JP2020145965A - Rice field implement - Google Patents

Abstract

To provide a rice field implement capable of improving operation ability of a speed change lever between strains.SOLUTION: A rice field implement comprises: a seedling planting mechanism which is driven so that, a tip of a planting pawl draws a circulation rotary locus and is moved so as to circulate and reciprocate in a vertical direction between a seedling mount surface and a rice field surface; a speed change mechanism between strains which is provided on a power transmission part for transmitting power to the seedling planting mechanism from an engine, and changing drive speed of the seedling planting device to travel speed; a speed change lever 77 between strains for operating the speed change mechanism between strains; a driver seat; a drive part step 3 provided on a side part and a front part of the driver seat. In the drive part step 3, an opening 111 is provided on a front region of the driver seat, the speed change lever 77 between strains can be operated through the opening 11 and a lid part 112 is provided for closing the opening 111 for serving as a part of the drive part step 3.SELECTED DRAWING: Figure 9

Description

The present invention relates to a paddy field working machine configured to cut out and plant seedlings placed and housed on a seedling stand by a rotary seedling planting device.

In paddy field work machines, seedlings may be planted by changing the interval (between stocks) in the planting direction of seedlings. Therefore, the conventional paddy field working machine is provided with an inter-strain transmission section that changes the planting pitch in the traveling direction between the standard stocks and the stocks wider than the standard stocks. Usually, the inter-stock transmission unit is configured so that the speed change can be adjusted by an operation tool, and the operation tool may be provided in the operation unit step (see, for example, Patent Document 1).

In Patent Document 1, the operation unit of the inter-stock speed change unit is for a speed change lever whose base is rotatably supported by a support portion of the front mission case and a speed change lever provided on one end side of the floor plate of the operation unit in the left-right direction. The floor plate sheet is provided with an operation groove and a lid portion provided on the floor plate sheet so as to open and close the operation groove. To change the distance between stocks with the inter-stock speed change section, the lid is turned up to open the operation groove, and the speed change lever arranged in the operation groove is operated.

JP-A-2010-124809

In the configuration described in Patent Document 1, since the operation groove for the shift lever of the inter-stock transmission is located at a position away from the driver's seat, the driver cannot operate the operation tool from the driver's seat. Further, in the configuration in which the lid portion is provided on the floor plate sheet, the durability of the lid portion may decrease due to repeated opening and closing of the lid portion.

The present invention is to provide a paddy field working machine capable of improving the operability of the inter-stock speed change lever.

The features of the paddy field working machine of the present invention are a seedling planting mechanism in which the tip of the planting claw is driven to reciprocate and circulate vertically between the seedling stand and the paddy field in a circular rotation locus.
An inter-strain transmission mechanism provided in a power transmission unit that transmits power from the engine to the seedling planting mechanism and shifts the driving speed of the seedling planting mechanism with respect to the traveling speed.
An inter-stock speed change lever that operates the inter-stock speed change mechanism,
With the driver's seat
A driver step provided on the side and front of the driver's seat is provided.
In the driver step, an opening is formed in the front region of the driver seat.
The inter-stock speed change lever is arranged so as to be operable from the opening.
A lid is provided that closes the opening and becomes part of the driving step.

According to this configuration, the inter-stock shift lever can be operated through the opening formed in front of the driver's seat in the driver step, and the operability of the inter-stock shift lever is improved. Further, since the opening formed in the driving part step is closed by the lid part forming a part of the driving part step, the durability of the lid part is improved without impairing the function of the driving part step by the lid part. Can be improved.

In the present invention, it is preferable that the driving unit step is composed of a resin body integrally formed in the left-right direction of the machine body.

According to the present invention, since the driver step is a resin body integrally formed in the left-right direction of the machine body, it is easy to form an opening in the region in front of the driver's seat in the driver step. Further, since the operation unit step is made of a resin body, the weight can be reduced and the total weight of the paddy field working machine can be suppressed. Further, since the lid portion is lightweight, the lid portion can be easily opened and closed.

In the present invention, it is preferable that the lid portion is configured so that the opening can be opened and closed at a fulcrum on the rear side of the machine body.

According to this configuration, since the lid can be opened and closed by swinging at the rear fulcrum, the driver does not need to lift the entire lid to open the opening, and the lid can be easily opened and closed. be able to.

In the present invention, the inter-stock shift lever includes a first shift lever that can be operated in the left-right direction of the machine body and a second shift lever that can be operated in the front-rear direction of the machine body, and the first shift lever and the second shift lever. It is preferable to perform inter-stock shifting based on the operating position of the shifting lever.

According to this configuration, by combining the positions of the two shift levers, the inter-stock transmission can be switched to a plurality of shift states. Further, since the operating directions of the two shifting levers are orthogonal to each other, the operating positions of the two shifting levers can be easily grasped.

In the present invention, it is preferable that a pattern display unit for displaying information corresponding to the operating positions of the first shift lever and the second shift lever is provided below the lid portion.

According to this configuration, since the information corresponding to the operation positions of the two shift levers can be confirmed by the pattern display unit, the inter-stock shift state based on the operation positions of the two shift levers can be easily grasped.

In the present invention, it is preferable that the pattern display unit is provided within the operating range of the first shift lever and the second shift lever.

According to this configuration, since the pattern display unit is provided within the operating range of the first shifting lever and the second shifting lever, it is possible to more reliably grasp the inter-stock shifting state based on the operating positions of the two shifting levers. it can.

In the present invention, the lid portion has a plurality of protrusions on the back surface side, and the opening has a guide groove of the inter-stock speed change lever and the lid portion in a closed state in contact with the protrusions. It is preferable that a supporting frame portion is provided.

According to this configuration, the inter-stock speed change lever can be smoothly operated by the guide groove at the opening of the step of the driving unit, and the protrusion on the back surface side of the lid abuts on the frame and the lid becomes the frame. Be supported. As a result, the closed lid portion can be held more stably in the operation unit step.

In the present invention, the opening is provided with a first guide groove of the first shift lever, a second guide groove of the second shift lever, and a frame portion for supporting the closed lid portion. The frame portion has a partition portion for partitioning the first guide groove and the second guide groove, and the partition portion is formed over the pattern display unit and the operation unit step. Suitable.

According to this configuration, since the opening of the step of the driving unit has the first guide groove and the second guide groove partitioned by the partition of the frame portion, the first shift lever and the second shift lever are independent guide grooves. You will be guided and can operate smoothly. Further, since the closed lid portion is supported by the frame portion, the lid portion can be reliably supported. Further, since the partition portion is formed over the pattern display unit and the operation unit step, the partition unit and the pattern display unit can be clearly distinguished.

It is a side view which shows the whole of a riding type rice transplanter. It is a top view which shows the whole of a riding type rice transplanter. It is a top view which shows the correlation between a driving part step and a wheel and other device. It is an exploded perspective view which shows the driving part step. It is a diagram which shows the power transmission system. It is a perspective view which shows the connection state of the interstock case part and the branch case part with respect to the main case part. It is sectional drawing in the vertical direction of the interstock case part in a mission case. It is the enlarged sectional view in the vertical direction of the transmission mechanism in the inter-stock case part. It is a perspective view which shows the open state of the lid part of a driving part step. It is explanatory drawing which shows the pattern display part of the lever guide part for inter-stock shifting. It is sectional drawing in the vertical direction of the interstock case part in the mission case of another embodiment. It is the enlarged sectional view in the vertical direction of the transmission mechanism in the inter-stock case part of another embodiment.

Hereinafter, an example of the embodiment of the present invention will be described based on the description in the drawings.
Unless otherwise specified, the front-back direction, the up-down direction, and the left-right direction in the embodiment are described as follows. As shown in FIGS. 1 and 2, the traveling direction on the forward side is "F" and the traveling direction on the reverse side is "B" during the working travel of the paddy field work machine. The direction corresponding to the right side is "R" and the direction corresponding to the left side is "L" with respect to the forward-facing posture of the paddy field working machine in the front-rear direction. Further, the direction corresponding to the upper side of the paddy field working machine is "U", and the direction corresponding to the lower side is "D".

[Overall configuration of paddy field work machine]
FIG. 1 shows the side surfaces of a passenger-type rice transplanter, which is an example of the paddy field working machine according to the present invention, and FIG. 2 shows the planes thereof. This passenger-type rice transplanter is equipped with a seedling planting device 2 behind the traveling machine 1 to perform seedling planting work.
The traveling machine body 1 includes a body frame 10 having a pair of left and right main frames 10A and 10A facing the front and rear of the vehicle body, and a pair of left and right front wheels 11F and 11F and a pair of left and right rear wheels 11R mounted on the lower part of the body frame 10. , 11R is configured to be self-propelled.

As shown in FIGS. 1 to 3, a driving unit A equipped with an engine 12 and a mission case 13 that output driving force to the front wheels 11F and the rear wheels 11R is provided at the front portion of the traveling machine body 1. A boarding-type driving unit C having a driver's seat 15 is provided on the rear side of the traveling machine body 1.
In the driving unit C, a driving unit step 3 for boarding is provided on the upper side of the fuselage frame 10. A driver's seat 15 is provided on the driver's step 3, and the steering wheel 14 arranged at the rear of the driving unit A can be operated while seated in the driver's seat 15.
Spare seedling cradle 16 for mounting spare seedlings on the lateral side of the traveling machine 1 corresponding to the left and right sides of the driving unit A in the front part of the driving unit C, sandwiching the front part of the driving unit step 3 Is erected.

A fertilizer application device 9 for four rows is provided at the rear of the driver unit C on the rear side of the driver's seat 15, and the passenger-type rice transplanter is configured to have a mid-mount fertilizer application specification. The fertilizer application device 9 feeds the fertilizer stored in the fertilizer tank 90 in predetermined amounts from a feeding device (not shown), sends the fertilizer to the groove-growing device 91 equipped in the seedling planting device 2 through a supply route (not shown), and supplies the fertilizer to the field. It is configured to do.

[Seedling planting device]
The seedling planting device 2 is connected to the rear portion of the machine frame 10 so as to be able to move up and down via a link mechanism 17.
In this seedling planting device 2, a seedling stand 20 for four-row planting on which four mat-shaped seedlings can be mounted, a feed case 21 in which the driving force from the engine 12 is input via the transmission shaft 27, and It is provided with four planting drive cases 22 which are arranged at predetermined intervals in the lateral direction of the vehicle body. In each of the four planting drive cases 22, seedling planting mechanisms 23 are movably provided on both lateral sides on the rear end side. At the bottom of the planting frame (not shown) connecting each planting drive case 22, four ground leveling floats 24 are installed in a state of being lined up in the lateral direction of the vehicle body.

Each seedling planting mechanism 23 drives two planting claws 23a at positions phased 180 degrees around the center of rotation in the left-right direction by a driving force transmitted from the feed case 21 to the planting drive case 22. It has a well-known structure. The tip of each planting claw 23a is driven so as to draw a long rotation locus in the vertical direction, and the two planting claws 23a alternately take out the planted seedlings from the lower end of the seedling stand 20 and level the ground. Seedlings are planted in the mud layer that has been leveled by the float 24. In this way, the seedling planting mechanism 23 is driven so that the tip of the planting claw 23a reciprocates and reciprocates in the vertical direction between the seedling loading table 20 and the rice field surface in a circular rotation locus.
In this seedling planting device 2, the link mechanism 17 is swung up and down with respect to the machine frame 10 by the elevating cylinder 18, so that the ground leveling float 24 is in contact with the mud surface of the field and the ground leveling float. Twenty-four is raised and lowered away from the mud surface of the field to a rising non-working state.

[Power transmission system]
With reference to FIG. 5, the power transmission structure in the mission case 13 (an example of the power transmission unit) in which the power of the engine 12 is transmitted will be described.
The power of the engine 12 input to the mission case 13 is a traveling drive system for driving the front wheels 11F, the rear wheels 11R, etc., and a working device for driving the seedling planting device 2 in the mission case 13. The output is branched into a drive system and a fertilizer application drive system for driving the fertilizer application device 9.

The mission case 13 includes a main case portion 13a in which the auxiliary transmission mechanism 93 and the like of the traveling drive system are housed, and an interstock case portion 13b and a branch case portion 13c arranged on the rear side of the main case portion 13a. ..
The inter-stock case portion 13b incorporates an inter-stock transmission mechanism 94 that shifts and transmits the power output from the main case portion 13a to the seedling planting device 2, and the branch case portion 13c contains the power output from the main case portion 13a. A branch transmission mechanism 95 for branch transmission to the fertilizer application device 9 is installed.

The power of the engine 12 is transmitted to the pump shaft 60a of the hydrostatic continuously variable transmission 6 mounted on the outer wall of the main case 13a in the mission case 13, and is transmitted from the motor shaft 61a of the hydrostatic continuously variable transmission 6. It is input to the main case unit 13a. That is, the hydrostatic continuously variable transmission 6 is used as a continuously variable transmission, and the power output from the main transmission is further changed in the transmission case 13.

[Driving drive system]
First, the transmission structure of the traveling drive system will be described.
As shown in FIG. 5, the power of the engine 12 is transmitted to the pump shaft 60a, which is the shift input shaft of the hydrostatic continuously variable transmission 6, via the belt transmission mechanism 62, and the hydraulic pump 60 is rotationally driven. .. The motor shaft 61a, which is the speed change output shaft of the hydrostatic continuously variable transmission 6, is connected to the first speed change shaft 25 of the main case portion 13a in a spline-fitted state, and the first speed change shaft is connected as the motor 61 rotates. 25 is rotationally driven.

A second transmission shaft 26 having an axis parallel to the first transmission shaft 25 is pivotally supported by the main case portion 13a. The power transmitted from the first transmission shaft 25 to the second transmission shaft 26 via the shift member is transmitted to the differential case 65. The left and right front wheel drive shafts 63 and rear wheel output shafts 64 are rotationally driven as the differential case 65 rotates.

[Working equipment drive system]
A work device drive system for transmitting power to the seedling planting device 2 will be described separately from the traveling drive system described above.
The power to the seedling planting device 2 extends from the inter-stock case portion 13b to the rear side via the inter-stock transmission mechanism 94 and the planting clutch 8 in the inter-stock case portion 13b attached to the rear portion of the main case portion 13a. It is taken out from the output transmission shaft body 42 and transmitted to the rear seedling planting device 2.

Power transmission from the main case portion 13a into the inter-stock case portion 13b is transmitted to the work system transmission shaft 37 provided in the left-right direction in the main case portion 13a, the bevel gear 37a fixed to the work system transmission shaft 37, and the bevel gear 37a. This is done via the meshing output bevel gear 38. Power is transmitted from the first transmission shaft 25 to the work system transmission shaft 37 via the external gears of each.

In the inter-stock case portion 13b, as shown in FIG. 7, a work drive shaft 41 long in the front-rear direction is arranged in the front-rear direction of the inter-stock case portion 13b.
The work drive shaft 41 is rotatably relative to the output transmission shaft body 42 to which the transmission shaft 27 (see FIG. 1) to the rear seedling planting device 2 is connected and the front end side portion of the output transmission shaft body 42. It is configured to have a partial double shaft structure by the tubular shaft body 43 which is fitted externally and the power on the upper side in the transmission direction is transmitted.

The front end portion of the tubular shaft body 43 located on the upper side of the transmission is arranged so as to invade the main case portion 13a. A spline portion is formed at a portion of the tubular shaft body 43 located on the most superior side in the transmission direction, and the spline portion is located in the main case portion 13a on the inner peripheral side of the tubular boss of the output bevel gear 38. It is inserted in the part.
The output bevel gear 38 is supported on the outer peripheral side of the boss portion by a ball bearing 38a provided in the main case portion 13a, whereby the tubular shaft body 43 inserted on the inner peripheral side is also supported.
Further, the ball bearing 38a provided in the main case portion 13a is supported by internally fitting a portion of the tubular shaft body 43 having a slightly larger diameter on the rear side than the portion inserted into the output bevel gear 38. ing. Further, a portion having a larger diameter in the tubular shaft body 43 is in contact with the rear end side of the inner race of the ball bearing 38a. As a result, the position of the tubular shaft body 43 is restricted to the front side.

The tubular shaft body 43 is formed with a small diameter hole 43b communicating with the internal space of the main case portion 13a on the front side of the large diameter hole 43a into which the output transmission shaft body 42 is inserted. The small-diameter hole 43b and the large-diameter hole 43a of the tubular shaft body 43 serve as an inner peripheral side passage that communicates the internal space of the main case portion 13a and the internal space of the inter-stock case portion 13b.

The intermediate tubular body 44 and the rear tubular body 45 are fitted on the outer peripheral portion of the output transmission shaft body 42 on the rear side of the portion where the tubular shaft body 43 exists so as to be relatively rotatable. A torque limiter 46 is provided between the rear end portion of the intermediate tubular body 44 and the front end portion of the rear tubular body 45. A planting clutch 8 is provided between the rear end portion of the rear tubular body 45 and the output transmission shaft body 42 on the rear side of the rear tubular body 45.
In this way, the intermediate tubular body 44 and the rear tubular body 45 are externally fitted to the outer peripheral portion of the output transmission shaft body 42 so as to be relatively rotatable, and the output transmission shaft body 42 is a tubular shaft. Since it exists in the inner peripheral side passage of the body 43, it is easy to perform good lubrication in the inter-stock case portion 13b. That is, the lubricating oil existing in the internal space of the main case portion 13a flows through the inner peripheral side of the cylinder boss of the output bevel gear 38, and as shown by the broken line arrow in FIG. 7, the tubular shaft body 43 and the intermediate cylinder Rotate on the work drive shaft 41 from between the body 44, between the intermediate tubular body 44 and the rear tubular body 45, and between the rear tubular body 45 and the output transmission shaft body 42 on the rear side. It is possible to lubricate well while utilizing the centrifugal force accompanying the rotation of the member.

[Inter-stock transmission mechanism]
The inter-stock transmission mechanism 94 will be described.
The inter-stock transmission mechanism 94 includes a first transmission unit 94A located on the transmission upper side and a second transmission unit 94B located on the transmission lower side. The first transmission unit 94A is configured to perform high and low two-speed shifting, and the second transmission unit 94B is configured to perform high, medium, and low three-speed shifting, and a total of six speed shifting is performed. Has been done.

In the first transmission unit 94A, the shift gear 47 provided on the tubular shaft body 43 of the work drive shaft 41 and the driven side gear 48a fixedly supported by the front end portion of the shift shaft 48 located parallel to the work drive shaft 41. Is provided. The tubular shaft body 43 has a spline portion 43c formed on the outer peripheral portion thereof, and a shift gear 47 externally fitted to the spline portion 43c is integrally rotatable and slidable. The shift gear 47 includes a first tooth portion 47a and a second tooth portion 47b having slightly different numbers of teeth and having similar diameters, and one of the tooth portions 47a and 47b meshes with the driven side gear 48a. As is possible, the position can be changed along the axial direction of the tubular shaft body 43.

As shown in FIG. 7, the movement range of the shift gear 47 is the second shift position in which both the first tooth portion 47a and the second tooth portion 47b are located in the interstock case portion 13b, and the first tooth portion 47a portion. The shift operation position can be switched to the first shift position located in the internal space of the main case portion 13a, all or part of which protrudes from the inter-stock case portion 13b. The operating range of the inter-stock shifting operating member 100 is set so that the shift gear 47 can be moved between the first shifting position and the second shifting position.

Further, the shift gear 47 is formed with a gap between the first tooth portion 47a and the second tooth portion 47b so that the locking pin 102 of the interstock speed change operation member 100, which will be described later, can be inserted into the inserted state. The shift gear 47 includes a boss portion 47c that protrudes forward from the first tooth portion 47a, and a portion corresponding to the boss portion 47c is provided toward the rear side from the second tooth portion 47b. Not. That is, the shift gear 47 is provided with the boss portion 47c only on the front end portion side, which is the end portion on one side of the end portions in the front-rear direction. The protruding length of the boss portion 47c is set so as to prevent the shift gear 47 from being assembled in the reverse direction in the front-rear direction with respect to the tubular shaft body 43.

That is, when the shift gear 47 is assembled to the tubular shaft body 43 in the opposite direction in the front-rear direction, even if the first tooth portion 47a is operated on the engaging side with the driven side gear 48a, the boss portion 47c of the shift gear 47 The end portion of the tooth portion 47a abuts on the front end portion 44a of the intermediate tubular body 44, and the first tooth portion 47a cannot be moved to the engagement portion with the driven side gear 48a. Since the protruding length of the boss portion 47c is set in this way, the fact that the boss portion 47c is provided only at one end portion serves as a means for preventing the shift gear 47 from being assembled in the opposite direction. There is.

A speed change shaft 48 positioned parallel to the work drive shaft 41 is provided in the inter-stock case portion 13b. A second transmission unit 94B is provided over the transmission shaft 48 and the output transmission shaft body 42 of the work drive shaft 41. The second transmission unit 94B is on the lower transmission side than the driven side gear 48a, and is in a state of being normally engaged with a plurality of (three in the figure) transmission gears 49 supported by the transmission shaft 48 and the transmission gears 49. It is provided with a gear pair consisting of a plurality of (three in the figure) driven transmission gears 44b fixed to an intermediate tubular body 44 that is externally fitted to the output transmission shaft body 42. The transmission gear 49 supported by the transmission shaft 48 is provided in a loosely fitted state so as to be rotatable relative to the transmission shaft 48.

Between the plurality of transmission gears 49 and the plurality of driven transmission gears 44b in the normally engaged state, any one of the plurality of transmission gears 49 is operated by the transmission operation body 70 which is slid in the transmission shaft 48. When one is selected, the shifting power is transmitted to the output transmission shaft body 42 side via the gear pair.
That is, with respect to the driven transmission gear 44b that is in mesh with the transmission gear 49 selected by the transmission operating body 70, the rotation of the transmission shaft 48 is the gear ratio between the transmission gear 49 and the driven transmission gear 44b that are in mesh with each other. It is transmitted as shifting power according to.

The speed change operating body 70 includes a speed change key portion 71 having a locking projection 71a configured to be disengageable from the engaging recess 49a formed on the inner peripheral side of each speed change gear 49, and the speed change key portion 71 thereof. The sliding operation unit 72 is provided by sliding the position of the locking projection 71a in the axial direction of the transmission shaft 48 to select and operate the engagement position with respect to the transmission gear 49 to be engaged.
Further, it is provided with an elastic urging mechanism 73 that presses the locking projection 71a of the shifting key portion 71 against the engaging recess 49a on the inner peripheral side of the shifting gear 49 to be engaged.

As shown in FIGS. 7 and 8, the shift key portion 71 and the slide operation portion 72 have the rear end side projecting piece 71b of the shift key portion 71 in the outer peripheral groove 72a formed in the front end portion of the slide operation portion 72. It is connected by engaging.
Therefore, as the slide operation unit 72 is pushed and pulled back and forth in the axial direction, the shift key portion 71 also moves back and forth in the same direction.
The state shown in FIG. 7 shows the state in which the slide operation portion 72 is pushed most into the inter-stock case portion 13b. In this state, the locking projection 71a of the shifting key portion 71 engages with the engaging recess 49a of the shifting gear 49 on the frontmost end side of the plurality of shifting gears 49 to transmit the rotational power of the shifting shaft 48 to the frontmost end. It is transmitted to the transmission gear 49 on the side.
The state in which the transmission gear 49 on the frontmost end side is selected is the low-speed transmission position in which the rotation of the transmission shaft 48 is transmitted to the output transmission shaft body 42 side at the lowest speed by the second transmission unit 94B.

The frontmost transmission gear 49 existing at the low speed transmission position is composed of an eccentric gear, and meshes with a driven transmission gear 44b on the frontmost end side of the intermediate tubular body 44, which is also composed of the eccentric gear.
In the transmission state at this low-speed transmission position, the drive speed of the planting claw 23a in the seedling planting device 2 is the slowest with respect to the traveling speed, and the inter-strain pitch is the longest in the second transmission unit 94B. At this time, the drive torque of the transmission gear 49 by the transmission shaft 48 can be the smallest. Further, in the transmission state at the low speed transmission position, the rotation of the transmission shaft 48 is transmitted to the intermediate tubular body 44 side in the transmission state at an unequal speed. This is because the driving speed of the planting claw 23a is the slowest, so that the claw in the middle of planting can be prevented from being dragged in the mud on the rice field surface as much as possible. That is, in the drive rotation locus of the planted claw 23a, the drive speed in the range in which the claw exists in the mud is partially increased so that the claw can quickly escape from the mud.

The state shown in FIG. 8 shows a state in which the slide operation portion 72 is pulled out most to the outside of the interstock case portion 13b. In this state, the locking projection 71a of the speed change key portion 71 engages with the engagement recess 49a of the speed change gear 49 on the rearmost end side of the plurality of speed change gears 49 to transfer the rotational power of the speed change shaft 48 to the rearmost end. It is transmitted to the transmission gear 49 on the side.
The state in which the transmission gear 49 on the rearmost end side is selected is the high-speed transmission position in which the second transmission unit 94B transmits the rotation of the transmission shaft 48 to the output transmission shaft body 42 side at the highest speed. In the transmission state at this high-speed transmission position, the drive speed of the planting claw 23a in the seedling planting device 2 is relatively high with respect to the traveling speed, and the inter-strain pitch is the shortest in the second transmission unit 94B. At this time, the drive torque of the transmission gear 49 by the transmission shaft 48 becomes the largest.

Although not shown, the intermediate speed transmission position is an intermediate position between the state in which the slide operation portion 72 is pushed most into the interstock case portion 13b and the state in which the slide operation portion 72 is pulled out most outward.
In this medium speed transmission position, the locking projection 71a of the shift key portion 71 engages with the engagement recess 49a of the shift gear 49 existing at the intermediate position among the plurality of shift gears 49, and the shift shaft 48. The rotational power is transmitted to the transmission gear 49 at the intermediate position. In the transmission state at the medium speed transmission position, the driving speed of the planting claw 23a in the seedling planting device 2 is an intermediate speed with respect to the traveling speed, and the inter-strain pitch is also an intermediate length. At this time, the drive torque of the transmission gear 49 by the transmission shaft 48 also becomes an intermediate magnitude.

The elastic urging mechanism 73 presses and urges the steel balls 73b urged by the coil spring 73a against the recessed portions 71c formed at a plurality of locations in the longitudinal direction of the speed change key portion 71. When the steel ball 73b is pressed and urged against the recessed portion 71c of the shift key portion 71, the locking projection 71a that is formed so as to protrude on the side opposite to the recessed portion 71c is included in the transmission gear 49 to be engaged. It is pressed and urged to the engaging recess 49a on the peripheral side. The elastic urging mechanism 73 is configured by including the coil spring 73a, the steel ball 73b, and the recessed portion 71c.

The shift key portion 71 is an elastic urging mechanism 73 having an engagement portion between the outer peripheral groove 72a and the rear end side projecting piece 71b as a swing fulcrum, which is a connection portion between the shift key portion 71 and the slide operation portion 72. In the direction of pressing and urging, that is, the direction intersecting the slide operation direction of the slide operation unit 72, the gear 49 is configured to be swingable toward the engaging recess 49a on the inner peripheral side.
The pressing urging portion by the elastic urging mechanism 73 is provided at a position farther from the swing fulcrum than the plurality of gear pairs in the second transmission unit 94B. Therefore, the gear pair in which the inter-stock pitch is set shorter by the action of the lever exerts the stronger pressing urging action by the elastic urging mechanism 73.

Of the transmission gears 49 in the second transmission unit 94B, the high-speed gear on the rearmost end side and the medium-speed gear at the intermediate position are sandwiched by the collar 74 from both sides. The low-speed gear on the frontmost end side is provided so as to be sandwiched between the collar 74 and a part of the transmission shaft 48.
As shown in FIG. 8, the distances a1, a2, and a3 between the collars 74 are such that the gear pair in which the pitch between stocks is set shorter by the seedling planting device 2 exists, the more the shift key portion 71 is engaged with the shift gear 49. Wide intervals are set so that the total amount is large.
That is, the locking projection 71a is formed in a tapered chevron shape as shown in FIGS. 7 and 8. Therefore, if the distances a1, a2, and a3 between the collars 74 are wide, they are deeply engaged with the engaging recess 49a of the transmission gear 49, and the engagement allowance is large. The engagement allowance with respect to the recess 49a becomes small.

In the transmission gear 49 of the second transmission gear 49B, the width in the front-rear direction of the tooth portions 49b of the portion meshing with the driven transmission gear 44b is all set to be the same width, but in the circumferential direction on the hub surface of each transmission gear 49. The bulging portions 49c scattered at a plurality of locations are formed. The amount of protrusion of the bulging portion 49c is different for each transmission gear 49.
That is, as shown in FIG. 8, the front low-speed gear has a bulging portion 49c formed on the rear hub surface with a small protrusion amount, and the intermediate speed gear has a large protrusion amount on the rear hub surface. A bulge 49c is formed. The rearmost high-speed gear has bulging portions 49c and 49c protruding from the hub surfaces on both front and rear sides in both front and rear directions.
As a result, the width of the tooth portion 49b of the transmission gear 49 and the width in the front-rear direction including the bulging portion 49c are set to a width that matches the above-mentioned distances a1, a2, and a3 between the collars 74.

As a result, the distances b1 and b2 between the teeth 49b of the speed change gear 49 are the distances b1 between the teeth 49b of the speed change gear 49 existing at locations where the distances a1, a2 and a3 between the collars 74 are widened. The distance b2 between the tooth portions 49b of the transmission gear 49 existing at a position where the distances a1, a2, and a3 between the collars 74 are narrowed is set to be smaller than that.

The speed change operating body 70 is slid in the axial direction of the speed change shaft 48 by operating the second speed change lever 79.
As shown in FIGS. 6 and 7, a second speed change lever 79 is connected to the slide operation part 72 of the speed change operation body 70 so as to be relatively rotatable at the rear end portion. The lower end of the second speed change lever 79 is connected to the slide operation portion 72, and the intermediate portion in the vertical direction is supported by the lever support portion 76 provided on the upper portion of the interstock case portion 13b.
As a result, in the portion of the rod of the second shift lever 79 that is supported by the lever support portion 76 so as to be relatively rotatable, the center of the rod portion at the intermediate portion position along the vertical direction of the second shift lever 79 becomes the center. It becomes a de facto swing center, and the second shift lever 79 is swinged around the swing center line y1 indicating the swing center.
Therefore, by swinging the second speed change lever 79 around the swing center line y1, the slide operation unit 72 of the speed change operation body 70 is configured to slide and move along the axis direction of the speed change shaft 48. ing.
The lever support portion 76 supports the intermediate portion of the second speed change lever 79 in the vertical direction so as to be relatively rotatable, and the movement of the intermediate portion in the front-rear direction is restricted while being restricted in the horizontal direction. A pair of upper and lower recessed pivots 76a formed in a U shape in a plan view are provided so that the position movement is allowed within a predetermined range. By allowing the intermediate portion of the second shift lever 79 in the vertical direction to move within a predetermined range in the horizontal direction in this way, the center of the intermediate portion in the vertical direction of the second shift lever 79 and the axis center. The matching swing center line y1 also moves within a predetermined range in the left-right direction.
That is, by supporting the swing center line y1 in a state where the position can be moved within a predetermined range in the left-right direction, the second shift lever 79 does not hinder the movement of the slide operation unit 72 that moves linearly in the front-rear direction. It is configured so that the swinging operation of can be performed.

The inter-stock speed change operation member 100 in the inter-stock speed change mechanism 94 is configured as shown in FIGS. 6 and 7.
That is, a locking pin 102 that fits between the first tooth portion 47a and the second tooth portion 47b is fixed to the lower end portion of the operation shaft 101 that penetrates the upper wall portion of the interstock case portion 13b, and the upper wall. A plate-shaped operating body 103 is provided at the upper end of the operating shaft 101 located outside the portion.
By rotating the plate-shaped operating body 103 around the axis of the operating shaft 101, the locking pin 102 existing at the eccentric position is configured to change the position of the shift gear 47 in the axial direction of the working drive shaft 41. Has been done. The position of the plate-shaped operating body 103 around the axis is positioned by the ball detent mechanism 104. The plate-shaped operating body 103 is linked to a first speed change lever 78, which will be described later.

The power shifted by the inter-stock transmission mechanism 94 is transmitted from the intermediate tubular body 44 to the torque limiter 46.
The torque limiter 46 includes a disk-shaped receiving plate 46a fixed to the rear end of the intermediate tubular body 44, a pushing plate 46b that abuts toward the receiving plate 46a, and the pushing plate 46b toward the receiving plate 46a. It is configured to include a coil spring 46c for pressing and urging toward. Through the torque limiter 46, the shifting power by the inter-stock shifting mechanism 94 is transmitted to the planting clutch 8.

[Plant clutch]
The planting clutch 8 is configured as follows.
Of the working drive shaft 41, at the rear end of the rear tubular body 45, a disk-shaped drive-side rotating member that engages with the outer peripheral side spline of the rear tubular body 45 and rotates integrally with the rear tubular body 45. 80 is provided.
On the outer peripheral side of the output transmission shaft body 42 extending to the rear side of the rear tubular body 45, the spline portion 42a formed on the outer peripheral surface of the output transmission shaft body 42 is engaged with the output. A driven side rotating member 81 that can rotate integrally with the transmission shaft body 42 and can move its position in the axial direction of the output transmission shaft body 42 is provided.
The driven-side rotating member 81 is pressed and urged toward the driving-side rotating member 80 by a pressing spring 92, and the driven-side rotating member 80 and the driven-side rotating member 81 face each other on opposite surfaces. The meshing portions 80a and 81a capable of transmitting power in the meshed state are formed.

The pressing spring 82 is provided between the spring receiving portion 81b formed on the surface of the driven side rotating member 81 opposite to the side on which the meshing portion 81a is formed and the fixing portion on the inner surface side of the interstock case portion 13b. Has been done. As the fixing portion on the inner surface side of the inter-stock case portion 13b, the inner end portion of the inner race 40c of the ball bearing 40b that supports the output transmission shaft body 42 is used, but this position is not necessarily required.
The shape of the pressing spring 82 is such that the winding diameter at the end of the working drive shaft 41 on the side that abuts on the spring receiving portion 81b in the axial direction is larger than the winding diameter on the side that abuts on the inner end of the inner race 40c. It is formed in a set truncated cone shape.
The winding diameter of the pressing spring 82 on the side that abuts on the inner end of the inner race 40c is configured to be about the same as or slightly larger than the outer diameter of the externally fitted output transmission shaft body 42. Therefore, the position of the end portion can be positioned by using the inner end portion of the inner race 40c of the ball bearing 40b that supports the output transmission shaft body 42 without requiring special positioning means.

As shown in FIG. 7, the driven side rotating member 81 is operated by the clutch operating member 83 that abuts on the outer peripheral portion to the side away from the driving side rotating member 80 against the urging force of the pressing spring 82. An engaging portion 81c with which the clutch operating member 83 is engaged is provided on the outer peripheral portion. The clutch operating member 83 includes an operating pin 84 that penetrates the upper wall portion of the interstock case portion 13b, and abuts the lower end portion of the operating pin 84 with the engaging portion 81c of the driven side rotating member 81 to contact the operating pin 84. An operation unit 84a for moving the position of the driven side rotating member 81 in the axial direction of the output transmission shaft body 42 is formed in accordance with the rotation operation of the above.

The clutch operating member 83 is a shaft end portion of the operating pin 84 that is exposed to the outside of the interstock case portion 13b among the operating pins 84 that are operated around the rotation axis P1 in the direction intersecting the axis of the work drive shaft 41. An operation plate 85 for rotating the operation pin 84 is attached to the surface. Then, the operation guide member 86 that guides the rotation operation of the operation plate 85 around the rotation axis P1 while supporting the operation plate 85 so as to sandwich it vertically is provided on the outside of the interstock case portion 13b. It is provided in.
As a result, the operation pin 84 is restricted from moving in the direction along the rotation axis P1 by the operation plate 85, and the operation range around the rotation axis p1 is brought into contact with the operation plate 85 and the operation guide member 86. Is regulated by.

The position of the spring receiving portion 81b of the driven side rotating member 81 with respect to the engaging portion of the driven side rotating member 81 with the engaging portion 81c at the lower end of the operation pin 84 is the radius of the driven side rotating member 81. On the inner side in the direction and in the axial direction of the work drive shaft 41, the meshing portion 81a is formed at a portion closer to the facing surface side than the engagement portion of the driven side rotating member 81 with the engaging portion 81c. It is provided. In this way, the spring receiving portion 81b is on the inner side in the radial direction from the engaging portion between the operating pin 84 and the engaging portion 81c of the driven side rotating member 81, and on the side where the meshing portion 81a exists. It has a large recessed shape so that it is close to each other. As a result, it is possible to avoid that the axial length of the work drive shaft 41 of the pressing spring 82 is restricted by the position of the operation pin 84 in the axial direction of the work drive shaft 41, and the interstock case portion 13b can be made compact. Can be planned.

[Fertilization drive system]
From the above-mentioned traveling drive system, the fertilizer application device drive system for branching and transmitting the driving force to the fertilizer application device 9 is configured as follows.
As shown in FIG. 6, on the rear side of the main case portion 13a, a branch case portion 13c formed separately from the main case portion 13a is connected and fixed via a mounting bolt or the like (not shown). ing. The branch case portion 13c includes an input side tubular portion 50A that supports the rear wheel output shaft 64 extending rearward from the main case portion 13a, and a branch transmission shaft extending in a direction intersecting the rear wheel output shaft 64. It is provided with an output-side tubular portion 50B that is fitted onto the 51 and supports the branch transmission shaft 51. The input side tubular portion 50A and the output side tubular portion 50B are formed of an integral body having a common internal space.

A branch output bevel gear (not shown) that transmits power from the rear wheel output shaft 64 to the branch transmission shaft 51 is installed in the input side tubular portion 50A, and a fertilizer bevel gear that meshes with the branch output bevel gear (not shown). Is installed in the output side tubular portion 50B.

The fertilizer application bevel gear is supported so as to be rotatable relative to the branch transmission shaft 51, and the branch transmission shaft 51 and the fertilizer application bevel gear are configured to be detachably engaged with each other via a fertilizer application clutch 9a. The clutch operation shaft body 9b is provided so as to penetrate the output side tubular portion 50B.

[Driving step]
The operation unit step 3 provided in the operation unit C is configured as follows.
The operation unit step 3 shown in FIGS. 1 to 4 is composed of a resin body, and is, for example, a synthetic resin material processed by injection molding. Compared to blow-molded products, injection-molded products have a higher degree of freedom in designing the shape and structure, and are easier to mold with high accuracy. Therefore, select a relatively free shape and structure. It is possible.

As shown in FIGS. 1 to 4, the driver step 3 includes a front step 3A located at the front end of the machine, and a main step 3B located in front of the driver's seat 15 in the front-rear direction of the machine. It is provided with a rear step portion 3C located on the rear side of the driver's seat 15.
The front step portion 3A and the main step portion 3B have substantially flush upper surfaces, but the rear step portion 3C has an upper surface at a position one step higher than the upper surfaces of the front step portion 3A and the main step portion 3B. ..
That is, on the upper surface of the rear step portion 3C, the driver boarded when replenishing the fertilizer tank 90, or the mat-shaped seedlings taken out from the spare seedling stand 16 were placed on the seedling stand 20 of the seedling planting device 2. It is set higher than the upper surfaces of the front step portion 3A and the main step portion 3B so that the driver can rest his / her foot when replenishing.

The front step portion 3A is provided outside the portion where the engine bonnet 19 of the driving portion A exists. That is, the area corresponding to the engine room covered by the engine bonnet 19 is cut out, and the rear side is opened in a plan view so that the front side and the left and right sides of the engine bonnet 19 have upper surfaces on which boarding is possible. The front step portion 3A is formed by the shaped front step plate 30.

The main step portion 3B includes a main step plate 31 located on the front side of the position of the driver's seat 15 in the front-rear direction of the machine body. Further, among the rear step plates 32 described later, the upper surface of the front plate portion 32a located on the front side of the rising portion 3D is also included as a part of the main step portion 3B.
Further, steps 67 for getting on and off the driving unit step 3 are provided at the left and right lateral outer positions of the main step plate 31 from the lateral side.

The main step plate 31 is integrally formed in the left-right direction of the traveling machine body 1. The operation unit step 3 is formed by dispersing a plurality of first protrusions 33 on the step surface 3a. In the main step portion 3B, both side portions 31L and 31R in the left-right direction of the machine body are extended outward from the front step portion 3A.

A second protrusion 34 continuous in a broken line shape is formed on the outer edge of the step surface 3a of the driving unit step 3. The second protrusion 34 also plays a role of restricting the foot hung on the driving unit step 3 from shifting laterally outward from the lateral outer edge of the driving unit step 3.

As shown in FIGS. 3 and 4, in the main step portion 3B, a plurality of groove portions 35 are formed in a grid pattern in the region on the front side of the driver's seat 15, and the first protrusion portion is formed in the region surrounded by the groove portions 35. 33 is formed.

The rear step portion 3C is provided on the rear side of the main step portion 3B and at a position higher than the main step portion 3B with the rising portion 3D interposed therebetween. The rear step portion 3C includes a rear step plate 32.

The rear step plate 32 includes a rising plate portion 32b constituting the rising portion 3D, a front plate portion 32a located on the front side of the rising plate portion 32b, and a rear plate portion located on the rear side of the rising plate portion 32b. It is equipped with 32c. The rear step portion 3C and the rising portion 3D are extended to the rear side of the main step portion 3B so that the width in the left-right direction of the machine body is maintained almost unchanged from the main step portion 3B. That is, the width of the rear step portion 3C in the left-right direction of the machine body is substantially the same as that of the main step portion 3B.

As shown in FIG. 4, a mounting opening 36 for supporting the lower surface side of the driver's seat 15 by a seat fixing portion (not shown) is provided at the center of the rear step plate 32 in the left-right direction of the machine body.
The mounting opening 36 opens an upper notch 36a provided in the rear plate portion 32c so as to open a range overlapping the seat fixing portion in a plan view, and a range overlapping the seat fixing portion in a front-rear direction. As described above, it is composed of a combination with the front notch portion 36b provided in the rising plate portion 32b.

At the boundary between the front step portion 3A and the main step portion 3B, the front step plate 30 and the main step plate 31 are configured to be split back and forth along the front-rear direction dividing line L1.
Further, the main step portion 3B and the rear step portion 3C are also configured to be able to be divided in the front-rear direction by the front-rear direction dividing line L2 at a position deviated from the rising portion 3D in the front-rear direction. In the present embodiment, the main step plate 31 and the rear step plate 32 can be divided in the front-rear direction by the front-rear direction division line L2 on the front side of the rising portion 3D.

The front step plate 30 in the front step portion 3A, the main step plate 31 in the main step portion 3B, and the rear step plate 32 in the rear step portion 3C are each fixed to the machine frame 10 by the step fixing portion 39. ing.
As shown in FIG. 3, a relatively large number of step fixing portions 39 are provided at locations close to the front-rear direction dividing lines L1 and L2 and near the outer peripheral edge.

[Inter-stock speed change operation unit]
As shown in FIG. 9, the inter-stock speed change operation unit 110 is provided in the opening 111 formed in the main step unit 3B of the operation unit step 3. The opening 111 is formed in the front region of the driver's seat 15 in the driver's step 3. An inter-stock speed change lever 77 is operably arranged in the opening 111. In the present embodiment, the inter-stock shift lever 77 is composed of a first shift lever 78 and a second shift lever 79. The main step portion 3B is provided with a lid portion 112 that opens and closes the opening 111.

A plate-shaped operating body 103 (see FIGS. 6 and 7) that operates the first speed change unit 94A of the inter-stock speed change mechanism 94 is linked to the first speed change lever 78 shown in FIGS. 9 and 10. The upper end of the first speed change lever 78 is located in the first guide groove 114 in the left-right direction formed in the frame portion 113 provided in the opening 111. The upper end of the first shift lever 78 can be repositioned in the left-right direction while being guided by the first guide groove 114, and one of two positions, the first shift position and the second shift position, can be selected. Has been done.

The upper end of the second speed change lever 79 that operates the second speed change unit 94B (see FIG. 7) is located in the second guide groove 115 in the front-rear direction formed in the frame part 113. The upper end of the second shift lever 79 can be repositioned in the front-rear direction while being guided by the second guide groove 115, and one of three positions of a low-speed shift position, a medium-speed shift position, and a high-speed shift position can be selected. It is configured to be possible.

The frame unit 113 is provided with a pattern display unit 116 in which a numerical value indicating the inter-stock pitch is described in a region surrounded by the first guide groove 114 and the second guide groove 115. In this way, the pattern display unit 116 is provided below the lid portion 112 and displays information corresponding to the operation positions of the first shift lever 78 and the second shift lever 79. The pattern display unit 116 is provided within the operating range of the first shift lever 78 and the second shift lever 79. The frame portion 113 has a partition portion 113a that separates the first guide groove 114 and the second guide groove 115, and the partition portion 113a is formed over the pattern display portion 116 and the operation portion step 3.

In the pattern display unit 116 shown in FIG. 10, a character pattern of "14" supporting an inter-stock pitch of 14 cm exists in the lower left of the figure. To set the inter-stock pitch 14 cm, the first shift lever 78 should be positioned at the left end of the first guide groove 114, and the second shift lever 79 should be positioned to the left of the frontmost "14" character pattern. Just do it. In this state, since the first shift lever 78 is operated to the high speed side at the first shift position and the second shift lever 79 is also operated to the high speed shift position, the planting device side is driven at the maximum speed and the inter-stock pitch. Is set to the densest 14 cm.

From this state, when the first shift lever 78 is operated toward the right end of the first guide groove 114 and is operated to the front position of the character pattern "16", the first shift lever 78 is switched to the second shift position. It will be in the state of being switched to the low speed side. Therefore, if the position of the second shift lever 79 does not change, the inter-stock pitch is set to 16 cm.
Further, when the position of the second shift lever 79 is positioned on the left side of the character pattern "21" from this state, the inter-stock pitch is set to 21 cm, and when it is positioned on the left side of the character pattern "30", the inter-stock pitch is set. It is set to 30 cm.
When the same operation is performed with the first shift lever 78 positioned at the left end of the first guide groove 114, the position of the second shift lever 79 is located on the right side of the character pattern "18", and the inter-stock pitch. Is set to 18 cm, and when it is positioned on the right side of the character pattern "24", the inter-stock pitch is set to 24 cm.

That is, the shift gear 47 is switched between the first shift position and the second shift position by the movement of the first shift lever 78 in the left-right direction of the machine body, and the character pattern group on the left side and the character pattern group on the right side of the first guide groove 114 are switched. Is selected, and the target character pattern can be selected from each character pattern group by moving the second speed change lever 79 in the front-rear direction of the machine body.
Therefore, it is easy to set the inter-stock pitch according to the operation positions of the first shift lever 78 and the second shift lever 79 in a state where there are few visual erroneous operations.
The first guide groove 114 and the second guide groove 115 provided in the opening 111 are formed by through holes formed in the operation unit step 3 of the traveling machine body 1. The first shift lever 78 and the second shift lever 79 in the guide grooves 114 and 115 are provided so as not to protrude upward from the frame portion 113 of the operation unit step 3, and are usually provided in the operation unit step 3. It is in a state of being covered by the lid portion 112.

When the inter-stock shifting operation unit 110 performs inter-stock shifting, the lid 112 is swung to the rear fulcrum of the machine body to open the opening 111. By doing so, the opening 111 is opened and the first shift lever 78 and the second shift lever 79 arranged in the guide grooves 114 and 115 can be operated.

The lid portion 112 has a plurality of protrusions 117 on the back surface side. When the lid portion 112 is closed with respect to the opening 111 of the main step portion 3B (see FIGS. 3 and 4), the protrusion 117 of the lid portion 112 comes into contact with the frame portion 113, and the frame portion 113 comes into contact with the lid portion 112. Support.

[Clairvoyant floor]
The driver step 3 is provided with a see-through floor portion 52 that can see below the traveling machine body 1. The fluoroscopic floor portion 52 is provided on each of the left and right sides of the front step portion 3A, the main step portion 3B, and the rear step portion 3C. Each of these perspective floor portions 52 is provided at a position closer to the lateral side than the driver's seat 15 in the left-right direction.

That is, the first fluoroscopic floor portion 53 provided in the main step portion 3B is provided at a position where the driver sitting in the driver's seat 15 can easily see the direction of the front wheels 11F and the like.
The second perspective floor portion 54 provided in the rear step portion 3C is provided at a position where the driver seated in the driver's seat 15 can easily see the direction of the rear wheels 11R and the like by looking back.
The third perspective floor portion 55 provided in the front step portion 3A is provided at a position where the driver seated in the driver's seat 15 can visually recognize the front of the aircraft below the front step portion 3A. For example, when turning a headland with a large rice transplanter or the like, it advances to the ridge, then retreats and turns, and at that time, the degree of proximity between the machine body and the ridge can be visually observed through the third perspective floor portion 55.

It is composed of 56 groups of see-through holes arranged radially along the radial direction starting from the perspective floor portion 52, the center of the seat of the driver's seat 15, the existing position of the driver's seat 15, or the position near the driver's seat 15. .. That is, the starting point in the radial direction is based on the position of the driver's line of sight when the driver sitting in the driver's seat 15 is visually observing while in the sitting posture, but since there are some individual differences, the driver's seat There is no problem as long as 15 exists. Further, to some extent, the area around the driver's seat 15 outside the range where the driver's seat 15 exists may be within a range in which the body can be tilted or stood up to look into.

The see-through floor portion 52 is composed of a grid-like member formed by combining a radial crosspiece member 57 along the arrangement direction of the radial through holes 56 groups and an intersecting direction rail member 58 intersecting the radial crosspiece member 57. There is.
Of these, the crossing direction rail member 58 provided in the main step portion 3B and the rear step portion 3C is formed substantially along the front-rear direction of the fuselage, and whether or not the front wheels 11F and the rear wheels 11R are directed in the straight-ahead direction. It also plays a role as an index of.

In this way, the see-through floor 52 is arranged radially along the radial direction starting from the center of the seat of the driver's seat 15, the position where the driver's seat 15 exists, or the position near the driver's seat 15. When configured, the area of the area visible through the see-through floor 52 by the driver who sees from the center of the seat of the driver's seat 15, the existing position of the driver's seat 15, or the position near the driver's seat 15 is expanded as much as possible. It is possible to improve the visibility.
Moreover, among the radial crosspiece members 57 and the crossing direction rail members 58 that form the through hole 56 group of the fluoroscopic floor portion 52, the distance between the adjacent crossing direction rail members 58 is the distance between the adjacent radial direction rail members 57. Is set wider than.
Since the distance between the adjacent crossing direction rail members 58 is set wide in this way, the distance between the adjacent crossing direction rail members 58 is narrower than the distance between the adjacent radial crossing members 57. Alternatively, compared to the case where the settings are set to the same level, there is less risk of narrowing the area of the visible area of the driver who sits on the driver's seat 15 and visually observes the fluoroscopic floor portion 52. Therefore, the visibility of the driver can be further improved.

[1 of another embodiment]
Instead of the inter-stock speed change mechanism 94 shown in FIGS. 7 and 8, the inter-stock speed change mechanism 194 shown in FIGS. 11 and 12 may be adopted. In the following, the inter-stock transmission mechanism 194 (first transmission 194A, second transmission 194B) shown in FIG. 11 is different from the inter-stock transmission mechanism 94 (first transmission 94A, second transmission 94B) shown in FIG. 7. Will be specifically described.

As shown in FIGS. 11 and 12, in the interstock speed change mechanism 194, the intermediate tubular body 44 shown in FIGS. 7 and 8 is omitted, and the rear tubular body 145 is attached to the tubular shaft body 43. .. That is, the intermediate tubular body 44 and the rear tubular body 45 in FIG. 7 correspond to the rear tubular body 145 in FIG. By supporting the tubular shaft body 43 and the rear tubular body 145 by the output transmission shaft body 42, the end portion of the tubular shaft body 43 on the rear tubular body 145 side and the tubular shaft in the rear tubular body 145. The tubular shaft body 43, the rear tubular body 145, and the output transmission shaft body 42 are concentrically supported in a state where the end portion 45a on the body 43 side is in contact with the body 43.

As shown in FIGS. 11 and 12, three driven transmission gears 151, 152, and 153 are supported on the rear tubular body 145 so as to be relatively rotatable.

The driven transmission gear 151 is an eccentric gear in which the center of the driven transmission gear 151 is deviated from the center of the rear tubular body 145, and is in mesh with the transmission gear 131. The driven speed change gears 152 and 153 are constant speed gears in which the centers of the driven speed change gears 152 and 153 coincide with the center of the rear tubular body 145, and are in mesh with the speed change gears 132 and 133.

Male side spline portions 151a and 153a are formed on one and the other of the driven transmission gears 151 and 153, and the female side spline portion 152a is formed on the driven transmission gear 152. The driven gear 152 is between the driven gears 151 and 153 so that the spline portion 152a of the driven gear 152 meshes with the spline portion 151a of the driven gear 151 and the spline portion 153a of the driven gear 153. It is attached to.

The driven transmission gears 151, 152, 153 are connected to each other by spline portions 151a, 152a, 153a, and are attached to the rear tubular body 145 in a state where they can rotate integrally. A spline portion is not formed in a portion of the rear tubular body 145 to which the driven transmission gears 151, 152, and 153 are attached.

The ring-shaped stopper portion 154 that stops the movement of the driven transmission gears 151, 152, and 153 toward the tubular shaft body 43 is formed separately from the rear tubular body 145, and the tubular shape in the rear tubular body 145. It is attached to the end on the shaft body 43 side.
A ring-shaped recess 151b is formed in the driven transmission gear 151 that the stopper portion 154 directly contacts and stops, and the stopper portion 154 is inserted into the recess 151b.

A ring-shaped recess 47d is formed at the end of the shift gear 47 on the rear tubular body 145 side. When the shift gear 47 is slid toward the rear tubular body 145 side to the position where the first tooth portion 47a of the shift gear 47 meshes with the driven side gear 48a, the shift gear 47 (second tooth portion 47b) is moved to the driven transmission gear 151. Approach to a position that is approximately in contact with.

The receiving plate 46a is integrally rotatably attached to the spline portion 153b of the driven transmission gear 153, and is rotatable integrally with the driven transmission gears 151, 152, and 153.

[2 of another embodiment]
In the above embodiment, the configuration in which the lid 112 that closes the opening 111 of the operation unit step 3 can be opened and closed at the rear fulcrum is illustrated, but the lid 112 opens and closes with one side in the front side or the left-right direction as the fulcrum. It may be configured as possible. Further, the lid portion 112 may be configured to be completely removable from the opening 111.
As for other configurations, the same configurations as those in the above-described embodiment may be adopted.

[3 of another embodiment]
In the above embodiment, the inter-stock shift lever 77 is illustrated by being composed of the first shift lever 78 and the second shift lever 79, but the inter-stock shift lever 77 may be composed of one.
As for other configurations, the same configurations as those in the above-described embodiment may be adopted.

[4 of another embodiment]
In the above embodiment, the lid 112 has a plurality of protrusions 117 on the back surface side, but the lid 112 may not have the protrusions 117 on the back surface side.
As for other configurations, the same configurations as those in the above-described embodiment may be adopted.

[5 of another embodiment]
In the above embodiment, the structure in which the fertilizer application device 9 is provided behind the traveling machine 1 is illustrated, but the structure in which the fertilizer application device 9 is not provided may be used.
As for other configurations, the same configurations as those in the above-described embodiment may be adopted.

[6 of another embodiment]
In the above embodiment, as the operation unit step 3, a structure that can be divided in the front-rear direction of the machine body is illustrated, but the present invention is not limited to this, and even if the operation unit step 3 having an indivisible integrated structure is adopted. good.
As for other configurations, the same configurations as those in the above-described embodiment may be adopted.

[7 of another embodiment]
In the above embodiment, the perspective floor portion 52 is provided on both the left and right sides of the front step portion 3A, the main step portion 3B, and the rear step portion 3C, respectively. It is not limited to the structure.
For example, only the front step portion 3A, only the main step portion 3B, or only the rear step portion 3C, or only the front step portion 3A and the main step portion 3B, only the main step portion 3B and the rear step portion 3C, Alternatively, it may be provided only in the front step portion 3A and the rear step portion 3C.
As for other configurations, the same configurations as those in the above-described embodiment may be adopted.

[8 of another embodiment]
In the above embodiment, in the portion where the fluoroscopic floor portion 52 is provided, all the fluoroscopic floor portions 52 are arranged radially along the radial direction starting from the position where the driver's seat 15 exists or the position near the driver's seat 15. An example of a structure composed of 56 groups of holes has been illustrated, but the structure is not necessarily limited to this.
For example, a part of the see-through floor portion 52 may be composed of a group of 56 long-hole-shaped through-holes that are long in the left-right direction of the machine body instead of radially. In this example, the structure in which the long hole-shaped through-holes 56 group is provided on the left side of the rear step plate 32 of the rear step portion 3C is shown, but the same see-through floor portion 52 is also provided on the right side of the rear step plate 32. Is also good.
In particular, in the rear step portion 3C, since the fluoroscopic floor portion 52 is considerably close to the driver's seat 15 in the front-rear direction of the fuselage, the rear wheels are relatively easy even in the long hole-shaped through-hole 56 group long in the left-right direction of the fuselage. It is easy to visually recognize the situation of 11R.

Further, in the front step portion 3A, the positions of the fluoroscopic floor portion 52 and the driver's seat 15 in the front-rear direction are far apart. At this time, the direction of the driver's line of sight in the straight-ahead state while seated in the driver's seat 15 is immediately before the center line CL in the left-right direction of the traveling aircraft 1. The angle formed by the virtual line segment connecting the position of the driver's seat 15 and the location of the fluoroscopic floor portion 52 in the front step portion 3A and the center line CL is relatively small, and the direction of the driver's line of sight in a straight line state. Not so much off from.
Therefore, in the front step portion 3A, even if the fluoroscopic floor portion 52 is composed of the long hole-shaped through holes 56 groups long in the front-rear direction of the traveling machine body 1 along the front-rear direction, the head is slightly laterally moved. By doing so, the situation of the front wheels 11F can be visually recognized relatively easily.
In this way, depending on the position on the operation unit step 3 where the fluoroscopic floor portion 52 is provided, the arrangement status of the through-holes 56 of the fluoroscopic floor portion 52 is not limited to the group of through-holes 56 arranged radially, but different forms of through-holes. It may be configured in combination with 56 groups.
As for other configurations, the same configurations as those in the above-described embodiment may be adopted.

The present invention is not limited to a riding type rice transplanter provided with a seedling planting device 2 having a four-row planting specification as shown in the embodiment, but a riding type provided with a seedling planting device 2 having a different number of planting rows. It can be applied to various rice transplanters such as rice transplanters, direct sowing machines for sowing seeds in fields, and chemical sprayers.

1: Traveling machine 2: Seedling planting device 3: Driving unit step 3A: Front step unit 3B: Main step unit 3C: Rear step unit 4: Fertilizer application device 8: Planting clutch 9: Fertilizer application device 10: Machine frame 11F: Front Wheel 11R: Rear wheel 12: Engine 13: Mission case 13a: Main case 13b: Inter-stock case 13c: Branch case 15: Driver's seat 20: Seedling stand 21: Feed case 22: Planting drive case 23: Seedling Attached mechanism 23a: Planting claw 52: Perspective floor 77: Inter-stock speed change lever 78: First speed change lever 79: Second speed change lever 94, 194: Inter-stock speed change mechanism 94A, 194A: First speed change part 94B, 194B: Second Speed change unit 110: Inter-stock speed change operation unit 111: Opening 112: Lid part 113: Frame part 114: First guide groove 115: Second guide groove 116: Pattern display part 117: Projection part A: Driving part C: Driving part

Claims (8)

A seedling planting mechanism in which the tip of the planting claw is driven to reciprocate and move vertically between the seedling stand and the rice field surface in a circular rotation trajectory.
An inter-strain transmission mechanism provided in a power transmission unit that transmits power from the engine to the seedling planting mechanism and shifts the driving speed of the seedling planting mechanism with respect to the traveling speed.
An inter-stock speed change lever that operates the inter-stock speed change mechanism,
With the driver's seat
A driver step provided on the side and front of the driver's seat is provided.
In the driver step, an opening is formed in the front region of the driver seat.
The inter-stock speed change lever is arranged so as to be operable from the opening.
A paddy field working machine provided with a lid that closes the opening and becomes a part of the driving step. The paddy field working machine according to claim 1, wherein the driving unit step is composed of a resin body integrally formed in the left-right direction of the machine body. The paddy field working machine according to claim 1 or 2, wherein the lid portion is configured so that the opening can be opened and closed at a fulcrum on the rear side of the machine body. The interstock speed change lever includes a first speed change lever that can be operated in the left-right direction of the machine body and a second speed change lever that can be operated in the front-rear direction of the machine body.
The paddy field working machine according to any one of claims 1 to 3, which performs inter-stock shifting based on the operating positions of the first shifting lever and the second shifting lever. The paddy field working machine according to claim 4, wherein a pattern display unit for displaying information corresponding to the operating positions of the first shift lever and the second shift lever is provided below the lid portion. The paddy field working machine according to claim 5, wherein the pattern display unit is provided within the operating range of the first shift lever and the second shift lever. The lid portion has a plurality of protrusions on the back surface side, and has a plurality of protrusions.
Any one of claims 1 to 6 is provided with a guide groove of the inter-stock speed change lever and a frame portion that abuts on the protrusion and supports the closed lid portion in the opening. Paddy field work machine described in. The opening is provided with a first guide groove of the first shift lever, a second guide groove of the second shift lever, and a frame portion for supporting the closed lid portion.
The frame portion has a partition portion that separates the first guide groove and the second guide groove.
The paddy field working machine according to claim 5 or 6, wherein the partition portion is formed over the pattern display unit and the operation unit step.

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