-described embodiment, as the members constituting the front step frame 35 and the rear step frame 36, by using a single member having no connection part in the middle, the front step frame 35 and the rear step frame 36 are Although an example in which the frame is configured to be continuous from one end to the other end has been shown, a configuration in which the frame is continuous from one end to the other end by connecting a plurality of divided frames may be implemented. Good.

(7) In the above-described embodiment, an example was adopted in which a pedal configured to slide and move in the vertical direction of the fuselage was adopted as the differential lock pedal 70. However, the differential lock pedal 70 was configured to move in the vertical direction of the aircraft while swinging in the longitudinal direction of the aircraft. It may be carried out by adopting a pedal.

(8) In the above-described embodiment, an example in which the front end portions of the pair of left and right vertical plate portions 55a are connected by the connection plate portion 55b in the link support portion 55 has been described. The rear end portion of the portion 55a may be configured to be connected by the connecting plate portion 55b.

(9) In the above-described embodiment, the shape of the link support portion 55 as viewed in the vertical direction of the machine body is a U-shape in which the connecting portion between the vertically facing plate portion 55a and the connecting plate portion 55b is a square-shaped connecting portion with a small radius. Although the example which was made was shown, you may carry out by making into the U shape where the connection location of the board part 55a to the up-down direction and the connection board part 55b became a round-shaped connection location of a large radius.

(10) In the above-described embodiment, an example in which the vertical cross-sectional shape of the front step frame 35 is a square U-shape has been shown, but a round U-shape may be used.

(11) In the above-described embodiment, the seedling planting device 10 is configured to be capable of planting eight rows, but an example is illustrated in which seedling planting of 7 or less or 9 or more seedlings is possible. May be implemented.

    INDUSTRIAL APPLICABILITY The present invention can be used for a riding paddy field working machine provided with various working devices such as a seeding device in addition to a seedling planting device.

DESCRIPTION OF SYMBOLS 1 Front wheel 2 Rear wheel 4 Driver's seat 6 Driving step 6a Pedal hole 7 Riding part 9 Rear step 10 Working device (seed planting device)
DESCRIPTION OF SYMBOLS 20 Airframe frame 21 Mission case 22 Main frame 24 Connection frame 24a Up-down direction plate part 24b Front-back direction plate part 25 Suspension support part 26 Transmission shaft hole 28 Rotation transmission shaft 30 Riding part frame 31 Riding part frame member (post | support member)
34 frame 35 front step frame 36 rear step frame 50 rear wheel support device 51 rear axle case 52 swing link 54 suspension mechanism (suspension spring)
55 Link support portion 55a Vertical plate portion 55b Connection plate portion 61 Lateral mechanism (lateral rod)
63 Lateral support 70 Differential lock pedal 71 Pedal arm 72 Pedal body

Claims (8)

A pair of left and right front wheels are equipped on the front side of the aircraft,
A pair of left and right rear wheels are equipped via a rear wheel support device on the rear side of the aircraft,
The aircraft frame that the aircraft has is
A transmission case that is transmitted to the front wheels and the rear wheels;
A pair of left and right mainframes facing the front and rear sides, the front side of which is connected to the mission case;
A pair of left and right airframes in the front-rear direction in which a front end portion is connected to a portion below the portion to which the main frame of the transmission case is connected, and a rear end portion is separately connected to the rear side of the pair of left and right main frames. With reinforced frame,
The rear wheel support device includes:
A rear axle case for supporting the left and right pair of rear wheels;
A pair of left and right swing links that extend from the pair of left and right link support portions provided on the airframe so as to be swingable in the rearward direction separately, and support the rear axle case on the extended end side;
A suspension mechanism having an upper end connected to a suspension support provided in the airframe, a lower end connected to the rear axle case, and elastically supporting the rear axle case;
One end side is connected to the lateral support portion provided in the airframe, the other end side is connected to the rear axle case, and includes a lateral mechanism that restricts left and right movement of the rear axle case,
The left link support part is connected across the left main frame and the left reinforcing frame,
The right link support part is connected across the right main frame and the right reinforcing frame,
Each of the pair of left and right link support portions is positioned along the vertical direction of the fuselage, and a pair of left and right vertical plate portions through which a horizontal support shaft for supporting the swing link is inserted, and the pair of left and right tops A riding-type paddy field work machine that includes a connecting plate portion that connects end portions of the downward plate portion in the longitudinal direction of the machine body, and is U-shaped when viewed in the vertical direction of the machine body. A pair of left and right front wheels are equipped on the front side of the aircraft,
A pair of left and right rear wheels are equipped via a rear wheel support device on the rear side of the aircraft,
The aircraft frame that the aircraft has is
A transmission case that is transmitted to the front wheels and the rear wheels;
A pair of left and right mainframes facing the front and rear sides, the front side of which is connected to the mission case;
A pair of left and right airframes in the front-rear direction in which a front end portion is connected to a portion below the portion to which the main frame of the transmission case is connected, and a rear end portion is separately connected to the rear side of the pair of left and right main frames. With reinforced frame,
The rear wheel support device includes:
A rear axle case for supporting the left and right pair of rear wheels;
A pair of left and right swing links that extend from the pair of left and right link support portions provided on the airframe so as to be swingable in the rearward direction separately, and support the rear axle case on the extended end side;
A suspension mechanism having an upper end connected to a suspension support provided in the airframe, a lower end connected to the rear axle case, and elastically supporting the rear axle case;
One end side is connected to the lateral support portion provided in the airframe, the other end side is connected to the rear axle case, and includes a lateral mechanism that restricts left and right movement of the rear axle case,
The left link support part is connected across the left main frame and the left reinforcing frame,
The right-side link support portion is a riding-type paddy field work machine that is connected across the right main frame and the right reinforcing frame. A pair of left and right front wheels are equipped on the front side of the aircraft,
A pair of left and right rear wheels are equipped via a rear wheel support device on the rear side of the aircraft,
A riding part is equipped on the rear side of the aircraft,
A rotation transmission shaft extending in the longitudinal direction of the aircraft that extends from the mission case toward the rear of the aircraft and is transmitted to the working device connected to the rear portion of the aircraft,
The aircraft frame that the aircraft has is
A pair of left and right mainframes facing the aircraft,
A pair of left and right riding part frame members that protrude from the pair of left and right main frames upward and separately form the riding part, and
A fuselage-side connection frame connected across the pair of left and right main frames,
The rear wheel support device includes:
A rear axle case for supporting the left and right pair of rear wheels;
A pair of left and right swing links that extend from the pair of left and right link support portions provided on the airframe so as to be swingable in the rearward direction separately, and support the rear axle case on the extended end side;
A pair of left and right suspension mechanisms, each having an upper end connected to a pair of left and right suspension support portions separately provided on the pair of left and right main frames, a lower end connected to the rear axle case, and elastically supporting the rear axle case; ,
One end side is connected to the lateral support portion provided in the airframe, the other end side is connected to the rear axle case, and includes a lateral mechanism that restricts left and right movement of the rear axle case,
The connecting frame is
Located between the pair of left and right main frames in the vertical direction of the body, the left end of the body is connected to the left main frame and the left suspension support, and the right end of the body is the right main frame and the right side. An up-and-down plate connected to the suspension support of
Extending rearward from the upper end of the up-and-down plate, the left side of the body is connected to the left main frame and the left riding frame member, and the right side of the body is the right main frame and the right frame. A front and rear facing plate portion connected to the right riding section frame member,
The rotational transmission shaft passes through a transmission shaft hole in the front-rear direction of the fuselage provided in a portion of the connection frame located between the pair of left and right main frames, and is positioned between a lower end and an upper end of the main frame. A riding paddy field work machine that passes the position in the longitudinal direction of the aircraft. A pair of left and right front wheels are equipped on the front side of the aircraft,
A pair of left and right rear wheels are equipped via a rear wheel support device on the rear side of the aircraft,
A riding part is equipped on the rear side of the aircraft,
The aircraft frame that the aircraft has is
A pair of left and right mainframes facing the aircraft,
A pair of left and right riding part frame members that protrude from the pair of left and right main frames upward and separately form the riding part, and
A fuselage-side connection frame connected across the pair of left and right main frames,
The rear wheel support device includes:
A rear axle case for supporting the left and right pair of rear wheels;
A pair of left and right swing links that extend from the pair of left and right link support portions provided on the airframe so as to be swingable in the rearward direction separately, and support the rear axle case on the extended end side;
A pair of left and right suspension mechanisms, each having an upper end connected to a pair of left and right suspension support portions separately provided on the pair of left and right main frames, a lower end connected to the rear axle case, and elastically supporting the rear axle case; ,
One end side is connected to the lateral support portion provided in the airframe, the other end side is connected to the rear axle case, and includes a lateral mechanism that restricts left and right movement of the rear axle case,
The connecting frame is
Located between the pair of left and right main frames in the vertical direction of the body, the left end of the body is connected to the left main frame and the left suspension support, and the right end of the body is the right main frame and the right side. An up-and-down plate connected to the suspension support of
Extending rearward from the upper end of the up-and-down plate, the left side of the body is connected to the left main frame and the left riding frame member, and the right side of the body is the right main frame and the right frame. A riding-type paddy field machine comprising a front-rear facing plate portion connected to a right riding portion frame member. A pair of left and right front wheels are equipped on the front side of the aircraft,
A pair of left and right rear wheels are equipped via a rear wheel support device on the rear side of the aircraft,
A riding part is equipped on the rear side of the aircraft,
The aircraft frame that the aircraft has is
A pair of left and right mainframes facing the aircraft,
A pair of left and right riding part frame members that protrude from the pair of left and right main frames upward and separately form the riding part, and
A fuselage-side connection frame connected across the pair of left and right main frames,
The rear wheel support device includes:
A rear axle case for supporting the left and right pair of rear wheels;
A pair of left and right swing links that extend from the pair of left and right link support portions provided on the airframe so as to be swingable in the rearward direction separately, and support the rear axle case on the extended end side;
A pair of left and right suspension mechanisms, each having an upper end connected to a pair of left and right suspension support portions separately provided on the pair of left and right main frames, a lower end connected to the rear axle case, and elastically supporting the rear axle case; ,
One end side is connected to the lateral support portion provided in the airframe, the other end side is connected to the rear axle case, and includes a lateral mechanism that restricts left and right movement of the rear axle case,
The left side of the body of the connection frame is connected to the left suspension support part and the left riding part frame member,
A riding paddy field work machine in which a right side portion of the body of the connection frame is connected to the right suspension support portion and the right riding portion frame member. A pair of left and right front wheels are equipped on the front side of the aircraft,
A pair of left and right rear wheels are equipped on the rear side of the aircraft,
A riding part having a rear step located behind the driver's seat on the rear side of the aircraft is equipped,
The aircraft frame that the aircraft has is
A pair of left and right mainframes facing the aircraft,
A riding section frame disposed above the pair of left and right main frames,
The riding section frame is
A pair of left and right airframe front and rear frame frames arranged above the pair of left and right main frames;
The left side of the fuselage is positioned on the left side of the left side of the fuselage with respect to the left frame and the right side of the fuselage is positioned on the right side of the right side of the frame with respect to the right side of the frame. A front step frame that is supported and receives and supports the rear step from below;
The left side of the fuselage is positioned on the left side of the left side of the fuselage with respect to the left side frame, and the right side of the side of the fuselage is positioned on the right side of the right side with respect to the right side of the frame. And a rear step frame facing the fuselage for receiving and supporting the rear step from below,
The front step frame is a member that is continuous from the left end of the body to the right end of the body, and is configured by a U-shaped member that has a longitudinal sectional shape that opens toward the rear of the body.
The rear step frame is a riding-type paddy field work machine configured by a tubular member continuous from the left end of the body to the right end of the body. A pair of left and right front wheels are equipped on the front side of the aircraft,
A pair of left and right rear wheels are equipped on the rear side of the aircraft,
A riding part having a rear step located behind the driver's seat on the rear side of the aircraft is equipped,
The aircraft frame that the aircraft has is
A pair of left and right mainframes facing the aircraft,
A riding section frame disposed above the pair of left and right main frames,
The riding section frame is
A pair of left and right airframe front and rear frame frames arranged above the pair of left and right main frames;
The left side of the fuselage is positioned on the left side of the left side of the fuselage with respect to the left frame and the right side of the fuselage is positioned on the right side of the right side of the frame with respect to the right side of the frame. A front step frame that is supported and receives and supports the rear step from below;
The left side of the fuselage is positioned on the left side of the left side of the fuselage with respect to the left side frame, and the right side of the side of the fuselage is positioned on the right side of the right side with respect to the right side of the frame. And a rear step frame facing the fuselage for receiving and supporting the rear step from below,
The front step frame and the rear step frame are riding-type paddy field machines configured by members that are continuous from the left side of the machine body to the right side of the machine body. A pair of left and right front wheels are equipped on the front side of the aircraft,
A pair of left and right rear wheels are equipped on the rear side of the aircraft,
A riding section having a driver's seat and a driving step is equipped on the rear side of the aircraft,
The driving step is provided with a differential lock pedal for switching the pair of left and right front wheels between a differential lock state and a differential lock release state,
The differential lock pedal is
A lower end side is supported below the operation step, and an upper end side protrudes above the operation step from a pedal hole provided in the operation step, and a pedal arm,
A riding-type paddy field work machine comprising a pedal body that is detachably supported by the pedal arm above the operation step.

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